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