Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/freebl/chacha20poly1305.c @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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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 #ifdef FREEBL_NO_DEPEND
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6 #include "stubs.h"
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7 #endif
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8
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9 #include <string.h>
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10 #include <stdio.h>
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11
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12 #include "seccomon.h"
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13 #include "secerr.h"
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14 #include "blapit.h"
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15 #include "poly1305/poly1305.h"
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16 #include "chacha20/chacha20.h"
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17 #include "chacha20poly1305.h"
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18
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19 /* Poly1305Do writes the Poly1305 authenticator of the given additional data
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20 * and ciphertext to |out|. */
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21 static void
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22 Poly1305Do(unsigned char *out,
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23 const unsigned char *ad, unsigned int adLen,
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24 const unsigned char *ciphertext, unsigned int ciphertextLen,
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25 const unsigned char key[32])
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26 {
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27 poly1305_state state;
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28 unsigned int j;
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29 unsigned char lengthBytes[8];
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30 unsigned int i;
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31
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32 Poly1305Init(&state, key);
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33 j = adLen;
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34 for (i = 0; i < sizeof(lengthBytes); i++) {
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35 lengthBytes[i] = j;
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36 j >>= 8;
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37 }
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38 Poly1305Update(&state, ad, adLen);
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39 Poly1305Update(&state, lengthBytes, sizeof(lengthBytes));
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40 j = ciphertextLen;
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41 for (i = 0; i < sizeof(lengthBytes); i++) {
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42 lengthBytes[i] = j;
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43 j >>= 8;
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44 }
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45 Poly1305Update(&state, ciphertext, ciphertextLen);
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46 Poly1305Update(&state, lengthBytes, sizeof(lengthBytes));
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47 Poly1305Finish(&state, out);
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48 }
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49
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50 SECStatus
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51 ChaCha20Poly1305_InitContext(ChaCha20Poly1305Context *ctx,
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52 const unsigned char *key, unsigned int keyLen,
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53 unsigned int tagLen)
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54 {
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55 if (keyLen != 32) {
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56 PORT_SetError(SEC_ERROR_BAD_KEY);
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57 return SECFailure;
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58 }
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59 if (tagLen == 0 || tagLen > 16) {
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60 PORT_SetError(SEC_ERROR_INPUT_LEN);
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61 return SECFailure;
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62 }
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63
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64 memcpy(ctx->key, key, sizeof(ctx->key));
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65 ctx->tagLen = tagLen;
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66
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67 return SECSuccess;
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68 }
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69
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70 ChaCha20Poly1305Context *
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71 ChaCha20Poly1305_CreateContext(const unsigned char *key, unsigned int keyLen,
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72 unsigned int tagLen)
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73 {
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74 ChaCha20Poly1305Context *ctx;
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75
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76 ctx = PORT_New(ChaCha20Poly1305Context);
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77 if (ctx == NULL) {
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78 return NULL;
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79 }
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80
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81 if (ChaCha20Poly1305_InitContext(ctx, key, keyLen, tagLen) != SECSuccess) {
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82 PORT_Free(ctx);
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83 ctx = NULL;
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84 }
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85
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86 return ctx;
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87 }
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88
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89 void
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90 ChaCha20Poly1305_DestroyContext(ChaCha20Poly1305Context *ctx, PRBool freeit)
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91 {
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92 memset(ctx, 0, sizeof(*ctx));
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93 if (freeit) {
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94 PORT_Free(ctx);
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95 }
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96 }
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97
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98 SECStatus
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99 ChaCha20Poly1305_Seal(const ChaCha20Poly1305Context *ctx,
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100 unsigned char *output, unsigned int *outputLen,
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101 unsigned int maxOutputLen,
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102 const unsigned char *input, unsigned int inputLen,
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103 const unsigned char *nonce, unsigned int nonceLen,
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104 const unsigned char *ad, unsigned int adLen)
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105 {
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106 unsigned char block[64];
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107 unsigned char tag[16];
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108
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109 if (nonceLen != 8) {
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110 PORT_SetError(SEC_ERROR_INPUT_LEN);
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111 return SECFailure;
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112 }
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113 *outputLen = inputLen + ctx->tagLen;
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114 if (maxOutputLen < *outputLen) {
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115 PORT_SetError(SEC_ERROR_OUTPUT_LEN);
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116 return SECFailure;
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117 }
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118
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119 memset(block, 0, sizeof(block));
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120 // Generate a block of keystream. The first 32 bytes will be the poly1305
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121 // key. The remainder of the block is discarded.
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122 ChaCha20XOR(block, block, sizeof(block), ctx->key, nonce, 0);
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123 ChaCha20XOR(output, input, inputLen, ctx->key, nonce, 1);
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124
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125 Poly1305Do(tag, ad, adLen, output, inputLen, block);
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126 memcpy(output + inputLen, tag, ctx->tagLen);
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127
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128 return SECSuccess;
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129 }
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130
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131 SECStatus
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132 ChaCha20Poly1305_Open(const ChaCha20Poly1305Context *ctx,
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133 unsigned char *output, unsigned int *outputLen,
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134 unsigned int maxOutputLen,
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135 const unsigned char *input, unsigned int inputLen,
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136 const unsigned char *nonce, unsigned int nonceLen,
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137 const unsigned char *ad, unsigned int adLen)
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138 {
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139 unsigned char block[64];
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140 unsigned char tag[16];
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141
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142 if (nonceLen != 8) {
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143 PORT_SetError(SEC_ERROR_INPUT_LEN);
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144 return SECFailure;
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145 }
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146 if (inputLen < ctx->tagLen) {
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147 PORT_SetError(SEC_ERROR_INPUT_LEN);
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148 return SECFailure;
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149 }
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150 *outputLen = inputLen - ctx->tagLen;
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151 if (maxOutputLen < *outputLen) {
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152 PORT_SetError(SEC_ERROR_OUTPUT_LEN);
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153 return SECFailure;
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154 }
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155
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156 memset(block, 0, sizeof(block));
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157 // Generate a block of keystream. The first 32 bytes will be the poly1305
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158 // key. The remainder of the block is discarded.
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159 ChaCha20XOR(block, block, sizeof(block), ctx->key, nonce, 0);
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160 Poly1305Do(tag, ad, adLen, input, inputLen - ctx->tagLen, block);
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161 if (NSS_SecureMemcmp(tag, &input[inputLen - ctx->tagLen], ctx->tagLen) != 0) {
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162 PORT_SetError(SEC_ERROR_BAD_DATA);
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163 return SECFailure;
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164 }
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165
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166 ChaCha20XOR(output, input, inputLen - ctx->tagLen, ctx->key, nonce, 1);
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167
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168 return SECSuccess;
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169 }
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