我是加密概念的新手。我正在开发一个小项目,我需要使用AES128算法加密内容。接收器需要64位加密密钥进行解密 但是,我认为密钥是在基于String的AES128中生成的。那么如何生成一个64位的解密密钥呢?
我的代码如下所示
public class AESencrp {
private static final String ALGO = "AES";
private static byte[] keyValue = {};
public static String encrypt(String Data, Key key) throws Exception {
System.out.println("Key Encryp ============="
+ new String(key.getEncoded()));
System.out.println("\n\n key in Enc ==========>" + key.getEncoded());
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.ENCRYPT_MODE, key);
byte[] encVal = c.doFinal(Data.getBytes());
byte encryptedValue[] = new Base64().encode(encVal);
return new String(encryptedValue);
}
public static String decrypt(String encryptedData, Key key)
throws Exception {
System.out.println("Key Decryp ============="
+ new String(key.getEncoded()));
System.out.println("\n\n key in Dec ==========>" + key.getEncoded());
Cipher c = Cipher.getInstance(ALGO);
c.init(Cipher.DECRYPT_MODE, key);
byte[] decordedValue = new Base64().decode(encryptedData.getBytes());
byte[] decValue = c.doFinal(decordedValue);
String decryptedValue = new String(decValue);
return decryptedValue;
}
public static void main(String[] args) throws Exception {
try {
String sPrivateKey = "privateKey";
keyValue = sPrivateKey.getBytes();
MessageDigest sha = MessageDigest.getInstance("SHA-1");
keyValue = sha.digest(keyValue);
keyValue = Arrays.copyOf(keyValue, 16); // use only first 128 bit
} catch (Exception e) {
e.printStackTrace();
}
Key key = new SecretKeySpec(keyValue, ALGO);
System.out.println("\n\n key in GK ==========>" + key.getEncoded());
System.out.println("\n\n key in GK ==========>"
+ new String(key.getEncoded()));
String password = "mypassword";
String passwordEnc = encrypt(password, key);
String passwordDec = decrypt(passwordEnc, key);
System.out.println("Plain Text : " + password);
System.out.println("Encrypted Text : " + passwordEnc);
System.out.println("Decrypted Text : " + passwordDec);
}
}
,结果如下,
key in GK ==========>[B@a90653
key in Enc ==========>[B@de6ced
key in Dec ==========>[B@e80a59
Plain Text : mypassword
Encrypted Text : mBhBCUOlJbOBEaBl/42TZQ==
Decrypted Text : mypassword
我需要与接收器分享哪一个?任何人都可以帮助我吗?
答案 0 :(得分:0)
AES是一种对称加密算法。因此,对于加密和解密,密钥是相同的。所以,你不要生成"解密的关键,你需要"有"它
对于密钥传输,您可以使用RSA algorithm
(或任何其他非对称密钥算法)。您需要在两侧都具有相同的关键组件。在您的情况下,有一个组件,即String (="privateKey")
。因此,您需要告诉传输此组件,我建议使用非对称加密。
加密" privateKey"使用可以使用私钥解密的公钥。然后,使用此组件生成AES密钥。
详细了解RSA算法here