mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-27 06:24:20 +01:00
15b0a39322
In `mbedtls_ccm_self_test()`, enforce input and output buffers sent to the ccm API to be contigous and aligned, by copying the test vectors to buffers on the stack.
480 lines
14 KiB
C
480 lines
14 KiB
C
/*
|
|
* NIST SP800-38C compliant CCM implementation
|
|
*
|
|
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
|
|
* 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.
|
|
*
|
|
* This file is part of mbed TLS (https://tls.mbed.org)
|
|
*/
|
|
|
|
/*
|
|
* Definition of CCM:
|
|
* http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf
|
|
* RFC 3610 "Counter with CBC-MAC (CCM)"
|
|
*
|
|
* Related:
|
|
* RFC 5116 "An Interface and Algorithms for Authenticated Encryption"
|
|
*/
|
|
|
|
#if !defined(MBEDTLS_CONFIG_FILE)
|
|
#include "mbedtls/config.h"
|
|
#else
|
|
#include MBEDTLS_CONFIG_FILE
|
|
#endif
|
|
|
|
#if defined(MBEDTLS_CCM_C)
|
|
|
|
#include "mbedtls/ccm.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_CCM_ALT)
|
|
|
|
/* Implementation that should never be optimized out by the compiler */
|
|
static void mbedtls_zeroize( void *v, size_t n ) {
|
|
volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
|
|
}
|
|
|
|
#define CCM_ENCRYPT 0
|
|
#define CCM_DECRYPT 1
|
|
|
|
/*
|
|
* Initialize context
|
|
*/
|
|
void mbedtls_ccm_init( mbedtls_ccm_context *ctx )
|
|
{
|
|
memset( ctx, 0, sizeof( mbedtls_ccm_context ) );
|
|
}
|
|
|
|
int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx,
|
|
mbedtls_cipher_id_t cipher,
|
|
const unsigned char *key,
|
|
unsigned int keybits )
|
|
{
|
|
int ret;
|
|
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_CCM_BAD_INPUT );
|
|
|
|
if( cipher_info->block_size != 16 )
|
|
return( MBEDTLS_ERR_CCM_BAD_INPUT );
|
|
|
|
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,
|
|
MBEDTLS_ENCRYPT ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Free context
|
|
*/
|
|
void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
|
|
{
|
|
mbedtls_cipher_free( &ctx->cipher_ctx );
|
|
mbedtls_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
|
|
}
|
|
|
|
/*
|
|
* Macros for common operations.
|
|
* Results in smaller compiled code than static inline functions.
|
|
*/
|
|
|
|
/*
|
|
* Update the CBC-MAC state in y using a block in b
|
|
* (Always using b as the source helps the compiler optimise a bit better.)
|
|
*/
|
|
#define UPDATE_CBC_MAC \
|
|
for( i = 0; i < 16; i++ ) \
|
|
y[i] ^= b[i]; \
|
|
\
|
|
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, y, 16, y, &olen ) ) != 0 ) \
|
|
return( ret );
|
|
|
|
/*
|
|
* Encrypt or decrypt a partial block with CTR
|
|
* Warning: using b for temporary storage! src and dst must not be b!
|
|
* This avoids allocating one more 16 bytes buffer while allowing src == dst.
|
|
*/
|
|
#define CTR_CRYPT( dst, src, len ) \
|
|
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, 16, b, &olen ) ) != 0 ) \
|
|
return( ret ); \
|
|
\
|
|
for( i = 0; i < len; i++ ) \
|
|
dst[i] = src[i] ^ b[i];
|
|
|
|
/*
|
|
* Authenticated encryption or decryption
|
|
*/
|
|
static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
|
|
const unsigned char *iv, size_t iv_len,
|
|
const unsigned char *add, size_t add_len,
|
|
const unsigned char *input, unsigned char *output,
|
|
unsigned char *tag, size_t tag_len )
|
|
{
|
|
int ret;
|
|
unsigned char i;
|
|
unsigned char q;
|
|
size_t len_left, olen;
|
|
unsigned char b[16];
|
|
unsigned char y[16];
|
|
unsigned char ctr[16];
|
|
const unsigned char *src;
|
|
unsigned char *dst;
|
|
|
|
/*
|
|
* Check length requirements: SP800-38C A.1
|
|
* Additional requirement: a < 2^16 - 2^8 to simplify the code.
|
|
* 'length' checked later (when writing it to the first block)
|
|
*/
|
|
if( tag_len < 4 || tag_len > 16 || tag_len % 2 != 0 )
|
|
return( MBEDTLS_ERR_CCM_BAD_INPUT );
|
|
|
|
/* Also implies q is within bounds */
|
|
if( iv_len < 7 || iv_len > 13 )
|
|
return( MBEDTLS_ERR_CCM_BAD_INPUT );
|
|
|
|
if( add_len > 0xFF00 )
|
|
return( MBEDTLS_ERR_CCM_BAD_INPUT );
|
|
|
|
q = 16 - 1 - (unsigned char) iv_len;
|
|
|
|
/*
|
|
* First block B_0:
|
|
* 0 .. 0 flags
|
|
* 1 .. iv_len nonce (aka iv)
|
|
* iv_len+1 .. 15 length
|
|
*
|
|
* With flags as (bits):
|
|
* 7 0
|
|
* 6 add present?
|
|
* 5 .. 3 (t - 2) / 2
|
|
* 2 .. 0 q - 1
|
|
*/
|
|
b[0] = 0;
|
|
b[0] |= ( add_len > 0 ) << 6;
|
|
b[0] |= ( ( tag_len - 2 ) / 2 ) << 3;
|
|
b[0] |= q - 1;
|
|
|
|
memcpy( b + 1, iv, iv_len );
|
|
|
|
for( i = 0, len_left = length; i < q; i++, len_left >>= 8 )
|
|
b[15-i] = (unsigned char)( len_left & 0xFF );
|
|
|
|
if( len_left > 0 )
|
|
return( MBEDTLS_ERR_CCM_BAD_INPUT );
|
|
|
|
|
|
/* Start CBC-MAC with first block */
|
|
memset( y, 0, 16 );
|
|
UPDATE_CBC_MAC;
|
|
|
|
/*
|
|
* If there is additional data, update CBC-MAC with
|
|
* add_len, add, 0 (padding to a block boundary)
|
|
*/
|
|
if( add_len > 0 )
|
|
{
|
|
size_t use_len;
|
|
len_left = add_len;
|
|
src = add;
|
|
|
|
memset( b, 0, 16 );
|
|
b[0] = (unsigned char)( ( add_len >> 8 ) & 0xFF );
|
|
b[1] = (unsigned char)( ( add_len ) & 0xFF );
|
|
|
|
use_len = len_left < 16 - 2 ? len_left : 16 - 2;
|
|
memcpy( b + 2, src, use_len );
|
|
len_left -= use_len;
|
|
src += use_len;
|
|
|
|
UPDATE_CBC_MAC;
|
|
|
|
while( len_left > 0 )
|
|
{
|
|
use_len = len_left > 16 ? 16 : len_left;
|
|
|
|
memset( b, 0, 16 );
|
|
memcpy( b, src, use_len );
|
|
UPDATE_CBC_MAC;
|
|
|
|
len_left -= use_len;
|
|
src += use_len;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Prepare counter block for encryption:
|
|
* 0 .. 0 flags
|
|
* 1 .. iv_len nonce (aka iv)
|
|
* iv_len+1 .. 15 counter (initially 1)
|
|
*
|
|
* With flags as (bits):
|
|
* 7 .. 3 0
|
|
* 2 .. 0 q - 1
|
|
*/
|
|
ctr[0] = q - 1;
|
|
memcpy( ctr + 1, iv, iv_len );
|
|
memset( ctr + 1 + iv_len, 0, q );
|
|
ctr[15] = 1;
|
|
|
|
/*
|
|
* Authenticate and {en,de}crypt the message.
|
|
*
|
|
* The only difference between encryption and decryption is
|
|
* the respective order of authentication and {en,de}cryption.
|
|
*/
|
|
len_left = length;
|
|
src = input;
|
|
dst = output;
|
|
|
|
while( len_left > 0 )
|
|
{
|
|
size_t use_len = len_left > 16 ? 16 : len_left;
|
|
|
|
if( mode == CCM_ENCRYPT )
|
|
{
|
|
memset( b, 0, 16 );
|
|
memcpy( b, src, use_len );
|
|
UPDATE_CBC_MAC;
|
|
}
|
|
|
|
CTR_CRYPT( dst, src, use_len );
|
|
|
|
if( mode == CCM_DECRYPT )
|
|
{
|
|
memset( b, 0, 16 );
|
|
memcpy( b, dst, use_len );
|
|
UPDATE_CBC_MAC;
|
|
}
|
|
|
|
dst += use_len;
|
|
src += use_len;
|
|
len_left -= use_len;
|
|
|
|
/*
|
|
* Increment counter.
|
|
* No need to check for overflow thanks to the length check above.
|
|
*/
|
|
for( i = 0; i < q; i++ )
|
|
if( ++ctr[15-i] != 0 )
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Authentication: reset counter and crypt/mask internal tag
|
|
*/
|
|
for( i = 0; i < q; i++ )
|
|
ctr[15-i] = 0;
|
|
|
|
CTR_CRYPT( y, y, 16 );
|
|
memcpy( tag, y, tag_len );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/*
|
|
* Authenticated encryption
|
|
*/
|
|
int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
|
|
const unsigned char *iv, size_t iv_len,
|
|
const unsigned char *add, size_t add_len,
|
|
const unsigned char *input, unsigned char *output,
|
|
unsigned char *tag, size_t tag_len )
|
|
{
|
|
return( ccm_auth_crypt( ctx, CCM_ENCRYPT, length, iv, iv_len,
|
|
add, add_len, input, output, tag, tag_len ) );
|
|
}
|
|
|
|
/*
|
|
* Authenticated decryption
|
|
*/
|
|
int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
|
|
const unsigned char *iv, size_t iv_len,
|
|
const unsigned char *add, size_t add_len,
|
|
const unsigned char *input, unsigned char *output,
|
|
const unsigned char *tag, size_t tag_len )
|
|
{
|
|
int ret;
|
|
unsigned char check_tag[16];
|
|
unsigned char i;
|
|
int diff;
|
|
|
|
if( ( ret = ccm_auth_crypt( ctx, CCM_DECRYPT, length,
|
|
iv, iv_len, add, add_len,
|
|
input, output, check_tag, tag_len ) ) != 0 )
|
|
{
|
|
return( ret );
|
|
}
|
|
|
|
/* Check tag in "constant-time" */
|
|
for( diff = 0, i = 0; i < tag_len; i++ )
|
|
diff |= tag[i] ^ check_tag[i];
|
|
|
|
if( diff != 0 )
|
|
{
|
|
mbedtls_zeroize( output, length );
|
|
return( MBEDTLS_ERR_CCM_AUTH_FAILED );
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#endif /* !MBEDTLS_CCM_ALT */
|
|
|
|
#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
|
|
/*
|
|
* Examples 1 to 3 from SP800-38C Appendix C
|
|
*/
|
|
|
|
#define NB_TESTS 3
|
|
#define CCM_SELFTEST_PT_MAX_LEN 24
|
|
#define CCM_SELFTEST_CT_MAX_LEN 32
|
|
/*
|
|
* The data is the same for all tests, only the used length changes
|
|
*/
|
|
static const unsigned char key[] = {
|
|
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
|
|
0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
|
|
};
|
|
|
|
static const unsigned char iv[] = {
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
|
|
0x18, 0x19, 0x1a, 0x1b
|
|
};
|
|
|
|
static const unsigned char ad[] = {
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
|
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
|
|
0x10, 0x11, 0x12, 0x13
|
|
};
|
|
|
|
static const unsigned char msg[CCM_SELFTEST_PT_MAX_LEN] = {
|
|
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
|
|
0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
|
|
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
|
|
};
|
|
|
|
static const size_t iv_len [NB_TESTS] = { 7, 8, 12 };
|
|
static const size_t add_len[NB_TESTS] = { 8, 16, 20 };
|
|
static const size_t msg_len[NB_TESTS] = { 4, 16, 24 };
|
|
static const size_t tag_len[NB_TESTS] = { 4, 6, 8 };
|
|
|
|
static const unsigned char res[NB_TESTS][CCM_SELFTEST_CT_MAX_LEN] = {
|
|
{ 0x71, 0x62, 0x01, 0x5b, 0x4d, 0xac, 0x25, 0x5d },
|
|
{ 0xd2, 0xa1, 0xf0, 0xe0, 0x51, 0xea, 0x5f, 0x62,
|
|
0x08, 0x1a, 0x77, 0x92, 0x07, 0x3d, 0x59, 0x3d,
|
|
0x1f, 0xc6, 0x4f, 0xbf, 0xac, 0xcd },
|
|
{ 0xe3, 0xb2, 0x01, 0xa9, 0xf5, 0xb7, 0x1a, 0x7a,
|
|
0x9b, 0x1c, 0xea, 0xec, 0xcd, 0x97, 0xe7, 0x0b,
|
|
0x61, 0x76, 0xaa, 0xd9, 0xa4, 0x42, 0x8a, 0xa5,
|
|
0x48, 0x43, 0x92, 0xfb, 0xc1, 0xb0, 0x99, 0x51 }
|
|
};
|
|
|
|
int mbedtls_ccm_self_test( int verbose )
|
|
{
|
|
mbedtls_ccm_context ctx;
|
|
/*
|
|
* Some hardware accelerators require the input and output buffers
|
|
* would be in RAM, because the flash is not accessible.
|
|
* Use buffers on the stack to hold the test vectors data.
|
|
*/
|
|
unsigned char plaintext[CCM_SELFTEST_PT_MAX_LEN];
|
|
unsigned char ciphertext[CCM_SELFTEST_CT_MAX_LEN];
|
|
size_t i;
|
|
int ret;
|
|
|
|
mbedtls_ccm_init( &ctx );
|
|
|
|
if( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, key, 8 * sizeof key ) != 0 )
|
|
{
|
|
if( verbose != 0 )
|
|
mbedtls_printf( " CCM: setup failed" );
|
|
|
|
return( 1 );
|
|
}
|
|
|
|
for( i = 0; i < NB_TESTS; i++ )
|
|
{
|
|
if( verbose != 0 )
|
|
mbedtls_printf( " CCM-AES #%u: ", (unsigned int) i + 1 );
|
|
|
|
memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN );
|
|
memset( ciphertext, 0, CCM_SELFTEST_CT_MAX_LEN );
|
|
memcpy( plaintext, msg, msg_len[i] );
|
|
|
|
ret = mbedtls_ccm_encrypt_and_tag( &ctx, msg_len[i],
|
|
iv, iv_len[i], ad, add_len[i],
|
|
plaintext, ciphertext,
|
|
ciphertext + msg_len[i], tag_len[i] );
|
|
|
|
if( ret != 0 ||
|
|
memcmp( ciphertext, res[i], msg_len[i] + tag_len[i] ) != 0 )
|
|
{
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "failed\n" );
|
|
|
|
return( 1 );
|
|
}
|
|
memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN );
|
|
|
|
ret = mbedtls_ccm_auth_decrypt( &ctx, msg_len[i],
|
|
iv, iv_len[i], ad, add_len[i],
|
|
ciphertext, plaintext,
|
|
ciphertext + msg_len[i], tag_len[i] );
|
|
|
|
if( ret != 0 ||
|
|
memcmp( plaintext, msg, msg_len[i] ) != 0 )
|
|
{
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "failed\n" );
|
|
|
|
return( 1 );
|
|
}
|
|
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "passed\n" );
|
|
}
|
|
|
|
mbedtls_ccm_free( &ctx );
|
|
|
|
if( verbose != 0 )
|
|
mbedtls_printf( "\n" );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
|
|
|
|
#endif /* MBEDTLS_CCM_C */
|