putty/ssh.h

#include <string.h>

#define SSH_CIPHER_IDEA		1
#define SSH_CIPHER_DES		2
#define SSH_CIPHER_3DES		3
#define SSH_CIPHER_BLOWFISH	6

struct RSAKey {
    int bits;
    int bytes;
#ifdef MSCRYPTOAPI
    unsigned long exponent;
    unsigned char *modulus;
#else
    void *modulus;
    void *exponent;
#endif
};

int makekey(unsigned char *data, struct RSAKey *result,
	    unsigned char **keystr);
void rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
int rsastr_len(struct RSAKey *key);
void rsastr_fmt(char *str, struct RSAKey *key);

typedef unsigned int word32;
typedef unsigned int uint32;

unsigned long crc32(const void *s, size_t len);

typedef struct {
    uint32 h[4];
} MD5_Core_State;

struct MD5Context {
#ifdef MSCRYPTOAPI
    unsigned long hHash;
#else
    MD5_Core_State core;
    unsigned char block[64];
    int blkused;
    uint32 lenhi, lenlo;
#endif
};

void MD5Init(struct MD5Context *context);
void MD5Update(struct MD5Context *context, unsigned char const *buf,
               unsigned len);
void MD5Final(unsigned char digest[16], struct MD5Context *context);

struct ssh_cipher {
    void (*sesskey)(unsigned char *key);
    void (*encrypt)(unsigned char *blk, int len);
    void (*decrypt)(unsigned char *blk, int len);
};

#ifndef MSCRYPTOAPI
void SHATransform(word32 *digest, word32 *data);
#endif

int random_byte(void);
void random_add_noise(void *noise, int length);

void logevent (char *);

int ssh_compression_init(int);
void ssh_compress(unsigned char *src, unsigned int srclen,
                  unsigned char **dest, unsigned int *destlen);
void ssh_decompress(unsigned char *src, unsigned int srclen,
                    unsigned char **dest, unsigned int *destlen);