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Annotation of src/usr.bin/ssh/cipher.h, Revision 1.10

1.1       deraadt     1: /*
1.9       deraadt     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:  */
1.1       deraadt    13:
1.10    ! markus     14: /* RCSID("$Id: cipher.h,v 1.9 1999/11/24 00:26:01 deraadt Exp $"); */
1.1       deraadt    15:
                     16: #ifndef CIPHER_H
                     17: #define CIPHER_H
                     18:
1.8       markus     19: #include <ssl/des.h>
1.7       deraadt    20: #include <ssl/blowfish.h>
1.1       deraadt    21:
                     22: /* Cipher types.  New types can be added, but old types should not be removed
                     23:    for compatibility.  The maximum allowed value is 31. */
1.9       deraadt    24: #define SSH_CIPHER_NOT_SET     -1      /* None selected (invalid number). */
                     25: #define SSH_CIPHER_NONE                0       /* no encryption */
                     26: #define SSH_CIPHER_IDEA                1       /* IDEA CFB */
                     27: #define SSH_CIPHER_DES         2       /* DES CBC */
                     28: #define SSH_CIPHER_3DES                3       /* 3DES CBC */
                     29: #define SSH_CIPHER_BROKEN_TSS  4       /* TRI's Simple Stream encryption CBC */
                     30: #define SSH_CIPHER_BROKEN_RC4  5       /* Alleged RC4 */
1.1       deraadt    31: #define SSH_CIPHER_BLOWFISH    6
                     32:
                     33: typedef struct {
1.9       deraadt    34:        unsigned int type;
                     35:        union {
                     36:                struct {
                     37:                        des_key_schedule key1;
                     38:                        des_key_schedule key2;
                     39:                        des_cblock iv2;
                     40:                        des_key_schedule key3;
                     41:                        des_cblock iv3;
                     42:                }       des3;
                     43:                struct {
                     44:                        struct bf_key_st key;
                     45:                        unsigned char iv[8];
                     46:                }       bf;
                     47:        }       u;
                     48: }       CipherContext;
1.10    ! markus     49: /*
        !            50:  * Returns a bit mask indicating which ciphers are supported by this
        !            51:  * implementation.  The bit mask has the corresponding bit set of each
        !            52:  * supported cipher.
        !            53:  */
1.1       deraadt    54: unsigned int cipher_mask();
                     55:
                     56: /* Returns the name of the cipher. */
                     57: const char *cipher_name(int cipher);
                     58:
1.10    ! markus     59: /*
        !            60:  * Parses the name of the cipher.  Returns the number of the corresponding
        !            61:  * cipher, or -1 on error.
        !            62:  */
1.9       deraadt    63: int     cipher_number(const char *name);
1.1       deraadt    64:
1.10    ! markus     65: /*
        !            66:  * Selects the cipher to use and sets the key.  If for_encryption is true,
        !            67:  * the key is setup for encryption; otherwise it is setup for decryption.
        !            68:  */
1.9       deraadt    69: void
                     70: cipher_set_key(CipherContext * context, int cipher,
                     71:     const unsigned char *key, int keylen, int for_encryption);
1.1       deraadt    72:
1.10    ! markus     73: /*
        !            74:  * Sets key for the cipher by computing the MD5 checksum of the passphrase,
        !            75:  * and using the resulting 16 bytes as the key.
        !            76:  */
1.9       deraadt    77: void
                     78: cipher_set_key_string(CipherContext * context, int cipher,
                     79:     const char *passphrase, int for_encryption);
1.1       deraadt    80:
                     81: /* Encrypts data using the cipher. */
1.9       deraadt    82: void
                     83: cipher_encrypt(CipherContext * context, unsigned char *dest,
                     84:     const unsigned char *src, unsigned int len);
1.1       deraadt    85:
                     86: /* Decrypts data using the cipher. */
1.9       deraadt    87: void
                     88: cipher_decrypt(CipherContext * context, unsigned char *dest,
                     89:     const unsigned char *src, unsigned int len);
1.1       deraadt    90:
1.10    ! markus     91: /*
        !            92:  * If and CRC-32 attack is detected this function is called. Defaults to
        !            93:  * fatal, changed to packet_disconnect in sshd and ssh.
        !            94:  */
        !            95: extern void (*cipher_attack_detected) (const char *fmt, ...);
1.1       deraadt    96:
1.9       deraadt    97: #endif                         /* CIPHER_H */