1 /* $OpenBSD: m_sigver.c,v 1.7 2018/05/13 06:35:10 tb Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@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@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@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 61 #include <openssl/err.h> 62 #include <openssl/evp.h> 63 #include <openssl/objects.h> 64 #include <openssl/x509.h> 65 66 #include "evp_locl.h" 67 68 static int 69 do_sigver_init(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, 70 ENGINE *e, EVP_PKEY *pkey, int ver) 71 { 72 if (ctx->pctx == NULL) 73 ctx->pctx = EVP_PKEY_CTX_new(pkey, e); 74 if (ctx->pctx == NULL) 75 return 0; 76 77 if (type == NULL) { 78 int def_nid; 79 if (EVP_PKEY_get_default_digest_nid(pkey, &def_nid) > 0) 80 type = EVP_get_digestbynid(def_nid); 81 } 82 83 if (type == NULL) { 84 EVPerror(EVP_R_NO_DEFAULT_DIGEST); 85 return 0; 86 } 87 88 if (ver) { 89 if (ctx->pctx->pmeth->verifyctx_init) { 90 if (ctx->pctx->pmeth->verifyctx_init(ctx->pctx, 91 ctx) <=0) 92 return 0; 93 ctx->pctx->operation = EVP_PKEY_OP_VERIFYCTX; 94 } else if (EVP_PKEY_verify_init(ctx->pctx) <= 0) 95 return 0; 96 } else { 97 if (ctx->pctx->pmeth->signctx_init) { 98 if (ctx->pctx->pmeth->signctx_init(ctx->pctx, ctx) <= 0) 99 return 0; 100 ctx->pctx->operation = EVP_PKEY_OP_SIGNCTX; 101 } else if (EVP_PKEY_sign_init(ctx->pctx) <= 0) 102 return 0; 103 } 104 if (EVP_PKEY_CTX_set_signature_md(ctx->pctx, type) <= 0) 105 return 0; 106 if (pctx) 107 *pctx = ctx->pctx; 108 if (!EVP_DigestInit_ex(ctx, type, e)) 109 return 0; 110 return 1; 111 } 112 113 int 114 EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, 115 ENGINE *e, EVP_PKEY *pkey) 116 { 117 return do_sigver_init(ctx, pctx, type, e, pkey, 0); 118 } 119 120 int 121 EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, 122 ENGINE *e, EVP_PKEY *pkey) 123 { 124 return do_sigver_init(ctx, pctx, type, e, pkey, 1); 125 } 126 127 int 128 EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret, size_t *siglen) 129 { 130 int sctx, r = 0; 131 132 if (ctx->pctx->pmeth->signctx) 133 sctx = 1; 134 else 135 sctx = 0; 136 if (sigret) { 137 EVP_MD_CTX tmp_ctx; 138 unsigned char md[EVP_MAX_MD_SIZE]; 139 unsigned int mdlen = 0; 140 EVP_MD_CTX_init(&tmp_ctx); 141 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) 142 return 0; 143 if (sctx) 144 r = tmp_ctx.pctx->pmeth->signctx(tmp_ctx.pctx, 145 sigret, siglen, &tmp_ctx); 146 else 147 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); 148 EVP_MD_CTX_cleanup(&tmp_ctx); 149 if (sctx || !r) 150 return r; 151 if (EVP_PKEY_sign(ctx->pctx, sigret, siglen, md, mdlen) <= 0) 152 return 0; 153 } else { 154 if (sctx) { 155 if (ctx->pctx->pmeth->signctx(ctx->pctx, sigret, 156 siglen, ctx) <= 0) 157 return 0; 158 } else { 159 int s = EVP_MD_size(ctx->digest); 160 if (s < 0 || EVP_PKEY_sign(ctx->pctx, sigret, siglen, 161 NULL, s) <= 0) 162 return 0; 163 } 164 } 165 return 1; 166 } 167 168 int 169 EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig, size_t siglen) 170 { 171 EVP_MD_CTX tmp_ctx; 172 unsigned char md[EVP_MAX_MD_SIZE]; 173 int r; 174 unsigned int mdlen = 0; 175 int vctx; 176 177 if (ctx->pctx->pmeth->verifyctx) 178 vctx = 1; 179 else 180 vctx = 0; 181 EVP_MD_CTX_init(&tmp_ctx); 182 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) 183 return -1; 184 if (vctx) { 185 r = tmp_ctx.pctx->pmeth->verifyctx(tmp_ctx.pctx, sig, 186 siglen, &tmp_ctx); 187 } else 188 r = EVP_DigestFinal_ex(&tmp_ctx, md, &mdlen); 189 EVP_MD_CTX_cleanup(&tmp_ctx); 190 if (vctx || !r) 191 return r; 192 return EVP_PKEY_verify(ctx->pctx, sig, siglen, md, mdlen); 193 } 194