diff options
Diffstat (limited to 'crypto/evp/e_aes.c')
| -rw-r--r-- | crypto/evp/e_aes.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/crypto/evp/e_aes.c b/crypto/evp/e_aes.c new file mode 100644 index 0000000..87983c6 --- /dev/null +++ b/crypto/evp/e_aes.c @@ -0,0 +1,153 @@ +/* ==================================================================== + * Copyright (c) 2001 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 + * the documentation and/or other materials provided with the + * 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/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * 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. + * + * 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/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED 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 OpenSSL PROJECT OR + * ITS 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 <openssl/evp.h> +#include <openssl/err.h> +#include <string.h> +#include <assert.h> + +static int aes_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc); +static int aes_ecb(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, unsigned int inl); +static int aes_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, unsigned int inl); + +#define IMPLEMENT_AES_CIPHER(name, ciph_func, keylen, ivlen, mode) \ +static EVP_CIPHER name##_cipher_st = \ + { \ + NID_##name, \ + 16,keylen,ivlen, \ + mode, \ + aes_init, \ + ciph_func, \ + NULL, \ + sizeof(EVP_CIPHER_CTX)-sizeof((((EVP_CIPHER_CTX *)NULL)->c))+ \ + sizeof((((EVP_CIPHER_CTX *)NULL)->c.rijndael)), \ + EVP_CIPHER_set_asn1_iv, \ + EVP_CIPHER_get_asn1_iv, \ + NULL, \ + NULL \ + }; \ +EVP_CIPHER * EVP_##name(void) \ + { \ + return &name##_cipher_st; \ + } + +IMPLEMENT_AES_CIPHER(aes_128_ecb, aes_ecb, 16, 0, EVP_CIPH_ECB_MODE) +IMPLEMENT_AES_CIPHER(aes_192_ecb, aes_ecb, 24, 0, EVP_CIPH_ECB_MODE) +IMPLEMENT_AES_CIPHER(aes_256_ecb, aes_ecb, 32, 0, EVP_CIPH_ECB_MODE) + +IMPLEMENT_AES_CIPHER(aes_128_cbc, aes_cbc, 16, 16, EVP_CIPH_CBC_MODE) +IMPLEMENT_AES_CIPHER(aes_192_cbc, aes_cbc, 24, 24, EVP_CIPH_CBC_MODE) +IMPLEMENT_AES_CIPHER(aes_256_cbc, aes_cbc, 32, 32, EVP_CIPH_CBC_MODE) + +static int aes_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc) + { + RIJNDAEL_KEY *k=&ctx->c.rijndael; + if (enc) + k->rounds = rijndaelKeySetupEnc(k->rd_key, key, ctx->key_len * 8); + else + k->rounds = rijndaelKeySetupDec(k->rd_key, key, ctx->key_len * 8); + + return 1; + } + +static int aes_ecb(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, unsigned int inl) + { + RIJNDAEL_KEY *k=&ctx->c.rijndael; + while(inl > 0) + { + if(ctx->encrypt) + rijndaelEncrypt(k->rd_key,k->rounds, in, out); + else + rijndaelDecrypt(k->rd_key,k->rounds, in, out); + inl-=16; + in+=16; + out+=16; + } + assert(inl == 0); + + return 1; + } + +static int aes_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, unsigned int inl) + { + int n; + unsigned char tmp[16]; + RIJNDAEL_KEY *k=&ctx->c.rijndael; + while(inl > 0) + { + if(ctx->encrypt) + { + for(n=0 ; n < 16 ; n++) + tmp[n] = in[n] ^ ctx->iv[n]; + rijndaelEncrypt(k->rd_key,k->rounds, tmp, out); + memcpy(ctx->iv,out,16); + } + else + { + memcpy(tmp, in, 16); + rijndaelDecrypt(k->rd_key,k->rounds, in, out); + for(n=0 ; n < 16 ; n++) + out[n] ^= ctx->iv[n]; + memcpy(ctx->iv,tmp,16); + } + inl-=16; + in+=16; + out+=16; + } + assert(inl == 0); + return 1; + } + |