mode_wrappers.c

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/* ====================================================================
 * Copyright (c) 2002-2006 The OpenSSL Project.  All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 *    notice, this list of conditions and the following disclaimer.
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 *    distribution.
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 *    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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 *    "This product includes software developed by the OpenSSL Project
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#include <openssl/aes.h>
 
#include <assert.h>
 
#include "../aes/internal.h"
#include "../modes/internal.h"
 
 
void AES_ctr128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
                        const AES_KEY *key, uint8_t ivec[AES_BLOCK_SIZE],
                        uint8_t ecount_buf[AES_BLOCK_SIZE], unsigned int *num) {
  if (hwaes_capable()) {
    CRYPTO_ctr128_encrypt_ctr32(in, out, len, key, ivec, ecount_buf, num,
                                aes_hw_ctr32_encrypt_blocks);
  } else if (vpaes_capable()) {
#if defined(VPAES_CTR32)
    // TODO(davidben): On ARM, where |BSAES| is additionally defined, this could
    // use |vpaes_ctr32_encrypt_blocks_with_bsaes|.
    CRYPTO_ctr128_encrypt_ctr32(in, out, len, key, ivec, ecount_buf, num,
                                vpaes_ctr32_encrypt_blocks);
#else
    CRYPTO_ctr128_encrypt(in, out, len, key, ivec, ecount_buf, num,
                          vpaes_encrypt);
#endif
  } else {
    CRYPTO_ctr128_encrypt_ctr32(in, out, len, key, ivec, ecount_buf, num,
                                aes_nohw_ctr32_encrypt_blocks);
  }
}
 
void AES_ecb_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key,
                     const int enc) {
  assert(in && out && key);
  assert((AES_ENCRYPT == enc) || (AES_DECRYPT == enc));
 
  if (AES_ENCRYPT == enc) {
    AES_encrypt(in, out, key);
  } else {
    AES_decrypt(in, out, key);
  }
}
 
void AES_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t len,
                     const AES_KEY *key, uint8_t *ivec, const int enc) {
  if (hwaes_capable()) {
    aes_hw_cbc_encrypt(in, out, len, key, ivec, enc);
    return;
  }
 
  if (!vpaes_capable()) {
    aes_nohw_cbc_encrypt(in, out, len, key, ivec, enc);
    return;
  }
  if (enc) {
    CRYPTO_cbc128_encrypt(in, out, len, key, ivec, AES_encrypt);
  } else {
    CRYPTO_cbc128_decrypt(in, out, len, key, ivec, AES_decrypt);
  }
}
 
void AES_ofb128_encrypt(const uint8_t *in, uint8_t *out, size_t length,
                        const AES_KEY *key, uint8_t *ivec, int *num) {
  unsigned num_u = (unsigned)(*num);
  CRYPTO_ofb128_encrypt(in, out, length, key, ivec, &num_u, AES_encrypt);
  *num = (int)num_u;
}
 
void AES_cfb128_encrypt(const uint8_t *in, uint8_t *out, size_t length,
                        const AES_KEY *key, uint8_t *ivec, int *num,
                        int enc) {
  unsigned num_u = (unsigned)(*num);
  CRYPTO_cfb128_encrypt(in, out, length, key, ivec, &num_u, enc, AES_encrypt);
  *num = (int)num_u;
}