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cipher-selftest.c
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/* cipher-selftest.c - Helper functions for bulk encryption selftests.
* Copyright © 2013 Jussi Kivilinna <jussi.kivilinna@iki.fi>
*
* This file is part of Libgcrypt.
*
* Libgcrypt is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser general Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* Libgcrypt is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#ifdef HAVE_SYSLOG
# include <syslog.h>
#endif /*HAVE_SYSLOG*/
#include "types.h"
#include "g10lib.h"
#include "cipher.h"
#include "bufhelp.h"
#include "cipher-selftest.h"
#ifdef HAVE_STDINT_H
# include <stdint.h> /* uintptr_t */
#elif defined(HAVE_INTTYPES_H)
# include <inttypes.h>
#else
/* In this case, uintptr_t is provided by config.h. */
#endif
/* Helper macro to force alignment to 16 bytes. */
#ifdef HAVE_GCC_ATTRIBUTE_ALIGNED
# define ATTR_ALIGNED_16 __attribute__ ((aligned (16)))
#else
# define ATTR_ALIGNED_16
#endif
/* Run the self-tests for <block cipher>-CBC-<block size>, tests bulk CBC
decryption. Returns NULL on success. */
const char *
_gcry_selftest_helper_cbc (const char *cipher, gcry_cipher_setkey_t setkey_func,
gcry_cipher_encrypt_t encrypt_one,
gcry_cipher_bulk_cbc_dec_t bulk_cbc_dec,
const int nblocks, const int blocksize,
const int context_size)
{
int i, offs;
unsigned char *ctx, *plaintext, *plaintext2, *ciphertext, *iv, *iv2, *mem;
unsigned int ctx_aligned_size, memsize;
static const unsigned char key[16] ATTR_ALIGNED_16 = {
0x66,0x9A,0x00,0x7F,0xC7,0x6A,0x45,0x9F,
0x98,0xBA,0xF9,0x17,0xFE,0xDF,0x95,0x22
};
/* Allocate buffers, align first two elements to 16 bytes and latter to
block size. */
ctx_aligned_size = context_size + 15;
ctx_aligned_size -= ctx_aligned_size & 0xf;
memsize = ctx_aligned_size + (blocksize * 2) + (blocksize * nblocks * 3) + 16;
mem = gcry_calloc (1, memsize);
if (!mem)
return "failed to allocate memory";
offs = (16 - ((uintptr_t)mem & 15)) & 15;
ctx = (void*)(mem + offs);
iv = ctx + ctx_aligned_size;
iv2 = iv + blocksize;
plaintext = iv2 + blocksize;
plaintext2 = plaintext + nblocks * blocksize;
ciphertext = plaintext2 + nblocks * blocksize;
/* Initialize ctx */
setkey_func (ctx, key, sizeof(key));
/* Test single block code path */
memset (iv, 0x4e, blocksize);
memset (iv2, 0x4e, blocksize);
for (i = 0; i < blocksize; i++)
plaintext[i] = i;
/* CBC manually. */
buf_xor (ciphertext, iv, plaintext, blocksize);
encrypt_one (ctx, ciphertext, ciphertext);
memcpy (iv, ciphertext, blocksize);
/* CBC decrypt. */
bulk_cbc_dec (ctx, iv2, plaintext2, ciphertext, 1);
if (memcmp (plaintext2, plaintext, blocksize))
{
gcry_free (mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CBC-%d test failed (plaintext mismatch)", cipher,
blocksize * 8);
#endif
return "selftest for CBC failed - see syslog for details";
}
if (memcmp (iv2, iv, blocksize))
{
gcry_free (mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CBC-%d test failed (IV mismatch)", cipher, blocksize * 8);
#endif
return "selftest for CBC failed - see syslog for details";
}
/* Test parallelized code paths */
memset (iv, 0x5f, blocksize);
memset (iv2, 0x5f, blocksize);
for (i = 0; i < nblocks * blocksize; i++)
plaintext[i] = i;
/* Create CBC ciphertext manually. */
for (i = 0; i < nblocks * blocksize; i+=blocksize)
{
buf_xor (&ciphertext[i], iv, &plaintext[i], blocksize);
encrypt_one (ctx, &ciphertext[i], &ciphertext[i]);
memcpy (iv, &ciphertext[i], blocksize);
}
/* Decrypt using bulk CBC and compare result. */
bulk_cbc_dec (ctx, iv2, plaintext2, ciphertext, nblocks);
if (memcmp (plaintext2, plaintext, nblocks * blocksize))
{
gcry_free (mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CBC-%d test failed (plaintext mismatch, parallel path)",
cipher, blocksize * 8);
#endif
return "selftest for CBC failed - see syslog for details";
}
if (memcmp (iv2, iv, blocksize))
{
gcry_free (mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CBC-%d test failed (IV mismatch, parallel path)",
cipher, blocksize * 8);
#endif
return "selftest for CBC failed - see syslog for details";
}
gcry_free (mem);
return NULL;
}
/* Run the self-tests for <block cipher>-CFB-<block size>, tests bulk CFB
decryption. Returns NULL on success. */
const char *
_gcry_selftest_helper_cfb (const char *cipher, gcry_cipher_setkey_t setkey_func,
gcry_cipher_encrypt_t encrypt_one,
gcry_cipher_bulk_cfb_dec_t bulk_cfb_dec,
const int nblocks, const int blocksize,
const int context_size)
{
int i, offs;
unsigned char *ctx, *plaintext, *plaintext2, *ciphertext, *iv, *iv2, *mem;
unsigned int ctx_aligned_size, memsize;
static const unsigned char key[16] ATTR_ALIGNED_16 = {
0x11,0x9A,0x00,0x7F,0xC7,0x6A,0x45,0x9F,
0x98,0xBA,0xF9,0x17,0xFE,0xDF,0x95,0x33
};
/* Allocate buffers, align first two elements to 16 bytes and latter to
block size. */
ctx_aligned_size = context_size + 15;
ctx_aligned_size -= ctx_aligned_size & 0xf;
memsize = ctx_aligned_size + (blocksize * 2) + (blocksize * nblocks * 3) + 16;
mem = gcry_calloc (1, memsize);
if (!mem)
return "failed to allocate memory";
offs = (16 - ((uintptr_t)mem & 15)) & 15;
ctx = (void*)(mem + offs);
iv = ctx + ctx_aligned_size;
iv2 = iv + blocksize;
plaintext = iv2 + blocksize;
plaintext2 = plaintext + nblocks * blocksize;
ciphertext = plaintext2 + nblocks * blocksize;
/* Initialize ctx */
setkey_func (ctx, key, sizeof(key));
/* Test single block code path */
memset(iv, 0xd3, blocksize);
memset(iv2, 0xd3, blocksize);
for (i = 0; i < blocksize; i++)
plaintext[i] = i;
/* CFB manually. */
encrypt_one (ctx, ciphertext, iv);
buf_xor_2dst (iv, ciphertext, plaintext, blocksize);
/* CFB decrypt. */
bulk_cfb_dec (ctx, iv2, plaintext2, ciphertext, 1);
if (memcmp(plaintext2, plaintext, blocksize))
{
gcry_free(mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CFB-%d test failed (plaintext mismatch)", cipher,
blocksize * 8);
#endif
return "selftest for CFB failed - see syslog for details";
}
if (memcmp(iv2, iv, blocksize))
{
gcry_free(mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CFB-%d test failed (IV mismatch)", cipher, blocksize * 8);
#endif
return "selftest for CFB failed - see syslog for details";
}
/* Test parallelized code paths */
memset(iv, 0xe6, blocksize);
memset(iv2, 0xe6, blocksize);
for (i = 0; i < nblocks * blocksize; i++)
plaintext[i] = i;
/* Create CFB ciphertext manually. */
for (i = 0; i < nblocks * blocksize; i+=blocksize)
{
encrypt_one (ctx, &ciphertext[i], iv);
buf_xor_2dst (iv, &ciphertext[i], &plaintext[i], blocksize);
}
/* Decrypt using bulk CBC and compare result. */
bulk_cfb_dec (ctx, iv2, plaintext2, ciphertext, nblocks);
if (memcmp(plaintext2, plaintext, nblocks * blocksize))
{
gcry_free(mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CFB-%d test failed (plaintext mismatch, parallel path)",
cipher, blocksize * 8);
#endif
return "selftest for CFB failed - see syslog for details";
}
if (memcmp(iv2, iv, blocksize))
{
gcry_free(mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CFB-%d test failed (IV mismatch, parallel path)", cipher,
blocksize * 8);
#endif
return "selftest for CFB failed - see syslog for details";
}
gcry_free(mem);
return NULL;
}
/* Run the self-tests for <block cipher>-CTR-<block size>, tests IV increment
of bulk CTR encryption. Returns NULL on success. */
const char *
_gcry_selftest_helper_ctr (const char *cipher, gcry_cipher_setkey_t setkey_func,
gcry_cipher_encrypt_t encrypt_one,
gcry_cipher_bulk_ctr_enc_t bulk_ctr_enc,
const int nblocks, const int blocksize,
const int context_size)
{
int i, j, offs, diff;
unsigned char *ctx, *plaintext, *plaintext2, *ciphertext, *iv, *iv2, *mem;
unsigned int ctx_aligned_size, memsize;
static const unsigned char key[16] ATTR_ALIGNED_16 = {
0x06,0x9A,0x00,0x7F,0xC7,0x6A,0x45,0x9F,
0x98,0xBA,0xF9,0x17,0xFE,0xDF,0x95,0x21
};
/* Allocate buffers, align first two elements to 16 bytes and latter to
block size. */
ctx_aligned_size = context_size + 15;
ctx_aligned_size -= ctx_aligned_size & 0xf;
memsize = ctx_aligned_size + (blocksize * 2) + (blocksize * nblocks * 3) + 16;
mem = gcry_calloc (1, memsize);
if (!mem)
return "failed to allocate memory";
offs = (16 - ((uintptr_t)mem & 15)) & 15;
ctx = (void*)(mem + offs);
iv = ctx + ctx_aligned_size;
iv2 = iv + blocksize;
plaintext = iv2 + blocksize;
plaintext2 = plaintext + nblocks * blocksize;
ciphertext = plaintext2 + nblocks * blocksize;
/* Initialize ctx */
setkey_func (ctx, key, sizeof(key));
/* Test single block code path */
memset (iv, 0xff, blocksize);
for (i = 0; i < blocksize; i++)
plaintext[i] = i;
/* CTR manually. */
encrypt_one (ctx, ciphertext, iv);
for (i = 0; i < blocksize; i++)
ciphertext[i] ^= plaintext[i];
for (i = blocksize; i > 0; i--)
{
iv[i-1]++;
if (iv[i-1])
break;
}
memset (iv2, 0xff, blocksize);
bulk_ctr_enc (ctx, iv2, plaintext2, ciphertext, 1);
if (memcmp (plaintext2, plaintext, blocksize))
{
gcry_free (mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CTR-%d test failed (plaintext mismatch)", cipher,
blocksize * 8);
#endif
return "selftest for CTR failed - see syslog for details";
}
if (memcmp (iv2, iv, blocksize))
{
gcry_free (mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CTR-%d test failed (IV mismatch)", cipher,
blocksize * 8);
#endif
return "selftest for CTR failed - see syslog for details";
}
/* Test parallelized code paths */
for (diff = 0; diff < nblocks; diff++) {
memset(iv, 0xff, blocksize);
iv[blocksize-1] -= diff;
for (i = 0; i < blocksize * nblocks; i++)
plaintext[i] = i;
/* Create CTR ciphertext manually. */
for (i = 0; i < blocksize * nblocks; i+=blocksize)
{
encrypt_one (ctx, &ciphertext[i], iv);
for (j = 0; j < blocksize; j++)
ciphertext[i+j] ^= plaintext[i+j];
for (j = blocksize; j > 0; j--)
{
iv[j-1]++;
if (iv[j-1])
break;
}
}
/* Decrypt using bulk CTR and compare result. */
memset(iv2, 0xff, blocksize);
iv2[blocksize-1] -= diff;
bulk_ctr_enc (ctx, iv2, plaintext2, ciphertext, nblocks);
if (memcmp (plaintext2, plaintext, blocksize * nblocks))
{
gcry_free (mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CTR-%d test failed (plaintext mismatch, diff: %d)", cipher,
blocksize * 8, diff);
#endif
return "selftest for CTR failed - see syslog for details";
}
if (memcmp(iv2, iv, blocksize))
{
gcry_free (mem);
#ifdef HAVE_SYSLOG
syslog (LOG_USER|LOG_WARNING, "Libgcrypt warning: "
"%s-CTR-%d test failed (IV mismatch, diff: %d)", cipher,
blocksize * 8, diff);
#endif
return "selftest for CTR failed - see syslog for details";
}
}
gcry_free (mem);
return NULL;
}

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