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 /*
  24  * A Bignum is stored as a sequence of `unsigned short' words. The
  25  * first tells how many remain; the remaining ones are digits, LS
  26  * first.
  27  */
  28 typedef unsigned short *Bignum;
  29
  30 struct RSAKey {
  31     int bits;
  32     int bytes;
  33 #ifdef MSCRYPTOAPI
  34     unsigned long exponent;
  35     unsigned char *modulus;
  36 #else
  37     Bignum modulus;
  38     Bignum exponent;
  39     Bignum private_exponent;
  40 #endif
  41     char *comment;
  42 };
  43
  44 struct RSAAux {
  45     Bignum p;
  46     Bignum q;
  47     Bignum iqmp;
  48 };
  49
  50 int makekey(unsigned char *data, struct RSAKey *result,
  51             unsigned char **keystr, int order);
  52 int makeprivate(unsigned char *data, struct RSAKey *result);
  53 void rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
  54 Bignum rsadecrypt(Bignum input, struct RSAKey *key);
  55 void rsasign(unsigned char *data, int length, struct RSAKey *key);
  56 void rsasanitise(struct RSAKey *key);
  57 int rsastr_len(struct RSAKey *key);
  58 void rsastr_fmt(char *str, struct RSAKey *key);
  59 void rsa_fingerprint(char *str, int len, struct RSAKey *key);
  60 void freersakey(struct RSAKey *key);
  61
  62 typedef unsigned int word32;
  63 typedef unsigned int uint32;
  64
  65 unsigned long crc32(const void *s, size_t len);
  66
  67 typedef struct {
  68     uint32 h[4];
  69 } MD5_Core_State;
  70
  71 struct MD5Context {
  72 #ifdef MSCRYPTOAPI
  73     unsigned long hHash;
  74 #else
  75     MD5_Core_State core;
  76     unsigned char block[64];
  77     int blkused;
  78     uint32 lenhi, lenlo;
  79 #endif
  80 };
  81
  82 void MD5Init(struct MD5Context *context);
  83 void MD5Update(struct MD5Context *context, unsigned char const *buf,
  84                unsigned len);
  85 void MD5Final(unsigned char digest[16], struct MD5Context *context);
  86
  87 typedef struct {
  88     uint32 h[5];
  89     unsigned char block[64];
  90     int blkused;
  91     uint32 lenhi, lenlo;
  92 } SHA_State;
  93
  94 void SHA_Init(SHA_State *s);
  95 void SHA_Bytes(SHA_State *s, void *p, int len);
  96 void SHA_Final(SHA_State *s, unsigned char *output);
  97 void SHA_Simple(void *p, int len, unsigned char *output);
  98
  99 struct ssh_cipher {
 100     void (*sesskey)(unsigned char *key);   /* for ssh 1 */
 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 };
 110
 111 struct ssh_mac {
 112     void (*setcskey)(unsigned char *key);
 113     void (*setsckey)(unsigned char *key);
 114     void (*generate)(unsigned char *blk, int len, unsigned long seq);
 115     int (*verify)(unsigned char *blk, int len, unsigned long seq);
 116     char *name;
 117     int len;
 118 };
 119
 120 struct ssh_kex {
 121     /*
 122      * Plugging in another KEX algorithm requires structural chaos,
 123      * so it's hard to abstract them into nice little structures
 124      * like this. Hence, for the moment, this is just a
 125      * placeholder. I claim justification in the fact that OpenSSH
 126      * does this too :-)
 127      */
 128     char *name;
 129 };
 130
 131 struct ssh_signkey {
 132     void *(*newkey)(char *data, int len);
 133     void (*freekey)(void *key);
 134     char *(*fmtkey)(void *key);
 135     char *(*fingerprint)(void *key);
 136     int (*verifysig)(void *key, char *sig, int siglen,
 137                      char *data, int datalen);
 138     int (*sign)(void *key, char *sig, int siglen,
 139                 char *data, int datalen);
 140     char *name;
 141     char *keytype;                     /* for host key cache */
 142 };
 143
 144 struct ssh_compress {
 145     char *name;
 146     void (*compress_init)(void);
 147     int (*compress)(unsigned char *block, int len,
 148                     unsigned char **outblock, int *outlen);
 149     void (*decompress_init)(void);
 150     int (*decompress)(unsigned char *block, int len,
 151                       unsigned char **outblock, int *outlen);
 152 };
 153
 154 #ifndef MSCRYPTOAPI
 155 void SHATransform(word32 *digest, word32 *data);
 156 #endif
 157
 158 int random_byte(void);
 159 void random_add_noise(void *noise, int length);
 160 void random_add_heavynoise(void *noise, int length);
 161
 162 void logevent (char *);
 163
 164 Bignum newbn(int length);
 165 Bignum copybn(Bignum b);
 166 Bignum bignum_from_short(unsigned short n);
 167 void freebn(Bignum b);
 168 Bignum modpow(Bignum base, Bignum exp, Bignum mod);
 169 Bignum modmul(Bignum a, Bignum b, Bignum mod);
 170 void decbn(Bignum n);
 171 extern Bignum Zero, One;
 172 int ssh1_read_bignum(unsigned char *data, Bignum *result);
 173 int ssh1_bignum_bitcount(Bignum bn);
 174 int ssh1_bignum_length(Bignum bn);
 175 int bignum_byte(Bignum bn, int i);
 176 int bignum_bit(Bignum bn, int i);
 177 void bignum_set_bit(Bignum bn, int i, int value);
 178 int ssh1_write_bignum(void *data, Bignum bn);
 179 Bignum biggcd(Bignum a, Bignum b);
 180 unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
 181 Bignum bignum_add_long(Bignum number, unsigned long addend);
 182 Bignum bigmul(Bignum a, Bignum b);
 183 Bignum modinv(Bignum number, Bignum modulus);
 184 Bignum bignum_rshift(Bignum number, int shift);
 185 int bignum_cmp(Bignum a, Bignum b);
 186 char *bignum_decimal(Bignum x);
 187
 188 Bignum dh_create_e(void);
 189 Bignum dh_find_K(Bignum f);
 190
 191 int loadrsakey(char *filename, struct RSAKey *key, struct RSAAux *aux,
 192                char *passphrase);
 193 int rsakey_encrypted(char *filename, char **comment);
 194
 195 int saversakey(char *filename, struct RSAKey *key, struct RSAAux *aux,
 196                char *passphrase);
 197
 198 void des3_decrypt_pubkey(unsigned char *key,
 199                          unsigned char *blk, int len);
 200 void des3_encrypt_pubkey(unsigned char *key,
 201                          unsigned char *blk, int len);
 202
 203 /*
 204  * For progress updates in the key generation utility.
 205  */
 206 typedef void (*progfn_t)(void *param, int phase, int progress);
 207
 208 int rsa_generate(struct RSAKey *key, struct RSAAux *aux, int bits,
 209                  progfn_t pfn, void *pfnparam);
 210 Bignum primegen(int bits, int modulus, int residue,
 211                 int phase, progfn_t pfn, void *pfnparam);
 212
 213 /*
 214  * zlib compression.
 215  */
 216 void zlib_compress_init(void);
 217 void zlib_decompress_init(void);
 218 int zlib_compress_block(unsigned char *block, int len,
 219                         unsigned char **outblock, int *outlen);
 220 int zlib_decompress_block(unsigned char *block, int len,
 221                           unsigned char **outblock, int *outlen);