annotate gensignkey.c @ 1528:b9e4fd5a0e72 fuzz

compile fixes
author Matt Johnston <matt@ucc.asn.au>
date Wed, 21 Feb 2018 21:03:42 +0800
parents 4f8eb331174f
children 7402218141d4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
846
b298bb438625 refactor key generation, make it generate as required.
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diff changeset
1 #include "includes.h"
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2 #include "dbutil.h"
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3 #include "buffer.h"
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4 #include "ecdsa.h"
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5 #include "genrsa.h"
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6 #include "gendss.h"
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7 #include "signkey.h"
858
220f55d540ae rename random.h to dbrandom.h since some OSes have a system random.h
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parents: 857
diff changeset
8 #include "dbrandom.h"
846
b298bb438625 refactor key generation, make it generate as required.
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9
857
c19acba28590 use oldstyle comments
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10 /* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
846
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11 static int buf_writefile(buffer * buf, const char * filename) {
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12 int ret = DROPBEAR_FAILURE;
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13 int fd = -1;
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14
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15 fd = open(filename, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
b298bb438625 refactor key generation, make it generate as required.
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16 if (fd < 0) {
b298bb438625 refactor key generation, make it generate as required.
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17 dropbear_log(LOG_ERR, "Couldn't create new file %s: %s",
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18 filename, strerror(errno));
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19 goto out;
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20 }
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21
b298bb438625 refactor key generation, make it generate as required.
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22 /* write the file now */
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23 while (buf->pos != buf->len) {
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24 int len = write(fd, buf_getptr(buf, buf->len - buf->pos),
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25 buf->len - buf->pos);
888
6e6ae84d3dba Fix check for EINTR
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diff changeset
26 if (len == -1 && errno == EINTR) {
846
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27 continue;
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28 }
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29 if (len <= 0) {
b298bb438625 refactor key generation, make it generate as required.
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30 dropbear_log(LOG_ERR, "Failed writing file %s: %s",
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31 filename, strerror(errno));
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32 goto out;
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33 }
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34 buf_incrpos(buf, len);
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35 }
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36
b298bb438625 refactor key generation, make it generate as required.
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37 ret = DROPBEAR_SUCCESS;
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38
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39 out:
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40 if (fd >= 0) {
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2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails
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41 if (fsync(fd) != 0) {
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42 dropbear_log(LOG_ERR, "fsync of %s failed: %s", filename, strerror(errno));
2b62f26cf808 Open directories O_RDONLY for fsync, add debugging if it fails
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43 }
846
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44 m_close(fd);
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45 }
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46 return ret;
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47 }
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48
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49 /* returns 0 on failure */
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50 static int get_default_bits(enum signkey_type keytype)
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51 {
1250
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Francois Perrad <francois.perrad@gadz.org>
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52 switch (keytype) {
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750ec4ec4cbe Convert #ifdef to #if, other build changes
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53 #if DROPBEAR_RSA
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54 case DROPBEAR_SIGNKEY_RSA:
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55 return DROPBEAR_DEFAULT_RSA_SIZE;
846
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56 #endif
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57 #if DROPBEAR_DSS
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58 case DROPBEAR_SIGNKEY_DSS:
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59 /* DSS for SSH only defines 1024 bits */
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60 return 1024;
846
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61 #endif
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62 #if DROPBEAR_ECDSA
1250
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63 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
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64 return ECDSA_DEFAULT_SIZE;
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65 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
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66 return 521;
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67 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
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68 return 384;
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69 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
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70 return 256;
846
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71 #endif
1250
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72 default:
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73 return 0;
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74 }
846
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75 }
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76
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77 int signkey_generate_get_bits(enum signkey_type keytype, int bits) {
4f8eb331174f add configuration option for default RSA size.
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78 if (bits == 0)
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79 {
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80 bits = get_default_bits(keytype);
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81 }
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82 return bits;
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83 }
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84
1329
185c14fa504d Use atomic key generation in all cases
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85 /* if skip_exist is set it will silently return if the key file exists */
185c14fa504d Use atomic key generation in all cases
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86 int signkey_generate(enum signkey_type keytype, int bits, const char* filename, int skip_exist)
846
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87 {
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88 sign_key * key = NULL;
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89 buffer *buf = NULL;
1329
185c14fa504d Use atomic key generation in all cases
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90 char *fn_temp = NULL;
846
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91 int ret = DROPBEAR_FAILURE;
1438
4f8eb331174f add configuration option for default RSA size.
Matt Johnston <matt@ucc.asn.au>
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92 bits = signkey_generate_get_bits(keytype, bits);
846
b298bb438625 refactor key generation, make it generate as required.
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93
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94 /* now we can generate the key */
b298bb438625 refactor key generation, make it generate as required.
Matt Johnston <matt@ucc.asn.au>
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95 key = new_sign_key();
b298bb438625 refactor key generation, make it generate as required.
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96
852
7540c0822374 Various cleanups and fixes for warnings
Matt Johnston <matt@ucc.asn.au>
parents: 847
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97 seedrandom();
7540c0822374 Various cleanups and fixes for warnings
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diff changeset
98
846
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99 switch(keytype) {
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1250
diff changeset
100 #if DROPBEAR_RSA
846
b298bb438625 refactor key generation, make it generate as required.
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101 case DROPBEAR_SIGNKEY_RSA:
b298bb438625 refactor key generation, make it generate as required.
Matt Johnston <matt@ucc.asn.au>
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102 key->rsakey = gen_rsa_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required.
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parents:
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103 break;
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parents:
diff changeset
104 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1250
diff changeset
105 #if DROPBEAR_DSS
846
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106 case DROPBEAR_SIGNKEY_DSS:
b298bb438625 refactor key generation, make it generate as required.
Matt Johnston <matt@ucc.asn.au>
parents:
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107 key->dsskey = gen_dss_priv_key(bits);
b298bb438625 refactor key generation, make it generate as required.
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108 break;
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parents:
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109 #endif
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1250
diff changeset
110 #if DROPBEAR_ECDSA
846
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111 case DROPBEAR_SIGNKEY_ECDSA_KEYGEN:
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112 case DROPBEAR_SIGNKEY_ECDSA_NISTP521:
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parents:
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113 case DROPBEAR_SIGNKEY_ECDSA_NISTP384:
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parents:
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114 case DROPBEAR_SIGNKEY_ECDSA_NISTP256:
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parents:
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115 {
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116 ecc_key *ecckey = gen_ecdsa_priv_key(bits);
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117 keytype = ecdsa_signkey_type(ecckey);
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118 *signkey_key_ptr(key, keytype) = ecckey;
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119 }
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120 break;
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parents:
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121 #endif
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122 default:
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123 dropbear_exit("Internal error");
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124 }
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125
852
7540c0822374 Various cleanups and fixes for warnings
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parents: 847
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126 seedrandom();
7540c0822374 Various cleanups and fixes for warnings
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parents: 847
diff changeset
127
846
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128 buf = buf_new(MAX_PRIVKEY_SIZE);
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129
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130 buf_put_priv_key(buf, key, keytype);
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131 sign_key_free(key);
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132 key = NULL;
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133 buf_setpos(buf, 0);
1329
185c14fa504d Use atomic key generation in all cases
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134
185c14fa504d Use atomic key generation in all cases
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135 fn_temp = m_malloc(strlen(filename) + 30);
185c14fa504d Use atomic key generation in all cases
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parents: 1295
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136 snprintf(fn_temp, strlen(filename)+30, "%s.tmp%d", filename, getpid());
185c14fa504d Use atomic key generation in all cases
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parents: 1295
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137 ret = buf_writefile(buf, fn_temp);
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138
185c14fa504d Use atomic key generation in all cases
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parents: 1295
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139 if (ret == DROPBEAR_FAILURE) {
185c14fa504d Use atomic key generation in all cases
Matt Johnston <matt@ucc.asn.au>
parents: 1295
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140 goto out;
185c14fa504d Use atomic key generation in all cases
Matt Johnston <matt@ucc.asn.au>
parents: 1295
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141 }
846
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parents:
diff changeset
142
1329
185c14fa504d Use atomic key generation in all cases
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143 if (link(fn_temp, filename) < 0) {
185c14fa504d Use atomic key generation in all cases
Matt Johnston <matt@ucc.asn.au>
parents: 1295
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144 /* If generating keys on connection (skipexist) it's OK to get EEXIST
185c14fa504d Use atomic key generation in all cases
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parents: 1295
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145 - we probably just lost a race with another connection to generate the key */
185c14fa504d Use atomic key generation in all cases
Matt Johnston <matt@ucc.asn.au>
parents: 1295
diff changeset
146 if (!(skip_exist && errno == EEXIST)) {
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147 dropbear_log(LOG_ERR, "Failed moving key file to %s: %s", filename,
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148 strerror(errno));
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149 /* XXX fallback to non-atomic copy for some filesystems? */
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150 ret = DROPBEAR_FAILURE;
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151 goto out;
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152 }
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153 }
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154
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155 out:
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156 if (buf) {
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157 buf_burn(buf);
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158 buf_free(buf);
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159 }
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160
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161 if (fn_temp) {
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162 unlink(fn_temp);
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163 m_free(fn_temp);
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164 }
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165
846
b298bb438625 refactor key generation, make it generate as required.
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parents:
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166 return ret;
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parents:
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167 }