/*
 * Copyright 2001-2020 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
 */

/*
 * This file uses the low level AES functions (which are deprecated for
 * non-internal use) in order to implement provider AES ciphers.
 */
#include "internal/deprecated.h"

#include "cipher_aes.h"
#include "prov/providercommonerr.h"

static int cipher_hw_aes_initkey(PROV_CIPHER_CTX *dat,
                                 const unsigned char *key, size_t keylen)
{
    int ret;
    PROV_AES_CTX *adat = (PROV_AES_CTX *)dat;
    AES_KEY *ks = &adat->ks.ks;

    dat->ks = ks;

    if ((dat->mode == EVP_CIPH_ECB_MODE || dat->mode == EVP_CIPH_CBC_MODE)
        && !dat->enc) {
#ifdef HWAES_CAPABLE
        if (HWAES_CAPABLE) {
            ret = HWAES_set_decrypt_key(key, keylen * 8, ks);
            dat->block = (block128_f)HWAES_decrypt;
            dat->stream.cbc = NULL;
# ifdef HWAES_cbc_encrypt
            if (dat->mode == EVP_CIPH_CBC_MODE)
                dat->stream.cbc = (cbc128_f)HWAES_cbc_encrypt;
# endif
# ifdef HWAES_ecb_encrypt
            if (dat->mode == EVP_CIPH_ECB_MODE)
                dat->stream.ecb = (ecb128_f)HWAES_ecb_encrypt;
# endif
        } else
#endif
#ifdef BSAES_CAPABLE
        if (BSAES_CAPABLE && dat->mode == EVP_CIPH_CBC_MODE) {
            ret = AES_set_decrypt_key(key, keylen * 8, ks);
            dat->block = (block128_f)AES_decrypt;
            dat->stream.cbc = (cbc128_f)bsaes_cbc_encrypt;
        } else
#endif
#ifdef VPAES_CAPABLE
        if (VPAES_CAPABLE) {
            ret = vpaes_set_decrypt_key(key, keylen * 8, ks);
            dat->block = (block128_f)vpaes_decrypt;
            dat->stream.cbc = (dat->mode == EVP_CIPH_CBC_MODE)
                              ?(cbc128_f)vpaes_cbc_encrypt : NULL;
        } else
#endif
        {
            ret = AES_set_decrypt_key(key, keylen * 8, ks);
            dat->block = (block128_f)AES_decrypt;
            dat->stream.cbc = (dat->mode == EVP_CIPH_CBC_MODE)
                              ? (cbc128_f)AES_cbc_encrypt : NULL;
        }
    } else
#ifdef HWAES_CAPABLE
    if (HWAES_CAPABLE) {
        ret = HWAES_set_encrypt_key(key, keylen * 8, ks);
        dat->block = (block128_f)HWAES_encrypt;
        dat->stream.cbc = NULL;
# ifdef HWAES_cbc_encrypt
        if (dat->mode == EVP_CIPH_CBC_MODE)
            dat->stream.cbc = (cbc128_f)HWAES_cbc_encrypt;
        else
# endif
# ifdef HWAES_ecb_encrypt
        if (dat->mode == EVP_CIPH_ECB_MODE)
            dat->stream.ecb = (ecb128_f)HWAES_ecb_encrypt;
        else
# endif
# ifdef HWAES_ctr32_encrypt_blocks
        if (dat->mode == EVP_CIPH_CTR_MODE)
            dat->stream.ctr = (ctr128_f)HWAES_ctr32_encrypt_blocks;
        else
# endif
            (void)0;            /* terminate potentially open 'else' */
    } else
#endif
#ifdef BSAES_CAPABLE
    if (BSAES_CAPABLE && dat->mode == EVP_CIPH_CTR_MODE) {
        ret = AES_set_encrypt_key(key, keylen * 8, ks);
        dat->block = (block128_f)AES_encrypt;
        dat->stream.ctr = (ctr128_f)bsaes_ctr32_encrypt_blocks;
    } else
#endif
#ifdef VPAES_CAPABLE
    if (VPAES_CAPABLE) {
        ret = vpaes_set_encrypt_key(key, keylen * 8, ks);
        dat->block = (block128_f)vpaes_encrypt;
        dat->stream.cbc = (dat->mode == EVP_CIPH_CBC_MODE)
                          ? (cbc128_f)vpaes_cbc_encrypt : NULL;
    } else
#endif
    {
        ret = AES_set_encrypt_key(key, keylen * 8, ks);
        dat->block = (block128_f)AES_encrypt;
        dat->stream.cbc = (dat->mode == EVP_CIPH_CBC_MODE)
                          ? (cbc128_f)AES_cbc_encrypt : NULL;
#ifdef AES_CTR_ASM
        if (dat->mode == EVP_CIPH_CTR_MODE)
            dat->stream.ctr = (ctr128_f)AES_ctr32_encrypt;
#endif
    }

    if (ret < 0) {
        ERR_raise(ERR_LIB_PROV, PROV_R_AES_KEY_SETUP_FAILED);
        return 0;
    }

    return 1;
}

IMPLEMENT_CIPHER_HW_COPYCTX(cipher_hw_aes_copyctx, PROV_AES_CTX)

#define PROV_CIPHER_HW_aes_mode(mode)                                          \
static const PROV_CIPHER_HW aes_##mode = {                                     \
    cipher_hw_aes_initkey,                                                     \
    cipher_hw_generic_##mode,                                                  \
    cipher_hw_aes_copyctx                                                      \
};                                                                             \
PROV_CIPHER_HW_declare(mode)                                                   \
const PROV_CIPHER_HW *PROV_CIPHER_HW_aes_##mode(size_t keybits)                \
{                                                                              \
    PROV_CIPHER_HW_select(mode)                                                \
    return &aes_##mode;                                                        \
}

#if defined(AESNI_CAPABLE)
# include "cipher_aes_hw_aesni.inc"
#elif defined(SPARC_AES_CAPABLE)
# include "cipher_aes_hw_t4.inc"
#elif defined(S390X_aes_128_CAPABLE)
# include "cipher_aes_hw_s390x.inc"
#else
/* The generic case */
# define PROV_CIPHER_HW_declare(mode)
# define PROV_CIPHER_HW_select(mode)
#endif

PROV_CIPHER_HW_aes_mode(cbc)
PROV_CIPHER_HW_aes_mode(ecb)
PROV_CIPHER_HW_aes_mode(ofb128)
PROV_CIPHER_HW_aes_mode(cfb128)
PROV_CIPHER_HW_aes_mode(cfb1)
PROV_CIPHER_HW_aes_mode(cfb8)
PROV_CIPHER_HW_aes_mode(ctr)