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Annotation of src/usr.bin/ssh/cipher.h, Revision 1.9

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:
1.9     ! deraadt    14: /* RCSID("$Id: cipher.h,v 1.8 1999/11/15 21:38:54 markus 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;
1.1       deraadt    49: /* Returns a bit mask indicating which ciphers are supported by this
                     50:    implementation.  The bit mask has the corresponding bit set of each
                     51:    supported cipher. */
                     52: unsigned int cipher_mask();
                     53:
                     54: /* Returns the name of the cipher. */
                     55: const char *cipher_name(int cipher);
                     56:
                     57: /* Parses the name of the cipher.  Returns the number of the corresponding
                     58:    cipher, or -1 on error. */
1.9     ! deraadt    59: int     cipher_number(const char *name);
1.1       deraadt    60:
                     61: /* Selects the cipher to use and sets the key.  If for_encryption is true,
                     62:    the key is setup for encryption; otherwise it is setup for decryption. */
1.9     ! deraadt    63: void
        !            64: cipher_set_key(CipherContext * context, int cipher,
        !            65:     const unsigned char *key, int keylen, int for_encryption);
1.1       deraadt    66:
                     67: /* Sets key for the cipher by computing the MD5 checksum of the passphrase,
                     68:    and using the resulting 16 bytes as the key. */
1.9     ! deraadt    69: void
        !            70: cipher_set_key_string(CipherContext * context, int cipher,
        !            71:     const char *passphrase, int for_encryption);
1.1       deraadt    72:
                     73: /* Encrypts data using the cipher. */
1.9     ! deraadt    74: void
        !            75: cipher_encrypt(CipherContext * context, unsigned char *dest,
        !            76:     const unsigned char *src, unsigned int len);
1.1       deraadt    77:
                     78: /* Decrypts data using the cipher. */
1.9     ! deraadt    79: void
        !            80: cipher_decrypt(CipherContext * context, unsigned char *dest,
        !            81:     const unsigned char *src, unsigned int len);
1.1       deraadt    82:
                     83: /* If and CRC-32 attack is detected this function is called. Defaults
                     84:  * to fatal, changed to packet_disconnect in sshd and ssh. */
1.9     ! deraadt    85: extern void (*cipher_attack_detected) (const char *fmt,...);
1.1       deraadt    86:
1.9     ! deraadt    87: #endif                         /* CIPHER_H */