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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2023-01-10 23:15:27 +01:00
parent 3900bddd77
commit ff36bba5dc
442 changed files with 86735 additions and 89439 deletions
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580
library/ccm.c
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@@ -51,50 +51,53 @@
/*
* Initialize context
*/
void mbedtls_ccm_init( mbedtls_ccm_context *ctx )
void mbedtls_ccm_init(mbedtls_ccm_context *ctx)
{
memset( ctx, 0, sizeof( mbedtls_ccm_context ) );
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 mbedtls_ccm_setkey(mbedtls_ccm_context *ctx,
mbedtls_cipher_id_t cipher,
const unsigned char *key,
unsigned int keybits)
{
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_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 );
cipher_info = mbedtls_cipher_info_from_values(cipher, keybits,
MBEDTLS_MODE_ECB);
if (cipher_info == NULL) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
return( 0 );
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 )
void mbedtls_ccm_free(mbedtls_ccm_context *ctx)
{
if( ctx == NULL )
if (ctx == NULL) {
return;
mbedtls_cipher_free( &ctx->cipher_ctx );
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
}
mbedtls_cipher_free(&ctx->cipher_ctx);
mbedtls_platform_zeroize(ctx, sizeof(mbedtls_ccm_context));
}
#define CCM_STATE__CLEAR 0
@@ -107,33 +110,33 @@ void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
/*
* Encrypt or decrypt a partial block with CTR
*/
static int mbedtls_ccm_crypt( mbedtls_ccm_context *ctx,
size_t offset, size_t use_len,
const unsigned char *input,
unsigned char *output )
static int mbedtls_ccm_crypt(mbedtls_ccm_context *ctx,
size_t offset, size_t use_len,
const unsigned char *input,
unsigned char *output)
{
size_t olen = 0;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char tmp_buf[16] = {0};
unsigned char tmp_buf[16] = { 0 };
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctx->ctr, 16, tmp_buf,
&olen ) ) != 0 )
{
if ((ret = mbedtls_cipher_update(&ctx->cipher_ctx, ctx->ctr, 16, tmp_buf,
&olen)) != 0) {
ctx->state |= CCM_STATE__ERROR;
mbedtls_platform_zeroize(tmp_buf, sizeof(tmp_buf));
return ret;
}
mbedtls_xor( output, input, tmp_buf + offset, use_len );
mbedtls_xor(output, input, tmp_buf + offset, use_len);
mbedtls_platform_zeroize(tmp_buf, sizeof(tmp_buf));
return ret;
}
static void mbedtls_ccm_clear_state(mbedtls_ccm_context *ctx) {
static void mbedtls_ccm_clear_state(mbedtls_ccm_context *ctx)
{
ctx->state = CCM_STATE__CLEAR;
memset( ctx->y, 0, 16);
memset( ctx->ctr, 0, 16);
memset(ctx->y, 0, 16);
memset(ctx->ctr, 0, 16);
}
static int ccm_calculate_first_block_if_ready(mbedtls_ccm_context *ctx)
@@ -145,21 +148,18 @@ static int ccm_calculate_first_block_if_ready(mbedtls_ccm_context *ctx)
/* length calculation can be done only after both
* mbedtls_ccm_starts() and mbedtls_ccm_set_lengths() have been executed
*/
if( !(ctx->state & CCM_STATE__STARTED) || !(ctx->state & CCM_STATE__LENGTHS_SET) )
if (!(ctx->state & CCM_STATE__STARTED) || !(ctx->state & CCM_STATE__LENGTHS_SET)) {
return 0;
}
/* CCM expects non-empty tag.
* CCM* allows empty tag. For CCM* without tag, ignore plaintext length.
*/
if( ctx->tag_len == 0 )
{
if( ctx->mode == MBEDTLS_CCM_STAR_ENCRYPT || ctx->mode == MBEDTLS_CCM_STAR_DECRYPT )
{
if (ctx->tag_len == 0) {
if (ctx->mode == MBEDTLS_CCM_STAR_ENCRYPT || ctx->mode == MBEDTLS_CCM_STAR_DECRYPT) {
ctx->plaintext_len = 0;
}
else
{
return( MBEDTLS_ERR_CCM_BAD_INPUT );
} else {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
}
@@ -175,37 +175,37 @@ static int ccm_calculate_first_block_if_ready(mbedtls_ccm_context *ctx)
* 5 .. 3 (t - 2) / 2
* 2 .. 0 q - 1
*/
ctx->y[0] |= ( ctx->add_len > 0 ) << 6;
ctx->y[0] |= ( ( ctx->tag_len - 2 ) / 2 ) << 3;
ctx->y[0] |= (ctx->add_len > 0) << 6;
ctx->y[0] |= ((ctx->tag_len - 2) / 2) << 3;
ctx->y[0] |= ctx->q - 1;
for( i = 0, len_left = ctx->plaintext_len; i < ctx->q; i++, len_left >>= 8 )
ctx->y[15-i] = MBEDTLS_BYTE_0( len_left );
for (i = 0, len_left = ctx->plaintext_len; i < ctx->q; i++, len_left >>= 8) {
ctx->y[15-i] = MBEDTLS_BYTE_0(len_left);
}
if( len_left > 0 )
{
if (len_left > 0) {
ctx->state |= CCM_STATE__ERROR;
return( MBEDTLS_ERR_CCM_BAD_INPUT );
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
/* Start CBC-MAC with first block*/
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctx->y, 16, ctx->y, &olen ) ) != 0 )
{
if ((ret = mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ctx->y, &olen)) != 0) {
ctx->state |= CCM_STATE__ERROR;
return( ret );
return ret;
}
return (0);
return 0;
}
int mbedtls_ccm_starts( mbedtls_ccm_context *ctx,
int mode,
const unsigned char *iv,
size_t iv_len )
int mbedtls_ccm_starts(mbedtls_ccm_context *ctx,
int mode,
const unsigned char *iv,
size_t iv_len)
{
/* Also implies q is within bounds */
if( iv_len < 7 || iv_len > 13 )
return( MBEDTLS_ERR_CCM_BAD_INPUT );
if (iv_len < 7 || iv_len > 13) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
ctx->mode = mode;
ctx->q = 16 - 1 - (unsigned char) iv_len;
@@ -220,25 +220,25 @@ int mbedtls_ccm_starts( mbedtls_ccm_context *ctx,
* 7 .. 3 0
* 2 .. 0 q - 1
*/
memset( ctx->ctr, 0, 16);
memset(ctx->ctr, 0, 16);
ctx->ctr[0] = ctx->q - 1;
memcpy( ctx->ctr + 1, iv, iv_len );
memset( ctx->ctr + 1 + iv_len, 0, ctx->q );
memcpy(ctx->ctr + 1, iv, iv_len);
memset(ctx->ctr + 1 + iv_len, 0, ctx->q);
ctx->ctr[15] = 1;
/*
* See ccm_calculate_first_block_if_ready() for block layout description
*/
memcpy( ctx->y + 1, iv, iv_len );
memcpy(ctx->y + 1, iv, iv_len);
ctx->state |= CCM_STATE__STARTED;
return ccm_calculate_first_block_if_ready(ctx);
}
int mbedtls_ccm_set_lengths( mbedtls_ccm_context *ctx,
size_t total_ad_len,
size_t plaintext_len,
size_t tag_len )
int mbedtls_ccm_set_lengths(mbedtls_ccm_context *ctx,
size_t total_ad_len,
size_t plaintext_len,
size_t tag_len)
{
/*
* Check length requirements: SP800-38C A.1
@@ -247,11 +247,13 @@ int mbedtls_ccm_set_lengths( mbedtls_ccm_context *ctx,
*
* Also, loosen the requirements to enable support for CCM* (IEEE 802.15.4).
*/
if( tag_len == 2 || tag_len > 16 || tag_len % 2 != 0 )
return( MBEDTLS_ERR_CCM_BAD_INPUT );
if (tag_len == 2 || tag_len > 16 || tag_len % 2 != 0) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
if( total_ad_len >= 0xFF00 )
return( MBEDTLS_ERR_CCM_BAD_INPUT );
if (total_ad_len >= 0xFF00) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
ctx->plaintext_len = plaintext_len;
ctx->add_len = total_ad_len;
@@ -262,81 +264,72 @@ int mbedtls_ccm_set_lengths( mbedtls_ccm_context *ctx,
return ccm_calculate_first_block_if_ready(ctx);
}
int mbedtls_ccm_update_ad( mbedtls_ccm_context *ctx,
const unsigned char *add,
size_t add_len )
int mbedtls_ccm_update_ad(mbedtls_ccm_context *ctx,
const unsigned char *add,
size_t add_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t olen, use_len, offset;
if( ctx->state & CCM_STATE__ERROR )
{
if (ctx->state & CCM_STATE__ERROR) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
if( add_len > 0 )
{
if( ctx->state & CCM_STATE__AUTH_DATA_FINISHED )
{
if (add_len > 0) {
if (ctx->state & CCM_STATE__AUTH_DATA_FINISHED) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
if( !(ctx->state & CCM_STATE__AUTH_DATA_STARTED) )
{
if ( add_len > ctx->add_len )
{
if (!(ctx->state & CCM_STATE__AUTH_DATA_STARTED)) {
if (add_len > ctx->add_len) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
ctx->y[0] ^= (unsigned char)( ( ctx->add_len >> 8 ) & 0xFF );
ctx->y[1] ^= (unsigned char)( ( ctx->add_len ) & 0xFF );
ctx->y[0] ^= (unsigned char) ((ctx->add_len >> 8) & 0xFF);
ctx->y[1] ^= (unsigned char) ((ctx->add_len) & 0xFF);
ctx->state |= CCM_STATE__AUTH_DATA_STARTED;
}
else if ( ctx->processed + add_len > ctx->add_len )
{
} else if (ctx->processed + add_len > ctx->add_len) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
while( add_len > 0 )
{
while (add_len > 0) {
offset = (ctx->processed + 2) % 16; /* account for y[0] and y[1]
* holding total auth data length */
use_len = 16 - offset;
if( use_len > add_len )
if (use_len > add_len) {
use_len = add_len;
}
mbedtls_xor( ctx->y + offset, ctx->y + offset, add, use_len );
mbedtls_xor(ctx->y + offset, ctx->y + offset, add, use_len);
ctx->processed += use_len;
add_len -= use_len;
add += use_len;
if( use_len + offset == 16 || ctx->processed == ctx->add_len )
{
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctx->y, 16, ctx->y, &olen ) ) != 0 )
{
if (use_len + offset == 16 || ctx->processed == ctx->add_len) {
if ((ret =
mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ctx->y, &olen)) != 0) {
ctx->state |= CCM_STATE__ERROR;
return( ret );
return ret;
}
}
}
if( ctx->processed == ctx->add_len )
{
if (ctx->processed == ctx->add_len) {
ctx->state |= CCM_STATE__AUTH_DATA_FINISHED;
ctx->processed = 0; // prepare for mbedtls_ccm_update()
}
}
return (0);
return 0;
}
int mbedtls_ccm_update( mbedtls_ccm_context *ctx,
const unsigned char *input, size_t input_len,
unsigned char *output, size_t output_size,
size_t *output_len )
int mbedtls_ccm_update(mbedtls_ccm_context *ctx,
const unsigned char *input, size_t input_len,
unsigned char *output, size_t output_size,
size_t *output_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char i;
@@ -344,88 +337,86 @@ int mbedtls_ccm_update( mbedtls_ccm_context *ctx,
unsigned char local_output[16];
if( ctx->state & CCM_STATE__ERROR )
{
if (ctx->state & CCM_STATE__ERROR) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
/* Check against plaintext length only if performing operation with
* authentication
*/
if( ctx->tag_len != 0 && ctx->processed + input_len > ctx->plaintext_len )
{
if (ctx->tag_len != 0 && ctx->processed + input_len > ctx->plaintext_len) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
if( output_size < input_len )
return( MBEDTLS_ERR_CCM_BAD_INPUT );
if (output_size < input_len) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
*output_len = input_len;
ret = 0;
while ( input_len > 0 )
{
while (input_len > 0) {
offset = ctx->processed % 16;
use_len = 16 - offset;
if( use_len > input_len )
if (use_len > input_len) {
use_len = input_len;
}
ctx->processed += use_len;
if( ctx->mode == MBEDTLS_CCM_ENCRYPT || \
ctx->mode == MBEDTLS_CCM_STAR_ENCRYPT )
{
mbedtls_xor( ctx->y + offset, ctx->y + offset, input, use_len );
if (ctx->mode == MBEDTLS_CCM_ENCRYPT || \
ctx->mode == MBEDTLS_CCM_STAR_ENCRYPT) {
mbedtls_xor(ctx->y + offset, ctx->y + offset, input, use_len);
if( use_len + offset == 16 || ctx->processed == ctx->plaintext_len )
{
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctx->y, 16, ctx->y, &olen ) ) != 0 )
{
if (use_len + offset == 16 || ctx->processed == ctx->plaintext_len) {
if ((ret =
mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ctx->y, &olen)) != 0) {
ctx->state |= CCM_STATE__ERROR;
goto exit;
}
}
ret = mbedtls_ccm_crypt( ctx, offset, use_len, input, output );
if( ret != 0 )
ret = mbedtls_ccm_crypt(ctx, offset, use_len, input, output);
if (ret != 0) {
goto exit;
}
}
if( ctx->mode == MBEDTLS_CCM_DECRYPT || \
ctx->mode == MBEDTLS_CCM_STAR_DECRYPT )
{
if (ctx->mode == MBEDTLS_CCM_DECRYPT || \
ctx->mode == MBEDTLS_CCM_STAR_DECRYPT) {
/* Since output may be in shared memory, we cannot be sure that
* it will contain what we wrote to it. Therefore, we should avoid using
* it as input to any operations.
* Write decrypted data to local_output to avoid using output variable as
* input in the XOR operation for Y.
*/
ret = mbedtls_ccm_crypt( ctx, offset, use_len, input, local_output );
if( ret != 0 )
ret = mbedtls_ccm_crypt(ctx, offset, use_len, input, local_output);
if (ret != 0) {
goto exit;
}
mbedtls_xor( ctx->y + offset, ctx->y + offset, local_output, use_len );
mbedtls_xor(ctx->y + offset, ctx->y + offset, local_output, use_len);
memcpy( output, local_output, use_len );
mbedtls_platform_zeroize( local_output, 16 );
memcpy(output, local_output, use_len);
mbedtls_platform_zeroize(local_output, 16);
if( use_len + offset == 16 || ctx->processed == ctx->plaintext_len )
{
if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctx->y, 16, ctx->y, &olen ) ) != 0 )
{
if (use_len + offset == 16 || ctx->processed == ctx->plaintext_len) {
if ((ret =
mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ctx->y, &olen)) != 0) {
ctx->state |= CCM_STATE__ERROR;
goto exit;
}
}
}
if( use_len + offset == 16 || ctx->processed == ctx->plaintext_len )
{
for( i = 0; i < ctx->q; i++ )
if( ++(ctx->ctr)[15-i] != 0 )
break;
if (use_len + offset == 16 || ctx->processed == ctx->plaintext_len) {
for (i = 0; i < ctx->q; i++) {
if (++(ctx->ctr)[15-i] != 0) {
break;
}
}
}
input_len -= use_len;
@@ -434,167 +425,172 @@ int mbedtls_ccm_update( mbedtls_ccm_context *ctx,
}
exit:
mbedtls_platform_zeroize( local_output, 16 );
mbedtls_platform_zeroize(local_output, 16);
return ret;
}
int mbedtls_ccm_finish( mbedtls_ccm_context *ctx,
unsigned char *tag, size_t tag_len )
int mbedtls_ccm_finish(mbedtls_ccm_context *ctx,
unsigned char *tag, size_t tag_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char i;
if( ctx->state & CCM_STATE__ERROR )
{
if (ctx->state & CCM_STATE__ERROR) {
return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
}
if( ctx->add_len > 0 && !( ctx->state & CCM_STATE__AUTH_DATA_FINISHED ) )
{
if (ctx->add_len > 0 && !(ctx->state & CCM_STATE__AUTH_DATA_FINISHED)) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
if( ctx->plaintext_len > 0 && ctx->processed != ctx->plaintext_len )
{
if (ctx->plaintext_len > 0 && ctx->processed != ctx->plaintext_len) {
return MBEDTLS_ERR_CCM_BAD_INPUT;
}
/*
* Authentication: reset counter and crypt/mask internal tag
*/
for( i = 0; i < ctx->q; i++ )
for (i = 0; i < ctx->q; i++) {
ctx->ctr[15-i] = 0;
}
ret = mbedtls_ccm_crypt( ctx, 0, 16, ctx->y, ctx->y );
if( ret != 0 )
ret = mbedtls_ccm_crypt(ctx, 0, 16, ctx->y, ctx->y);
if (ret != 0) {
return ret;
if( tag != NULL )
memcpy( tag, ctx->y, tag_len );
}
if (tag != NULL) {
memcpy(tag, ctx->y, tag_len);
}
mbedtls_ccm_clear_state(ctx);
return( 0 );
return 0;
}
/*
* 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 )
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 = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t olen;
if( ( ret = mbedtls_ccm_starts( ctx, mode, iv, iv_len ) ) != 0 )
return( ret );
if ((ret = mbedtls_ccm_starts(ctx, mode, iv, iv_len)) != 0) {
return ret;
}
if( ( ret = mbedtls_ccm_set_lengths( ctx, add_len, length, tag_len ) ) != 0 )
return( ret );
if ((ret = mbedtls_ccm_set_lengths(ctx, add_len, length, tag_len)) != 0) {
return ret;
}
if( ( ret = mbedtls_ccm_update_ad( ctx, add, add_len ) ) != 0 )
return( ret );
if ((ret = mbedtls_ccm_update_ad(ctx, add, add_len)) != 0) {
return ret;
}
if( ( ret = mbedtls_ccm_update( ctx, input, length,
output, length, &olen ) ) != 0 )
return( ret );
if ((ret = mbedtls_ccm_update(ctx, input, length,
output, length, &olen)) != 0) {
return ret;
}
if( ( ret = mbedtls_ccm_finish( ctx, tag, tag_len ) ) != 0 )
return( ret );
if ((ret = mbedtls_ccm_finish(ctx, tag, tag_len)) != 0) {
return ret;
}
return( 0 );
return 0;
}
/*
* Authenticated encryption
*/
int mbedtls_ccm_star_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 )
int mbedtls_ccm_star_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, MBEDTLS_CCM_STAR_ENCRYPT, length, iv, iv_len,
add, add_len, input, output, tag, tag_len ) );
return ccm_auth_crypt(ctx, MBEDTLS_CCM_STAR_ENCRYPT, length, iv, iv_len,
add, add_len, input, output, tag, tag_len);
}
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 )
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, MBEDTLS_CCM_ENCRYPT, length, iv, iv_len,
add, add_len, input, output, tag, tag_len ) );
return ccm_auth_crypt(ctx, MBEDTLS_CCM_ENCRYPT, length, iv, iv_len,
add, add_len, input, output, tag, tag_len);
}
/*
* Authenticated decryption
*/
static int mbedtls_ccm_compare_tags(const unsigned char *tag1, const unsigned char *tag2, size_t tag_len)
static int mbedtls_ccm_compare_tags(const unsigned char *tag1,
const unsigned char *tag2,
size_t tag_len)
{
unsigned char i;
int diff;
/* Check tag in "constant-time" */
for( diff = 0, i = 0; i < tag_len; i++ )
for (diff = 0, i = 0; i < tag_len; i++) {
diff |= tag1[i] ^ tag2[i];
if( diff != 0 )
{
return( MBEDTLS_ERR_CCM_AUTH_FAILED );
}
return( 0 );
if (diff != 0) {
return MBEDTLS_ERR_CCM_AUTH_FAILED;
}
return 0;
}
static int ccm_auth_decrypt( 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,
const unsigned char *tag, size_t tag_len )
static int ccm_auth_decrypt(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,
const unsigned char *tag, size_t tag_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char check_tag[16];
if( ( ret = ccm_auth_crypt( ctx, mode, length,
iv, iv_len, add, add_len,
input, output, check_tag, tag_len ) ) != 0 )
{
return( ret );
if ((ret = ccm_auth_crypt(ctx, mode, length,
iv, iv_len, add, add_len,
input, output, check_tag, tag_len)) != 0) {
return ret;
}
if( ( ret = mbedtls_ccm_compare_tags( tag, check_tag, tag_len ) ) != 0 )
{
mbedtls_platform_zeroize( output, length );
return( ret );
if ((ret = mbedtls_ccm_compare_tags(tag, check_tag, tag_len)) != 0) {
mbedtls_platform_zeroize(output, length);
return ret;
}
return( 0 );
return 0;
}
int mbedtls_ccm_star_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 mbedtls_ccm_star_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)
{
return ccm_auth_decrypt( ctx, MBEDTLS_CCM_STAR_DECRYPT, length,
iv, iv_len, add, add_len,
input, output, tag, tag_len );
return ccm_auth_decrypt(ctx, MBEDTLS_CCM_STAR_DECRYPT, length,
iv, iv_len, add, add_len,
input, output, tag, tag_len);
}
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 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)
{
return ccm_auth_decrypt( ctx, MBEDTLS_CCM_DECRYPT, length,
iv, iv_len, add, add_len,
input, output, tag, tag_len );
return ccm_auth_decrypt(ctx, MBEDTLS_CCM_DECRYPT, length,
iv, iv_len, add, add_len,
input, output, tag, tag_len);
}
#endif /* !MBEDTLS_CCM_ALT */
@@ -631,7 +627,7 @@ static const unsigned char msg_test_data[CCM_SELFTEST_PT_MAX_LEN] = {
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
};
static const size_t iv_len_test_data [NB_TESTS] = { 7, 8, 12 };
static const size_t iv_len_test_data[NB_TESTS] = { 7, 8, 12 };
static const size_t add_len_test_data[NB_TESTS] = { 8, 16, 20 };
static const size_t msg_len_test_data[NB_TESTS] = { 4, 16, 24 };
static const size_t tag_len_test_data[NB_TESTS] = { 4, 6, 8 };
@@ -647,7 +643,7 @@ static const unsigned char res_test_data[NB_TESTS][CCM_SELFTEST_CT_MAX_LEN] = {
0x48, 0x43, 0x92, 0xfb, 0xc1, 0xb0, 0x99, 0x51 }
};
int mbedtls_ccm_self_test( int verbose )
int mbedtls_ccm_self_test(int verbose)
{
mbedtls_ccm_context ctx;
/*
@@ -660,70 +656,72 @@ int mbedtls_ccm_self_test( int verbose )
size_t i;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_ccm_init( &ctx );
mbedtls_ccm_init(&ctx);
if( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, key_test_data,
8 * sizeof key_test_data ) != 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_test_data, msg_len_test_data[i] );
ret = mbedtls_ccm_encrypt_and_tag( &ctx, msg_len_test_data[i],
iv_test_data, iv_len_test_data[i],
ad_test_data, add_len_test_data[i],
plaintext, ciphertext,
ciphertext + msg_len_test_data[i],
tag_len_test_data[i] );
if( ret != 0 ||
memcmp( ciphertext, res_test_data[i],
msg_len_test_data[i] + tag_len_test_data[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_test_data[i],
iv_test_data, iv_len_test_data[i],
ad_test_data, add_len_test_data[i],
ciphertext, plaintext,
ciphertext + msg_len_test_data[i],
tag_len_test_data[i] );
if( ret != 0 ||
memcmp( plaintext, msg_test_data, msg_len_test_data[i] ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
return( 1 );
if (mbedtls_ccm_setkey(&ctx, MBEDTLS_CIPHER_ID_AES, key_test_data,
8 * sizeof key_test_data) != 0) {
if (verbose != 0) {
mbedtls_printf(" CCM: setup failed");
}
if( verbose != 0 )
mbedtls_printf( "passed\n" );
return 1;
}
mbedtls_ccm_free( &ctx );
for (i = 0; i < NB_TESTS; i++) {
if (verbose != 0) {
mbedtls_printf(" CCM-AES #%u: ", (unsigned int) i + 1);
}
if( verbose != 0 )
mbedtls_printf( "\n" );
memset(plaintext, 0, CCM_SELFTEST_PT_MAX_LEN);
memset(ciphertext, 0, CCM_SELFTEST_CT_MAX_LEN);
memcpy(plaintext, msg_test_data, msg_len_test_data[i]);
return( 0 );
ret = mbedtls_ccm_encrypt_and_tag(&ctx, msg_len_test_data[i],
iv_test_data, iv_len_test_data[i],
ad_test_data, add_len_test_data[i],
plaintext, ciphertext,
ciphertext + msg_len_test_data[i],
tag_len_test_data[i]);
if (ret != 0 ||
memcmp(ciphertext, res_test_data[i],
msg_len_test_data[i] + tag_len_test_data[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_test_data[i],
iv_test_data, iv_len_test_data[i],
ad_test_data, add_len_test_data[i],
ciphertext, plaintext,
ciphertext + msg_len_test_data[i],
tag_len_test_data[i]);
if (ret != 0 ||
memcmp(plaintext, msg_test_data, msg_len_test_data[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 */