1 /* m_sigver.c */ 2 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL 3 * project 2006. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing (at) OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 #include "cryptlib.h" 61 #include <openssl/evp.h> 62 #include <openssl/objects.h> 63 #include <openssl/x509.h> 64 #include "evp_locl.h" 65 66 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 67 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey, 68 int ver) 69 { 70 if (ctx->pctx == NULL) 71 ctx->pctx = EVP_PKEY_CTX_new(pkey, e); 72 if (ctx->pctx == NULL) 73 return 0; 74 75 if (type == NULL) 76 { 77 int def_nid; 78 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0) 79 type = EVP_get_digestbynid(def_nid); 80 } 81 82 if (type == NULL) 83 { 84 EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST); 85 return 0; 86 } 87 88 if (ver) 89 { 90 if (ctx->pctx->pmeth->verifyctx_init) 91 { 92 if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <=0) 93 return 0; 94 ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; 95 } 96 else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) 97 return 0; 98 } 99 else 100 { 101 if (ctx->pctx->pmeth->signctx_init) 102 { 103 if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0) 104 return 0; 105 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; 106 } 107 else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) 108 return 0; 109 } 110 if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0) 111 return 0; 112 if (pctx) 113 *pctx = ctx->pctx; 114 if (!EVP_DigestInit_ex(ctx, type, e)) 115 return 0; 116 return 1; 117 } 118 119 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 120 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) 121 { 122 return do_sigver_init(ctx, pctx, type, e, pkey, 0); 123 } 124 125 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 126 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) 127 { 128 return do_sigver_init(ctx, pctx, type, e, pkey, 1); 129 } 130 131 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen) 132 { 133 int sctx, r = 0; 134 if (ctx->pctx->pmeth->signctx) 135 sctx = 1; 136 else 137 sctx = 0; 138 if (sigret) 139 { 140 EVP_MD_CTX tmp_ctx; 141 unsigned char md[EVP_MAX_MD_SIZE]; 142 unsigned int mdlen; 143 EVP_MD_CTX_init(&tmp_ctx); 144 if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx)) 145 return 0; 146 if (sctx) 147 r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, 148 sigret, siglen, &tmp_ctx); 149 else 150 r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen); 151 EVP_MD_CTX_cleanup(&tmp_ctx); 152 if (sctx || !r) 153 return r; 154 if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0) 155 return 0; 156 } 157 else 158 { 159 if (sctx) 160 { 161 if (ctx->pctx->pmeth->signctx(ctx->pctx, sigret, siglen, ctx) <= 0) 162 return 0; 163 } 164 else 165 { 166 int s = EVP_MD_size(ctx->digest); 167 if (s < 0 || EVP_PKEY_sign(ctx->pctx, sigret, siglen, NULL, s) <= 0) 168 return 0; 169 } 170 } 171 return 1; 172 } 173 174 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, unsigned char *sig, size_t siglen) 175 { 176 EVP_MD_CTX tmp_ctx; 177 unsigned char md[EVP_MAX_MD_SIZE]; 178 int r; 179 unsigned int mdlen; 180 int vctx; 181 182 if (ctx->pctx->pmeth->verifyctx) 183 vctx = 1; 184 else 185 vctx = 0; 186 EVP_MD_CTX_init(&tmp_ctx); 187 if (!EVP_MD_CTX_copy_ex(&tmp_ctx,ctx)) 188 return -1; 189 if (vctx) 190 { 191 r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, 192 sig, siglen, &tmp_ctx); 193 } 194 else 195 r = EVP_DigestFinal_ex(&tmp_ctx,md,&mdlen); 196 EVP_MD_CTX_cleanup(&tmp_ctx); 197 if (vctx || !r) 198 return r; 199 return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen); 200 } 201
