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1 | #include <string.h> |
2 | |
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3 | #include "puttymem.h" |
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4 | #include "network.h" |
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5 | |
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6 | /* |
7 | * Useful thing. |
8 | */ |
9 | #ifndef lenof |
10 | #define lenof(x) ( (sizeof((x))) / (sizeof(*(x)))) |
11 | #endif |
12 | |
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13 | #define SSH_CIPHER_IDEA 1 |
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14 | #define SSH_CIPHER_DES 2 |
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15 | #define SSH_CIPHER_3DES 3 |
16 | #define SSH_CIPHER_BLOWFISH 6 |
17 | |
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18 | #ifdef MSCRYPTOAPI |
19 | #define APIEXTRA 8 |
20 | #else |
21 | #define APIEXTRA 0 |
22 | #endif |
23 | |
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24 | #ifndef BIGNUM_INTERNAL |
25 | typedef void *Bignum; |
26 | #endif |
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27 | |
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28 | struct RSAKey { |
29 | int bits; |
30 | int bytes; |
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31 | #ifdef MSCRYPTOAPI |
32 | unsigned long exponent; |
33 | unsigned char *modulus; |
34 | #else |
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35 | Bignum modulus; |
36 | Bignum exponent; |
37 | Bignum private_exponent; |
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38 | Bignum p; |
39 | Bignum q; |
40 | Bignum iqmp; |
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41 | #endif |
42 | char *comment; |
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43 | }; |
44 | |
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45 | int makekey(unsigned char *data, struct RSAKey *result, |
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46 | unsigned char **keystr, int order); |
47 | int makeprivate(unsigned char *data, struct RSAKey *result); |
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48 | void rsaencrypt(unsigned char *data, int length, struct RSAKey *key); |
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49 | Bignum rsadecrypt(Bignum input, struct RSAKey *key); |
50 | void rsasign(unsigned char *data, int length, struct RSAKey *key); |
51 | void rsasanitise(struct RSAKey *key); |
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52 | int rsastr_len(struct RSAKey *key); |
53 | void rsastr_fmt(char *str, struct RSAKey *key); |
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54 | void rsa_fingerprint(char *str, int len, struct RSAKey *key); |
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55 | int rsa_verify(struct RSAKey *key); |
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56 | void freersakey(struct RSAKey *key); |
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57 | |
58 | typedef unsigned int word32; |
59 | typedef unsigned int uint32; |
60 | |
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61 | unsigned long crc32(const void *s, size_t len); |
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62 | |
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63 | typedef struct { |
64 | uint32 h[4]; |
65 | } MD5_Core_State; |
66 | |
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67 | struct MD5Context { |
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68 | #ifdef MSCRYPTOAPI |
69 | unsigned long hHash; |
70 | #else |
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71 | MD5_Core_State core; |
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72 | unsigned char block[64]; |
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73 | int blkused; |
74 | uint32 lenhi, lenlo; |
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75 | #endif |
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76 | }; |
77 | |
78 | void MD5Init(struct MD5Context *context); |
79 | void MD5Update(struct MD5Context *context, unsigned char const *buf, |
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80 | unsigned len); |
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81 | void MD5Final(unsigned char digest[16], struct MD5Context *context); |
82 | |
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83 | typedef struct { |
84 | uint32 h[5]; |
85 | unsigned char block[64]; |
86 | int blkused; |
87 | uint32 lenhi, lenlo; |
88 | } SHA_State; |
89 | |
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90 | void SHA_Init(SHA_State * s); |
91 | void SHA_Bytes(SHA_State * s, void *p, int len); |
92 | void SHA_Final(SHA_State * s, unsigned char *output); |
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93 | void SHA_Simple(void *p, int len, unsigned char *output); |
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94 | |
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95 | struct ssh_cipher { |
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96 | void (*sesskey) (unsigned char *key); /* for ssh 1 */ |
97 | void (*encrypt) (unsigned char *blk, int len); |
98 | void (*decrypt) (unsigned char *blk, int len); |
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99 | int blksize; |
100 | }; |
101 | |
102 | struct ssh2_cipher { |
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103 | void (*setcsiv) (unsigned char *key); /* for ssh 2 */ |
104 | void (*setcskey) (unsigned char *key); /* for ssh 2 */ |
105 | void (*setsciv) (unsigned char *key); /* for ssh 2 */ |
106 | void (*setsckey) (unsigned char *key); /* for ssh 2 */ |
107 | void (*encrypt) (unsigned char *blk, int len); |
108 | void (*decrypt) (unsigned char *blk, int len); |
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109 | char *name; |
110 | int blksize; |
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111 | int keylen; |
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112 | }; |
113 | |
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114 | struct ssh2_ciphers { |
115 | int nciphers; |
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116 | const struct ssh2_cipher *const *list; |
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117 | }; |
118 | |
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119 | struct ssh_mac { |
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120 | void (*setcskey) (unsigned char *key); |
121 | void (*setsckey) (unsigned char *key); |
122 | void (*generate) (unsigned char *blk, int len, unsigned long seq); |
123 | int (*verify) (unsigned char *blk, int len, unsigned long seq); |
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124 | char *name; |
125 | int len; |
126 | }; |
127 | |
128 | struct ssh_kex { |
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129 | /* |
130 | * Plugging in another KEX algorithm requires structural chaos, |
131 | * so it's hard to abstract them into nice little structures |
132 | * like this. Hence, for the moment, this is just a |
133 | * placeholder. I claim justification in the fact that OpenSSH |
134 | * does this too :-) |
135 | */ |
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136 | char *name; |
137 | }; |
138 | |
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139 | struct ssh_signkey { |
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140 | void *(*newkey) (char *data, int len); |
141 | void (*freekey) (void *key); |
142 | char *(*fmtkey) (void *key); |
143 | unsigned char *(*public_blob) (void *key, int *len); |
144 | unsigned char *(*private_blob) (void *key, int *len); |
145 | void *(*createkey) (unsigned char *pub_blob, int pub_len, |
146 | unsigned char *priv_blob, int priv_len); |
147 | void *(*openssh_createkey) (unsigned char **blob, int *len); |
148 | int (*openssh_fmtkey) (void *key, unsigned char *blob, int len); |
149 | char *(*fingerprint) (void *key); |
150 | int (*verifysig) (void *key, char *sig, int siglen, |
151 | char *data, int datalen); |
152 | unsigned char *(*sign) (void *key, char *data, int datalen, |
153 | int *siglen); |
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154 | char *name; |
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155 | char *keytype; /* for host key cache */ |
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156 | }; |
157 | |
158 | struct ssh_compress { |
159 | char *name; |
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160 | void (*compress_init) (void); |
161 | int (*compress) (unsigned char *block, int len, |
162 | unsigned char **outblock, int *outlen); |
163 | void (*decompress_init) (void); |
164 | int (*decompress) (unsigned char *block, int len, |
165 | unsigned char **outblock, int *outlen); |
166 | int (*disable_compression) (void); |
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167 | }; |
168 | |
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169 | struct ssh2_userkey { |
170 | const struct ssh_signkey *alg; /* the key algorithm */ |
171 | void *data; /* the key data */ |
172 | char *comment; /* the key comment */ |
173 | }; |
174 | |
175 | extern const struct ssh_cipher ssh_3des; |
176 | extern const struct ssh_cipher ssh_des; |
177 | extern const struct ssh_cipher ssh_blowfish_ssh1; |
178 | extern const struct ssh2_ciphers ssh2_3des; |
179 | extern const struct ssh2_ciphers ssh2_aes; |
180 | extern const struct ssh2_ciphers ssh2_blowfish; |
181 | extern const struct ssh_kex ssh_diffiehellman; |
182 | extern const struct ssh_kex ssh_diffiehellman_gex; |
183 | extern const struct ssh_signkey ssh_dss; |
184 | extern const struct ssh_signkey ssh_rsa; |
185 | extern const struct ssh_mac ssh_md5; |
186 | extern const struct ssh_mac ssh_sha1; |
187 | extern const struct ssh_mac ssh_sha1_buggy; |
188 | |
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189 | /* |
190 | * PuTTY version number formatted as an SSH version string. |
191 | */ |
192 | extern char sshver[]; |
193 | |
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194 | #ifndef MSCRYPTOAPI |
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195 | void SHATransform(word32 * digest, word32 * data); |
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196 | #endif |
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197 | |
198 | int random_byte(void); |
199 | void random_add_noise(void *noise, int length); |
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200 | void random_add_heavynoise(void *noise, int length); |
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201 | |
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202 | void logevent(char *); |
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203 | void *new_sock_channel(Socket s); // allocates and register a new channel for port forwarding |
204 | void ssh_send_port_open(void *channel, char *hostname, int port, char *org); |
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205 | |
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206 | Bignum copybn(Bignum b); |
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207 | Bignum bn_power_2(int n); |
208 | void bn_restore_invariant(Bignum b); |
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209 | Bignum bignum_from_short(unsigned short n); |
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210 | void freebn(Bignum b); |
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211 | Bignum modpow(Bignum base, Bignum exp, Bignum mod); |
212 | Bignum modmul(Bignum a, Bignum b, Bignum mod); |
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213 | void decbn(Bignum n); |
214 | extern Bignum Zero, One; |
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215 | Bignum bignum_from_bytes(unsigned char *data, int nbytes); |
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216 | int ssh1_read_bignum(unsigned char *data, Bignum * result); |
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217 | int bignum_bitcount(Bignum bn); |
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218 | int ssh1_bignum_length(Bignum bn); |
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219 | int ssh2_bignum_length(Bignum bn); |
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220 | int bignum_byte(Bignum bn, int i); |
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221 | int bignum_bit(Bignum bn, int i); |
222 | void bignum_set_bit(Bignum bn, int i, int value); |
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223 | int ssh1_write_bignum(void *data, Bignum bn); |
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224 | Bignum biggcd(Bignum a, Bignum b); |
225 | unsigned short bignum_mod_short(Bignum number, unsigned short modulus); |
226 | Bignum bignum_add_long(Bignum number, unsigned long addend); |
227 | Bignum bigmul(Bignum a, Bignum b); |
228 | Bignum modinv(Bignum number, Bignum modulus); |
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229 | Bignum bignum_bitmask(Bignum number); |
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230 | Bignum bignum_rshift(Bignum number, int shift); |
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231 | int bignum_cmp(Bignum a, Bignum b); |
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232 | char *bignum_decimal(Bignum x); |
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233 | |
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234 | void dh_setup_group1(void); |
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235 | void dh_setup_group(Bignum pval, Bignum gval); |
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236 | void dh_cleanup(void); |
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237 | Bignum dh_create_e(int nbits); |
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238 | Bignum dh_find_K(Bignum f); |
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239 | |
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240 | int loadrsakey(char *filename, struct RSAKey *key, char *passphrase); |
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241 | int rsakey_encrypted(char *filename, char **comment); |
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242 | |
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243 | int saversakey(char *filename, struct RSAKey *key, char *passphrase); |
244 | |
245 | void base64_encode_atom(unsigned char *data, int n, char *out); |
246 | |
247 | /* ssh2_load_userkey can return this as an error */ |
248 | extern struct ssh2_userkey ssh2_wrong_passphrase; |
249 | #define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase) |
250 | |
251 | int ssh2_userkey_encrypted(char *filename, char **comment); |
252 | struct ssh2_userkey *ssh2_load_userkey(char *filename, char *passphrase); |
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253 | char *ssh2_userkey_loadpub(char *filename, char **algorithm, |
254 | int *pub_blob_len); |
255 | int ssh2_save_userkey(char *filename, struct ssh2_userkey *key, |
256 | char *passphrase); |
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257 | |
258 | int keyfile_version(char *filename); |
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259 | |
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260 | void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len); |
261 | void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len); |
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262 | void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk, |
263 | int len); |
264 | void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk, |
265 | int len); |
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266 | |
267 | /* |
268 | * For progress updates in the key generation utility. |
269 | */ |
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270 | typedef void (*progfn_t) (void *param, int phase, int progress); |
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271 | |
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272 | int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn, |
273 | void *pfnparam); |
274 | Bignum primegen(int bits, int modulus, int residue, int phase, |
275 | progfn_t pfn, void *pfnparam); |
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276 | |
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277 | |
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278 | /* |
279 | * zlib compression. |
280 | */ |
281 | void zlib_compress_init(void); |
282 | void zlib_decompress_init(void); |
283 | int zlib_compress_block(unsigned char *block, int len, |
284 | unsigned char **outblock, int *outlen); |
285 | int zlib_decompress_block(unsigned char *block, int len, |
286 | unsigned char **outblock, int *outlen); |
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287 | |
288 | /* |
289 | * SSH1 agent messages. |
290 | */ |
291 | #define SSH1_AGENTC_REQUEST_RSA_IDENTITIES 1 |
292 | #define SSH1_AGENT_RSA_IDENTITIES_ANSWER 2 |
293 | #define SSH1_AGENTC_RSA_CHALLENGE 3 |
294 | #define SSH1_AGENT_RSA_RESPONSE 4 |
295 | #define SSH1_AGENTC_ADD_RSA_IDENTITY 7 |
296 | #define SSH1_AGENTC_REMOVE_RSA_IDENTITY 8 |
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297 | #define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */ |
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298 | |
299 | /* |
300 | * Messages common to SSH1 and OpenSSH's SSH2. |
301 | */ |
302 | #define SSH_AGENT_FAILURE 5 |
303 | #define SSH_AGENT_SUCCESS 6 |
304 | |
305 | /* |
306 | * OpenSSH's SSH2 agent messages. |
307 | */ |
308 | #define SSH2_AGENTC_REQUEST_IDENTITIES 11 |
309 | #define SSH2_AGENT_IDENTITIES_ANSWER 12 |
310 | #define SSH2_AGENTC_SIGN_REQUEST 13 |
311 | #define SSH2_AGENT_SIGN_RESPONSE 14 |
312 | #define SSH2_AGENTC_ADD_IDENTITY 17 |
313 | #define SSH2_AGENTC_REMOVE_IDENTITY 18 |
314 | #define SSH2_AGENTC_REMOVE_ALL_IDENTITIES 19 |