crypto/external/bsd/openssh/dist/md-sha256.c

   1 /*      $NetBSD: md-sha256.c,v 1.3 2006/10/28 23:07:23 agc Exp $        */
   2 /* $OpenBSD: md-sha256.c,v 1.5 2006/08/03 03:34:42 deraadt Exp $ */
   3 /*
   4  * Copyright (c) 2005 Damien Miller <djm@openbsd.org>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 /* EVP wrapper for SHA256 */
  20 #include "includes.h"
  21 __RCSID("$NetBSD: md-sha256.c,v 1.3 2006/10/28 23:07:23 agc Exp $");
  22
  23 #include <sys/types.h>
  24
  25 #include <openssl/evp.h>
  26
  27 #include <sys/sha2.h>
  28 #include <string.h>
  29
  30 const EVP_MD *evp_ssh_sha256(void);
  31
  32 static int
  33 ssh_sha256_init(EVP_MD_CTX *ctxt)
  34 {
  35         SHA256_Init(ctxt->md_data);
  36         return (1);
  37 }
  38
  39 static int
  40 ssh_sha256_update(EVP_MD_CTX *ctxt, const void *data, size_t len)
  41 {
  42         SHA256_Update(ctxt->md_data, data, len);
  43         return (1);
  44 }
  45
  46 static int
  47 ssh_sha256_final(EVP_MD_CTX *ctxt, unsigned char *digest)
  48 {
  49         SHA256_Final(digest, ctxt->md_data);
  50         return (1);
  51 }
  52
  53 static int
  54 ssh_sha256_cleanup(EVP_MD_CTX *ctxt)
  55 {
  56         memset(ctxt->md_data, 0, sizeof(SHA256_CTX));
  57         return (1);
  58 }
  59
  60 const EVP_MD *
  61 evp_ssh_sha256(void)
  62 {
  63         static EVP_MD ssh_sha256;
  64
  65         memset(&ssh_sha256, 0, sizeof(ssh_sha256));
  66         ssh_sha256.type = NID_undef;
  67         ssh_sha256.md_size = SHA256_DIGEST_LENGTH;
  68         ssh_sha256.init = ssh_sha256_init;
  69         ssh_sha256.update = ssh_sha256_update;
  70         ssh_sha256.final = ssh_sha256_final;
  71         ssh_sha256.cleanup = ssh_sha256_cleanup;
  72         ssh_sha256.block_size = SHA256_BLOCK_LENGTH;
  73         ssh_sha256.ctx_size = sizeof(SHA256_CTX);
  74
  75         return (&ssh_sha256);
  76 }