如何将Byte数组转换为PrivateKey或PublicKey类型？ [英] How to convert Byte array to PrivateKey or PublicKey type?

问题描述

我使用RSA算法生成公钥和私钥

I am using RSA algorithm to generate public and private key

final KeyPairGenerator keyGen = KeyPairGenerator.getInstance(ALGORITHM);
keyGen.initialize(1024);
final KeyPair key = keyGen.generateKeyPair();
final PrivateKey privateKey=key.getPrivate();
final PublicKey publickey=key.getPublic();

之后，使用Base64编码器对这些密钥进行编码并将其保存到数据库中。

after that these keys are encoded using Base64 encoder and save it into database.

如何在java中将此编码的字符串转换为私有和公钥类型是解密文件。使用Base64Decoder解码此字符串时
将获得一个字节数组。如何将此Byte数组转换为公钥或私钥类型？

How to convert this encoded String to Private and Public Key Type in java is to decrypt file. when decoding this String using Base64Decoder will get a byte array. how to convert this Byte array to public or private key type?

推荐答案

如果你有一个byte []代表getEncoded的输出（）在一个键上，你可以使用KeyFactory将它转回一个PublicKey对象或一个PrivateKey对象。

If you have a byte[] representing the output of getEncoded() on a key, you can use KeyFactory to turn that back into a PublicKey object or a PrivateKey object.

byte[] privateKeyBytes;
byte[] publicKeyBytes;
KeyFactory kf = KeyFactory.getInstance("RSA"); // or "EC" or whatever
PrivateKey privateKey = kf.generatePrivate(new PKCS8EncodedKeySpec(privateKeyBytes));
PublicKey publicKey = kf.generatePublic(new X509EncodedKeySpec(publicKeyBytes));

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