[openssh.git] / cipher.h

/*
 * 
 * cipher.h
 * 
 * Author: Tatu Ylonen <ylo@cs.hut.fi>
 * 
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *                    All rights reserved
 * 
 * Created: Wed Apr 19 16:50:42 1995 ylo
 * 
 */

/* RCSID("$Id$"); */

#ifndef CIPHER_H
#define CIPHER_H

#include "config.h"

#ifdef HAVE_OPENSSL
#include <openssl/des.h>
#include <openssl/blowfish.h>
#endif
#ifdef HAVE_SSL
#include <ssl/des.h>
#include <ssl/blowfish.h>
#endif

/* Cipher types.  New types can be added, but old types should not be removed
   for compatibility.  The maximum allowed value is 31. */
#define SSH_CIPHER_NOT_SET	-1	/* None selected (invalid number). */
#define SSH_CIPHER_NONE		0	/* no encryption */
#define SSH_CIPHER_IDEA		1	/* IDEA CFB */
#define SSH_CIPHER_DES		2	/* DES CBC */
#define SSH_CIPHER_3DES		3	/* 3DES CBC */
#define SSH_CIPHER_BROKEN_TSS	4	/* TRI's Simple Stream encryption CBC */
#define SSH_CIPHER_BROKEN_RC4	5	/* Alleged RC4 */
#define SSH_CIPHER_BLOWFISH	6

typedef struct {
	unsigned int type;
	union {
		struct {
			des_key_schedule key1;
			des_key_schedule key2;
			des_cblock iv2;
			des_key_schedule key3;
			des_cblock iv3;
		}       des3;
		struct {
			struct bf_key_st key;
			unsigned char iv[8];
		}       bf;
	}       u;
}       CipherContext;
/* Returns a bit mask indicating which ciphers are supported by this
   implementation.  The bit mask has the corresponding bit set of each
   supported cipher. */
unsigned int cipher_mask();

/* Returns the name of the cipher. */
const char *cipher_name(int cipher);

/* Parses the name of the cipher.  Returns the number of the corresponding
   cipher, or -1 on error. */
int     cipher_number(const char *name);

/* Selects the cipher to use and sets the key.  If for_encryption is true,
   the key is setup for encryption; otherwise it is setup for decryption. */
void 
cipher_set_key(CipherContext * context, int cipher,
    const unsigned char *key, int keylen, int for_encryption);

/* Sets key for the cipher by computing the MD5 checksum of the passphrase,
   and using the resulting 16 bytes as the key. */
void 
cipher_set_key_string(CipherContext * context, int cipher,
    const char *passphrase, int for_encryption);

/* Encrypts data using the cipher. */
void 
cipher_encrypt(CipherContext * context, unsigned char *dest,
    const unsigned char *src, unsigned int len);

/* Decrypts data using the cipher. */
void 
cipher_decrypt(CipherContext * context, unsigned char *dest,
    const unsigned char *src, unsigned int len);

/* If and CRC-32 attack is detected this function is called. Defaults
 * to fatal, changed to packet_disconnect in sshd and ssh. */
extern void (*cipher_attack_detected) (const char *fmt,...);

#endif				/* CIPHER_H */
Commit	Line	Data
8efc0c15	1	/*
5260325f	2	*
	3	* cipher.h
	4	*
	5	* Author: Tatu Ylonen <ylo@cs.hut.fi>
	6	*
	7	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	8	* All rights reserved
	9	*
	10	* Created: Wed Apr 19 16:50:42 1995 ylo
	11	*
	12	*/
8efc0c15	13
	14	/* RCSID("$Id$"); */
	15
	16	#ifndef CIPHER_H
	17	#define CIPHER_H
	18
4d195447	19	#include "config.h"
4d195447	20
5881cd60	21	#ifdef HAVE_OPENSSL
8efc0c15	22	#include <openssl/des.h>
8efc0c15	23	#include <openssl/blowfish.h>
5881cd60	24	#endif
	25	#ifdef HAVE_SSL
	26	#include <ssl/des.h>
	27	#include <ssl/blowfish.h>
	28	#endif
8efc0c15	29
	30	/* Cipher types. New types can be added, but old types should not be removed
	31	for compatibility. The maximum allowed value is 31. */
5260325f	32	#define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */
	33	#define SSH_CIPHER_NONE 0 /* no encryption */
	34	#define SSH_CIPHER_IDEA 1 /* IDEA CFB */
	35	#define SSH_CIPHER_DES 2 /* DES CBC */
	36	#define SSH_CIPHER_3DES 3 /* 3DES CBC */
	37	#define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */
	38	#define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */
8efc0c15	39	#define SSH_CIPHER_BLOWFISH 6
	40
	41	typedef struct {
5260325f	42	unsigned int type;
	43	union {
	44	struct {
	45	des_key_schedule key1;
	46	des_key_schedule key2;
	47	des_cblock iv2;
	48	des_key_schedule key3;
	49	des_cblock iv3;
	50	} des3;
	51	struct {
	52	struct bf_key_st key;
	53	unsigned char iv[8];
	54	} bf;
	55	} u;
	56	} CipherContext;
8efc0c15	57	/* Returns a bit mask indicating which ciphers are supported by this
	58	implementation. The bit mask has the corresponding bit set of each
	59	supported cipher. */
	60	unsigned int cipher_mask();
	61
	62	/* Returns the name of the cipher. */
	63	const char *cipher_name(int cipher);
	64
	65	/* Parses the name of the cipher. Returns the number of the corresponding
	66	cipher, or -1 on error. */
5260325f	67	int cipher_number(const char *name);
8efc0c15	68
	69	/* Selects the cipher to use and sets the key. If for_encryption is true,
	70	the key is setup for encryption; otherwise it is setup for decryption. */
5260325f	71	void
	72	cipher_set_key(CipherContext * context, int cipher,
	73	const unsigned char *key, int keylen, int for_encryption);
8efc0c15	74
	75	/* Sets key for the cipher by computing the MD5 checksum of the passphrase,
	76	and using the resulting 16 bytes as the key. */
5260325f	77	void
	78	cipher_set_key_string(CipherContext * context, int cipher,
	79	const char *passphrase, int for_encryption);
8efc0c15	80
8efc0c15	81	/* Encrypts data using the cipher. */
5260325f	82	void
	83	cipher_encrypt(CipherContext * context, unsigned char *dest,
	84	const unsigned char *src, unsigned int len);
8efc0c15	85
8efc0c15	86	/* Decrypts data using the cipher. */
5260325f	87	void
	88	cipher_decrypt(CipherContext * context, unsigned char *dest,
	89	const unsigned char *src, unsigned int len);
8efc0c15	90
	91	/* If and CRC-32 attack is detected this function is called. Defaults
	92	* to fatal, changed to packet_disconnect in sshd and ssh. */
5260325f	93	extern void (cipher_attack_detected) (const char fmt,...);
8efc0c15	94
5260325f	95	#endif /* CIPHER_H */