7 * \brief SHACAL1 encryption only implementation.
14 #include "shacal1_enc.h"
16 void shacal1_enc(void* buffer, void* key, uint16_t keysize_b){
17 sha1_ctx_t ctx, t_ctx;
19 memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
21 uint8_t keybuffer[SHA1_BLOCK_BITS/8];
22 memset(keybuffer, 0, SHA1_BLOCK_BITS/8);
23 if(keysize_b>SHA1_BLOCK_BITS)
24 keysize_b=SHA1_BLOCK_BITS;
25 memcpy(keybuffer, key, (keysize_b+7)/8);
27 memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
28 sha1_ctx2hash((sha1_hash_t*)(&(ctx.h[0])), &t_ctx);
29 memcpy(t_ctx.h, ctx.h, SHA1_HASH_BITS/8);
30 sha1_nextBlock(&ctx, keybuffer);
32 ctx.h[i] -= t_ctx.h[i];
33 sha1_ctx2hash(buffer, &ctx);