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 * Copyright (c) 2002-2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
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 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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#include <openssl/aes.h>

#include <assert.h>

#include "internal.h"
#include "../modes/internal.h"


// Be aware that different sets of AES functions use incompatible key
// representations, varying in format of the key schedule, the |AES_KEY.rounds|
// value, or both. Therefore they cannot mix. Also, on AArch64, the plain-C
// code, above, is incompatible with the |aes_hw_*| functions.

void AES_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) {
  if (hwaes_capable()) {
    aes_hw_encrypt(in, out, key);
  } else if (vpaes_capable()) {
    vpaes_encrypt(in, out, key);
  } else {
    aes_nohw_encrypt(in, out, key);
  }
}

void AES_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) {
  if (hwaes_capable()) {
    aes_hw_decrypt(in, out, key);
  } else if (vpaes_capable()) {
    vpaes_decrypt(in, out, key);
  } else {
    aes_nohw_decrypt(in, out, key);
  }
}

int AES_set_encrypt_key(const uint8_t *key, unsigned bits, AES_KEY *aeskey) {
  if (bits != 128 && bits != 192 && bits != 256) {
    return -2;
  }
  if (hwaes_capable()) {
    return aes_hw_set_encrypt_key(key, bits, aeskey);
  } else if (vpaes_capable()) {
    return vpaes_set_encrypt_key(key, bits, aeskey);
  } else {
    return aes_nohw_set_encrypt_key(key, bits, aeskey);
  }
}

int AES_set_decrypt_key(const uint8_t *key, unsigned bits, AES_KEY *aeskey) {
  if (bits != 128 && bits != 192 && bits != 256) {
    return -2;
  }
  if (hwaes_capable()) {
    return aes_hw_set_decrypt_key(key, bits, aeskey);
  } else if (vpaes_capable()) {
    return vpaes_set_decrypt_key(key, bits, aeskey);
  } else {
    return aes_nohw_set_decrypt_key(key, bits, aeskey);
  }
}

#if defined(HWAES) && (defined(OPENSSL_X86) || defined(OPENSSL_X86_64))
// On x86 and x86_64, |aes_hw_set_decrypt_key|, we implement
// |aes_hw_encrypt_key_to_decrypt_key| in assembly and rely on C code to combine
// the operations.
int aes_hw_set_decrypt_key(const uint8_t *user_key, int bits, AES_KEY *key) {
  int ret = aes_hw_set_encrypt_key(user_key, bits, key);
  if (ret == 0) {
    aes_hw_encrypt_key_to_decrypt_key(key);
  }
  return ret;
}

int aes_hw_set_encrypt_key(const uint8_t *user_key, int bits, AES_KEY *key) {
  if (aes_hw_set_encrypt_key_alt_preferred()) {
    return aes_hw_set_encrypt_key_alt(user_key, bits, key);
  } else {
    return aes_hw_set_encrypt_key_base(user_key, bits, key);
  }
}
#endif
