base64: sync with libubox modifications

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

base64.c

@@ -1,3 +1,21 @@
+/*
+ * base64 - libubox base64 functions
+ *
+ * Copyright (C) 2015 Felix Fietkau <nbd@openwrt.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
 /*	$OpenBSD: base64.c,v 1.7 2013/12/31 02:32:56 tedu Exp $	*/
 
 /*
@@ -116,8 +134,8 @@ static const char Pad64 = '=';
 	   characters followed by one "=" padding character.
    */
 
-int b64_ntop(const void *_src, size_t srclength,
-	     void *dest, size_t targsize)
+int b64_encode(const void *_src, size_t srclength,
+	       void *dest, size_t targsize)
 {
 	const unsigned char *src = _src;
 	char *target = dest;
@@ -178,7 +196,7 @@ int b64_ntop(const void *_src, size_t srclength,
    it returns the number of data bytes stored at the target, or -1 on error.
  */
 
-int b64_pton(const void *_src, void *dest, size_t targsize)
+int b64_decode(const void *_src, void *dest, size_t targsize)
 {
 	const char *src = _src;
 	unsigned char *target = dest;
@@ -301,5 +319,9 @@ int b64_pton(const void *_src, void *dest, size_t targsize)
 			return (-1);
 	}
 
+	/* Null-terminate if we have room left */
+	if (tarindex < targsize)
+		target[tarindex] = 0;
+
 	return (tarindex);
 }

base64.h

@@ -1,12 +1,12 @@
 #ifndef __BASE64_H
 #define __BASE64_H
 
-int b64_ntop(const void *src, size_t src_len,
-	     void *dest, size_t dest_len);
+int b64_encode(const void *src, size_t src_len,
+	       void *dest, size_t dest_len);
 
-int b64_pton(const void *src, void *dest, size_t dest_len);
+int b64_decode(const void *src, void *dest, size_t dest_len);
 
+#define B64_ENCODE_LEN(_len)	((((_len) + 2) / 3) * 4 + 1)
 #define B64_DECODE_LEN(_len)	(((_len) / 4) * 3 + 1)
-#define B64_ENCODE_LEN(_len)	((((_len) / 3) + 1) * 4 + 1)
 
 #endif

main.c

@@ -135,7 +135,7 @@ static bool
 get_base64_file(const char *file, void *dest, int size, void *buf, int buflen)
 {
 	get_file(file, buf, buflen - 1);
-	return b64_pton(buf, dest, size) == size;
+	return b64_decode(buf, dest, size) == size;
 }
 
 static void write_file(const char *name, const uint8_t *fingerprint,
@@ -245,7 +245,7 @@ static int sign(const char *msgfile)
 	munmap(m, mlen);
 	close(mfd);
 
-	if (b64_ntop(&sig, sizeof(sig), buf, sizeof(buf)) < 0)
+	if (b64_encode(&sig, sizeof(sig), buf, sizeof(buf)) < 0)
 		return 1;
 
 	write_file(sigfile, sig.fingerprint, "signed by key", buf);
@@ -309,7 +309,7 @@ static int generate(void)
 	sha512_add(&s, skey.seckey, sizeof(skey.seckey));
 	memcpy(skey.checksum, sha512_final_get(&s), sizeof(skey.checksum));
 
-	if (b64_ntop(&skey, sizeof(skey), buf, sizeof(buf)) < 0)
+	if (b64_encode(&skey, sizeof(skey), buf, sizeof(buf)) < 0)
 		return 1;
 
 	write_file(seckeyfile, skey.fingerprint, "public key", buf);
@@ -317,7 +317,7 @@ static int generate(void)
 	memcpy(pkey.fingerprint, skey.fingerprint, sizeof(pkey.fingerprint));
 	memcpy(pkey.pubkey, skey.seckey + 32, sizeof(pkey.pubkey));
 
-	if (b64_ntop(&pkey, sizeof(pkey), buf, sizeof(buf)) < 0)
+	if (b64_encode(&pkey, sizeof(pkey), buf, sizeof(buf)) < 0)
 		return 1;
 
 	write_file(pubkeyfile, pkey.fingerprint, "private key", buf);