Mercurial > dropbear
annotate libtomcrypt/src/mac/poly1305/poly1305.c @ 1696:d18fa38c1fd4
initialise variable to stop warning
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 28 May 2020 22:02:03 +0800 (2020-05-28) |
parents | 6dba84798cd5 |
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rev | line source |
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1471
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 */ |
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9 |
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10 /* The implementation is based on: |
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11 * Public Domain poly1305 from Andrew Moon |
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12 * https://github.com/floodyberry/poly1305-donna |
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13 */ |
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14 |
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15 #include "tomcrypt.h" |
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16 |
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17 #ifdef LTC_POLY1305 |
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18 |
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19 /* internal only */ |
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20 static void _poly1305_block(poly1305_state *st, const unsigned char *in, unsigned long inlen) |
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21 { |
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22 const unsigned long hibit = (st->final) ? 0 : (1UL << 24); /* 1 << 128 */ |
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23 ulong32 r0,r1,r2,r3,r4; |
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24 ulong32 s1,s2,s3,s4; |
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25 ulong32 h0,h1,h2,h3,h4; |
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26 ulong32 tmp; |
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27 ulong64 d0,d1,d2,d3,d4; |
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28 ulong32 c; |
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29 |
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30 r0 = st->r[0]; |
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31 r1 = st->r[1]; |
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32 r2 = st->r[2]; |
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33 r3 = st->r[3]; |
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34 r4 = st->r[4]; |
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35 |
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36 s1 = r1 * 5; |
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37 s2 = r2 * 5; |
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38 s3 = r3 * 5; |
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39 s4 = r4 * 5; |
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40 |
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41 h0 = st->h[0]; |
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42 h1 = st->h[1]; |
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43 h2 = st->h[2]; |
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44 h3 = st->h[3]; |
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45 h4 = st->h[4]; |
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46 |
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47 while (inlen >= 16) { |
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48 /* h += in[i] */ |
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49 LOAD32L(tmp, in+ 0); h0 += (tmp ) & 0x3ffffff; |
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50 LOAD32L(tmp, in+ 3); h1 += (tmp >> 2) & 0x3ffffff; |
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51 LOAD32L(tmp, in+ 6); h2 += (tmp >> 4) & 0x3ffffff; |
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52 LOAD32L(tmp, in+ 9); h3 += (tmp >> 6) & 0x3ffffff; |
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53 LOAD32L(tmp, in+12); h4 += (tmp >> 8) | hibit; |
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54 |
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55 /* h *= r */ |
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56 d0 = ((ulong64)h0 * r0) + ((ulong64)h1 * s4) + ((ulong64)h2 * s3) + ((ulong64)h3 * s2) + ((ulong64)h4 * s1); |
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57 d1 = ((ulong64)h0 * r1) + ((ulong64)h1 * r0) + ((ulong64)h2 * s4) + ((ulong64)h3 * s3) + ((ulong64)h4 * s2); |
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58 d2 = ((ulong64)h0 * r2) + ((ulong64)h1 * r1) + ((ulong64)h2 * r0) + ((ulong64)h3 * s4) + ((ulong64)h4 * s3); |
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59 d3 = ((ulong64)h0 * r3) + ((ulong64)h1 * r2) + ((ulong64)h2 * r1) + ((ulong64)h3 * r0) + ((ulong64)h4 * s4); |
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60 d4 = ((ulong64)h0 * r4) + ((ulong64)h1 * r3) + ((ulong64)h2 * r2) + ((ulong64)h3 * r1) + ((ulong64)h4 * r0); |
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61 |
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62 /* (partial) h %= p */ |
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63 c = (ulong32)(d0 >> 26); h0 = (ulong32)d0 & 0x3ffffff; |
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64 d1 += c; c = (ulong32)(d1 >> 26); h1 = (ulong32)d1 & 0x3ffffff; |
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65 d2 += c; c = (ulong32)(d2 >> 26); h2 = (ulong32)d2 & 0x3ffffff; |
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66 d3 += c; c = (ulong32)(d3 >> 26); h3 = (ulong32)d3 & 0x3ffffff; |
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67 d4 += c; c = (ulong32)(d4 >> 26); h4 = (ulong32)d4 & 0x3ffffff; |
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68 h0 += c * 5; c = (h0 >> 26); h0 = h0 & 0x3ffffff; |
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69 h1 += c; |
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70 |
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71 in += 16; |
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72 inlen -= 16; |
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73 } |
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74 |
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75 st->h[0] = h0; |
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76 st->h[1] = h1; |
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77 st->h[2] = h2; |
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78 st->h[3] = h3; |
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79 st->h[4] = h4; |
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80 } |
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81 |
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82 /** |
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83 Initialize an POLY1305 context. |
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84 @param st The POLY1305 state |
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85 @param key The secret key |
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86 @param keylen The length of the secret key (octets) |
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87 @return CRYPT_OK if successful |
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88 */ |
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89 int poly1305_init(poly1305_state *st, const unsigned char *key, unsigned long keylen) |
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90 { |
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91 LTC_ARGCHK(st != NULL); |
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92 LTC_ARGCHK(key != NULL); |
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93 LTC_ARGCHK(keylen == 32); |
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94 |
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95 /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */ |
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96 LOAD32L(st->r[0], key + 0); st->r[0] = (st->r[0] ) & 0x3ffffff; |
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97 LOAD32L(st->r[1], key + 3); st->r[1] = (st->r[1] >> 2) & 0x3ffff03; |
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98 LOAD32L(st->r[2], key + 6); st->r[2] = (st->r[2] >> 4) & 0x3ffc0ff; |
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99 LOAD32L(st->r[3], key + 9); st->r[3] = (st->r[3] >> 6) & 0x3f03fff; |
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100 LOAD32L(st->r[4], key + 12); st->r[4] = (st->r[4] >> 8) & 0x00fffff; |
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101 |
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102 /* h = 0 */ |
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103 st->h[0] = 0; |
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104 st->h[1] = 0; |
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105 st->h[2] = 0; |
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106 st->h[3] = 0; |
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107 st->h[4] = 0; |
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108 |
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109 /* save pad for later */ |
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110 LOAD32L(st->pad[0], key + 16); |
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111 LOAD32L(st->pad[1], key + 20); |
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112 LOAD32L(st->pad[2], key + 24); |
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113 LOAD32L(st->pad[3], key + 28); |
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114 |
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115 st->leftover = 0; |
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116 st->final = 0; |
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117 return CRYPT_OK; |
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118 } |
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119 |
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120 /** |
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121 Process data through POLY1305 |
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122 @param st The POLY1305 state |
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123 @param in The data to send through HMAC |
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124 @param inlen The length of the data to HMAC (octets) |
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125 @return CRYPT_OK if successful |
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126 */ |
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127 int poly1305_process(poly1305_state *st, const unsigned char *in, unsigned long inlen) |
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128 { |
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129 unsigned long i; |
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130 |
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131 if (inlen == 0) return CRYPT_OK; /* nothing to do */ |
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132 LTC_ARGCHK(st != NULL); |
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133 LTC_ARGCHK(in != NULL); |
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134 |
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135 /* handle leftover */ |
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136 if (st->leftover) { |
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137 unsigned long want = (16 - st->leftover); |
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138 if (want > inlen) want = inlen; |
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139 for (i = 0; i < want; i++) st->buffer[st->leftover + i] = in[i]; |
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140 inlen -= want; |
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141 in += want; |
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142 st->leftover += want; |
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143 if (st->leftover < 16) return CRYPT_OK; |
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144 _poly1305_block(st, st->buffer, 16); |
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145 st->leftover = 0; |
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146 } |
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147 |
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148 /* process full blocks */ |
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149 if (inlen >= 16) { |
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150 unsigned long want = (inlen & ~(16 - 1)); |
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151 _poly1305_block(st, in, want); |
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152 in += want; |
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153 inlen -= want; |
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154 } |
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155 |
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156 /* store leftover */ |
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157 if (inlen) { |
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158 for (i = 0; i < inlen; i++) st->buffer[st->leftover + i] = in[i]; |
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159 st->leftover += inlen; |
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160 } |
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161 return CRYPT_OK; |
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162 } |
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163 |
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164 /** |
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165 Terminate a POLY1305 session |
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166 @param st The POLY1305 state |
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167 @param mac [out] The destination of the POLY1305 authentication tag |
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168 @param maclen [in/out] The max size and resulting size of the POLY1305 authentication tag |
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169 @return CRYPT_OK if successful |
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170 */ |
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171 int poly1305_done(poly1305_state *st, unsigned char *mac, unsigned long *maclen) |
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172 { |
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173 ulong32 h0,h1,h2,h3,h4,c; |
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174 ulong32 g0,g1,g2,g3,g4; |
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175 ulong64 f; |
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176 ulong32 mask; |
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177 |
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178 LTC_ARGCHK(st != NULL); |
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179 LTC_ARGCHK(mac != NULL); |
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180 LTC_ARGCHK(maclen != NULL); |
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181 LTC_ARGCHK(*maclen >= 16); |
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182 |
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183 /* process the remaining block */ |
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184 if (st->leftover) { |
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185 unsigned long i = st->leftover; |
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186 st->buffer[i++] = 1; |
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187 for (; i < 16; i++) st->buffer[i] = 0; |
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188 st->final = 1; |
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189 _poly1305_block(st, st->buffer, 16); |
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190 } |
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191 |
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192 /* fully carry h */ |
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193 h0 = st->h[0]; |
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194 h1 = st->h[1]; |
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195 h2 = st->h[2]; |
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196 h3 = st->h[3]; |
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197 h4 = st->h[4]; |
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198 |
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199 c = h1 >> 26; h1 = h1 & 0x3ffffff; |
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200 h2 += c; c = h2 >> 26; h2 = h2 & 0x3ffffff; |
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201 h3 += c; c = h3 >> 26; h3 = h3 & 0x3ffffff; |
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202 h4 += c; c = h4 >> 26; h4 = h4 & 0x3ffffff; |
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203 h0 += c * 5; c = h0 >> 26; h0 = h0 & 0x3ffffff; |
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204 h1 += c; |
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205 |
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206 /* compute h + -p */ |
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207 g0 = h0 + 5; c = g0 >> 26; g0 &= 0x3ffffff; |
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208 g1 = h1 + c; c = g1 >> 26; g1 &= 0x3ffffff; |
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209 g2 = h2 + c; c = g2 >> 26; g2 &= 0x3ffffff; |
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210 g3 = h3 + c; c = g3 >> 26; g3 &= 0x3ffffff; |
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211 g4 = h4 + c - (1UL << 26); |
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212 |
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213 /* select h if h < p, or h + -p if h >= p */ |
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214 mask = (g4 >> 31) - 1; |
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215 g0 &= mask; |
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216 g1 &= mask; |
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217 g2 &= mask; |
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218 g3 &= mask; |
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219 g4 &= mask; |
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220 mask = ~mask; |
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221 h0 = (h0 & mask) | g0; |
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222 h1 = (h1 & mask) | g1; |
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223 h2 = (h2 & mask) | g2; |
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224 h3 = (h3 & mask) | g3; |
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225 h4 = (h4 & mask) | g4; |
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226 |
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227 /* h = h % (2^128) */ |
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228 h0 = ((h0 ) | (h1 << 26)) & 0xffffffff; |
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229 h1 = ((h1 >> 6) | (h2 << 20)) & 0xffffffff; |
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230 h2 = ((h2 >> 12) | (h3 << 14)) & 0xffffffff; |
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231 h3 = ((h3 >> 18) | (h4 << 8)) & 0xffffffff; |
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232 |
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233 /* mac = (h + pad) % (2^128) */ |
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234 f = (ulong64)h0 + st->pad[0] ; h0 = (ulong32)f; |
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235 f = (ulong64)h1 + st->pad[1] + (f >> 32); h1 = (ulong32)f; |
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236 f = (ulong64)h2 + st->pad[2] + (f >> 32); h2 = (ulong32)f; |
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237 f = (ulong64)h3 + st->pad[3] + (f >> 32); h3 = (ulong32)f; |
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238 |
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239 STORE32L(h0, mac + 0); |
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240 STORE32L(h1, mac + 4); |
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241 STORE32L(h2, mac + 8); |
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242 STORE32L(h3, mac + 12); |
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243 |
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244 /* zero out the state */ |
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245 st->h[0] = 0; |
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246 st->h[1] = 0; |
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247 st->h[2] = 0; |
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248 st->h[3] = 0; |
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249 st->h[4] = 0; |
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250 st->r[0] = 0; |
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251 st->r[1] = 0; |
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252 st->r[2] = 0; |
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253 st->r[3] = 0; |
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254 st->r[4] = 0; |
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255 st->pad[0] = 0; |
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256 st->pad[1] = 0; |
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257 st->pad[2] = 0; |
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258 st->pad[3] = 0; |
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259 |
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260 *maclen = 16; |
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261 return CRYPT_OK; |
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262 } |
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263 |
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264 #endif |
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265 |
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266 /* ref: $Format:%D$ */ |
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267 /* git commit: $Format:%H$ */ |
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268 /* commit time: $Format:%ai$ */ |