md-sha256.c

   1 /* $OpenBSD: md-sha256.c,v 1.5 2006/08/03 03:34:42 deraadt Exp $ */
   2 /*
   3  * Copyright (c) 2005 Damien Miller <djm@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