155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
/* twister-small.c */
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#include <stdint.h>
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#include <string.h>
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#include "memxor.h"
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#include "twister-small.h"
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static
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void maxi_round3(twister_state_t* ctx, void* msg, uint8_t last_null){
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mini_round(ctx, msg);
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msg = ((uint8_t*)msg) + 8;
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mini_round(ctx, msg);
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if(last_null){
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blank_round(ctx);
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} else {
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msg = ((uint8_t*)msg) + 8;
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mini_round(ctx, msg);
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}
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}
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void twister_small_nextBlock(twister_state_t* ctx, void* msg){
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uint8_t tmp[8][8];
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/* round 1 */
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memcpy(tmp, ctx->s, 64);
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maxi_round3(ctx, msg, 0);
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memxor(ctx->s, tmp, 64);
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msg = ((uint8_t*)msg) + 3*8;
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/* round 2 */
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memcpy(tmp, ctx->s, 64);
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maxi_round3(ctx, msg, 0);
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memxor(ctx->s, tmp, 64);
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msg = ((uint8_t*)msg) + 3*8;
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/* round 3 */
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memcpy(tmp, ctx->s, 64);
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maxi_round3(ctx, msg, 1);
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memxor(ctx->s, tmp, 64);
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ctx->length_counter_b += 512;
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}
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void twister_small_init(twister_state_t* ctx, uint16_t hashsize_b){
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memset(ctx->s, 0, 64);
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ctx->counter=0xffffffffffffffffLL;
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ctx->s[0][7] = hashsize_b>>8;
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ctx->s[1][7] = hashsize_b&0xff;
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ctx->length_counter_b = 0;
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}
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void twister_small_lastBlock(twister_state_t* ctx, void* msg, uint16_t length_b){
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uint8_t tmp[64];
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while(length_b>512){
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twister_small_nextBlock(ctx, msg);
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msg = ((uint8_t*)msg)+64;
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length_b -= 512;
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}
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memset(tmp, 0, 64);
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memcpy(tmp, msg, (length_b+7)/8);
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tmp[length_b/8] |= 0x80 >> (length_b&0x07);
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twister_small_nextBlock(ctx, tmp);
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ctx->length_counter_b -= 512 - length_b;
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mini_round(ctx, &(ctx->length_counter_b));
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blank_round(ctx);
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}
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void twister_small_ctx2hash(void* dest, twister_state_t* ctx, uint16_t hashsize_b){
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uint8_t tmp[8][8];
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uint8_t j;
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uint16_t i=hashsize_b;
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while(i>=64){
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i-=64;
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memcpy(tmp,ctx->s, 64);
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blank_round(ctx);
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memxor(ctx->s, tmp, 64);
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blank_round(ctx);
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for(j=0; j<8; ++j){
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*((uint8_t*)dest) = ctx->s[7-j][0] ^ tmp[7-j][0];
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dest = (uint8_t*)dest + 1;
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}
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}
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if(i>=32){
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memcpy(tmp,ctx->s, 64);
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blank_round(ctx);
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memxor(ctx->s, tmp, 64);
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blank_round(ctx);
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for(j=0; j<4; ++j){
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*((uint8_t*)dest) = ctx->s[3-j][0] ^ tmp[3-j][0];
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dest = (uint8_t*)dest + 1;
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}
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}
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}
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#ifndef NO_TWISTER_256
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void twister256_init(twister256_ctx_t* ctx){
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twister_small_init(ctx, 256);
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}
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void twister256_nextBlock(twister256_ctx_t* ctx, void* msg){
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twister_small_nextBlock(ctx, msg);
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}
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void twister256_lastBlock(twister256_ctx_t* ctx, void* msg, uint16_t length_b){
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twister_small_lastBlock(ctx, msg, length_b);
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}
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void twister256_ctx2hash(void* dest, twister256_ctx_t* ctx){
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twister_small_ctx2hash(dest, ctx, 256);
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}
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void twister256(void* dest, void* msg, uint32_t msg_length_b){
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twister_state_t ctx;
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twister_small_init(&ctx, 256);
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while(msg_length_b >=512){
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twister_small_nextBlock(&ctx, msg);
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msg = (uint8_t*)msg + 512/8;
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msg_length_b -= 512;
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}
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twister_small_lastBlock(&ctx, msg, msg_length_b);
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twister_small_ctx2hash(dest, &ctx, 256);
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}
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#endif
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#ifndef NO_TWISTER_224
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void twister224_init(twister224_ctx_t* ctx){
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twister_small_init(ctx, 224);
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}
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void twister224_nextBlock(twister224_ctx_t* ctx, void* msg){
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twister_small_nextBlock(ctx, msg);
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}
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void twister224_lastBlock(twister224_ctx_t* ctx, void* msg, uint16_t length_b){
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twister_small_lastBlock(ctx, msg, length_b);
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}
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void twister224_ctx2hash(void* dest, twister224_ctx_t* ctx){
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twister_small_ctx2hash(dest, ctx, 224);
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}
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void twister224(void* dest, void* msg, uint32_t msg_length_b){
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twister_state_t ctx;
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twister_small_init(&ctx, 224);
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while(msg_length_b >=512){
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twister_small_nextBlock(&ctx, msg);
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msg = (uint8_t*)msg + 512/8;
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msg_length_b -= 512;
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}
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twister_small_lastBlock(&ctx, msg, msg_length_b);
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twister_small_ctx2hash(dest, &ctx, 224);
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}
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#endif
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