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Add hmac_drbg_{write,update}_seed_file()

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This commit is contained in:
Manuel Pégourié-Gonnard 2014-01-30 21:11:16 +01:00
parent fef0f8f55a
commit 48bc3e81da
7 changed files with 157 additions and 0 deletions
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63
library/hmac_drbg.c
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@ -35,6 +35,10 @@
#include "polarssl/hmac_drbg.h"
#if defined(POLARSSL_FS_IO)
#include <stdio.h>
#endif
/*
* HMAC_DRBG update, using optional additional data (10.1.2.2)
*/
@ -284,6 +288,65 @@ void hmac_drbg_free( hmac_drbg_context *ctx )
memset( ctx, 0, sizeof( hmac_drbg_context ) );
}
#if defined(POLARSSL_FS_IO)
int hmac_drbg_write_seed_file( hmac_drbg_context *ctx, const char *path )
{
int ret = POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR;
FILE *f;
unsigned char buf[ POLARSSL_HMAC_DRBG_MAX_INPUT ];
if( ( f = fopen( path, "wb" ) ) == NULL )
return( POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR );
if( ( ret = hmac_drbg_random( ctx, buf, sizeof( buf ) ) ) != 0 )
goto exit;
if( fwrite( buf, 1, sizeof( buf ), f ) != sizeof( buf ) )
{
ret = POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR;
goto exit;
}
ret = 0;
exit:
fclose( f );
return( ret );
}
int hmac_drbg_update_seed_file( hmac_drbg_context *ctx, const char *path )
{
FILE *f;
size_t n;
unsigned char buf[ POLARSSL_HMAC_DRBG_MAX_INPUT ];
if( ( f = fopen( path, "rb" ) ) == NULL )
return( POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR );
fseek( f, 0, SEEK_END );
n = (size_t) ftell( f );
fseek( f, 0, SEEK_SET );
if( n > POLARSSL_HMAC_DRBG_MAX_INPUT )
{
fclose( f );
return( POLARSSL_ERR_HMAC_DRBG_INPUT_TOO_BIG );
}
if( fread( buf, 1, n, f ) != n )
{
fclose( f );
return( POLARSSL_ERR_HMAC_DRBG_FILE_IO_ERROR );
}
fclose( f );
hmac_drbg_update( ctx, buf, n );
return( hmac_drbg_write_seed_file( ctx, path ) );
}
#endif /* POLARSSL_FS_IO */
#if defined(POLARSSL_SELF_TEST)