Android AES加密 ecb模式加密

╰半橙微兮° 2022-12-06 12:49 236阅读 0赞

### Android AES加密 ==ecb模式加密 ###

下面有两套代码都可以实现

##### 第一套 #####

import javax.crypto.Cipher;
    import javax.crypto.spec.SecretKeySpec;
    import android.util.Base64;
    
    public class AESECB { 
    
        // 加密
        public static String Encrypt(String sSrc, String sKey) throws Exception { 
            if (sKey == null) { 
                System.out.print("Key为空null");
                return null;
            }
            // 判断Key是否为16位
            if (sKey.length() != 16) { 
                System.out.print("Key长度不是16位");
                return null;
            }
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
            byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
    
    // return new Base64().encodeToString(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。
            return Base64.encodeToString(encrypted, Base64.DEFAULT);
        }
    
        // 解密
        public static String Decrypt(String sSrc, String sKey) throws Exception { 
            try { 
                // 判断Key是否正确
                if (sKey == null) { 
                    System.out.print("Key为空null");
                    return null;
                }
                // 判断Key是否为16位
                if (sKey.length() != 16) { 
                    System.out.print("Key长度不是16位");
                    return null;
                }
                byte[] raw = sKey.getBytes("utf-8");
                SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
                Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
                cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    // byte[] encrypted1 = new Base64().decode(sSrc);//先用base64解密
                byte[] encrypted1 = Base64.decode(sSrc.getBytes("UTF-8"), Base64.DEFAULT);
                try { 
                    byte[] original = cipher.doFinal(encrypted1);
                    String originalString = new String(original,"utf-8");
                    return originalString;
                } catch (Exception e) { 
                    System.out.println(e.toString());
                    return null;
                }
            } catch (Exception ex) { 
                System.out.println(ex.toString());
                return null;
            }
        }
    
        public static void main(String[] args) throws Exception { 
            /* * 此处使用AES-128-ECB加密模式，key需要为16位。 */
            // 需要加密的字串
            String sKey = "key值key值key值";
            String cSrc = "Linsk123456_ecb模式";
            System.out.println(cSrc);
            // 加密
            String enString = AESECB.Encrypt(cSrc, sKey);
            System.out.println("加密后的字串是：" + enString);
    
            // 解密
            String DeString = AESECB.Decrypt(enString, sKey);
            System.out.println("解密后的字串是：" + DeString);
        }
    }

执行代码，生成字符串末尾带"\\n"，需要替换掉

String sKey = "key值key值key值";
    AESECB.Encrypt("待加密字符串", sKey).replaceAll("\r|\n", "")

##### 第二套 #####

import android.util.Base64;
    import java.io.UnsupportedEncodingException;
    import javax.crypto.Cipher;
    import javax.crypto.spec.SecretKeySpec;
    
    /** * AES加密解密工具 * * @author huangxiaoguo */
    public class AESUtils { 
    
        public static String encrypt(String sSrc, String sKey){ 
            String rts = "";
            try { 
                byte[] data = sSrc.getBytes("utf-8");
                byte[] key = sKey.getBytes("utf-8");
                byte[] encrypted = encrypt(data, key);
                rts = Base64.encodeToString(encrypted, Base64.DEFAULT);
            } catch (UnsupportedEncodingException e) { 
                e.printStackTrace();
            }
            return rts;
        }
    
        public static String decrypt(String sSrc, String sKey) { 
            String rts = "";
            try { 
                byte[] raw = sKey.getBytes("utf-8");
                byte[] encrypted1 = Base64.decode(sSrc.getBytes("UTF-8"), Base64.DEFAULT);
                byte[] original = decrypt(encrypted1, raw);
                rts = new String(original,"utf-8");
            } catch (UnsupportedEncodingException e) { 
                e.printStackTrace();
            }
            return rts;
        }
    
        /** * AES加密 * * @param data * 将要加密的内容 * @param key * 密钥 * @return 已经加密的内容 */
        public static byte[] encrypt(byte[] data, byte[] key) { 
            //不足16字节，补齐内容为差值
            int len = 16 - data.length % 16;
            for (int i = 0; i < len; i++) { 
                byte[] bytes = {  (byte) len };
                data = ArrayUtils.concat(data, bytes);
            }
            try { 
                SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
                Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
                cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
                return cipher.doFinal(data);
            } catch (Exception e) { 
                e.printStackTrace();
            }
            return new byte[] { };
        }
    
        /** * AES解密 * * @param data * 将要解密的内容 * @param key * 密钥 * @return 已经解密的内容 */
        public static byte[] decrypt(byte[] data, byte[] key) { 
            data = ArrayUtils.noPadding(data, -1);
            try { 
                SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
                Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
                cipher.init(Cipher.DECRYPT_MODE, skeySpec);
                byte[] decryptData = cipher.doFinal(data);
                int len = 2 + ByteUtils.byteToInt(decryptData[4]) + 3;
                return ArrayUtils.noPadding(decryptData, len);
            } catch (Exception e) { 
                e.printStackTrace();
            }
            return new byte[] { };
        }
    }

ArrayUtils

/** * 数组工具 * * @author huangxiaoguo */  
    public class ArrayUtils {   
    
        /** * 合并数组 * * @param firstArray * 第一个数组 * @param secondArray * 第二个数组 * @return 合并后的数组 */  
        public static byte[] concat(byte[] firstArray, byte[] secondArray) {   
            if (firstArray == null || secondArray == null) {   
                return null;  
            }  
            byte[] bytes = new byte[firstArray.length + secondArray.length];  
            System.arraycopy(firstArray, 0, bytes, 0, firstArray.length);  
            System.arraycopy(secondArray, 0, bytes, firstArray.length,  
                    secondArray.length);  
            return bytes;  
        }  
    
        /** * 去除数组中的补齐 * * @param paddingBytes * 源数组 * @param dataLength * 去除补齐后的数据长度 * @return 去除补齐后的数组 */  
        public static byte[] noPadding(byte[] paddingBytes, int dataLength) {   
            if (paddingBytes == null) {   
                return null;  
            }  
    
            byte[] noPaddingBytes = null;  
            if (dataLength > 0) {   
                if (paddingBytes.length > dataLength) {   
                    noPaddingBytes = new byte[dataLength];  
                    System.arraycopy(paddingBytes, 0, noPaddingBytes, 0, dataLength);  
                } else {   
                    noPaddingBytes = paddingBytes;  
                }  
            } else {   
                int index = paddingIndex(paddingBytes);  
                if (index > 0) {   
                    noPaddingBytes = new byte[index];  
                    System.arraycopy(paddingBytes, 0, noPaddingBytes, 0, index);  
                }  
            }  
    
            return noPaddingBytes;  
        }  
    
        /** * 获取补齐的位置 * * @param paddingBytes * 源数组 * @return 补齐的位置 */  
        private static int paddingIndex(byte[] paddingBytes) {   
            for (int i = paddingBytes.length - 1; i >= 0; i--) {   
                if (paddingBytes[i] != 0) {   
                    return i + 1;  
                }  
            }  
            return -1;  
        }  
    }

ByteUtils

public class ByteUtils { 
        public static int byteToInt(byte b) { 
            return (b) & 0xff;
        }
    }

执行代码，生成字符串末尾带"\\n"，需要替换掉

String sKey = "key值key值key值";
    AESUtils.encrypt("待加密字符串", sKey).replaceAll("\r|\n", "")

**参考**  
[https://blog.csdn.net/dingweijson/article/details/84920045][https_blog.csdn.net_dingweijson_article_details_84920045]

[https://blog.csdn.net/huangxiaoguo1/article/details/78043098][https_blog.csdn.net_huangxiaoguo1_article_details_78043098]

[https_blog.csdn.net_dingweijson_article_details_84920045]: https://blog.csdn.net/dingweijson/article/details/84920045
[https_blog.csdn.net_huangxiaoguo1_article_details_78043098]: https://blog.csdn.net/huangxiaoguo1/article/details/78043098