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annotate libtomcrypt/src/hashes/sha3.c @ 1674:ba6fc7afe1c5

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 06 Apr 2020 23:18:26 +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 /* 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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128 bc[i] = s[j + i];
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129 for(i = 0; i < 5; i++)
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parents:
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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parents:
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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parents:
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)
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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;
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diff changeset
161 }
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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 {
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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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parents:
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)
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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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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 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
183 unsigned old_tail = (8 - md->sha3.byte_index) & 7;
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diff changeset
184
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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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parents:
diff changeset
210
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parents:
diff changeset
211 /* now work in full words directly from input */
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Matt Johnston <matt@ucc.asn.au>
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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
Matt Johnston <matt@ucc.asn.au>
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
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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
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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 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
259 LTC_ARGCHK(md != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
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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: $Format:%ai$ */