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/* $OpenBSD: t1_hash.c,v 1.2 2017/05/06 16:18:36 jsing Exp $ */
/*
* Copyright (c) 2017 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "ssl_locl.h"
#include <openssl/ssl.h>
int
tls1_handshake_hash_init(SSL *s)
{
const EVP_MD *md;
long dlen;
void *data;
tls1_handshake_hash_free(s);
if (!ssl_get_handshake_evp_md(s, &md)) {
SSLerrorx(ERR_R_INTERNAL_ERROR);
goto err;
}
if ((S3I(s)->handshake_hash = EVP_MD_CTX_create()) == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_DigestInit_ex(S3I(s)->handshake_hash, md, NULL)) {
SSLerror(s, ERR_R_EVP_LIB);
goto err;
}
dlen = BIO_get_mem_data(S3I(s)->handshake_buffer, &data);
if (dlen <= 0) {
SSLerror(s, SSL_R_BAD_HANDSHAKE_LENGTH);
goto err;
}
if (!tls1_handshake_hash_update(s, data, dlen)) {
SSLerror(s, ERR_R_EVP_LIB);
goto err;
}
return 1;
err:
tls1_handshake_hash_free(s);
return 0;
}
int
tls1_handshake_hash_update(SSL *s, const unsigned char *buf, size_t len)
{
if (S3I(s)->handshake_hash == NULL)
return 1;
return EVP_DigestUpdate(S3I(s)->handshake_hash, buf, len);
}
int
tls1_handshake_hash_value(SSL *s, const unsigned char *out, size_t len,
size_t *outlen)
{
EVP_MD_CTX *mdctx = NULL;
unsigned int mdlen;
int ret = 0;
if (EVP_MD_CTX_size(S3I(s)->handshake_hash) > len)
goto err;
if ((mdctx = EVP_MD_CTX_create()) == NULL) {
SSLerror(s, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_MD_CTX_copy_ex(mdctx, S3I(s)->handshake_hash)) {
SSLerror(s, ERR_R_EVP_LIB);
goto err;
}
if (!EVP_DigestFinal_ex(mdctx, (unsigned char *)out, &mdlen)) {
SSLerror(s, ERR_R_EVP_LIB);
goto err;
}
if (outlen != NULL)
*outlen = mdlen;
ret = 1;
err:
EVP_MD_CTX_destroy(mdctx);
return (ret);
}
void
tls1_handshake_hash_free(SSL *s)
{
EVP_MD_CTX_destroy(S3I(s)->handshake_hash);
S3I(s)->handshake_hash = NULL;
}
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