--- a/svr-authpubkey.c	Wed Jun 03 22:59:59 2015 +0800
+++ b/svr-authpubkey.c	Thu Jun 04 23:08:50 2015 +0800
@@ -70,10 +70,10 @@
 #define MIN_AUTHKEYS_LINE 10 /* "ssh-rsa AB" - short but doesn't matter */
 #define MAX_AUTHKEYS_LINE 4200 /* max length of a line in authkeys */
 
-static int checkpubkey(unsigned char* algo, unsigned int algolen,
+static int checkpubkey(char* algo, unsigned int algolen,
 		unsigned char* keyblob, unsigned int keybloblen);
 static int checkpubkeyperms();
-static void send_msg_userauth_pk_ok(unsigned char* algo, unsigned int algolen,
+static void send_msg_userauth_pk_ok(char* algo, unsigned int algolen,
 		unsigned char* keyblob, unsigned int keybloblen);
 static int checkfileperm(char * filename);
 
@@ -82,7 +82,7 @@
 void svr_auth_pubkey() {
 
 	unsigned char testkey; /* whether we're just checking if a key is usable */
-	unsigned char* algo = NULL; /* pubkey algo */
+	char* algo = NULL; /* pubkey algo */
 	unsigned int algolen;
 	unsigned char* keyblob = NULL;
 	unsigned int keybloblen;
@@ -173,7 +173,7 @@
 /* Reply that the key is valid for auth, this is sent when the user sends
  * a straight copy of their pubkey to test, to avoid having to perform
  * expensive signing operations with a worthless key */
-static void send_msg_userauth_pk_ok(unsigned char* algo, unsigned int algolen,
+static void send_msg_userauth_pk_ok(char* algo, unsigned int algolen,
 		unsigned char* keyblob, unsigned int keybloblen) {
 
 	TRACE(("enter send_msg_userauth_pk_ok"))
@@ -181,7 +181,7 @@
 
 	buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_PK_OK);
 	buf_putstring(ses.writepayload, algo, algolen);
-	buf_putstring(ses.writepayload, keyblob, keybloblen);
+	buf_putstring(ses.writepayload, (const char*)keyblob, keybloblen);
 
 	encrypt_packet();
 	TRACE(("leave send_msg_userauth_pk_ok"))
@@ -191,7 +191,7 @@
 /* Checks whether a specified publickey (and associated algorithm) is an
  * acceptable key for authentication */
 /* Returns DROPBEAR_SUCCESS if key is ok for auth, DROPBEAR_FAILURE otherwise */
-static int checkpubkey(unsigned char* algo, unsigned int algolen,
+static int checkpubkey(char* algo, unsigned int algolen,
 		unsigned char* keyblob, unsigned int keybloblen) {
 
 	FILE * authfile = NULL;
@@ -260,9 +260,9 @@
 		/* check the key type - will fail if there are options */
 		TRACE(("a line!"))
 
-		if (strncmp(buf_getptr(line, algolen), algo, algolen) != 0) {
+		if (strncmp((const char *) buf_getptr(line, algolen), algo, algolen) != 0) {
 			int is_comment = 0;
-			char *options_start = NULL;
+			unsigned char *options_start = NULL;
 			int options_len = 0;
 			int escape, quoted;
 			
@@ -308,7 +308,7 @@
 			if (line->pos + algolen+3 > line->len) {
 				continue;
 			}
-			if (strncmp(buf_getptr(line, algolen), algo, algolen) != 0) { 
+			if (strncmp((const char *) buf_getptr(line, algolen), algo, algolen) != 0) {
 				continue;
 			}
 		}
@@ -330,7 +330,7 @@
 
 		TRACE(("checkpubkey: line pos = %d len = %d", line->pos, line->len))
 
-		ret = cmp_base64_key(keyblob, keybloblen, algo, algolen, line, NULL);
+		ret = cmp_base64_key(keyblob, keybloblen, (const unsigned char *) algo, algolen, line, NULL);
 
 		if (ret == DROPBEAR_SUCCESS && options_buf) {
 			ret = svr_add_pubkey_options(options_buf, line_num, filename);