+/* ssh2_load_userkey can return this as an error */
+extern struct ssh2_userkey ssh2_wrong_passphrase;
+#define SSH2_WRONG_PASSPHRASE (&ssh2_wrong_passphrase)
+
+int ssh2_userkey_encrypted(const Filename *filename, char **comment);
+struct ssh2_userkey *ssh2_load_userkey(const Filename *filename,
+ char *passphrase, const char **errorstr);
+char *ssh2_userkey_loadpub(const Filename *filename, char **algorithm,
+ int *pub_blob_len, const char **errorstr);
+int ssh2_save_userkey(const Filename *filename, struct ssh2_userkey *key,
+ char *passphrase);
+const struct ssh_signkey *find_pubkey_alg(const char *name);
+
+enum {
+ SSH_KEYTYPE_UNOPENABLE,
+ SSH_KEYTYPE_UNKNOWN,
+ SSH_KEYTYPE_SSH1, SSH_KEYTYPE_SSH2,
+ SSH_KEYTYPE_OPENSSH, SSH_KEYTYPE_SSHCOM
+};
+int key_type(const Filename *filename);
+char *key_type_to_str(int type);
+
+int import_possible(int type);
+int import_target_type(int type);
+int import_encrypted(const Filename *filename, int type, char **comment);
+int import_ssh1(const Filename *filename, int type,
+ struct RSAKey *key, char *passphrase, const char **errmsg_p);
+struct ssh2_userkey *import_ssh2(const Filename *filename, int type,
+ char *passphrase, const char **errmsg_p);
+int export_ssh1(const Filename *filename, int type,
+ struct RSAKey *key, char *passphrase);
+int export_ssh2(const Filename *filename, int type,
+ struct ssh2_userkey *key, char *passphrase);
+
+void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
+void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len);
+void des3_decrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
+ unsigned char *blk, int len);
+void des3_encrypt_pubkey_ossh(unsigned char *key, unsigned char *iv,
+ unsigned char *blk, int len);
+void aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk,
+ int len);
+void aes256_decrypt_pubkey(unsigned char *key, unsigned char *blk,
+ int len);
+
+void des_encrypt_xdmauth(unsigned char *key, unsigned char *blk, int len);
+void des_decrypt_xdmauth(unsigned char *key, unsigned char *blk, int len);
+
+/*
+ * For progress updates in the key generation utility.
+ */
+#define PROGFN_INITIALISE 1
+#define PROGFN_LIN_PHASE 2
+#define PROGFN_EXP_PHASE 3
+#define PROGFN_PHASE_EXTENT 4
+#define PROGFN_READY 5
+#define PROGFN_PROGRESS 6
+typedef void (*progfn_t) (void *param, int action, int phase, int progress);
+
+int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
+ void *pfnparam);
+int dsa_generate(struct dss_key *key, int bits, progfn_t pfn,
+ void *pfnparam);
+Bignum primegen(int bits, int modulus, int residue, Bignum factor,
+ int phase, progfn_t pfn, void *pfnparam);
+
+
+/*
+ * zlib compression.
+ */
+void *zlib_compress_init(void);
+void zlib_compress_cleanup(void *);
+void *zlib_decompress_init(void);
+void zlib_decompress_cleanup(void *);
+int zlib_compress_block(void *, unsigned char *block, int len,
+ unsigned char **outblock, int *outlen);
+int zlib_decompress_block(void *, unsigned char *block, int len,
+ unsigned char **outblock, int *outlen);
+
+/*
+ * SSH-1 agent messages.
+ */
+#define SSH1_AGENTC_REQUEST_RSA_IDENTITIES 1
+#define SSH1_AGENT_RSA_IDENTITIES_ANSWER 2
+#define SSH1_AGENTC_RSA_CHALLENGE 3
+#define SSH1_AGENT_RSA_RESPONSE 4
+#define SSH1_AGENTC_ADD_RSA_IDENTITY 7
+#define SSH1_AGENTC_REMOVE_RSA_IDENTITY 8
+#define SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9 /* openssh private? */
+
+/*
+ * Messages common to SSH-1 and OpenSSH's SSH-2.
+ */
+#define SSH_AGENT_FAILURE 5
+#define SSH_AGENT_SUCCESS 6
+
+/*
+ * OpenSSH's SSH-2 agent messages.
+ */
+#define SSH2_AGENTC_REQUEST_IDENTITIES 11
+#define SSH2_AGENT_IDENTITIES_ANSWER 12
+#define SSH2_AGENTC_SIGN_REQUEST 13
+#define SSH2_AGENT_SIGN_RESPONSE 14
+#define SSH2_AGENTC_ADD_IDENTITY 17
+#define SSH2_AGENTC_REMOVE_IDENTITY 18
+#define SSH2_AGENTC_REMOVE_ALL_IDENTITIES 19
+
+/*
+ * Need this to warn about support for the original SSH-2 keyfile
+ * format.
+ */
+void old_keyfile_warning(void);