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Modified to work in-place
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@ -193,23 +193,14 @@ int gcm_crypt_and_tag( gcm_context *ctx,
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size_t use_len;
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size_t orig_len = length * 8;
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size_t orig_add_len = add_len * 8;
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unsigned char **xor_p;
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memset( y, 0x00, 16 );
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memset( work_buf, 0x00, 16 );
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memset( tag, 0x00, tag_len );
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memset( buf, 0x00, 16 );
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if( ( mode == GCM_DECRYPT && output <= input && ( input - output ) < 8 ) ||
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( output > input && (size_t) ( output - input ) < length ) )
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{
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if( output > input && (size_t) ( output - input ) < length )
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return( POLARSSL_ERR_GCM_BAD_INPUT );
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}
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if( mode == GCM_ENCRYPT )
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xor_p = (unsigned char **) &out_p;
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else
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xor_p = (unsigned char **) &p;
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if( iv_len == 12 )
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{
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@ -271,8 +262,11 @@ int gcm_crypt_and_tag( gcm_context *ctx,
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for( i = 0; i < use_len; i++ )
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{
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if( mode == GCM_DECRYPT )
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buf[i] ^= p[i];
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out_p[i] = ectr[i] ^ p[i];
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buf[i] ^= (*xor_p)[i];
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if( mode == GCM_ENCRYPT )
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buf[i] ^= out_p[i];
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}
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gcm_mult( ctx, buf, buf );
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