| 0,0 → 1,71 |
|---|
| package org.vt.ece4564.latmb; |
| |
| import java.security.MessageDigest; |
| |
| import javax.crypto.Mac; |
| import javax.crypto.spec.SecretKeySpec; |
| |
| public class SecurityUtil { |
| |
| private static final String HMAC_SHA1_ALGORITHM = "HmacSHA1"; |
| |
| |
| private static String convertToHex(byte[] data) { |
| StringBuffer buf = new StringBuffer(); |
| for (int i = 0; i < data.length; i++) { |
| int halfbyte = (data[i] >>> 4) & 0x0F; |
| int two_halfs = 0; |
| do { |
| if ((0 <= halfbyte) && (halfbyte <= 9)) |
| buf.append((char) ('0' + halfbyte)); |
| else |
| buf.append((char) ('a' + (halfbyte - 10))); |
| halfbyte = data[i] & 0x0F; |
| } while (two_halfs++ < 1); |
| } |
| return buf.toString(); |
| } |
| |
| public static String getSha1Hash(String text) { |
| try { |
| MessageDigest md; |
| md = MessageDigest.getInstance("SHA-1"); |
| byte[] sha1hash = new byte[40]; |
| md.update(text.getBytes("iso-8859-1"), 0, text.length()); |
| sha1hash = md.digest(); |
| return convertToHex(sha1hash); |
| } catch (Exception e) { |
| } |
| |
| return null; |
| } |
| |
| public static String calculateRFC2104HMAC(String data, String key) |
| { |
| try { |
| |
| // get an hmac_sha1 key from the raw key bytes |
| SecretKeySpec signingKey = new SecretKeySpec(key.getBytes(), |
| HMAC_SHA1_ALGORITHM); |
| |
| // get an hmac_sha1 Mac instance and initialize with the signing key |
| Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM); |
| mac.init(signingKey); |
| |
| // compute the hmac on input data bytes |
| byte[] rawHmac = mac.doFinal(data.getBytes()); |
| |
| String result = ""; |
| for (byte b : rawHmac) { |
| result += String.format("%02x", b); |
| } |
| |
| return result; |
| |
| } catch (Exception e) { |
| throw new RuntimeException("Failed to generate HMAC : " |
| + e.getMessage()); |
| } |
| } |
| |
| } |