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openssl/crypto/modes/cts128.c
Rich Salz 4f22f40507 Copyright consolidation 06/10 
Reviewed-by: Richard Levitte <levitte@openssl.org>
2016-05-17 14:51:04 -04:00

524 lines
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/*
* Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/crypto.h>
#include "modes_lcl.h"
#include <string.h>
/*
* Trouble with Ciphertext Stealing, CTS, mode is that there is no
* common official specification, but couple of cipher/application
* specific ones: RFC2040 and RFC3962. Then there is 'Proposal to
* Extend CBC Mode By "Ciphertext Stealing"' at NIST site, which
* deviates from mentioned RFCs. Most notably it allows input to be
* of block length and it doesn't flip the order of the last two
* blocks. CTS is being discussed even in ECB context, but it's not
* adopted for any known application. This implementation provides
* two interfaces: one compliant with above mentioned RFCs and one
* compliant with the NIST proposal, both extending CBC mode.
*/
size_t CRYPTO_cts128_encrypt_block(const unsigned char *in,
unsigned char *out, size_t len,
const void *key, unsigned char ivec[16],
block128_f block)
{
size_t residue, n;
if (len <= 16)
return 0;
if ((residue = len % 16) == 0)
residue = 16;
len -= residue;
CRYPTO_cbc128_encrypt(in, out, len, key, ivec, block);
in += len;
out += len;
for (n = 0; n < residue; ++n)
ivec[n] ^= in[n];
(*block) (ivec, ivec, key);
memcpy(out, out - 16, residue);
memcpy(out - 16, ivec, 16);
return len + residue;
}
size_t CRYPTO_nistcts128_encrypt_block(const unsigned char *in,
unsigned char *out, size_t len,
const void *key,
unsigned char ivec[16],
block128_f block)
{
size_t residue, n;
if (len < 16)
return 0;
residue = len % 16;
len -= residue;
CRYPTO_cbc128_encrypt(in, out, len, key, ivec, block);
if (residue == 0)
return len;
in += len;
out += len;
for (n = 0; n < residue; ++n)
ivec[n] ^= in[n];
(*block) (ivec, ivec, key);
memcpy(out - 16 + residue, ivec, 16);
return len + residue;
}
size_t CRYPTO_cts128_encrypt(const unsigned char *in, unsigned char *out,
size_t len, const void *key,
unsigned char ivec[16], cbc128_f cbc)
{
size_t residue;
union {
size_t align;
unsigned char c[16];
} tmp;
if (len <= 16)
return 0;
if ((residue = len % 16) == 0)
residue = 16;
len -= residue;
(*cbc) (in, out, len, key, ivec, 1);
in += len;
out += len;
#if defined(CBC_HANDLES_TRUNCATED_IO)
memcpy(tmp.c, out - 16, 16);
(*cbc) (in, out - 16, residue, key, ivec, 1);
memcpy(out, tmp.c, residue);
#else
memset(tmp.c, 0, sizeof(tmp));
memcpy(tmp.c, in, residue);
memcpy(out, out - 16, residue);
(*cbc) (tmp.c, out - 16, 16, key, ivec, 1);
#endif
return len + residue;
}
size_t CRYPTO_nistcts128_encrypt(const unsigned char *in, unsigned char *out,
size_t len, const void *key,
unsigned char ivec[16], cbc128_f cbc)
{
size_t residue;
union {
size_t align;
unsigned char c[16];
} tmp;
if (len < 16)
return 0;
residue = len % 16;
len -= residue;
(*cbc) (in, out, len, key, ivec, 1);
if (residue == 0)
return len;
in += len;
out += len;
#if defined(CBC_HANDLES_TRUNCATED_IO)
(*cbc) (in, out - 16 + residue, residue, key, ivec, 1);
#else
memset(tmp.c, 0, sizeof(tmp));
memcpy(tmp.c, in, residue);
(*cbc) (tmp.c, out - 16 + residue, 16, key, ivec, 1);
#endif
return len + residue;
}
size_t CRYPTO_cts128_decrypt_block(const unsigned char *in,
unsigned char *out, size_t len,
const void *key, unsigned char ivec[16],
block128_f block)
{
size_t residue, n;
union {
size_t align;
unsigned char c[32];
} tmp;
if (len <= 16)
return 0;
if ((residue = len % 16) == 0)
residue = 16;
len -= 16 + residue;
if (len) {
CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
in += len;
out += len;
}
(*block) (in, tmp.c + 16, key);
memcpy(tmp.c, tmp.c + 16, 16);
memcpy(tmp.c, in + 16, residue);
(*block) (tmp.c, tmp.c, key);
for (n = 0; n < 16; ++n) {
unsigned char c = in[n];
out[n] = tmp.c[n] ^ ivec[n];
ivec[n] = c;
}
for (residue += 16; n < residue; ++n)
out[n] = tmp.c[n] ^ in[n];
return 16 + len + residue;
}
size_t CRYPTO_nistcts128_decrypt_block(const unsigned char *in,
unsigned char *out, size_t len,
const void *key,
unsigned char ivec[16],
block128_f block)
{
size_t residue, n;
union {
size_t align;
unsigned char c[32];
} tmp;
if (len < 16)
return 0;
residue = len % 16;
if (residue == 0) {
CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
return len;
}
len -= 16 + residue;
if (len) {
CRYPTO_cbc128_decrypt(in, out, len, key, ivec, block);
in += len;
out += len;
}
(*block) (in + residue, tmp.c + 16, key);
memcpy(tmp.c, tmp.c + 16, 16);
memcpy(tmp.c, in, residue);
(*block) (tmp.c, tmp.c, key);
for (n = 0; n < 16; ++n) {
unsigned char c = in[n];
out[n] = tmp.c[n] ^ ivec[n];
ivec[n] = in[n + residue];
tmp.c[n] = c;
}
for (residue += 16; n < residue; ++n)
out[n] = tmp.c[n] ^ tmp.c[n - 16];
return 16 + len + residue;
}
size_t CRYPTO_cts128_decrypt(const unsigned char *in, unsigned char *out,
size_t len, const void *key,
unsigned char ivec[16], cbc128_f cbc)
{
size_t residue;
union {
size_t align;
unsigned char c[32];
} tmp;
if (len <= 16)
return 0;
if ((residue = len % 16) == 0)
residue = 16;
len -= 16 + residue;
if (len) {
(*cbc) (in, out, len, key, ivec, 0);
in += len;
out += len;
}
memset(tmp.c, 0, sizeof(tmp));
/*
* this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0]
*/
(*cbc) (in, tmp.c, 16, key, tmp.c + 16, 0);
memcpy(tmp.c, in + 16, residue);
#if defined(CBC_HANDLES_TRUNCATED_IO)
(*cbc) (tmp.c, out, 16 + residue, key, ivec, 0);
#else
(*cbc) (tmp.c, tmp.c, 32, key, ivec, 0);
memcpy(out, tmp.c, 16 + residue);
#endif
return 16 + len + residue;
}
size_t CRYPTO_nistcts128_decrypt(const unsigned char *in, unsigned char *out,
size_t len, const void *key,
unsigned char ivec[16], cbc128_f cbc)
{
size_t residue;
union {
size_t align;
unsigned char c[32];
} tmp;
if (len < 16)
return 0;
residue = len % 16;
if (residue == 0) {
(*cbc) (in, out, len, key, ivec, 0);
return len;
}
len -= 16 + residue;
if (len) {
(*cbc) (in, out, len, key, ivec, 0);
in += len;
out += len;
}
memset(tmp.c, 0, sizeof(tmp));
/*
* this places in[16] at &tmp.c[16] and decrypted block at &tmp.c[0]
*/
(*cbc) (in + residue, tmp.c, 16, key, tmp.c + 16, 0);
memcpy(tmp.c, in, residue);
#if defined(CBC_HANDLES_TRUNCATED_IO)
(*cbc) (tmp.c, out, 16 + residue, key, ivec, 0);
#else
(*cbc) (tmp.c, tmp.c, 32, key, ivec, 0);
memcpy(out, tmp.c, 16 + residue);
#endif
return 16 + len + residue;
}
#if defined(SELFTEST)
# include <stdio.h>
# include <openssl/aes.h>
/* test vectors from RFC 3962 */
static const unsigned char test_key[16] = "chicken teriyaki";
static const unsigned char test_input[64] =
"I would like the" " General Gau's C"
"hicken, please, " "and wonton soup.";
static const unsigned char test_iv[16] =
{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
static const unsigned char vector_17[17] = {
0xc6, 0x35, 0x35, 0x68, 0xf2, 0xbf, 0x8c, 0xb4,
0xd8, 0xa5, 0x80, 0x36, 0x2d, 0xa7, 0xff, 0x7f,
0x97
};
static const unsigned char vector_31[31] = {
0xfc, 0x00, 0x78, 0x3e, 0x0e, 0xfd, 0xb2, 0xc1,
0xd4, 0x45, 0xd4, 0xc8, 0xef, 0xf7, 0xed, 0x22,
0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5
};
static const unsigned char vector_32[32] = {
0x39, 0x31, 0x25, 0x23, 0xa7, 0x86, 0x62, 0xd5,
0xbe, 0x7f, 0xcb, 0xcc, 0x98, 0xeb, 0xf5, 0xa8,
0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5, 0x84
};
static const unsigned char vector_47[47] = {
0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5, 0x84,
0xb3, 0xff, 0xfd, 0x94, 0x0c, 0x16, 0xa1, 0x8c,
0x1b, 0x55, 0x49, 0xd2, 0xf8, 0x38, 0x02, 0x9e,
0x39, 0x31, 0x25, 0x23, 0xa7, 0x86, 0x62, 0xd5,
0xbe, 0x7f, 0xcb, 0xcc, 0x98, 0xeb, 0xf5
};
static const unsigned char vector_48[48] = {
0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5, 0x84,
0x9d, 0xad, 0x8b, 0xbb, 0x96, 0xc4, 0xcd, 0xc0,
0x3b, 0xc1, 0x03, 0xe1, 0xa1, 0x94, 0xbb, 0xd8,
0x39, 0x31, 0x25, 0x23, 0xa7, 0x86, 0x62, 0xd5,
0xbe, 0x7f, 0xcb, 0xcc, 0x98, 0xeb, 0xf5, 0xa8
};
static const unsigned char vector_64[64] = {
0x97, 0x68, 0x72, 0x68, 0xd6, 0xec, 0xcc, 0xc0,
0xc0, 0x7b, 0x25, 0xe2, 0x5e, 0xcf, 0xe5, 0x84,
0x39, 0x31, 0x25, 0x23, 0xa7, 0x86, 0x62, 0xd5,
0xbe, 0x7f, 0xcb, 0xcc, 0x98, 0xeb, 0xf5, 0xa8,
0x48, 0x07, 0xef, 0xe8, 0x36, 0xee, 0x89, 0xa5,
0x26, 0x73, 0x0d, 0xbc, 0x2f, 0x7b, 0xc8, 0x40,
0x9d, 0xad, 0x8b, 0xbb, 0x96, 0xc4, 0xcd, 0xc0,
0x3b, 0xc1, 0x03, 0xe1, 0xa1, 0x94, 0xbb, 0xd8
};
static AES_KEY encks, decks;
void test_vector(const unsigned char *vector, size_t len)
{
unsigned char iv[sizeof(test_iv)];
unsigned char cleartext[64], ciphertext[64];
size_t tail;
printf("vector_%d\n", len);
fflush(stdout);
if ((tail = len % 16) == 0)
tail = 16;
tail += 16;
/* test block-based encryption */
memcpy(iv, test_iv, sizeof(test_iv));
CRYPTO_cts128_encrypt_block(test_input, ciphertext, len, &encks, iv,
(block128_f) AES_encrypt);
if (memcmp(ciphertext, vector, len))
fprintf(stderr, "output_%d mismatch\n", len), exit(1);
if (memcmp(iv, vector + len - tail, sizeof(iv)))
fprintf(stderr, "iv_%d mismatch\n", len), exit(1);
/* test block-based decryption */
memcpy(iv, test_iv, sizeof(test_iv));
CRYPTO_cts128_decrypt_block(ciphertext, cleartext, len, &decks, iv,
(block128_f) AES_decrypt);
if (memcmp(cleartext, test_input, len))
fprintf(stderr, "input_%d mismatch\n", len), exit(2);
if (memcmp(iv, vector + len - tail, sizeof(iv)))
fprintf(stderr, "iv_%d mismatch\n", len), exit(2);
/* test streamed encryption */
memcpy(iv, test_iv, sizeof(test_iv));
CRYPTO_cts128_encrypt(test_input, ciphertext, len, &encks, iv,
(cbc128_f) AES_cbc_encrypt);
if (memcmp(ciphertext, vector, len))
fprintf(stderr, "output_%d mismatch\n", len), exit(3);
if (memcmp(iv, vector + len - tail, sizeof(iv)))
fprintf(stderr, "iv_%d mismatch\n", len), exit(3);
/* test streamed decryption */
memcpy(iv, test_iv, sizeof(test_iv));
CRYPTO_cts128_decrypt(ciphertext, cleartext, len, &decks, iv,
(cbc128_f) AES_cbc_encrypt);
if (memcmp(cleartext, test_input, len))
fprintf(stderr, "input_%d mismatch\n", len), exit(4);
if (memcmp(iv, vector + len - tail, sizeof(iv)))
fprintf(stderr, "iv_%d mismatch\n", len), exit(4);
}
void test_nistvector(const unsigned char *vector, size_t len)
{
unsigned char iv[sizeof(test_iv)];
unsigned char cleartext[64], ciphertext[64], nistvector[64];
size_t tail;
printf("nistvector_%d\n", len);
fflush(stdout);
if ((tail = len % 16) == 0)
tail = 16;
len -= 16 + tail;
memcpy(nistvector, vector, len);
/* flip two last blocks */
memcpy(nistvector + len, vector + len + 16, tail);
memcpy(nistvector + len + tail, vector + len, 16);
len += 16 + tail;
tail = 16;
/* test block-based encryption */
memcpy(iv, test_iv, sizeof(test_iv));
CRYPTO_nistcts128_encrypt_block(test_input, ciphertext, len, &encks, iv,
(block128_f) AES_encrypt);
if (memcmp(ciphertext, nistvector, len))
fprintf(stderr, "output_%d mismatch\n", len), exit(1);
if (memcmp(iv, nistvector + len - tail, sizeof(iv)))
fprintf(stderr, "iv_%d mismatch\n", len), exit(1);
/* test block-based decryption */
memcpy(iv, test_iv, sizeof(test_iv));
CRYPTO_nistcts128_decrypt_block(ciphertext, cleartext, len, &decks, iv,
(block128_f) AES_decrypt);
if (memcmp(cleartext, test_input, len))
fprintf(stderr, "input_%d mismatch\n", len), exit(2);
if (memcmp(iv, nistvector + len - tail, sizeof(iv)))
fprintf(stderr, "iv_%d mismatch\n", len), exit(2);
/* test streamed encryption */
memcpy(iv, test_iv, sizeof(test_iv));
CRYPTO_nistcts128_encrypt(test_input, ciphertext, len, &encks, iv,
(cbc128_f) AES_cbc_encrypt);
if (memcmp(ciphertext, nistvector, len))
fprintf(stderr, "output_%d mismatch\n", len), exit(3);
if (memcmp(iv, nistvector + len - tail, sizeof(iv)))
fprintf(stderr, "iv_%d mismatch\n", len), exit(3);
/* test streamed decryption */
memcpy(iv, test_iv, sizeof(test_iv));
CRYPTO_nistcts128_decrypt(ciphertext, cleartext, len, &decks, iv,
(cbc128_f) AES_cbc_encrypt);
if (memcmp(cleartext, test_input, len))
fprintf(stderr, "input_%d mismatch\n", len), exit(4);
if (memcmp(iv, nistvector + len - tail, sizeof(iv)))
fprintf(stderr, "iv_%d mismatch\n", len), exit(4);
}
int main()
{
AES_set_encrypt_key(test_key, 128, &encks);
AES_set_decrypt_key(test_key, 128, &decks);
test_vector(vector_17, sizeof(vector_17));
test_vector(vector_31, sizeof(vector_31));
test_vector(vector_32, sizeof(vector_32));
test_vector(vector_47, sizeof(vector_47));
test_vector(vector_48, sizeof(vector_48));
test_vector(vector_64, sizeof(vector_64));
test_nistvector(vector_17, sizeof(vector_17));
test_nistvector(vector_31, sizeof(vector_31));
test_nistvector(vector_32, sizeof(vector_32));
test_nistvector(vector_47, sizeof(vector_47));
test_nistvector(vector_48, sizeof(vector_48));
test_nistvector(vector_64, sizeof(vector_64));
return 0;
}
#endif
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