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#include <threefishApi.h>
#include <stdlib.h>
#include <string.h>
void threefishSetKey(ThreefishKey_t* keyCtx, ThreefishSize_t stateSize,
uint64_t* keyData, uint64_t* tweak)
{
int keyWords = stateSize / 64;
int i;
uint64_t parity = KeyScheduleConst;
keyCtx->tweak[0] = tweak[0];
keyCtx->tweak[1] = tweak[1];
keyCtx->tweak[2] = tweak[0] ^ tweak[1];
for (i = 0; i < keyWords; i++) {
keyCtx->key[i] = keyData[i];
parity ^= keyData[i];
}
keyCtx->key[i] = parity;
keyCtx->stateSize = stateSize;
}
void threefishEncryptBlockBytes(ThreefishKey_t* keyCtx, uint8_t* in,
uint8_t* out)
{
u64b_t plain[SKEIN_MAX_STATE_WORDS]; /* max number of words*/
u64b_t cipher[SKEIN_MAX_STATE_WORDS];
Skein_Get64_LSB_First(plain, in, keyCtx->stateSize / 64); /* bytes to words */
threefishEncryptBlockWords(keyCtx, plain, cipher);
Skein_Put64_LSB_First(out, cipher, keyCtx->stateSize / 8); /* words to bytes */
}
void threefishEncryptBlockWords(ThreefishKey_t* keyCtx, uint64_t* in,
uint64_t* out)
{
switch (keyCtx->stateSize) {
case Threefish256:
threefishEncrypt256(keyCtx, in, out);
break;
case Threefish512:
threefishEncrypt512(keyCtx, in, out);
break;
case Threefish1024:
threefishEncrypt1024(keyCtx, in, out);
break;
}
}
void threefishDecryptBlockBytes(ThreefishKey_t* keyCtx, uint8_t* in,
uint8_t* out)
{
u64b_t plain[SKEIN_MAX_STATE_WORDS]; /* max number of words*/
u64b_t cipher[SKEIN_MAX_STATE_WORDS];
Skein_Get64_LSB_First(cipher, in, keyCtx->stateSize / 64); /* bytes to words */
threefishDecryptBlockWords(keyCtx, cipher, plain);
Skein_Put64_LSB_First(out, plain, keyCtx->stateSize / 8); /* words to bytes */
}
void threefishDecryptBlockWords(ThreefishKey_t* keyCtx, uint64_t* in,
uint64_t* out)
{
switch (keyCtx->stateSize) {
case Threefish256:
threefishDecrypt256(keyCtx, in, out);
break;
case Threefish512:
threefishDecrypt512(keyCtx, in, out);
break;
case Threefish1024:
threefishDecrypt1024(keyCtx, in, out);
break;
}
}
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