/*
* Implementation of NIST SP 800-38F key wrapping, supporting KW and KWP modes
* only
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Definition of Key Wrapping:
* https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-38F.pdf
* RFC 3394 "Advanced Encryption Standard (AES) Key Wrap Algorithm"
* RFC 5649 "Advanced Encryption Standard (AES) Key Wrap with Padding Algorithm"
*
* Note: RFC 3394 defines different methodology for intermediate operations for
* the wrapping and unwrapping operation than the definition in NIST SP 800-38F.
*/
#include "common.h"
#if defined(MBEDTLS_NIST_KW_C)
#include "mbedtls/nist_kw.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include <stdint.h>
#include <string.h>
#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#define mbedtls_printf printf
#endif /* MBEDTLS_PLATFORM_C */
#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
#if !defined(MBEDTLS_NIST_KW_ALT)
#define KW_SEMIBLOCK_LENGTH 8
#define MIN_SEMIBLOCKS_COUNT 3
/* constant-time buffer comparison */
static inline unsigned char mbedtls_nist_kw_safer_memcmp(const void *a, const void *b, size_t n) {
size_t i;
volatile const unsigned char *A = (volatile const unsigned char *) a;
volatile const unsigned char *B = (volatile const unsigned char *) b;
volatile unsigned char diff = 0;
for (i = 0; i < n; i++) {
/* Read volatile data in order before computing diff.
* This avoids IAR compiler warning:
* 'the order of volatile accesses is undefined ..' */
unsigned char x = A[i], y = B[i];
diff |= x ^ y;
}
return (diff);
}
/*! The 64-bit default integrity check value (ICV) for KW mode. */
static const unsigned char NIST_KW_ICV1[] = {0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6};
/*! The 32-bit default integrity check value (ICV) for KWP mode. */
static const unsigned char NIST_KW_ICV2[] = {0xA6, 0x59, 0x59, 0xA6};
#ifndef GET_UINT32_BE
#define GET_UINT32_BE(n,b,i) \
do { \
(n) = ( (uint32_t) (b)[(i) ] << 24 ) \
| ( (uint32_t) (b)[(i) + 1] << 16 ) \
| ( (uint32_t) (b)[(i) + 2] << 8 ) \
| ( (uint32_t) (b)[(i) + 3] ); \
} while( 0 )
#endif
#ifndef PUT_UINT32_BE
#define PUT_UINT32_BE(n,b,i) \
do { \
(b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
(b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
(b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
(b)[(i) + 3] = (unsigned char) ( (n) ); \
} while( 0 )
#endif
/*
* Initialize context
*/
void mbedtls_nist_kw_init(mbedtls_nist_kw_context *ctx) {
memset(ctx, 0, sizeof(mbedtls_nist_kw_context));
}
int mbedtls_nist_kw_setkey(mbedtls_nist_kw_context *ctx,
mbedtls_cipher_id_t cipher,
const unsigned char *key,
unsigned int keybits,
const int is_wrap) {
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const mbedtls_cipher_info_t *cipher_info;
cipher_info = mbedtls_cipher_info_from_values(cipher,
keybits,
MBEDTLS_MODE_ECB);
if (cipher_info == NULL)
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
if (cipher_info->block_size != 16)
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
/*
* SP 800-38F currently defines AES cipher as the only block cipher allowed:
* "For KW and KWP, the underlying block cipher shall be approved, and the
* block size shall be 128 bits. Currently, the AES block cipher, with key
* lengths of 128, 192, or 256 bits, is the only block cipher that fits
* this profile."
* Currently we don't support other 128 bit block ciphers for key wrapping,
* such as Camellia and Aria.
*/
if (cipher != MBEDTLS_CIPHER_ID_AES)
return (MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE);
mbedtls_cipher_free(&ctx->cipher_ctx);
if ((ret = mbedtls_cipher_setup(&ctx->cipher_ctx, cipher_info)) != 0)
return (ret);
if ((ret = mbedtls_cipher_setkey(&ctx->cipher_ctx, key, keybits,
is_wrap ? MBEDTLS_ENCRYPT :
MBEDTLS_DECRYPT)
) != 0) {
return (ret);
}
return (0);
}
/*
* Free context
*/
void mbedtls_nist_kw_free(mbedtls_nist_kw_context *ctx) {
mbedtls_cipher_free(&ctx->cipher_ctx);
mbedtls_platform_zeroize(ctx, sizeof(mbedtls_nist_kw_context));
}
/*
* Helper function for Xoring the uint64_t "t" with the encrypted A.
* Defined in NIST SP 800-38F section 6.1
*/
static void calc_a_xor_t(unsigned char A[KW_SEMIBLOCK_LENGTH], uint64_t t) {
size_t i = 0;
for (i = 0; i < sizeof(t); i++) {
A[i] ^= (t >> ((sizeof(t) - 1 - i) * 8)) & 0xff;
}
}
/*
* KW-AE as defined in SP 800-38F section 6.2
* KWP-AE as defined in SP 800-38F section 6.3
*/
int mbedtls_nist_kw_wrap(mbedtls_nist_kw_context *ctx,
mbedtls_nist_kw_mode_t mode,
const unsigned char *input, size_t in_len,
unsigned char *output, size_t *out_len, size_t out_size) {
int ret = 0;
size_t semiblocks = 0;
size_t s;
size_t olen, padlen = 0;
uint64_t t = 0;
unsigned char outbuff[KW_SEMIBLOCK_LENGTH * 2];
unsigned char inbuff[KW_SEMIBLOCK_LENGTH * 2];
unsigned char *R2 = output + KW_SEMIBLOCK_LENGTH;
unsigned char *A = output;
*out_len = 0;
/*
* Generate the String to work on
*/
if (mode == MBEDTLS_KW_MODE_KW) {
if (out_size < in_len + KW_SEMIBLOCK_LENGTH) {
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
}
/*
* According to SP 800-38F Table 1, the plaintext length for KW
* must be between 2 to 2^54-1 semiblocks inclusive.
*/
if (in_len < 16 ||
#if SIZE_MAX > 0x1FFFFFFFFFFFFF8
in_len > 0x1FFFFFFFFFFFFF8 ||
#endif
in_len % KW_SEMIBLOCK_LENGTH != 0) {
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
}
memcpy(output, NIST_KW_ICV1, KW_SEMIBLOCK_LENGTH);
memmove(output + KW_SEMIBLOCK_LENGTH, input, in_len);
} else {
if (in_len % 8 != 0) {
padlen = (8 - (in_len % 8));
}
if (out_size < in_len + KW_SEMIBLOCK_LENGTH + padlen) {
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
}
/*
* According to SP 800-38F Table 1, the plaintext length for KWP
* must be between 1 and 2^32-1 octets inclusive.
*/
if (in_len < 1
#if SIZE_MAX > 0xFFFFFFFF
|| in_len > 0xFFFFFFFF
#endif
) {
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
}
memcpy(output, NIST_KW_ICV2, KW_SEMIBLOCK_LENGTH / 2);
PUT_UINT32_BE((in_len & 0xffffffff), output,
KW_SEMIBLOCK_LENGTH / 2);
memcpy(output + KW_SEMIBLOCK_LENGTH, input, in_len);
memset(output + KW_SEMIBLOCK_LENGTH + in_len, 0, padlen);
}
semiblocks = ((in_len + padlen) / KW_SEMIBLOCK_LENGTH) + 1;
s = 6 * (semiblocks - 1);
if (mode == MBEDTLS_KW_MODE_KWP
&& in_len <= KW_SEMIBLOCK_LENGTH) {
memcpy(inbuff, output, 16);
ret = mbedtls_cipher_update(&ctx->cipher_ctx,
inbuff, 16, output, &olen);
if (ret != 0)
goto cleanup;
} else {
/*
* Do the wrapping function W, as defined in RFC 3394 section 2.2.1
*/
if (semiblocks < MIN_SEMIBLOCKS_COUNT) {
ret = MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA;
goto cleanup;
}
/* Calculate intermediate values */
for (t = 1; t <= s; t++) {
memcpy(inbuff, A, KW_SEMIBLOCK_LENGTH);
memcpy(inbuff + KW_SEMIBLOCK_LENGTH, R2, KW_SEMIBLOCK_LENGTH);
ret = mbedtls_cipher_update(&ctx->cipher_ctx,
inbuff, 16, outbuff, &olen);
if (ret != 0)
goto cleanup;
memcpy(A, outbuff, KW_SEMIBLOCK_LENGTH);
calc_a_xor_t(A, t);
memcpy(R2, outbuff + KW_SEMIBLOCK_LENGTH, KW_SEMIBLOCK_LENGTH);
R2 += KW_SEMIBLOCK_LENGTH;
if (R2 >= output + (semiblocks * KW_SEMIBLOCK_LENGTH))
R2 = output + KW_SEMIBLOCK_LENGTH;
}
}
*out_len = semiblocks * KW_SEMIBLOCK_LENGTH;
cleanup:
if (ret != 0) {
memset(output, 0, semiblocks * KW_SEMIBLOCK_LENGTH);
}
mbedtls_platform_zeroize(inbuff, KW_SEMIBLOCK_LENGTH * 2);
mbedtls_platform_zeroize(outbuff, KW_SEMIBLOCK_LENGTH * 2);
return (ret);
}
/*
* W-1 function as defined in RFC 3394 section 2.2.2
* This function assumes the following:
* 1. Output buffer is at least of size ( semiblocks - 1 ) * KW_SEMIBLOCK_LENGTH.
* 2. The input buffer is of size semiblocks * KW_SEMIBLOCK_LENGTH.
* 3. Minimal number of semiblocks is 3.
* 4. A is a buffer to hold the first semiblock of the input buffer.
*/
static int unwrap(mbedtls_nist_kw_context *ctx,
const unsigned char *input, size_t semiblocks,
unsigned char A[KW_SEMIBLOCK_LENGTH],
unsigned char *output, size_t *out_len) {
int ret = 0;
const size_t s = 6 * (semiblocks - 1);
size_t olen;
uint64_t t = 0;
unsigned char outbuff[KW_SEMIBLOCK_LENGTH * 2];
unsigned char inbuff[KW_SEMIBLOCK_LENGTH * 2];
unsigned char *R = output + (semiblocks - 2) * KW_SEMIBLOCK_LENGTH;
*out_len = 0;
if (semiblocks < MIN_SEMIBLOCKS_COUNT) {
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
}
memcpy(A, input, KW_SEMIBLOCK_LENGTH);
memmove(output, input + KW_SEMIBLOCK_LENGTH, (semiblocks - 1) * KW_SEMIBLOCK_LENGTH);
/* Calculate intermediate values */
for (t = s; t >= 1; t--) {
calc_a_xor_t(A, t);
memcpy(inbuff, A, KW_SEMIBLOCK_LENGTH);
memcpy(inbuff + KW_SEMIBLOCK_LENGTH, R, KW_SEMIBLOCK_LENGTH);
ret = mbedtls_cipher_update(&ctx->cipher_ctx,
inbuff, 16, outbuff, &olen);
if (ret != 0)
goto cleanup;
memcpy(A, outbuff, KW_SEMIBLOCK_LENGTH);
/* Set R as LSB64 of outbuff */
memcpy(R, outbuff + KW_SEMIBLOCK_LENGTH, KW_SEMIBLOCK_LENGTH);
if (R == output)
R = output + (semiblocks - 2) * KW_SEMIBLOCK_LENGTH;
else
R -= KW_SEMIBLOCK_LENGTH;
}
*out_len = (semiblocks - 1) * KW_SEMIBLOCK_LENGTH;
cleanup:
if (ret != 0)
memset(output, 0, (semiblocks - 1) * KW_SEMIBLOCK_LENGTH);
mbedtls_platform_zeroize(inbuff, sizeof(inbuff));
mbedtls_platform_zeroize(outbuff, sizeof(outbuff));
return (ret);
}
/*
* KW-AD as defined in SP 800-38F section 6.2
* KWP-AD as defined in SP 800-38F section 6.3
*/
int mbedtls_nist_kw_unwrap(mbedtls_nist_kw_context *ctx,
mbedtls_nist_kw_mode_t mode,
const unsigned char *input, size_t in_len,
unsigned char *output, size_t *out_len, size_t out_size) {
int ret = 0;
size_t i, olen;
unsigned char A[KW_SEMIBLOCK_LENGTH];
unsigned char diff, bad_padding = 0;
*out_len = 0;
if (out_size < in_len - KW_SEMIBLOCK_LENGTH) {
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
}
if (mode == MBEDTLS_KW_MODE_KW) {
/*
* According to SP 800-38F Table 1, the ciphertext length for KW
* must be between 3 to 2^54 semiblocks inclusive.
*/
if (in_len < 24 ||
#if SIZE_MAX > 0x200000000000000
in_len > 0x200000000000000 ||
#endif
in_len % KW_SEMIBLOCK_LENGTH != 0) {
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
}
ret = unwrap(ctx, input, in_len / KW_SEMIBLOCK_LENGTH,
A, output, out_len);
if (ret != 0)
goto cleanup;
/* Check ICV in "constant-time" */
diff = mbedtls_nist_kw_safer_memcmp(NIST_KW_ICV1, A, KW_SEMIBLOCK_LENGTH);
if (diff != 0) {
ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
goto cleanup;
}
} else if (mode == MBEDTLS_KW_MODE_KWP) {
size_t padlen = 0;
uint32_t Plen;
/*
* According to SP 800-38F Table 1, the ciphertext length for KWP
* must be between 2 to 2^29 semiblocks inclusive.
*/
if (in_len < KW_SEMIBLOCK_LENGTH * 2 ||
#if SIZE_MAX > 0x100000000
in_len > 0x100000000 ||
#endif
in_len % KW_SEMIBLOCK_LENGTH != 0) {
return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
}
if (in_len == KW_SEMIBLOCK_LENGTH * 2) {
unsigned char outbuff[KW_SEMIBLOCK_LENGTH * 2];
ret = mbedtls_cipher_update(&ctx->cipher_ctx,
input, 16, outbuff, &olen);
if (ret != 0)
goto cleanup;
memcpy(A, outbuff, KW_SEMIBLOCK_LENGTH);
memcpy(output, outbuff + KW_SEMIBLOCK_LENGTH, KW_SEMIBLOCK_LENGTH);
mbedtls_platform_zeroize(outbuff, sizeof(outbuff));
*out_len = KW_SEMIBLOCK_LENGTH;
} else {
/* in_len >= KW_SEMIBLOCK_LENGTH * 3 */
ret = unwrap(ctx, input, in_len / KW_SEMIBLOCK_LENGTH,
A, output, out_len);
if (ret != 0)
goto cleanup;
}
/* Check ICV in "constant-time" */
diff = mbedtls_nist_kw_safer_memcmp(NIST_KW_ICV2, A, KW_SEMIBLOCK_LENGTH / 2);
if (diff != 0) {
ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
}
GET_UINT32_BE(Plen, A, KW_SEMIBLOCK_LENGTH / 2);
/*
* Plen is the length of the plaintext, when the input is valid.
* If Plen is larger than the plaintext and padding, padlen will be
* larger than 8, because of the type wrap around.
*/
padlen = in_len - KW_SEMIBLOCK_LENGTH - Plen;
if (padlen > 7) {
padlen &= 7;
ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
}
/* Check padding in "constant-time" */
for (diff = 0, i = 0; i < KW_SEMIBLOCK_LENGTH; i++) {
if (i >= KW_SEMIBLOCK_LENGTH - padlen)
diff |= output[*out_len - KW_SEMIBLOCK_LENGTH + i];
else
bad_padding |= output[*out_len - KW_SEMIBLOCK_LENGTH + i];
}
if (diff != 0) {
ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
}
if (ret != 0) {
goto cleanup;
}
memset(output + Plen, 0, padlen);
*out_len = Plen;
} else {
ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
goto cleanup;
}
cleanup:
if (ret != 0) {
memset(output, 0, *out_len);
*out_len = 0;
}
mbedtls_platform_zeroize(&bad_padding, sizeof(bad_padding));
mbedtls_platform_zeroize(&diff, sizeof(diff));
mbedtls_platform_zeroize(A, sizeof(A));
return (ret);
}
#endif /* !MBEDTLS_NIST_KW_ALT */
#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
#define KW_TESTS 3
/*
* Test vectors taken from NIST
* https://csrc.nist.gov/Projects/Cryptographic-Algorithm-Validation-Program/CAVP-TESTING-BLOCK-CIPHER-MODES#KW
*/
static const unsigned int key_len[KW_TESTS] = { 16, 24, 32 };
static const unsigned char kw_key[KW_TESTS][32] = {
{
0x75, 0x75, 0xda, 0x3a, 0x93, 0x60, 0x7c, 0xc2,
0xbf, 0xd8, 0xce, 0xc7, 0xaa, 0xdf, 0xd9, 0xa6
},
{
0x2d, 0x85, 0x26, 0x08, 0x1d, 0x02, 0xfb, 0x5b,
0x85, 0xf6, 0x9a, 0xc2, 0x86, 0xec, 0xd5, 0x7d,
0x40, 0xdf, 0x5d, 0xf3, 0x49, 0x47, 0x44, 0xd3
},
{
0x11, 0x2a, 0xd4, 0x1b, 0x48, 0x56, 0xc7, 0x25,
0x4a, 0x98, 0x48, 0xd3, 0x0f, 0xdd, 0x78, 0x33,
0x5b, 0x03, 0x9a, 0x48, 0xa8, 0x96, 0x2c, 0x4d,
0x1c, 0xb7, 0x8e, 0xab, 0xd5, 0xda, 0xd7, 0x88
}
};
static const unsigned char kw_msg[KW_TESTS][40] = {
{
0x42, 0x13, 0x6d, 0x3c, 0x38, 0x4a, 0x3e, 0xea,
0xc9, 0x5a, 0x06, 0x6f, 0xd2, 0x8f, 0xed, 0x3f
},
{
0x95, 0xc1, 0x1b, 0xf5, 0x35, 0x3a, 0xfe, 0xdb,
0x98, 0xfd, 0xd6, 0xc8, 0xca, 0x6f, 0xdb, 0x6d,
0xa5, 0x4b, 0x74, 0xb4, 0x99, 0x0f, 0xdc, 0x45,
0xc0, 0x9d, 0x15, 0x8f, 0x51, 0xce, 0x62, 0x9d,
0xe2, 0xaf, 0x26, 0xe3, 0x25, 0x0e, 0x6b, 0x4c
},
{
0x1b, 0x20, 0xbf, 0x19, 0x90, 0xb0, 0x65, 0xd7,
0x98, 0xe1, 0xb3, 0x22, 0x64, 0xad, 0x50, 0xa8,
0x74, 0x74, 0x92, 0xba, 0x09, 0xa0, 0x4d, 0xd1
}
};
static const size_t kw_msg_len[KW_TESTS] = { 16, 40, 24 };
static const size_t kw_out_len[KW_TESTS] = { 24, 48, 32 };
static const unsigned char kw_res[KW_TESTS][48] = {
{
0x03, 0x1f, 0x6b, 0xd7, 0xe6, 0x1e, 0x64, 0x3d,
0xf6, 0x85, 0x94, 0x81, 0x6f, 0x64, 0xca, 0xa3,
0xf5, 0x6f, 0xab, 0xea, 0x25, 0x48, 0xf5, 0xfb
},
{
0x44, 0x3c, 0x6f, 0x15, 0x09, 0x83, 0x71, 0x91,
0x3e, 0x5c, 0x81, 0x4c, 0xa1, 0xa0, 0x42, 0xec,
0x68, 0x2f, 0x7b, 0x13, 0x6d, 0x24, 0x3a, 0x4d,
0x6c, 0x42, 0x6f, 0xc6, 0x97, 0x15, 0x63, 0xe8,
0xa1, 0x4a, 0x55, 0x8e, 0x09, 0x64, 0x16, 0x19,
0xbf, 0x03, 0xfc, 0xaf, 0x90, 0xb1, 0xfc, 0x2d
},
{
0xba, 0x8a, 0x25, 0x9a, 0x47, 0x1b, 0x78, 0x7d,
0xd5, 0xd5, 0x40, 0xec, 0x25, 0xd4, 0x3d, 0x87,
0x20, 0x0f, 0xda, 0xdc, 0x6d, 0x1f, 0x05, 0xd9,
0x16, 0x58, 0x4f, 0xa9, 0xf6, 0xcb, 0xf5, 0x12
}
};
static const unsigned char kwp_key[KW_TESTS][32] = {
{
0x78, 0x65, 0xe2, 0x0f, 0x3c, 0x21, 0x65, 0x9a,
0xb4, 0x69, 0x0b, 0x62, 0x9c, 0xdf, 0x3c, 0xc4
},
{
0xf5, 0xf8, 0x96, 0xa3, 0xbd, 0x2f, 0x4a, 0x98,
0x23, 0xef, 0x16, 0x2b, 0x00, 0xb8, 0x05, 0xd7,
0xde, 0x1e, 0xa4, 0x66, 0x26, 0x96, 0xa2, 0x58
},
{
0x95, 0xda, 0x27, 0x00, 0xca, 0x6f, 0xd9, 0xa5,
0x25, 0x54, 0xee, 0x2a, 0x8d, 0xf1, 0x38, 0x6f,
0x5b, 0x94, 0xa1, 0xa6, 0x0e, 0xd8, 0xa4, 0xae,
0xf6, 0x0a, 0x8d, 0x61, 0xab, 0x5f, 0x22, 0x5a
}
};
static const unsigned char kwp_msg[KW_TESTS][31] = {
{
0xbd, 0x68, 0x43, 0xd4, 0x20, 0x37, 0x8d, 0xc8,
0x96
},
{
0x6c, 0xcd, 0xd5, 0x85, 0x18, 0x40, 0x97, 0xeb,
0xd5, 0xc3, 0xaf, 0x3e, 0x47, 0xd0, 0x2c, 0x19,
0x14, 0x7b, 0x4d, 0x99, 0x5f, 0x96, 0x43, 0x66,
0x91, 0x56, 0x75, 0x8c, 0x13, 0x16, 0x8f
},
{ 0xd1 }
};
static const size_t kwp_msg_len[KW_TESTS] = { 9, 31, 1 };
static const unsigned char kwp_res[KW_TESTS][48] = {
{
0x41, 0xec, 0xa9, 0x56, 0xd4, 0xaa, 0x04, 0x7e,
0xb5, 0xcf, 0x4e, 0xfe, 0x65, 0x96, 0x61, 0xe7,
0x4d, 0xb6, 0xf8, 0xc5, 0x64, 0xe2, 0x35, 0x00
},
{
0x4e, 0x9b, 0xc2, 0xbc, 0xbc, 0x6c, 0x1e, 0x13,
0xd3, 0x35, 0xbc, 0xc0, 0xf7, 0x73, 0x6a, 0x88,
0xfa, 0x87, 0x53, 0x66, 0x15, 0xbb, 0x8e, 0x63,
0x8b, 0xcc, 0x81, 0x66, 0x84, 0x68, 0x17, 0x90,
0x67, 0xcf, 0xa9, 0x8a, 0x9d, 0x0e, 0x33, 0x26
},
{
0x06, 0xba, 0x7a, 0xe6, 0xf3, 0x24, 0x8c, 0xfd,
0xcf, 0x26, 0x75, 0x07, 0xfa, 0x00, 0x1b, 0xc4
}
};
static const size_t kwp_out_len[KW_TESTS] = { 24, 40, 16 };
int mbedtls_nist_kw_self_test(int verbose) {
mbedtls_nist_kw_context ctx;
unsigned char out[48];
size_t olen;
int i;
int ret = 0;
mbedtls_nist_kw_init(&ctx);
for (i = 0; i < KW_TESTS; i++) {
if (verbose != 0)
mbedtls_printf(" KW-AES-%u ", (unsigned int) key_len[i] * 8);
ret = mbedtls_nist_kw_setkey(&ctx, MBEDTLS_CIPHER_ID_AES,
kw_key[i], key_len[i] * 8, 1);
if (ret != 0) {
if (verbose != 0)
mbedtls_printf(" KW: setup failed ");
goto end;
}
ret = mbedtls_nist_kw_wrap(&ctx, MBEDTLS_KW_MODE_KW, kw_msg[i],
kw_msg_len[i], out, &olen, sizeof(out));
if (ret != 0 || kw_out_len[i] != olen ||
memcmp(out, kw_res[i], kw_out_len[i]) != 0) {
if (verbose != 0)
mbedtls_printf("failed. ");
ret = 1;
goto end;
}
if ((ret = mbedtls_nist_kw_setkey(&ctx, MBEDTLS_CIPHER_ID_AES,
kw_key[i], key_len[i] * 8, 0))
!= 0) {
if (verbose != 0)
mbedtls_printf(" KW: setup failed ");
goto end;
}
ret = mbedtls_nist_kw_unwrap(&ctx, MBEDTLS_KW_MODE_KW,
out, olen, out, &olen, sizeof(out));
if (ret != 0 || olen != kw_msg_len[i] ||
memcmp(out, kw_msg[i], kw_msg_len[i]) != 0) {
if (verbose != 0)
mbedtls_printf("failed\n");
ret = 1;
goto end;
}
if (verbose != 0)
mbedtls_printf(" passed\n");
}
for (i = 0; i < KW_TESTS; i++) {
olen = sizeof(out);
if (verbose != 0)
mbedtls_printf(" KWP-AES-%u ", (unsigned int) key_len[i] * 8);
ret = mbedtls_nist_kw_setkey(&ctx, MBEDTLS_CIPHER_ID_AES, kwp_key[i],
key_len[i] * 8, 1);
if (ret != 0) {
if (verbose != 0)
mbedtls_printf(" KWP: setup failed ");
goto end;
}
ret = mbedtls_nist_kw_wrap(&ctx, MBEDTLS_KW_MODE_KWP, kwp_msg[i],
kwp_msg_len[i], out, &olen, sizeof(out));
if (ret != 0 || kwp_out_len[i] != olen ||
memcmp(out, kwp_res[i], kwp_out_len[i]) != 0) {
if (verbose != 0)
mbedtls_printf("failed. ");
ret = 1;
goto end;
}
if ((ret = mbedtls_nist_kw_setkey(&ctx, MBEDTLS_CIPHER_ID_AES,
kwp_key[i], key_len[i] * 8, 0))
!= 0) {
if (verbose != 0)
mbedtls_printf(" KWP: setup failed ");
goto end;
}
ret = mbedtls_nist_kw_unwrap(&ctx, MBEDTLS_KW_MODE_KWP, out,
olen, out, &olen, sizeof(out));
if (ret != 0 || olen != kwp_msg_len[i] ||
memcmp(out, kwp_msg[i], kwp_msg_len[i]) != 0) {
if (verbose != 0)
mbedtls_printf("failed. ");
ret = 1;
goto end;
}
if (verbose != 0)
mbedtls_printf(" passed\n");
}
end:
mbedtls_nist_kw_free(&ctx);
if (verbose != 0)
mbedtls_printf("\n");
return (ret);
}
#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
#endif /* MBEDTLS_NIST_KW_C */