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 #endif
  38     char *comment;
  39 };
  40
  41 struct RSAAux {
  42     Bignum p;
  43     Bignum q;
  44     Bignum iqmp;
  45 };
  46
  47 int makekey(unsigned char *data, struct RSAKey *result,
  48             unsigned char **keystr, int order);
  49 int makeprivate(unsigned char *data, struct RSAKey *result);
  50 void rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
  51 Bignum rsadecrypt(Bignum input, struct RSAKey *key);
  52 void rsasign(unsigned char *data, int length, struct RSAKey *key);
  53 void rsasanitise(struct RSAKey *key);
  54 int rsastr_len(struct RSAKey *key);
  55 void rsastr_fmt(char *str, struct RSAKey *key);
  56 void rsa_fingerprint(char *str, int len, struct RSAKey *key);
  57 void freersakey(struct RSAKey *key);
  58
  59 typedef unsigned int word32;
  60 typedef unsigned int uint32;
  61
  62 unsigned long crc32(const void *s, size_t len);
  63
  64 typedef struct {
  65     uint32 h[4];
  66 } MD5_Core_State;
  67
  68 struct MD5Context {
  69 #ifdef MSCRYPTOAPI
  70     unsigned long hHash;
  71 #else
  72     MD5_Core_State core;
  73     unsigned char block[64];
  74     int blkused;
  75     uint32 lenhi, lenlo;
  76 #endif
  77 };
  78
  79 void MD5Init(struct MD5Context *context);
  80 void MD5Update(struct MD5Context *context, unsigned char const *buf,
  81                unsigned len);
  82 void MD5Final(unsigned char digest[16], struct MD5Context *context);
  83
  84 typedef struct {
  85     uint32 h[5];
  86     unsigned char block[64];
  87     int blkused;
  88     uint32 lenhi, lenlo;
  89 } SHA_State;
  90
  91 void SHA_Init(SHA_State *s);
  92 void SHA_Bytes(SHA_State *s, void *p, int len);
  93 void SHA_Final(SHA_State *s, unsigned char *output);
  94 void SHA_Simple(void *p, int len, unsigned char *output);
  95
  96 struct ssh_cipher {
  97     void (*sesskey)(unsigned char *key);   /* for ssh 1 */
  98     void (*encrypt)(unsigned char *blk, int len);
  99     void (*decrypt)(unsigned char *blk, int len);
 100     int blksize;
 101 };
 102
 103 struct ssh2_cipher {
 104     void (*setcsiv)(unsigned char *key);   /* for ssh 2 */
 105     void (*setcskey)(unsigned char *key);   /* for ssh 2 */
 106     void (*setsciv)(unsigned char *key);   /* for ssh 2 */
 107     void (*setsckey)(unsigned char *key);   /* for ssh 2 */
 108     void (*encrypt)(unsigned char *blk, int len);
 109     void (*decrypt)(unsigned char *blk, int len);
 110     char *name;
 111     int blksize;
 112     int keylen;
 113 };
 114
 115 struct ssh2_ciphers {
 116     int nciphers;
 117     struct ssh2_cipher **list;
 118 };
 119
 120 struct ssh_mac {
 121     void (*setcskey)(unsigned char *key);
 122     void (*setsckey)(unsigned char *key);
 123     void (*generate)(unsigned char *blk, int len, unsigned long seq);
 124     int (*verify)(unsigned char *blk, int len, unsigned long seq);
 125     char *name;
 126     int len;
 127 };
 128
 129 struct ssh_kex {
 130     /*
 131      * Plugging in another KEX algorithm requires structural chaos,
 132      * so it's hard to abstract them into nice little structures
 133      * like this. Hence, for the moment, this is just a
 134      * placeholder. I claim justification in the fact that OpenSSH
 135      * does this too :-)
 136      */
 137     char *name;
 138 };
 139
 140 struct ssh_signkey {
 141     void *(*newkey)(char *data, int len);
 142     void (*freekey)(void *key);
 143     char *(*fmtkey)(void *key);
 144     char *(*fingerprint)(void *key);
 145     int (*verifysig)(void *key, char *sig, int siglen,
 146                      char *data, int datalen);
 147     int (*sign)(void *key, char *sig, int siglen,
 148                 char *data, int datalen);
 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 #ifndef MSCRYPTOAPI
 164 void SHATransform(word32 *digest, word32 *data);
 165 #endif
 166
 167 int random_byte(void);
 168 void random_add_noise(void *noise, int length);
 169 void random_add_heavynoise(void *noise, int length);
 170
 171 void logevent (char *);
 172
 173 Bignum copybn(Bignum b);
 174 Bignum bn_power_2(int n);
 175 void bn_restore_invariant(Bignum b);
 176 Bignum bignum_from_short(unsigned short n);
 177 void freebn(Bignum b);
 178 Bignum modpow(Bignum base, Bignum exp, Bignum mod);
 179 Bignum modmul(Bignum a, Bignum b, Bignum mod);
 180 void decbn(Bignum n);
 181 extern Bignum Zero, One;
 182 Bignum bignum_from_bytes(unsigned char *data, int nbytes);
 183 int ssh1_read_bignum(unsigned char *data, Bignum *result);
 184 int ssh1_bignum_bitcount(Bignum bn);
 185 int ssh1_bignum_length(Bignum bn);
 186 int bignum_byte(Bignum bn, int i);
 187 int bignum_bit(Bignum bn, int i);
 188 void bignum_set_bit(Bignum bn, int i, int value);
 189 int ssh1_write_bignum(void *data, Bignum bn);
 190 Bignum biggcd(Bignum a, Bignum b);
 191 unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
 192 Bignum bignum_add_long(Bignum number, unsigned long addend);
 193 Bignum bigmul(Bignum a, Bignum b);
 194 Bignum modinv(Bignum number, Bignum modulus);
 195 Bignum bignum_bitmask(Bignum number);
 196 Bignum bignum_rshift(Bignum number, int shift);
 197 int bignum_cmp(Bignum a, Bignum b);
 198 char *bignum_decimal(Bignum x);
 199
 200 void dh_setup_group1(void);
 201 void dh_setup_group(Bignum pval, Bignum gval);
 202 void dh_cleanup(void);
 203 Bignum dh_create_e(void);
 204 Bignum dh_find_K(Bignum f);
 205
 206 int loadrsakey(char *filename, struct RSAKey *key, struct RSAAux *aux,
 207                char *passphrase);
 208 int rsakey_encrypted(char *filename, char **comment);
 209
 210 int saversakey(char *filename, struct RSAKey *key, struct RSAAux *aux,
 211                char *passphrase);
 212
 213 void des3_decrypt_pubkey(unsigned char *key,
 214                          unsigned char *blk, int len);
 215 void des3_encrypt_pubkey(unsigned char *key,
 216                          unsigned char *blk, int len);
 217
 218 /*
 219  * For progress updates in the key generation utility.
 220  */
 221 typedef void (*progfn_t)(void *param, int phase, int progress);
 222
 223 int rsa_generate(struct RSAKey *key, struct RSAAux *aux, int bits,
 224                  progfn_t pfn, void *pfnparam);
 225 Bignum primegen(int bits, int modulus, int residue,
 226                 int phase, progfn_t pfn, void *pfnparam);
 227
 228 /*
 229  * zlib compression.
 230  */
 231 void zlib_compress_init(void);
 232 void zlib_decompress_init(void);
 233 int zlib_compress_block(unsigned char *block, int len,
 234                         unsigned char **outblock, int *outlen);
 235 int zlib_decompress_block(unsigned char *block, int len,
 236                           unsigned char **outblock, int *outlen);