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/*
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: cipher.h,v 1.2 1999/09/26 21:02:15 deraadt Exp $"); */
#ifndef CIPHER_H
#define CIPHER_H
#include "des.h"
#ifdef WITH_RC4
#include "rc4.h"
#endif
#ifdef WITH_BLOWFISH
#include "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 -- not implemented */
#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 {
#ifdef WITH_DES
struct {
des_key_schedule key;
des_cblock iv;
} des;
#endif /* WITH_DES */
struct {
des_key_schedule key1;
des_key_schedule key2;
des_cblock iv2;
des_key_schedule key3;
des_cblock iv3;
} des3;
#ifdef WITH_RC4
RC4Context rc4;
#endif
#ifdef WITH_BLOWFISH
struct {
struct bf_key_st key;
unsigned char iv[8];
} bf;
#endif /* WITH_BLOWFISH */
} 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 */
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