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 int makekey(unsigned char *data, struct RSAKey *result,
  43             unsigned char **keystr, int order);
  44 int makeprivate(unsigned char *data, struct RSAKey *result);
  45 void rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
  46 Bignum rsadecrypt(Bignum input, struct RSAKey *key);
  47 void rsasign(unsigned char *data, int length, struct RSAKey *key);
  48 void rsasanitise(struct RSAKey *key);
  49 int rsastr_len(struct RSAKey *key);
  50 void rsastr_fmt(char *str, struct RSAKey *key);
  51 void freersakey(struct RSAKey *key);
  52
  53 typedef unsigned int word32;
  54 typedef unsigned int uint32;
  55
  56 unsigned long crc32(const void *s, size_t len);
  57
  58 typedef struct {
  59     uint32 h[4];
  60 } MD5_Core_State;
  61
  62 struct MD5Context {
  63 #ifdef MSCRYPTOAPI
  64     unsigned long hHash;
  65 #else
  66     MD5_Core_State core;
  67     unsigned char block[64];
  68     int blkused;
  69     uint32 lenhi, lenlo;
  70 #endif
  71 };
  72
  73 void MD5Init(struct MD5Context *context);
  74 void MD5Update(struct MD5Context *context, unsigned char const *buf,
  75                unsigned len);
  76 void MD5Final(unsigned char digest[16], struct MD5Context *context);
  77
  78 typedef struct {
  79     uint32 h[5];
  80     unsigned char block[64];
  81     int blkused;
  82     uint32 lenhi, lenlo;
  83 } SHA_State;
  84
  85 void SHA_Init(SHA_State *s);
  86 void SHA_Bytes(SHA_State *s, void *p, int len);
  87 void SHA_Final(SHA_State *s, unsigned char *output);
  88 void SHA_Simple(void *p, int len, unsigned char *output);
  89
  90 struct ssh_cipher {
  91     void (*sesskey)(unsigned char *key);   /* for ssh 1 */
  92     void (*setcsiv)(unsigned char *key);   /* for ssh 2 */
  93     void (*setcskey)(unsigned char *key);   /* for ssh 2 */
  94     void (*setsciv)(unsigned char *key);   /* for ssh 2 */
  95     void (*setsckey)(unsigned char *key);   /* for ssh 2 */
  96     void (*encrypt)(unsigned char *blk, int len);
  97     void (*decrypt)(unsigned char *blk, int len);
  98     char *name;
  99     int blksize;
 100 };
 101
 102 struct ssh_mac {
 103     void (*setcskey)(unsigned char *key);
 104     void (*setsckey)(unsigned char *key);
 105     void (*generate)(unsigned char *blk, int len, unsigned long seq);
 106     int (*verify)(unsigned char *blk, int len, unsigned long seq);
 107     char *name;
 108     int len;
 109 };
 110
 111 struct ssh_kex {
 112     /*
 113      * Plugging in another KEX algorithm requires structural chaos,
 114      * so it's hard to abstract them into nice little structures
 115      * like this. Hence, for the moment, this is just a
 116      * placeholder. I claim justification in the fact that OpenSSH
 117      * does this too :-)
 118      */
 119     char *name;
 120 };
 121
 122 struct ssh_hostkey {
 123     void (*setkey)(char *data, int len);
 124     char *(*fmtkey)(void);
 125     int (*verifysig)(char *sig, int siglen, char *data, int datalen);
 126     char *name;
 127 };
 128
 129 struct ssh_compress {
 130     char *name;
 131 };
 132
 133 #ifndef MSCRYPTOAPI
 134 void SHATransform(word32 *digest, word32 *data);
 135 #endif
 136
 137 int random_byte(void);
 138 void random_add_noise(void *noise, int length);
 139
 140 void logevent (char *);
 141
 142 Bignum newbn(int length);
 143 Bignum copybn(Bignum b);
 144 void freebn(Bignum b);
 145 void modpow(Bignum base, Bignum exp, Bignum mod, Bignum result);
 146 void modmul(Bignum a, Bignum b, Bignum mod, Bignum result);
 147 void decbn(Bignum n);
 148 extern Bignum Zero, One;
 149 int ssh1_read_bignum(unsigned char *data, Bignum *result);
 150 int ssh1_bignum_bitcount(Bignum bn);
 151 int ssh1_bignum_length(Bignum bn);
 152 int bignum_byte(Bignum bn, int i);
 153 int ssh1_write_bignum(void *data, Bignum bn);
 154
 155 Bignum dh_create_e(void);
 156 Bignum dh_find_K(Bignum f);
 157
 158 int loadrsakey(char *filename, struct RSAKey *key, char *passphrase);
 159 int rsakey_encrypted(char *filename, char **comment);
 160
 161 void des3_decrypt_pubkey(unsigned char *key,
 162                          unsigned char *blk, int len);