void lnc_cast6_dec(void *context) {
lnc_cast6_ctx_t *ctx = context;
int i;
for(i = 11; i > 5; i--)
Q(ctx, i);
for(i = 5; i >= 0; i--)
QBAR(ctx, i);
}
void lnc_cast6_enc(void *context) {
lnc_cast6_ctx_t *ctx = context;
int i;
for(i = 0; i < 6; i++)
Q(ctx, i);
for(i = 6; i < 12; i++)
QBAR(ctx, i);
}
static void cast6_decrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf) {
struct cast6_ctx * c = crypto_tfm_ctx(tfm);
const __be32 *src = (const __be32 *)inbuf;
__be32 *dst = (__be32 *)outbuf;
u32 block[4];
u32 * Km;
u8 * Kr;
block[0] = be32_to_cpu(src[0]);
block[1] = be32_to_cpu(src[1]);
block[2] = be32_to_cpu(src[2]);
block[3] = be32_to_cpu(src[3]);
Km = c->Km[11]; Kr = c->Kr[11]; Q (block, Kr, Km);
Km = c->Km[10]; Kr = c->Kr[10]; Q (block, Kr, Km);
Km = c->Km[9]; Kr = c->Kr[9]; Q (block, Kr, Km);
Km = c->Km[8]; Kr = c->Kr[8]; Q (block, Kr, Km);
Km = c->Km[7]; Kr = c->Kr[7]; Q (block, Kr, Km);
Km = c->Km[6]; Kr = c->Kr[6]; Q (block, Kr, Km);
Km = c->Km[5]; Kr = c->Kr[5]; QBAR (block, Kr, Km);
Km = c->Km[4]; Kr = c->Kr[4]; QBAR (block, Kr, Km);
Km = c->Km[3]; Kr = c->Kr[3]; QBAR (block, Kr, Km);
Km = c->Km[2]; Kr = c->Kr[2]; QBAR (block, Kr, Km);
Km = c->Km[1]; Kr = c->Kr[1]; QBAR (block, Kr, Km);
Km = c->Km[0]; Kr = c->Kr[0]; QBAR (block, Kr, Km);
dst[0] = cpu_to_be32(block[0]);
dst[1] = cpu_to_be32(block[1]);
dst[2] = cpu_to_be32(block[2]);
dst[3] = cpu_to_be32(block[3]);
}
std::string CAST256::run(const std::string & DATA){
if (!keyset){
throw std::runtime_error("Error: Key has not been set.");
}
if (DATA.size() != 16){
throw std::runtime_error("Error: Data must be 128 bits in length.");
}
A = toint(DATA.substr(0, 4), 256);
B = toint(DATA.substr(4, 4), 256);
C = toint(DATA.substr(8, 4), 256);
D = toint(DATA.substr(12, 4), 256);
for(uint8_t i = 0; i < 6; i++){
Q(i);
}
for(uint8_t i = 6; i < 12; i++){
QBAR(i);
}
return unhexlify(makehex(A, 8) + makehex(B, 8) + makehex(C, 8) + makehex(D, 8));
}