1 /* $OpenBSD: p_verify.c,v 1.11 2014/06/12 15:49:29 deraadt Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 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 int 67 EVP_VerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sigbuf, 68 unsigned int siglen, EVP_PKEY *pkey) 69 { 70 unsigned char m[EVP_MAX_MD_SIZE]; 71 unsigned int m_len; 72 int i = 0, ok = 0, v; 73 EVP_MD_CTX tmp_ctx; 74 EVP_PKEY_CTX *pkctx = NULL; 75 76 EVP_MD_CTX_init(&tmp_ctx); 77 if (!EVP_MD_CTX_copy_ex(&tmp_ctx, ctx)) 78 goto err; 79 if (!EVP_DigestFinal_ex(&tmp_ctx, &(m[0]), &m_len)) 80 goto err; 81 EVP_MD_CTX_cleanup(&tmp_ctx); 82 83 if (ctx->digest->flags & EVP_MD_FLAG_PKEY_METHOD_SIGNATURE) { 84 i = -1; 85 pkctx = EVP_PKEY_CTX_new(pkey, NULL); 86 if (!pkctx) 87 goto err; 88 if (EVP_PKEY_verify_init(pkctx) <= 0) 89 goto err; 90 if (EVP_PKEY_CTX_set_signature_md(pkctx, ctx->digest) <= 0) 91 goto err; 92 i = EVP_PKEY_verify(pkctx, sigbuf, siglen, m, m_len); 93 err: 94 EVP_PKEY_CTX_free(pkctx); 95 return i; 96 } 97 98 for (i = 0; i < 4; i++) { 99 v = ctx->digest->required_pkey_type[i]; 100 if (v == 0) 101 break; 102 if (pkey->type == v) { 103 ok = 1; 104 break; 105 } 106 } 107 if (!ok) { 108 EVPerr(EVP_F_EVP_VERIFYFINAL, EVP_R_WRONG_PUBLIC_KEY_TYPE); 109 return (-1); 110 } 111 if (ctx->digest->verify == NULL) { 112 EVPerr(EVP_F_EVP_VERIFYFINAL, 113 EVP_R_NO_VERIFY_FUNCTION_CONFIGURED); 114 return (0); 115 } 116 117 return(ctx->digest->verify(ctx->digest->type, m, m_len, 118 sigbuf, siglen, pkey->pkey.ptr)); 119 } 120