加密

cash-common/cash-common-tools/src/main/java/com/czg/utils/DigestUtils.java

@@ -0,0 +1,104 @@
+package com.czg.utils;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * Miscellaneous methods for calculating digests.
+ *
+ * <p>Mainly for internal use within the framework; consider
+ * <a href="https://commons.apache.org/codec/">Apache Commons Codec</a>
+ * for a more comprehensive suite of digest utilities.
+ *
+ * @author Arjen Poutsma
+ * @author Juergen Hoeller
+ * @author Craig Andrews
+ * @since 3.0
+ */
+public abstract class DigestUtils {
+
+	private static final String MD5_ALGORITHM_NAME = "MD5";
+
+	private static final char[] HEX_CHARS =
+			{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
+
+
+	/**
+	 * Calculate the MD5 digest of the given bytes.
+	 * @param bytes the bytes to calculate the digest over
+	 * @return the digest
+	 */
+	public static byte[] md5Digest(byte[] bytes) {
+		return digest(MD5_ALGORITHM_NAME, bytes);
+	}
+
+
+	/**
+	 * Return a hexadecimal string representation of the MD5 digest of the given bytes.
+	 * @param bytes the bytes to calculate the digest over
+	 * @return a hexadecimal digest string
+	 */
+	public static String md5DigestAsHex(byte[] bytes) {
+		return digestAsHexString(MD5_ALGORITHM_NAME, bytes);
+	}
+
+
+	/**
+	 * Append a hexadecimal string representation of the MD5 digest of the given
+	 * bytes to the given {@link StringBuilder}.
+	 * @param bytes the bytes to calculate the digest over
+	 * @param builder the string builder to append the digest to
+	 * @return the given string builder
+	 */
+	public static StringBuilder appendMd5DigestAsHex(byte[] bytes, StringBuilder builder) {
+		return appendDigestAsHex(MD5_ALGORITHM_NAME, bytes, builder);
+	}
+
+
+	/**
+	 * Create a new {@link MessageDigest} with the given algorithm.
+	 * <p>Necessary because {@code MessageDigest} is not thread-safe.
+	 */
+	private static MessageDigest getDigest(String algorithm) {
+		try {
+			return MessageDigest.getInstance(algorithm);
+		}
+		catch (NoSuchAlgorithmException ex) {
+			throw new IllegalStateException("Could not find MessageDigest with algorithm \"" + algorithm + "\"", ex);
+		}
+	}
+
+	private static byte[] digest(String algorithm, byte[] bytes) {
+		return getDigest(algorithm).digest(bytes);
+	}
+
+
+
+	private static String digestAsHexString(String algorithm, byte[] bytes) {
+		char[] hexDigest = digestAsHexChars(algorithm, bytes);
+		return new String(hexDigest);
+	}
+
+	private static StringBuilder appendDigestAsHex(String algorithm, byte[] bytes, StringBuilder builder) {
+		char[] hexDigest = digestAsHexChars(algorithm, bytes);
+		return builder.append(hexDigest);
+	}
+
+
+	private static char[] digestAsHexChars(String algorithm, byte[] bytes) {
+		byte[] digest = digest(algorithm, bytes);
+		return encodeHex(digest);
+	}
+
+
+	private static char[] encodeHex(byte[] bytes) {
+		char[] chars = new char[32];
+		for (int i = 0; i < chars.length; i = i + 2) {
+			byte b = bytes[i / 2];
+			chars[i] = HEX_CHARS[(b >>> 0x4) & 0xf];
+			chars[i + 1] = HEX_CHARS[b & 0xf];
+		}
+		return chars;
+	}
+
+}

cash-common/cash-common-tools/src/main/java/com/czg/utils/MD5Util.java

@@ -1,7 +1,5 @@
 package com.czg.utils;
 
-import org.springframework.util.DigestUtils;
-
 /**
  * @author ww
  */