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Diffstat (limited to 'crypto/aes/aes_ige.c')
| -rw-r--r-- | crypto/aes/aes_ige.c | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/crypto/aes/aes_ige.c b/crypto/aes/aes_ige.c new file mode 100644 index 000000000000..2082d060cf94 --- /dev/null +++ b/crypto/aes/aes_ige.c @@ -0,0 +1,283 @@ +/* crypto/aes/aes_ige.c -*- mode:C; c-file-style: "eay" -*- */ +/* ==================================================================== + * Copyright (c) 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 + * 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 "cryptlib.h" + +#include <openssl/aes.h> +#include "aes_locl.h" + +/* +static void hexdump(FILE *f,const char *title,const unsigned char *s,int l) + { + int n=0; + + fprintf(f,"%s",title); + for( ; n < l ; ++n) + { + if((n%16) == 0) + fprintf(f,"\n%04x",n); + fprintf(f," %02x",s[n]); + } + fprintf(f,"\n"); + } +*/ + +/* N.B. The IV for this mode is _twice_ the block size */ + +void AES_ige_encrypt(const unsigned char *in, unsigned char *out, + const unsigned long length, const AES_KEY *key, + unsigned char *ivec, const int enc) + { + unsigned long n; + unsigned long len = length; + unsigned char tmp[AES_BLOCK_SIZE]; + unsigned char tmp2[AES_BLOCK_SIZE]; + unsigned char prev[AES_BLOCK_SIZE]; + const unsigned char *iv = ivec; + const unsigned char *iv2 = ivec + AES_BLOCK_SIZE; + + OPENSSL_assert(in && out && key && ivec); + OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc)); + OPENSSL_assert((length%AES_BLOCK_SIZE) == 0); + + if (AES_ENCRYPT == enc) + { + /* XXX: Do a separate case for when in != out (strictly should + check for overlap, too) */ + while (len >= AES_BLOCK_SIZE) + { + /* hexdump(stdout, "in", in, AES_BLOCK_SIZE); */ + /* hexdump(stdout, "iv", iv, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + out[n] = in[n] ^ iv[n]; + /* hexdump(stdout, "in ^ iv", out, AES_BLOCK_SIZE); */ + AES_encrypt(out, out, key); + /* hexdump(stdout,"enc", out, AES_BLOCK_SIZE); */ + /* hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + out[n] ^= iv2[n]; + /* hexdump(stdout,"out", out, AES_BLOCK_SIZE); */ + iv = out; + memcpy(prev, in, AES_BLOCK_SIZE); + iv2 = prev; + len -= AES_BLOCK_SIZE; + in += AES_BLOCK_SIZE; + out += AES_BLOCK_SIZE; + } + memcpy(ivec, iv, AES_BLOCK_SIZE); + memcpy(ivec + AES_BLOCK_SIZE, iv2, AES_BLOCK_SIZE); + } + else + { + while (len >= AES_BLOCK_SIZE) + { + memcpy(tmp, in, AES_BLOCK_SIZE); + memcpy(tmp2, in, AES_BLOCK_SIZE); + /* hexdump(stdout, "in", in, AES_BLOCK_SIZE); */ + /* hexdump(stdout, "iv2", iv2, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + tmp[n] ^= iv2[n]; + /* hexdump(stdout, "in ^ iv2", tmp, AES_BLOCK_SIZE); */ + AES_decrypt(tmp, out, key); + /* hexdump(stdout, "dec", out, AES_BLOCK_SIZE); */ + /* hexdump(stdout, "iv", ivec, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + out[n] ^= ivec[n]; + /* hexdump(stdout, "out", out, AES_BLOCK_SIZE); */ + memcpy(ivec, tmp2, AES_BLOCK_SIZE); + iv2 = out; + len -= AES_BLOCK_SIZE; + in += AES_BLOCK_SIZE; + out += AES_BLOCK_SIZE; + } + memcpy(ivec + AES_BLOCK_SIZE, iv2, AES_BLOCK_SIZE); + } + } + +/* + * Note that its effectively impossible to do biIGE in anything other + * than a single pass, so no provision is made for chaining. + */ + +/* N.B. The IV for this mode is _four times_ the block size */ + +void AES_bi_ige_encrypt(const unsigned char *in, unsigned char *out, + const unsigned long length, const AES_KEY *key, + const AES_KEY *key2, const unsigned char *ivec, + const int enc) + { + unsigned long n; + unsigned long len = length; + unsigned char tmp[AES_BLOCK_SIZE]; + unsigned char tmp2[AES_BLOCK_SIZE]; + unsigned char tmp3[AES_BLOCK_SIZE]; + unsigned char prev[AES_BLOCK_SIZE]; + const unsigned char *iv; + const unsigned char *iv2; + + OPENSSL_assert(in && out && key && ivec); + OPENSSL_assert((AES_ENCRYPT == enc)||(AES_DECRYPT == enc)); + OPENSSL_assert((length%AES_BLOCK_SIZE) == 0); + + if (AES_ENCRYPT == enc) + { + /* XXX: Do a separate case for when in != out (strictly should + check for overlap, too) */ + + /* First the forward pass */ + iv = ivec; + iv2 = ivec + AES_BLOCK_SIZE; + while (len >= AES_BLOCK_SIZE) + { + /* hexdump(stdout, "in", in, AES_BLOCK_SIZE); */ + /* hexdump(stdout, "iv", iv, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + out[n] = in[n] ^ iv[n]; + /* hexdump(stdout, "in ^ iv", out, AES_BLOCK_SIZE); */ + AES_encrypt(out, out, key); + /* hexdump(stdout,"enc", out, AES_BLOCK_SIZE); */ + /* hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + out[n] ^= iv2[n]; + /* hexdump(stdout,"out", out, AES_BLOCK_SIZE); */ + iv = out; + memcpy(prev, in, AES_BLOCK_SIZE); + iv2 = prev; + len -= AES_BLOCK_SIZE; + in += AES_BLOCK_SIZE; + out += AES_BLOCK_SIZE; + } + + /* And now backwards */ + iv = ivec + AES_BLOCK_SIZE*2; + iv2 = ivec + AES_BLOCK_SIZE*3; + len = length; + while(len >= AES_BLOCK_SIZE) + { + out -= AES_BLOCK_SIZE; + /* hexdump(stdout, "intermediate", out, AES_BLOCK_SIZE); */ + /* hexdump(stdout, "iv", iv, AES_BLOCK_SIZE); */ + /* XXX: reduce copies by alternating between buffers */ + memcpy(tmp, out, AES_BLOCK_SIZE); + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + out[n] ^= iv[n]; + /* hexdump(stdout, "out ^ iv", out, AES_BLOCK_SIZE); */ + AES_encrypt(out, out, key); + /* hexdump(stdout,"enc", out, AES_BLOCK_SIZE); */ + /* hexdump(stdout,"iv2", iv2, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + out[n] ^= iv2[n]; + /* hexdump(stdout,"out", out, AES_BLOCK_SIZE); */ + iv = out; + memcpy(prev, tmp, AES_BLOCK_SIZE); + iv2 = prev; + len -= AES_BLOCK_SIZE; + } + } + else + { + /* First backwards */ + iv = ivec + AES_BLOCK_SIZE*2; + iv2 = ivec + AES_BLOCK_SIZE*3; + in += length; + out += length; + while (len >= AES_BLOCK_SIZE) + { + in -= AES_BLOCK_SIZE; + out -= AES_BLOCK_SIZE; + memcpy(tmp, in, AES_BLOCK_SIZE); + memcpy(tmp2, in, AES_BLOCK_SIZE); + /* hexdump(stdout, "in", in, AES_BLOCK_SIZE); */ + /* hexdump(stdout, "iv2", iv2, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + tmp[n] ^= iv2[n]; + /* hexdump(stdout, "in ^ iv2", tmp, AES_BLOCK_SIZE); */ + AES_decrypt(tmp, out, key); + /* hexdump(stdout, "dec", out, AES_BLOCK_SIZE); */ + /* hexdump(stdout, "iv", iv, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + out[n] ^= iv[n]; + /* hexdump(stdout, "out", out, AES_BLOCK_SIZE); */ + memcpy(tmp3, tmp2, AES_BLOCK_SIZE); + iv = tmp3; + iv2 = out; + len -= AES_BLOCK_SIZE; + } + + /* And now forwards */ + iv = ivec; + iv2 = ivec + AES_BLOCK_SIZE; + len = length; + while (len >= AES_BLOCK_SIZE) + { + memcpy(tmp, out, AES_BLOCK_SIZE); + memcpy(tmp2, out, AES_BLOCK_SIZE); + /* hexdump(stdout, "intermediate", out, AES_BLOCK_SIZE); */ + /* hexdump(stdout, "iv2", iv2, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + tmp[n] ^= iv2[n]; + /* hexdump(stdout, "out ^ iv2", tmp, AES_BLOCK_SIZE); */ + AES_decrypt(tmp, out, key); + /* hexdump(stdout, "dec", out, AES_BLOCK_SIZE); */ + /* hexdump(stdout, "iv", ivec, AES_BLOCK_SIZE); */ + for(n=0 ; n < AES_BLOCK_SIZE ; ++n) + out[n] ^= iv[n]; + /* hexdump(stdout, "out", out, AES_BLOCK_SIZE); */ + memcpy(tmp3, tmp2, AES_BLOCK_SIZE); + iv = tmp3; + iv2 = out; + len -= AES_BLOCK_SIZE; + in += AES_BLOCK_SIZE; + out += AES_BLOCK_SIZE; + } + + } + } |