1 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 2 * project 2006. 3 */ 4 /* ==================================================================== 5 * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 19 * 3. All advertising materials mentioning features or use of this 20 * software must display the following acknowledgment: 21 * "This product includes software developed by the OpenSSL Project 22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 23 * 24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 25 * endorse or promote products derived from this software without 26 * prior written permission. For written permission, please contact 27 * licensing (at) OpenSSL.org. 28 * 29 * 5. Products derived from this software may not be called "OpenSSL" 30 * nor may "OpenSSL" appear in their names without prior written 31 * permission of the OpenSSL Project. 32 * 33 * 6. Redistributions of any form whatsoever must retain the following 34 * acknowledgment: 35 * "This product includes software developed by the OpenSSL Project 36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 49 * OF THE POSSIBILITY OF SUCH DAMAGE. 50 * ==================================================================== 51 * 52 * This product includes cryptographic software written by Eric Young 53 * (eay (at) cryptsoft.com). This product includes software written by Tim 54 * Hudson (tjh (at) cryptsoft.com). */ 55 56 #include <openssl/evp.h> 57 58 #include <openssl/err.h> 59 60 #include "internal.h" 61 #include "../digest/internal.h" 62 63 64 static const struct evp_md_pctx_ops md_pctx_ops = { 65 EVP_PKEY_CTX_free, 66 EVP_PKEY_CTX_dup, 67 }; 68 69 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 70 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey, 71 int is_verify) { 72 if (ctx->pctx == NULL) { 73 ctx->pctx = EVP_PKEY_CTX_new(pkey, e); 74 } 75 if (ctx->pctx == NULL) { 76 return 0; 77 } 78 ctx->pctx_ops = &md_pctx_ops; 79 80 if (type == NULL) { 81 OPENSSL_PUT_ERROR(EVP, EVP_R_NO_DEFAULT_DIGEST); 82 return 0; 83 } 84 85 if (is_verify) { 86 if (!EVP_PKEY_verify_init(ctx->pctx)) { 87 return 0; 88 } 89 } else { 90 if (!EVP_PKEY_sign_init(ctx->pctx)) { 91 return 0; 92 } 93 } 94 if (!EVP_PKEY_CTX_set_signature_md(ctx->pctx, type)) { 95 return 0; 96 } 97 if (pctx) { 98 *pctx = ctx->pctx; 99 } 100 if (!EVP_DigestInit_ex(ctx, type, e)) { 101 return 0; 102 } 103 return 1; 104 } 105 106 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, 107 ENGINE *e, EVP_PKEY *pkey) { 108 return do_sigver_init(ctx, pctx, type, e, pkey, 0); 109 } 110 111 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 112 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) { 113 return do_sigver_init(ctx, pctx, type, e, pkey, 1); 114 } 115 116 int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) { 117 return EVP_DigestUpdate(ctx, data, len); 118 } 119 120 int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len) { 121 return EVP_DigestUpdate(ctx, data, len); 122 } 123 124 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig, 125 size_t *out_sig_len) { 126 if (out_sig) { 127 EVP_MD_CTX tmp_ctx; 128 int ret; 129 uint8_t md[EVP_MAX_MD_SIZE]; 130 unsigned int mdlen; 131 132 EVP_MD_CTX_init(&tmp_ctx); 133 ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) && 134 EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) && 135 EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, md, mdlen); 136 EVP_MD_CTX_cleanup(&tmp_ctx); 137 138 return ret; 139 } else { 140 size_t s = EVP_MD_size(ctx->digest); 141 return EVP_PKEY_sign(ctx->pctx, out_sig, out_sig_len, NULL, s); 142 } 143 } 144 145 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, 146 size_t sig_len) { 147 EVP_MD_CTX tmp_ctx; 148 int ret; 149 uint8_t md[EVP_MAX_MD_SIZE]; 150 unsigned int mdlen; 151 152 EVP_MD_CTX_init(&tmp_ctx); 153 ret = EVP_MD_CTX_copy_ex(&tmp_ctx, ctx) && 154 EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen) && 155 EVP_PKEY_verify(ctx->pctx, sig, sig_len, md, mdlen); 156 EVP_MD_CTX_cleanup(&tmp_ctx); 157 158 return ret; 159 } 160
