git.distorted.org.uk Git - u/mdw/putty/blob - ssh.h

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