1 /* $OpenBSD: md-sha256.c,v 1.5 2006/08/03 03:34:42 deraadt Exp $ */ 2 /* 3 * Copyright (c) 2005 Damien Miller <djm (at) openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 /* EVP wrapper for SHA256 */ 19 20 #include "includes.h" 21 22 #include <sys/types.h> 23 #include <openssl/opensslv.h> 24 25 #if !defined(HAVE_EVP_SHA256) && (OPENSSL_VERSION_NUMBER >= 0x00907000L) 26 27 #include <string.h> 28 #include <openssl/evp.h> 29 #ifdef HAVE_SHA256_UPDATE 30 # ifdef HAVE_SHA2_H 31 # include <sha2.h> 32 # elif defined(HAVE_CRYPTO_SHA2_H) 33 # include <crypto/sha2.h> 34 # endif 35 #endif 36 37 const EVP_MD *evp_ssh_sha256(void); 38 39 static int 40 ssh_sha256_init(EVP_MD_CTX *ctxt) 41 { 42 SHA256_Init(ctxt->md_data); 43 return (1); 44 } 45 46 static int 47 ssh_sha256_update(EVP_MD_CTX *ctxt, const void *data, unsigned long len) 48 { 49 SHA256_Update(ctxt->md_data, data, len); 50 return (1); 51 } 52 53 static int 54 ssh_sha256_final(EVP_MD_CTX *ctxt, unsigned char *digest) 55 { 56 SHA256_Final(digest, ctxt->md_data); 57 return (1); 58 } 59 60 static int 61 ssh_sha256_cleanup(EVP_MD_CTX *ctxt) 62 { 63 memset(ctxt->md_data, 0, sizeof(SHA256_CTX)); 64 return (1); 65 } 66 67 const EVP_MD * 68 evp_ssh_sha256(void) 69 { 70 static EVP_MD ssh_sha256; 71 72 memset(&ssh_sha256, 0, sizeof(ssh_sha256)); 73 ssh_sha256.type = NID_undef; 74 ssh_sha256.md_size = SHA256_DIGEST_LENGTH; 75 ssh_sha256.init = ssh_sha256_init; 76 ssh_sha256.update = ssh_sha256_update; 77 ssh_sha256.final = ssh_sha256_final; 78 ssh_sha256.cleanup = ssh_sha256_cleanup; 79 ssh_sha256.block_size = SHA256_BLOCK_LENGTH; 80 ssh_sha256.ctx_size = sizeof(SHA256_CTX); 81 82 return (&ssh_sha256); 83 } 84 85 #endif /* !defined(HAVE_EVP_SHA256) && (OPENSSL_VERSION_NUMBER >= 0x00907000L) */ 86 87
