X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=threefish256_enc.c;h=8bfbf9de471bad329a6490300d49c25f4e7358b0;hb=ff9f1b74e757f2f67b11c51f65b12fffaa02e18d;hp=2739f6a3d88cfa941f9818a25abe335914995042;hpb=d1d3ca64870a4cc4ee0659db7b4387e1dd51549f;p=avr-crypto-lib.git

diff --git a/threefish256_enc.c b/threefish256_enc.c
index 2739f6a..8bfbf9d 100644
--- a/threefish256_enc.c
+++ b/threefish256_enc.c
@@ -46,13 +46,17 @@ void permute_4(void* data){
 
 void threefish256_init(const void* key, const void* tweak, threefish256_ctx_t* ctx){
 	memcpy(ctx->k, key, 4*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[4] = THREEFISH_KEY_CONST;
 	for(i=0; i<4; ++i){
 		ctx->k[4] ^= K(i);
 	}
-	ctx->t[2] = T(0) ^ T(1);
 }
 
 static