Use "charAt" instead of "toCharArray" because it is more efficient.

PiperOrigin-RevId: 390998910

1 files changed, 4 insertions, 2 deletions

diff --git a/java_src/src/main/java/com/google/crypto/tink/jwt/JwtFormat.java b/java_src/src/main/java/com/google/crypto/tink/jwt/JwtFormat.java
index e9b6e7b75..ce54c65f4 100644
--- a/java_src/src/main/java/com/google/crypto/tink/jwt/JwtFormat.java
+++ b/java_src/src/main/java/com/google/crypto/tink/jwt/JwtFormat.java
@@ -66,7 +66,8 @@ final class JwtFormat {
   }
 
   static byte[] strictUrlSafeDecode(String encodedData) throws JwtInvalidException {
-    for (char c : encodedData.toCharArray()) {
+    for (int i = 0; i < encodedData.length(); i++) {
+      char c = encodedData.charAt(i);
       if (!isValidUrlsafeBase64Char(c)) {
         throw new JwtInvalidException("invalid encoding");
       }
@@ -226,7 +227,8 @@ final class JwtFormat {
   }
 
   static void validateASCII(String data) throws JwtInvalidException {
-    for (char c : data.toCharArray()) {
+    for (int i = 0; i < data.length(); i++) {
+      char c = data.charAt(i);
       if ((c & 0x80) > 0) {
         throw new JwtInvalidException("Non ascii character");
       }