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,
 152                             int *siglen);
 153     char *name;
 154     char *keytype;                     /* for host key cache */
 155 };
 156
 157 struct ssh_compress {
 158     char *name;
 159     void (*compress_init) (void);
 160     int (*compress) (unsigned char *block, int len,
 161                      unsigned char **outblock, int *outlen);
 162     void (*decompress_init) (void);
 163     int (*decompress) (unsigned char *block, int len,
 164                        unsigned char **outblock, int *outlen);
 165     int (*disable_compression) (void);
 166 };
 167
 168 struct ssh2_userkey {
 169     const struct ssh_signkey *alg;     /* the key algorithm */
 170     void *data;                        /* the key data */
 171     char *comment;                     /* the key comment */
 172 };
 173
 174 extern const struct ssh_cipher ssh_3des;
 175 extern const struct ssh_cipher ssh_des;
 176 extern const struct ssh_cipher ssh_blowfish_ssh1;
 177 extern const struct ssh2_ciphers ssh2_3des;
 178 extern const struct ssh2_ciphers ssh2_aes;
 179 extern const struct ssh2_ciphers ssh2_blowfish;
 180 extern const struct ssh_kex ssh_diffiehellman;
 181 extern const struct ssh_kex ssh_diffiehellman_gex;
 182 extern const struct ssh_signkey ssh_dss;
 183 extern const struct ssh_signkey ssh_rsa;
 184 extern const struct ssh_mac ssh_md5;
 185 extern const struct ssh_mac ssh_sha1;
 186 extern const struct ssh_mac ssh_sha1_buggy;
 187
 188 /*
 189  * PuTTY version number formatted as an SSH version string.
 190  */
 191 extern char sshver[];
 192
 193 #ifndef MSCRYPTOAPI
 194 void SHATransform(word32 * digest, word32 * data);
 195 #endif
 196
 197 int random_byte(void);
 198 void random_add_noise(void *noise, int length);
 199 void random_add_heavynoise(void *noise, int length);
 200
 201 void logevent(char *);
 202
 203 Bignum copybn(Bignum b);
 204 Bignum bn_power_2(int n);
 205 void bn_restore_invariant(Bignum b);
 206 Bignum bignum_from_short(unsigned short n);
 207 void freebn(Bignum b);
 208 Bignum modpow(Bignum base, Bignum exp, Bignum mod);
 209 Bignum modmul(Bignum a, Bignum b, Bignum mod);
 210 void decbn(Bignum n);
 211 extern Bignum Zero, One;
 212 Bignum bignum_from_bytes(unsigned char *data, int nbytes);
 213 int ssh1_read_bignum(unsigned char *data, Bignum * result);
 214 int bignum_bitcount(Bignum bn);
 215 int ssh1_bignum_length(Bignum bn);
 216 int ssh2_bignum_length(Bignum bn);
 217 int bignum_byte(Bignum bn, int i);
 218 int bignum_bit(Bignum bn, int i);
 219 void bignum_set_bit(Bignum bn, int i, int value);
 220 int ssh1_write_bignum(void *data, Bignum bn);
 221 Bignum biggcd(Bignum a, Bignum b);
 222 unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
 223 Bignum bignum_add_long(Bignum number, unsigned long addend);
 224 Bignum bigmul(Bignum a, Bignum b);
 225 Bignum modinv(Bignum number, Bignum modulus);
 226 Bignum bignum_bitmask(Bignum number);
 227 Bignum bignum_rshift(Bignum number, int shift);
 228 int bignum_cmp(Bignum a, Bignum b);
 229 char *bignum_decimal(Bignum x);
 230
 231 void dh_setup_group1(void);
 232 void dh_setup_group(Bignum pval, Bignum gval);
 233 void dh_cleanup(void);
 234 Bignum dh_create_e(int nbits);
 235 Bignum dh_find_K(Bignum f);
 236
 237 int loadrsakey(char *filename, struct RSAKey *key, char *passphrase);
 238 int rsakey_encrypted(char *filename, char **comment);
 239
 240 int saversakey(char *filename, struct RSAKey *key, char *passphrase);
 241
 242 void base64_encode_atom(unsigned char *data, int n, char *out);
 243
 244 /* ssh2_load_userkey can return this as an error */
 245 extern struct ssh2_userkey ssh2_wrong_passphrase;
 246 #define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)
 247
 248 int ssh2_userkey_encrypted(char *filename, char **comment);
 249 struct ssh2_userkey *ssh2_load_userkey(char *filename, char *passphrase);
 250 char *ssh2_userkey_loadpub(char *filename, char **algorithm,
 251                            int *pub_blob_len);
 252 int ssh2_save_userkey(char *filename, struct ssh2_userkey *key,
 253                       char *passphrase);
 254
 255 int keyfile_version(char *filename);
 256
 257 void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 258 void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 259 void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk,
 260                            int len);
 261 void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk,
 262                            int len);
 263
 264 /*
 265  * For progress updates in the key generation utility.
 266  */
 267 typedef void (*progfn_t) (void *param, int phase, int progress);
 268
 269 int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
 270                  void *pfnparam);
 271 Bignum primegen(int bits, int modulus, int residue, int phase,
 272                 progfn_t pfn, void *pfnparam);
 273
 274 /*
 275  * zlib compression.
 276  */
 277 void zlib_compress_init(void);
 278 void zlib_decompress_init(void);
 279 int zlib_compress_block(unsigned char *block, int len,
 280                         unsigned char **outblock, int *outlen);
 281 int zlib_decompress_block(unsigned char *block, int len,
 282                           unsigned char **outblock, int *outlen);
 283
 284 /*
 285  * SSH1 agent messages.
 286  */
 287 #define SSH1_AGENTC_REQUEST_RSA_IDENTITIES    1
 288 #define SSH1_AGENT_RSA_IDENTITIES_ANSWER      2
 289 #define SSH1_AGENTC_RSA_CHALLENGE             3
 290 #define SSH1_AGENT_RSA_RESPONSE               4
 291 #define SSH1_AGENTC_ADD_RSA_IDENTITY          7
 292 #define SSH1_AGENTC_REMOVE_RSA_IDENTITY       8
 293 #define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */
 294
 295 /*
 296  * Messages common to SSH1 and OpenSSH's SSH2.
 297  */
 298 #define SSH_AGENT_FAILURE                    5
 299 #define SSH_AGENT_SUCCESS                    6
 300
 301 /*
 302  * OpenSSH's SSH2 agent messages.
 303  */
 304 #define SSH2_AGENTC_REQUEST_IDENTITIES          11
 305 #define SSH2_AGENT_IDENTITIES_ANSWER            12
 306 #define SSH2_AGENTC_SIGN_REQUEST                13
 307 #define SSH2_AGENT_SIGN_RESPONSE                14
 308 #define SSH2_AGENTC_ADD_IDENTITY                17
 309 #define SSH2_AGENTC_REMOVE_IDENTITY             18
 310 #define SSH2_AGENTC_REMOVE_ALL_IDENTITIES       19