New web library (http/https)

[fanfix.git] / src / be / nikiroo / utils / HashUtils.java

diff --git a/src/be/nikiroo/utils/HashUtils.java b/src/be/nikiroo/utils/HashUtils.java
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+++ b/src/be/nikiroo/utils/HashUtils.java
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+package be.nikiroo.utils;
+
+import java.io.UnsupportedEncodingException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * Small class to easily hash some values in a few different ways.
+ * <p>
+ * Does <b>not</b> handle the salt itself, you have to add it yourself.
+ * 
+ * @author niki
+ */
+public class HashUtils {
+       /**
+        * Hash the given value.
+        * 
+        * @param value
+        *            the value to hash
+        * 
+        * @return the hash that can be used to confirm a value
+        * 
+        * @throws RuntimeException
+        *             if UTF-8 support is not available (!) or SHA-512 support is
+        *             not available
+        * @throws NullPointerException
+        *             if email or pass is NULL
+        */
+       static public String sha512(String value) {
+               return hash("SHA-512", value);
+       }
+
+       /**
+        * Hash the given value.
+        * 
+        * @param value
+        *            the value to hash
+        * 
+        * @return the hash that can be used to confirm the a value
+        * 
+        * @throws RuntimeException
+        *             if UTF-8 support is not available (!) or MD5 support is not
+        *             available
+        * @throws NullPointerException
+        *             if email or pass is NULL
+        */
+       static public String md5(String value) {
+               return hash("MD5", value);
+       }
+
+       /**
+        * Hash the given value.
+        * 
+        * @param algo
+        *            the hash algorithm to use ("MD5" and "SHA-512" are supported)
+        * @param value
+        *            the value to hash
+        * 
+        * @return the hash that can be used to confirm a value
+        * 
+        * @throws RuntimeException
+        *             if UTF-8 support is not available (!) or the algorithm
+        *             support is not available
+        * @throws NullPointerException
+        *             if email or pass is NULL
+        */
+       static private String hash(String algo, String value) {
+               try {
+                       MessageDigest md = MessageDigest.getInstance(algo);
+                       md.update(value.getBytes("UTF-8"));
+                       byte byteData[] = md.digest();
+
+                       StringBuffer hexString = new StringBuffer();
+                       for (int i = 0; i < byteData.length; i++) {
+                               String hex = Integer.toHexString(0xff & byteData[i]);
+                               if (hex.length() % 2 == 1)
+                                       hexString.append('0');
+                               hexString.append(hex);
+                       }
+
+                       return hexString.toString();
+               } catch (NoSuchAlgorithmException e) {
+                       throw new RuntimeException(algo + " hashing not available", e);
+               } catch (UnsupportedEncodingException e) {
+                       throw new RuntimeException(
+                                       "UTF-8 encoding is required in a compatible JVM", e);
+               }
+       }
+}