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annotate libtomcrypt/src/hashes/sha3.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 /* based on https://github.com/brainhub/SHA3IUF (public domain) */
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11
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12 #include "tomcrypt.h"
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13
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14 #ifdef LTC_SHA3
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15
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16 const struct ltc_hash_descriptor sha3_224_desc =
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17 {
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18 "sha3-224", /* name of hash */
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19 17, /* internal ID */
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20 28, /* Size of digest in octets */
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21 144, /* Input block size in octets */
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22 { 2,16,840,1,101,3,4,2,7 }, /* ASN.1 OID */
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23 9, /* Length OID */
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24 &sha3_224_init,
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25 &sha3_process,
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26 &sha3_done,
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27 &sha3_224_test,
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28 NULL
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29 };
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30
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31 const struct ltc_hash_descriptor sha3_256_desc =
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32 {
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33 "sha3-256", /* name of hash */
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34 18, /* internal ID */
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35 32, /* Size of digest in octets */
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36 136, /* Input block size in octets */
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37 { 2,16,840,1,101,3,4,2,8 }, /* ASN.1 OID */
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38 9, /* Length OID */
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39 &sha3_256_init,
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40 &sha3_process,
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41 &sha3_done,
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42 &sha3_256_test,
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43 NULL
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44 };
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45
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46 const struct ltc_hash_descriptor sha3_384_desc =
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47 {
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48 "sha3-384", /* name of hash */
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49 19, /* internal ID */
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50 48, /* Size of digest in octets */
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51 104, /* Input block size in octets */
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52 { 2,16,840,1,101,3,4,2,9 }, /* ASN.1 OID */
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53 9, /* Length OID */
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54 &sha3_384_init,
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55 &sha3_process,
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56 &sha3_done,
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57 &sha3_384_test,
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58 NULL
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59 };
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60
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61 const struct ltc_hash_descriptor sha3_512_desc =
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62 {
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63 "sha3-512", /* name of hash */
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64 20, /* internal ID */
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65 64, /* Size of digest in octets */
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66 72, /* Input block size in octets */
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67 { 2,16,840,1,101,3,4,2,10 }, /* ASN.1 OID */
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68 9, /* Length OID */
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69 &sha3_512_init,
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70 &sha3_process,
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71 &sha3_done,
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72 &sha3_512_test,
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73 NULL
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74 };
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75
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76 #define SHA3_KECCAK_SPONGE_WORDS 25 /* 1600 bits > 200 bytes > 25 x ulong64 */
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77 #define SHA3_KECCAK_ROUNDS 24
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78
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79 static const ulong64 keccakf_rndc[24] = {
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80 CONST64(0x0000000000000001), CONST64(0x0000000000008082),
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81 CONST64(0x800000000000808a), CONST64(0x8000000080008000),
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82 CONST64(0x000000000000808b), CONST64(0x0000000080000001),
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83 CONST64(0x8000000080008081), CONST64(0x8000000000008009),
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84 CONST64(0x000000000000008a), CONST64(0x0000000000000088),
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85 CONST64(0x0000000080008009), CONST64(0x000000008000000a),
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86 CONST64(0x000000008000808b), CONST64(0x800000000000008b),
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87 CONST64(0x8000000000008089), CONST64(0x8000000000008003),
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88 CONST64(0x8000000000008002), CONST64(0x8000000000000080),
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89 CONST64(0x000000000000800a), CONST64(0x800000008000000a),
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90 CONST64(0x8000000080008081), CONST64(0x8000000000008080),
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91 CONST64(0x0000000080000001), CONST64(0x8000000080008008)
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92 };
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93
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94 static const unsigned keccakf_rotc[24] = {
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95 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44
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96 };
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97
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98 static const unsigned keccakf_piln[24] = {
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99 10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4, 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1
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100 };
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101
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102 static void keccakf(ulong64 s[25])
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103 {
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104 int i, j, round;
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105 ulong64 t, bc[5];
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106
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107 for(round = 0; round < SHA3_KECCAK_ROUNDS; round++) {
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108 /* Theta */
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109 for(i = 0; i < 5; i++)
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110 bc[i] = s[i] ^ s[i + 5] ^ s[i + 10] ^ s[i + 15] ^ s[i + 20];
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111
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112 for(i = 0; i < 5; i++) {
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113 t = bc[(i + 4) % 5] ^ ROL64(bc[(i + 1) % 5], 1);
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114 for(j = 0; j < 25; j += 5)
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115 s[j + i] ^= t;
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116 }
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117 /* Rho Pi */
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118 t = s[1];
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119 for(i = 0; i < 24; i++) {
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120 j = keccakf_piln[i];
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121 bc[0] = s[j];
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122 s[j] = ROL64(t, keccakf_rotc[i]);
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123 t = bc[0];
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124 }
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125 /* Chi */
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126 for(j = 0; j < 25; j += 5) {
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127 for(i = 0; i < 5; i++)
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diff changeset
128 bc[i] = s[j + i];
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
129 for(i = 0; i < 5; i++)
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diff changeset
130 s[j + i] ^= (~bc[(i + 1) % 5]) & bc[(i + 2) % 5];
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
131 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
132 /* Iota */
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diff changeset
133 s[0] ^= keccakf_rndc[round];
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parents:
diff changeset
134 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
135 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
136
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
137 /* Public Inteface */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
138
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
139 int sha3_224_init(hash_state *md)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
140 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
141 LTC_ARGCHK(md != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
142 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
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diff changeset
143 md->sha3.capacity_words = 2 * 224 / (8 * sizeof(ulong64));
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diff changeset
144 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
145 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
146
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
147 int sha3_256_init(hash_state *md)
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diff changeset
148 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
149 LTC_ARGCHK(md != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
150 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
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diff changeset
151 md->sha3.capacity_words = 2 * 256 / (8 * sizeof(ulong64));
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diff changeset
152 return CRYPT_OK;
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diff changeset
153 }
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diff changeset
154
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
155 int sha3_384_init(hash_state *md)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
156 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
157 LTC_ARGCHK(md != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
158 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
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diff changeset
159 md->sha3.capacity_words = 2 * 384 / (8 * sizeof(ulong64));
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diff changeset
160 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
161 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
162
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
163 int sha3_512_init(hash_state *md)
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diff changeset
164 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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165 LTC_ARGCHK(md != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
166 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
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diff changeset
167 md->sha3.capacity_words = 2 * 512 / (8 * sizeof(ulong64));
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diff changeset
168 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
169 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
170
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
171 int sha3_shake_init(hash_state *md, int num)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
172 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
173 LTC_ARGCHK(md != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
174 if (num != 128 && num != 256) return CRYPT_INVALID_ARG;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
175 XMEMSET(&md->sha3, 0, sizeof(md->sha3));
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
176 md->sha3.capacity_words = (unsigned short)(2 * num / (8 * sizeof(ulong64)));
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
177 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
178 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
179
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
180 int sha3_process(hash_state *md, const unsigned char *in, unsigned long inlen)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
181 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
182 /* 0...7 -- how much is needed to have a word */
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diff changeset
183 unsigned old_tail = (8 - md->sha3.byte_index) & 7;
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diff changeset
184
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diff changeset
185 unsigned long words;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
186 unsigned tail;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
187 unsigned long i;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
188
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
189 if (inlen == 0) return CRYPT_OK; /* nothing to do */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
190 LTC_ARGCHK(md != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
191 LTC_ARGCHK(in != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
192
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diff changeset
193 if(inlen < old_tail) { /* have no complete word or haven't started the word yet */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
194 while (inlen--) md->sha3.saved |= (ulong64) (*(in++)) << ((md->sha3.byte_index++) * 8);
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diff changeset
195 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
196 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
197
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
198 if(old_tail) { /* will have one word to process */
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diff changeset
199 inlen -= old_tail;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
200 while (old_tail--) md->sha3.saved |= (ulong64) (*(in++)) << ((md->sha3.byte_index++) * 8);
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parents:
diff changeset
201 /* now ready to add saved to the sponge */
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diff changeset
202 md->sha3.s[md->sha3.word_index] ^= md->sha3.saved;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
203 md->sha3.byte_index = 0;
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diff changeset
204 md->sha3.saved = 0;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
205 if(++md->sha3.word_index == (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words)) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
206 keccakf(md->sha3.s);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
207 md->sha3.word_index = 0;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
208 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
209 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
210
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 /* now work in full words directly from input */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212 words = inlen / sizeof(ulong64);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
213 tail = inlen - words * sizeof(ulong64);
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parents:
diff changeset
214
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
215 for(i = 0; i < words; i++, in += sizeof(ulong64)) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216 ulong64 t;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 LOAD64L(t, in);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 md->sha3.s[md->sha3.word_index] ^= t;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
219 if(++md->sha3.word_index == (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words)) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 keccakf(md->sha3.s);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 md->sha3.word_index = 0;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
223 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
224
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 /* finally, save the partial word */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 while (tail--) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 md->sha3.saved |= (ulong64) (*(in++)) << ((md->sha3.byte_index++) * 8);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
230 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 int sha3_done(hash_state *md, unsigned char *hash)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234 unsigned i;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 LTC_ARGCHK(md != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 LTC_ARGCHK(hash != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
239 md->sha3.s[md->sha3.word_index] ^= (md->sha3.saved ^ (CONST64(0x06) << (md->sha3.byte_index * 8)));
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 md->sha3.s[SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words - 1] ^= CONST64(0x8000000000000000);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241 keccakf(md->sha3.s);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 /* store sha3.s[] as little-endian bytes into sha3.sb */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
245 STORE64L(md->sha3.s[i], md->sha3.sb + i * 8);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
246 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
247
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 XMEMCPY(hash, md->sha3.sb, md->sha3.capacity_words * 4);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 int sha3_shake_done(hash_state *md, unsigned char *out, unsigned long outlen)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
253 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
254 /* IMPORTANT NOTE: sha3_shake_done can be called many times */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 unsigned long idx;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 unsigned i;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
257
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
258 if (outlen == 0) return CRYPT_OK; /* nothing to do */
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259 LTC_ARGCHK(md != NULL);
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260 LTC_ARGCHK(out != NULL);
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261
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262 if (!md->sha3.xof_flag) {
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263 /* shake_xof operation must be done only once */
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264 md->sha3.s[md->sha3.word_index] ^= (md->sha3.saved ^ (CONST64(0x1F) << (md->sha3.byte_index * 8)));
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265 md->sha3.s[SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words - 1] ^= CONST64(0x8000000000000000);
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266 keccakf(md->sha3.s);
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267 /* store sha3.s[] as little-endian bytes into sha3.sb */
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268 for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) {
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269 STORE64L(md->sha3.s[i], md->sha3.sb + i * 8);
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270 }
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271 md->sha3.byte_index = 0;
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272 md->sha3.xof_flag = 1;
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273 }
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274
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275 for (idx = 0; idx < outlen; idx++) {
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276 if(md->sha3.byte_index >= (SHA3_KECCAK_SPONGE_WORDS - md->sha3.capacity_words) * 8) {
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277 keccakf(md->sha3.s);
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278 /* store sha3.s[] as little-endian bytes into sha3.sb */
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279 for(i = 0; i < SHA3_KECCAK_SPONGE_WORDS; i++) {
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280 STORE64L(md->sha3.s[i], md->sha3.sb + i * 8);
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281 }
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282 md->sha3.byte_index = 0;
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283 }
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284 out[idx] = md->sha3.sb[md->sha3.byte_index++];
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285 }
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286 return CRYPT_OK;
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287 }
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288
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289 int sha3_shake_memory(int num, const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen)
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290 {
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291 hash_state md;
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292 int err;
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293 LTC_ARGCHK(in != NULL);
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294 LTC_ARGCHK(out != NULL);
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295 LTC_ARGCHK(outlen != NULL);
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296 if ((err = sha3_shake_init(&md, num)) != CRYPT_OK) return err;
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297 if ((err = sha3_shake_process(&md, in, inlen)) != CRYPT_OK) return err;
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298 if ((err = sha3_shake_done(&md, out, *outlen)) != CRYPT_OK) return err;
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299 return CRYPT_OK;
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300 }
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301
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302 #endif
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303
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304 /* ref: $Format:%D$ */
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305 /* git commit: $Format:%H$ */
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306 /* commit time: $Format:%ai$ */