1 /* m_sigver.c */ 2 /* 3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project 4 * 2006. 5 */ 6 /* ==================================================================== 7 * Copyright (c) 2006,2007 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * licensing@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59 60 #include <stdio.h> 61 #include "cryptlib.h" 62 #include <openssl/evp.h> 63 #include <openssl/objects.h> 64 #include <openssl/x509.h> 65 #include "evp_locl.h" 66 67 static int do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 68 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey, 69 int ver) 70 { 71 if (ctx->pctx == NULL) 72 ctx->pctx = EVP_PKEY_CTX_new(pkey, e); 73 if (ctx->pctx == NULL) 74 return 0; 75 76 if (!(ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM)) { 77 78 if (type == NULL) { 79 int def_nid; 80 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0) 81 type = EVP_get_digestbynid(def_nid); 82 } 83 84 if (type == NULL) { 85 EVPerr(EVP_F_DO_SIGVER_INIT, EVP_R_NO_DEFAULT_DIGEST); 86 return 0; 87 } 88 } 89 90 if (ver) { 91 if (ctx->pctx->pmeth->verifyctx_init) { 92 if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, ctx) <= 0) 93 return 0; 94 ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; 95 } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) 96 return 0; 97 } else { 98 if (ctx->pctx->pmeth->signctx_init) { 99 if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0) 100 return 0; 101 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; 102 } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) 103 return 0; 104 } 105 if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0) 106 return 0; 107 if (pctx) 108 *pctx = ctx->pctx; 109 if (ctx->pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) 110 return 1; 111 if (!EVP_DigestInit_ex(ctx, type, e)) 112 return 0; 113 return 1; 114 } 115 116 int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 117 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) 118 { 119 return do_sigver_init(ctx, pctx, type, e, pkey, 0); 120 } 121 122 int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, 123 const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey) 124 { 125 return do_sigver_init(ctx, pctx, type, e, pkey, 1); 126 } 127 128 int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, 129 size_t *siglen) 130 { 131 int sctx, r = 0; 132 EVP_PKEY_CTX *pctx = ctx->pctx; 133 if (pctx->pmeth->flags & EVP_PKEY_FLAG_SIGCTX_CUSTOM) { 134 EVP_PKEY_CTX *dctx; 135 if (!sigret) 136 return pctx->pmeth->signctx(pctx, sigret, siglen, ctx); 137 dctx = EVP_PKEY_CTX_dup(ctx->pctx); 138 if (!dctx) 139 return 0; 140 r = dctx->pmeth->signctx(dctx, sigret, siglen, ctx); 141 EVP_PKEY_CTX_free(dctx); 142 return r; 143 } 144 if (pctx->pmeth->signctx) 145 sctx = 1; 146 else 147 sctx = 0; 148 if (sigret) { 149 EVP_MD_CTX tmp_ctx; 150 unsigned char md[EVP_MAX_MD_SIZE]; 151 unsigned int mdlen; 152 EVP_MD_CTX_init(&tmp_ctx); 153 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) 154 return 0; 155 if (sctx) 156 r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, 157 sigret, siglen, &tmp_ctx); 158 else 159 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); 160 EVP_MD_CTX_cleanup(&tmp_ctx); 161 if (sctx || !r) 162 return r; 163 if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0) 164 return 0; 165 } else { 166 if (sctx) { 167 if (pctx->pmeth->signctx(pctx, sigret, siglen, ctx) <= 0) 168 return 0; 169 } else { 170 int s = EVP_MD_size(ctx->digest); 171 if (s < 0 || EVP_PKEY_sign(pctx, sigret, siglen, NULL, s) <= 0) 172 return 0; 173 } 174 } 175 return 1; 176 } 177 178 int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig, 179 size_t siglen) 180 { 181 EVP_MD_CTX tmp_ctx; 182 unsigned char md[EVP_MAX_MD_SIZE]; 183 int r; 184 unsigned int mdlen; 185 int vctx; 186 187 if (ctx->pctx->pmeth->verifyctx) 188 vctx = 1; 189 else 190 vctx = 0; 191 EVP_MD_CTX_init(&tmp_ctx); 192 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) 193 return -1; 194 if (vctx) { 195 r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, 196 sig, siglen, &tmp_ctx); 197 } else 198 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); 199 EVP_MD_CTX_cleanup(&tmp_ctx); 200 if (vctx || !r) 201 return r; 202 return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen); 203 } 204