comparison nss/lib/freebl/chacha20/chacha20.c @ 0:1e5118fa0cb1

This is NSS with a Cmake Buildsyste To compile a static NSS library for Windows we've used the Chromium-NSS fork and added a Cmake buildsystem to compile it statically for Windows. See README.chromium for chromium changes and README.trustbridge for our modifications.
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 10:47:06 +0200
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1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
4
5 /* Adopted from the public domain code in NaCl by djb. */
6
7 #include <string.h>
8 #include <stdio.h>
9
10 #include "prtypes.h"
11 #include "chacha20.h"
12
13 #define ROTL32(v, n) (((v) << (n)) | ((v) >> (32 - (n))))
14 #define ROTATE(v, c) ROTL32((v), (c))
15 #define XOR(v, w) ((v) ^ (w))
16 #define PLUS(x, y) ((x) + (y))
17
18 #define U32TO8_LITTLE(p, v) \
19 { (p)[0] = ((v) ) & 0xff; (p)[1] = ((v) >> 8) & 0xff; \
20 (p)[2] = ((v) >> 16) & 0xff; (p)[3] = ((v) >> 24) & 0xff; }
21 #define U8TO32_LITTLE(p) \
22 (((PRUint32)((p)[0]) ) | ((PRUint32)((p)[1]) << 8) | \
23 ((PRUint32)((p)[2]) << 16) | ((PRUint32)((p)[3]) << 24) )
24
25 #define QUARTERROUND(a,b,c,d) \
26 x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]),16); \
27 x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]),12); \
28 x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]), 8); \
29 x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]), 7);
30
31 static void ChaChaCore(unsigned char output[64], const PRUint32 input[16],
32 int num_rounds) {
33 PRUint32 x[16];
34 int i;
35
36 memcpy(x, input, sizeof(PRUint32) * 16);
37 for (i = num_rounds; i > 0; i -= 2) {
38 QUARTERROUND( 0, 4, 8,12)
39 QUARTERROUND( 1, 5, 9,13)
40 QUARTERROUND( 2, 6,10,14)
41 QUARTERROUND( 3, 7,11,15)
42 QUARTERROUND( 0, 5,10,15)
43 QUARTERROUND( 1, 6,11,12)
44 QUARTERROUND( 2, 7, 8,13)
45 QUARTERROUND( 3, 4, 9,14)
46 }
47
48 for (i = 0; i < 16; ++i) {
49 x[i] = PLUS(x[i], input[i]);
50 }
51 for (i = 0; i < 16; ++i) {
52 U32TO8_LITTLE(output + 4 * i, x[i]);
53 }
54 }
55
56 static const unsigned char sigma[16] = "expand 32-byte k";
57
58 void ChaCha20XOR(unsigned char *out, const unsigned char *in, unsigned int inLen,
59 const unsigned char key[32], const unsigned char nonce[8],
60 uint64_t counter) {
61 unsigned char block[64];
62 PRUint32 input[16];
63 unsigned int u;
64 unsigned int i;
65
66 input[4] = U8TO32_LITTLE(key + 0);
67 input[5] = U8TO32_LITTLE(key + 4);
68 input[6] = U8TO32_LITTLE(key + 8);
69 input[7] = U8TO32_LITTLE(key + 12);
70
71 input[8] = U8TO32_LITTLE(key + 16);
72 input[9] = U8TO32_LITTLE(key + 20);
73 input[10] = U8TO32_LITTLE(key + 24);
74 input[11] = U8TO32_LITTLE(key + 28);
75
76 input[0] = U8TO32_LITTLE(sigma + 0);
77 input[1] = U8TO32_LITTLE(sigma + 4);
78 input[2] = U8TO32_LITTLE(sigma + 8);
79 input[3] = U8TO32_LITTLE(sigma + 12);
80
81 input[12] = counter;
82 input[13] = counter >> 32;
83 input[14] = U8TO32_LITTLE(nonce + 0);
84 input[15] = U8TO32_LITTLE(nonce + 4);
85
86 while (inLen >= 64) {
87 ChaChaCore(block, input, 20);
88 for (i = 0; i < 64; i++) {
89 out[i] = in[i] ^ block[i];
90 }
91
92 input[12]++;
93 if (input[12] == 0) {
94 input[13]++;
95 }
96
97 inLen -= 64;
98 in += 64;
99 out += 64;
100 }
101
102 if (inLen > 0) {
103 ChaChaCore(block, input, 20);
104 for (i = 0; i < inLen; i++) {
105 out[i] = in[i] ^ block[i];
106 }
107 }
108 }
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