You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
1.3 KiB
69 lines
1.3 KiB
10 years ago
|
#if !defined(SCRYPT_CHOOSE_COMPILETIME) || !defined(SCRYPT_CHACHA_INCLUDED)
|
||
|
|
|
||
|
|
#undef SCRYPT_MIX
|
||
|
|
#define SCRYPT_MIX "ChaCha20/8 Ref"
|
||
|
|
|
||
|
|
#undef SCRYPT_CHACHA_INCLUDED
|
||
|
|
#define SCRYPT_CHACHA_INCLUDED
|
||
|
|
#define SCRYPT_CHACHA_BASIC
|
||
|
|
|
||
|
|
static void
|
||
|
|
chacha_core_basic(uint32_t state[16]) {
|
||
|
|
size_t rounds = 8;
|
||
|
|
uint32_t x0,x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12,x13,x14,x15,t;
|
||
|
|
|
||
|
|
x0 = state[0];
|
||
|
|
x1 = state[1];
|
||
|
|
x2 = state[2];
|
||
|
|
x3 = state[3];
|
||
|
|
x4 = state[4];
|
||
|
|
x5 = state[5];
|
||
|
|
x6 = state[6];
|
||
|
|
x7 = state[7];
|
||
|
|
x8 = state[8];
|
||
|
|
x9 = state[9];
|
||
|
|
x10 = state[10];
|
||
|
|
x11 = state[11];
|
||
|
|
x12 = state[12];
|
||
|
|
x13 = state[13];
|
||
|
|
x14 = state[14];
|
||
|
|
x15 = state[15];
|
||
|
|
|
||
|
|
#define quarter(a,b,c,d) \
|
||
|
|
a += b; t = d^a; d = ROTL32(t,16); \
|
||
|
|
c += d; t = b^c; b = ROTL32(t,12); \
|
||
|
|
a += b; t = d^a; d = ROTL32(t, 8); \
|
||
|
|
c += d; t = b^c; b = ROTL32(t, 7);
|
||
|
|
|
||
|
|
for (; rounds; rounds -= 2) {
|
||
|
|
quarter( x0, x4, x8,x12)
|
||
|
|
quarter( x1, x5, x9,x13)
|
||
|
|
quarter( x2, x6,x10,x14)
|
||
|
|
quarter( x3, x7,x11,x15)
|
||
|
|
quarter( x0, x5,x10,x15)
|
||
|
|
quarter( x1, x6,x11,x12)
|
||
|
|
quarter( x2, x7, x8,x13)
|
||
|
|
quarter( x3, x4, x9,x14)
|
||
|
|
}
|
||
|
|
|
||
|
|
state[0] += x0;
|
||
|
|
state[1] += x1;
|
||
|
|
state[2] += x2;
|
||
|
|
state[3] += x3;
|
||
|
|
state[4] += x4;
|
||
|
|
state[5] += x5;
|
||
|
|
state[6] += x6;
|
||
|
|
state[7] += x7;
|
||
|
|
state[8] += x8;
|
||
|
|
state[9] += x9;
|
||
|
|
state[10] += x10;
|
||
|
|
state[11] += x11;
|
||
|
|
state[12] += x12;
|
||
|
|
state[13] += x13;
|
||
|
|
state[14] += x14;
|
||
|
|
state[15] += x15;
|
||
|
|
|
||
|
|
#undef quarter
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|