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/* nettle, low-level cryptographics library
*
* Copyright (C) 2013 Red Hat
* Copyright (C) 2008 Free Software Foundation, Inc.
*
* The nettle library 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/>.
*/
/* This is a known-answer test for the DRBG-CTR-AES.
*/
#include <config.h>
#include "errors.h"
#include <drbg-aes.h>
#include <string.h>
#include <stdio.h>
struct self_test_st {
const uint8_t entropy[DRBG_AES_SEED_SIZE];
const char *pstring;
const uint8_t res[4][16];
};
struct priv_st {
struct drbg_aes_ctx *ctx;
};
/* Run a Know-Answer-Test using a dedicated test context. */
int drbg_aes_self_test(void)
{
static const struct self_test_st tv[] = {
{
.entropy = {0xb9, 0xca, 0x7f, 0xd6, 0xa0, 0xf5, 0xd3, 0x42,
0x19, 0x6d, 0x84, 0x91, 0x76, 0x1c, 0x3b, 0xbe,
0x48, 0xb2, 0x82, 0x98, 0x68, 0xc2, 0x80, 0x00,
0x19, 0x6d, 0x84, 0x91, 0x76, 0x1c, 0x3b, 0xbe,
0x48, 0xb2, 0x82, 0x98, 0x68, 0xc2, 0x80, 0x00,
0x00, 0x00, 0x28, 0x18, 0x00, 0x00, 0x25, 0x00},
.pstring = "test test test",
.res = {
{0xa4, 0xae, 0xb4, 0x51, 0xd0, 0x0d, 0x97, 0xcc, 0x46,
0xbb, 0xc0, 0xec, 0x5c, 0xa1, 0xf0, 0x34},
{0x68, 0xc4, 0x04, 0x63, 0x3d, 0x9e, 0x2c, 0x05, 0x18,
0xcf, 0xde, 0x2a, 0x4c, 0x49, 0xc8, 0x2b},
{0x60, 0x5a, 0xd6, 0x71, 0x5e, 0xb3, 0x86, 0x22, 0xd5,
0x21, 0x7f, 0xd7, 0x1d, 0xa3, 0xff, 0xa6},
{0xe0, 0xf8, 0x77, 0x2c, 0xcb, 0xa4, 0x52, 0xa5, 0x35,
0xf5, 0x21, 0xb9, 0x20, 0x4e, 0xff, 0x3e},
}
},
{
.entropy = {
0xb9, 0xca, 0x7f, 0xd6, 0xa0, 0xf5, 0xd3, 0x42,
0x19, 0x6d, 0x84, 0x91, 0x76, 0x1c, 0x3b, 0xbe,
0x48, 0xb2, 0x82, 0x98, 0x68, 0xc2, 0x80, 0x00,
0x19, 0x6d, 0x84, 0x91, 0x76, 0x1c, 0x3b, 0xbe,
0x48, 0xb2, 0x82, 0x98, 0x68, 0xc2, 0x80, 0x00,
0x00, 0x00, 0x28, 0x18, 0x00, 0x00, 0x25, 0x00},
.pstring = "tost tost test",
.res = {
{0x47, 0x2d, 0x1e, 0xa9, 0xe9, 0xed, 0x02, 0xba, 0x0b,
0x8f, 0xc7, 0x59, 0x84, 0xe0, 0x7d, 0x6e},
{0x4c, 0x63, 0xfd, 0xc9, 0x17, 0x1e, 0x09, 0xca, 0x62,
0x72, 0x45, 0x4f, 0xeb, 0x5b, 0xd0, 0x02},
{0x3e, 0x29, 0x1c, 0xde, 0xd9, 0xdd, 0x65, 0x4f, 0xfe,
0xcd, 0x17, 0xa3, 0xa0, 0x23, 0x3b, 0xd5},
{0x2b, 0x45, 0xd2, 0x4a, 0xf9, 0xd4, 0x91, 0xa4, 0x2e,
0xaf, 0xe6, 0xb5, 0x40, 0xb4, 0xf5, 0xd7},
}
},
{
.entropy = {
0x42, 0x9c, 0x08, 0x3d, 0x82, 0xf4, 0x8a, 0x40,
0x66, 0xb5, 0x49, 0x27, 0xab, 0x42, 0xc7, 0xc3,
0x0e, 0xb7, 0x61, 0x3c, 0xfe, 0xb0, 0xbe, 0x73,
0xf7, 0x6e, 0x6d, 0x6f, 0x1d, 0xa3, 0x14, 0xfa,
0xbb, 0x4b, 0xc1, 0x0e, 0xc5, 0xfb, 0xcd, 0x46,
0xbe, 0x28, 0x61, 0xe7, 0x03, 0x2b, 0x37, 0x7d},
.pstring = "one two",
.res = {
{0x6c, 0x29, 0x75, 0xdc, 0xd3, 0xaf, 0xfa, 0xf0, 0xe9,
0xa8, 0xa4, 0xd8, 0x60, 0x62, 0xc9, 0xaa},
{0x2b, 0xac, 0x71, 0x36, 0x42, 0xbf, 0x2a, 0xff, 0xa7,
0xc7, 0xf6, 0x08, 0xa4, 0x3b, 0xe6, 0x00},
{0x1d, 0x2c, 0x18, 0xbc, 0xc4, 0xbe, 0x64, 0x4b, 0x9a,
0x6c, 0x45, 0xcb, 0x6b, 0xf2, 0xed, 0xc3},
{0xe3, 0x41, 0x58, 0x24, 0x57, 0xa0, 0x60, 0xad, 0xb6,
0x45, 0x8d, 0x8f, 0x32, 0x81, 0x77, 0xa9},
}
},
};
unsigned i, j;
struct drbg_aes_ctx test_ctx;
struct drbg_aes_ctx test_ctx2;
struct priv_st priv;
int ret, saved;
uint8_t *tmp;
unsigned char result[16];
memset(&priv, 0, sizeof(priv));
priv.ctx = &test_ctx;
/* Test the error handling of drbg_aes_init */
ret =
drbg_aes_init(&test_ctx, DRBG_AES_SEED_SIZE, tv[0].entropy,
DRBG_AES_SEED_SIZE*2, (void*)tv);
if (ret != 0) {
gnutls_assert();
return 0;
}
tmp = gnutls_malloc(MAX_DRBG_AES_GENERATE_SIZE+1);
if (tmp == NULL) {
gnutls_assert();
return 0;
}
for (i = 0; i < sizeof(tv) / sizeof(tv[0]); i++) {
/* Setup the key. */
ret =
drbg_aes_init(&test_ctx, DRBG_AES_SEED_SIZE, tv[i].entropy,
strlen(tv[i].pstring), (void *)tv[i].pstring);
if (ret == 0)
goto fail;
if (drbg_aes_is_seeded(&test_ctx) == 0)
goto fail;
/* Get and compare the first three results. */
for (j = 0; j < 3; j++) {
/* Compute the next value. */
if (drbg_aes_random(&test_ctx, 16, result) == 0)
goto fail;
/* Compare it to the known value. */
if (memcmp(result, tv[i].res[j], 16) != 0) {
goto fail;
}
}
ret =
drbg_aes_reseed(&test_ctx, DRBG_AES_SEED_SIZE,
tv[i].entropy, 0, NULL);
if (ret == 0)
goto fail;
if (drbg_aes_random(&test_ctx, 16, result) == 0)
goto fail;
if (memcmp(result, tv[i].res[3], 16) != 0) {
goto fail;
}
/* test the error handling of drbg_aes_random() */
saved = test_ctx.reseed_counter;
test_ctx.reseed_counter = DRBG_AES_RESEED_TIME+1;
if (drbg_aes_random(&test_ctx, 16, result) != 0) {
gnutls_assert();
goto fail;
}
test_ctx.reseed_counter = saved;
ret = drbg_aes_random(&test_ctx, MAX_DRBG_AES_GENERATE_SIZE+1, tmp);
if (ret == 0) {
gnutls_assert();
goto fail;
}
/* test the low-level function */
ret = drbg_aes_generate(&test_ctx, MAX_DRBG_AES_GENERATE_SIZE+1, tmp, 0, NULL);
if (ret != 0) {
gnutls_assert();
goto fail;
}
/* Test of the reseed function for error handling */
ret =
drbg_aes_reseed(&test_ctx, DRBG_AES_SEED_SIZE*2,
(uint8_t*)tv, 0, NULL);
if (ret != 0)
goto fail;
ret =
drbg_aes_reseed(&test_ctx, DRBG_AES_SEED_SIZE,
tv[i].entropy, DRBG_AES_SEED_SIZE*2, (uint8_t*)tv);
if (ret != 0)
goto fail;
/* check whether reseed detection works */
if (i==0) {
ret =
drbg_aes_reseed(&test_ctx, DRBG_AES_SEED_SIZE,
tv[i].entropy, 0, NULL);
if (ret == 0)
goto fail;
saved = test_ctx.reseed_counter;
test_ctx.reseed_counter = DRBG_AES_RESEED_TIME-4;
for (j=0;j<5;j++) {
if (drbg_aes_random(&test_ctx, 1, result) == 0) {
gnutls_assert();
goto fail;
}
}
/* that should fail */
if (drbg_aes_random(&test_ctx, 1, result) != 0) {
gnutls_assert();
goto fail;
}
test_ctx.reseed_counter = saved;
}
/* test deinit, which is zeroize_key() */
memcpy(&test_ctx2, &test_ctx, sizeof(test_ctx));
zeroize_key(&test_ctx, sizeof(test_ctx));
if (memcmp(&test_ctx, &test_ctx2, sizeof(test_ctx)) == 0) {
gnutls_assert();
goto fail;
}
}
free(tmp);
return 1;
fail:
free(tmp);
return 0;
}
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