X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=threefish1024_enc.c;h=41a35902d695752987360b67ca5c9e2a5ac91177;hb=ff9f1b74e757f2f67b11c51f65b12fffaa02e18d;hp=0bb8e9b262decf6f65bc40e4cda0a237066818b1;hpb=d1d3ca64870a4cc4ee0659db7b4387e1dd51549f;p=avr-crypto-lib.git

diff --git a/threefish1024_enc.c b/threefish1024_enc.c
index 0bb8e9b..41a3590 100644
--- a/threefish1024_enc.c
+++ b/threefish1024_enc.c
@@ -62,13 +62,17 @@ void permute_16(void* data){
 
 void threefish1024_init(const void* key, const void* tweak, threefish1024_ctx_t* ctx){
 	memcpy(ctx->k, key, 16*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, 0, 3*8);
+	}
 	uint8_t i;
 	ctx->k[16] = THREEFISH_KEY_CONST;
 	for(i=0; i<16; ++i){
 		ctx->k[16] ^= K(i);
 	}
-	ctx->t[2] = T(0) ^ T(1);
 }
 
 static