Initial revision

1 files changed, 84 insertions, 0 deletions

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+/*
+
+cipher.h
+
+Author: Tatu Ylonen <ylo@cs.hut.fi>
+
+Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+                   All rights reserved
+
+Created: Wed Apr 19 16:50:42 1995 ylo
+
+*/
+
+/* RCSID("$Id: cipher.h,v 1.1 1999/10/27 03:42:44 damien Exp $"); */
+
+#ifndef CIPHER_H
+#define CIPHER_H
+
+#include <openssl/des.h>
+#include <openssl/blowfish.h>
+
+/* Cipher types.  New types can be added, but old types should not be removed
+   for compatibility.  The maximum allowed value is 31. */
+#define SSH_CIPHER_NOT_SET	-1 /* None selected (invalid number). */
+#define SSH_CIPHER_NONE		0 /* no encryption */
+#define SSH_CIPHER_IDEA		1 /* IDEA CFB */
+#define SSH_CIPHER_DES		2 /* DES CBC */
+#define SSH_CIPHER_3DES		3 /* 3DES CBC */
+#define SSH_CIPHER_TSS		4 /* TRI's Simple Stream encryption CBC */
+#define SSH_CIPHER_RC4		5 /* Alleged RC4 */
+#define SSH_CIPHER_BLOWFISH	6
+
+typedef struct {
+  unsigned int type;
+  union {
+    struct {
+      des_key_schedule key1;
+      des_key_schedule key2;
+      des_cblock iv2;
+      des_key_schedule key3;
+      des_cblock iv3;
+    } des3;
+    struct {
+      struct bf_key_st key;
+      unsigned char iv[8];
+    } bf;
+  } u;
+} CipherContext;
+
+/* Returns a bit mask indicating which ciphers are supported by this
+   implementation.  The bit mask has the corresponding bit set of each
+   supported cipher. */
+unsigned int cipher_mask();
+
+/* Returns the name of the cipher. */
+const char *cipher_name(int cipher);
+
+/* Parses the name of the cipher.  Returns the number of the corresponding
+   cipher, or -1 on error. */
+int cipher_number(const char *name);
+
+/* Selects the cipher to use and sets the key.  If for_encryption is true,
+   the key is setup for encryption; otherwise it is setup for decryption. */
+void cipher_set_key(CipherContext *context, int cipher,
+		    const unsigned char *key, int keylen, int for_encryption);
+
+/* Sets key for the cipher by computing the MD5 checksum of the passphrase,
+   and using the resulting 16 bytes as the key. */
+void cipher_set_key_string(CipherContext *context, int cipher,
+			   const char *passphrase, int for_encryption);
+
+/* Encrypts data using the cipher. */
+void cipher_encrypt(CipherContext *context, unsigned char *dest,
+		    const unsigned char *src, unsigned int len);
+
+/* Decrypts data using the cipher. */
+void cipher_decrypt(CipherContext *context, unsigned char *dest,
+		    const unsigned char *src, unsigned int len);
+
+/* If and CRC-32 attack is detected this function is called. Defaults
+ * to fatal, changed to packet_disconnect in sshd and ssh. */
+extern void (*cipher_attack_detected)(const char *fmt, ...);
+
+#endif /* CIPHER_H */