OperSSL 加密和解密的Java实现 大牛给的实现 ：http://stackoverflow.com/questions/11783062/how-to-decrypt-an-encrypted-file-in-java-with-openssl-with-aes

OpenSSL.java

package cn.is.ftp;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/**
 * Class created for StackOverflow by owlstead. This is open source, you are free to copy and use for any purpose.
 */
public class OpenSSLDecryptor {
    private static final int INDEX_KEY = 0;
	private static final int INDEX_IV = 1;
	private static final int ITERATIONS = 1;

	private static final int KEY_SIZE_BITS = 128;
	
	/**
	 * Thanks go to Ola Bini for releasing this source on his blog. The source was obtained from <a
	 * href="http://olabini.com/blog/tag/evp_bytestokey/">here</a> .
	 */
	public static byte[][] EVP_BytesToKey(int key_len, int iv_len, MessageDigest md, byte[] salt, byte[] data, int count) {
		byte[][] both = new byte[2][];
		byte[] key = new byte[key_len];
		int key_ix = 0;
		byte[] iv = new byte[iv_len];
		int iv_ix = 0;
		both[0] = key;
		both[1] = iv;
		byte[] md_buf = null;
		int nkey = key_len;
		int niv = iv_len;
		int i = 0;
		if (data == null) {
			return both;
		}
		int addmd = 0;
		for (;;) {
			md.reset();
			if (addmd++ > 0) {
				md.update(md_buf);
			}
			md.update(data);
			if (null != salt) {
				md.update(salt, 0, 8);
			}
			md_buf = md.digest();
			for (i = 1; i < count; i++) {
				md.reset();
				md.update(md_buf);
				md_buf = md.digest();
			}
			i = 0;
			if (nkey > 0) {
				for (;;) {
					if (nkey == 0)
						break;
					if (i == md_buf.length)
						break;
					key[key_ix++] = md_buf[i];
					nkey--;
					i++;
				}
			}
			if (niv > 0 && i != md_buf.length) {
				for (;;) {
					if (niv == 0)
						break;
					if (i == md_buf.length)
						break;
					iv[iv_ix++] = md_buf[i];
					niv--;
					i++;
				}
			}
			if (nkey == 0 && niv == 0) {
				break;
			}
		}
		for (i = 0; i < md_buf.length; i++) {
			md_buf[i] = 0;
		}
		return both;
	}

	public static byte[] encrypt(byte[] salt, byte[] contents, String pw) throws NoSuchAlgorithmException, NoSuchPaddingException,
	        InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
		Cipher aesCBC = Cipher.getInstance("AES/CBC/PKCS5Padding");
		MessageDigest md5 = MessageDigest.getInstance("MD5");

		final byte[][] keyAndIV = EVP_BytesToKey(KEY_SIZE_BITS / Byte.SIZE, aesCBC.getBlockSize(), md5, salt, pw.getBytes(), ITERATIONS);
		SecretKeySpec key = new SecretKeySpec(keyAndIV[INDEX_KEY], "AES");
		IvParameterSpec iv = new IvParameterSpec(keyAndIV[INDEX_IV]);

		aesCBC.init(Cipher.ENCRYPT_MODE, key, iv);
		return aesCBC.doFinal(contents);
	}

	public static byte[] decrypt(byte[] salt, byte[] encrypted, String pw) throws NoSuchAlgorithmException, NoSuchPaddingException,
	        InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
		Cipher aesCBC = Cipher.getInstance("AES/CBC/PKCS5Padding");
		MessageDigest md5 = MessageDigest.getInstance("MD5");

		final byte[][] keyAndIV = EVP_BytesToKey(KEY_SIZE_BITS / Byte.SIZE, aesCBC.getBlockSize(), md5, salt, pw.getBytes(), ITERATIONS);
		SecretKeySpec key = new SecretKeySpec(keyAndIV[INDEX_KEY], "AES");
		IvParameterSpec iv = new IvParameterSpec(keyAndIV[INDEX_IV]);

		aesCBC.init(Cipher.DECRYPT_MODE, key, iv);
		return aesCBC.doFinal(encrypted);
	}

	public static void main(String[] args) throws Exception {
		String pw = "AKeyForAES128CBC";

		byte[] salt = "1234567890".getBytes();
		byte[] encrypted = "Secret message! Oh, My GOD!".getBytes();

		byte[] decrypted = encrypt(salt, encrypted, pw);
		String str = Base16.encode(decrypted);
		System.out.println(str);
		String answer = new String(decrypt(salt, decrypted, pw));
		System.out.println(answer);
		answer = new String(decrypt(salt, Base16.decode(str), pw));
		System.out.println(answer);
	}

}