Java 从 KeyPair 对象中检索公钥的实际值

Question

我想问如何从 KeyPair 对象中检索私钥和公钥的实际值，因为我需要导出它们并保存在数据库中。

KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024);
KeyPair keyPair = kpg.genKeyPair();

System.out.println("Public key " + keyPair.getPublic());
System.out.println("Private key " + keyPair.getPrivate());

输出为:

Public key Sun RSA public key, 1024 bits
  modulus: 105712092415375085805423498639048173422142354311030811647243014925610093650322108853068042919471115278002432342007597147610508132502035047888382465733153739247741208519707861808073276783311634229563965825609200080862631487160732889423591650215084096832366499080850540875321197564283324922935557797293830551071
  public exponent: 65537
Private key sun.security.rsa.RSAPrivateCrtKeyImpl@35e71

Answer 1

您可以简单地向下转换为 RSAPrivateKey 和 RSAPublicKey。完成后，您可以访问这些类的方法。

RSAPublicKey pubKey = (RSAPublicKey) keyPair.getPublic());
BigInteger modulus = pubKey.getModulus();

等等