[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);
unsigned long crc32_update(unsigned long crc_input, const void *s, size_t len);

/* SSH CRC compensation attack detector */
int detect_attack(unsigned char *buf, uint32 len, unsigned char *IV);

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(void *handle);

#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 *);

/* Allocate and register a new channel for port forwarding */
void *new_sock_channel(void *handle, Socket s);
void ssh_send_port_open(void *handle, 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);

enum {
    SSH_KEYTYPE_UNOPENABLE,
    SSH_KEYTYPE_UNKNOWN,
    SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2,
    SSH_KEYTYPE_OPENSSH, SSH_KEYTYPE_SSHCOM
};
int key_type(char *filename);
char *key_type_to_str(int type);

int import_possible(int type);
int import_target_type(int type);
int import_encrypted(char *filename, int type, char **comment);
int import_ssh1(char *filename, int type, struct RSAKey *key,char *passphrase);
struct ssh2_userkey *import_ssh2(char *filename, int type, char *passphrase);
int export_ssh1(char *filename, int type, struct RSAKey *key,char *passphrase);
int export_ssh2(char *filename, int type,
                struct ssh2_userkey *key, char *passphrase);

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 des3_decrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
			      unsigned char *blk, int len);
void des3_encrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
			      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);
9a3a93a5	75	unsigned long crc32_update(unsigned long crc_input, const void *s, size_t len);
	76
	77	/* SSH CRC compensation attack detector */
	78	int detect_attack(unsigned char buf, uint32 len, unsigned char IV);
374330e2	79
48672163	80	typedef struct {
	81	uint32 h[4];
	82	} MD5_Core_State;
	83
374330e2	84	struct MD5Context {
8f203108	85	#ifdef MSCRYPTOAPI
	86	unsigned long hHash;
	87	#else
48672163	88	MD5_Core_State core;
bb093ca7	89	unsigned char block[64];
48672163	90	int blkused;
48672163	91	uint32 lenhi, lenlo;
8f203108	92	#endif
374330e2	93	};
	94
	95	void MD5Init(struct MD5Context *context);
	96	void MD5Update(struct MD5Context context, unsigned char const buf,
32874aea	97	unsigned len);
374330e2	98	void MD5Final(unsigned char digest[16], struct MD5Context *context);
374330e2	99
e5574168	100	typedef struct {
	101	uint32 h[5];
	102	unsigned char block[64];
	103	int blkused;
	104	uint32 lenhi, lenlo;
	105	} SHA_State;
32874aea	106	void SHA_Init(SHA_State * s);
	107	void SHA_Bytes(SHA_State * s, void *p, int len);
	108	void SHA_Final(SHA_State * s, unsigned char *output);
7cca0d81	109	void SHA_Simple(void p, int len, unsigned char output);
e5574168	110
5c72ca61	111	void hmac_sha1_simple(void key, int keylen, void data, int datalen,
	112	unsigned char *output);
	113
	114	typedef struct {
	115	uint64 h[8];
	116	unsigned char block[128];
	117	int blkused;
	118	uint32 len[4];
	119	} SHA512_State;
	120	void SHA512_Init(SHA512_State * s);
	121	void SHA512_Bytes(SHA512_State * s, const void *p, int len);
	122	void SHA512_Final(SHA512_State * s, unsigned char *output);
	123	void SHA512_Simple(const void p, int len, unsigned char output);
	124
374330e2	125	struct ssh_cipher {
32874aea	126	void (sesskey) (unsigned char key); /* for ssh 1 */
	127	void (encrypt) (unsigned char blk, int len);
	128	void (decrypt) (unsigned char blk, int len);
0a3f1d48	129	int blksize;
	130	};
	131
	132	struct ssh2_cipher {
32874aea	133	void (setcsiv) (unsigned char key); /* for ssh 2 */
	134	void (setcskey) (unsigned char key); /* for ssh 2 */
	135	void (setsciv) (unsigned char key); /* for ssh 2 */
	136	void (setsckey) (unsigned char key); /* for ssh 2 */
	137	void (encrypt) (unsigned char blk, int len);
	138	void (decrypt) (unsigned char blk, int len);
e5574168	139	char *name;
e5574168	140	int blksize;
d2a0e0be	141	int keylen;
e5574168	142	};
e5574168	143
0a3f1d48	144	struct ssh2_ciphers {
0a3f1d48	145	int nciphers;
65a22376	146	const struct ssh2_cipher const list;
0a3f1d48	147	};
0a3f1d48	148
e5574168	149	struct ssh_mac {
32874aea	150	void (setcskey) (unsigned char key);
	151	void (setsckey) (unsigned char key);
	152	void (generate) (unsigned char blk, int len, unsigned long seq);
	153	int (verify) (unsigned char blk, int len, unsigned long seq);
e5574168	154	char *name;
	155	int len;
	156	};
	157
	158	struct ssh_kex {
7cca0d81	159	/*
	160	* Plugging in another KEX algorithm requires structural chaos,
	161	* so it's hard to abstract them into nice little structures
	162	* like this. Hence, for the moment, this is just a
	163	* placeholder. I claim justification in the fact that OpenSSH
	164	* does this too :-)
	165	*/
e5574168	166	char *name;
	167	};
	168
e055a386	169	struct ssh_signkey {
32874aea	170	void (newkey) (char *data, int len);
	171	void (freekey) (void key);
	172	char (fmtkey) (void *key);
	173	unsigned char (public_blob) (void key, int len);
	174	unsigned char (private_blob) (void key, int len);
	175	void (createkey) (unsigned char *pub_blob, int pub_len,
	176	unsigned char *priv_blob, int priv_len);
	177	void (openssh_createkey) (unsigned char *blob, int len);
	178	int (openssh_fmtkey) (void key, unsigned char *blob, int len);
	179	char (fingerprint) (void *key);
	180	int (verifysig) (void key, char *sig, int siglen,
	181	char *data, int datalen);
	182	unsigned char (sign) (void key, char data, int datalen,
	183	int *siglen);
e5574168	184	char *name;
32874aea	185	char keytype; / for host key cache */
e5574168	186	};
	187
	188	struct ssh_compress {
	189	char *name;
32874aea	190	void (*compress_init) (void);
	191	int (compress) (unsigned char block, int len,
	192	unsigned char *outblock, int outlen);
	193	void (*decompress_init) (void);
	194	int (decompress) (unsigned char block, int len,
	195	unsigned char *outblock, int outlen);
	196	int (*disable_compression) (void);
374330e2	197	};
374330e2	198
65a22376	199	struct ssh2_userkey {
	200	const struct ssh_signkey alg; / the key algorithm */
	201	void data; / the key data */
	202	char comment; / the key comment */
	203	};
	204
	205	extern const struct ssh_cipher ssh_3des;
	206	extern const struct ssh_cipher ssh_des;
	207	extern const struct ssh_cipher ssh_blowfish_ssh1;
	208	extern const struct ssh2_ciphers ssh2_3des;
0d7c43a6	209	extern const struct ssh2_ciphers ssh2_des;
65a22376	210	extern const struct ssh2_ciphers ssh2_aes;
	211	extern const struct ssh2_ciphers ssh2_blowfish;
	212	extern const struct ssh_kex ssh_diffiehellman;
	213	extern const struct ssh_kex ssh_diffiehellman_gex;
	214	extern const struct ssh_signkey ssh_dss;
	215	extern const struct ssh_signkey ssh_rsa;
	216	extern const struct ssh_mac ssh_md5;
	217	extern const struct ssh_mac ssh_sha1;
	218	extern const struct ssh_mac ssh_sha1_buggy;
	219
900a4ee6	220	/*
	221	* PuTTY version number formatted as an SSH version string.
	222	*/
	223	extern char sshver[];
	224
fd5e5847	225	/*
	226	* Gross hack: pscp will try to start SFTP but fall back to scp1 if
	227	* that fails. This variable is the means by which scp.c can reach
	228	* into the SSH code and find out which one it got.
	229	*/
51470298	230	extern int ssh_fallback_cmd(void *handle);
fd5e5847	231
8f203108	232	#ifndef MSCRYPTOAPI
32874aea	233	void SHATransform(word32 * digest, word32 * data);
8f203108	234	#endif
374330e2	235
	236	int random_byte(void);
	237	void random_add_noise(void *noise, int length);
6e522441	238	void random_add_heavynoise(void *noise, int length);
c5e9c988	239
32874aea	240	void logevent(char *);
51470298	241
	242	/* Allocate and register a new channel for port forwarding */
	243	void new_sock_channel(void handle, Socket s);
	244	void ssh_send_port_open(void handle, void channel,
	245	char hostname, int port, char org);
e5574168	246
7cca0d81	247	Bignum copybn(Bignum b);
3709bfe9	248	Bignum bn_power_2(int n);
3709bfe9	249	void bn_restore_invariant(Bignum b);
5c72ca61	250	Bignum bignum_from_long(unsigned long n);
e5574168	251	void freebn(Bignum b);
59600f67	252	Bignum modpow(Bignum base, Bignum exp, Bignum mod);
59600f67	253	Bignum modmul(Bignum a, Bignum b, Bignum mod);
7cca0d81	254	void decbn(Bignum n);
7cca0d81	255	extern Bignum Zero, One;
3709bfe9	256	Bignum bignum_from_bytes(unsigned char *data, int nbytes);
32874aea	257	int ssh1_read_bignum(unsigned char data, Bignum result);
ddecd643	258	int bignum_bitcount(Bignum bn);
5c58ad2d	259	int ssh1_bignum_length(Bignum bn);
260f3dec	260	int ssh2_bignum_length(Bignum bn);
5c58ad2d	261	int bignum_byte(Bignum bn, int i);
9400cf6f	262	int bignum_bit(Bignum bn, int i);
9400cf6f	263	void bignum_set_bit(Bignum bn, int i, int value);
5c58ad2d	264	int ssh1_write_bignum(void *data, Bignum bn);
9400cf6f	265	Bignum biggcd(Bignum a, Bignum b);
	266	unsigned short bignum_mod_short(Bignum number, unsigned short modulus);
	267	Bignum bignum_add_long(Bignum number, unsigned long addend);
	268	Bignum bigmul(Bignum a, Bignum b);
5c72ca61	269	Bignum bigmuladd(Bignum a, Bignum b, Bignum addend);
	270	Bignum bigdiv(Bignum a, Bignum b);
	271	Bignum bigmod(Bignum a, Bignum b);
9400cf6f	272	Bignum modinv(Bignum number, Bignum modulus);
3709bfe9	273	Bignum bignum_bitmask(Bignum number);
9400cf6f	274	Bignum bignum_rshift(Bignum number, int shift);
8c3cd914	275	int bignum_cmp(Bignum a, Bignum b);
6e522441	276	char *bignum_decimal(Bignum x);
e5574168	277
3709bfe9	278	void dh_setup_group1(void);
a92dd380	279	void dh_setup_group(Bignum pval, Bignum gval);
3709bfe9	280	void dh_cleanup(void);
7bd5a860	281	Bignum dh_create_e(int nbits);
e5574168	282	Bignum dh_find_K(Bignum f);
7cca0d81	283
65a22376	284	int loadrsakey(char filename, struct RSAKey key, char *passphrase);
a52f067e	285	int rsakey_encrypted(char filename, char *comment);
3f2d010c	286	int rsakey_pubblob(char filename, void blob, int bloblen);
7cca0d81	287
65a22376	288	int saversakey(char filename, struct RSAKey key, char *passphrase);
	289
	290	void base64_encode_atom(unsigned char data, int n, char out);
	291
	292	/* ssh2_load_userkey can return this as an error */
	293	extern struct ssh2_userkey ssh2_wrong_passphrase;
	294	#define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)
	295
	296	int ssh2_userkey_encrypted(char filename, char *comment);
	297	struct ssh2_userkey ssh2_load_userkey(char filename, char *passphrase);
32874aea	298	char ssh2_userkey_loadpub(char filename, char **algorithm,
	299	int *pub_blob_len);
	300	int ssh2_save_userkey(char filename, struct ssh2_userkey key,
	301	char *passphrase);
65a22376	302
231ee168	303	enum {
	304	SSH_KEYTYPE_UNOPENABLE,
	305	SSH_KEYTYPE_UNKNOWN,
	306	SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2,
	307	SSH_KEYTYPE_OPENSSH, SSH_KEYTYPE_SSHCOM
	308	};
	309	int key_type(char *filename);
	310	char *key_type_to_str(int type);
6e522441	311
9dda6459	312	int import_possible(int type);
	313	int import_target_type(int type);
	314	int import_encrypted(char filename, int type, char *comment);
	315	int import_ssh1(char filename, int type, struct RSAKey key,char *passphrase);
	316	struct ssh2_userkey import_ssh2(char filename, int type, char *passphrase);
4801c01c	317	int export_ssh1(char filename, int type, struct RSAKey key,char *passphrase);
	318	int export_ssh2(char *filename, int type,
	319	struct ssh2_userkey key, char passphrase);
9dda6459	320
65a22376	321	void des3_decrypt_pubkey(unsigned char key, unsigned char blk, int len);
65a22376	322	void des3_encrypt_pubkey(unsigned char key, unsigned char blk, int len);
9dda6459	323	void des3_decrypt_pubkey_ossh(unsigned char key, unsigned char iv,
	324	unsigned char *blk, int len);
	325	void des3_encrypt_pubkey_ossh(unsigned char key, unsigned char iv,
	326	unsigned char *blk, int len);
32874aea	327	void aes256_encrypt_pubkey(unsigned char key, unsigned char blk,
	328	int len);
	329	void aes256_decrypt_pubkey(unsigned char key, unsigned char blk,
	330	int len);
9400cf6f	331
	332	/*
	333	* For progress updates in the key generation utility.
	334	*/
7c7f6893	335	#define PROGFN_INITIALISE 1
	336	#define PROGFN_LIN_PHASE 2
	337	#define PROGFN_EXP_PHASE 3
	338	#define PROGFN_PHASE_EXTENT 4
	339	#define PROGFN_READY 5
	340	#define PROGFN_PROGRESS 6
5c72ca61	341	typedef void (progfn_t) (void param, int action, int phase, int progress);
9400cf6f	342
32874aea	343	int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
32874aea	344	void *pfnparam);
5c72ca61	345	int dsa_generate(struct dss_key *key, int bits, progfn_t pfn,
	346	void *pfnparam);
	347	Bignum primegen(int bits, int modulus, int residue, Bignum factor,
	348	int phase, progfn_t pfn, void *pfnparam);
4ba9b64b	349
d74d141c	350
4ba9b64b	351	/*
	352	* zlib compression.
	353	*/
	354	void zlib_compress_init(void);
	355	void zlib_decompress_init(void);
	356	int zlib_compress_block(unsigned char *block, int len,
	357	unsigned char *outblock, int outlen);
	358	int zlib_decompress_block(unsigned char *block, int len,
	359	unsigned char *outblock, int outlen);
1983e559	360
	361	/*
	362	* SSH1 agent messages.
	363	*/
	364	#define SSH1_AGENTC_REQUEST_RSA_IDENTITIES 1
	365	#define SSH1_AGENT_RSA_IDENTITIES_ANSWER 2
	366	#define SSH1_AGENTC_RSA_CHALLENGE 3
	367	#define SSH1_AGENT_RSA_RESPONSE 4
	368	#define SSH1_AGENTC_ADD_RSA_IDENTITY 7
	369	#define SSH1_AGENTC_REMOVE_RSA_IDENTITY 8
32874aea	370	#define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */
1983e559	371
	372	/*
	373	* Messages common to SSH1 and OpenSSH's SSH2.
	374	*/
	375	#define SSH_AGENT_FAILURE 5
	376	#define SSH_AGENT_SUCCESS 6
	377
	378	/*
	379	* OpenSSH's SSH2 agent messages.
	380	*/
	381	#define SSH2_AGENTC_REQUEST_IDENTITIES 11
	382	#define SSH2_AGENT_IDENTITIES_ANSWER 12
	383	#define SSH2_AGENTC_SIGN_REQUEST 13
	384	#define SSH2_AGENT_SIGN_RESPONSE 14
	385	#define SSH2_AGENTC_ADD_IDENTITY 17
	386	#define SSH2_AGENTC_REMOVE_IDENTITY 18
	387	#define SSH2_AGENTC_REMOVE_ALL_IDENTITIES 19
7bedb13c	388
	389	/*
	390	* Need this to warn about support for the original SSH2 keyfile
	391	* format.
	392	*/
	393	void old_keyfile_warning(void);