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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2023-01-11 14:52:35 +01:00
parent 480f683d15
commit 1b6c09a62e
391 changed files with 73134 additions and 75084 deletions
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502
library/entropy.c
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@ -48,103 +48,104 @@
#define ENTROPY_MAX_LOOP 256 /**< Maximum amount to loop before error */
void mbedtls_entropy_init( mbedtls_entropy_context *ctx )
void mbedtls_entropy_init(mbedtls_entropy_context *ctx)
{
ctx->source_count = 0;
memset( ctx->source, 0, sizeof( ctx->source ) );
memset(ctx->source, 0, sizeof(ctx->source));
#if defined(MBEDTLS_THREADING_C)
mbedtls_mutex_init( &ctx->mutex );
mbedtls_mutex_init(&ctx->mutex);
#endif
ctx->accumulator_started = 0;
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
mbedtls_sha512_init( &ctx->accumulator );
mbedtls_sha512_init(&ctx->accumulator);
#else
mbedtls_sha256_init( &ctx->accumulator );
mbedtls_sha256_init(&ctx->accumulator);
#endif
#if defined(MBEDTLS_HAVEGE_C)
mbedtls_havege_init( &ctx->havege_data );
mbedtls_havege_init(&ctx->havege_data);
#endif
/* Reminder: Update ENTROPY_HAVE_STRONG in the test files
* when adding more strong entropy sources here. */
#if defined(MBEDTLS_TEST_NULL_ENTROPY)
mbedtls_entropy_add_source( ctx, mbedtls_null_entropy_poll, NULL,
1, MBEDTLS_ENTROPY_SOURCE_STRONG );
mbedtls_entropy_add_source(ctx, mbedtls_null_entropy_poll, NULL,
1, MBEDTLS_ENTROPY_SOURCE_STRONG);
#endif
#if !defined(MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES)
#if !defined(MBEDTLS_NO_PLATFORM_ENTROPY)
mbedtls_entropy_add_source( ctx, mbedtls_platform_entropy_poll, NULL,
MBEDTLS_ENTROPY_MIN_PLATFORM,
MBEDTLS_ENTROPY_SOURCE_STRONG );
mbedtls_entropy_add_source(ctx, mbedtls_platform_entropy_poll, NULL,
MBEDTLS_ENTROPY_MIN_PLATFORM,
MBEDTLS_ENTROPY_SOURCE_STRONG);
#endif
#if defined(MBEDTLS_TIMING_C)
mbedtls_entropy_add_source( ctx, mbedtls_hardclock_poll, NULL,
MBEDTLS_ENTROPY_MIN_HARDCLOCK,
MBEDTLS_ENTROPY_SOURCE_WEAK );
mbedtls_entropy_add_source(ctx, mbedtls_hardclock_poll, NULL,
MBEDTLS_ENTROPY_MIN_HARDCLOCK,
MBEDTLS_ENTROPY_SOURCE_WEAK);
#endif
#if defined(MBEDTLS_HAVEGE_C)
mbedtls_entropy_add_source( ctx, mbedtls_havege_poll, &ctx->havege_data,
MBEDTLS_ENTROPY_MIN_HAVEGE,
MBEDTLS_ENTROPY_SOURCE_STRONG );
mbedtls_entropy_add_source(ctx, mbedtls_havege_poll, &ctx->havege_data,
MBEDTLS_ENTROPY_MIN_HAVEGE,
MBEDTLS_ENTROPY_SOURCE_STRONG);
#endif
#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
mbedtls_entropy_add_source( ctx, mbedtls_hardware_poll, NULL,
MBEDTLS_ENTROPY_MIN_HARDWARE,
MBEDTLS_ENTROPY_SOURCE_STRONG );
mbedtls_entropy_add_source(ctx, mbedtls_hardware_poll, NULL,
MBEDTLS_ENTROPY_MIN_HARDWARE,
MBEDTLS_ENTROPY_SOURCE_STRONG);
#endif
#if defined(MBEDTLS_ENTROPY_NV_SEED)
mbedtls_entropy_add_source( ctx, mbedtls_nv_seed_poll, NULL,
MBEDTLS_ENTROPY_BLOCK_SIZE,
MBEDTLS_ENTROPY_SOURCE_STRONG );
mbedtls_entropy_add_source(ctx, mbedtls_nv_seed_poll, NULL,
MBEDTLS_ENTROPY_BLOCK_SIZE,
MBEDTLS_ENTROPY_SOURCE_STRONG);
ctx->initial_entropy_run = 0;
#endif
#endif /* MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES */
}
void mbedtls_entropy_free( mbedtls_entropy_context *ctx )
void mbedtls_entropy_free(mbedtls_entropy_context *ctx)
{
/* If the context was already free, don't call free() again.
* This is important for mutexes which don't allow double-free. */
if( ctx->accumulator_started == -1 )
if (ctx->accumulator_started == -1) {
return;
}
#if defined(MBEDTLS_HAVEGE_C)
mbedtls_havege_free( &ctx->havege_data );
mbedtls_havege_free(&ctx->havege_data);
#endif
#if defined(MBEDTLS_THREADING_C)
mbedtls_mutex_free( &ctx->mutex );
mbedtls_mutex_free(&ctx->mutex);
#endif
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
mbedtls_sha512_free( &ctx->accumulator );
mbedtls_sha512_free(&ctx->accumulator);
#else
mbedtls_sha256_free( &ctx->accumulator );
mbedtls_sha256_free(&ctx->accumulator);
#endif
#if defined(MBEDTLS_ENTROPY_NV_SEED)
ctx->initial_entropy_run = 0;
#endif
ctx->source_count = 0;
mbedtls_platform_zeroize( ctx->source, sizeof( ctx->source ) );
mbedtls_platform_zeroize(ctx->source, sizeof(ctx->source));
ctx->accumulator_started = -1;
}
int mbedtls_entropy_add_source( mbedtls_entropy_context *ctx,
mbedtls_entropy_f_source_ptr f_source, void *p_source,
size_t threshold, int strong )
int mbedtls_entropy_add_source(mbedtls_entropy_context *ctx,
mbedtls_entropy_f_source_ptr f_source, void *p_source,
size_t threshold, int strong)
{
int idx, ret = 0;
#if defined(MBEDTLS_THREADING_C)
if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
return( ret );
if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
return ret;
}
#endif
idx = ctx->source_count;
if( idx >= MBEDTLS_ENTROPY_MAX_SOURCES )
{
if (idx >= MBEDTLS_ENTROPY_MAX_SOURCES) {
ret = MBEDTLS_ERR_ENTROPY_MAX_SOURCES;
goto exit;
}
@ -158,18 +159,19 @@ int mbedtls_entropy_add_source( mbedtls_entropy_context *ctx,
exit:
#if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
return MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
#endif
return( ret );
return ret;
}
/*
* Entropy accumulator update
*/
static int entropy_update( mbedtls_entropy_context *ctx, unsigned char source_id,
const unsigned char *data, size_t len )
static int entropy_update(mbedtls_entropy_context *ctx, unsigned char source_id,
const unsigned char *data, size_t len)
{
unsigned char header[2];
unsigned char tmp[MBEDTLS_ENTROPY_BLOCK_SIZE];
@ -177,14 +179,15 @@ static int entropy_update( mbedtls_entropy_context *ctx, unsigned char source_id
const unsigned char *p = data;
int ret = 0;
if( use_len > MBEDTLS_ENTROPY_BLOCK_SIZE )
{
if (use_len > MBEDTLS_ENTROPY_BLOCK_SIZE) {
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
if( ( ret = mbedtls_sha512_ret( data, len, tmp, 0 ) ) != 0 )
if ((ret = mbedtls_sha512_ret(data, len, tmp, 0)) != 0) {
goto cleanup;
}
#else
if( ( ret = mbedtls_sha256_ret( data, len, tmp, 0 ) ) != 0 )
if ((ret = mbedtls_sha256_ret(data, len, tmp, 0)) != 0) {
goto cleanup;
}
#endif
p = tmp;
use_len = MBEDTLS_ENTROPY_BLOCK_SIZE;
@ -199,55 +202,61 @@ static int entropy_update( mbedtls_entropy_context *ctx, unsigned char source_id
* gather entropy eventually execute this code.
*/
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
if( ctx->accumulator_started == 0 &&
( ret = mbedtls_sha512_starts_ret( &ctx->accumulator, 0 ) ) != 0 )
if (ctx->accumulator_started == 0 &&
(ret = mbedtls_sha512_starts_ret(&ctx->accumulator, 0)) != 0) {
goto cleanup;
else
} else {
ctx->accumulator_started = 1;
if( ( ret = mbedtls_sha512_update_ret( &ctx->accumulator, header, 2 ) ) != 0 )
}
if ((ret = mbedtls_sha512_update_ret(&ctx->accumulator, header, 2)) != 0) {
goto cleanup;
ret = mbedtls_sha512_update_ret( &ctx->accumulator, p, use_len );
}
ret = mbedtls_sha512_update_ret(&ctx->accumulator, p, use_len);
#else
if( ctx->accumulator_started == 0 &&
( ret = mbedtls_sha256_starts_ret( &ctx->accumulator, 0 ) ) != 0 )
if (ctx->accumulator_started == 0 &&
(ret = mbedtls_sha256_starts_ret(&ctx->accumulator, 0)) != 0) {
goto cleanup;
else
} else {
ctx->accumulator_started = 1;
if( ( ret = mbedtls_sha256_update_ret( &ctx->accumulator, header, 2 ) ) != 0 )
}
if ((ret = mbedtls_sha256_update_ret(&ctx->accumulator, header, 2)) != 0) {
goto cleanup;
ret = mbedtls_sha256_update_ret( &ctx->accumulator, p, use_len );
}
ret = mbedtls_sha256_update_ret(&ctx->accumulator, p, use_len);
#endif
cleanup:
mbedtls_platform_zeroize( tmp, sizeof( tmp ) );
mbedtls_platform_zeroize(tmp, sizeof(tmp));
return( ret );
return ret;
}
int mbedtls_entropy_update_manual( mbedtls_entropy_context *ctx,
const unsigned char *data, size_t len )
int mbedtls_entropy_update_manual(mbedtls_entropy_context *ctx,
const unsigned char *data, size_t len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#if defined(MBEDTLS_THREADING_C)
if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
return( ret );
if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
return ret;
}
#endif
ret = entropy_update( ctx, MBEDTLS_ENTROPY_SOURCE_MANUAL, data, len );
ret = entropy_update(ctx, MBEDTLS_ENTROPY_SOURCE_MANUAL, data, len);
#if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
return MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
#endif
return( ret );
return ret;
}
/*
* Run through the different sources to add entropy to our accumulator
*/
static int entropy_gather_internal( mbedtls_entropy_context *ctx )
static int entropy_gather_internal(mbedtls_entropy_context *ctx)
{
int ret = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
int i;
@ -255,121 +264,125 @@ static int entropy_gather_internal( mbedtls_entropy_context *ctx )
unsigned char buf[MBEDTLS_ENTROPY_MAX_GATHER];
size_t olen;
if( ctx->source_count == 0 )
return( MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED );
if (ctx->source_count == 0) {
return MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED;
}
/*
* Run through our entropy sources
*/
for( i = 0; i < ctx->source_count; i++ )
{
if( ctx->source[i].strong == MBEDTLS_ENTROPY_SOURCE_STRONG )
for (i = 0; i < ctx->source_count; i++) {
if (ctx->source[i].strong == MBEDTLS_ENTROPY_SOURCE_STRONG) {
have_one_strong = 1;
}
olen = 0;
if( ( ret = ctx->source[i].f_source( ctx->source[i].p_source,
buf, MBEDTLS_ENTROPY_MAX_GATHER, &olen ) ) != 0 )
{
if ((ret = ctx->source[i].f_source(ctx->source[i].p_source,
buf, MBEDTLS_ENTROPY_MAX_GATHER, &olen)) != 0) {
goto cleanup;
}
/*
* Add if we actually gathered something
*/
if( olen > 0 )
{
if( ( ret = entropy_update( ctx, (unsigned char) i,
buf, olen ) ) != 0 )
return( ret );
if (olen > 0) {
if ((ret = entropy_update(ctx, (unsigned char) i,
buf, olen)) != 0) {
return ret;
}
ctx->source[i].size += olen;
}
}
if( have_one_strong == 0 )
if (have_one_strong == 0) {
ret = MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE;
}
cleanup:
mbedtls_platform_zeroize( buf, sizeof( buf ) );
mbedtls_platform_zeroize(buf, sizeof(buf));
return( ret );
return ret;
}
/*
* Thread-safe wrapper for entropy_gather_internal()
*/
int mbedtls_entropy_gather( mbedtls_entropy_context *ctx )
int mbedtls_entropy_gather(mbedtls_entropy_context *ctx)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#if defined(MBEDTLS_THREADING_C)
if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
return( ret );
if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
return ret;
}
#endif
ret = entropy_gather_internal( ctx );
ret = entropy_gather_internal(ctx);
#if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
return MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
#endif
return( ret );
return ret;
}
int mbedtls_entropy_func( void *data, unsigned char *output, size_t len )
int mbedtls_entropy_func(void *data, unsigned char *output, size_t len)
{
int ret, count = 0, i, thresholds_reached;
size_t strong_size;
mbedtls_entropy_context *ctx = (mbedtls_entropy_context *) data;
unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
if( len > MBEDTLS_ENTROPY_BLOCK_SIZE )
return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
if (len > MBEDTLS_ENTROPY_BLOCK_SIZE) {
return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
}
#if defined(MBEDTLS_ENTROPY_NV_SEED)
/* Update the NV entropy seed before generating any entropy for outside
* use.
*/
if( ctx->initial_entropy_run == 0 )
{
if (ctx->initial_entropy_run == 0) {
ctx->initial_entropy_run = 1;
if( ( ret = mbedtls_entropy_update_nv_seed( ctx ) ) != 0 )
return( ret );
if ((ret = mbedtls_entropy_update_nv_seed(ctx)) != 0) {
return ret;
}
}
#endif
#if defined(MBEDTLS_THREADING_C)
if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
return( ret );
if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
return ret;
}
#endif
/*
* Always gather extra entropy before a call
*/
do
{
if( count++ > ENTROPY_MAX_LOOP )
{
do {
if (count++ > ENTROPY_MAX_LOOP) {
ret = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
goto exit;
}
if( ( ret = entropy_gather_internal( ctx ) ) != 0 )
if ((ret = entropy_gather_internal(ctx)) != 0) {
goto exit;
}
thresholds_reached = 1;
strong_size = 0;
for( i = 0; i < ctx->source_count; i++ )
{
if( ctx->source[i].size < ctx->source[i].threshold )
for (i = 0; i < ctx->source_count; i++) {
if (ctx->source[i].size < ctx->source[i].threshold) {
thresholds_reached = 0;
if( ctx->source[i].strong == MBEDTLS_ENTROPY_SOURCE_STRONG )
}
if (ctx->source[i].strong == MBEDTLS_ENTROPY_SOURCE_STRONG) {
strong_size += ctx->source[i].size;
}
}
}
while( ! thresholds_reached || strong_size < MBEDTLS_ENTROPY_BLOCK_SIZE );
} while (!thresholds_reached || strong_size < MBEDTLS_ENTROPY_BLOCK_SIZE);
memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
memset(buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE);
#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
/*
@ -377,109 +390,118 @@ int mbedtls_entropy_func( void *data, unsigned char *output, size_t len )
* in a previous call to entropy_update(). If this is not guaranteed, the
* code below will fail.
*/
if( ( ret = mbedtls_sha512_finish_ret( &ctx->accumulator, buf ) ) != 0 )
if ((ret = mbedtls_sha512_finish_ret(&ctx->accumulator, buf)) != 0) {
goto exit;
}
/*
* Reset accumulator and counters and recycle existing entropy
*/
mbedtls_sha512_free( &ctx->accumulator );
mbedtls_sha512_init( &ctx->accumulator );
if( ( ret = mbedtls_sha512_starts_ret( &ctx->accumulator, 0 ) ) != 0 )
mbedtls_sha512_free(&ctx->accumulator);
mbedtls_sha512_init(&ctx->accumulator);
if ((ret = mbedtls_sha512_starts_ret(&ctx->accumulator, 0)) != 0) {
goto exit;
if( ( ret = mbedtls_sha512_update_ret( &ctx->accumulator, buf,
MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
}
if ((ret = mbedtls_sha512_update_ret(&ctx->accumulator, buf,
MBEDTLS_ENTROPY_BLOCK_SIZE)) != 0) {
goto exit;
}
/*
* Perform second SHA-512 on entropy
*/
if( ( ret = mbedtls_sha512_ret( buf, MBEDTLS_ENTROPY_BLOCK_SIZE,
buf, 0 ) ) != 0 )
if ((ret = mbedtls_sha512_ret(buf, MBEDTLS_ENTROPY_BLOCK_SIZE,
buf, 0)) != 0) {
goto exit;
}
#else /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */
if( ( ret = mbedtls_sha256_finish_ret( &ctx->accumulator, buf ) ) != 0 )
if ((ret = mbedtls_sha256_finish_ret(&ctx->accumulator, buf)) != 0) {
goto exit;
}
/*
* Reset accumulator and counters and recycle existing entropy
*/
mbedtls_sha256_free( &ctx->accumulator );
mbedtls_sha256_init( &ctx->accumulator );
if( ( ret = mbedtls_sha256_starts_ret( &ctx->accumulator, 0 ) ) != 0 )
mbedtls_sha256_free(&ctx->accumulator);
mbedtls_sha256_init(&ctx->accumulator);
if ((ret = mbedtls_sha256_starts_ret(&ctx->accumulator, 0)) != 0) {
goto exit;
if( ( ret = mbedtls_sha256_update_ret( &ctx->accumulator, buf,
MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
}
if ((ret = mbedtls_sha256_update_ret(&ctx->accumulator, buf,
MBEDTLS_ENTROPY_BLOCK_SIZE)) != 0) {
goto exit;
}
/*
* Perform second SHA-256 on entropy
*/
if( ( ret = mbedtls_sha256_ret( buf, MBEDTLS_ENTROPY_BLOCK_SIZE,
buf, 0 ) ) != 0 )
if ((ret = mbedtls_sha256_ret(buf, MBEDTLS_ENTROPY_BLOCK_SIZE,
buf, 0)) != 0) {
goto exit;
}
#endif /* MBEDTLS_ENTROPY_SHA512_ACCUMULATOR */
for( i = 0; i < ctx->source_count; i++ )
for (i = 0; i < ctx->source_count; i++) {
ctx->source[i].size = 0;
}
memcpy( output, buf, len );
memcpy(output, buf, len);
ret = 0;
exit:
mbedtls_platform_zeroize( buf, sizeof( buf ) );
mbedtls_platform_zeroize(buf, sizeof(buf));
#if defined(MBEDTLS_THREADING_C)
if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
return MBEDTLS_ERR_THREADING_MUTEX_ERROR;
}
#endif
return( ret );
return ret;
}
#if defined(MBEDTLS_ENTROPY_NV_SEED)
int mbedtls_entropy_update_nv_seed( mbedtls_entropy_context *ctx )
int mbedtls_entropy_update_nv_seed(mbedtls_entropy_context *ctx)
{
int ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
/* Read new seed and write it to NV */
if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
return( ret );
if ((ret = mbedtls_entropy_func(ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE)) != 0) {
return ret;
}
if( mbedtls_nv_seed_write( buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) < 0 )
return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
if (mbedtls_nv_seed_write(buf, MBEDTLS_ENTROPY_BLOCK_SIZE) < 0) {
return MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
}
/* Manually update the remaining stream with a separator value to diverge */
memset( buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE );
ret = mbedtls_entropy_update_manual( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE );
memset(buf, 0, MBEDTLS_ENTROPY_BLOCK_SIZE);
ret = mbedtls_entropy_update_manual(ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE);
return( ret );
return ret;
}
#endif /* MBEDTLS_ENTROPY_NV_SEED */
#if defined(MBEDTLS_FS_IO)
int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *path )
int mbedtls_entropy_write_seed_file(mbedtls_entropy_context *ctx, const char *path)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
FILE *f = NULL;
unsigned char buf[MBEDTLS_ENTROPY_BLOCK_SIZE];
if( ( ret = mbedtls_entropy_func( ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE ) ) != 0 )
{
if ((ret = mbedtls_entropy_func(ctx, buf, MBEDTLS_ENTROPY_BLOCK_SIZE)) != 0) {
ret = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
goto exit;
}
if( ( f = fopen( path, "wb" ) ) == NULL )
{
if ((f = fopen(path, "wb")) == NULL) {
ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
goto exit;
}
if( fwrite( buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f ) != MBEDTLS_ENTROPY_BLOCK_SIZE )
{
if (fwrite(buf, 1, MBEDTLS_ENTROPY_BLOCK_SIZE, f) != MBEDTLS_ENTROPY_BLOCK_SIZE) {
ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
goto exit;
}
@ -487,44 +509,49 @@ int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *p
ret = 0;
exit:
mbedtls_platform_zeroize( buf, sizeof( buf ) );
mbedtls_platform_zeroize(buf, sizeof(buf));
if( f != NULL )
fclose( f );
if (f != NULL) {
fclose(f);
}
return( ret );
return ret;
}
int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *path )
int mbedtls_entropy_update_seed_file(mbedtls_entropy_context *ctx, const char *path)
{
int ret = 0;
FILE *f;
size_t n;
unsigned char buf[ MBEDTLS_ENTROPY_MAX_SEED_SIZE ];
unsigned char buf[MBEDTLS_ENTROPY_MAX_SEED_SIZE];
if( ( f = fopen( path, "rb" ) ) == NULL )
return( MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR );
if ((f = fopen(path, "rb")) == NULL) {
return MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
}
fseek( f, 0, SEEK_END );
n = (size_t) ftell( f );
fseek( f, 0, SEEK_SET );
fseek(f, 0, SEEK_END);
n = (size_t) ftell(f);
fseek(f, 0, SEEK_SET);
if( n > MBEDTLS_ENTROPY_MAX_SEED_SIZE )
if (n > MBEDTLS_ENTROPY_MAX_SEED_SIZE) {
n = MBEDTLS_ENTROPY_MAX_SEED_SIZE;
}
if( fread( buf, 1, n, f ) != n )
if (fread(buf, 1, n, f) != n) {
ret = MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR;
else
ret = mbedtls_entropy_update_manual( ctx, buf, n );
} else {
ret = mbedtls_entropy_update_manual(ctx, buf, n);
}
fclose( f );
fclose(f);
mbedtls_platform_zeroize( buf, sizeof( buf ) );
mbedtls_platform_zeroize(buf, sizeof(buf));
if( ret != 0 )
return( ret );
if (ret != 0) {
return ret;
}
return( mbedtls_entropy_write_seed_file( ctx, path ) );
return mbedtls_entropy_write_seed_file(ctx, path);
}
#endif /* MBEDTLS_FS_IO */
@ -533,60 +560,58 @@ int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *
/*
* Dummy source function
*/
static int entropy_dummy_source( void *data, unsigned char *output,
size_t len, size_t *olen )
static int entropy_dummy_source(void *data, unsigned char *output,
size_t len, size_t *olen)
{
((void) data);
memset( output, 0x2a, len );
memset(output, 0x2a, len);
*olen = len;
return( 0 );
return 0;
}
#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
static int mbedtls_entropy_source_self_test_gather( unsigned char *buf, size_t buf_len )
static int mbedtls_entropy_source_self_test_gather(unsigned char *buf, size_t buf_len)
{
int ret = 0;
size_t entropy_len = 0;
size_t olen = 0;
size_t attempts = buf_len;
while( attempts > 0 && entropy_len < buf_len )
{
if( ( ret = mbedtls_hardware_poll( NULL, buf + entropy_len,
buf_len - entropy_len, &olen ) ) != 0 )
return( ret );
while (attempts > 0 && entropy_len < buf_len) {
if ((ret = mbedtls_hardware_poll(NULL, buf + entropy_len,
buf_len - entropy_len, &olen)) != 0) {
return ret;
}
entropy_len += olen;
attempts--;
}
if( entropy_len < buf_len )
{
if (entropy_len < buf_len) {
ret = 1;
}
return( ret );
return ret;
}
static int mbedtls_entropy_source_self_test_check_bits( const unsigned char *buf,
size_t buf_len )
static int mbedtls_entropy_source_self_test_check_bits(const unsigned char *buf,
size_t buf_len)
{
unsigned char set= 0xFF;
unsigned char set = 0xFF;
unsigned char unset = 0x00;
size_t i;
for( i = 0; i < buf_len; i++ )
{
for (i = 0; i < buf_len; i++) {
set &= buf[i];
unset |= buf[i];
}
return( set == 0xFF || unset == 0x00 );
return set == 0xFF || unset == 0x00;
}
/*
@ -600,45 +625,50 @@ static int mbedtls_entropy_source_self_test_check_bits( const unsigned char *buf
* are not equal.
* - The error code returned by the entropy source is not an error.
*/
int mbedtls_entropy_source_self_test( int verbose )
int mbedtls_entropy_source_self_test(int verbose)
{
int ret = 0;
unsigned char buf0[2 * sizeof( unsigned long long int )];
unsigned char buf1[2 * sizeof( unsigned long long int )];
unsigned char buf0[2 * sizeof(unsigned long long int)];
unsigned char buf1[2 * sizeof(unsigned long long int)];
if( verbose != 0 )
mbedtls_printf( " ENTROPY_BIAS test: " );
if (verbose != 0) {
mbedtls_printf(" ENTROPY_BIAS test: ");
}
memset( buf0, 0x00, sizeof( buf0 ) );
memset( buf1, 0x00, sizeof( buf1 ) );
memset(buf0, 0x00, sizeof(buf0));
memset(buf1, 0x00, sizeof(buf1));
if( ( ret = mbedtls_entropy_source_self_test_gather( buf0, sizeof( buf0 ) ) ) != 0 )
if ((ret = mbedtls_entropy_source_self_test_gather(buf0, sizeof(buf0))) != 0) {
goto cleanup;
if( ( ret = mbedtls_entropy_source_self_test_gather( buf1, sizeof( buf1 ) ) ) != 0 )
}
if ((ret = mbedtls_entropy_source_self_test_gather(buf1, sizeof(buf1))) != 0) {
goto cleanup;
}
/* Make sure that the returned values are not all 0 or 1 */
if( ( ret = mbedtls_entropy_source_self_test_check_bits( buf0, sizeof( buf0 ) ) ) != 0 )
if ((ret = mbedtls_entropy_source_self_test_check_bits(buf0, sizeof(buf0))) != 0) {
goto cleanup;
if( ( ret = mbedtls_entropy_source_self_test_check_bits( buf1, sizeof( buf1 ) ) ) != 0 )
}
if ((ret = mbedtls_entropy_source_self_test_check_bits(buf1, sizeof(buf1))) != 0) {
goto cleanup;
}
/* Make sure that the entropy source is not returning values in a
* pattern */
ret = memcmp( buf0, buf1, sizeof( buf0 ) ) == 0;
ret = memcmp(buf0, buf1, sizeof(buf0)) == 0;
cleanup:
if( verbose != 0 )
{
if( ret != 0 )
mbedtls_printf( "failed\n" );
else
mbedtls_printf( "passed\n" );
if (verbose != 0) {
if (ret != 0) {
mbedtls_printf("failed\n");
} else {
mbedtls_printf("passed\n");
}
mbedtls_printf( "\n" );
mbedtls_printf("\n");
}
return( ret != 0 );
return ret != 0;
}
#endif /* MBEDTLS_ENTROPY_HARDWARE_ALT */
@ -648,7 +678,7 @@ cleanup:
* test that the functions don't cause errors and write the correct
* amount of data to buffers.
*/
int mbedtls_entropy_self_test( int verbose )
int mbedtls_entropy_self_test(int verbose)
{
int ret = 1;
#if !defined(MBEDTLS_TEST_NULL_ENTROPY)
@ -658,23 +688,27 @@ int mbedtls_entropy_self_test( int verbose )
size_t i, j;
#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
if( verbose != 0 )
mbedtls_printf( " ENTROPY test: " );
if (verbose != 0) {
mbedtls_printf(" ENTROPY test: ");
}
#if !defined(MBEDTLS_TEST_NULL_ENTROPY)
mbedtls_entropy_init( &ctx );
mbedtls_entropy_init(&ctx);
/* First do a gather to make sure we have default sources */
if( ( ret = mbedtls_entropy_gather( &ctx ) ) != 0 )
if ((ret = mbedtls_entropy_gather(&ctx)) != 0) {
goto cleanup;
}
ret = mbedtls_entropy_add_source( &ctx, entropy_dummy_source, NULL, 16,
MBEDTLS_ENTROPY_SOURCE_WEAK );
if( ret != 0 )
ret = mbedtls_entropy_add_source(&ctx, entropy_dummy_source, NULL, 16,
MBEDTLS_ENTROPY_SOURCE_WEAK);
if (ret != 0) {
goto cleanup;
}
if( ( ret = mbedtls_entropy_update_manual( &ctx, buf, sizeof buf ) ) != 0 )
if ((ret = mbedtls_entropy_update_manual(&ctx, buf, sizeof buf)) != 0) {
goto cleanup;
}
/*
* To test that mbedtls_entropy_func writes correct number of bytes:
@ -684,44 +718,44 @@ int mbedtls_entropy_self_test( int verbose )
* each of the 32 or 64 bytes to be non-zero has a false failure rate
* of at most 2^(-58) which is acceptable.
*/
for( i = 0; i < 8; i++ )
{
if( ( ret = mbedtls_entropy_func( &ctx, buf, sizeof( buf ) ) ) != 0 )
for (i = 0; i < 8; i++) {
if ((ret = mbedtls_entropy_func(&ctx, buf, sizeof(buf))) != 0) {
goto cleanup;
}
for( j = 0; j < sizeof( buf ); j++ )
for (j = 0; j < sizeof(buf); j++) {
acc[j] |= buf[j];
}
}
for( j = 0; j < sizeof( buf ); j++ )
{
if( acc[j] == 0 )
{
for (j = 0; j < sizeof(buf); j++) {
if (acc[j] == 0) {
ret = 1;
goto cleanup;
}
}
#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
if( ( ret = mbedtls_entropy_source_self_test( 0 ) ) != 0 )
if ((ret = mbedtls_entropy_source_self_test(0)) != 0) {
goto cleanup;
}
#endif
cleanup:
mbedtls_entropy_free( &ctx );
mbedtls_entropy_free(&ctx);
#endif /* !MBEDTLS_TEST_NULL_ENTROPY */
if( verbose != 0 )
{
if( ret != 0 )
mbedtls_printf( "failed\n" );
else
mbedtls_printf( "passed\n" );
if (verbose != 0) {
if (ret != 0) {
mbedtls_printf("failed\n");
} else {
mbedtls_printf("passed\n");
}
mbedtls_printf( "\n" );
mbedtls_printf("\n");
}
return( ret != 0 );
return ret != 0;
}
#endif /* MBEDTLS_SELF_TEST */