[u/mdw/putty] / ssh.h

#include <string.h>

#include "puttymem.h"
#include "network.h"
#include "int64.h"

struct ssh_channel;

extern void sshfwd_close(struct ssh_channel *c);
extern int sshfwd_write(struct ssh_channel *c, char *, int);
extern void sshfwd_unthrottle(struct ssh_channel *c, int bufsize);

/*
 * Useful thing.
 */
#ifndef lenof
#define lenof(x) ( (sizeof((x))) / (sizeof(*(x))))
#endif

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

#ifdef MSCRYPTOAPI
#define APIEXTRA 8
#else
#define APIEXTRA 0
#endif

#ifndef BIGNUM_INTERNAL
typedef void *Bignum;
#endif

struct RSAKey {
    int bits;
    int bytes;
#ifdef MSCRYPTOAPI
    unsigned long exponent;
    unsigned char *modulus;
#else
    Bignum modulus;
    Bignum exponent;
    Bignum private_exponent;
    Bignum p;
    Bignum q;
    Bignum iqmp;
#endif
    char *comment;
};

struct dss_key {
    Bignum p, q, g, y, x;
};

int makekey(unsigned char *data, struct RSAKey *result,
	    unsigned char **keystr, int order);
int makeprivate(unsigned char *data, struct RSAKey *result);
void rsaencrypt(unsigned char *data, int length, struct RSAKey *key);
Bignum rsadecrypt(Bignum input, struct RSAKey *key);
void rsasign(unsigned char *data, int length, struct RSAKey *key);
void rsasanitise(struct RSAKey *key);
int rsastr_len(struct RSAKey *key);
void rsastr_fmt(char *str, struct RSAKey *key);
void rsa_fingerprint(char *str, int len, struct RSAKey *key);
int rsa_verify(struct RSAKey *key);
unsigned char *rsa_public_blob(struct RSAKey *key, int *len);
int rsa_public_blob_len(void *data);
void freersakey(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);

typedef struct {
    uint32 h[5];
    unsigned char block[64];
    int blkused;
    uint32 lenhi, lenlo;
} SHA_State;
void SHA_Init(SHA_State * s);
void SHA_Bytes(SHA_State * s, void *p, int len);
void SHA_Final(SHA_State * s, unsigned char *output);
void SHA_Simple(void *p, int len, unsigned char *output);

void hmac_sha1_simple(void *key, int keylen, void *data, int datalen,
		      unsigned char *output);

typedef struct {
    uint64 h[8];
    unsigned char block[128];
    int blkused;
    uint32 len[4];
} SHA512_State;
void SHA512_Init(SHA512_State * s);
void SHA512_Bytes(SHA512_State * s, const void *p, int len);
void SHA512_Final(SHA512_State * s, unsigned char *output);
void SHA512_Simple(const void *p, int len, unsigned char *output);

struct ssh_cipher {
    void (*sesskey) (unsigned char *key);	/* for ssh 1 */
    void (*encrypt) (unsigned char *blk, int len);
    void (*decrypt) (unsigned char *blk, int len);
    int blksize;
};

struct ssh2_cipher {
    void (*setcsiv) (unsigned char *key);	/* for ssh 2 */
    void (*setcskey) (unsigned char *key);	/* for ssh 2 */
    void (*setsciv) (unsigned char *key);	/* for ssh 2 */
    void (*setsckey) (unsigned char *key);	/* for ssh 2 */
    void (*encrypt) (unsigned char *blk, int len);
    void (*decrypt) (unsigned char *blk, int len);
    char *name;
    int blksize;
    int keylen;
};

struct ssh2_ciphers {
    int nciphers;
    const struct ssh2_cipher *const *list;
};

struct ssh_mac {
    void (*setcskey) (unsigned char *key);
    void (*setsckey) (unsigned char *key);
    void (*generate) (unsigned char *blk, int len, unsigned long seq);
    int (*verify) (unsigned char *blk, int len, unsigned long seq);
    char *name;
    int len;
};

struct ssh_kex {
    /*
     * Plugging in another KEX algorithm requires structural chaos,
     * so it's hard to abstract them into nice little structures
     * like this. Hence, for the moment, this is just a
     * placeholder. I claim justification in the fact that OpenSSH
     * does this too :-)
     */
    char *name;
};

struct ssh_signkey {
    void *(*newkey) (char *data, int len);
    void (*freekey) (void *key);
    char *(*fmtkey) (void *key);
    unsigned char *(*public_blob) (void *key, int *len);
    unsigned char *(*private_blob) (void *key, int *len);
    void *(*createkey) (unsigned char *pub_blob, int pub_len,
			unsigned char *priv_blob, int priv_len);
    void *(*openssh_createkey) (unsigned char **blob, int *len);
    int (*openssh_fmtkey) (void *key, unsigned char *blob, int len);
    char *(*fingerprint) (void *key);
    int (*verifysig) (void *key, char *sig, int siglen,
		      char *data, int datalen);
    unsigned char *(*sign) (void *key, char *data, int datalen,
			    int *siglen);
    char *name;
    char *keytype;		       /* for host key cache */
};

struct ssh_compress {
    char *name;
    void (*compress_init) (void);
    int (*compress) (unsigned char *block, int len,
		     unsigned char **outblock, int *outlen);
    void (*decompress_init) (void);
    int (*decompress) (unsigned char *block, int len,
		       unsigned char **outblock, int *outlen);
    int (*disable_compression) (void);
};

struct ssh2_userkey {
    const struct ssh_signkey *alg;     /* the key algorithm */
    void *data;			       /* the key data */
    char *comment;		       /* the key comment */
};

extern const struct ssh_cipher ssh_3des;
extern const struct ssh_cipher ssh_des;
extern const struct ssh_cipher ssh_blowfish_ssh1;
extern const struct ssh2_ciphers ssh2_3des;
extern const struct ssh2_ciphers ssh2_des;
extern const struct ssh2_ciphers ssh2_aes;
extern const struct ssh2_ciphers ssh2_blowfish;
extern const struct ssh_kex ssh_diffiehellman;
extern const struct ssh_kex ssh_diffiehellman_gex;
extern const struct ssh_signkey ssh_dss;
extern const struct ssh_signkey ssh_rsa;
extern const struct ssh_mac ssh_md5;
extern const struct ssh_mac ssh_sha1;
extern const struct ssh_mac ssh_sha1_buggy;

/*
 * PuTTY version number formatted as an SSH version string. 
 */
extern char sshver[];

/*
 * Gross hack: pscp will try to start SFTP but fall back to scp1 if
 * that fails. This variable is the means by which scp.c can reach
 * into the SSH code and find out which one it got.
 */
extern int ssh_fallback_cmd;

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

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

void logevent(char *);
void *new_sock_channel(Socket s); // allocates and register a new channel for port forwarding
void ssh_send_port_open(void *channel, char *hostname, int port, char *org);

Bignum copybn(Bignum b);
Bignum bn_power_2(int n);
void bn_restore_invariant(Bignum b);
Bignum bignum_from_long(unsigned long n);
void freebn(Bignum b);
Bignum modpow(Bignum base, Bignum exp, Bignum mod);
Bignum modmul(Bignum a, Bignum b, Bignum mod);
void decbn(Bignum n);
extern Bignum Zero, One;
Bignum bignum_from_bytes(unsigned char *data, int nbytes);
int ssh1_read_bignum(unsigned char *data, Bignum * result);
int bignum_bitcount(Bignum bn);
int ssh1_bignum_length(Bignum bn);
int ssh2_bignum_length(Bignum bn);
int bignum_byte(Bignum bn, int i);
int bignum_bit(Bignum bn, int i);
void bignum_set_bit(Bignum bn, int i, int value);
int ssh1_write_bignum(void *data, Bignum bn);
Bignum biggcd(Bignum a, Bignum b);
unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
Bignum bignum_add_long(Bignum number, unsigned long addend);
Bignum bigmul(Bignum a, Bignum b);
Bignum bigmuladd(Bignum a, Bignum b, Bignum addend);
Bignum bigdiv(Bignum a, Bignum b);
Bignum bigmod(Bignum a, Bignum b);
Bignum modinv(Bignum number, Bignum modulus);
Bignum bignum_bitmask(Bignum number);
Bignum bignum_rshift(Bignum number, int shift);
int bignum_cmp(Bignum a, Bignum b);
char *bignum_decimal(Bignum x);

void dh_setup_group1(void);
void dh_setup_group(Bignum pval, Bignum gval);
void dh_cleanup(void);
Bignum dh_create_e(int nbits);
Bignum dh_find_K(Bignum f);

int loadrsakey(char *filename, struct RSAKey *key, char *passphrase);
int rsakey_encrypted(char *filename, char **comment);
int rsakey_pubblob(char *filename, void **blob, int *bloblen);

int saversakey(char *filename, struct RSAKey *key, char *passphrase);

void base64_encode_atom(unsigned char *data, int n, char *out);

/* ssh2_load_userkey can return this as an error */
extern struct ssh2_userkey ssh2_wrong_passphrase;
#define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)

int ssh2_userkey_encrypted(char *filename, char **comment);
struct ssh2_userkey *ssh2_load_userkey(char *filename, char *passphrase);
char *ssh2_userkey_loadpub(char *filename, char **algorithm,
			   int *pub_blob_len);
int ssh2_save_userkey(char *filename, struct ssh2_userkey *key,
		      char *passphrase);

int keyfile_version(char *filename);

void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk,
			   int len);
void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk,
			   int len);

/*
 * For progress updates in the key generation utility.
 */
#define PROGFN_INITIALISE 1
#define PROGFN_LIN_PHASE 2
#define PROGFN_EXP_PHASE 3
#define PROGFN_PHASE_EXTENT 4
#define PROGFN_READY 5
#define PROGFN_PROGRESS 6
typedef void (*progfn_t) (void *param, int action, int phase, int progress);

int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
		 void *pfnparam);
int dsa_generate(struct dss_key *key, int bits, progfn_t pfn,
		 void *pfnparam);
Bignum primegen(int bits, int modulus, int residue, Bignum factor,
		int phase, progfn_t pfn, void *pfnparam);


/*
 * zlib compression.
 */
void zlib_compress_init(void);
void zlib_decompress_init(void);
int zlib_compress_block(unsigned char *block, int len,
			unsigned char **outblock, int *outlen);
int zlib_decompress_block(unsigned char *block, int len,
			  unsigned char **outblock, int *outlen);

/*
 * SSH1 agent messages.
 */
#define SSH1_AGENTC_REQUEST_RSA_IDENTITIES    1
#define SSH1_AGENT_RSA_IDENTITIES_ANSWER      2
#define SSH1_AGENTC_RSA_CHALLENGE             3
#define SSH1_AGENT_RSA_RESPONSE               4
#define SSH1_AGENTC_ADD_RSA_IDENTITY          7
#define SSH1_AGENTC_REMOVE_RSA_IDENTITY       8
#define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9	/* openssh private? */

/*
 * Messages common to SSH1 and OpenSSH's SSH2.
 */
#define SSH_AGENT_FAILURE                    5
#define SSH_AGENT_SUCCESS                    6

/*
 * OpenSSH's SSH2 agent messages.
 */
#define SSH2_AGENTC_REQUEST_IDENTITIES          11
#define SSH2_AGENT_IDENTITIES_ANSWER            12
#define SSH2_AGENTC_SIGN_REQUEST                13
#define SSH2_AGENT_SIGN_RESPONSE                14
#define SSH2_AGENTC_ADD_IDENTITY                17
#define SSH2_AGENTC_REMOVE_IDENTITY             18
#define SSH2_AGENTC_REMOVE_ALL_IDENTITIES       19

/*
 * Need this to warn about support for the original SSH2 keyfile
 * format.
 */
void old_keyfile_warning(void);
Commit	Line	Data
37508af4	1	#include <string.h>
37508af4	2
dcbde236	3	#include "puttymem.h"
d74d141c	4	#include "network.h"
5c72ca61	5	#include "int64.h"
dcbde236	6
2871113a	7	struct ssh_channel;
2871113a	8
5471d09a	9	extern void sshfwd_close(struct ssh_channel *c);
	10	extern int sshfwd_write(struct ssh_channel c, char , int);
	11	extern void sshfwd_unthrottle(struct ssh_channel *c, int bufsize);
	12
e5574168	13	/*
	14	* Useful thing.
	15	*/
	16	#ifndef lenof
	17	#define lenof(x) ( (sizeof((x))) / (sizeof(*(x))))
	18	#endif
	19
bea1ef5f	20	#define SSH_CIPHER_IDEA 1
9697bfd2	21	#define SSH_CIPHER_DES 2
bea1ef5f	22	#define SSH_CIPHER_3DES 3
	23	#define SSH_CIPHER_BLOWFISH 6
	24
e5574168	25	#ifdef MSCRYPTOAPI
	26	#define APIEXTRA 8
	27	#else
	28	#define APIEXTRA 0
	29	#endif
	30
3709bfe9	31	#ifndef BIGNUM_INTERNAL
	32	typedef void *Bignum;
	33	#endif
7cca0d81	34
374330e2	35	struct RSAKey {
	36	int bits;
	37	int bytes;
8f203108	38	#ifdef MSCRYPTOAPI
	39	unsigned long exponent;
	40	unsigned char *modulus;
	41	#else
7cca0d81	42	Bignum modulus;
	43	Bignum exponent;
	44	Bignum private_exponent;
9400cf6f	45	Bignum p;
	46	Bignum q;
	47	Bignum iqmp;
65a22376	48	#endif
65a22376	49	char *comment;
9400cf6f	50	};
9400cf6f	51
5c72ca61	52	struct dss_key {
	53	Bignum p, q, g, y, x;
	54	};
	55
374330e2	56	int makekey(unsigned char data, struct RSAKey result,
7cca0d81	57	unsigned char **keystr, int order);
7cca0d81	58	int makeprivate(unsigned char data, struct RSAKey result);
374330e2	59	void rsaencrypt(unsigned char data, int length, struct RSAKey key);
7cca0d81	60	Bignum rsadecrypt(Bignum input, struct RSAKey *key);
	61	void rsasign(unsigned char data, int length, struct RSAKey key);
	62	void rsasanitise(struct RSAKey *key);
374330e2	63	int rsastr_len(struct RSAKey *key);
374330e2	64	void rsastr_fmt(char str, struct RSAKey key);
1c2a93c4	65	void rsa_fingerprint(char str, int len, struct RSAKey key);
014970c8	66	int rsa_verify(struct RSAKey *key);
3f2d010c	67	unsigned char rsa_public_blob(struct RSAKey key, int *len);
3f2d010c	68	int rsa_public_blob_len(void *data);
5c58ad2d	69	void freersakey(struct RSAKey *key);
374330e2	70
	71	typedef unsigned int word32;
	72	typedef unsigned int uint32;
	73
8160fbfc	74	unsigned long crc32(const void *s, size_t len);
374330e2	75
48672163	76	typedef struct {
	77	uint32 h[4];
	78	} MD5_Core_State;
	79
374330e2	80	struct MD5Context {
8f203108	81	#ifdef MSCRYPTOAPI
	82	unsigned long hHash;
	83	#else
48672163	84	MD5_Core_State core;
bb093ca7	85	unsigned char block[64];
48672163	86	int blkused;
48672163	87	uint32 lenhi, lenlo;
8f203108	88	#endif
374330e2	89	};
	90
	91	void MD5Init(struct MD5Context *context);
	92	void MD5Update(struct MD5Context context, unsigned char const buf,
32874aea	93	unsigned len);
374330e2	94	void MD5Final(unsigned char digest[16], struct MD5Context *context);
374330e2	95
e5574168	96	typedef struct {
	97	uint32 h[5];
	98	unsigned char block[64];
	99	int blkused;
	100	uint32 lenhi, lenlo;
	101	} SHA_State;
32874aea	102	void SHA_Init(SHA_State * s);
	103	void SHA_Bytes(SHA_State * s, void *p, int len);
	104	void SHA_Final(SHA_State * s, unsigned char *output);
7cca0d81	105	void SHA_Simple(void p, int len, unsigned char output);
e5574168	106
5c72ca61	107	void hmac_sha1_simple(void key, int keylen, void data, int datalen,
	108	unsigned char *output);
	109
	110	typedef struct {
	111	uint64 h[8];
	112	unsigned char block[128];
	113	int blkused;
	114	uint32 len[4];
	115	} SHA512_State;
	116	void SHA512_Init(SHA512_State * s);
	117	void SHA512_Bytes(SHA512_State * s, const void *p, int len);
	118	void SHA512_Final(SHA512_State * s, unsigned char *output);
	119	void SHA512_Simple(const void p, int len, unsigned char output);
	120
374330e2	121	struct ssh_cipher {
32874aea	122	void (sesskey) (unsigned char key); /* for ssh 1 */
	123	void (encrypt) (unsigned char blk, int len);
	124	void (decrypt) (unsigned char blk, int len);
0a3f1d48	125	int blksize;
	126	};
	127
	128	struct ssh2_cipher {
32874aea	129	void (setcsiv) (unsigned char key); /* for ssh 2 */
	130	void (setcskey) (unsigned char key); /* for ssh 2 */
	131	void (setsciv) (unsigned char key); /* for ssh 2 */
	132	void (setsckey) (unsigned char key); /* for ssh 2 */
	133	void (encrypt) (unsigned char blk, int len);
	134	void (decrypt) (unsigned char blk, int len);
e5574168	135	char *name;
e5574168	136	int blksize;
d2a0e0be	137	int keylen;
e5574168	138	};
e5574168	139
0a3f1d48	140	struct ssh2_ciphers {
0a3f1d48	141	int nciphers;
65a22376	142	const struct ssh2_cipher const list;
0a3f1d48	143	};
0a3f1d48	144
e5574168	145	struct ssh_mac {
32874aea	146	void (setcskey) (unsigned char key);
	147	void (setsckey) (unsigned char key);
	148	void (generate) (unsigned char blk, int len, unsigned long seq);
	149	int (verify) (unsigned char blk, int len, unsigned long seq);
e5574168	150	char *name;
	151	int len;
	152	};
	153
	154	struct ssh_kex {
7cca0d81	155	/*
	156	* Plugging in another KEX algorithm requires structural chaos,
	157	* so it's hard to abstract them into nice little structures
	158	* like this. Hence, for the moment, this is just a
	159	* placeholder. I claim justification in the fact that OpenSSH
	160	* does this too :-)
	161	*/
e5574168	162	char *name;
	163	};
	164
e055a386	165	struct ssh_signkey {
32874aea	166	void (newkey) (char *data, int len);
	167	void (freekey) (void key);
	168	char (fmtkey) (void *key);
	169	unsigned char (public_blob) (void key, int len);
	170	unsigned char (private_blob) (void key, int len);
	171	void (createkey) (unsigned char *pub_blob, int pub_len,
	172	unsigned char *priv_blob, int priv_len);
	173	void (openssh_createkey) (unsigned char *blob, int len);
	174	int (openssh_fmtkey) (void key, unsigned char *blob, int len);
	175	char (fingerprint) (void *key);
	176	int (verifysig) (void key, char *sig, int siglen,
	177	char *data, int datalen);
	178	unsigned char (sign) (void key, char data, int datalen,
	179	int *siglen);
e5574168	180	char *name;
32874aea	181	char keytype; / for host key cache */
e5574168	182	};
	183
	184	struct ssh_compress {
	185	char *name;
32874aea	186	void (*compress_init) (void);
	187	int (compress) (unsigned char block, int len,
	188	unsigned char *outblock, int outlen);
	189	void (*decompress_init) (void);
	190	int (decompress) (unsigned char block, int len,
	191	unsigned char *outblock, int outlen);
	192	int (*disable_compression) (void);
374330e2	193	};
374330e2	194
65a22376	195	struct ssh2_userkey {
	196	const struct ssh_signkey alg; / the key algorithm */
	197	void data; / the key data */
	198	char comment; / the key comment */
	199	};
	200
	201	extern const struct ssh_cipher ssh_3des;
	202	extern const struct ssh_cipher ssh_des;
	203	extern const struct ssh_cipher ssh_blowfish_ssh1;
	204	extern const struct ssh2_ciphers ssh2_3des;
0d7c43a6	205	extern const struct ssh2_ciphers ssh2_des;
65a22376	206	extern const struct ssh2_ciphers ssh2_aes;
	207	extern const struct ssh2_ciphers ssh2_blowfish;
	208	extern const struct ssh_kex ssh_diffiehellman;
	209	extern const struct ssh_kex ssh_diffiehellman_gex;
	210	extern const struct ssh_signkey ssh_dss;
	211	extern const struct ssh_signkey ssh_rsa;
	212	extern const struct ssh_mac ssh_md5;
	213	extern const struct ssh_mac ssh_sha1;
	214	extern const struct ssh_mac ssh_sha1_buggy;
	215
900a4ee6	216	/*
	217	* PuTTY version number formatted as an SSH version string.
	218	*/
	219	extern char sshver[];
	220
fd5e5847	221	/*
	222	* Gross hack: pscp will try to start SFTP but fall back to scp1 if
	223	* that fails. This variable is the means by which scp.c can reach
	224	* into the SSH code and find out which one it got.
	225	*/
	226	extern int ssh_fallback_cmd;
	227
8f203108	228	#ifndef MSCRYPTOAPI
32874aea	229	void SHATransform(word32 * digest, word32 * data);
8f203108	230	#endif
374330e2	231
	232	int random_byte(void);
	233	void random_add_noise(void *noise, int length);
6e522441	234	void random_add_heavynoise(void *noise, int length);
c5e9c988	235
32874aea	236	void logevent(char *);
d74d141c	237	void *new_sock_channel(Socket s); // allocates and register a new channel for port forwarding
d74d141c	238	void ssh_send_port_open(void channel, char hostname, int port, char *org);
e5574168	239
7cca0d81	240	Bignum copybn(Bignum b);
3709bfe9	241	Bignum bn_power_2(int n);
3709bfe9	242	void bn_restore_invariant(Bignum b);
5c72ca61	243	Bignum bignum_from_long(unsigned long n);
e5574168	244	void freebn(Bignum b);
59600f67	245	Bignum modpow(Bignum base, Bignum exp, Bignum mod);
59600f67	246	Bignum modmul(Bignum a, Bignum b, Bignum mod);
7cca0d81	247	void decbn(Bignum n);
7cca0d81	248	extern Bignum Zero, One;
3709bfe9	249	Bignum bignum_from_bytes(unsigned char *data, int nbytes);
32874aea	250	int ssh1_read_bignum(unsigned char data, Bignum result);
ddecd643	251	int bignum_bitcount(Bignum bn);
5c58ad2d	252	int ssh1_bignum_length(Bignum bn);
260f3dec	253	int ssh2_bignum_length(Bignum bn);
5c58ad2d	254	int bignum_byte(Bignum bn, int i);
9400cf6f	255	int bignum_bit(Bignum bn, int i);
9400cf6f	256	void bignum_set_bit(Bignum bn, int i, int value);
5c58ad2d	257	int ssh1_write_bignum(void *data, Bignum bn);
9400cf6f	258	Bignum biggcd(Bignum a, Bignum b);
	259	unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
	260	Bignum bignum_add_long(Bignum number, unsigned long addend);
	261	Bignum bigmul(Bignum a, Bignum b);
5c72ca61	262	Bignum bigmuladd(Bignum a, Bignum b, Bignum addend);
	263	Bignum bigdiv(Bignum a, Bignum b);
	264	Bignum bigmod(Bignum a, Bignum b);
9400cf6f	265	Bignum modinv(Bignum number, Bignum modulus);
3709bfe9	266	Bignum bignum_bitmask(Bignum number);
9400cf6f	267	Bignum bignum_rshift(Bignum number, int shift);
8c3cd914	268	int bignum_cmp(Bignum a, Bignum b);
6e522441	269	char *bignum_decimal(Bignum x);
e5574168	270
3709bfe9	271	void dh_setup_group1(void);
a92dd380	272	void dh_setup_group(Bignum pval, Bignum gval);
3709bfe9	273	void dh_cleanup(void);
7bd5a860	274	Bignum dh_create_e(int nbits);
e5574168	275	Bignum dh_find_K(Bignum f);
7cca0d81	276
65a22376	277	int loadrsakey(char filename, struct RSAKey key, char *passphrase);
a52f067e	278	int rsakey_encrypted(char filename, char *comment);
3f2d010c	279	int rsakey_pubblob(char filename, void blob, int bloblen);
7cca0d81	280
65a22376	281	int saversakey(char filename, struct RSAKey key, char *passphrase);
	282
	283	void base64_encode_atom(unsigned char data, int n, char out);
	284
	285	/* ssh2_load_userkey can return this as an error */
	286	extern struct ssh2_userkey ssh2_wrong_passphrase;
	287	#define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)
	288
	289	int ssh2_userkey_encrypted(char filename, char *comment);
	290	struct ssh2_userkey ssh2_load_userkey(char filename, char *passphrase);
32874aea	291	char ssh2_userkey_loadpub(char filename, char **algorithm,
	292	int *pub_blob_len);
	293	int ssh2_save_userkey(char filename, struct ssh2_userkey key,
	294	char *passphrase);
65a22376	295
65a22376	296	int keyfile_version(char *filename);
6e522441	297
65a22376	298	void des3_decrypt_pubkey(unsigned char key, unsigned char blk, int len);
65a22376	299	void des3_encrypt_pubkey(unsigned char key, unsigned char blk, int len);
32874aea	300	void aes256_encrypt_pubkey(unsigned char key, unsigned char blk,
	301	int len);
	302	void aes256_decrypt_pubkey(unsigned char key, unsigned char blk,
	303	int len);
9400cf6f	304
	305	/*
	306	* For progress updates in the key generation utility.
	307	*/
7c7f6893	308	#define PROGFN_INITIALISE 1
	309	#define PROGFN_LIN_PHASE 2
	310	#define PROGFN_EXP_PHASE 3
	311	#define PROGFN_PHASE_EXTENT 4
	312	#define PROGFN_READY 5
	313	#define PROGFN_PROGRESS 6
5c72ca61	314	typedef void (progfn_t) (void param, int action, int phase, int progress);
9400cf6f	315
32874aea	316	int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
32874aea	317	void *pfnparam);
5c72ca61	318	int dsa_generate(struct dss_key *key, int bits, progfn_t pfn,
	319	void *pfnparam);
	320	Bignum primegen(int bits, int modulus, int residue, Bignum factor,
	321	int phase, progfn_t pfn, void *pfnparam);
4ba9b64b	322
d74d141c	323
4ba9b64b	324	/*
	325	* zlib compression.
	326	*/
	327	void zlib_compress_init(void);
	328	void zlib_decompress_init(void);
	329	int zlib_compress_block(unsigned char *block, int len,
	330	unsigned char *outblock, int outlen);
	331	int zlib_decompress_block(unsigned char *block, int len,
	332	unsigned char *outblock, int outlen);
1983e559	333
	334	/*
	335	* SSH1 agent messages.
	336	*/
	337	#define SSH1_AGENTC_REQUEST_RSA_IDENTITIES 1
	338	#define SSH1_AGENT_RSA_IDENTITIES_ANSWER 2
	339	#define SSH1_AGENTC_RSA_CHALLENGE 3
	340	#define SSH1_AGENT_RSA_RESPONSE 4
	341	#define SSH1_AGENTC_ADD_RSA_IDENTITY 7
	342	#define SSH1_AGENTC_REMOVE_RSA_IDENTITY 8
32874aea	343	#define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */
1983e559	344
	345	/*
	346	* Messages common to SSH1 and OpenSSH's SSH2.
	347	*/
	348	#define SSH_AGENT_FAILURE 5
	349	#define SSH_AGENT_SUCCESS 6
	350
	351	/*
	352	* OpenSSH's SSH2 agent messages.
	353	*/
	354	#define SSH2_AGENTC_REQUEST_IDENTITIES 11
	355	#define SSH2_AGENT_IDENTITIES_ANSWER 12
	356	#define SSH2_AGENTC_SIGN_REQUEST 13
	357	#define SSH2_AGENT_SIGN_RESPONSE 14
	358	#define SSH2_AGENTC_ADD_IDENTITY 17
	359	#define SSH2_AGENTC_REMOVE_IDENTITY 18
	360	#define SSH2_AGENTC_REMOVE_ALL_IDENTITIES 19
7bedb13c	361
	362	/*
	363	* Need this to warn about support for the original SSH2 keyfile
	364	* format.
	365	*/
	366	void old_keyfile_warning(void);