/* hash.c
 *
 * Copyright (C) 2006-2015 wolfSSL Inc.
 *
 * This file is part of wolfSSL. (formerly known as CyaSSL)
 *
 * wolfSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * wolfSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */

#ifdef HAVE_CONFIG_H
    #include <config.h>
#endif

#include <wolfssl/wolfcrypt/settings.h>
#include <wolfssl/wolfcrypt/logging.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#ifndef NO_ASN
#include <wolfssl/wolfcrypt/asn.h>
#endif

#include <wolfssl/wolfcrypt/hash.h>


#ifndef NO_ASN
int wc_HashGetOID(enum wc_HashType hash_type)
{
    int oid = HASH_TYPE_E; /* Default to hash type error */
    switch(hash_type)
    {
        case WC_HASH_TYPE_MD2:
#ifdef WOLFSSL_MD2
            oid = MD2h;
#endif
            break;
        case WC_HASH_TYPE_MD5:
#ifndef NO_MD5
            oid = MD5h;
#endif
            break;
        case WC_HASH_TYPE_SHA:
#ifndef NO_SHA
            oid = SHAh;
#endif
            break;
        case WC_HASH_TYPE_SHA256:
#ifndef NO_SHA256
            oid = SHA256h;
#endif
            break;
        case WC_HASH_TYPE_SHA384:
#if defined(WOLFSSL_SHA512) && defined(WOLFSSL_SHA384)
            oid = SHA384h;
#endif
            break;
        case WC_HASH_TYPE_SHA512:
#ifdef WOLFSSL_SHA512
            oid = SHA512h;
#endif
            break;

        /* Not Supported */
        case WC_HASH_TYPE_MD4:
        case WC_HASH_TYPE_NONE:
        default:
            oid = BAD_FUNC_ARG;
            break;
    }
    return oid;
}
#endif

/* Get Hash digest size */
int wc_HashGetDigestSize(enum wc_HashType hash_type)
{
    int dig_size = HASH_TYPE_E; /* Default to hash type error */
    switch(hash_type)
    {
        case WC_HASH_TYPE_MD5:
#ifndef NO_MD5
            dig_size = MD5_DIGEST_SIZE;
#endif
            break;
        case WC_HASH_TYPE_SHA:
#ifndef NO_SHA
            dig_size = SHA_DIGEST_SIZE;
#endif
            break;
        case WC_HASH_TYPE_SHA256:
#ifndef NO_SHA256
            dig_size = SHA256_DIGEST_SIZE;
#endif
            break;
        case WC_HASH_TYPE_SHA384:
#if defined(WOLFSSL_SHA512) && defined(WOLFSSL_SHA384)
            dig_size = SHA384_DIGEST_SIZE;
#endif
            break;
        case WC_HASH_TYPE_SHA512:
#ifdef WOLFSSL_SHA512
            dig_size = SHA512_DIGEST_SIZE;
#endif
            break;

        /* Not Supported */
        case WC_HASH_TYPE_MD2:
        case WC_HASH_TYPE_MD4:
        case WC_HASH_TYPE_NONE:
        default:
            dig_size = BAD_FUNC_ARG;
            break;
    }
    return dig_size;
}

/* Generic Hashing Wrapper */
int wc_Hash(enum wc_HashType hash_type, const byte* data,
    word32 data_len, byte* hash, word32 hash_len)
{
    int ret = HASH_TYPE_E; /* Default to hash type error */
    word32 dig_size;

    /* Validate hash buffer size */
    dig_size = wc_HashGetDigestSize(hash_type);
    if (hash_len < dig_size) {
        return BUFFER_E;
    }
    
    /* Suppress possible unused arg if all hashing is disabled */
    (void)data;
    (void)data_len;
    (void)hash;
    (void)hash_len;

    switch(hash_type)
    {
        case WC_HASH_TYPE_MD5:
#ifndef NO_MD5
            ret = wc_Md5Hash(data, data_len, hash);
#endif
            break;
        case WC_HASH_TYPE_SHA:
#ifndef NO_SHA
            ret = wc_ShaHash(data, data_len, hash);
#endif
            break;
        case WC_HASH_TYPE_SHA256:
#ifndef NO_SHA256
            ret = wc_Sha256Hash(data, data_len, hash);
#endif
            break;
        case WC_HASH_TYPE_SHA384:
#if defined(WOLFSSL_SHA512) && defined(WOLFSSL_SHA384)
            ret = wc_Sha384Hash(data, data_len, hash);
#endif
            break;
        case WC_HASH_TYPE_SHA512:
#ifdef WOLFSSL_SHA512
            ret = wc_Sha512Hash(data, data_len, hash);
#endif
            break;

        /* Not Supported */
        case WC_HASH_TYPE_MD2:
        case WC_HASH_TYPE_MD4:
        case WC_HASH_TYPE_NONE:
        default:
            ret = BAD_FUNC_ARG;
            break;
    }
    return ret;
}


#if !defined(WOLFSSL_TI_HASH)

#if !defined(NO_MD5)
void wc_Md5GetHash(Md5* md5, byte* hash)
{
    Md5 save = *md5 ;
    wc_Md5Final(md5, hash) ;
    *md5 = save ;
}

WOLFSSL_API void wc_Md5RestorePos(Md5* m1, Md5* m2) {
    *m1 = *m2 ;
}

#endif

#if !defined(NO_SHA)
int wc_ShaGetHash(Sha* sha, byte* hash)
{
    int ret ;
    Sha save = *sha ;
    ret = wc_ShaFinal(sha, hash) ;
    *sha = save ;
    return ret ;
}

void wc_ShaRestorePos(Sha* s1, Sha* s2) {
    *s1 = *s2 ;
}

int wc_ShaHash(const byte* data, word32 len, byte* hash)
{
    int ret = 0;
#ifdef WOLFSSL_SMALL_STACK
    Sha* sha;
#else
    Sha sha[1];
#endif

#ifdef WOLFSSL_SMALL_STACK
    sha = (Sha*)XMALLOC(sizeof(Sha), NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (sha == NULL)
        return MEMORY_E;
#endif

    if ((ret = wc_InitSha(sha)) != 0) {
        WOLFSSL_MSG("wc_InitSha failed");
    }
    else {
        wc_ShaUpdate(sha, data, len);
        wc_ShaFinal(sha, hash);
    }

#ifdef WOLFSSL_SMALL_STACK
    XFREE(sha, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif

    return ret;

}

#endif /* !defined(NO_SHA) */

#if !defined(NO_SHA256)
int wc_Sha256GetHash(Sha256* sha256, byte* hash)
{
    int ret ;
    Sha256 save = *sha256 ;
    ret = wc_Sha256Final(sha256, hash) ;
    *sha256 = save ;
    return ret ;
}

void wc_Sha256RestorePos(Sha256* s1, Sha256* s2) {
    *s1 = *s2 ;
}

int wc_Sha256Hash(const byte* data, word32 len, byte* hash)
{
    int ret = 0;
#ifdef WOLFSSL_SMALL_STACK
    Sha256* sha256;
#else
    Sha256 sha256[1];
#endif

#ifdef WOLFSSL_SMALL_STACK
    sha256 = (Sha256*)XMALLOC(sizeof(Sha256), NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (sha256 == NULL)
        return MEMORY_E;
#endif

    if ((ret = wc_InitSha256(sha256)) != 0) {
        WOLFSSL_MSG("InitSha256 failed");
    }
    else if ((ret = wc_Sha256Update(sha256, data, len)) != 0) {
        WOLFSSL_MSG("Sha256Update failed");
    }
    else if ((ret = wc_Sha256Final(sha256, hash)) != 0) {
        WOLFSSL_MSG("Sha256Final failed");
    }

#ifdef WOLFSSL_SMALL_STACK
    XFREE(sha256, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif

    return ret;
}

#endif /* !defined(NO_SHA256) */

#endif /* !defined(WOLFSSL_TI_HASH) */

#if defined(WOLFSSL_SHA512)
int wc_Sha512Hash(const byte* data, word32 len, byte* hash)
{
    int ret = 0;
#ifdef WOLFSSL_SMALL_STACK
    Sha512* sha512;
#else
    Sha512 sha512[1];
#endif

#ifdef WOLFSSL_SMALL_STACK
    sha512 = (Sha512*)XMALLOC(sizeof(Sha512), NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (sha512 == NULL)
        return MEMORY_E;
#endif

    if ((ret = wc_InitSha512(sha512)) != 0) {
        WOLFSSL_MSG("InitSha512 failed");
    }
    else if ((ret = wc_Sha512Update(sha512, data, len)) != 0) {
        WOLFSSL_MSG("Sha512Update failed");
    }
    else if ((ret = wc_Sha512Final(sha512, hash)) != 0) {
        WOLFSSL_MSG("Sha512Final failed");
    }

#ifdef WOLFSSL_SMALL_STACK
    XFREE(sha512, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif

    return ret;
}

#if defined(WOLFSSL_SHA384)
int wc_Sha384Hash(const byte* data, word32 len, byte* hash)
{
    int ret = 0;
#ifdef WOLFSSL_SMALL_STACK
    Sha384* sha384;
#else
    Sha384 sha384[1];
#endif

#ifdef WOLFSSL_SMALL_STACK
    sha384 = (Sha384*)XMALLOC(sizeof(Sha384), NULL, DYNAMIC_TYPE_TMP_BUFFER);
    if (sha384 == NULL)
        return MEMORY_E;
#endif

    if ((ret = wc_InitSha384(sha384)) != 0) {
        WOLFSSL_MSG("InitSha384 failed");
    }
    else if ((ret = wc_Sha384Update(sha384, data, len)) != 0) {
        WOLFSSL_MSG("Sha384Update failed");
    }
    else if ((ret = wc_Sha384Final(sha384, hash)) != 0) {
        WOLFSSL_MSG("Sha384Final failed");
    }

#ifdef WOLFSSL_SMALL_STACK
    XFREE(sha384, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif

    return ret;
}

#endif /* defined(WOLFSSL_SHA384) */
#endif /* defined(WOLFSSL_SHA512) */
