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116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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/* RCSID("$OpenBSD: cipher.h,v 1.19 2000/09/07 20:27:50 deraadt Exp $"); */
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/* $FreeBSD$ */
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#ifndef CIPHER_H
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#define CIPHER_H
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#include <openssl/des.h>
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#include <openssl/blowfish.h>
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#include <openssl/rc4.h>
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#include <openssl/cast.h>
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/* Cipher types. New types can be added, but old types should not be removed
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for compatibility. The maximum allowed value is 31. */
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#define SSH_CIPHER_ILLEGAL -2 /* No valid cipher selected. */
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#define SSH_CIPHER_NOT_SET -1 /* None selected (invalid number). */
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#define SSH_CIPHER_NONE 0 /* no encryption */
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#define SSH_CIPHER_IDEA 1 /* IDEA CFB */
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#define SSH_CIPHER_DES 2 /* DES CBC */
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#define SSH_CIPHER_3DES 3 /* 3DES CBC */
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#define SSH_CIPHER_BROKEN_TSS 4 /* TRI's Simple Stream encryption CBC */
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#define SSH_CIPHER_BROKEN_RC4 5 /* Alleged RC4 */
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#define SSH_CIPHER_BLOWFISH 6
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#define SSH_CIPHER_RESERVED 7
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/* these ciphers are used in SSH2: */
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#define SSH_CIPHER_BLOWFISH_CBC 8
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#define SSH_CIPHER_3DES_CBC 9
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#define SSH_CIPHER_ARCFOUR 10 /* Alleged RC4 */
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#define SSH_CIPHER_CAST128_CBC 11
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typedef struct {
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unsigned int type;
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union {
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struct {
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des_key_schedule key1;
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des_key_schedule key2;
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des_cblock iv2;
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des_key_schedule key3;
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des_cblock iv3;
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} des3;
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struct {
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struct bf_key_st key;
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unsigned char iv[8];
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} bf;
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struct {
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CAST_KEY key;
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unsigned char iv[8];
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} cast;
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RC4_KEY rc4;
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} u;
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} CipherContext;
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/*
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* Returns a bit mask indicating which ciphers are supported by this
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* implementation. The bit mask has the corresponding bit set of each
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* supported cipher.
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*/
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unsigned int cipher_mask();
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unsigned int cipher_mask1();
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unsigned int cipher_mask2();
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/* Returns the name of the cipher. */
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const char *cipher_name(int cipher);
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/*
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* Parses the name of the cipher. Returns the number of the corresponding
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* cipher, or -1 on error.
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*/
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int cipher_number(const char *name);
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/* returns 1 if all ciphers are supported (ssh2 only) */
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int ciphers_valid(const char *names);
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/*
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* Selects the cipher to use and sets the key. If for_encryption is true,
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* the key is setup for encryption; otherwise it is setup for decryption.
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*/
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void
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cipher_set_key(CipherContext * context, int cipher,
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const unsigned char *key, int keylen);
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void
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cipher_set_key_iv(CipherContext * context, int cipher,
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const unsigned char *key, int keylen,
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const unsigned char *iv, int ivlen);
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/*
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* Sets key for the cipher by computing the MD5 checksum of the passphrase,
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* and using the resulting 16 bytes as the key.
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*/
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void
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cipher_set_key_string(CipherContext * context, int cipher,
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const char *passphrase);
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/* Encrypts data using the cipher. */
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void
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cipher_encrypt(CipherContext * context, unsigned char *dest,
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const unsigned char *src, unsigned int len);
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/* Decrypts data using the cipher. */
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void
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cipher_decrypt(CipherContext * context, unsigned char *dest,
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const unsigned char *src, unsigned int len);
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#endif /* CIPHER_H */
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