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annotate libtomcrypt/src/mac/poly1305/poly1305.c @ 1745:a6824c54962a

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Merge fuzz branch
author Matt Johnston <matt@ucc.asn.au>
date Sun, 18 Oct 2020 22:53:44 +0800
parents 6dba84798cd5
children
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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];