Mercurial > dropbear

annotate libtomcrypt/src/misc/adler32.c @ 1672:3a97f14c0235

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Add Chacha20-Poly1305, AES128-GCM and AES256-GCM support (#93) * Add Chacha20-Poly1305 authenticated encryption * Add general AEAD approach. * Add [email protected] algo using LibTomCrypt chacha and poly1305 routines. Chacha20-Poly1305 is generally faster than AES256 on CPU w/o dedicated AES instructions, having the same key size. Compiling in will add ~5,5kB to binary size on x86-64. function old new delta chacha_crypt - 1397 +1397 _poly1305_block - 608 +608 poly1305_done - 595 +595 dropbear_chachapoly_crypt - 457 +457 .rodata 26976 27392 +416 poly1305_process - 290 +290 poly1305_init - 221 +221 chacha_setup - 218 +218 encrypt_packet 1068 1270 +202 dropbear_chachapoly_getlength - 147 +147 decrypt_packet 756 897 +141 chacha_ivctr64 - 137 +137 read_packet 543 637 +94 dropbear_chachapoly_start - 94 +94 read_kex_algos 792 880 +88 chacha_keystream - 69 +69 dropbear_mode_chachapoly - 48 +48 sshciphers 280 320 +40 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_chachapoly_mac - 24 +24 dropbear_chachapoly - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 5388/0) Total: 5388 bytes * Add AES128-GCM and AES256-GCM authenticated encryption * Add general AES-GCM mode. * Add [email protected] and [email protected] algo using LibTomCrypt gcm routines. AES-GCM is combination of AES CTR mode and GHASH, slower than AES-CTR on CPU w/o dedicated AES/GHASH instructions therefore disabled by default. Compiling in will add ~6kB to binary size on x86-64. function old new delta gcm_process - 1060 +1060 .rodata 26976 27808 +832 gcm_gf_mult - 820 +820 gcm_add_aad - 660 +660 gcm_shift_table - 512 +512 gcm_done - 471 +471 gcm_add_iv - 384 +384 gcm_init - 347 +347 dropbear_gcm_crypt - 309 +309 encrypt_packet 1068 1270 +202 decrypt_packet 756 897 +141 gcm_reset - 118 +118 read_packet 543 637 +94 read_kex_algos 792 880 +88 sshciphers 280 360 +80 gcm_mult_h - 80 +80 dropbear_gcm_start - 62 +62 dropbear_mode_gcm - 48 +48 dropbear_mode_none 24 48 +24 dropbear_mode_ctr 24 48 +24 dropbear_mode_cbc 24 48 +24 dropbear_ghash - 24 +24 dropbear_gcm_getlength - 24 +24 gen_new_keys 848 854 +6 ------------------------------------------------------------------------------ (add/remove: 14/0 grow/shrink: 10/0 up/down: 6434/0) Total: 6434 bytes
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 25 May 2020 20:50:25 +0500
parents 6dba84798cd5
children
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rev   line source
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 #include "tomcrypt.h"
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10
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11 /**
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12 @file adler32.c
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13 Adler-32 checksum algorithm
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14 Written and placed in the public domain by Wei Dai
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15 Adapted for libtomcrypt by Steffen Jaeckel
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16 */
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17 #ifdef LTC_ADLER32
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18
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19 static const unsigned long _adler32_base = 65521;
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20
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21 void adler32_init(adler32_state *ctx)
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22 {
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23 LTC_ARGCHKVD(ctx != NULL);
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24 ctx->s[0] = 1;
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25 ctx->s[1] = 0;
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26 }
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27
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28 void adler32_update(adler32_state *ctx, const unsigned char *input, unsigned long length)
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29 {
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30 unsigned long s1, s2;
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31
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32 LTC_ARGCHKVD(ctx != NULL);
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33 LTC_ARGCHKVD(input != NULL);
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34 s1 = ctx->s[0];
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35 s2 = ctx->s[1];
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36
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37 if (length % 8 != 0) {
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38 do {
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39 s1 += *input++;
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40 s2 += s1;
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41 length--;
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42 } while (length % 8 != 0);
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43
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44 if (s1 >= _adler32_base)
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45 s1 -= _adler32_base;
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46 s2 %= _adler32_base;
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47 }
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48
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49 while (length > 0) {
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50 s1 += input[0];
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51 s2 += s1;
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52 s1 += input[1];
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53 s2 += s1;
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54 s1 += input[2];
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55 s2 += s1;
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56 s1 += input[3];
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57 s2 += s1;
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58 s1 += input[4];
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59 s2 += s1;
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60 s1 += input[5];
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61 s2 += s1;
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62 s1 += input[6];
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63 s2 += s1;
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64 s1 += input[7];
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65 s2 += s1;
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66
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67 length -= 8;
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68 input += 8;
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69
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70 if (s1 >= _adler32_base)
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71 s1 -= _adler32_base;
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72 s2 %= _adler32_base;
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73 }
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74
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75 LTC_ARGCHKVD(s1 < _adler32_base);
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76 LTC_ARGCHKVD(s2 < _adler32_base);
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77
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78 ctx->s[0] = (unsigned short)s1;
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79 ctx->s[1] = (unsigned short)s2;
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80 }
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81
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82 void adler32_finish(adler32_state *ctx, void *hash, unsigned long size)
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83 {
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84 unsigned char* h;
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85
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86 LTC_ARGCHKVD(ctx != NULL);
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87 LTC_ARGCHKVD(hash != NULL);
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88
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89 h = hash;
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90
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91 switch (size) {
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92 default:
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93 h[3] = ctx->s[0] & 0x0ff;
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94 /* FALLTHROUGH */
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95 case 3:
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96 h[2] = (ctx->s[0] >> 8) & 0x0ff;
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97 /* FALLTHROUGH */
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98 case 2:
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99 h[1] = ctx->s[1] & 0x0ff;
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100 /* FALLTHROUGH */
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101 case 1:
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102 h[0] = (ctx->s[1] >> 8) & 0x0ff;
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103 /* FALLTHROUGH */
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104 case 0:
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105 ;
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106 }
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107 }
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108
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109 int adler32_test(void)
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110 {
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111 #ifndef LTC_TEST
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112 return CRYPT_NOP;
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113 #else
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114 const void* in = "libtomcrypt";
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115 const unsigned char adler32[] = { 0x1b, 0xe8, 0x04, 0xba };
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116 unsigned char out[4];
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117 adler32_state ctx;
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118 adler32_init(&ctx);
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119 adler32_update(&ctx, in, strlen(in));
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120 adler32_finish(&ctx, out, 4);
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121 if (compare_testvector(adler32, 4, out, 4, "adler32", 0)) {
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122 return CRYPT_FAIL_TESTVECTOR;
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123 }
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124 return CRYPT_OK;
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125 #endif
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126 }
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127 #endif
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128
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129 /* ref: $Format:%D$ */
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130 /* git commit: $Format:%H$ */
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131 /* commit time: $Format:%ai$ */