X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=arcfour.c;h=93b2e26bd2e1cd61c34bf8d5bc761c22486b5675;hb=0f66a12e93ed43904c30810ac33c79c87befafe7;hp=13fb159e7aff4e559e69e91327935e2feb93aca9;hpb=4d76909e4282baf1420ee309e270384246b241b8;p=avr-crypto-lib.git

diff --git a/arcfour.c b/arcfour.c
index 13fb159..93b2e26 100644
--- a/arcfour.c
+++ b/arcfour.c
@@ -33,15 +33,16 @@
  * length is length of key in bytes!
  */
 
-void arcfour_init(arcfour_ctx_t *ctx, void *key, uint8_t length_B){
+void arcfour_init(const void *key, uint8_t length_B, arcfour_ctx_t *ctx){
 	uint8_t t;
-	unsigned x,y=0;
+	uint16_t x,y=0;
 	for(x=0; x<= 255; ++x)
 		ctx->s[x]=x;
 	
 	for(x=0; x<= 255; ++x){
 		y += ctx->s[x] + ((uint8_t*)key)[x % length_B];
 		y &= 0xff;
+		/* ctx->s[y] <--> ctx->s[x] */
 		t = ctx->s[y];
 		ctx->s[y] = ctx->s[x];
 		ctx->s[x] = t;
@@ -53,6 +54,7 @@ uint8_t arcfour_gen(arcfour_ctx_t *ctx){
 	uint8_t t;
 	ctx->i++;
 	ctx->j += ctx->s[ctx->i];
+	/* ctx->s[i] <--> ctx->s[j] */
 	t = ctx->s[ctx->j];
 	ctx->s[ctx->j] = ctx->s[ctx->i];
 	ctx->s[ctx->i] = t;