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- Made crypt_and_cipher more robust with other ciphers / hashes

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This commit is contained in:
Paul Bakker 2012-07-04 17:08:33 +00:00
parent 83f00bba9c
commit 26c4e3cb0b
1 changed files with 24 additions and 9 deletions
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33
programs/aes/crypt_and_hash.c
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@ -300,9 +300,17 @@ int main( int argc, char *argv[] )
memset( key, 0, sizeof( key ) ); memset( key, 0, sizeof( key ) );
cipher_setkey( &cipher_ctx, digest, cipher_info->key_length, if( cipher_setkey( &cipher_ctx, digest, cipher_info->key_length,
POLARSSL_ENCRYPT ); POLARSSL_ENCRYPT ) != 0 )
cipher_reset( &cipher_ctx, IV); {
fprintf( stderr, "cipher_setkey() returned error\n");
goto exit;
}
if( cipher_reset( &cipher_ctx, IV ) != 0 )
{
fprintf( stderr, "cipher_reset() returned error\n");
goto exit;
}
md_hmac_starts( &md_ctx, digest, 32 ); md_hmac_starts( &md_ctx, digest, 32 );
@ -330,7 +338,11 @@ int main( int argc, char *argv[] )
} }
} }
cipher_finish( &cipher_ctx, output, &olen ); if( cipher_finish( &cipher_ctx, output, &olen ) != 0 )
{
fprintf( stderr, "cipher_finish() returned error\n" );
goto exit;
}
md_hmac_update( &md_ctx, output, olen ); md_hmac_update( &md_ctx, output, olen );
if( fwrite( output, 1, olen, fout ) != olen ) if( fwrite( output, 1, olen, fout ) != olen )
@ -338,14 +350,15 @@ int main( int argc, char *argv[] )
fprintf( stderr, "fwrite(%ld bytes) failed\n", (long) olen ); fprintf( stderr, "fwrite(%ld bytes) failed\n", (long) olen );
goto exit; goto exit;
} }
/* /*
* Finally write the HMAC. * Finally write the HMAC.
*/ */
md_hmac_finish( &md_ctx, digest ); md_hmac_finish( &md_ctx, digest );
if( fwrite( digest, 1, md_get_size( md_info), fout ) != md_get_size( md_info) ) if( fwrite( digest, 1, md_get_size( md_info ), fout ) != md_get_size( md_info ) )
{ {
fprintf( stderr, "fwrite(%d bytes) failed\n", md_get_size( md_info) ); fprintf( stderr, "fwrite(%d bytes) failed\n", md_get_size( md_info ) );
goto exit; goto exit;
} }
} }
@ -361,15 +374,17 @@ int main( int argc, char *argv[] )
* N*16 .. (N+1)*16 - 1 AES Encrypted Block #N * N*16 .. (N+1)*16 - 1 AES Encrypted Block #N
* (N+1)*16 .. (N+1)*16 + 32 HMAC-SHA-256(ciphertext) * (N+1)*16 .. (N+1)*16 + 32 HMAC-SHA-256(ciphertext)
*/ */
if( filesize < 16 + md_get_size( md_info) ) if( filesize < 16 + md_get_size( md_info ) )
{ {
fprintf( stderr, "File too short to be encrypted.\n" ); fprintf( stderr, "File too short to be encrypted.\n" );
goto exit; goto exit;
} }
if( ( filesize & 0x0F ) != 0 ) if( ( ( filesize - md_get_size( md_info ) ) %
cipher_get_block_size( &cipher_ctx ) ) != 0 )
{ {
fprintf( stderr, "File size not a multiple of 16.\n" ); fprintf( stderr, "File content not a multiple of the block size (%d).\n",
cipher_get_block_size( &cipher_ctx ));
goto exit; goto exit;
} }