+int rsakey_encrypted(char *filename, char **comment);
+int rsakey_pubblob(char *filename, void **blob, int *bloblen);
+
+int saversakey(char *filename, struct RSAKey *key, char *passphrase);
+
+void base64_encode_atom(unsigned char *data, int n, char *out);
+
+/* 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(char *filename, char **comment);
+struct ssh2_userkey *ssh2_load_userkey(char *filename, char *passphrase);
+char *ssh2_userkey_loadpub(char *filename, char **algorithm,
+ int *pub_blob_len);
+int ssh2_save_userkey(char *filename, struct ssh2_userkey *key,
+ char *passphrase);
+
+int keyfile_version(char *filename);
+
+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 aes256_encrypt_pubkey(unsigned char *key, unsigned char *blk,
+ int len);
+void aes256_decrypt_pubkey(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_decompress_init(void);
+int zlib_compress_block(unsigned char *block, int len,
+ unsigned char **outblock, int *outlen);
+int zlib_decompress_block(unsigned char *block, int len,
+ unsigned char **outblock, int *outlen);