text: /*
   * Copyright (c) 2006 - 2008 Kungliga Tekniska Högskolan
   * (Royal Institute of Technology, Stockholm, Sweden).
   * 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 the
   *    documentation and/or other materials provided with the distribution.
   *
   * 3. Neither the name of the Institute nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #include <config.h>
  
  #define HC_DEPRECATED
  
  #include <sys/types.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <assert.h>
  
  #include <evp.h>
  
  #include <krb5-types.h>
  
  #include <aes.h>
  
  /*
   *
   */
  
  static int
  aes_init(EVP_CIPHER_CTX *ctx,
  	 const unsigned char * key,
  	 const unsigned char * iv,
  	 int encp)
  {
      AES_KEY *k = ctx->cipher_data;
      if (ctx->encrypt)
  	AES_set_encrypt_key(key, ctx->cipher->key_len * 8, k);
      else
  	AES_set_decrypt_key(key, ctx->cipher->key_len * 8, k);
      return 1;
  }
  
  static int
  aes_do_cipher(EVP_CIPHER_CTX *ctx,
  	      unsigned char *out,
  	      const unsigned char *in,
  	      unsigned int size)
  {
      AES_KEY *k = ctx->cipher_data;
      AES_cbc_encrypt(in, out, size, k, ctx->iv, ctx->encrypt);
      return 1;
  }
  
  static int
  aes_cleanup(EVP_CIPHER_CTX *ctx)
  {
      memset(ctx->cipher_data, 0, sizeof(AES_KEY));
      return 1;
  }
  
  /**
   * The AES-128 cipher type (hcrypto)
   *
   * @return the AES-128 EVP_CIPHER pointer.
   *
   * @ingroup hcrypto_evp
   */
  
  const EVP_CIPHER *
  EVP_hcrypto_aes_128_cbc(void)
  {
      static const EVP_CIPHER aes_128_cbc = {
  	0,
  	16,
  	16,
  	16,
  	EVP_CIPH_CBC_MODE,
  	aes_init,
  	aes_do_cipher,
  	aes_cleanup,
  	sizeof(AES_KEY),
  	NULL,
  	NULL,
  	NULL,
  	NULL
      };
  
      return &aes_128_cbc;
  }
  
  /**
   * The AES-192 cipher type (hcrypto)
   *
   * @return the AES-192 EVP_CIPHER pointer.
   *
   * @ingroup hcrypto_evp
   */
  
  const EVP_CIPHER *
  EVP_hcrypto_aes_192_cbc(void)
  {
      static const EVP_CIPHER aes_192_cbc = {
  	0,
  	16,
  	24,
  	16,
  	EVP_CIPH_CBC_MODE,
  	aes_init,
  	aes_do_cipher,
  	aes_cleanup,
  	sizeof(AES_KEY),
  	NULL,
  	NULL,
  	NULL,
  	NULL
      };
      return &aes_192_cbc;
  }
  
  /**
   * The AES-256 cipher type (hcrypto)
   *
   * @return the AES-256 EVP_CIPHER pointer.
   *
   * @ingroup hcrypto_evp
   */
  
  const EVP_CIPHER *
  EVP_hcrypto_aes_256_cbc(void)
  {
      static const EVP_CIPHER aes_256_cbc = {
  	0,
  	16,
  	32,
  	16,
  	EVP_CIPH_CBC_MODE,
  	aes_init,
  	aes_do_cipher,
  	aes_cleanup,
  	sizeof(AES_KEY),
  	NULL,
  	NULL,
  	NULL,
  	NULL
      };
      return &aes_256_cbc;
  }
  