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      1 /*	$NetBSD: md-sha256.c,v 1.5 2017/04/18 18:41:46 christos 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 (at) 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 1.5 2017/04/18 18:41:46 christos 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 }
     77