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Annotation of src/usr.bin/ssh/cipher.h, Revision 1.7

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:
1.7     ! deraadt    14: /* RCSID("$Id: cipher.h,v 1.6 1999/09/30 19:22:58 deraadt Exp $"); */
1.1       deraadt    15:
                     16: #ifndef CIPHER_H
                     17: #define CIPHER_H
                     18:
1.6       deraadt    19: #include <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. */
                     24: #define SSH_CIPHER_NOT_SET     -1 /* None selected (invalid number). */
                     25: #define SSH_CIPHER_NONE                0 /* no encryption */
1.4       provos     26: #define SSH_CIPHER_IDEA                1 /* IDEA CFB */
1.1       deraadt    27: #define SSH_CIPHER_DES         2 /* DES CBC */
                     28: #define SSH_CIPHER_3DES                3 /* 3DES CBC */
                     29: #define SSH_CIPHER_TSS         4 /* TRI's Simple Stream encryption CBC */
                     30: #define SSH_CIPHER_RC4         5 /* Alleged RC4 */
                     31: #define SSH_CIPHER_BLOWFISH    6
                     32:
                     33: typedef struct {
                     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;
                     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: unsigned int cipher_mask();
                     54:
                     55: /* Returns the name of the cipher. */
                     56: const char *cipher_name(int cipher);
                     57:
                     58: /* Parses the name of the cipher.  Returns the number of the corresponding
                     59:    cipher, or -1 on error. */
                     60: int cipher_number(const char *name);
                     61:
                     62: /* Selects the cipher to use and sets the key.  If for_encryption is true,
                     63:    the key is setup for encryption; otherwise it is setup for decryption. */
                     64: void cipher_set_key(CipherContext *context, int cipher,
                     65:                    const unsigned char *key, int keylen, int for_encryption);
                     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. */
                     69: void cipher_set_key_string(CipherContext *context, int cipher,
                     70:                           const char *passphrase, int for_encryption);
                     71:
                     72: /* Encrypts data using the cipher. */
                     73: void cipher_encrypt(CipherContext *context, unsigned char *dest,
                     74:                    const unsigned char *src, unsigned int len);
                     75:
                     76: /* Decrypts data using the cipher. */
                     77: void cipher_decrypt(CipherContext *context, unsigned char *dest,
                     78:                    const unsigned char *src, unsigned int len);
                     79:
                     80: /* If and CRC-32 attack is detected this function is called. Defaults
                     81:  * to fatal, changed to packet_disconnect in sshd and ssh. */
                     82: extern void (*cipher_attack_detected)(const char *fmt, ...);
                     83:
                     84: #endif /* CIPHER_H */