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Annotation of src/usr.bin/ssh/cipher.h, Revision 1.1

1.1     ! deraadt     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: cipher.h,v 1.9 1999/05/28 15:21:52 bg Exp $"); */
        !            15:
        !            16: #ifndef CIPHER_H
        !            17: #define CIPHER_H
        !            18:
        !            19: #ifdef WITH_IDEA
        !            20: #include "idea.h"
        !            21: #endif /* WITH_IDEA */
        !            22: #include "des.h"
        !            23: #ifdef WITH_RC4
        !            24: #include "rc4.h"
        !            25: #endif
        !            26: #ifdef WITH_BLOWFISH
        !            27: #include "blowfish.h"
        !            28: #endif
        !            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: #ifdef WITH_IDEA
        !            45:     struct {
        !            46:       IDEAContext key;
        !            47:       unsigned char iv[8];
        !            48:     } idea;
        !            49: #endif /* WITH_IDEA */
        !            50: #ifdef WITH_DES
        !            51:     struct {
        !            52:       des_key_schedule key;
        !            53:       des_cblock iv;
        !            54:     } des;
        !            55: #endif /* WITH_DES */
        !            56:     struct {
        !            57:       des_key_schedule key1;
        !            58:       des_key_schedule key2;
        !            59:       des_cblock iv2;
        !            60:       des_key_schedule key3;
        !            61:       des_cblock iv3;
        !            62:     } des3;
        !            63: #ifdef WITH_RC4
        !            64:     RC4Context rc4;
        !            65: #endif
        !            66: #ifdef WITH_BLOWFISH
        !            67:     struct {
        !            68:       struct bf_key_st key;
        !            69:       unsigned char iv[8];
        !            70:     } bf;
        !            71: #endif /* WITH_BLOWFISH */
        !            72:   } u;
        !            73: } CipherContext;
        !            74:
        !            75: /* Returns a bit mask indicating which ciphers are supported by this
        !            76:    implementation.  The bit mask has the corresponding bit set of each
        !            77:    supported cipher. */
        !            78: unsigned int cipher_mask();
        !            79:
        !            80: /* Returns the name of the cipher. */
        !            81: const char *cipher_name(int cipher);
        !            82:
        !            83: /* Parses the name of the cipher.  Returns the number of the corresponding
        !            84:    cipher, or -1 on error. */
        !            85: int cipher_number(const char *name);
        !            86:
        !            87: /* Selects the cipher to use and sets the key.  If for_encryption is true,
        !            88:    the key is setup for encryption; otherwise it is setup for decryption. */
        !            89: void cipher_set_key(CipherContext *context, int cipher,
        !            90:                    const unsigned char *key, int keylen, int for_encryption);
        !            91:
        !            92: /* Sets key for the cipher by computing the MD5 checksum of the passphrase,
        !            93:    and using the resulting 16 bytes as the key. */
        !            94: void cipher_set_key_string(CipherContext *context, int cipher,
        !            95:                           const char *passphrase, int for_encryption);
        !            96:
        !            97: /* Encrypts data using the cipher. */
        !            98: void cipher_encrypt(CipherContext *context, unsigned char *dest,
        !            99:                    const unsigned char *src, unsigned int len);
        !           100:
        !           101: /* Decrypts data using the cipher. */
        !           102: void cipher_decrypt(CipherContext *context, unsigned char *dest,
        !           103:                    const unsigned char *src, unsigned int len);
        !           104:
        !           105: /* If and CRC-32 attack is detected this function is called. Defaults
        !           106:  * to fatal, changed to packet_disconnect in sshd and ssh. */
        !           107: extern void (*cipher_attack_detected)(const char *fmt, ...);
        !           108:
        !           109: #endif /* CIPHER_H */