import java.security.Provider;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**
 * Created by free宇  2017/7/27. 11:44
 * author:free宇
 * email:[email protected]
 * describe: AES加密演算法
 
 
*/

public class AesUtils {
    /**
     * @param
     * @return AES加密演算法加密
     * @throws Exception
     */
    public static String encrypt(String seed, String key)
            throws Exception {
        byte[] rawKey = getRawKey(key.getBytes());
        byte[] result = encrypt(seed.getBytes("utf-8"), rawKey);
        
 
return toHex(result);
    }

    public static byte[] encryptByte(String seed, String key)
            throws Exception {
        byte[] rawKey = getRawKey(key.getBytes());
        return encrypt(seed.getBytes("utf-8"), rawKey);
    }


    public static String decryptString(byte[] byteData, byte[] byteKey) throws
 
 Exception {
        byte[] rawKey = getRawKey(byteKey);
        byte[] result = decrypt(byteData, rawKey);
        return new String(result, "UTF8");
    }


    /***
     * AES加密演算法加密
     * @param byteData 資料
     * @param byteKey key
     * @return
     * @throws Exception
     */
    private static byte[] encrypt(byte[] byteData, byte[] byteKey) throws Exception {
        return Ase(byteData, byteKey, Cipher.ENCRYPT_MODE);
    }

    /***
     * AES加密演算法解密
     * @param byteData 資料
     * @param byteKey key
     * @return
     * @throws Exception
     */
    private static byte[] decrypt(byte[] byteData, byte[] byteKey) throws Exception {
        return Ase(byteData, byteKey, Cipher.DECRYPT_MODE);
    }


    /***
     *
     * @param byteData
     * @param byteKey
     * @param opmode
     * @return
     * @throws Exception
     */
    private static byte[] Ase(byte[] byteData, byte[] byteKey, int opmode) throws Exception {
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        SecretKeySpec skeySpec = new SecretKeySpec(byteKey, "AES");
        cipher.init(opmode, skeySpec);
        byte[] decrypted = cipher.doFinal(byteData);
        return decrypted;
    }

    private static byte[] getRawKey(byte[] seed) throws Exception {
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        SecureRandom sr = null;
        int sdk_version = android.os.Build.VERSION.SDK_INT;
        if (sdk_version > 23) {  // Android  6.0 以上
            sr = SecureRandom.getInstance("SHA1PRNG", new CryptoProvider());
        } else if (sdk_version >= 17) {
            sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
        } else {
            sr = SecureRandom.getInstance("SHA1PRNG");
        }
        sr.setSeed(seed);
        kgen.init(128, sr); // 192 and 256 bits may not be available
        SecretKey skey = kgen.generateKey();
        byte[] raw = skey.getEncoded();
        return raw;
    }


    public static class CryptoProvider extends Provider {
        /**
         * Creates a Provider and puts parameters
         */
        public CryptoProvider() {
            super("Crypto", 1.0, "HARMONY (SHA1 digest; SecureRandom; SHA1withDSA signature)");
            put("SecureRandom.SHA1PRNG",
                    "org.apache.harmony.security.provider.crypto.SHA1PRNG_SecureRandomImpl");
            put("SecureRandom.SHA1PRNG ImplementedIn", "Software");
        }
    }


    private static String toHex(byte[] buf) {
        final String HEX = "0123456789ABCDEF";
        if (buf == null)
            return "";
        StringBuffer result = new StringBuffer(2 * buf.length);
        for (int i = 0; i < buf.length; i++) {
            result.append(HEX.charAt((buf[i] >> 4) & 0x0f)).append(
                    HEX.charAt(buf[i] & 0x0f));
        }
        return result.toString();
    }

    private static byte[] toByte(String hexString) {
        int len = hexString.length() / 2;
        byte[] result = new byte[len];
        for (int i = 0; i < len; i++)
            result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2),
                    16).byteValue();
        return result;
    }
}

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;


public class Base64 {
    private static final char[] legalChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
            .toCharArray();

    public static String encode(byte[] data) {
        int start = 0;
        int len = data.length;
        StringBuffer buf = new StringBuffer(data.length * 3 / 2);

        int end = len - 3;
        int i = start;
        int n = 0;

        while (i <= end) {
            int d = ((((int) data[i]) & 0x0ff) << 16)
                    | ((((int) data[i + 1]) & 0x0ff) << 8)
                    | (((int) data[i + 2]) & 0x0ff);

            buf.append(legalChars[(d >> 18) & 63]);
            buf.append(legalChars[(d >> 12) & 63]);
            buf.append(legalChars[(d >> 6) & 63]);
            buf.append(legalChars[d & 63]);

            i += 3;

            if (n++ >= 14) {
                n = 0;
                buf.append(" ");
            }
        }

        if (i == start + len - 2) {
            int d = ((((int) data[i]) & 0x0ff) << 16)
                    | ((((int) data[i + 1]) & 255) << 8);

            buf.append(legalChars[(d >> 18) & 63]);
            buf.append(legalChars[(d >> 12) & 63]);
            buf.append(legalChars[(d >> 6) & 63]);
            buf.append("=");
        } else if (i == start + len - 1) {
            int d = (((int) data[i]) & 0x0ff) << 16;

            buf.append(legalChars[(d >> 18) & 63]);
            buf.append(legalChars[(d >> 12) & 63]);
            buf.append("==");
        }

        return buf.toString();
    }

    private static int decode(char c) {
        if (c >= 'A' && c <= 'Z')
            return ((int) c) - 65;
        else if (c >= 'a' && c <= 'z')
            return ((int) c) - 97 + 26;
        else if (c >= '0' && c <= '9')
            return ((int) c) - 48 + 26 + 26;
        else
            switch (c) {
            case '+':
                return 62;
            case '/':
                return 63;
            case '=':
                return 0;
            default:
                throw new RuntimeException("unexpected code: " + c);
            }
    }

    /**
     * Decodes the given Base64 encoded String to a new byte array. The byte
     * array holding the decoded data is returned.
     */

    public static byte[] decode(String s) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try {
            decode(s, bos);
        } catch (IOException e) {
            throw new RuntimeException();
        }
        byte[] decodedBytes = bos.toByteArray();
        try {
            bos.close();
            bos = null;
        } catch (IOException ex) {
            System.err.println("Error while decoding BASE64: " + ex.toString());
        }
        return decodedBytes;
    }

    private static void decode(String s, OutputStream os) throws IOException {
        int i = 0;

        int len = s.length();

        while (true) {
            while (i < len && s.charAt(i) <= ' ')
                i++;

            if (i == len)
                break;

            int tri = (decode(s.charAt(i)) << 18)
                    + (decode(s.charAt(i + 1)) << 12)
                    + (decode(s.charAt(i + 2)) << 6)
                    + (decode(s.charAt(i + 3)));

            os.write((tri >> 16) & 255);
            if (s.charAt(i + 2) == '=')
                break;
            os.write((tri >> 8) & 255);
            if (s.charAt(i + 3) == '=')
                break;
            os.write(tri & 255);

            i += 4;
        }
    }
}

也可以用android 自帶的base64工具類

android.util.Base64.encode(byteMi,android.util.Base64.DEFAULT); //編碼

android.util.Base64.decode(miData,android.util.Base64.DEFAULT); //解碼

專案要求介面普通介面用base64 重要介面用base64(aes(data,key)) 進行加密