/*

 * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (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

 */

#if !defined(OPENSSL_NO_MD5)

# include <openssl/evp.h>

# include <openssl/objects.h>

# include <openssl/x509.h>

# include <openssl/md5.h>

# include <openssl/sha.h>

# include "internal/cryptlib.h"

# include "crypto/evp.h"

# include <openssl/rsa.h>

struct md5_sha1_ctx {

    MD5_CTX md5;

    SHA_CTX sha1;

};

static int init(EVP_MD_CTX *ctx)

{

    struct md5_sha1_ctx *mctx = EVP_MD_CTX_md_data(ctx);

    if (!MD5_Init(&mctx->md5))

        return 0;

    return SHA1_Init(&mctx->sha1);

}

static int update(EVP_MD_CTX *ctx, const void *data, size_t count)

{

    struct md5_sha1_ctx *mctx = EVP_MD_CTX_md_data(ctx);

    if (!MD5_Update(&mctx->md5, data, count))

        return 0;

    return SHA1_Update(&mctx->sha1, data, count);

}

static int final(EVP_MD_CTX *ctx, unsigned char *md)

{

    struct md5_sha1_ctx *mctx = EVP_MD_CTX_md_data(ctx);

    if (!MD5_Final(md, &mctx->md5))

        return 0;

    return SHA1_Final(md + MD5_DIGEST_LENGTH, &mctx->sha1);

}

static int ctrl(EVP_MD_CTX *ctx, int cmd, int mslen, void *ms)

{

    unsigned char padtmp[48];

    unsigned char md5tmp[MD5_DIGEST_LENGTH];

    unsigned char sha1tmp[SHA_DIGEST_LENGTH];

    struct md5_sha1_ctx *mctx;

    if (cmd != EVP_CTRL_SSL3_MASTER_SECRET)

        return -2;

    if (ctx == NULL)

        return 0;

    mctx = EVP_MD_CTX_md_data(ctx);

    /* 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 (update(ctx, ms, mslen) <= 0)

        return 0;

    /* Set padtmp to pad_1 value */

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

    if (!MD5_Update(&mctx->md5, padtmp, sizeof(padtmp)))

        return 0;

    if (!MD5_Final(md5tmp, &mctx->md5))

        return 0;

    if (!SHA1_Update(&mctx->sha1, padtmp, 40))

        return 0;

    if (!SHA1_Final(sha1tmp, &mctx->sha1))

        return 0;

    /* Reinitialise context */

    if (!init(ctx))

        return 0;

    if (update(ctx, ms, mslen) <= 0)

        return 0;

    /* Set padtmp to pad_2 value */

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

    if (!MD5_Update(&mctx->md5, padtmp, sizeof(padtmp)))

        return 0;

    if (!MD5_Update(&mctx->md5, md5tmp, sizeof(md5tmp)))

        return 0;

    if (!SHA1_Update(&mctx->sha1, padtmp, 40))

        return 0;

    if (!SHA1_Update(&mctx->sha1, sha1tmp, sizeof(sha1tmp)))

        return 0;

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

    OPENSSL_cleanse(md5tmp, sizeof(md5tmp));

    OPENSSL_cleanse(sha1tmp, sizeof(sha1tmp));

    return 1;

}

static const EVP_MD md5_sha1_md = {

    NID_md5_sha1,

    NID_md5_sha1,

    MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,

    0,

    init,

    update,

    final,

    NULL,

    NULL,

    MD5_CBLOCK,

    sizeof(EVP_MD *) + sizeof(struct md5_sha1_ctx),

    ctrl

};

const EVP_MD *EVP_md5_sha1(void)

{

    return &md5_sha1_md;

}

#endif