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 void freersakey(struct RSAKey *key);
  55
  56 typedef unsigned int word32;
  57 typedef unsigned int uint32;
  58
  59 unsigned long crc32(const void *s, size_t len);
  60
  61 typedef struct {
  62     uint32 h[4];
  63 } MD5_Core_State;
  64
  65 struct MD5Context {
  66 #ifdef MSCRYPTOAPI
  67     unsigned long hHash;
  68 #else
  69     MD5_Core_State core;
  70     unsigned char block[64];
  71     int blkused;
  72     uint32 lenhi, lenlo;
  73 #endif
  74 };
  75
  76 void MD5Init(struct MD5Context *context);
  77 void MD5Update(struct MD5Context *context, unsigned char const *buf,
  78                unsigned len);
  79 void MD5Final(unsigned char digest[16], struct MD5Context *context);
  80
  81 typedef struct {
  82     uint32 h[5];
  83     unsigned char block[64];
  84     int blkused;
  85     uint32 lenhi, lenlo;
  86 } SHA_State;
  87
  88 void SHA_Init(SHA_State *s);
  89 void SHA_Bytes(SHA_State *s, void *p, int len);
  90 void SHA_Final(SHA_State *s, unsigned char *output);
  91 void SHA_Simple(void *p, int len, unsigned char *output);
  92
  93 struct ssh_cipher {
  94     void (*sesskey)(unsigned char *key);   /* for ssh 1 */
  95     void (*encrypt)(unsigned char *blk, int len);
  96     void (*decrypt)(unsigned char *blk, int len);
  97     int blksize;
  98 };
  99
 100 struct ssh2_cipher {
 101     void (*setcsiv)(unsigned char *key);   /* for ssh 2 */
 102     void (*setcskey)(unsigned char *key);   /* for ssh 2 */
 103     void (*setsciv)(unsigned char *key);   /* for ssh 2 */
 104     void (*setsckey)(unsigned char *key);   /* for ssh 2 */
 105     void (*encrypt)(unsigned char *blk, int len);
 106     void (*decrypt)(unsigned char *blk, int len);
 107     char *name;
 108     int blksize;
 109     int keylen;
 110 };
 111
 112 struct ssh2_ciphers {
 113     int nciphers;
 114     const struct ssh2_cipher *const *list;
 115 };
 116
 117 struct ssh_mac {
 118     void (*setcskey)(unsigned char *key);
 119     void (*setsckey)(unsigned char *key);
 120     void (*generate)(unsigned char *blk, int len, unsigned long seq);
 121     int (*verify)(unsigned char *blk, int len, unsigned long seq);
 122     char *name;
 123     int len;
 124 };
 125
 126 struct ssh_kex {
 127     /*
 128      * Plugging in another KEX algorithm requires structural chaos,
 129      * so it's hard to abstract them into nice little structures
 130      * like this. Hence, for the moment, this is just a
 131      * placeholder. I claim justification in the fact that OpenSSH
 132      * does this too :-)
 133      */
 134     char *name;
 135 };
 136
 137 struct ssh_signkey {
 138     void *(*newkey)(char *data, int len);
 139     void (*freekey)(void *key);
 140     char *(*fmtkey)(void *key);
 141     unsigned char *(*public_blob)(void *key, int *len);
 142     unsigned char *(*private_blob)(void *key, int *len);
 143     void *(*createkey)(unsigned char *pub_blob, int pub_len,
 144                        unsigned char *priv_blob, int priv_len);
 145     char *(*fingerprint)(void *key);
 146     int (*verifysig)(void *key, char *sig, int siglen,
 147                      char *data, int datalen);
 148     unsigned char *(*sign)(void *key, char *data, int datalen, int *siglen);
 149     char *name;
 150     char *keytype;                     /* for host key cache */
 151 };
 152
 153 struct ssh_compress {
 154     char *name;
 155     void (*compress_init)(void);
 156     int (*compress)(unsigned char *block, int len,
 157                     unsigned char **outblock, int *outlen);
 158     void (*decompress_init)(void);
 159     int (*decompress)(unsigned char *block, int len,
 160                       unsigned char **outblock, int *outlen);
 161 };
 162
 163 struct ssh2_userkey {
 164     const struct ssh_signkey *alg;     /* the key algorithm */
 165     void *data;                        /* the key data */
 166     char *comment;                     /* the key comment */
 167 };
 168
 169 extern const struct ssh_cipher ssh_3des;
 170 extern const struct ssh_cipher ssh_des;
 171 extern const struct ssh_cipher ssh_blowfish_ssh1;
 172 extern const struct ssh2_ciphers ssh2_3des;
 173 extern const struct ssh2_ciphers ssh2_aes;
 174 extern const struct ssh2_ciphers ssh2_blowfish;
 175 extern const struct ssh_kex ssh_diffiehellman;
 176 extern const struct ssh_kex ssh_diffiehellman_gex;
 177 extern const struct ssh_signkey ssh_dss;
 178 extern const struct ssh_signkey ssh_rsa;
 179 extern const struct ssh_mac ssh_md5;
 180 extern const struct ssh_mac ssh_sha1;
 181 extern const struct ssh_mac ssh_sha1_buggy;
 182
 183 #ifndef MSCRYPTOAPI
 184 void SHATransform(word32 *digest, word32 *data);
 185 #endif
 186
 187 int random_byte(void);
 188 void random_add_noise(void *noise, int length);
 189 void random_add_heavynoise(void *noise, int length);
 190
 191 void logevent (char *);
 192
 193 Bignum copybn(Bignum b);
 194 Bignum bn_power_2(int n);
 195 void bn_restore_invariant(Bignum b);
 196 Bignum bignum_from_short(unsigned short n);
 197 void freebn(Bignum b);
 198 Bignum modpow(Bignum base, Bignum exp, Bignum mod);
 199 Bignum modmul(Bignum a, Bignum b, Bignum mod);
 200 void decbn(Bignum n);
 201 extern Bignum Zero, One;
 202 Bignum bignum_from_bytes(unsigned char *data, int nbytes);
 203 int ssh1_read_bignum(unsigned char *data, Bignum *result);
 204 int ssh1_bignum_bitcount(Bignum bn);
 205 int ssh1_bignum_length(Bignum bn);
 206 int bignum_byte(Bignum bn, int i);
 207 int bignum_bit(Bignum bn, int i);
 208 void bignum_set_bit(Bignum bn, int i, int value);
 209 int ssh1_write_bignum(void *data, Bignum bn);
 210 Bignum biggcd(Bignum a, Bignum b);
 211 unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
 212 Bignum bignum_add_long(Bignum number, unsigned long addend);
 213 Bignum bigmul(Bignum a, Bignum b);
 214 Bignum modinv(Bignum number, Bignum modulus);
 215 Bignum bignum_bitmask(Bignum number);
 216 Bignum bignum_rshift(Bignum number, int shift);
 217 int bignum_cmp(Bignum a, Bignum b);
 218 char *bignum_decimal(Bignum x);
 219
 220 void dh_setup_group1(void);
 221 void dh_setup_group(Bignum pval, Bignum gval);
 222 void dh_cleanup(void);
 223 Bignum dh_create_e(void);
 224 Bignum dh_find_K(Bignum f);
 225
 226 int loadrsakey(char *filename, struct RSAKey *key, char *passphrase);
 227 int rsakey_encrypted(char *filename, char **comment);
 228
 229 int saversakey(char *filename, struct RSAKey *key, char *passphrase);
 230
 231 void base64_encode_atom(unsigned char *data, int n, char *out);
 232
 233 /* ssh2_load_userkey can return this as an error */
 234 extern struct ssh2_userkey ssh2_wrong_passphrase;
 235 #define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)
 236
 237 int ssh2_userkey_encrypted(char *filename, char **comment);
 238 struct ssh2_userkey *ssh2_load_userkey(char *filename, char *passphrase);
 239 char *ssh2_userkey_loadpub(char *filename, char **algorithm, int *pub_blob_len);
 240 int ssh2_save_userkey(char *filename, struct ssh2_userkey *key, char *passphrase);
 241
 242 int keyfile_version(char *filename);
 243
 244 void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 245 void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 246 void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 247 void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
 248
 249 /*
 250  * For progress updates in the key generation utility.
 251  */
 252 typedef void (*progfn_t)(void *param, int phase, int progress);
 253
 254 int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn, void *pfnparam);
 255 Bignum primegen(int bits, int modulus, int residue,
 256                 int phase, progfn_t pfn, void *pfnparam);
 257
 258 /*
 259  * zlib compression.
 260  */
 261 void zlib_compress_init(void);
 262 void zlib_decompress_init(void);
 263 int zlib_compress_block(unsigned char *block, int len,
 264                         unsigned char **outblock, int *outlen);
 265 int zlib_decompress_block(unsigned char *block, int len,
 266                           unsigned char **outblock, int *outlen);