--- a/keyimport.c	Wed Jun 03 22:59:59 2015 +0800
+++ b/keyimport.c	Thu Jun 04 22:25:28 2015 +0800
@@ -193,7 +193,7 @@
 static void base64_encode_fp(FILE * fp, unsigned char *data,
 		int datalen, int cpl)
 {
-    char out[100];
+	unsigned char out[100];
     int n;
 	unsigned long outlen;
 	int rawcpl;
@@ -445,7 +445,7 @@
 						ret->keyblob_size);
 			}
 			outlen = ret->keyblob_size - ret->keyblob_len;
-			if (base64_decode(buffer, len, 
+			if (base64_decode((const unsigned char *)buffer, len,
 						ret->keyblob + ret->keyblob_len, &outlen) != CRYPT_OK){
 				errmsg = "Error decoding base64";
 				goto error;
@@ -507,7 +507,7 @@
 	int i, num_integers = 0;
 	sign_key *retval = NULL;
 	char *errmsg;
-	char *modptr = NULL;
+	unsigned char *modptr = NULL;
 	int modlen = -9999;
 	enum signkey_type type;
 
@@ -602,13 +602,13 @@
 
 #ifdef DROPBEAR_DSS
 	if (key->type == OSSH_DSA) {
-		buf_putstring(blobbuf, "ssh-dss", 7);
+		buf_putstring(blobbuf, (const unsigned char *)"ssh-dss", 7);
 		retkey->type = DROPBEAR_SIGNKEY_DSS;
 	} 
 #endif
 #ifdef DROPBEAR_RSA
 	if (key->type == OSSH_RSA) {
-		buf_putstring(blobbuf, "ssh-rsa", 7);
+		buf_putstring(blobbuf, (const unsigned char *)"ssh-rsa", 7);
 		retkey->type = DROPBEAR_SIGNKEY_RSA;
 	}
 #endif
@@ -646,7 +646,7 @@
 			 */
 			if (i == 1) {
 				/* Save the details for after we deal with number 2. */
-				modptr = (char *)p;
+				modptr = p;
 				modlen = len;
 			} else if (i >= 2 && i <= 5) {
 				buf_putstring(blobbuf, p, len);
@@ -1043,7 +1043,7 @@
 		int curve_oid_len = 0;
 		const void* curve_oid = NULL;
 		unsigned long pubkey_size = 2*curve_size+1;
-		unsigned int k_size;
+		int k_size;
 		int err = 0;
 
 		/* version. less than 10 bytes */