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annotate libtomcrypt/src/hashes/sha2/sha512_256.c @ 1930:299f4f19ba19

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Add /usr/sbin and /sbin to default root PATH When dropbear is used in a very restricted environment (such as in a initrd), the default user shell is often also very restricted and doesn't take care of setting the PATH so the user ends up with the PATH set by dropbear. Unfortunately, dropbear always sets "/usr/bin:/bin" as default PATH even for the root user which should have /usr/sbin and /sbin too. For a concrete instance of this problem, see the "Remote Unlocking" section in this tutorial: https://paxswill.com/blog/2013/11/04/encrypted-raspberry-pi/ It speaks of a bug in the initramfs script because it's written "blkid" instead of "/sbin/blkid"... this is just because the scripts from the initramfs do not expect to have a PATH without the sbin directories and because dropbear is not setting the PATH appropriately for the root user. I'm thus suggesting to use the attached patch to fix this misbehaviour (I did not test it, but it's easy enough). It might seem anecdotic but multiple Kali users have been bitten by this. From https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
author Raphael Hertzog <hertzog@debian.org>
date Mon, 09 Jul 2018 16:27:53 +0200
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 /**
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10 @param sha512_256.c
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11 SHA512/256 hash included in sha512.c
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12 */
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13
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14 #include "tomcrypt.h"
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15
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16 #if defined(LTC_SHA512_256) && defined(LTC_SHA512)
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17
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18 const struct ltc_hash_descriptor sha512_256_desc =
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19 {
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20 "sha512-256",
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21 16,
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22 32,
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23 128,
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24
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25 /* OID */
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26 { 2, 16, 840, 1, 101, 3, 4, 2, 6, },
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27 9,
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28
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29 &sha512_256_init,
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30 &sha512_process,
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31 &sha512_256_done,
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32 &sha512_256_test,
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33 NULL
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34 };
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35
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36 /**
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37 Initialize the hash state
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38 @param md The hash state you wish to initialize
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39 @return CRYPT_OK if successful
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40 */
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41 int sha512_256_init(hash_state * md)
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42 {
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43 LTC_ARGCHK(md != NULL);
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44
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45 md->sha512.curlen = 0;
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46 md->sha512.length = 0;
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47 md->sha512.state[0] = CONST64(0x22312194FC2BF72C);
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48 md->sha512.state[1] = CONST64(0x9F555FA3C84C64C2);
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49 md->sha512.state[2] = CONST64(0x2393B86B6F53B151);
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50 md->sha512.state[3] = CONST64(0x963877195940EABD);
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51 md->sha512.state[4] = CONST64(0x96283EE2A88EFFE3);
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52 md->sha512.state[5] = CONST64(0xBE5E1E2553863992);
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53 md->sha512.state[6] = CONST64(0x2B0199FC2C85B8AA);
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54 md->sha512.state[7] = CONST64(0x0EB72DDC81C52CA2);
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55 return CRYPT_OK;
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56 }
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57
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58 /**
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59 Terminate the hash to get the digest
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60 @param md The hash state
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61 @param out [out] The destination of the hash (48 bytes)
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62 @return CRYPT_OK if successful
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63 */
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64 int sha512_256_done(hash_state * md, unsigned char *out)
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65 {
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66 unsigned char buf[64];
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67
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68 LTC_ARGCHK(md != NULL);
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69 LTC_ARGCHK(out != NULL);
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70
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71 if (md->sha512.curlen >= sizeof(md->sha512.buf)) {
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72 return CRYPT_INVALID_ARG;
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73 }
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74
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75 sha512_done(md, buf);
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76 XMEMCPY(out, buf, 32);
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77 #ifdef LTC_CLEAN_STACK
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78 zeromem(buf, sizeof(buf));
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79 #endif
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80 return CRYPT_OK;
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81 }
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82
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83 /**
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84 Self-test the hash
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85 @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled
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86 */
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87 int sha512_256_test(void)
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88 {
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89 #ifndef LTC_TEST
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90 return CRYPT_NOP;
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91 #else
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92 static const struct {
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93 const char *msg;
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94 unsigned char hash[32];
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95 } tests[] = {
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96 { "abc",
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97 { 0x53, 0x04, 0x8E, 0x26, 0x81, 0x94, 0x1E, 0xF9,
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98 0x9B, 0x2E, 0x29, 0xB7, 0x6B, 0x4C, 0x7D, 0xAB,
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99 0xE4, 0xC2, 0xD0, 0xC6, 0x34, 0xFC, 0x6D, 0x46,
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100 0xE0, 0xE2, 0xF1, 0x31, 0x07, 0xE7, 0xAF, 0x23 }
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101 },
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102 { "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu",
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103 { 0x39, 0x28, 0xE1, 0x84, 0xFB, 0x86, 0x90, 0xF8,
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104 0x40, 0xDA, 0x39, 0x88, 0x12, 0x1D, 0x31, 0xBE,
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105 0x65, 0xCB, 0x9D, 0x3E, 0xF8, 0x3E, 0xE6, 0x14,
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106 0x6F, 0xEA, 0xC8, 0x61, 0xE1, 0x9B, 0x56, 0x3A }
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107 },
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108 };
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109
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110 int i;
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111 unsigned char tmp[32];
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112 hash_state md;
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113
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114 for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
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115 sha512_256_init(&md);
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116 sha512_256_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg));
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117 sha512_256_done(&md, tmp);
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118 if (compare_testvector(tmp, sizeof(tmp), tests[i].hash, sizeof(tests[i].hash), "SHA512-265", i)) {
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119 return CRYPT_FAIL_TESTVECTOR;
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120 }
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121 }
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122 return CRYPT_OK;
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123 #endif
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124 }
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125
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126 #endif /* defined(LTC_SHA384) && defined(LTC_SHA512) */
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127
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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128 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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129 /* git commit: $Format:%H$ */
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130 /* commit time: $Format:%ai$ */