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Create speck.c

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a not good speck.c
This commit is contained in:
laiwei360735
2017-03-20 17:14:31 +08:00
committed by Simon
parent 73002a1b05
commit 2855074a54
1 changed files with 60 additions and 0 deletions
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demos/mycipher/speck.c Normal file
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#include "speck.h"
#define ROR(x, r) ((x >> r) | (x << ((sizeof(SPECK_TYPE) * 8) - r)))//循环右移
#define ROL(x, r) ((x << r) | (x >> ((sizeof(SPECK_TYPE) * 8) - r)))//循环左移
#ifdef SPECK_32_64
#define R(x, y, k) (x = ROR(x, 7), x += y, x ^= k, y = ROL(y, 2), y ^= x)
#define RR(x, y, k) (y ^= x, y = ROR(y, 2), x ^= k, x -= y, x = ROL(x, 7))
#else
#define R(x, y, k) (x = ROR(x, 8), x += y, x ^= k, y = ROL(y, 3), y ^= x)
#define RR(x, y, k) (y ^= x, y = ROR(y, 3), x ^= k, x -= y, x = ROL(x, 8))
#endif
void mycipher_set_encrypt_key(mycipher_key_t *key, const unsigned char *user_key)
{
int i;
for (i = 0; i < num_word; i++)
{
if (user_key[i] == '\0')
break;
key->rk[i] = user_key[i];
}
int j = 0;
for (; i < num_word; i++)
{
key->rk[i] = user_key[j++];
}
}
void speck_expand(SPECK_TYPE const K[ SPECK_KEY_LEN], SPECK_TYPE S[ SPECK_ROUNDS])
{
SPECK_TYPE i, b = K[0];
SPECK_TYPE a[SPECK_KEY_LEN - 1];
for (i = 0; i < (SPECK_KEY_LEN - 1); i++)
{
a[i] = K[i + 1];
}
S[0] = b;
for (i = 0; i < SPECK_ROUNDS - 1; i++) {
R(a[i % (SPECK_KEY_LEN - 1)], b, i);
S[i + 1] = b;
}
}
void speck_encrypt(SPECK_TYPE const pt[ 2], SPECK_TYPE ct[ 2], SPECK_TYPE const K[ SPECK_ROUNDS])
{
SPECK_TYPE i;
ct[0] = pt[0]; ct[1] = pt[1];
for (i = 0; i < SPECK_ROUNDS; i++){
R(ct[1], ct[0], K[i]);
}
}
void speck_decrypt(SPECK_TYPE const ct[ 2], SPECK_TYPE pt[ 2], SPECK_TYPE const K[ SPECK_ROUNDS])
{
SPECK_TYPE i;
pt[0] = ct[0]; pt[1] = ct[1];
for (i = 0; i < SPECK_ROUNDS; i++){
RR(pt[1], pt[0], K[(SPECK_ROUNDS - 1) - i]);
}
}