Mercurial > dropbear

annotate libtomcrypt/src/stream/sober128/sober128_stream.c @ 1715:3974f087d9c0

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Disallow leading lines before the ident for server (#102) Per RFC4253 4.2 clients must be able to process other lines of data before the version string, server behavior is not defined neither with MUST/SHOULD nor with MAY. If server process up to 50 lines too - it may cause too long hanging session with invalid/evil client that consume host resources and potentially may lead to DDoS on poor embedded boxes. Let's require first line from client to be version string and fail early if it's not - matches both RFC and real OpenSSH behavior.
author Vladislav Grishenko <themiron@users.noreply.github.com>
date Mon, 15 Jun 2020 18:22:18 +0500
parents 6dba84798cd5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 sober128_stream.c
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13 Implementation of SOBER-128 by Tom St Denis.
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14 Based on s128fast.c reference code supplied by Greg Rose of QUALCOMM.
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15 */
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16
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17 #ifdef LTC_SOBER128
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18
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19 #define __LTC_SOBER128TAB_C__
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20 #include "sober128tab.c"
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21
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22 /* don't change these... */
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23 #define N 17
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24 #define FOLD N /* how many iterations of folding to do */
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25 #define INITKONST 0x6996c53a /* value of KONST to use during key loading */
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26 #define KEYP 15 /* where to insert key words */
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27 #define FOLDP 4 /* where to insert non-linear feedback */
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28
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29 #define B(x,i) ((unsigned char)(((x) >> (8*i)) & 0xFF))
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30
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31 static ulong32 BYTE2WORD(unsigned char *b)
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32 {
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33 ulong32 t;
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34 LOAD32L(t, b);
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35 return t;
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36 }
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37
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38 static void XORWORD(ulong32 w, const unsigned char *in, unsigned char *out)
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39 {
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40 ulong32 t;
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41 LOAD32L(t, in);
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42 t ^= w;
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43 STORE32L(t, out);
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44 }
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45
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46 /* give correct offset for the current position of the register,
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47 * where logically R[0] is at position "zero".
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48 */
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49 #define OFF(zero, i) (((zero)+(i)) % N)
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50
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51 /* step the LFSR */
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52 /* After stepping, "zero" moves right one place */
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53 #define STEP(R,z) \
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54 R[OFF(z,0)] = R[OFF(z,15)] ^ R[OFF(z,4)] ^ (R[OFF(z,0)] << 8) ^ Multab[(R[OFF(z,0)] >> 24) & 0xFF];
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55
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56 static void cycle(ulong32 *R)
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57 {
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58 ulong32 t;
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59 int i;
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60
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61 STEP(R,0);
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62 t = R[0];
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63 for (i = 1; i < N; ++i) {
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64 R[i-1] = R[i];
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65 }
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66 R[N-1] = t;
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67 }
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68
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69 /* Return a non-linear function of some parts of the register.
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70 */
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71 #define NLFUNC(c,z) \
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72 { \
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73 t = c->R[OFF(z,0)] + c->R[OFF(z,16)]; \
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74 t ^= Sbox[(t >> 24) & 0xFF]; \
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75 t = RORc(t, 8); \
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76 t = ((t + c->R[OFF(z,1)]) ^ c->konst) + c->R[OFF(z,6)]; \
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77 t ^= Sbox[(t >> 24) & 0xFF]; \
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78 t = t + c->R[OFF(z,13)]; \
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79 }
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80
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81 static ulong32 nltap(sober128_state *c)
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82 {
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83 ulong32 t;
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84 NLFUNC(c, 0);
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85 return t;
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86 }
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87
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88 /* Save the current register state
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89 */
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90 static void s128_savestate(sober128_state *c)
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91 {
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92 int i;
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93 for (i = 0; i < N; ++i) {
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94 c->initR[i] = c->R[i];
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95 }
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96 }
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97
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98 /* initialise to previously saved register state
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99 */
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100 static void s128_reloadstate(sober128_state *c)
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101 {
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102 int i;
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103
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104 for (i = 0; i < N; ++i) {
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105 c->R[i] = c->initR[i];
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106 }
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107 }
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108
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109 /* Initialise "konst"
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110 */
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111 static void s128_genkonst(sober128_state *c)
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112 {
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113 ulong32 newkonst;
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114
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115 do {
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116 cycle(c->R);
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117 newkonst = nltap(c);
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118 } while ((newkonst & 0xFF000000) == 0);
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119 c->konst = newkonst;
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120 }
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121
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122 /* Load key material into the register
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123 */
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124 #define ADDKEY(k) \
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125 c->R[KEYP] += (k);
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126
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127 #define XORNL(nl) \
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128 c->R[FOLDP] ^= (nl);
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129
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130 /* nonlinear diffusion of register for key */
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131 #define DROUND(z) STEP(c->R,z); NLFUNC(c,(z+1)); c->R[OFF((z+1),FOLDP)] ^= t;
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132 static void s128_diffuse(sober128_state *c)
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133 {
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diff changeset
134 ulong32 t;
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diff changeset
135 /* relies on FOLD == N == 17! */
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diff changeset
136 DROUND(0);
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diff changeset
137 DROUND(1);
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diff changeset
138 DROUND(2);
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diff changeset
139 DROUND(3);
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diff changeset
140 DROUND(4);
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parents:
diff changeset
141 DROUND(5);
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diff changeset
142 DROUND(6);
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diff changeset
143 DROUND(7);
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diff changeset
144 DROUND(8);
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parents:
diff changeset
145 DROUND(9);
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parents:
diff changeset
146 DROUND(10);
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diff changeset
147 DROUND(11);
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diff changeset
148 DROUND(12);
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parents:
diff changeset
149 DROUND(13);
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diff changeset
150 DROUND(14);
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parents:
diff changeset
151 DROUND(15);
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diff changeset
152 DROUND(16);
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153 }
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diff changeset
154
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
155 /**
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
156 Initialize an Sober128 context (only the key)
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diff changeset
157 @param c [out] The destination of the Sober128 state
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diff changeset
158 @param key The secret key
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diff changeset
159 @param keylen The length of the secret key (octets)
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diff changeset
160 @return CRYPT_OK if successful
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diff changeset
161 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
162 int sober128_stream_setup(sober128_state *c, const unsigned char *key, unsigned long keylen)
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diff changeset
163 {
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diff changeset
164 ulong32 i, k;
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diff changeset
165
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166 LTC_ARGCHK(c != NULL);
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diff changeset
167 LTC_ARGCHK(key != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
168 LTC_ARGCHK(keylen > 0);
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diff changeset
169
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diff changeset
170 /* keylen must be multiple of 4 bytes */
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parents:
diff changeset
171 if ((keylen & 3) != 0) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
172 return CRYPT_INVALID_KEYSIZE;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
173 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
174
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
175 /* Register initialised to Fibonacci numbers */
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
176 c->R[0] = 1;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
177 c->R[1] = 1;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
178 for (i = 2; i < N; ++i) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
179 c->R[i] = c->R[i-1] + c->R[i-2];
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
180 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
181 c->konst = INITKONST;
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
182
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diff changeset
183 for (i = 0; i < keylen; i += 4) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
184 k = BYTE2WORD((unsigned char *)&key[i]);
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
185 ADDKEY(k);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
186 cycle(c->R);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
187 XORNL(nltap(c));
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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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
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
190 /* also fold in the length of the key */
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diff changeset
191 ADDKEY(keylen);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
192
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
193 /* now diffuse */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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diff changeset
194 s128_diffuse(c);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
195 s128_genkonst(c);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
196 s128_savestate(c);
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diff changeset
197 c->nbuf = 0;
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diff changeset
198
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diff changeset
199 return CRYPT_OK;
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diff changeset
200 }
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diff changeset
201
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
202 /**
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
203 Set IV to the Sober128 state
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
204 @param c The Sober12820 state
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Matt Johnston <matt@ucc.asn.au>
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diff changeset
205 @param iv The IV data to add
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
206 @param ivlen The length of the IV (must be 12)
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diff changeset
207 @return CRYPT_OK on success
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
208 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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diff changeset
209 int sober128_stream_setiv(sober128_state *c, const unsigned char *iv, unsigned long ivlen)
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parents:
diff changeset
210 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
211 ulong32 i, k;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
212
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
213 LTC_ARGCHK(c != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
214 LTC_ARGCHK(iv != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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parents:
diff changeset
215 LTC_ARGCHK(ivlen > 0);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
216
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
217 /* ok we are adding an IV then... */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
218 s128_reloadstate(c);
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
219
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
220 /* ivlen must be multiple of 4 bytes */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 if ((ivlen & 3) != 0) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 return CRYPT_INVALID_KEYSIZE;
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 for (i = 0; i < ivlen; i += 4) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
226 k = BYTE2WORD((unsigned char *)&iv[i]);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
227 ADDKEY(k);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
228 cycle(c->R);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
229 XORNL(nltap(c));
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 /* also fold in the length of the key */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
233 ADDKEY(ivlen);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
234
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
235 /* now diffuse */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
236 s128_diffuse(c);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
237 c->nbuf = 0;
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 return CRYPT_OK;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
241
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 /* XOR pseudo-random bytes into buffer
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
244 #define SROUND(z) STEP(c->R,z); NLFUNC(c,(z+1)); XORWORD(t, in+(z*4), out+(z*4));
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parents:
diff changeset
245
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 Encrypt (or decrypt) bytes of ciphertext (or plaintext) with Sober128
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
248 @param c The Sober128 state
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
249 @param in The plaintext (or ciphertext)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
250 @param inlen The length of the input (octets)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
251 @param out [out] The ciphertext (or plaintext), length inlen
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
252 @return CRYPT_OK if successful
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 int sober128_stream_crypt(sober128_state *c, const unsigned char *in, unsigned long inlen, unsigned char *out)
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
255 {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
256 ulong32 t;
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 (inlen == 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(out != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
260 LTC_ARGCHK(c != NULL);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
261
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
262 /* handle any previously buffered bytes */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
263 while (c->nbuf != 0 && inlen != 0) {
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
264 *out++ = *in++ ^ (unsigned char)(c->sbuf & 0xFF);
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
265 c->sbuf >>= 8;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
266 c->nbuf -= 8;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
267 --inlen;
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
268 }
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
269
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
270 #ifndef LTC_SMALL_CODE
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
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271 /* do lots at a time, if there's enough to do */
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272 while (inlen >= N*4) {
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273 SROUND(0);
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274 SROUND(1);
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275 SROUND(2);
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276 SROUND(3);
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277 SROUND(4);
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278 SROUND(5);
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279 SROUND(6);
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280 SROUND(7);
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281 SROUND(8);
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282 SROUND(9);
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283 SROUND(10);
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284 SROUND(11);
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285 SROUND(12);
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286 SROUND(13);
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287 SROUND(14);
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288 SROUND(15);
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289 SROUND(16);
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290 out += 4*N;
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291 in += 4*N;
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292 inlen -= 4*N;
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293 }
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294 #endif
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295
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296 /* do small or odd size buffers the slow way */
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297 while (4 <= inlen) {
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298 cycle(c->R);
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299 t = nltap(c);
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300 XORWORD(t, in, out);
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301 out += 4;
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302 in += 4;
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303 inlen -= 4;
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304 }
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305
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306 /* handle any trailing bytes */
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307 if (inlen != 0) {
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308 cycle(c->R);
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309 c->sbuf = nltap(c);
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310 c->nbuf = 32;
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311 while (c->nbuf != 0 && inlen != 0) {
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312 *out++ = *in++ ^ (unsigned char)(c->sbuf & 0xFF);
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313 c->sbuf >>= 8;
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314 c->nbuf -= 8;
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315 --inlen;
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316 }
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317 }
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318
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319 return CRYPT_OK;
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320 }
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321
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322 int sober128_stream_keystream(sober128_state *c, unsigned char *out, unsigned long outlen)
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323 {
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324 if (outlen == 0) return CRYPT_OK; /* nothing to do */
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325 LTC_ARGCHK(out != NULL);
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326 XMEMSET(out, 0, outlen);
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327 return sober128_stream_crypt(c, out, outlen, out);
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328 }
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329
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330 /**
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331 Terminate and clear Sober128 state
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332 @param c The Sober128 state
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333 @return CRYPT_OK on success
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334 */
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335 int sober128_stream_done(sober128_state *c)
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336 {
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337 LTC_ARGCHK(c != NULL);
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338 XMEMSET(c, 0, sizeof(sober128_state));
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339 return CRYPT_OK;
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340 }
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341
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342 #endif
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343
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344 /* ref: $Format:%D$ */
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345 /* git commit: $Format:%H$ */
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346 /* commit time: $Format:%ai$ */