libsodium: Needed for Dnscrypto-proxy Release 1.3.0
[tomato.git] / release / src / router / libsodium / src / libsodium / crypto_core / hsalsa20 / ref2 / core_hsalsa20.c
blobc9bd359ee42d745237f73cf5b525ba0fb0286adb
1 /*
2 version 20080912
3 D. J. Bernstein
4 Public domain.
5 */
7 #include "api.h"
9 #define ROUNDS 20
11 typedef unsigned int uint32;
13 static uint32 rotate(uint32 u,int c)
15 return (u << c) | (u >> (32 - c));
18 static uint32 load_littleendian(const unsigned char *x)
20 return
21 (uint32) (x[0]) \
22 | (((uint32) (x[1])) << 8) \
23 | (((uint32) (x[2])) << 16) \
24 | (((uint32) (x[3])) << 24)
28 static void store_littleendian(unsigned char *x,uint32 u)
30 x[0] = u; u >>= 8;
31 x[1] = u; u >>= 8;
32 x[2] = u; u >>= 8;
33 x[3] = u;
36 int crypto_core(
37 unsigned char *out,
38 const unsigned char *in,
39 const unsigned char *k,
40 const unsigned char *c
43 uint32 x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
44 int i;
46 x0 = load_littleendian(c + 0);
47 x1 = load_littleendian(k + 0);
48 x2 = load_littleendian(k + 4);
49 x3 = load_littleendian(k + 8);
50 x4 = load_littleendian(k + 12);
51 x5 = load_littleendian(c + 4);
52 x6 = load_littleendian(in + 0);
53 x7 = load_littleendian(in + 4);
54 x8 = load_littleendian(in + 8);
55 x9 = load_littleendian(in + 12);
56 x10 = load_littleendian(c + 8);
57 x11 = load_littleendian(k + 16);
58 x12 = load_littleendian(k + 20);
59 x13 = load_littleendian(k + 24);
60 x14 = load_littleendian(k + 28);
61 x15 = load_littleendian(c + 12);
63 for (i = ROUNDS;i > 0;i -= 2) {
64 x4 ^= rotate( x0+x12, 7);
65 x8 ^= rotate( x4+ x0, 9);
66 x12 ^= rotate( x8+ x4,13);
67 x0 ^= rotate(x12+ x8,18);
68 x9 ^= rotate( x5+ x1, 7);
69 x13 ^= rotate( x9+ x5, 9);
70 x1 ^= rotate(x13+ x9,13);
71 x5 ^= rotate( x1+x13,18);
72 x14 ^= rotate(x10+ x6, 7);
73 x2 ^= rotate(x14+x10, 9);
74 x6 ^= rotate( x2+x14,13);
75 x10 ^= rotate( x6+ x2,18);
76 x3 ^= rotate(x15+x11, 7);
77 x7 ^= rotate( x3+x15, 9);
78 x11 ^= rotate( x7+ x3,13);
79 x15 ^= rotate(x11+ x7,18);
80 x1 ^= rotate( x0+ x3, 7);
81 x2 ^= rotate( x1+ x0, 9);
82 x3 ^= rotate( x2+ x1,13);
83 x0 ^= rotate( x3+ x2,18);
84 x6 ^= rotate( x5+ x4, 7);
85 x7 ^= rotate( x6+ x5, 9);
86 x4 ^= rotate( x7+ x6,13);
87 x5 ^= rotate( x4+ x7,18);
88 x11 ^= rotate(x10+ x9, 7);
89 x8 ^= rotate(x11+x10, 9);
90 x9 ^= rotate( x8+x11,13);
91 x10 ^= rotate( x9+ x8,18);
92 x12 ^= rotate(x15+x14, 7);
93 x13 ^= rotate(x12+x15, 9);
94 x14 ^= rotate(x13+x12,13);
95 x15 ^= rotate(x14+x13,18);
98 store_littleendian(out + 0,x0);
99 store_littleendian(out + 4,x5);
100 store_littleendian(out + 8,x10);
101 store_littleendian(out + 12,x15);
102 store_littleendian(out + 16,x6);
103 store_littleendian(out + 20,x7);
104 store_littleendian(out + 24,x8);
105 store_littleendian(out + 28,x9);
107 return 0;