[331] | 1 | /*
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| 2 | * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include "internal/cryptlib.h"
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| 11 | #include <openssl/asn1t.h>
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| 12 | #include <openssl/pem.h>
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| 13 | #include <openssl/x509v3.h>
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| 14 | #include <openssl/err.h>
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| 15 | #include <openssl/cms.h>
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| 16 | #include <openssl/aes.h>
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| 17 | #include "cms_lcl.h"
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| 18 | #include "internal/asn1_int.h"
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| 19 | #include "internal/evp_int.h"
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| 20 |
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| 21 | /* CMS EnvelopedData Utilities */
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| 22 |
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| 23 | CMS_EnvelopedData *cms_get0_enveloped(CMS_ContentInfo *cms)
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| 24 | {
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| 25 | if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_enveloped) {
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| 26 | CMSerr(CMS_F_CMS_GET0_ENVELOPED,
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| 27 | CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA);
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| 28 | return NULL;
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| 29 | }
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| 30 | return cms->d.envelopedData;
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| 31 | }
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| 32 |
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| 33 | static CMS_EnvelopedData *cms_enveloped_data_init(CMS_ContentInfo *cms)
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| 34 | {
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| 35 | if (cms->d.other == NULL) {
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| 36 | cms->d.envelopedData = M_ASN1_new_of(CMS_EnvelopedData);
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| 37 | if (!cms->d.envelopedData) {
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| 38 | CMSerr(CMS_F_CMS_ENVELOPED_DATA_INIT, ERR_R_MALLOC_FAILURE);
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| 39 | return NULL;
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| 40 | }
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| 41 | cms->d.envelopedData->version = 0;
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| 42 | cms->d.envelopedData->encryptedContentInfo->contentType =
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| 43 | OBJ_nid2obj(NID_pkcs7_data);
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| 44 | ASN1_OBJECT_free(cms->contentType);
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| 45 | cms->contentType = OBJ_nid2obj(NID_pkcs7_enveloped);
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| 46 | return cms->d.envelopedData;
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| 47 | }
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| 48 | return cms_get0_enveloped(cms);
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| 49 | }
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| 50 |
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| 51 | int cms_env_asn1_ctrl(CMS_RecipientInfo *ri, int cmd)
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| 52 | {
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| 53 | EVP_PKEY *pkey;
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| 54 | int i;
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| 55 | if (ri->type == CMS_RECIPINFO_TRANS)
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| 56 | pkey = ri->d.ktri->pkey;
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| 57 | else if (ri->type == CMS_RECIPINFO_AGREE) {
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| 58 | EVP_PKEY_CTX *pctx = ri->d.kari->pctx;
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| 59 | if (!pctx)
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| 60 | return 0;
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| 61 | pkey = EVP_PKEY_CTX_get0_pkey(pctx);
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| 62 | if (!pkey)
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| 63 | return 0;
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| 64 | } else
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| 65 | return 0;
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| 66 | if (!pkey->ameth || !pkey->ameth->pkey_ctrl)
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| 67 | return 1;
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| 68 | i = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_CMS_ENVELOPE, cmd, ri);
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| 69 | if (i == -2) {
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| 70 | CMSerr(CMS_F_CMS_ENV_ASN1_CTRL,
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| 71 | CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
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| 72 | return 0;
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| 73 | }
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| 74 | if (i <= 0) {
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| 75 | CMSerr(CMS_F_CMS_ENV_ASN1_CTRL, CMS_R_CTRL_FAILURE);
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| 76 | return 0;
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| 77 | }
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| 78 | return 1;
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| 79 | }
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| 80 |
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| 81 | STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
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| 82 | {
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| 83 | CMS_EnvelopedData *env;
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| 84 | env = cms_get0_enveloped(cms);
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| 85 | if (!env)
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| 86 | return NULL;
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| 87 | return env->recipientInfos;
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| 88 | }
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| 89 |
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| 90 | int CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
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| 91 | {
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| 92 | return ri->type;
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| 93 | }
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| 94 |
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| 95 | EVP_PKEY_CTX *CMS_RecipientInfo_get0_pkey_ctx(CMS_RecipientInfo *ri)
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| 96 | {
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| 97 | if (ri->type == CMS_RECIPINFO_TRANS)
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| 98 | return ri->d.ktri->pctx;
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| 99 | else if (ri->type == CMS_RECIPINFO_AGREE)
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| 100 | return ri->d.kari->pctx;
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| 101 | return NULL;
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| 102 | }
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| 103 |
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| 104 | CMS_ContentInfo *CMS_EnvelopedData_create(const EVP_CIPHER *cipher)
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| 105 | {
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| 106 | CMS_ContentInfo *cms;
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| 107 | CMS_EnvelopedData *env;
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| 108 | cms = CMS_ContentInfo_new();
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| 109 | if (cms == NULL)
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| 110 | goto merr;
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| 111 | env = cms_enveloped_data_init(cms);
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| 112 | if (env == NULL)
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| 113 | goto merr;
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| 114 | if (!cms_EncryptedContent_init(env->encryptedContentInfo,
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| 115 | cipher, NULL, 0))
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| 116 | goto merr;
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| 117 | return cms;
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| 118 | merr:
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| 119 | CMS_ContentInfo_free(cms);
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| 120 | CMSerr(CMS_F_CMS_ENVELOPEDDATA_CREATE, ERR_R_MALLOC_FAILURE);
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| 121 | return NULL;
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| 122 | }
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| 123 |
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| 124 | /* Key Transport Recipient Info (KTRI) routines */
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| 125 |
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| 126 | /* Initialise a ktri based on passed certificate and key */
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| 127 |
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| 128 | static int cms_RecipientInfo_ktri_init(CMS_RecipientInfo *ri, X509 *recip,
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| 129 | EVP_PKEY *pk, unsigned int flags)
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| 130 | {
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| 131 | CMS_KeyTransRecipientInfo *ktri;
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| 132 | int idtype;
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| 133 |
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| 134 | ri->d.ktri = M_ASN1_new_of(CMS_KeyTransRecipientInfo);
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| 135 | if (!ri->d.ktri)
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| 136 | return 0;
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| 137 | ri->type = CMS_RECIPINFO_TRANS;
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| 138 |
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| 139 | ktri = ri->d.ktri;
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| 140 |
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| 141 | if (flags & CMS_USE_KEYID) {
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| 142 | ktri->version = 2;
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| 143 | idtype = CMS_RECIPINFO_KEYIDENTIFIER;
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| 144 | } else {
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| 145 | ktri->version = 0;
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| 146 | idtype = CMS_RECIPINFO_ISSUER_SERIAL;
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| 147 | }
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| 148 |
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| 149 | /*
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| 150 | * Not a typo: RecipientIdentifier and SignerIdentifier are the same
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| 151 | * structure.
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| 152 | */
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| 153 |
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| 154 | if (!cms_set1_SignerIdentifier(ktri->rid, recip, idtype))
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| 155 | return 0;
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| 156 |
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| 157 | X509_up_ref(recip);
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| 158 | EVP_PKEY_up_ref(pk);
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| 159 |
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| 160 | ktri->pkey = pk;
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| 161 | ktri->recip = recip;
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| 162 |
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| 163 | if (flags & CMS_KEY_PARAM) {
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| 164 | ktri->pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
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| 165 | if (ktri->pctx == NULL)
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| 166 | return 0;
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| 167 | if (EVP_PKEY_encrypt_init(ktri->pctx) <= 0)
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| 168 | return 0;
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| 169 | } else if (!cms_env_asn1_ctrl(ri, 0))
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| 170 | return 0;
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| 171 | return 1;
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| 172 | }
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| 173 |
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| 174 | /*
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| 175 | * Add a recipient certificate using appropriate type of RecipientInfo
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| 176 | */
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| 177 |
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| 178 | CMS_RecipientInfo *CMS_add1_recipient_cert(CMS_ContentInfo *cms,
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| 179 | X509 *recip, unsigned int flags)
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| 180 | {
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| 181 | CMS_RecipientInfo *ri = NULL;
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| 182 | CMS_EnvelopedData *env;
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| 183 | EVP_PKEY *pk = NULL;
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| 184 | env = cms_get0_enveloped(cms);
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| 185 | if (!env)
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| 186 | goto err;
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| 187 |
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| 188 | /* Initialize recipient info */
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| 189 | ri = M_ASN1_new_of(CMS_RecipientInfo);
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| 190 | if (!ri)
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| 191 | goto merr;
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| 192 |
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| 193 | pk = X509_get0_pubkey(recip);
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| 194 | if (!pk) {
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| 195 | CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, CMS_R_ERROR_GETTING_PUBLIC_KEY);
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| 196 | goto err;
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| 197 | }
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| 198 |
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| 199 | switch (cms_pkey_get_ri_type(pk)) {
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| 200 |
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| 201 | case CMS_RECIPINFO_TRANS:
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| 202 | if (!cms_RecipientInfo_ktri_init(ri, recip, pk, flags))
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| 203 | goto err;
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| 204 | break;
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| 205 |
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| 206 | case CMS_RECIPINFO_AGREE:
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| 207 | if (!cms_RecipientInfo_kari_init(ri, recip, pk, flags))
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| 208 | goto err;
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| 209 | break;
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| 210 |
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| 211 | default:
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| 212 | CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT,
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| 213 | CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
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| 214 | goto err;
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| 215 |
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| 216 | }
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| 217 |
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| 218 | if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
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| 219 | goto merr;
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| 220 |
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| 221 | return ri;
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| 222 |
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| 223 | merr:
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| 224 | CMSerr(CMS_F_CMS_ADD1_RECIPIENT_CERT, ERR_R_MALLOC_FAILURE);
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| 225 | err:
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| 226 | M_ASN1_free_of(ri, CMS_RecipientInfo);
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| 227 | return NULL;
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| 228 |
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| 229 | }
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| 230 |
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| 231 | int CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri,
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| 232 | EVP_PKEY **pk, X509 **recip,
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| 233 | X509_ALGOR **palg)
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| 234 | {
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| 235 | CMS_KeyTransRecipientInfo *ktri;
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| 236 | if (ri->type != CMS_RECIPINFO_TRANS) {
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| 237 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS,
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| 238 | CMS_R_NOT_KEY_TRANSPORT);
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| 239 | return 0;
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| 240 | }
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| 241 |
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| 242 | ktri = ri->d.ktri;
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| 243 |
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| 244 | if (pk)
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| 245 | *pk = ktri->pkey;
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| 246 | if (recip)
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| 247 | *recip = ktri->recip;
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| 248 | if (palg)
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| 249 | *palg = ktri->keyEncryptionAlgorithm;
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| 250 | return 1;
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| 251 | }
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| 252 |
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| 253 | int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
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| 254 | ASN1_OCTET_STRING **keyid,
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| 255 | X509_NAME **issuer,
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| 256 | ASN1_INTEGER **sno)
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| 257 | {
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| 258 | CMS_KeyTransRecipientInfo *ktri;
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| 259 | if (ri->type != CMS_RECIPINFO_TRANS) {
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| 260 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID,
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| 261 | CMS_R_NOT_KEY_TRANSPORT);
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| 262 | return 0;
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| 263 | }
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| 264 | ktri = ri->d.ktri;
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| 265 |
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| 266 | return cms_SignerIdentifier_get0_signer_id(ktri->rid, keyid, issuer, sno);
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| 267 | }
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| 268 |
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| 269 | int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert)
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| 270 | {
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| 271 | if (ri->type != CMS_RECIPINFO_TRANS) {
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| 272 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP,
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| 273 | CMS_R_NOT_KEY_TRANSPORT);
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| 274 | return -2;
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| 275 | }
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| 276 | return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
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| 277 | }
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| 278 |
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| 279 | int CMS_RecipientInfo_set0_pkey(CMS_RecipientInfo *ri, EVP_PKEY *pkey)
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| 280 | {
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| 281 | if (ri->type != CMS_RECIPINFO_TRANS) {
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| 282 | CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_PKEY, CMS_R_NOT_KEY_TRANSPORT);
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| 283 | return 0;
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| 284 | }
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| 285 | ri->d.ktri->pkey = pkey;
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| 286 | return 1;
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| 287 | }
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| 288 |
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| 289 | /* Encrypt content key in key transport recipient info */
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| 290 |
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| 291 | static int cms_RecipientInfo_ktri_encrypt(CMS_ContentInfo *cms,
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| 292 | CMS_RecipientInfo *ri)
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| 293 | {
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| 294 | CMS_KeyTransRecipientInfo *ktri;
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| 295 | CMS_EncryptedContentInfo *ec;
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| 296 | EVP_PKEY_CTX *pctx;
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| 297 | unsigned char *ek = NULL;
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| 298 | size_t eklen;
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| 299 |
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| 300 | int ret = 0;
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| 301 |
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| 302 | if (ri->type != CMS_RECIPINFO_TRANS) {
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| 303 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_NOT_KEY_TRANSPORT);
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| 304 | return 0;
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| 305 | }
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| 306 | ktri = ri->d.ktri;
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| 307 | ec = cms->d.envelopedData->encryptedContentInfo;
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| 308 |
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| 309 | pctx = ktri->pctx;
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| 310 |
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| 311 | if (pctx) {
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| 312 | if (!cms_env_asn1_ctrl(ri, 0))
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| 313 | goto err;
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| 314 | } else {
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| 315 | pctx = EVP_PKEY_CTX_new(ktri->pkey, NULL);
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| 316 | if (pctx == NULL)
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| 317 | return 0;
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| 318 |
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| 319 | if (EVP_PKEY_encrypt_init(pctx) <= 0)
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| 320 | goto err;
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| 321 | }
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| 322 |
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| 323 | if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_ENCRYPT,
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| 324 | EVP_PKEY_CTRL_CMS_ENCRYPT, 0, ri) <= 0) {
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| 325 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, CMS_R_CTRL_ERROR);
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| 326 | goto err;
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| 327 | }
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| 328 |
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| 329 | if (EVP_PKEY_encrypt(pctx, NULL, &eklen, ec->key, ec->keylen) <= 0)
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| 330 | goto err;
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| 331 |
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| 332 | ek = OPENSSL_malloc(eklen);
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| 333 |
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| 334 | if (ek == NULL) {
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| 335 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
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| 336 | goto err;
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| 337 | }
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| 338 |
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| 339 | if (EVP_PKEY_encrypt(pctx, ek, &eklen, ec->key, ec->keylen) <= 0)
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| 340 | goto err;
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| 341 |
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| 342 | ASN1_STRING_set0(ktri->encryptedKey, ek, eklen);
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| 343 | ek = NULL;
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| 344 |
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| 345 | ret = 1;
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| 346 |
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| 347 | err:
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| 348 | EVP_PKEY_CTX_free(pctx);
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| 349 | ktri->pctx = NULL;
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| 350 | OPENSSL_free(ek);
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| 351 | return ret;
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| 352 |
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| 353 | }
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| 354 |
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| 355 | /* Decrypt content key from KTRI */
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| 356 |
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| 357 | static int cms_RecipientInfo_ktri_decrypt(CMS_ContentInfo *cms,
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| 358 | CMS_RecipientInfo *ri)
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| 359 | {
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| 360 | CMS_KeyTransRecipientInfo *ktri = ri->d.ktri;
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| 361 | EVP_PKEY *pkey = ktri->pkey;
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| 362 | unsigned char *ek = NULL;
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| 363 | size_t eklen;
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| 364 | int ret = 0;
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| 365 | CMS_EncryptedContentInfo *ec;
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| 366 | ec = cms->d.envelopedData->encryptedContentInfo;
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| 367 |
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| 368 | if (ktri->pkey == NULL) {
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| 369 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_NO_PRIVATE_KEY);
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| 370 | return 0;
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| 371 | }
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| 372 |
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| 373 | ktri->pctx = EVP_PKEY_CTX_new(pkey, NULL);
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| 374 | if (ktri->pctx == NULL)
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| 375 | return 0;
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| 376 |
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| 377 | if (EVP_PKEY_decrypt_init(ktri->pctx) <= 0)
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| 378 | goto err;
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| 379 |
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| 380 | if (!cms_env_asn1_ctrl(ri, 1))
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| 381 | goto err;
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| 382 |
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| 383 | if (EVP_PKEY_CTX_ctrl(ktri->pctx, -1, EVP_PKEY_OP_DECRYPT,
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| 384 | EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0) {
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| 385 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CTRL_ERROR);
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| 386 | goto err;
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| 387 | }
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| 388 |
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| 389 | if (EVP_PKEY_decrypt(ktri->pctx, NULL, &eklen,
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| 390 | ktri->encryptedKey->data,
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| 391 | ktri->encryptedKey->length) <= 0)
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| 392 | goto err;
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| 393 |
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| 394 | ek = OPENSSL_malloc(eklen);
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| 395 |
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| 396 | if (ek == NULL) {
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| 397 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, ERR_R_MALLOC_FAILURE);
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| 398 | goto err;
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| 399 | }
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| 400 |
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| 401 | if (EVP_PKEY_decrypt(ktri->pctx, ek, &eklen,
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| 402 | ktri->encryptedKey->data,
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| 403 | ktri->encryptedKey->length) <= 0) {
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| 404 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_DECRYPT, CMS_R_CMS_LIB);
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| 405 | goto err;
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| 406 | }
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| 407 |
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| 408 | ret = 1;
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| 409 |
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| 410 | OPENSSL_clear_free(ec->key, ec->keylen);
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| 411 | ec->key = ek;
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| 412 | ec->keylen = eklen;
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| 413 |
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| 414 | err:
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| 415 | EVP_PKEY_CTX_free(ktri->pctx);
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| 416 | ktri->pctx = NULL;
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| 417 | if (!ret)
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| 418 | OPENSSL_free(ek);
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| 419 |
|
---|
| 420 | return ret;
|
---|
| 421 | }
|
---|
| 422 |
|
---|
| 423 | /* Key Encrypted Key (KEK) RecipientInfo routines */
|
---|
| 424 |
|
---|
| 425 | int CMS_RecipientInfo_kekri_id_cmp(CMS_RecipientInfo *ri,
|
---|
| 426 | const unsigned char *id, size_t idlen)
|
---|
| 427 | {
|
---|
| 428 | ASN1_OCTET_STRING tmp_os;
|
---|
| 429 | CMS_KEKRecipientInfo *kekri;
|
---|
| 430 | if (ri->type != CMS_RECIPINFO_KEK) {
|
---|
| 431 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ID_CMP, CMS_R_NOT_KEK);
|
---|
| 432 | return -2;
|
---|
| 433 | }
|
---|
| 434 | kekri = ri->d.kekri;
|
---|
| 435 | tmp_os.type = V_ASN1_OCTET_STRING;
|
---|
| 436 | tmp_os.flags = 0;
|
---|
| 437 | tmp_os.data = (unsigned char *)id;
|
---|
| 438 | tmp_os.length = (int)idlen;
|
---|
| 439 | return ASN1_OCTET_STRING_cmp(&tmp_os, kekri->kekid->keyIdentifier);
|
---|
| 440 | }
|
---|
| 441 |
|
---|
| 442 | /* For now hard code AES key wrap info */
|
---|
| 443 |
|
---|
| 444 | static size_t aes_wrap_keylen(int nid)
|
---|
| 445 | {
|
---|
| 446 | switch (nid) {
|
---|
| 447 | case NID_id_aes128_wrap:
|
---|
| 448 | return 16;
|
---|
| 449 |
|
---|
| 450 | case NID_id_aes192_wrap:
|
---|
| 451 | return 24;
|
---|
| 452 |
|
---|
| 453 | case NID_id_aes256_wrap:
|
---|
| 454 | return 32;
|
---|
| 455 |
|
---|
| 456 | default:
|
---|
| 457 | return 0;
|
---|
| 458 | }
|
---|
| 459 | }
|
---|
| 460 |
|
---|
| 461 | CMS_RecipientInfo *CMS_add0_recipient_key(CMS_ContentInfo *cms, int nid,
|
---|
| 462 | unsigned char *key, size_t keylen,
|
---|
| 463 | unsigned char *id, size_t idlen,
|
---|
| 464 | ASN1_GENERALIZEDTIME *date,
|
---|
| 465 | ASN1_OBJECT *otherTypeId,
|
---|
| 466 | ASN1_TYPE *otherType)
|
---|
| 467 | {
|
---|
| 468 | CMS_RecipientInfo *ri = NULL;
|
---|
| 469 | CMS_EnvelopedData *env;
|
---|
| 470 | CMS_KEKRecipientInfo *kekri;
|
---|
| 471 | env = cms_get0_enveloped(cms);
|
---|
| 472 | if (!env)
|
---|
| 473 | goto err;
|
---|
| 474 |
|
---|
| 475 | if (nid == NID_undef) {
|
---|
| 476 | switch (keylen) {
|
---|
| 477 | case 16:
|
---|
| 478 | nid = NID_id_aes128_wrap;
|
---|
| 479 | break;
|
---|
| 480 |
|
---|
| 481 | case 24:
|
---|
| 482 | nid = NID_id_aes192_wrap;
|
---|
| 483 | break;
|
---|
| 484 |
|
---|
| 485 | case 32:
|
---|
| 486 | nid = NID_id_aes256_wrap;
|
---|
| 487 | break;
|
---|
| 488 |
|
---|
| 489 | default:
|
---|
| 490 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
|
---|
| 491 | goto err;
|
---|
| 492 | }
|
---|
| 493 |
|
---|
| 494 | } else {
|
---|
| 495 |
|
---|
| 496 | size_t exp_keylen = aes_wrap_keylen(nid);
|
---|
| 497 |
|
---|
| 498 | if (!exp_keylen) {
|
---|
| 499 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY,
|
---|
| 500 | CMS_R_UNSUPPORTED_KEK_ALGORITHM);
|
---|
| 501 | goto err;
|
---|
| 502 | }
|
---|
| 503 |
|
---|
| 504 | if (keylen != exp_keylen) {
|
---|
| 505 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, CMS_R_INVALID_KEY_LENGTH);
|
---|
| 506 | goto err;
|
---|
| 507 | }
|
---|
| 508 |
|
---|
| 509 | }
|
---|
| 510 |
|
---|
| 511 | /* Initialize recipient info */
|
---|
| 512 | ri = M_ASN1_new_of(CMS_RecipientInfo);
|
---|
| 513 | if (!ri)
|
---|
| 514 | goto merr;
|
---|
| 515 |
|
---|
| 516 | ri->d.kekri = M_ASN1_new_of(CMS_KEKRecipientInfo);
|
---|
| 517 | if (!ri->d.kekri)
|
---|
| 518 | goto merr;
|
---|
| 519 | ri->type = CMS_RECIPINFO_KEK;
|
---|
| 520 |
|
---|
| 521 | kekri = ri->d.kekri;
|
---|
| 522 |
|
---|
| 523 | if (otherTypeId) {
|
---|
| 524 | kekri->kekid->other = M_ASN1_new_of(CMS_OtherKeyAttribute);
|
---|
| 525 | if (kekri->kekid->other == NULL)
|
---|
| 526 | goto merr;
|
---|
| 527 | }
|
---|
| 528 |
|
---|
| 529 | if (!sk_CMS_RecipientInfo_push(env->recipientInfos, ri))
|
---|
| 530 | goto merr;
|
---|
| 531 |
|
---|
| 532 | /* After this point no calls can fail */
|
---|
| 533 |
|
---|
| 534 | kekri->version = 4;
|
---|
| 535 |
|
---|
| 536 | kekri->key = key;
|
---|
| 537 | kekri->keylen = keylen;
|
---|
| 538 |
|
---|
| 539 | ASN1_STRING_set0(kekri->kekid->keyIdentifier, id, idlen);
|
---|
| 540 |
|
---|
| 541 | kekri->kekid->date = date;
|
---|
| 542 |
|
---|
| 543 | if (kekri->kekid->other) {
|
---|
| 544 | kekri->kekid->other->keyAttrId = otherTypeId;
|
---|
| 545 | kekri->kekid->other->keyAttr = otherType;
|
---|
| 546 | }
|
---|
| 547 |
|
---|
| 548 | X509_ALGOR_set0(kekri->keyEncryptionAlgorithm,
|
---|
| 549 | OBJ_nid2obj(nid), V_ASN1_UNDEF, NULL);
|
---|
| 550 |
|
---|
| 551 | return ri;
|
---|
| 552 |
|
---|
| 553 | merr:
|
---|
| 554 | CMSerr(CMS_F_CMS_ADD0_RECIPIENT_KEY, ERR_R_MALLOC_FAILURE);
|
---|
| 555 | err:
|
---|
| 556 | M_ASN1_free_of(ri, CMS_RecipientInfo);
|
---|
| 557 | return NULL;
|
---|
| 558 |
|
---|
| 559 | }
|
---|
| 560 |
|
---|
| 561 | int CMS_RecipientInfo_kekri_get0_id(CMS_RecipientInfo *ri,
|
---|
| 562 | X509_ALGOR **palg,
|
---|
| 563 | ASN1_OCTET_STRING **pid,
|
---|
| 564 | ASN1_GENERALIZEDTIME **pdate,
|
---|
| 565 | ASN1_OBJECT **potherid,
|
---|
| 566 | ASN1_TYPE **pothertype)
|
---|
| 567 | {
|
---|
| 568 | CMS_KEKIdentifier *rkid;
|
---|
| 569 | if (ri->type != CMS_RECIPINFO_KEK) {
|
---|
| 570 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_GET0_ID, CMS_R_NOT_KEK);
|
---|
| 571 | return 0;
|
---|
| 572 | }
|
---|
| 573 | rkid = ri->d.kekri->kekid;
|
---|
| 574 | if (palg)
|
---|
| 575 | *palg = ri->d.kekri->keyEncryptionAlgorithm;
|
---|
| 576 | if (pid)
|
---|
| 577 | *pid = rkid->keyIdentifier;
|
---|
| 578 | if (pdate)
|
---|
| 579 | *pdate = rkid->date;
|
---|
| 580 | if (potherid) {
|
---|
| 581 | if (rkid->other)
|
---|
| 582 | *potherid = rkid->other->keyAttrId;
|
---|
| 583 | else
|
---|
| 584 | *potherid = NULL;
|
---|
| 585 | }
|
---|
| 586 | if (pothertype) {
|
---|
| 587 | if (rkid->other)
|
---|
| 588 | *pothertype = rkid->other->keyAttr;
|
---|
| 589 | else
|
---|
| 590 | *pothertype = NULL;
|
---|
| 591 | }
|
---|
| 592 | return 1;
|
---|
| 593 | }
|
---|
| 594 |
|
---|
| 595 | int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
|
---|
| 596 | unsigned char *key, size_t keylen)
|
---|
| 597 | {
|
---|
| 598 | CMS_KEKRecipientInfo *kekri;
|
---|
| 599 | if (ri->type != CMS_RECIPINFO_KEK) {
|
---|
| 600 | CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK);
|
---|
| 601 | return 0;
|
---|
| 602 | }
|
---|
| 603 |
|
---|
| 604 | kekri = ri->d.kekri;
|
---|
| 605 | kekri->key = key;
|
---|
| 606 | kekri->keylen = keylen;
|
---|
| 607 | return 1;
|
---|
| 608 | }
|
---|
| 609 |
|
---|
| 610 | /* Encrypt content key in KEK recipient info */
|
---|
| 611 |
|
---|
| 612 | static int cms_RecipientInfo_kekri_encrypt(CMS_ContentInfo *cms,
|
---|
| 613 | CMS_RecipientInfo *ri)
|
---|
| 614 | {
|
---|
| 615 | CMS_EncryptedContentInfo *ec;
|
---|
| 616 | CMS_KEKRecipientInfo *kekri;
|
---|
| 617 | AES_KEY actx;
|
---|
| 618 | unsigned char *wkey = NULL;
|
---|
| 619 | int wkeylen;
|
---|
| 620 | int r = 0;
|
---|
| 621 |
|
---|
| 622 | ec = cms->d.envelopedData->encryptedContentInfo;
|
---|
| 623 |
|
---|
| 624 | kekri = ri->d.kekri;
|
---|
| 625 |
|
---|
| 626 | if (!kekri->key) {
|
---|
| 627 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_NO_KEY);
|
---|
| 628 | return 0;
|
---|
| 629 | }
|
---|
| 630 |
|
---|
| 631 | if (AES_set_encrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
|
---|
| 632 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT,
|
---|
| 633 | CMS_R_ERROR_SETTING_KEY);
|
---|
| 634 | goto err;
|
---|
| 635 | }
|
---|
| 636 |
|
---|
| 637 | wkey = OPENSSL_malloc(ec->keylen + 8);
|
---|
| 638 |
|
---|
| 639 | if (wkey == NULL) {
|
---|
| 640 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, ERR_R_MALLOC_FAILURE);
|
---|
| 641 | goto err;
|
---|
| 642 | }
|
---|
| 643 |
|
---|
| 644 | wkeylen = AES_wrap_key(&actx, NULL, wkey, ec->key, ec->keylen);
|
---|
| 645 |
|
---|
| 646 | if (wkeylen <= 0) {
|
---|
| 647 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_ENCRYPT, CMS_R_WRAP_ERROR);
|
---|
| 648 | goto err;
|
---|
| 649 | }
|
---|
| 650 |
|
---|
| 651 | ASN1_STRING_set0(kekri->encryptedKey, wkey, wkeylen);
|
---|
| 652 |
|
---|
| 653 | r = 1;
|
---|
| 654 |
|
---|
| 655 | err:
|
---|
| 656 |
|
---|
| 657 | if (!r)
|
---|
| 658 | OPENSSL_free(wkey);
|
---|
| 659 | OPENSSL_cleanse(&actx, sizeof(actx));
|
---|
| 660 |
|
---|
| 661 | return r;
|
---|
| 662 |
|
---|
| 663 | }
|
---|
| 664 |
|
---|
| 665 | /* Decrypt content key in KEK recipient info */
|
---|
| 666 |
|
---|
| 667 | static int cms_RecipientInfo_kekri_decrypt(CMS_ContentInfo *cms,
|
---|
| 668 | CMS_RecipientInfo *ri)
|
---|
| 669 | {
|
---|
| 670 | CMS_EncryptedContentInfo *ec;
|
---|
| 671 | CMS_KEKRecipientInfo *kekri;
|
---|
| 672 | AES_KEY actx;
|
---|
| 673 | unsigned char *ukey = NULL;
|
---|
| 674 | int ukeylen;
|
---|
| 675 | int r = 0, wrap_nid;
|
---|
| 676 |
|
---|
| 677 | ec = cms->d.envelopedData->encryptedContentInfo;
|
---|
| 678 |
|
---|
| 679 | kekri = ri->d.kekri;
|
---|
| 680 |
|
---|
| 681 | if (!kekri->key) {
|
---|
| 682 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_NO_KEY);
|
---|
| 683 | return 0;
|
---|
| 684 | }
|
---|
| 685 |
|
---|
| 686 | wrap_nid = OBJ_obj2nid(kekri->keyEncryptionAlgorithm->algorithm);
|
---|
| 687 | if (aes_wrap_keylen(wrap_nid) != kekri->keylen) {
|
---|
| 688 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
|
---|
| 689 | CMS_R_INVALID_KEY_LENGTH);
|
---|
| 690 | return 0;
|
---|
| 691 | }
|
---|
| 692 |
|
---|
| 693 | /* If encrypted key length is invalid don't bother */
|
---|
| 694 |
|
---|
| 695 | if (kekri->encryptedKey->length < 16) {
|
---|
| 696 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
|
---|
| 697 | CMS_R_INVALID_ENCRYPTED_KEY_LENGTH);
|
---|
| 698 | goto err;
|
---|
| 699 | }
|
---|
| 700 |
|
---|
| 701 | if (AES_set_decrypt_key(kekri->key, kekri->keylen << 3, &actx)) {
|
---|
| 702 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT,
|
---|
| 703 | CMS_R_ERROR_SETTING_KEY);
|
---|
| 704 | goto err;
|
---|
| 705 | }
|
---|
| 706 |
|
---|
| 707 | ukey = OPENSSL_malloc(kekri->encryptedKey->length - 8);
|
---|
| 708 |
|
---|
| 709 | if (ukey == NULL) {
|
---|
| 710 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, ERR_R_MALLOC_FAILURE);
|
---|
| 711 | goto err;
|
---|
| 712 | }
|
---|
| 713 |
|
---|
| 714 | ukeylen = AES_unwrap_key(&actx, NULL, ukey,
|
---|
| 715 | kekri->encryptedKey->data,
|
---|
| 716 | kekri->encryptedKey->length);
|
---|
| 717 |
|
---|
| 718 | if (ukeylen <= 0) {
|
---|
| 719 | CMSerr(CMS_F_CMS_RECIPIENTINFO_KEKRI_DECRYPT, CMS_R_UNWRAP_ERROR);
|
---|
| 720 | goto err;
|
---|
| 721 | }
|
---|
| 722 |
|
---|
| 723 | ec->key = ukey;
|
---|
| 724 | ec->keylen = ukeylen;
|
---|
| 725 |
|
---|
| 726 | r = 1;
|
---|
| 727 |
|
---|
| 728 | err:
|
---|
| 729 |
|
---|
| 730 | if (!r)
|
---|
| 731 | OPENSSL_free(ukey);
|
---|
| 732 | OPENSSL_cleanse(&actx, sizeof(actx));
|
---|
| 733 |
|
---|
| 734 | return r;
|
---|
| 735 |
|
---|
| 736 | }
|
---|
| 737 |
|
---|
| 738 | int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
|
---|
| 739 | {
|
---|
| 740 | switch (ri->type) {
|
---|
| 741 | case CMS_RECIPINFO_TRANS:
|
---|
| 742 | return cms_RecipientInfo_ktri_decrypt(cms, ri);
|
---|
| 743 |
|
---|
| 744 | case CMS_RECIPINFO_KEK:
|
---|
| 745 | return cms_RecipientInfo_kekri_decrypt(cms, ri);
|
---|
| 746 |
|
---|
| 747 | case CMS_RECIPINFO_PASS:
|
---|
| 748 | return cms_RecipientInfo_pwri_crypt(cms, ri, 0);
|
---|
| 749 |
|
---|
| 750 | default:
|
---|
| 751 | CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
|
---|
| 752 | CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE);
|
---|
| 753 | return 0;
|
---|
| 754 | }
|
---|
| 755 | }
|
---|
| 756 |
|
---|
| 757 | int CMS_RecipientInfo_encrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)
|
---|
| 758 | {
|
---|
| 759 | switch (ri->type) {
|
---|
| 760 | case CMS_RECIPINFO_TRANS:
|
---|
| 761 | return cms_RecipientInfo_ktri_encrypt(cms, ri);
|
---|
| 762 |
|
---|
| 763 | case CMS_RECIPINFO_AGREE:
|
---|
| 764 | return cms_RecipientInfo_kari_encrypt(cms, ri);
|
---|
| 765 |
|
---|
| 766 | case CMS_RECIPINFO_KEK:
|
---|
| 767 | return cms_RecipientInfo_kekri_encrypt(cms, ri);
|
---|
| 768 |
|
---|
| 769 | case CMS_RECIPINFO_PASS:
|
---|
| 770 | return cms_RecipientInfo_pwri_crypt(cms, ri, 1);
|
---|
| 771 |
|
---|
| 772 | default:
|
---|
| 773 | CMSerr(CMS_F_CMS_RECIPIENTINFO_ENCRYPT,
|
---|
| 774 | CMS_R_UNSUPPORTED_RECIPIENT_TYPE);
|
---|
| 775 | return 0;
|
---|
| 776 | }
|
---|
| 777 | }
|
---|
| 778 |
|
---|
| 779 | /* Check structures and fixup version numbers (if necessary) */
|
---|
| 780 |
|
---|
| 781 | static void cms_env_set_originfo_version(CMS_EnvelopedData *env)
|
---|
| 782 | {
|
---|
| 783 | CMS_OriginatorInfo *org = env->originatorInfo;
|
---|
| 784 | int i;
|
---|
| 785 | if (org == NULL)
|
---|
| 786 | return;
|
---|
| 787 | for (i = 0; i < sk_CMS_CertificateChoices_num(org->certificates); i++) {
|
---|
| 788 | CMS_CertificateChoices *cch;
|
---|
| 789 | cch = sk_CMS_CertificateChoices_value(org->certificates, i);
|
---|
| 790 | if (cch->type == CMS_CERTCHOICE_OTHER) {
|
---|
| 791 | env->version = 4;
|
---|
| 792 | return;
|
---|
| 793 | } else if (cch->type == CMS_CERTCHOICE_V2ACERT) {
|
---|
| 794 | if (env->version < 3)
|
---|
| 795 | env->version = 3;
|
---|
| 796 | }
|
---|
| 797 | }
|
---|
| 798 |
|
---|
| 799 | for (i = 0; i < sk_CMS_RevocationInfoChoice_num(org->crls); i++) {
|
---|
| 800 | CMS_RevocationInfoChoice *rch;
|
---|
| 801 | rch = sk_CMS_RevocationInfoChoice_value(org->crls, i);
|
---|
| 802 | if (rch->type == CMS_REVCHOICE_OTHER) {
|
---|
| 803 | env->version = 4;
|
---|
| 804 | return;
|
---|
| 805 | }
|
---|
| 806 | }
|
---|
| 807 | }
|
---|
| 808 |
|
---|
| 809 | static void cms_env_set_version(CMS_EnvelopedData *env)
|
---|
| 810 | {
|
---|
| 811 | int i;
|
---|
| 812 | CMS_RecipientInfo *ri;
|
---|
| 813 |
|
---|
| 814 | /*
|
---|
| 815 | * Can't set version higher than 4 so if 4 or more already nothing to do.
|
---|
| 816 | */
|
---|
| 817 | if (env->version >= 4)
|
---|
| 818 | return;
|
---|
| 819 |
|
---|
| 820 | cms_env_set_originfo_version(env);
|
---|
| 821 |
|
---|
| 822 | if (env->version >= 3)
|
---|
| 823 | return;
|
---|
| 824 |
|
---|
| 825 | for (i = 0; i < sk_CMS_RecipientInfo_num(env->recipientInfos); i++) {
|
---|
| 826 | ri = sk_CMS_RecipientInfo_value(env->recipientInfos, i);
|
---|
| 827 | if (ri->type == CMS_RECIPINFO_PASS || ri->type == CMS_RECIPINFO_OTHER) {
|
---|
| 828 | env->version = 3;
|
---|
| 829 | return;
|
---|
| 830 | } else if (ri->type != CMS_RECIPINFO_TRANS
|
---|
| 831 | || ri->d.ktri->version != 0) {
|
---|
| 832 | env->version = 2;
|
---|
| 833 | }
|
---|
| 834 | }
|
---|
| 835 | if (env->originatorInfo || env->unprotectedAttrs)
|
---|
| 836 | env->version = 2;
|
---|
| 837 | if (env->version == 2)
|
---|
| 838 | return;
|
---|
| 839 | env->version = 0;
|
---|
| 840 | }
|
---|
| 841 |
|
---|
| 842 | BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
|
---|
| 843 | {
|
---|
| 844 | CMS_EncryptedContentInfo *ec;
|
---|
| 845 | STACK_OF(CMS_RecipientInfo) *rinfos;
|
---|
| 846 | CMS_RecipientInfo *ri;
|
---|
| 847 | int i, ok = 0;
|
---|
| 848 | BIO *ret;
|
---|
| 849 |
|
---|
| 850 | /* Get BIO first to set up key */
|
---|
| 851 |
|
---|
| 852 | ec = cms->d.envelopedData->encryptedContentInfo;
|
---|
| 853 | ret = cms_EncryptedContent_init_bio(ec);
|
---|
| 854 |
|
---|
| 855 | /* If error or no cipher end of processing */
|
---|
| 856 |
|
---|
| 857 | if (!ret || !ec->cipher)
|
---|
| 858 | return ret;
|
---|
| 859 |
|
---|
| 860 | /* Now encrypt content key according to each RecipientInfo type */
|
---|
| 861 |
|
---|
| 862 | rinfos = cms->d.envelopedData->recipientInfos;
|
---|
| 863 |
|
---|
| 864 | for (i = 0; i < sk_CMS_RecipientInfo_num(rinfos); i++) {
|
---|
| 865 | ri = sk_CMS_RecipientInfo_value(rinfos, i);
|
---|
| 866 | if (CMS_RecipientInfo_encrypt(cms, ri) <= 0) {
|
---|
| 867 | CMSerr(CMS_F_CMS_ENVELOPEDDATA_INIT_BIO,
|
---|
| 868 | CMS_R_ERROR_SETTING_RECIPIENTINFO);
|
---|
| 869 | goto err;
|
---|
| 870 | }
|
---|
| 871 | }
|
---|
| 872 | cms_env_set_version(cms->d.envelopedData);
|
---|
| 873 |
|
---|
| 874 | ok = 1;
|
---|
| 875 |
|
---|
| 876 | err:
|
---|
| 877 | ec->cipher = NULL;
|
---|
| 878 | OPENSSL_clear_free(ec->key, ec->keylen);
|
---|
| 879 | ec->key = NULL;
|
---|
| 880 | ec->keylen = 0;
|
---|
| 881 | if (ok)
|
---|
| 882 | return ret;
|
---|
| 883 | BIO_free(ret);
|
---|
| 884 | return NULL;
|
---|
| 885 |
|
---|
| 886 | }
|
---|
| 887 |
|
---|
| 888 | /*
|
---|
| 889 | * Get RecipientInfo type (if any) supported by a key (public or private). To
|
---|
| 890 | * retain compatibility with previous behaviour if the ctrl value isn't
|
---|
| 891 | * supported we assume key transport.
|
---|
| 892 | */
|
---|
| 893 | int cms_pkey_get_ri_type(EVP_PKEY *pk)
|
---|
| 894 | {
|
---|
| 895 | if (pk->ameth && pk->ameth->pkey_ctrl) {
|
---|
| 896 | int i, r;
|
---|
| 897 | i = pk->ameth->pkey_ctrl(pk, ASN1_PKEY_CTRL_CMS_RI_TYPE, 0, &r);
|
---|
| 898 | if (i > 0)
|
---|
| 899 | return r;
|
---|
| 900 | }
|
---|
| 901 | return CMS_RECIPINFO_TRANS;
|
---|
| 902 | }
|
---|