[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("$Id$"); */

#include "config.h"

#ifndef CIPHER_H
#define CIPHER_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_TSS		4 /* TRI's Simple Stream encryption CBC */
#define SSH_CIPHER_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	/*
	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	*/
	13
	14	/* RCSID("$Id$"); */
	15
5881cd60	16	#include "config.h"
5881cd60	17
8efc0c15	18	#ifndef CIPHER_H
	19	#define CIPHER_H
	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. */
	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_TSS 4 /* TRI's Simple Stream encryption CBC */
	38	#define SSH_CIPHER_RC4 5 /* Alleged RC4 */
	39	#define SSH_CIPHER_BLOWFISH 6
	40
	41	typedef struct {
	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;
	57
	58	/* Returns a bit mask indicating which ciphers are supported by this
	59	implementation. The bit mask has the corresponding bit set of each
	60	supported cipher. */
	61	unsigned int cipher_mask();
	62
	63	/* Returns the name of the cipher. */
	64	const char *cipher_name(int cipher);
	65
	66	/* Parses the name of the cipher. Returns the number of the corresponding
	67	cipher, or -1 on error. */
	68	int cipher_number(const char *name);
	69
	70	/* Selects the cipher to use and sets the key. If for_encryption is true,
	71	the key is setup for encryption; otherwise it is setup for decryption. */
	72	void cipher_set_key(CipherContext *context, int cipher,
	73	const unsigned char *key, int keylen, int for_encryption);
	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. */
	77	void cipher_set_key_string(CipherContext *context, int cipher,
	78	const char *passphrase, int for_encryption);
	79
	80	/* Encrypts data using the cipher. */
	81	void cipher_encrypt(CipherContext context, unsigned char dest,
	82	const unsigned char *src, unsigned int len);
	83
	84	/* Decrypts data using the cipher. */
	85	void cipher_decrypt(CipherContext context, unsigned char dest,
	86	const unsigned char *src, unsigned int len);
	87
	88	/* If and CRC-32 attack is detected this function is called. Defaults
	89	* to fatal, changed to packet_disconnect in sshd and ssh. */
	90	extern void (cipher_attack_detected)(const char fmt, ...);
	91
	92	#endif /* CIPHER_H */