/*

 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/*

 * SHA-1 low level APIs are deprecated for public use, but still ok for

 * internal use.

 */

#include "internal/deprecated.h"

#include <openssl/crypto.h>

#include <openssl/opensslconf.h>

#include <openssl/opensslv.h>

#include <openssl/evp.h>

#include <openssl/sha.h>

/* The implementation is in ../md32_common.h */

#include "sha_local.h"

#include "crypto/sha.h"

int sha1_ctrl(SHA_CTX *sha1, int cmd, int mslen, void *ms)

{

    unsigned char padtmp[40];

    unsigned char sha1tmp[SHA_DIGEST_LENGTH];

    if (cmd != EVP_CTRL_SSL3_MASTER_SECRET)

        return -2;

    if (sha1 == NULL)

        return 0;

    /* SSLv3 client auth handling: see RFC-6101 5.6.8 */

    if (mslen != 48)

        return 0;

    /* At this point hash contains all handshake messages, update

     * with master secret and pad_1.

     */

    if (SHA1_Update(sha1, ms, mslen) <= 0)

        return 0;

    /* Set padtmp to pad_1 value */

    memset(padtmp, 0x36, sizeof(padtmp));

    if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))

        return 0;

    if (!SHA1_Final(sha1tmp, sha1))

        return 0;

    /* Reinitialise context */

    if (!SHA1_Init(sha1))

        return 0;

    if (SHA1_Update(sha1, ms, mslen) <= 0)

        return 0;

    /* Set padtmp to pad_2 value */

    memset(padtmp, 0x5c, sizeof(padtmp));

    if (!SHA1_Update(sha1, padtmp, sizeof(padtmp)))

        return 0;

    if (!SHA1_Update(sha1, sha1tmp, sizeof(sha1tmp)))

        return 0;

    /* Now when ctx is finalised it will return the SSL v3 hash value */

    OPENSSL_cleanse(sha1tmp, sizeof(sha1tmp));

    return 1;

}