[331] | 1 | /*
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| 2 | * Copyright 2006-2016 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 <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/asn1t.h>
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| 13 | #include <openssl/x509.h>
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| 14 | #include <openssl/bn.h>
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| 15 | #include <openssl/cms.h>
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| 16 | #include "internal/asn1_int.h"
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| 17 | #include "internal/evp_int.h"
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| 18 | #include "rsa_locl.h"
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| 19 |
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| 20 | #ifndef OPENSSL_NO_CMS
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| 21 | static int rsa_cms_sign(CMS_SignerInfo *si);
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| 22 | static int rsa_cms_verify(CMS_SignerInfo *si);
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| 23 | static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
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| 24 | static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
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| 25 | #endif
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| 26 |
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| 27 | static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
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| 28 | {
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| 29 | unsigned char *penc = NULL;
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| 30 | int penclen;
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| 31 | penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
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| 32 | if (penclen <= 0)
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| 33 | return 0;
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| 34 | if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_RSA),
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| 35 | V_ASN1_NULL, NULL, penc, penclen))
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| 36 | return 1;
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| 37 |
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| 38 | OPENSSL_free(penc);
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| 39 | return 0;
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| 40 | }
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| 41 |
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| 42 | static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
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| 43 | {
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| 44 | const unsigned char *p;
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| 45 | int pklen;
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| 46 | RSA *rsa = NULL;
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| 47 |
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| 48 | if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, NULL, pubkey))
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| 49 | return 0;
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| 50 | if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) {
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| 51 | RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
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| 52 | return 0;
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| 53 | }
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| 54 | EVP_PKEY_assign_RSA(pkey, rsa);
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| 55 | return 1;
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| 56 | }
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| 57 |
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| 58 | static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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| 59 | {
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| 60 | if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0
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| 61 | || BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0)
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| 62 | return 0;
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| 63 | return 1;
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| 64 | }
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| 65 |
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| 66 | static int old_rsa_priv_decode(EVP_PKEY *pkey,
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| 67 | const unsigned char **pder, int derlen)
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| 68 | {
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| 69 | RSA *rsa;
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| 70 |
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| 71 | if ((rsa = d2i_RSAPrivateKey(NULL, pder, derlen)) == NULL) {
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| 72 | RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
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| 73 | return 0;
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| 74 | }
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| 75 | EVP_PKEY_assign_RSA(pkey, rsa);
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| 76 | return 1;
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| 77 | }
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| 78 |
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| 79 | static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
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| 80 | {
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| 81 | return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
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| 82 | }
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| 83 |
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| 84 | static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
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| 85 | {
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| 86 | unsigned char *rk = NULL;
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| 87 | int rklen;
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| 88 | rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk);
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| 89 |
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| 90 | if (rklen <= 0) {
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| 91 | RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
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| 92 | return 0;
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| 93 | }
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| 94 |
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| 95 | if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_rsaEncryption), 0,
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| 96 | V_ASN1_NULL, NULL, rk, rklen)) {
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| 97 | RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
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| 98 | return 0;
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| 99 | }
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| 100 |
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| 101 | return 1;
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| 102 | }
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| 103 |
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| 104 | static int rsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
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| 105 | {
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| 106 | const unsigned char *p;
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| 107 | int pklen;
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| 108 | if (!PKCS8_pkey_get0(NULL, &p, &pklen, NULL, p8))
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| 109 | return 0;
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| 110 | return old_rsa_priv_decode(pkey, &p, pklen);
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| 111 | }
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| 112 |
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| 113 | static int int_rsa_size(const EVP_PKEY *pkey)
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| 114 | {
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| 115 | return RSA_size(pkey->pkey.rsa);
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| 116 | }
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| 117 |
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| 118 | static int rsa_bits(const EVP_PKEY *pkey)
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| 119 | {
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| 120 | return BN_num_bits(pkey->pkey.rsa->n);
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| 121 | }
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| 122 |
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| 123 | static int rsa_security_bits(const EVP_PKEY *pkey)
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| 124 | {
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| 125 | return RSA_security_bits(pkey->pkey.rsa);
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| 126 | }
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| 127 |
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| 128 | static void int_rsa_free(EVP_PKEY *pkey)
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| 129 | {
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| 130 | RSA_free(pkey->pkey.rsa);
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| 131 | }
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| 132 |
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| 133 | static int do_rsa_print(BIO *bp, const RSA *x, int off, int priv)
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| 134 | {
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| 135 | char *str;
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| 136 | const char *s;
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| 137 | int ret = 0, mod_len = 0;
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| 138 |
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| 139 | if (x->n != NULL)
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| 140 | mod_len = BN_num_bits(x->n);
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| 141 |
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| 142 | if (!BIO_indent(bp, off, 128))
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| 143 | goto err;
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| 144 |
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| 145 | if (priv && x->d) {
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| 146 | if (BIO_printf(bp, "Private-Key: (%d bit)\n", mod_len) <= 0)
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| 147 | goto err;
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| 148 | str = "modulus:";
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| 149 | s = "publicExponent:";
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| 150 | } else {
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| 151 | if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
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| 152 | goto err;
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| 153 | str = "Modulus:";
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| 154 | s = "Exponent:";
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| 155 | }
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| 156 | if (!ASN1_bn_print(bp, str, x->n, NULL, off))
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| 157 | goto err;
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| 158 | if (!ASN1_bn_print(bp, s, x->e, NULL, off))
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| 159 | goto err;
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| 160 | if (priv) {
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| 161 | if (!ASN1_bn_print(bp, "privateExponent:", x->d, NULL, off))
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| 162 | goto err;
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| 163 | if (!ASN1_bn_print(bp, "prime1:", x->p, NULL, off))
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| 164 | goto err;
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| 165 | if (!ASN1_bn_print(bp, "prime2:", x->q, NULL, off))
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| 166 | goto err;
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| 167 | if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, NULL, off))
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| 168 | goto err;
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| 169 | if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, NULL, off))
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| 170 | goto err;
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| 171 | if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, NULL, off))
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| 172 | goto err;
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| 173 | }
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| 174 | ret = 1;
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| 175 | err:
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| 176 | return (ret);
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| 177 | }
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| 178 |
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| 179 | static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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| 180 | ASN1_PCTX *ctx)
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| 181 | {
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| 182 | return do_rsa_print(bp, pkey->pkey.rsa, indent, 0);
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| 183 | }
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| 184 |
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| 185 | static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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| 186 | ASN1_PCTX *ctx)
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| 187 | {
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| 188 | return do_rsa_print(bp, pkey->pkey.rsa, indent, 1);
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| 189 | }
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| 190 |
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| 191 | /* Given an MGF1 Algorithm ID decode to an Algorithm Identifier */
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| 192 | static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
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| 193 | {
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| 194 | if (alg == NULL)
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| 195 | return NULL;
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| 196 | if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
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| 197 | return NULL;
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| 198 | return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
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| 199 | alg->parameter);
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| 200 | }
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| 201 |
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| 202 | static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg,
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| 203 | X509_ALGOR **pmaskHash)
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| 204 | {
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| 205 | RSA_PSS_PARAMS *pss;
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| 206 |
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| 207 | *pmaskHash = NULL;
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| 208 |
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| 209 | pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
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| 210 | alg->parameter);
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| 211 |
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| 212 | if (!pss)
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| 213 | return NULL;
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| 214 |
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| 215 | *pmaskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
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| 216 |
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| 217 | return pss;
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| 218 | }
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| 219 |
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| 220 | static int rsa_pss_param_print(BIO *bp, RSA_PSS_PARAMS *pss,
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| 221 | X509_ALGOR *maskHash, int indent)
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| 222 | {
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| 223 | int rv = 0;
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| 224 | if (!pss) {
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| 225 | if (BIO_puts(bp, " (INVALID PSS PARAMETERS)\n") <= 0)
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| 226 | return 0;
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| 227 | return 1;
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| 228 | }
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| 229 | if (BIO_puts(bp, "\n") <= 0)
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| 230 | goto err;
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| 231 | if (!BIO_indent(bp, indent, 128))
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| 232 | goto err;
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| 233 | if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
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| 234 | goto err;
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| 235 |
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| 236 | if (pss->hashAlgorithm) {
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| 237 | if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
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| 238 | goto err;
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| 239 | } else if (BIO_puts(bp, "sha1 (default)") <= 0)
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| 240 | goto err;
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| 241 |
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| 242 | if (BIO_puts(bp, "\n") <= 0)
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| 243 | goto err;
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| 244 |
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| 245 | if (!BIO_indent(bp, indent, 128))
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| 246 | goto err;
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| 247 |
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| 248 | if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
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| 249 | goto err;
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| 250 | if (pss->maskGenAlgorithm) {
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| 251 | if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
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| 252 | goto err;
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| 253 | if (BIO_puts(bp, " with ") <= 0)
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| 254 | goto err;
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| 255 | if (maskHash) {
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| 256 | if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
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| 257 | goto err;
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| 258 | } else if (BIO_puts(bp, "INVALID") <= 0)
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| 259 | goto err;
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| 260 | } else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0)
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| 261 | goto err;
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| 262 | BIO_puts(bp, "\n");
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| 263 |
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| 264 | if (!BIO_indent(bp, indent, 128))
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| 265 | goto err;
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| 266 | if (BIO_puts(bp, "Salt Length: 0x") <= 0)
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| 267 | goto err;
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| 268 | if (pss->saltLength) {
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| 269 | if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
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| 270 | goto err;
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| 271 | } else if (BIO_puts(bp, "14 (default)") <= 0)
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| 272 | goto err;
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| 273 | BIO_puts(bp, "\n");
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| 274 |
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| 275 | if (!BIO_indent(bp, indent, 128))
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| 276 | goto err;
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| 277 | if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
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| 278 | goto err;
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| 279 | if (pss->trailerField) {
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| 280 | if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
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| 281 | goto err;
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| 282 | } else if (BIO_puts(bp, "BC (default)") <= 0)
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| 283 | goto err;
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| 284 | BIO_puts(bp, "\n");
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| 285 |
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| 286 | rv = 1;
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| 287 |
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| 288 | err:
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| 289 | return rv;
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| 290 |
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| 291 | }
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| 292 |
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| 293 | static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
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| 294 | const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
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| 295 | {
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| 296 | if (OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss) {
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| 297 | int rv;
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| 298 | RSA_PSS_PARAMS *pss;
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| 299 | X509_ALGOR *maskHash;
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| 300 | pss = rsa_pss_decode(sigalg, &maskHash);
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| 301 | rv = rsa_pss_param_print(bp, pss, maskHash, indent);
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| 302 | RSA_PSS_PARAMS_free(pss);
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| 303 | X509_ALGOR_free(maskHash);
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| 304 | if (!rv)
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| 305 | return 0;
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| 306 | } else if (!sig && BIO_puts(bp, "\n") <= 0)
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| 307 | return 0;
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| 308 | if (sig)
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| 309 | return X509_signature_dump(bp, sig, indent);
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| 310 | return 1;
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| 311 | }
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| 312 |
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| 313 | static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
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| 314 | {
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| 315 | X509_ALGOR *alg = NULL;
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| 316 | switch (op) {
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| 317 |
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| 318 | case ASN1_PKEY_CTRL_PKCS7_SIGN:
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| 319 | if (arg1 == 0)
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| 320 | PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
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| 321 | break;
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| 322 |
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| 323 | case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
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| 324 | if (arg1 == 0)
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| 325 | PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
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| 326 | break;
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| 327 | #ifndef OPENSSL_NO_CMS
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| 328 | case ASN1_PKEY_CTRL_CMS_SIGN:
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| 329 | if (arg1 == 0)
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| 330 | return rsa_cms_sign(arg2);
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| 331 | else if (arg1 == 1)
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| 332 | return rsa_cms_verify(arg2);
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| 333 | break;
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| 334 |
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| 335 | case ASN1_PKEY_CTRL_CMS_ENVELOPE:
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| 336 | if (arg1 == 0)
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| 337 | return rsa_cms_encrypt(arg2);
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| 338 | else if (arg1 == 1)
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| 339 | return rsa_cms_decrypt(arg2);
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| 340 | break;
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| 341 |
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| 342 | case ASN1_PKEY_CTRL_CMS_RI_TYPE:
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| 343 | *(int *)arg2 = CMS_RECIPINFO_TRANS;
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| 344 | return 1;
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| 345 | #endif
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| 346 |
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| 347 | case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
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| 348 | *(int *)arg2 = NID_sha256;
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| 349 | return 1;
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| 350 |
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| 351 | default:
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| 352 | return -2;
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| 353 |
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| 354 | }
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| 355 |
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| 356 | if (alg)
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| 357 | X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
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| 358 |
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| 359 | return 1;
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| 360 |
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| 361 | }
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| 362 |
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| 363 | /* allocate and set algorithm ID from EVP_MD, default SHA1 */
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| 364 | static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md)
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| 365 | {
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| 366 | if (EVP_MD_type(md) == NID_sha1)
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| 367 | return 1;
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| 368 | *palg = X509_ALGOR_new();
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| 369 | if (*palg == NULL)
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| 370 | return 0;
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| 371 | X509_ALGOR_set_md(*palg, md);
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| 372 | return 1;
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| 373 | }
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| 374 |
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| 375 | /* Allocate and set MGF1 algorithm ID from EVP_MD */
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| 376 | static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
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| 377 | {
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| 378 | X509_ALGOR *algtmp = NULL;
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| 379 | ASN1_STRING *stmp = NULL;
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| 380 | *palg = NULL;
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| 381 | if (EVP_MD_type(mgf1md) == NID_sha1)
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| 382 | return 1;
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| 383 | /* need to embed algorithm ID inside another */
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| 384 | if (!rsa_md_to_algor(&algtmp, mgf1md))
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| 385 | goto err;
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| 386 | if (!ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp))
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| 387 | goto err;
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| 388 | *palg = X509_ALGOR_new();
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| 389 | if (*palg == NULL)
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| 390 | goto err;
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| 391 | X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
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| 392 | stmp = NULL;
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| 393 | err:
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| 394 | ASN1_STRING_free(stmp);
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| 395 | X509_ALGOR_free(algtmp);
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| 396 | if (*palg)
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| 397 | return 1;
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| 398 | return 0;
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| 399 | }
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| 400 |
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| 401 | /* convert algorithm ID to EVP_MD, default SHA1 */
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| 402 | static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg)
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| 403 | {
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| 404 | const EVP_MD *md;
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| 405 | if (!alg)
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| 406 | return EVP_sha1();
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| 407 | md = EVP_get_digestbyobj(alg->algorithm);
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| 408 | if (md == NULL)
|
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| 409 | RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST);
|
---|
| 410 | return md;
|
---|
| 411 | }
|
---|
| 412 |
|
---|
| 413 | /* convert MGF1 algorithm ID to EVP_MD, default SHA1 */
|
---|
| 414 | static const EVP_MD *rsa_mgf1_to_md(X509_ALGOR *alg, X509_ALGOR *maskHash)
|
---|
| 415 | {
|
---|
| 416 | const EVP_MD *md;
|
---|
| 417 | if (!alg)
|
---|
| 418 | return EVP_sha1();
|
---|
| 419 | /* Check mask and lookup mask hash algorithm */
|
---|
| 420 | if (OBJ_obj2nid(alg->algorithm) != NID_mgf1) {
|
---|
| 421 | RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNSUPPORTED_MASK_ALGORITHM);
|
---|
| 422 | return NULL;
|
---|
| 423 | }
|
---|
| 424 | if (!maskHash) {
|
---|
| 425 | RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNSUPPORTED_MASK_PARAMETER);
|
---|
| 426 | return NULL;
|
---|
| 427 | }
|
---|
| 428 | md = EVP_get_digestbyobj(maskHash->algorithm);
|
---|
| 429 | if (md == NULL) {
|
---|
| 430 | RSAerr(RSA_F_RSA_MGF1_TO_MD, RSA_R_UNKNOWN_MASK_DIGEST);
|
---|
| 431 | return NULL;
|
---|
| 432 | }
|
---|
| 433 | return md;
|
---|
| 434 | }
|
---|
| 435 |
|
---|
| 436 | /*
|
---|
| 437 | * Convert EVP_PKEY_CTX is PSS mode into corresponding algorithm parameter,
|
---|
| 438 | * suitable for setting an AlgorithmIdentifier.
|
---|
| 439 | */
|
---|
| 440 |
|
---|
| 441 | static ASN1_STRING *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
|
---|
| 442 | {
|
---|
| 443 | const EVP_MD *sigmd, *mgf1md;
|
---|
| 444 | RSA_PSS_PARAMS *pss = NULL;
|
---|
| 445 | ASN1_STRING *os = NULL;
|
---|
| 446 | EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
|
---|
| 447 | int saltlen, rv = 0;
|
---|
| 448 | if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0)
|
---|
| 449 | goto err;
|
---|
| 450 | if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
|
---|
| 451 | goto err;
|
---|
| 452 | if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
|
---|
| 453 | goto err;
|
---|
| 454 | if (saltlen == -1)
|
---|
| 455 | saltlen = EVP_MD_size(sigmd);
|
---|
| 456 | else if (saltlen == -2) {
|
---|
| 457 | saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
|
---|
| 458 | if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0)
|
---|
| 459 | saltlen--;
|
---|
| 460 | }
|
---|
| 461 | pss = RSA_PSS_PARAMS_new();
|
---|
| 462 | if (pss == NULL)
|
---|
| 463 | goto err;
|
---|
| 464 | if (saltlen != 20) {
|
---|
| 465 | pss->saltLength = ASN1_INTEGER_new();
|
---|
| 466 | if (pss->saltLength == NULL)
|
---|
| 467 | goto err;
|
---|
| 468 | if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
|
---|
| 469 | goto err;
|
---|
| 470 | }
|
---|
| 471 | if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
|
---|
| 472 | goto err;
|
---|
| 473 | if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
|
---|
| 474 | goto err;
|
---|
| 475 | /* Finally create string with pss parameter encoding. */
|
---|
| 476 | if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os))
|
---|
| 477 | goto err;
|
---|
| 478 | rv = 1;
|
---|
| 479 | err:
|
---|
| 480 | RSA_PSS_PARAMS_free(pss);
|
---|
| 481 | if (rv)
|
---|
| 482 | return os;
|
---|
| 483 | ASN1_STRING_free(os);
|
---|
| 484 | return NULL;
|
---|
| 485 | }
|
---|
| 486 |
|
---|
| 487 | /*
|
---|
| 488 | * From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL
|
---|
| 489 | * then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are
|
---|
| 490 | * passed to pkctx instead.
|
---|
| 491 | */
|
---|
| 492 |
|
---|
| 493 | static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
|
---|
| 494 | X509_ALGOR *sigalg, EVP_PKEY *pkey)
|
---|
| 495 | {
|
---|
| 496 | int rv = -1;
|
---|
| 497 | int saltlen;
|
---|
| 498 | const EVP_MD *mgf1md = NULL, *md = NULL;
|
---|
| 499 | RSA_PSS_PARAMS *pss;
|
---|
| 500 | X509_ALGOR *maskHash;
|
---|
| 501 | /* Sanity check: make sure it is PSS */
|
---|
| 502 | if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
|
---|
| 503 | RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
|
---|
| 504 | return -1;
|
---|
| 505 | }
|
---|
| 506 | /* Decode PSS parameters */
|
---|
| 507 | pss = rsa_pss_decode(sigalg, &maskHash);
|
---|
| 508 |
|
---|
| 509 | if (pss == NULL) {
|
---|
| 510 | RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
|
---|
| 511 | goto err;
|
---|
| 512 | }
|
---|
| 513 | mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash);
|
---|
| 514 | if (!mgf1md)
|
---|
| 515 | goto err;
|
---|
| 516 | md = rsa_algor_to_md(pss->hashAlgorithm);
|
---|
| 517 | if (!md)
|
---|
| 518 | goto err;
|
---|
| 519 |
|
---|
| 520 | if (pss->saltLength) {
|
---|
| 521 | saltlen = ASN1_INTEGER_get(pss->saltLength);
|
---|
| 522 |
|
---|
| 523 | /*
|
---|
| 524 | * Could perform more salt length sanity checks but the main RSA
|
---|
| 525 | * routines will trap other invalid values anyway.
|
---|
| 526 | */
|
---|
| 527 | if (saltlen < 0) {
|
---|
| 528 | RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_SALT_LENGTH);
|
---|
| 529 | goto err;
|
---|
| 530 | }
|
---|
| 531 | } else
|
---|
| 532 | saltlen = 20;
|
---|
| 533 |
|
---|
| 534 | /*
|
---|
| 535 | * low-level routines support only trailer field 0xbc (value 1) and
|
---|
| 536 | * PKCS#1 says we should reject any other value anyway.
|
---|
| 537 | */
|
---|
| 538 | if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
|
---|
| 539 | RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_TRAILER);
|
---|
| 540 | goto err;
|
---|
| 541 | }
|
---|
| 542 |
|
---|
| 543 | /* We have all parameters now set up context */
|
---|
| 544 |
|
---|
| 545 | if (pkey) {
|
---|
| 546 | if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
|
---|
| 547 | goto err;
|
---|
| 548 | } else {
|
---|
| 549 | const EVP_MD *checkmd;
|
---|
| 550 | if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
|
---|
| 551 | goto err;
|
---|
| 552 | if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
|
---|
| 553 | RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
|
---|
| 554 | goto err;
|
---|
| 555 | }
|
---|
| 556 | }
|
---|
| 557 |
|
---|
| 558 | if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
|
---|
| 559 | goto err;
|
---|
| 560 |
|
---|
| 561 | if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
|
---|
| 562 | goto err;
|
---|
| 563 |
|
---|
| 564 | if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
|
---|
| 565 | goto err;
|
---|
| 566 | /* Carry on */
|
---|
| 567 | rv = 1;
|
---|
| 568 |
|
---|
| 569 | err:
|
---|
| 570 | RSA_PSS_PARAMS_free(pss);
|
---|
| 571 | X509_ALGOR_free(maskHash);
|
---|
| 572 | return rv;
|
---|
| 573 | }
|
---|
| 574 |
|
---|
| 575 | #ifndef OPENSSL_NO_CMS
|
---|
| 576 | static int rsa_cms_verify(CMS_SignerInfo *si)
|
---|
| 577 | {
|
---|
| 578 | int nid, nid2;
|
---|
| 579 | X509_ALGOR *alg;
|
---|
| 580 | EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
|
---|
| 581 | CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
|
---|
| 582 | nid = OBJ_obj2nid(alg->algorithm);
|
---|
| 583 | if (nid == NID_rsaEncryption)
|
---|
| 584 | return 1;
|
---|
| 585 | if (nid == NID_rsassaPss)
|
---|
| 586 | return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
|
---|
| 587 | /* Workaround for some implementation that use a signature OID */
|
---|
| 588 | if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
|
---|
| 589 | if (nid2 == NID_rsaEncryption)
|
---|
| 590 | return 1;
|
---|
| 591 | }
|
---|
| 592 | return 0;
|
---|
| 593 | }
|
---|
| 594 | #endif
|
---|
| 595 |
|
---|
| 596 | /*
|
---|
| 597 | * Customised RSA item verification routine. This is called when a signature
|
---|
| 598 | * is encountered requiring special handling. We currently only handle PSS.
|
---|
| 599 | */
|
---|
| 600 |
|
---|
| 601 | static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
|
---|
| 602 | X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
|
---|
| 603 | EVP_PKEY *pkey)
|
---|
| 604 | {
|
---|
| 605 | /* Sanity check: make sure it is PSS */
|
---|
| 606 | if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
|
---|
| 607 | RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
|
---|
| 608 | return -1;
|
---|
| 609 | }
|
---|
| 610 | if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
|
---|
| 611 | /* Carry on */
|
---|
| 612 | return 2;
|
---|
| 613 | }
|
---|
| 614 | return -1;
|
---|
| 615 | }
|
---|
| 616 |
|
---|
| 617 | #ifndef OPENSSL_NO_CMS
|
---|
| 618 | static int rsa_cms_sign(CMS_SignerInfo *si)
|
---|
| 619 | {
|
---|
| 620 | int pad_mode = RSA_PKCS1_PADDING;
|
---|
| 621 | X509_ALGOR *alg;
|
---|
| 622 | EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
|
---|
| 623 | ASN1_STRING *os = NULL;
|
---|
| 624 | CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
|
---|
| 625 | if (pkctx) {
|
---|
| 626 | if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
|
---|
| 627 | return 0;
|
---|
| 628 | }
|
---|
| 629 | if (pad_mode == RSA_PKCS1_PADDING) {
|
---|
| 630 | X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
|
---|
| 631 | return 1;
|
---|
| 632 | }
|
---|
| 633 | /* We don't support it */
|
---|
| 634 | if (pad_mode != RSA_PKCS1_PSS_PADDING)
|
---|
| 635 | return 0;
|
---|
| 636 | os = rsa_ctx_to_pss(pkctx);
|
---|
| 637 | if (!os)
|
---|
| 638 | return 0;
|
---|
| 639 | X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsassaPss), V_ASN1_SEQUENCE, os);
|
---|
| 640 | return 1;
|
---|
| 641 | }
|
---|
| 642 | #endif
|
---|
| 643 |
|
---|
| 644 | static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
|
---|
| 645 | X509_ALGOR *alg1, X509_ALGOR *alg2,
|
---|
| 646 | ASN1_BIT_STRING *sig)
|
---|
| 647 | {
|
---|
| 648 | int pad_mode;
|
---|
| 649 | EVP_PKEY_CTX *pkctx = EVP_MD_CTX_pkey_ctx(ctx);
|
---|
| 650 | if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
|
---|
| 651 | return 0;
|
---|
| 652 | if (pad_mode == RSA_PKCS1_PADDING)
|
---|
| 653 | return 2;
|
---|
| 654 | if (pad_mode == RSA_PKCS1_PSS_PADDING) {
|
---|
| 655 | ASN1_STRING *os1 = NULL;
|
---|
| 656 | os1 = rsa_ctx_to_pss(pkctx);
|
---|
| 657 | if (!os1)
|
---|
| 658 | return 0;
|
---|
| 659 | /* Duplicate parameters if we have to */
|
---|
| 660 | if (alg2) {
|
---|
| 661 | ASN1_STRING *os2 = ASN1_STRING_dup(os1);
|
---|
| 662 | if (!os2) {
|
---|
| 663 | ASN1_STRING_free(os1);
|
---|
| 664 | return 0;
|
---|
| 665 | }
|
---|
| 666 | X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_rsassaPss),
|
---|
| 667 | V_ASN1_SEQUENCE, os2);
|
---|
| 668 | }
|
---|
| 669 | X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_rsassaPss),
|
---|
| 670 | V_ASN1_SEQUENCE, os1);
|
---|
| 671 | return 3;
|
---|
| 672 | }
|
---|
| 673 | return 2;
|
---|
| 674 | }
|
---|
| 675 |
|
---|
| 676 | #ifndef OPENSSL_NO_CMS
|
---|
| 677 | static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg,
|
---|
| 678 | X509_ALGOR **pmaskHash)
|
---|
| 679 | {
|
---|
| 680 | RSA_OAEP_PARAMS *pss;
|
---|
| 681 |
|
---|
| 682 | *pmaskHash = NULL;
|
---|
| 683 |
|
---|
| 684 | pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
|
---|
| 685 | alg->parameter);
|
---|
| 686 |
|
---|
| 687 | if (!pss)
|
---|
| 688 | return NULL;
|
---|
| 689 |
|
---|
| 690 | *pmaskHash = rsa_mgf1_decode(pss->maskGenFunc);
|
---|
| 691 |
|
---|
| 692 | return pss;
|
---|
| 693 | }
|
---|
| 694 |
|
---|
| 695 | static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
|
---|
| 696 | {
|
---|
| 697 | EVP_PKEY_CTX *pkctx;
|
---|
| 698 | X509_ALGOR *cmsalg;
|
---|
| 699 | int nid;
|
---|
| 700 | int rv = -1;
|
---|
| 701 | unsigned char *label = NULL;
|
---|
| 702 | int labellen = 0;
|
---|
| 703 | const EVP_MD *mgf1md = NULL, *md = NULL;
|
---|
| 704 | RSA_OAEP_PARAMS *oaep;
|
---|
| 705 | X509_ALGOR *maskHash;
|
---|
| 706 | pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
|
---|
| 707 | if (!pkctx)
|
---|
| 708 | return 0;
|
---|
| 709 | if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
|
---|
| 710 | return -1;
|
---|
| 711 | nid = OBJ_obj2nid(cmsalg->algorithm);
|
---|
| 712 | if (nid == NID_rsaEncryption)
|
---|
| 713 | return 1;
|
---|
| 714 | if (nid != NID_rsaesOaep) {
|
---|
| 715 | RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
|
---|
| 716 | return -1;
|
---|
| 717 | }
|
---|
| 718 | /* Decode OAEP parameters */
|
---|
| 719 | oaep = rsa_oaep_decode(cmsalg, &maskHash);
|
---|
| 720 |
|
---|
| 721 | if (oaep == NULL) {
|
---|
| 722 | RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
|
---|
| 723 | goto err;
|
---|
| 724 | }
|
---|
| 725 |
|
---|
| 726 | mgf1md = rsa_mgf1_to_md(oaep->maskGenFunc, maskHash);
|
---|
| 727 | if (!mgf1md)
|
---|
| 728 | goto err;
|
---|
| 729 | md = rsa_algor_to_md(oaep->hashFunc);
|
---|
| 730 | if (!md)
|
---|
| 731 | goto err;
|
---|
| 732 |
|
---|
| 733 | if (oaep->pSourceFunc) {
|
---|
| 734 | X509_ALGOR *plab = oaep->pSourceFunc;
|
---|
| 735 | if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
|
---|
| 736 | RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
|
---|
| 737 | goto err;
|
---|
| 738 | }
|
---|
| 739 | if (plab->parameter->type != V_ASN1_OCTET_STRING) {
|
---|
| 740 | RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
|
---|
| 741 | goto err;
|
---|
| 742 | }
|
---|
| 743 |
|
---|
| 744 | label = plab->parameter->value.octet_string->data;
|
---|
| 745 | /* Stop label being freed when OAEP parameters are freed */
|
---|
| 746 | plab->parameter->value.octet_string->data = NULL;
|
---|
| 747 | labellen = plab->parameter->value.octet_string->length;
|
---|
| 748 | }
|
---|
| 749 |
|
---|
| 750 | if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
|
---|
| 751 | goto err;
|
---|
| 752 | if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
|
---|
| 753 | goto err;
|
---|
| 754 | if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
|
---|
| 755 | goto err;
|
---|
| 756 | if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
|
---|
| 757 | goto err;
|
---|
| 758 | /* Carry on */
|
---|
| 759 | rv = 1;
|
---|
| 760 |
|
---|
| 761 | err:
|
---|
| 762 | RSA_OAEP_PARAMS_free(oaep);
|
---|
| 763 | X509_ALGOR_free(maskHash);
|
---|
| 764 | return rv;
|
---|
| 765 | }
|
---|
| 766 |
|
---|
| 767 | static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
|
---|
| 768 | {
|
---|
| 769 | const EVP_MD *md, *mgf1md;
|
---|
| 770 | RSA_OAEP_PARAMS *oaep = NULL;
|
---|
| 771 | ASN1_STRING *os = NULL;
|
---|
| 772 | X509_ALGOR *alg;
|
---|
| 773 | EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
|
---|
| 774 | int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
|
---|
| 775 | unsigned char *label;
|
---|
| 776 | CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg);
|
---|
| 777 | if (pkctx) {
|
---|
| 778 | if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
|
---|
| 779 | return 0;
|
---|
| 780 | }
|
---|
| 781 | if (pad_mode == RSA_PKCS1_PADDING) {
|
---|
| 782 | X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
|
---|
| 783 | return 1;
|
---|
| 784 | }
|
---|
| 785 | /* Not supported */
|
---|
| 786 | if (pad_mode != RSA_PKCS1_OAEP_PADDING)
|
---|
| 787 | return 0;
|
---|
| 788 | if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
|
---|
| 789 | goto err;
|
---|
| 790 | if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
|
---|
| 791 | goto err;
|
---|
| 792 | labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
|
---|
| 793 | if (labellen < 0)
|
---|
| 794 | goto err;
|
---|
| 795 | oaep = RSA_OAEP_PARAMS_new();
|
---|
| 796 | if (oaep == NULL)
|
---|
| 797 | goto err;
|
---|
| 798 | if (!rsa_md_to_algor(&oaep->hashFunc, md))
|
---|
| 799 | goto err;
|
---|
| 800 | if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
|
---|
| 801 | goto err;
|
---|
| 802 | if (labellen > 0) {
|
---|
| 803 | ASN1_OCTET_STRING *los;
|
---|
| 804 | oaep->pSourceFunc = X509_ALGOR_new();
|
---|
| 805 | if (oaep->pSourceFunc == NULL)
|
---|
| 806 | goto err;
|
---|
| 807 | los = ASN1_OCTET_STRING_new();
|
---|
| 808 | if (los == NULL)
|
---|
| 809 | goto err;
|
---|
| 810 | if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
|
---|
| 811 | ASN1_OCTET_STRING_free(los);
|
---|
| 812 | goto err;
|
---|
| 813 | }
|
---|
| 814 | X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
|
---|
| 815 | V_ASN1_OCTET_STRING, los);
|
---|
| 816 | }
|
---|
| 817 | /* create string with pss parameter encoding. */
|
---|
| 818 | if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
|
---|
| 819 | goto err;
|
---|
| 820 | X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
|
---|
| 821 | os = NULL;
|
---|
| 822 | rv = 1;
|
---|
| 823 | err:
|
---|
| 824 | RSA_OAEP_PARAMS_free(oaep);
|
---|
| 825 | ASN1_STRING_free(os);
|
---|
| 826 | return rv;
|
---|
| 827 | }
|
---|
| 828 | #endif
|
---|
| 829 |
|
---|
| 830 | const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[2] = {
|
---|
| 831 | {
|
---|
| 832 | EVP_PKEY_RSA,
|
---|
| 833 | EVP_PKEY_RSA,
|
---|
| 834 | ASN1_PKEY_SIGPARAM_NULL,
|
---|
| 835 |
|
---|
| 836 | "RSA",
|
---|
| 837 | "OpenSSL RSA method",
|
---|
| 838 |
|
---|
| 839 | rsa_pub_decode,
|
---|
| 840 | rsa_pub_encode,
|
---|
| 841 | rsa_pub_cmp,
|
---|
| 842 | rsa_pub_print,
|
---|
| 843 |
|
---|
| 844 | rsa_priv_decode,
|
---|
| 845 | rsa_priv_encode,
|
---|
| 846 | rsa_priv_print,
|
---|
| 847 |
|
---|
| 848 | int_rsa_size,
|
---|
| 849 | rsa_bits,
|
---|
| 850 | rsa_security_bits,
|
---|
| 851 |
|
---|
| 852 | 0, 0, 0, 0, 0, 0,
|
---|
| 853 |
|
---|
| 854 | rsa_sig_print,
|
---|
| 855 | int_rsa_free,
|
---|
| 856 | rsa_pkey_ctrl,
|
---|
| 857 | old_rsa_priv_decode,
|
---|
| 858 | old_rsa_priv_encode,
|
---|
| 859 | rsa_item_verify,
|
---|
| 860 | rsa_item_sign},
|
---|
| 861 |
|
---|
| 862 | {
|
---|
| 863 | EVP_PKEY_RSA2,
|
---|
| 864 | EVP_PKEY_RSA,
|
---|
| 865 | ASN1_PKEY_ALIAS}
|
---|
| 866 | };
|
---|