package org.argeo.osgi.useradmin;
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
+import java.util.Arrays;
+/** Utilities around digests, mostly those related to passwords. */
class DigestUtils {
static byte[] sha1(byte[] bytes) {
try {
}
}
- private DigestUtils() {
+ static char[] bytesToChars(Object obj) {
+ if (obj instanceof char[])
+ return (char[]) obj;
+ if (!(obj instanceof byte[]))
+ throw new IllegalArgumentException(obj.getClass() + " is not a byte array");
+ ByteBuffer fromBuffer = ByteBuffer.wrap((byte[]) obj);
+ CharBuffer toBuffer = StandardCharsets.UTF_8.decode(fromBuffer);
+ char[] res = Arrays.copyOfRange(toBuffer.array(), toBuffer.position(), toBuffer.limit());
+ // Arrays.fill(fromBuffer.array(), (byte) 0); // clear sensitive data
+ // Arrays.fill((byte[]) obj, (byte) 0); // clear sensitive data
+ // Arrays.fill(toBuffer.array(), '\u0000'); // clear sensitive data
+ return res;
+ }
+
+ static byte[] charsToBytes(char[] chars) {
+ CharBuffer charBuffer = CharBuffer.wrap(chars);
+ ByteBuffer byteBuffer = StandardCharsets.UTF_8.encode(charBuffer);
+ byte[] bytes = Arrays.copyOfRange(byteBuffer.array(), byteBuffer.position(), byteBuffer.limit());
+ // Arrays.fill(charBuffer.array(), '\u0000'); // clear sensitive data
+ // Arrays.fill(byteBuffer.array(), (byte) 0); // clear sensitive data
+ return bytes;
}
+ static String sha1str(String str) {
+ byte[] hash = sha1(str.getBytes(StandardCharsets.UTF_8));
+ return encodeHexString(hash);
+ }
+
+ final private static char[] hexArray = "0123456789abcdef".toCharArray();
+
+ /**
+ * From
+ * http://stackoverflow.com/questions/9655181/how-to-convert-a-byte-array-to
+ * -a-hex-string-in-java
+ */
+ public static String encodeHexString(byte[] bytes) {
+ char[] hexChars = new char[bytes.length * 2];
+ for (int j = 0; j < bytes.length; j++) {
+ int v = bytes[j] & 0xFF;
+ hexChars[j * 2] = hexArray[v >>> 4];
+ hexChars[j * 2 + 1] = hexArray[v & 0x0F];
+ }
+ return new String(hexChars);
+ }
+
+ private DigestUtils() {
+ }
}