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- Addedd writing and updating of seedfiles as functions to CTR_DRBG

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This commit is contained in:
Paul Bakker
2011-12-05 13:23:51 +00:00
parent 1c70d409ad
commit fc754a9178
4 changed files with 105 additions and 1 deletions
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57
library/ctr_drbg.c
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@ -34,6 +34,10 @@
#include "polarssl/ctr_drbg.h"
#if defined(POLARSSL_FS_IO)
#include <stdio.h>
#endif
int ctr_drbg_init( ctr_drbg_context *ctx,
int (*f_entropy)(void *, unsigned char *, size_t),
void *p_entropy,
@ -329,6 +333,59 @@ int ctr_drbg_random( void *p_rng, unsigned char *output, size_t output_len )
return ctr_drbg_random_with_add( p_rng, output, output_len, NULL, 0 );
}
#if defined(POLARSSL_FS_IO)
int ctr_drbg_write_seed_file( ctr_drbg_context *ctx, const char *path )
{
int ret;
FILE *f;
unsigned char buf[ CTR_DRBG_MAX_INPUT ];
if( ( f = fopen( path, "wb" ) ) == NULL )
return( 1 );
if( ( ret = ctr_drbg_random( ctx, buf, CTR_DRBG_MAX_INPUT ) ) != 0 )
return( ret );
if( fwrite( buf, 1, CTR_DRBG_MAX_INPUT, f ) != CTR_DRBG_MAX_INPUT )
{
fclose( f );
return( 1 );
}
fclose( f );
return( 0 );
}
int ctr_drbg_update_seed_file( ctr_drbg_context *ctx, const char *path )
{
FILE *f;
size_t n;
unsigned char buf[ CTR_DRBG_MAX_INPUT ];
if( ( f = fopen( path, "rb" ) ) == NULL )
return( 1 );
fseek( f, 0, SEEK_END );
n = (size_t) ftell( f );
fseek( f, 0, SEEK_SET );
if( n > CTR_DRBG_MAX_INPUT )
return( POLARSSL_ERR_CTR_DRBG_INPUT_TOO_BIG );
if( fread( buf, 1, n, f ) != n )
{
fclose( f );
return( 1 );
}
ctr_drbg_update( ctx, buf, n );
fclose( f );
return( ctr_drbg_write_seed_file( ctx, path ) );
}
#endif /* POLARSSL_FS_IO */
#if defined(POLARSSL_SELF_TEST)
#include <stdio.h>