+#include "noekeon.h"
+#include "omac_noekeon.h"
+#include "memxor.h"
+#include <string.h>
+#include <stdint.h>
+
+
+void omac_noekeon_init(omac_noekeon_ctx_t* ctx){
+ memset(ctx, 0, 16);
+}
+
+
+void omac_noekeon_tweak(uint8_t t, const void* key, omac_noekeon_ctx_t* ctx){
+ *ctx[15] = t;
+ noekeon_enc(ctx, key);
+}
+
+void omac_noekeon_next(const void* buffer, const void* key, omac_noekeon_ctx_t* ctx){
+ memxor(ctx, buffer, 16);
+ noekeon_enc(ctx, key);
+}
+
+static
+void omac_noekeon_comppad(uint8_t* pad, const void* key, uint8_t length_b){
+ uint8_t c1,c2,r,j;
+ memset(pad, 0, 16);
+ noekeon_enc(pad, key);
+ r=(length_b==128)?1:2;
+ for(;r!=0;--r){
+ c1=0;
+ for(j=0;j<16;++j){
+ c2 = c1;
+ c1 = (pad[15-j])>>7;
+ pad[15-j] = ((pad[15-j])<<1) | c2;
+ }
+ if(c1){
+ pad[15] ^= 0x87;
+ }
+ }
+ if(length_b<128){
+ pad[(length_b)/8] ^= 0x80 >> (length_b%8);
+ }
+}
+
+void omac_noekeon_last(const void* buffer, uint8_t length_b, const void* key, omac_noekeon_ctx_t* ctx){
+ while(length_b>128){
+ omac_noekeon_next(buffer, key, ctx);
+ buffer = (uint8_t*)buffer +16;
+ length_b -= 128;
+ }
+ uint8_t pad[16];
+ omac_noekeon_comppad(pad, key, length_b);
+ memxor(pad, buffer, (length_b+7)/8);
+ omac_noekeon_next(pad, key, ctx);
+}
+
+
+void omac_noekeon(void* dest, const void* msg, uint16_t msglength_b,
+ const void* key, uint8_t t){
+ omac_noekeon_init(dest);
+ if(t!=0xff)
+ omac_noekeon_tweak(t,key,dest);
+ while(msglength_b>128){
+ omac_noekeon_next(msg, key, dest);
+ msg = (uint8_t*)msg +16;
+ msglength_b -= 128;
+ }
+ omac_noekeon_last(msg, msglength_b, key, dest);
+}
+
+
+
+
+