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Modified to work in-place

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This commit is contained in:
Paul Bakker 2013-01-04 16:38:25 +01:00
parent 92be97b8e6
commit 09d67258a2
1 changed files with 5 additions and 11 deletions
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16
library/gcm.c
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@ -193,23 +193,14 @@ int gcm_crypt_and_tag( gcm_context *ctx,
size_t use_len;
size_t orig_len = length * 8;
size_t orig_add_len = add_len * 8;
unsigned char **xor_p;
memset( y, 0x00, 16 );
memset( work_buf, 0x00, 16 );
memset( tag, 0x00, tag_len );
memset( buf, 0x00, 16 );
if( ( mode == GCM_DECRYPT && output <= input && ( input - output ) < 8 ) ||
( output > input && (size_t) ( output - input ) < length ) )
{
if( output > input && (size_t) ( output - input ) < length )
return( POLARSSL_ERR_GCM_BAD_INPUT );
}
if( mode == GCM_ENCRYPT )
xor_p = (unsigned char **) &out_p;
else
xor_p = (unsigned char **) &p;
if( iv_len == 12 )
{
@ -271,8 +262,11 @@ int gcm_crypt_and_tag( gcm_context *ctx,
for( i = 0; i < use_len; i++ )
{
if( mode == GCM_DECRYPT )
buf[i] ^= p[i];
out_p[i] = ectr[i] ^ p[i];
buf[i] ^= (*xor_p)[i];
if( mode == GCM_ENCRYPT )
buf[i] ^= out_p[i];
}
gcm_mult( ctx, buf, buf );