7 * \brief SHACAL2 encryption only implementation.
14 #include "shacal2_enc.h"
17 void shacal2_enc(void* buffer, void* key, uint16_t keysize_b){
19 sha256_ctx_t ctx, t_ctx;
20 memcpy(ctx.h, buffer, SHACAL2_BLOCKSIZE_B);
22 uint8_t keybuffer[SHACAL2_KEYSIZE_B];
23 memset(keybuffer, 0, SHACAL2_KEYSIZE_B);
24 if(keysize_b>SHACAL2_KEYSIZE)
25 keysize_b=SHACAL2_KEYSIZE;
26 memcpy(keybuffer, key, (keysize_b+7)/8);
28 memcpy(t_ctx.h, buffer, SHACAL2_BLOCKSIZE_B);
29 sha256_ctx2hash((sha256_hash_t*)(&(ctx.h[0])), &t_ctx);
30 memcpy(t_ctx.h, ctx.h, SHACAL2_BLOCKSIZE_B);
31 sha256_nextBlock(&ctx, keybuffer);
32 for(i=0; i<SHACAL2_BLOCKSIZE/32; ++i){
33 ctx.h[i] -= t_ctx.h[i];
35 sha256_ctx2hash(buffer, &ctx);