[331] | 1 | /*
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| 2 | * Copyright 1995-2016 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 <time.h>
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| 12 |
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| 13 | #include "internal/cryptlib.h"
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| 14 |
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| 15 | #ifndef NO_SYS_TYPES_H
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| 16 | # include <sys/types.h>
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| 17 | #endif
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| 18 |
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| 19 | #include <openssl/bn.h>
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| 20 | #include <openssl/evp.h>
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| 21 | #include <openssl/x509.h>
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| 22 | #include <openssl/objects.h>
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| 23 | #include <openssl/buffer.h>
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| 24 | #include "internal/asn1_int.h"
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| 25 | #include "internal/evp_int.h"
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| 26 |
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| 27 | #ifndef NO_ASN1_OLD
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| 28 |
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| 29 | int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
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| 30 | ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
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| 31 | const EVP_MD *type)
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| 32 | {
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| 33 | EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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| 34 | unsigned char *p, *buf_in = NULL, *buf_out = NULL;
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| 35 | int i, inl = 0, outl = 0, outll = 0;
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| 36 | X509_ALGOR *a;
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| 37 |
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| 38 | if (ctx == NULL) {
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| 39 | ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
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| 40 | goto err;
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| 41 | }
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| 42 | for (i = 0; i < 2; i++) {
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| 43 | if (i == 0)
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| 44 | a = algor1;
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| 45 | else
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| 46 | a = algor2;
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| 47 | if (a == NULL)
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| 48 | continue;
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| 49 | if (type->pkey_type == NID_dsaWithSHA1) {
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| 50 | /*
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| 51 | * special case: RFC 2459 tells us to omit 'parameters' with
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| 52 | * id-dsa-with-sha1
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| 53 | */
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| 54 | ASN1_TYPE_free(a->parameter);
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| 55 | a->parameter = NULL;
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| 56 | } else if ((a->parameter == NULL) ||
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| 57 | (a->parameter->type != V_ASN1_NULL)) {
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| 58 | ASN1_TYPE_free(a->parameter);
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| 59 | if ((a->parameter = ASN1_TYPE_new()) == NULL)
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| 60 | goto err;
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| 61 | a->parameter->type = V_ASN1_NULL;
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| 62 | }
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| 63 | ASN1_OBJECT_free(a->algorithm);
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| 64 | a->algorithm = OBJ_nid2obj(type->pkey_type);
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| 65 | if (a->algorithm == NULL) {
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| 66 | ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE);
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| 67 | goto err;
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| 68 | }
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| 69 | if (a->algorithm->length == 0) {
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| 70 | ASN1err(ASN1_F_ASN1_SIGN,
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| 71 | ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
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| 72 | goto err;
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| 73 | }
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| 74 | }
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| 75 | inl = i2d(data, NULL);
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| 76 | buf_in = OPENSSL_malloc((unsigned int)inl);
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| 77 | outll = outl = EVP_PKEY_size(pkey);
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| 78 | buf_out = OPENSSL_malloc((unsigned int)outl);
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| 79 | if ((buf_in == NULL) || (buf_out == NULL)) {
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| 80 | outl = 0;
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| 81 | ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
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| 82 | goto err;
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| 83 | }
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| 84 | p = buf_in;
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| 85 |
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| 86 | i2d(data, &p);
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| 87 | if (!EVP_SignInit_ex(ctx, type, NULL)
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| 88 | || !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
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| 89 | || !EVP_SignFinal(ctx, (unsigned char *)buf_out,
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| 90 | (unsigned int *)&outl, pkey)) {
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| 91 | outl = 0;
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| 92 | ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
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| 93 | goto err;
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| 94 | }
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| 95 | OPENSSL_free(signature->data);
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| 96 | signature->data = buf_out;
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| 97 | buf_out = NULL;
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| 98 | signature->length = outl;
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| 99 | /*
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| 100 | * In the interests of compatibility, I'll make sure that the bit string
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| 101 | * has a 'not-used bits' value of 0
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| 102 | */
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| 103 | signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
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| 104 | signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
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| 105 | err:
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| 106 | EVP_MD_CTX_free(ctx);
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| 107 | OPENSSL_clear_free((char *)buf_in, (unsigned int)inl);
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| 108 | OPENSSL_clear_free((char *)buf_out, outll);
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| 109 | return (outl);
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| 110 | }
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| 111 |
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| 112 | #endif
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| 113 |
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| 114 | int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,
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| 115 | X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,
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| 116 | EVP_PKEY *pkey, const EVP_MD *type)
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| 117 | {
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| 118 | int rv;
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| 119 | EVP_MD_CTX *ctx = EVP_MD_CTX_new();
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| 120 |
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| 121 | if (ctx == NULL) {
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| 122 | ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE);
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| 123 | return 0;
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| 124 | }
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| 125 | if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) {
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| 126 | EVP_MD_CTX_free(ctx);
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| 127 | return 0;
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| 128 | }
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| 129 |
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| 130 | rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx);
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| 131 |
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| 132 | EVP_MD_CTX_free(ctx);
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| 133 | return rv;
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| 134 | }
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| 135 |
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| 136 | int ASN1_item_sign_ctx(const ASN1_ITEM *it,
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| 137 | X509_ALGOR *algor1, X509_ALGOR *algor2,
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| 138 | ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
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| 139 | {
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| 140 | const EVP_MD *type;
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| 141 | EVP_PKEY *pkey;
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| 142 | unsigned char *buf_in = NULL, *buf_out = NULL;
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| 143 | size_t inl = 0, outl = 0, outll = 0;
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| 144 | int signid, paramtype;
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| 145 | int rv;
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| 146 |
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| 147 | type = EVP_MD_CTX_md(ctx);
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| 148 | pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
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| 149 |
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| 150 | if (type == NULL || pkey == NULL) {
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| 151 | ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
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| 152 | goto err;
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| 153 | }
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| 154 |
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| 155 | if (pkey->ameth == NULL) {
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| 156 | ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
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| 157 | goto err;
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| 158 | }
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| 159 |
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| 160 | if (pkey->ameth->item_sign) {
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| 161 | rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
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| 162 | if (rv == 1)
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| 163 | outl = signature->length;
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| 164 | /*-
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| 165 | * Return value meanings:
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| 166 | * <=0: error.
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| 167 | * 1: method does everything.
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| 168 | * 2: carry on as normal.
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| 169 | * 3: ASN1 method sets algorithm identifiers: just sign.
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| 170 | */
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| 171 | if (rv <= 0)
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| 172 | ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
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| 173 | if (rv <= 1)
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| 174 | goto err;
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| 175 | } else
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| 176 | rv = 2;
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| 177 |
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| 178 | if (rv == 2) {
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| 179 | if (!OBJ_find_sigid_by_algs(&signid,
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| 180 | EVP_MD_nid(type),
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| 181 | pkey->ameth->pkey_id)) {
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| 182 | ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
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| 183 | ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
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| 184 | goto err;
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| 185 | }
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| 186 |
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| 187 | if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
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| 188 | paramtype = V_ASN1_NULL;
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| 189 | else
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| 190 | paramtype = V_ASN1_UNDEF;
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| 191 |
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| 192 | if (algor1)
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| 193 | X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
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| 194 | if (algor2)
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| 195 | X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
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| 196 |
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| 197 | }
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| 198 |
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| 199 | inl = ASN1_item_i2d(asn, &buf_in, it);
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| 200 | outll = outl = EVP_PKEY_size(pkey);
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| 201 | buf_out = OPENSSL_malloc((unsigned int)outl);
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| 202 | if ((buf_in == NULL) || (buf_out == NULL)) {
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| 203 | outl = 0;
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| 204 | ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
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| 205 | goto err;
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| 206 | }
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| 207 |
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| 208 | if (!EVP_DigestSignUpdate(ctx, buf_in, inl)
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| 209 | || !EVP_DigestSignFinal(ctx, buf_out, &outl)) {
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| 210 | outl = 0;
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| 211 | ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
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| 212 | goto err;
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| 213 | }
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| 214 | OPENSSL_free(signature->data);
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| 215 | signature->data = buf_out;
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| 216 | buf_out = NULL;
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| 217 | signature->length = outl;
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| 218 | /*
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| 219 | * In the interests of compatibility, I'll make sure that the bit string
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| 220 | * has a 'not-used bits' value of 0
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| 221 | */
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| 222 | signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
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| 223 | signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
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| 224 | err:
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| 225 | OPENSSL_clear_free((char *)buf_in, (unsigned int)inl);
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| 226 | OPENSSL_clear_free((char *)buf_out, outll);
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| 227 | return (outl);
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| 228 | }
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