java - Crypto 将代码从 Node js 翻译为 Java

Question

我想检查离线模式下的登录: 我在node js上找到了以下代码

const crypto = require('crypto')
const {
  KEYGEN_PUBLIC_KEY,
  LICENSE_KEY
} = process.env

// Extract key and signature from the license key payload
const [encodedKey, encodedSignature] = LICENSE_KEY.split('.')

// Decode the base64 encoded key
const key = Buffer.from(encodedKey, 'base64').toString()

// Verify the signature
const verifier = crypto.createVerify('sha256')
verifier.write(key)
verifier.end()

const ok = verifier.verify(KEYGEN_PUBLIC_KEY, encodedSignature, 'base64')

之后我尝试在java上重写这段代码

byte[] publicBytes = Base64.getDecoder().decode(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey pubKey = keyFactory.generatePublic(keySpec);

Signature sign = Signature.getInstance("SHA256withRSA");
sign.initVerify(pubKey);
byte[] decode = Base64.getDecoder().decode(signature.getBytes(StandardCharsets.UTF_8));
System.out.println(sign.verify(decode));

但这行不通。异常(exception)是线程“main”java.lang.IllegalArgumentException中的异常:非法base64字符2d 有人能帮我解决这个错误吗？

Answer 1

你能试试下面的代码吗？

byte[] publicBytes = Base64.getDecoder().decode(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicBytes);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey pubKey = keyFactory.generatePublic(keySpec);

MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
messageDigest.update(publicBytes);
byte[] outputDigest = messageDigest.digest();

此后，您可以使用正常的 Base64 解码功能。 您可以引用下面的例子。 https://www.quickprogrammingtips.com/java/how-to-create-sha256-rsa-signature-using-java.html