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Introduce polarssl_zeroize() instead of memset() for zeroization

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This commit is contained in:
Paul Bakker 2014-06-13 17:20:13 +02:00
parent bbcb1ce703
commit 3461772559
36 changed files with 325 additions and 129 deletions
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15
library/sha256.c
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@ -48,6 +48,11 @@
#define polarssl_printf printf
#endif
/* Implementation that should never be optimized out by the compiler */
static void polarssl_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
#if !defined(POLARSSL_SHA256_ALT)
/*
@ -337,7 +342,7 @@ void sha256( const unsigned char *input, size_t ilen,
sha256_update( &ctx, input, ilen );
sha256_finish( &ctx, output );
memset( &ctx, 0, sizeof( sha256_context ) );
polarssl_zeroize( &ctx, sizeof( sha256_context ) );
}
#if defined(POLARSSL_FS_IO)
@ -361,7 +366,7 @@ int sha256_file( const char *path, unsigned char output[32], int is224 )
sha256_finish( &ctx, output );
memset( &ctx, 0, sizeof( sha256_context ) );
polarssl_zeroize( &ctx, sizeof( sha256_context ) );
if( ferror( f ) != 0 )
{
@ -402,7 +407,7 @@ void sha256_hmac_starts( sha256_context *ctx, const unsigned char *key,
sha256_starts( ctx, is224 );
sha256_update( ctx, ctx->ipad, 64 );
memset( sum, 0, sizeof( sum ) );
polarssl_zeroize( sum, sizeof( sum ) );
}
/*
@ -431,7 +436,7 @@ void sha256_hmac_finish( sha256_context *ctx, unsigned char output[32] )
sha256_update( ctx, tmpbuf, hlen );
sha256_finish( ctx, output );
memset( tmpbuf, 0, sizeof( tmpbuf ) );
polarssl_zeroize( tmpbuf, sizeof( tmpbuf ) );
}
/*
@ -456,7 +461,7 @@ void sha256_hmac( const unsigned char *key, size_t keylen,
sha256_hmac_update( &ctx, input, ilen );
sha256_hmac_finish( &ctx, output );
memset( &ctx, 0, sizeof( sha256_context ) );
polarssl_zeroize( &ctx, sizeof( sha256_context ) );
}
#if defined(POLARSSL_SELF_TEST)