From b11d78d8a02361aff481c8227d6aa864aa08d562 Mon Sep 17 00:00:00 2001 From: Zhanty Date: Thu, 15 Aug 2019 18:00:59 +0800 Subject: [PATCH] optimize utils --- .../utils/security/AESCipherStrategy.java | 10 +- .../utils/security/{util => }/AESUtils.java | 44 +++---- .../utils/security/DESCipherStrategy.java | 6 +- .../utils/security/{util => }/DESUtils.java | 18 ++- .../android/base/utils/security/MD5Utils.java | 67 +++++++++++ .../utils/security/RSACipherStrategy.java | 4 +- .../utils/security/{util => }/RSAUtils.java | 64 +++------- .../android/base/utils/security/SHAUtils.java | 32 +++++ .../base/utils/security/SimpleRsa.java | 5 +- .../base/utils/security/util/MD5Util.java | 113 ------------------ 10 files changed, 151 insertions(+), 212 deletions(-) rename lib_base/src/main/java/com/android/base/utils/security/{util => }/AESUtils.java (79%) rename lib_base/src/main/java/com/android/base/utils/security/{util => }/DESUtils.java (86%) create mode 100644 lib_base/src/main/java/com/android/base/utils/security/MD5Utils.java rename lib_base/src/main/java/com/android/base/utils/security/{util => }/RSAUtils.java (85%) create mode 100644 lib_base/src/main/java/com/android/base/utils/security/SHAUtils.java delete mode 100644 lib_base/src/main/java/com/android/base/utils/security/util/MD5Util.java diff --git a/lib_base/src/main/java/com/android/base/utils/security/AESCipherStrategy.java b/lib_base/src/main/java/com/android/base/utils/security/AESCipherStrategy.java index 9cfa9c7..f9ce0a5 100644 --- a/lib_base/src/main/java/com/android/base/utils/security/AESCipherStrategy.java +++ b/lib_base/src/main/java/com/android/base/utils/security/AESCipherStrategy.java @@ -1,7 +1,5 @@ package com.android.base.utils.security; -import com.android.base.utils.security.util.AESUtils; - import java.io.UnsupportedEncodingException; /** @@ -28,15 +26,15 @@ public class AESCipherStrategy extends CipherStrategy { @Override public String decrypt(String encryptContent) { - byte[] encrypByte = decodeConvert(encryptContent); - byte[] decryptByte = AESUtils.decryptData(encrypByte, key); + byte[] encryptByte = decodeConvert(encryptContent); + byte[] decryptByte = AESUtils.decryptData(encryptByte, key); String result = ""; try { result = new String(decryptByte, CHARSET); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } - return result; } -} + +} \ No newline at end of file diff --git a/lib_base/src/main/java/com/android/base/utils/security/util/AESUtils.java b/lib_base/src/main/java/com/android/base/utils/security/AESUtils.java similarity index 79% rename from lib_base/src/main/java/com/android/base/utils/security/util/AESUtils.java rename to lib_base/src/main/java/com/android/base/utils/security/AESUtils.java index c75275d..32fe918 100644 --- a/lib_base/src/main/java/com/android/base/utils/security/util/AESUtils.java +++ b/lib_base/src/main/java/com/android/base/utils/security/AESUtils.java @@ -14,9 +14,9 @@ * limitations under the License. */ -package com.android.base.utils.security.util; +package com.android.base.utils.security; -import java.io.UnsupportedEncodingException; +import java.nio.charset.StandardCharsets; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; @@ -25,10 +25,11 @@ import javax.crypto.spec.SecretKeySpec; * AES 对称加密 */ public class AESUtils { + /** * 算法/模式/填充 * */ - private static final String CipherMode = "AES"; + private static final String CIPHER_MODE = "AES"; /** * 创建密钥 @@ -38,7 +39,7 @@ public class AESUtils { * @return SecretKeySpec 实例 */ private static SecretKeySpec generateAESKey(String password) { - byte[] data = null; + byte[] data; StringBuilder sb = new StringBuilder(); sb.append(password); while (sb.length() < 16) @@ -46,8 +47,8 @@ public class AESUtils { if (sb.length() > 16) sb.setLength(16); try { - data = sb.toString().getBytes("UTF-8"); - return new SecretKeySpec(data, "AES"); + data = sb.toString().getBytes(StandardCharsets.UTF_8); + return new SecretKeySpec(data, CIPHER_MODE); } catch (Exception e) { e.printStackTrace(); return null; @@ -64,10 +65,9 @@ public class AESUtils { public static byte[] encryptData(byte[] content, String password) { try { SecretKeySpec key = generateAESKey(password); - Cipher cipher = Cipher.getInstance(CipherMode); + Cipher cipher = Cipher.getInstance(CIPHER_MODE); cipher.init(Cipher.ENCRYPT_MODE, key); - byte[] result = cipher.doFinal(content); - return result; + return cipher.doFinal(content); } catch (Exception e) { e.printStackTrace(); } @@ -84,13 +84,12 @@ public class AESUtils { public static String encryptData(String content, String password) { byte[] data = null; try { - data = content.getBytes("UTF-8"); + data = content.getBytes(StandardCharsets.UTF_8); } catch (Exception e) { e.printStackTrace(); } data = encryptData(data, password); - String result = byte2hex(data); - return result; + return byte2hex(data); } /** @@ -103,7 +102,7 @@ public class AESUtils { public static byte[] decryptData(byte[] content, String password) { try { SecretKeySpec key = generateAESKey(password); - Cipher cipher = Cipher.getInstance(CipherMode); + Cipher cipher = Cipher.getInstance(CIPHER_MODE); cipher.init(Cipher.DECRYPT_MODE, key); return cipher.doFinal(content); } catch (Exception e) { @@ -126,26 +125,21 @@ public class AESUtils { if (data == null) return null; String result = null; - try { - result = new String(data, "UTF-8"); - } catch (UnsupportedEncodingException e) { - e.printStackTrace(); - } + result = new String(data, StandardCharsets.UTF_8); return result; } /** * 字节数组转成16进制字符串 * - * @param b * @return 16进制字符串 */ - public static String byte2hex(byte[] b) { // 一个字节的数， - StringBuffer sb = new StringBuffer(b.length * 2); - String tmp = ""; - for (int n = 0; n < b.length; n++) { + public static String byte2hex(byte[] bytes) { // 一个字节的数， + StringBuilder sb = new StringBuilder(bytes.length * 2); + String tmp; + for (byte theByte : bytes) { // 整数转成十六进制表示 - tmp = (Integer.toHexString(b[n] & 0XFF)); + tmp = (Integer.toHexString(theByte & 0XFF)); if (tmp.length() == 1) { sb.append("0"); } @@ -155,7 +149,7 @@ public class AESUtils { } /** - * 将hex字符串转换成字节数组 * + * 将hex字符串转换成字节数组 * * @param inputString 16进制的字符串 * @return 字节数组 diff --git a/lib_base/src/main/java/com/android/base/utils/security/DESCipherStrategy.java b/lib_base/src/main/java/com/android/base/utils/security/DESCipherStrategy.java index 10e48a3..116ce4f 100644 --- a/lib_base/src/main/java/com/android/base/utils/security/DESCipherStrategy.java +++ b/lib_base/src/main/java/com/android/base/utils/security/DESCipherStrategy.java @@ -1,8 +1,6 @@ package com.android.base.utils.security; -import com.android.base.utils.security.util.DESUtils; - import java.io.UnsupportedEncodingException; /** @@ -32,8 +30,8 @@ public class DESCipherStrategy extends CipherStrategy { @Override public String decrypt(String encryptContent) { - byte[] encrypByte = decodeConvert(encryptContent); - byte[] decryptByte = DESUtils.decrypt(encrypByte, key); + byte[] encryptByte = decodeConvert(encryptContent); + byte[] decryptByte = DESUtils.decrypt(encryptByte, key); String result = ""; try { result = new String(decryptByte, CHARSET); diff --git a/lib_base/src/main/java/com/android/base/utils/security/util/DESUtils.java b/lib_base/src/main/java/com/android/base/utils/security/DESUtils.java similarity index 86% rename from lib_base/src/main/java/com/android/base/utils/security/util/DESUtils.java rename to lib_base/src/main/java/com/android/base/utils/security/DESUtils.java index dd06852..53334dd 100644 --- a/lib_base/src/main/java/com/android/base/utils/security/util/DESUtils.java +++ b/lib_base/src/main/java/com/android/base/utils/security/DESUtils.java @@ -14,7 +14,7 @@ * limitations under the License. */ -package com.android.base.utils.security.util; +package com.android.base.utils.security; import java.security.SecureRandom; @@ -23,9 +23,7 @@ import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; -/** - * Created by Administrator on 2015/11/11. - */ +@SuppressWarnings("WeakerAccess") public class DESUtils { /** @@ -33,7 +31,6 @@ public class DESUtils { * * @param bytesContent 待加密内容 * @param key 加密的密钥 - * @return */ public static byte[] encrypt(byte[] bytesContent, String key) { try { @@ -43,8 +40,7 @@ public class DESUtils { SecretKey securekey = keyFactory.generateSecret(desKey); Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.ENCRYPT_MODE, securekey, random); - byte[] result = cipher.doFinal(bytesContent); - return result; + return cipher.doFinal(bytesContent); } catch (Throwable e) { e.printStackTrace(); } @@ -56,20 +52,20 @@ public class DESUtils { * * @param content 待解密内容 * @param key 解密的密钥 - * @return */ public static byte[] decrypt(byte[] content, String key) { try { SecureRandom random = new SecureRandom(); DESKeySpec desKey = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); - SecretKey securekey = keyFactory.generateSecret(desKey); + SecretKey secretKey = keyFactory.generateSecret(desKey); Cipher cipher = Cipher.getInstance("DES"); - cipher.init(Cipher.DECRYPT_MODE, securekey, random); + cipher.init(Cipher.DECRYPT_MODE, secretKey, random); return cipher.doFinal(content); } catch (Throwable e) { e.printStackTrace(); } return null; } -} + +} \ No newline at end of file diff --git a/lib_base/src/main/java/com/android/base/utils/security/MD5Utils.java b/lib_base/src/main/java/com/android/base/utils/security/MD5Utils.java new file mode 100644 index 0000000..074f138 --- /dev/null +++ b/lib_base/src/main/java/com/android/base/utils/security/MD5Utils.java @@ -0,0 +1,67 @@ +package com.android.base.utils.security; + +import java.io.FileInputStream; +import java.io.InputStream; +import java.nio.charset.StandardCharsets; +import java.security.MessageDigest; +import java.security.NoSuchAlgorithmException; + +public class MD5Utils { + + private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; + + private static String toHexString(byte[] bytes) { + StringBuilder sb = new StringBuilder(bytes.length * 2); + for (byte b : bytes) { + sb.append(HEX_DIGITS[(b & 0xf0) >>> 4]); + sb.append(HEX_DIGITS[b & 0x0f]); + } + return sb.toString(); + } + + /** + * 文件加密 + */ + public static String md5file(String filename) { + InputStream fis; + byte[] buffer = new byte[1024]; + int numRead = 0; + MessageDigest md5; + try { + fis = new FileInputStream(filename); + md5 = MessageDigest.getInstance("MD5"); + while ((numRead = fis.read(buffer)) > 0) { + md5.update(buffer, 0, numRead); + } + fis.close(); + return toHexString(md5.digest()); + } catch (Exception e) { + System.out.println("error"); + return null; + } + } + + /** + * 字符串加密 + */ + public static String md5(String string) { + byte[] hash; + try { + hash = MessageDigest.getInstance("MD5").digest(string.getBytes(StandardCharsets.UTF_8)); + } catch (NoSuchAlgorithmException e) { + throw new RuntimeException("Huh, MD5 should be supported?", e); + } + + StringBuilder hex = new StringBuilder(hash.length * 2); + + for (byte b : hash) { + if ((b & 0xFF) < 0x10) { + hex.append("0"); + } + hex.append(Integer.toHexString(b & 0xFF)); + } + + return hex.toString(); + } + +} \ No newline at end of file diff --git a/lib_base/src/main/java/com/android/base/utils/security/RSACipherStrategy.java b/lib_base/src/main/java/com/android/base/utils/security/RSACipherStrategy.java index 99490b6..50b6ca2 100644 --- a/lib_base/src/main/java/com/android/base/utils/security/RSACipherStrategy.java +++ b/lib_base/src/main/java/com/android/base/utils/security/RSACipherStrategy.java @@ -1,7 +1,5 @@ package com.android.base.utils.security; -import com.android.base.utils.security.util.RSAUtils; - import java.io.InputStream; import java.security.PrivateKey; import java.security.PublicKey; @@ -67,4 +65,4 @@ public class RSACipherStrategy extends CipherStrategy { return new String(decryptByte); } -} +} \ No newline at end of file diff --git a/lib_base/src/main/java/com/android/base/utils/security/util/RSAUtils.java b/lib_base/src/main/java/com/android/base/utils/security/RSAUtils.java similarity index 85% rename from lib_base/src/main/java/com/android/base/utils/security/util/RSAUtils.java rename to lib_base/src/main/java/com/android/base/utils/security/RSAUtils.java index 8b72374..f3b081b 100644 --- a/lib_base/src/main/java/com/android/base/utils/security/util/RSAUtils.java +++ b/lib_base/src/main/java/com/android/base/utils/security/RSAUtils.java @@ -14,7 +14,7 @@ * limitations under the License. */ -package com.android.base.utils.security.util; +package com.android.base.utils.security; import android.util.Base64; @@ -39,16 +39,14 @@ import javax.crypto.Cipher; /** * @author Mr.Zheng - * @date 2014年8月22日 下午1:44:23 */ public final class RSAUtils { + private final static String KEY_PAIR = "RSA"; private final static String CIPHER = "RSA/ECB/PKCS1Padding"; /** * 随机生成RSA密钥对(默认密钥长度为1024) - * - * @return */ public static KeyPair generateRSAKeyPair() { return generateRSAKeyPair(1024); @@ -57,9 +55,7 @@ public final class RSAUtils { /** * 随机生成RSA密钥对 * - * @param keyLength 密钥长度，范围：512～2048
- * 一般1024 - * @return + * @param keyLength 密钥长度，范围：512～2048，一般1024 */ public static KeyPair generateRSAKeyPair(int keyLength) { try { @@ -98,7 +94,6 @@ public final class RSAUtils { * * @param encryptedData 经过encryptedData()加密返回的byte数据 * @param privateKey 私钥 - * @return */ public static byte[] decryptData(byte[] encryptedData, PrivateKey privateKey) { try { @@ -113,8 +108,6 @@ public final class RSAUtils { /** * 通过公钥byte[](publicKey.getEncoded())将公钥还原，适用于RSA算法 * - * @param keyBytes - * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException */ @@ -122,15 +115,12 @@ public final class RSAUtils { InvalidKeySpecException { X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_PAIR); - PublicKey publicKey = keyFactory.generatePublic(keySpec); - return publicKey; + return keyFactory.generatePublic(keySpec); } /** * 通过私钥byte[]将公钥还原，适用于RSA算法 * - * @param keyBytes - * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException */ @@ -138,16 +128,12 @@ public final class RSAUtils { InvalidKeySpecException { PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_PAIR); - PrivateKey privateKey = keyFactory.generatePrivate(keySpec); - return privateKey; + return keyFactory.generatePrivate(keySpec); } /** * 使用N、e值还原公钥 * - * @param modulus - * @param publicExponent - * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException */ @@ -157,27 +143,21 @@ public final class RSAUtils { BigInteger bigIntPrivateExponent = new BigInteger(publicExponent); RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus, bigIntPrivateExponent); KeyFactory keyFactory = KeyFactory.getInstance(KEY_PAIR); - PublicKey publicKey = keyFactory.generatePublic(keySpec); - return publicKey; + return keyFactory.generatePublic(keySpec); } /** * 使用N、d值还原私钥 * - * @param modulus - * @param privateExponent - * @return * @throws NoSuchAlgorithmException * @throws InvalidKeySpecException */ - public static PrivateKey getPrivateKey(String modulus, String privateExponent) - throws NoSuchAlgorithmException, InvalidKeySpecException { + public static PrivateKey getPrivateKey(String modulus, String privateExponent) throws NoSuchAlgorithmException, InvalidKeySpecException { BigInteger bigIntModulus = new BigInteger(modulus); BigInteger bigIntPrivateExponent = new BigInteger(privateExponent); RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus, bigIntPrivateExponent); KeyFactory keyFactory = KeyFactory.getInstance(KEY_PAIR); - PrivateKey privateKey = keyFactory.generatePrivate(keySpec); - return privateKey; + return keyFactory.generatePrivate(keySpec); } /** @@ -203,12 +183,7 @@ public final class RSAUtils { } /** - * 从字符串中加载私钥
- * 加载时使用的是PKCS8EncodedKeySpec（PKCS#8编码的Key指令）。 - * - * @param privateKeyStr - * @return - * @throws Exception + * 从字符串中加载私钥，加载时使用的是PKCS8EncodedKeySpec（PKCS#8编码的Key指令）。 */ public static PrivateKey loadPrivateKey(String privateKeyStr) throws Exception { try { @@ -244,10 +219,6 @@ public final class RSAUtils { /** * 从文件中加载私钥 - * - * @param - * @return 是否成功 - * @throws Exception */ public static PrivateKey loadPrivateKey(InputStream in) throws Exception { try { @@ -261,28 +232,25 @@ public final class RSAUtils { /** * 读取密钥信息 + * + * 
      * --------------------
      * CONTENT
      * --------------------
-     *
-     * @param in
-     * @return
-     * @throws IOException
+     *
*/ private static String readKey(InputStream in) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(in)); - String readLine = null; + String readLine; StringBuilder sb = new StringBuilder(); while ((readLine = br.readLine()) != null) { if (readLine.charAt(0) == '-') { continue; - } else { - sb.append(readLine); - sb.append('\r'); } + sb.append(readLine); + sb.append('\r'); } - return sb.toString(); } -} +} \ No newline at end of file diff --git a/lib_base/src/main/java/com/android/base/utils/security/SHAUtils.java b/lib_base/src/main/java/com/android/base/utils/security/SHAUtils.java new file mode 100644 index 0000000..b8622ec --- /dev/null +++ b/lib_base/src/main/java/com/android/base/utils/security/SHAUtils.java @@ -0,0 +1,32 @@ +package com.android.base.utils.security; + +import java.nio.charset.StandardCharsets; +import java.security.MessageDigest; +import java.security.NoSuchAlgorithmException; + +/** + * @author Ztiany + * Email: ztiany3@gmail.com + * Date : 2019-08-15 14:50 + */ +@SuppressWarnings("WeakerAccess") +public class SHAUtils { + + private static final String SHA256 = "SHA256"; + + public static byte[] toSHA256(String content) { + return toSHA256(content.getBytes(StandardCharsets.UTF_8)); + } + + public static byte[] toSHA256(byte[] bytes) { + try { + MessageDigest md = MessageDigest.getInstance(SHA256); + md.update(bytes); + return md.digest(); + } catch (NoSuchAlgorithmException e) { + e.printStackTrace(); + } + return null; + } + +} diff --git a/lib_base/src/main/java/com/android/base/utils/security/SimpleRsa.java b/lib_base/src/main/java/com/android/base/utils/security/SimpleRsa.java index c8c43c1..3a95a0d 100644 --- a/lib_base/src/main/java/com/android/base/utils/security/SimpleRsa.java +++ b/lib_base/src/main/java/com/android/base/utils/security/SimpleRsa.java @@ -5,6 +5,7 @@ import android.util.Base64; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.InputStream; +import java.nio.charset.StandardCharsets; import java.security.KeyFactory; import java.security.NoSuchAlgorithmException; import java.security.NoSuchProviderException; @@ -45,7 +46,7 @@ public class SimpleRsa { PublicKey pubKey = getPublicKeyFromX509(ALGORITHM, RSA_PUBLIC_KEY); Cipher cipher = Cipher.getInstance(TRANSFORMATION); cipher.init(Cipher.ENCRYPT_MODE, pubKey); - byte plaintext[] = content.getBytes("UTF-8"); + byte[] plaintext = content.getBytes(StandardCharsets.UTF_8); byte[] output = cipher.doFinal(plaintext); return new String(Base64.encode(output, Base64.DEFAULT)); } catch (Exception e) { @@ -78,7 +79,7 @@ public class SimpleRsa { } writer.write(cipher.doFinal(block)); } - return new String(writer.toByteArray(), "utf-8"); + return new String(writer.toByteArray(), StandardCharsets.UTF_8); } catch (Exception e) { return null; } diff --git a/lib_base/src/main/java/com/android/base/utils/security/util/MD5Util.java b/lib_base/src/main/java/com/android/base/utils/security/util/MD5Util.java deleted file mode 100644 index fad4e41..0000000 --- a/lib_base/src/main/java/com/android/base/utils/security/util/MD5Util.java +++ /dev/null @@ -1,113 +0,0 @@ -package com.android.base.utils.security.util; - -import java.security.MessageDigest; -import java.security.NoSuchAlgorithmException; - -public class MD5Util { - - private final static String[] strDigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"}; - - private static String byteToArrayString(byte bByte) { - int iRet = bByte; - if (iRet < 0) { - iRet += 256; - } - int iD1 = iRet / 16; - int iD2 = iRet % 16; - return strDigits[iD1] + strDigits[iD2]; - } - - private static String byteToString(byte[] bByte) { - StringBuilder sBuffer = new StringBuilder(); - for (byte aBByte : bByte) { - sBuffer.append(byteToArrayString(aBByte)); - } - return sBuffer.toString(); - } - - /** - * 32 位 MD5加密 - * - * @param str 待加密的字符串 - * @return result - */ - public static String encrypt(String str) { - String result = null; - try { - result = str; - MessageDigest md = MessageDigest.getInstance("MD5"); - result = byteToString(md.digest(str.getBytes())); - } catch (NoSuchAlgorithmException ex) { - ex.printStackTrace(); - } - return result; - } - - - public static String encrypt(String algorithm, String str) { - try { - MessageDigest md = MessageDigest.getInstance(algorithm); - md.update(str.getBytes()); - StringBuilder sb = new StringBuilder(); - byte[] bytes = md.digest(); - for (int i = 0; i < bytes.length; i++) { - int b = bytes[i] & 0xFF; - if (b < 0x10) { - sb.append('0'); - } - sb.append(Integer.toHexString(b)); - } - return sb.toString(); - } catch (Exception e) { - return ""; - } - } - - public static String hashKeyForDisk(String key) { - String cacheKey; - try { - final MessageDigest mDigest = MessageDigest.getInstance("MD5"); - mDigest.update(key.getBytes()); - cacheKey = bytesToHexString(mDigest.digest()); - } catch (NoSuchAlgorithmException e) { - cacheKey = String.valueOf(key.hashCode()); - } - return cacheKey; - } - - private static String bytesToHexString(byte[] bytes) { - StringBuilder sb = new StringBuilder(); - for (int i = 0; i < bytes.length; i++) { - String hex = Integer.toHexString(0xFF & bytes[i]); - if (hex.length() == 1) { - sb.append('0'); - } - sb.append(hex); - } - return sb.toString(); - } - - - public static String getMd5Value(String secret) { - try { - MessageDigest bmd5 = MessageDigest.getInstance("MD5"); - bmd5.update(secret.getBytes()); - int i; - StringBuffer buf = new StringBuffer(); - byte[] b = bmd5.digest(); - for (int offset = 0; offset < b.length; offset++) { - i = b[offset]; - if (i < 0) - i += 256; - if (i < 16) - buf.append("0"); - buf.append(Integer.toHexString(i)); - } - return buf.toString(); - } catch (NoSuchAlgorithmException e) { - e.printStackTrace(); - } - return ""; - } - -}