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annotate nss/lib/freebl/chacha20/chacha20.c @ 1:247cffdc9b89

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Add a pesodo config file for inlcude directories and library names
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 13:00:06 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* This Source Code Form is subject to the terms of the Mozilla Public
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2 * License, v. 2.0. If a copy of the MPL was not distributed with this
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3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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4
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5 /* Adopted from the public domain code in NaCl by djb. */
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6
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7 #include <string.h>
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8 #include <stdio.h>
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9
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10 #include "prtypes.h"
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11 #include "chacha20.h"
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12
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13 #define ROTL32(v, n) (((v) << (n)) | ((v) >> (32 - (n))))
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14 #define ROTATE(v, c) ROTL32((v), (c))
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15 #define XOR(v, w) ((v) ^ (w))
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16 #define PLUS(x, y) ((x) + (y))
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17
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18 #define U32TO8_LITTLE(p, v) \
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19 { (p)[0] = ((v) ) & 0xff; (p)[1] = ((v) >> 8) & 0xff; \
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20 (p)[2] = ((v) >> 16) & 0xff; (p)[3] = ((v) >> 24) & 0xff; }
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21 #define U8TO32_LITTLE(p) \
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22 (((PRUint32)((p)[0]) ) | ((PRUint32)((p)[1]) << 8) | \
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23 ((PRUint32)((p)[2]) << 16) | ((PRUint32)((p)[3]) << 24) )
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24
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25 #define QUARTERROUND(a,b,c,d) \
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26 x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]),16); \
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27 x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]),12); \
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28 x[a] = PLUS(x[a],x[b]); x[d] = ROTATE(XOR(x[d],x[a]), 8); \
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29 x[c] = PLUS(x[c],x[d]); x[b] = ROTATE(XOR(x[b],x[c]), 7);
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30
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31 static void ChaChaCore(unsigned char output[64], const PRUint32 input[16],
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32 int num_rounds) {
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33 PRUint32 x[16];
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34 int i;
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35
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36 memcpy(x, input, sizeof(PRUint32) * 16);
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37 for (i = num_rounds; i > 0; i -= 2) {
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38 QUARTERROUND( 0, 4, 8,12)
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39 QUARTERROUND( 1, 5, 9,13)
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40 QUARTERROUND( 2, 6,10,14)
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41 QUARTERROUND( 3, 7,11,15)
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42 QUARTERROUND( 0, 5,10,15)
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43 QUARTERROUND( 1, 6,11,12)
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44 QUARTERROUND( 2, 7, 8,13)
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45 QUARTERROUND( 3, 4, 9,14)
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46 }
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47
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48 for (i = 0; i < 16; ++i) {
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49 x[i] = PLUS(x[i], input[i]);
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50 }
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51 for (i = 0; i < 16; ++i) {
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52 U32TO8_LITTLE(output + 4 * i, x[i]);
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53 }
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54 }
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55
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56 static const unsigned char sigma[16] = "expand 32-byte k";
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57
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58 void ChaCha20XOR(unsigned char *out, const unsigned char *in, unsigned int inLen,
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59 const unsigned char key[32], const unsigned char nonce[8],
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60 uint64_t counter) {
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61 unsigned char block[64];
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62 PRUint32 input[16];
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63 unsigned int u;
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64 unsigned int i;
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65
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66 input[4] = U8TO32_LITTLE(key + 0);
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67 input[5] = U8TO32_LITTLE(key + 4);
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68 input[6] = U8TO32_LITTLE(key + 8);
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69 input[7] = U8TO32_LITTLE(key + 12);
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70
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71 input[8] = U8TO32_LITTLE(key + 16);
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72 input[9] = U8TO32_LITTLE(key + 20);
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73 input[10] = U8TO32_LITTLE(key + 24);
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74 input[11] = U8TO32_LITTLE(key + 28);
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75
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76 input[0] = U8TO32_LITTLE(sigma + 0);
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77 input[1] = U8TO32_LITTLE(sigma + 4);
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78 input[2] = U8TO32_LITTLE(sigma + 8);
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79 input[3] = U8TO32_LITTLE(sigma + 12);
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80
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81 input[12] = counter;
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82 input[13] = counter >> 32;
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83 input[14] = U8TO32_LITTLE(nonce + 0);
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84 input[15] = U8TO32_LITTLE(nonce + 4);
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85
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86 while (inLen >= 64) {
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87 ChaChaCore(block, input, 20);
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88 for (i = 0; i < 64; i++) {
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89 out[i] = in[i] ^ block[i];
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90 }
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91
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92 input[12]++;
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93 if (input[12] == 0) {
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94 input[13]++;
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95 }
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96
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97 inLen -= 64;
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98 in += 64;
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99 out += 64;
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100 }
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101
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102 if (inLen > 0) {
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103 ChaChaCore(block, input, 20);
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104 for (i = 0; i < inLen; i++) {
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105 out[i] = in[i] ^ block[i];
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106 }
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107 }
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108 }
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