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Diffstat (limited to 'libtomcrypt/src/ciphers/twofish/twofish.c')
-rw-r--r--libtomcrypt/src/ciphers/twofish/twofish.c80
1 files changed, 40 insertions, 40 deletions
diff --git a/libtomcrypt/src/ciphers/twofish/twofish.c b/libtomcrypt/src/ciphers/twofish/twofish.c
index 5331f91..b1584d1 100644
--- a/libtomcrypt/src/ciphers/twofish/twofish.c
+++ b/libtomcrypt/src/ciphers/twofish/twofish.c
@@ -7,9 +7,9 @@
* guarantee it works.
*/
- /**
+ /**
@file twofish.c
- Implementation of Twofish by Tom St Denis
+ Implementation of Twofish by Tom St Denis
*/
#include "tomcrypt.h"
@@ -145,14 +145,14 @@ static ulong32 gf_mult(ulong32 a, ulong32 b, ulong32 p)
result = P[0] = B[0] = 0;
/* unrolled branchless GF multiplier */
- result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
- result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
- result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
- result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
- result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
- result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
- result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
- result ^= B[a&1];
+ result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
+ result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
+ result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
+ result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
+ result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
+ result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
+ result ^= B[a&1]; a >>= 1; B[1] = P[B[1]>>7] ^ (B[1] << 1);
+ result ^= B[a&1];
return result;
}
@@ -243,7 +243,7 @@ static void h_func(const unsigned char *in, unsigned char *out, unsigned char *M
unsigned char y[4];
for (x = 0; x < 4; x++) {
y[x] = in[x];
- }
+ }
switch (k) {
case 4:
y[0] = (unsigned char)(sbox(1, (ulong32)y[0]) ^ M[4 * (6 + offset) + 0]);
@@ -439,7 +439,7 @@ int twofish_setup(const unsigned char *key, int keylen, int num_rounds, symmetri
/* small ram variant */
switch (k) {
case 4 : skey->twofish.start = 0; break;
- case 3 : skey->twofish.start = 1; break;
+ case 3 : skey->twofish.start = 1; break;
default: skey->twofish.start = 2; break;
}
#endif
@@ -473,18 +473,18 @@ int twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_ke
int r;
#if !defined(LTC_TWOFISH_SMALL) && !defined(__GNUC__)
ulong32 *S1, *S2, *S3, *S4;
-#endif
+#endif
LTC_ARGCHK(pt != NULL);
LTC_ARGCHK(ct != NULL);
LTC_ARGCHK(skey != NULL);
-
+
#if !defined(LTC_TWOFISH_SMALL) && !defined(__GNUC__)
S1 = skey->twofish.S[0];
S2 = skey->twofish.S[1];
S3 = skey->twofish.S[2];
S4 = skey->twofish.S[3];
-#endif
+#endif
LOAD32L(a,&pt[0]); LOAD32L(b,&pt[4]);
LOAD32L(c,&pt[8]); LOAD32L(d,&pt[12]);
@@ -492,20 +492,20 @@ int twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_ke
b ^= skey->twofish.K[1];
c ^= skey->twofish.K[2];
d ^= skey->twofish.K[3];
-
+
k = skey->twofish.K + 8;
for (r = 8; r != 0; --r) {
t2 = g1_func(b, skey);
t1 = g_func(a, skey) + t2;
c = RORc(c ^ (t1 + k[0]), 1);
d = ROLc(d, 1) ^ (t2 + t1 + k[1]);
-
+
t2 = g1_func(d, skey);
t1 = g_func(c, skey) + t2;
a = RORc(a ^ (t1 + k[2]), 1);
b = ROLc(b, 1) ^ (t2 + t1 + k[3]);
k += 4;
- }
+ }
/* output with "undo last swap" */
ta = c ^ skey->twofish.K[4];
@@ -533,7 +533,7 @@ int twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_ke
Decrypts a block of text with Twofish
@param ct The input ciphertext (16 bytes)
@param pt The output plaintext (16 bytes)
- @param skey The key as scheduled
+ @param skey The key as scheduled
@return CRYPT_OK if successful
*/
#ifdef LTC_CLEAN_STACK
@@ -546,18 +546,18 @@ int twofish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_ke
int r;
#if !defined(LTC_TWOFISH_SMALL) && !defined(__GNUC__)
ulong32 *S1, *S2, *S3, *S4;
-#endif
+#endif
LTC_ARGCHK(pt != NULL);
LTC_ARGCHK(ct != NULL);
LTC_ARGCHK(skey != NULL);
-
+
#if !defined(LTC_TWOFISH_SMALL) && !defined(__GNUC__)
S1 = skey->twofish.S[0];
S2 = skey->twofish.S[1];
S3 = skey->twofish.S[2];
S4 = skey->twofish.S[3];
-#endif
+#endif
/* load input */
LOAD32L(ta,&ct[0]); LOAD32L(tb,&ct[4]);
@@ -588,7 +588,7 @@ int twofish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_ke
b ^= skey->twofish.K[1];
c ^= skey->twofish.K[2];
d ^= skey->twofish.K[3];
-
+
/* store */
STORE32L(a, &pt[0]); STORE32L(b, &pt[4]);
STORE32L(c, &pt[8]); STORE32L(d, &pt[12]);
@@ -612,8 +612,8 @@ int twofish_test(void)
{
#ifndef LTC_TEST
return CRYPT_NOP;
- #else
- static const struct {
+ #else
+ static const struct {
int keylen;
unsigned char key[32], pt[16], ct[16];
} tests[] = {
@@ -633,7 +633,7 @@ int twofish_test(void)
0x85, 0xB6, 0xDC, 0x07, 0x3C, 0xA3, 0x41, 0xB2 },
{ 0x18, 0x2B, 0x02, 0xD8, 0x14, 0x97, 0xEA, 0x45,
0xF9, 0xDA, 0xAC, 0xDC, 0x29, 0x19, 0x3A, 0x65 }
- }, {
+ }, {
32,
{ 0xD4, 0x3B, 0xB7, 0x55, 0x6E, 0xA3, 0x2E, 0x46,
0xF2, 0xA2, 0x82, 0xB7, 0xD4, 0x5B, 0x4E, 0x0D,
@@ -647,11 +647,11 @@ int twofish_test(void)
};
- symmetric_key key;
- unsigned char tmp[2][16];
- int err, i, y;
-
- for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
+ symmetric_key key;
+ unsigned char tmp[2][16];
+ int err, i, y;
+
+ for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
if ((err = twofish_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) {
return err;
}
@@ -661,17 +661,17 @@ int twofish_test(void)
compare_testvector(tmp[1], 16, tests[i].pt, 16, "Twofish Decrypt", i) != 0) {
return CRYPT_FAIL_TESTVECTOR;
}
- /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
- for (y = 0; y < 16; y++) tmp[0][y] = 0;
- for (y = 0; y < 1000; y++) twofish_ecb_encrypt(tmp[0], tmp[0], &key);
- for (y = 0; y < 1000; y++) twofish_ecb_decrypt(tmp[0], tmp[0], &key);
- for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
- }
- return CRYPT_OK;
-#endif
+ /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
+ for (y = 0; y < 16; y++) tmp[0][y] = 0;
+ for (y = 0; y < 1000; y++) twofish_ecb_encrypt(tmp[0], tmp[0], &key);
+ for (y = 0; y < 1000; y++) twofish_ecb_decrypt(tmp[0], tmp[0], &key);
+ for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
+ }
+ return CRYPT_OK;
+#endif
}
-/** Terminate the context
+/** Terminate the context
@param skey The scheduled key
*/
void twofish_done(symmetric_key *skey)
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