--- a/libtomcrypt/src/misc/base64/base64_encode.c	Thu Feb 08 23:11:40 2018 +0800
+++ b/libtomcrypt/src/misc/base64/base64_encode.c	Fri Feb 09 21:44:05 2018 +0800
@@ -5,32 +5,31 @@
  *
  * The library is free for all purposes without any express
  * guarantee it works.
- *
- * Tom St Denis, [email protected], http://libtom.org
  */
 #include "tomcrypt.h"
 
 /**
   @file base64_encode.c
   Compliant base64 encoder donated by Wayne Scott ([email protected])
+  base64 URL Safe variant (RFC 4648 section 5) by Karel Miko
 */
 
 
-#ifdef LTC_BASE64
+#if defined(LTC_BASE64) || defined (LTC_BASE64_URL)
 
-static const char *codes = 
+#if defined(LTC_BASE64)
+static const char * const codes_base64 =
 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+#endif /* LTC_BASE64 */
 
-/**
-   base64 Encode a buffer (NUL terminated)
-   @param in      The input buffer to encode
-   @param inlen   The length of the input buffer
-   @param out     [out] The destination of the base64 encoded data
-   @param outlen  [in/out] The max size and resulting size
-   @return CRYPT_OK if successful
-*/
-int base64_encode(const unsigned char *in,  unsigned long inlen, 
-                        unsigned char *out, unsigned long *outlen)
+#if defined(LTC_BASE64_URL)
+static const char * const codes_base64url =
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+#endif /* LTC_BASE64_URL */
+
+static int _base64_encode_internal(const unsigned char *in,  unsigned long inlen,
+                                 unsigned char *out, unsigned long *outlen,
+                                 const char *codes, int pad)
 {
    unsigned long i, len2, leven;
    unsigned char *p;
@@ -61,21 +60,65 @@
 
        *p++ = codes[(a >> 2) & 0x3F];
        *p++ = codes[(((a & 3) << 4) + (b >> 4)) & 0x3F];
-       *p++ = (i+1 < inlen) ? codes[(((b & 0xf) << 2)) & 0x3F] : '=';
-       *p++ = '=';
+       if (pad) {
+         *p++ = (i+1 < inlen) ? codes[(((b & 0xf) << 2)) & 0x3F] : '=';
+         *p++ = '=';
+       }
+       else {
+         if (i+1 < inlen) *p++ = codes[(((b & 0xf) << 2)) & 0x3F];
+       }
    }
 
    /* append a NULL byte */
    *p = '\0';
 
    /* return ok */
-   *outlen = p - out;
+   *outlen = (unsigned long)(p - out);
    return CRYPT_OK;
 }
 
+#if defined(LTC_BASE64)
+/**
+   base64 Encode a buffer (NUL terminated)
+   @param in      The input buffer to encode
+   @param inlen   The length of the input buffer
+   @param out     [out] The destination of the base64 encoded data
+   @param outlen  [in/out] The max size and resulting size
+   @return CRYPT_OK if successful
+*/
+int base64_encode(const unsigned char *in,  unsigned long inlen,
+                        unsigned char *out, unsigned long *outlen)
+{
+    return _base64_encode_internal(in, inlen, out, outlen, codes_base64, 1);
+}
+#endif /* LTC_BASE64 */
+
+
+#if defined(LTC_BASE64_URL)
+/**
+   base64 (URL Safe, RFC 4648 section 5) Encode a buffer (NUL terminated)
+   @param in      The input buffer to encode
+   @param inlen   The length of the input buffer
+   @param out     [out] The destination of the base64 encoded data
+   @param outlen  [in/out] The max size and resulting size
+   @return CRYPT_OK if successful
+*/
+int base64url_encode(const unsigned char *in,  unsigned long inlen,
+                           unsigned char *out, unsigned long *outlen)
+{
+    return _base64_encode_internal(in, inlen, out, outlen, codes_base64url, 0);
+}
+
+int base64url_strict_encode(const unsigned char *in,  unsigned long inlen,
+                           unsigned char *out, unsigned long *outlen)
+{
+    return _base64_encode_internal(in, inlen, out, outlen, codes_base64url, 1);
+}
+#endif /* LTC_BASE64_URL */
+
 #endif
 
 
-/* $Source$ */
-/* $Revision$ */
-/* $Date$ */
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */