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

   1 #include <string.h>
   2
   3 /*
   4  * Useful thing.
   5  */
   6 #ifndef lenof
   7 #define lenof(x) ( (sizeof((x))) / (sizeof(*(x))))
   8 #endif
   9
  10 #define SSH_CIPHER_IDEA         1
  11 #define SSH_CIPHER_DES          2
  12 #define SSH_CIPHER_3DES         3
  13 #define SSH_CIPHER_BLOWFISH     6
  14
  15 #ifdef MSCRYPTOAPI
  16 #define APIEXTRA 8
  17 #else
  18 #define APIEXTRA 0
  19 #endif
  20
  21 /*
  22  * A Bignum is stored as a sequence of `unsigned short' words. The
  23  * first tells how many remain; the remaining ones are digits, LS
  24  * first.
  25  */
  26 typedef unsigned short *Bignum;
  27
  28 struct RSAKey {
  29     int bits;
  30     int bytes;
  31 #ifdef MSCRYPTOAPI
  32     unsigned long exponent;
  33     unsigned char *modulus;
  34 #else
  35     Bignum modulus;
  36     Bignum exponent;
  37     Bignum private_exponent;
  38 #endif
  39     char *comment;
  40 };
  41
  42 struct RSAAux {
  43     Bignum p;
  44     Bignum q;
  45     Bignum iqmp;
  46 };
  47
  48 int makekey(unsigned char *data, struct RSAKey *result,
  49             unsigned char **keystr, int order);
  50 int makeprivate(unsigned char *data, struct RSAKey *result);
  51 void rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
  52 Bignum rsadecrypt(Bignum input, struct RSAKey *key);
  53 void rsasign(unsigned char *data, int length, struct RSAKey *key);
  54 void rsasanitise(struct RSAKey *key);
  55 int rsastr_len(struct RSAKey *key);
  56 void rsastr_fmt(char *str, struct RSAKey *key);
  57 void rsa_fingerprint(char *str, int len, struct RSAKey *key);
  58 void freersakey(struct RSAKey *key);
  59
  60 typedef unsigned int word32;
  61 typedef unsigned int uint32;
  62
  63 unsigned long crc32(const void *s, size_t len);
  64
  65 typedef struct {
  66     uint32 h[4];
  67 } MD5_Core_State;
  68
  69 struct MD5Context {
  70 #ifdef MSCRYPTOAPI
  71     unsigned long hHash;
  72 #else
  73     MD5_Core_State core;
  74     unsigned char block[64];
  75     int blkused;
  76     uint32 lenhi, lenlo;
  77 #endif
  78 };
  79
  80 void MD5Init(struct MD5Context *context);
  81 void MD5Update(struct MD5Context *context, unsigned char const *buf,
  82                unsigned len);
  83 void MD5Final(unsigned char digest[16], struct MD5Context *context);
  84
  85 typedef struct {
  86     uint32 h[5];
  87     unsigned char block[64];
  88     int blkused;
  89     uint32 lenhi, lenlo;
  90 } SHA_State;
  91
  92 void SHA_Init(SHA_State *s);
  93 void SHA_Bytes(SHA_State *s, void *p, int len);
  94 void SHA_Final(SHA_State *s, unsigned char *output);
  95 void SHA_Simple(void *p, int len, unsigned char *output);
  96
  97 struct ssh_cipher {
  98     void (*sesskey)(unsigned char *key);   /* for ssh 1 */
  99     void (*setcsiv)(unsigned char *key);   /* for ssh 2 */
 100     void (*setcskey)(unsigned char *key);   /* for ssh 2 */
 101     void (*setsciv)(unsigned char *key);   /* for ssh 2 */
 102     void (*setsckey)(unsigned char *key);   /* for ssh 2 */
 103     void (*encrypt)(unsigned char *blk, int len);
 104     void (*decrypt)(unsigned char *blk, int len);
 105     char *name;
 106     int blksize;
 107 };
 108
 109 struct ssh_mac {
 110     void (*setcskey)(unsigned char *key);
 111     void (*setsckey)(unsigned char *key);
 112     void (*generate)(unsigned char *blk, int len, unsigned long seq);
 113     int (*verify)(unsigned char *blk, int len, unsigned long seq);
 114     char *name;
 115     int len;
 116 };
 117
 118 struct ssh_kex {
 119     /*
 120      * Plugging in another KEX algorithm requires structural chaos,
 121      * so it's hard to abstract them into nice little structures
 122      * like this. Hence, for the moment, this is just a
 123      * placeholder. I claim justification in the fact that OpenSSH
 124      * does this too :-)
 125      */
 126     char *name;
 127 };
 128
 129 struct ssh_hostkey {
 130     void (*setkey)(char *data, int len);
 131     char *(*fmtkey)(void);
 132     char *(*fingerprint)(void);
 133     int (*verifysig)(char *sig, int siglen, char *data, int datalen);
 134     char *name;
 135     char *keytype;                     /* for host key cache */
 136 };
 137
 138 struct ssh_compress {
 139     char *name;
 140     void (*compress_init)(void);
 141     int (*compress)(unsigned char *block, int len,
 142                     unsigned char **outblock, int *outlen);
 143     void (*decompress_init)(void);
 144     int (*decompress)(unsigned char *block, int len,
 145                       unsigned char **outblock, int *outlen);
 146 };
 147
 148 #ifndef MSCRYPTOAPI
 149 void SHATransform(word32 *digest, word32 *data);
 150 #endif
 151
 152 int random_byte(void);
 153 void random_add_noise(void *noise, int length);
 154 void random_add_heavynoise(void *noise, int length);
 155
 156 void logevent (char *);
 157
 158 Bignum newbn(int length);
 159 Bignum copybn(Bignum b);
 160 Bignum bignum_from_short(unsigned short n);
 161 void freebn(Bignum b);
 162 Bignum modpow(Bignum base, Bignum exp, Bignum mod);
 163 Bignum modmul(Bignum a, Bignum b, Bignum mod);
 164 void decbn(Bignum n);
 165 extern Bignum Zero, One;
 166 int ssh1_read_bignum(unsigned char *data, Bignum *result);
 167 int ssh1_bignum_bitcount(Bignum bn);
 168 int ssh1_bignum_length(Bignum bn);
 169 int bignum_byte(Bignum bn, int i);
 170 int bignum_bit(Bignum bn, int i);
 171 void bignum_set_bit(Bignum bn, int i, int value);
 172 int ssh1_write_bignum(void *data, Bignum bn);
 173 Bignum biggcd(Bignum a, Bignum b);
 174 unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
 175 Bignum bignum_add_long(Bignum number, unsigned long addend);
 176 Bignum bigmul(Bignum a, Bignum b);
 177 Bignum modinv(Bignum number, Bignum modulus);
 178 Bignum bignum_rshift(Bignum number, int shift);
 179 int bignum_cmp(Bignum a, Bignum b);
 180 char *bignum_decimal(Bignum x);
 181
 182 Bignum dh_create_e(void);
 183 Bignum dh_find_K(Bignum f);
 184
 185 int loadrsakey(char *filename, struct RSAKey *key, struct RSAAux *aux,
 186                char *passphrase);
 187 int rsakey_encrypted(char *filename, char **comment);
 188
 189 int saversakey(char *filename, struct RSAKey *key, struct RSAAux *aux,
 190                char *passphrase);
 191
 192 void des3_decrypt_pubkey(unsigned char *key,
 193                          unsigned char *blk, int len);
 194 void des3_encrypt_pubkey(unsigned char *key,
 195                          unsigned char *blk, int len);
 196
 197 /*
 198  * For progress updates in the key generation utility.
 199  */
 200 typedef void (*progfn_t)(void *param, int phase, int progress);
 201
 202 int rsa_generate(struct RSAKey *key, struct RSAAux *aux, int bits,
 203                  progfn_t pfn, void *pfnparam);
 204 Bignum primegen(int bits, int modulus, int residue,
 205                 int phase, progfn_t pfn, void *pfnparam);
 206
 207 /*
 208  * zlib compression.
 209  */
 210 void zlib_compress_init(void);
 211 void zlib_decompress_init(void);
 212 int zlib_compress_block(unsigned char *block, int len,
 213                         unsigned char **outblock, int *outlen);
 214 int zlib_decompress_block(unsigned char *block, int len,
 215                           unsigned char **outblock, int *outlen);