X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=threefish512_enc.c;h=620276fed44a24cf2174c7eae8b482e12d0707fe;hb=ed07adb6f2aeaf61da0e482cec328120bfeb860e;hp=fb044b59e2c57a24669a3ce29464cc804267ad08;hpb=ba4ac1b4a8020026fb6f1a45a1e04e16017262f7;p=avr-crypto-lib.git

diff --git a/threefish512_enc.c b/threefish512_enc.c
index fb044b5..620276f 100644
--- a/threefish512_enc.c
+++ b/threefish512_enc.c
@@ -68,13 +68,17 @@ void permute_inv8(void* data){
 
 void threefish512_init(const void* key, const void* tweak, threefish512_ctx_t* ctx){
 	memcpy(ctx->k, key, 8*8);
-	memcpy(ctx->t, tweak, 2*8);
+	if(tweak){
+		memcpy(ctx->t, tweak, 2*8);
+		ctx->t[2] = T(0) ^ T(1);
+	}else{
+		memset(ctx->t, 0, 3*8);
+	}
 	uint8_t i;
 	ctx->k[8] = THREEFISH_KEY_CONST;
 	for(i=0; i<8; ++i){
 		ctx->k[8] ^= K(i);
 	}
-	ctx->t[2] = T(0) ^ T(1);
 }
 
 static