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Slight cleanup of the DES code.

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This commit is contained in:
Dag-Erling Smørgrav 2017-03-19 13:00:27 +01:00
parent 548bf31631
commit 0d5f51697e
1 changed files with 14 additions and 14 deletions
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24
lib/cipher/cryb_des.c
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@ -214,7 +214,7 @@ static const uint32_t rhs[16] = {
/*
* Initial Permutation macro
*/
#define DES_IP(x,y) \
#define DES_IP(x, y) \
do { \
t = (x >> 4 ^ y) & 0x0f0f0f0f; y ^= t; x ^= t << 4; \
t = (x >> 16 ^ y) & 0x0000ffff; y ^= t; x ^= t << 16; \
@ -228,7 +228,7 @@ static const uint32_t rhs[16] = {
/*
* Final Permutation macro
*/
#define DES_FP(x,y) \
#define DES_FP(x, y) \
do { \
x = ror32(x, 1) & 0xffffffff; \
t = (x ^ y) & 0xaaaaaaaa; x ^= t; y ^= t; \
@ -242,17 +242,17 @@ static const uint32_t rhs[16] = {
/*
* DES round macro
*/
#define DES_ROUND(x,y) \
#define DES_ROUND(x, y) \
do { \
t = *sk++ ^ x; \
y ^= \
sb8[t & 0x3f] ^ \
sb8[t >> 0 & 0x3f] ^ \
sb6[t >> 8 & 0x3f] ^ \
sb4[t >> 16 & 0x3f] ^ \
sb2[t >> 24 & 0x3f]; \
t = *sk++ ^ ror32(x, 4); \
y ^= \
sb7[t & 0x3f] ^ \
sb7[t >> 0 & 0x3f] ^ \
sb5[t >> 8 & 0x3f] ^ \
sb3[t >> 16 & 0x3f] ^ \
sb1[t >> 24 & 0x3f]; \
@ -274,13 +274,13 @@ des_setkey(uint32_t sk[32], const uint8_t key[8])
/* permuted choice 1 */
t = (y >> 4 ^ x) & 0x0f0f0f0f; x ^= t; y ^= t << 4;
t = (y ^ x) & 0x10101010; x ^= t; y ^= t ;
x = lhs[x & 0xf] << 3 | lhs[x >> 8 & 0xf] << 2 |
lhs[x >> 16 & 0xf] << 1 | lhs[x >> 24 & 0xf] |
t = (y >> 0 ^ x) & 0x10101010; x ^= t; y ^= t << 0;
x = lhs[x >> 0 & 0xf] << 3 | lhs[x >> 8 & 0xf] << 2 |
lhs[x >> 16 & 0xf] << 1 | lhs[x >> 24 & 0xf] << 0 |
lhs[x >> 5 & 0xf] << 7 | lhs[x >> 13 & 0xf] << 6 |
lhs[x >> 21 & 0xf] << 5 | lhs[x >> 29 & 0xf] << 4;
y = rhs[y >> 1 & 0xf] << 3 | rhs[y >> 9 & 0xf] << 2 |
rhs[y >> 17 & 0xf] << 1 | rhs[y >> 25 & 0xf] |
rhs[y >> 17 & 0xf] << 1 | rhs[y >> 25 & 0xf] << 0 |
rhs[y >> 4 & 0xf] << 7 | rhs[y >> 12 & 0xf] << 6 |
rhs[y >> 20 & 0xf] << 5 | rhs[y >> 28 & 0xf] << 4;
x &= 0x0FFFFFFF;
@ -303,7 +303,7 @@ des_setkey(uint32_t sk[32], const uint8_t key[8])
(x << 2 & 0x00020000) | (x >> 10 & 0x00010000) |
(y >> 13 & 0x00002000) | (y >> 4 & 0x00001000) |
(y << 6 & 0x00000800) | (y >> 1 & 0x00000400) |
(y >> 14 & 0x00000200) | (y & 0x00000100) |
(y >> 14 & 0x00000200) | (y >> 0 & 0x00000100) |
(y >> 5 & 0x00000020) | (y >> 10 & 0x00000010) |
(y >> 3 & 0x00000008) | (y >> 18 & 0x00000004) |
(y >> 26 & 0x00000002) | (y >> 24 & 0x00000001);
@ -316,7 +316,7 @@ des_setkey(uint32_t sk[32], const uint8_t key[8])
(x << 15 & 0x00020000) | (x >> 4 & 0x00010000) |
(y >> 2 & 0x00002000) | (y << 8 & 0x00001000) |
(y >> 14 & 0x00000808) | (y >> 9 & 0x00000400) |
(y & 0x00000200) | (y << 7 & 0x00000100) |
(y >> 0 & 0x00000200) | (y << 7 & 0x00000100) |
(y >> 7 & 0x00000020) | (y >> 3 & 0x00000011) |
(y << 2 & 0x00000004) | (y >> 21 & 0x00000002);
}
@ -354,7 +354,7 @@ des_init(des_ctx *ctx, cipher_mode mode, const uint8_t *key, size_t keylen)
des_setkey(ctx->sk, key);
if (mode == CIPHER_MODE_DECRYPT) {
for (i = 0; i < 16; i += 2) {
SWAP(ctx->sk[i ], ctx->sk[30 - i]);
SWAP(ctx->sk[i + 0], ctx->sk[30 - i]);
SWAP(ctx->sk[i + 1], ctx->sk[31 - i]);
}
}