-const uint8_t keccak_rc_comp[] PROGMEM = {
- 0x01, 0x92, 0xda, 0x70,
- 0x9b, 0x21, 0xf1, 0x59,
- 0x8a, 0x88, 0x39, 0x2a,
- 0xbb, 0xcb, 0xd9, 0x53,
- 0x52, 0xc0, 0x1a, 0x6a,
- 0xf1, 0xd0, 0x21, 0x78,
-};
-/*
-const uint8_t keccak_rotate_codes[5][5] PROGMEM = {
- { ROT_CODE( 0), ROT_CODE(36), ROT_CODE( 3), ROT_CODE(41), ROT_CODE(18) },
- { ROT_CODE( 1), ROT_CODE(44), ROT_CODE(10), ROT_CODE(45), ROT_CODE( 2) },
- { ROT_CODE(62), ROT_CODE( 6), ROT_CODE(43), ROT_CODE(15), ROT_CODE(61) },
- { ROT_CODE(28), ROT_CODE(55), ROT_CODE(25), ROT_CODE(21), ROT_CODE(56) },
- { ROT_CODE(27), ROT_CODE(20), ROT_CODE(39), ROT_CODE( 8), ROT_CODE(14) }
-};
-*/
-const uint8_t keccak_rotate_codes[5][5] PROGMEM = {
- { ROT_CODE( 0), ROT_CODE( 1), ROT_CODE(62), ROT_CODE(28), ROT_CODE(27) },
- { ROT_CODE(36), ROT_CODE(44), ROT_CODE( 6), ROT_CODE(55), ROT_CODE(20) },
- { ROT_CODE( 3), ROT_CODE(10), ROT_CODE(43), ROT_CODE(25), ROT_CODE(39) },
- { ROT_CODE(41), ROT_CODE(45), ROT_CODE(15), ROT_CODE(21), ROT_CODE( 8) },
- { ROT_CODE(18), ROT_CODE( 2), ROT_CODE(61), ROT_CODE(56), ROT_CODE(14) }
-};
-
-void keccak_f1600(uint64_t a[5][5]);
-
-void keccak_nextBlock(keccak_ctx_t* ctx, const void* block){
- memxor(ctx->a, block, ctx->bs);
- keccak_f1600(ctx->a);
+void keccak_lastBlock(keccak_ctx_t* ctx, const void* block, uint16_t length_b){
+ uint8_t length_B;
+ while(length_b >= ctx->r){
+ keccak_nextBlock(ctx, block);
+ block = (uint8_t*)block + ctx->bs;
+ length_b -= ctx->r;
+ }
+ length_B = length_b / 8;
+ memxor(ctx->a, block, length_B);
+ /* append 1 */
+ if(length_b & 7){
+ /* we have some single bits */
+ uint8_t t;
+ t = ((uint8_t*)block)[length_B] >> (8 - (length_b & 7));
+ t |= 0x01 << (length_b & 7);
+ ctx->a[length_B] ^= t;
+ }else{
+ ctx->a[length_B] ^= 0x01;
+ }
+ if(length_b == ctx->r - 1){
+ keccak_f1600(ctx->a);
+ }
+ ctx->a[ctx->bs - 1] ^= 0x80;
+ keccak_f1600(ctx->a);