相关疑难解决方法(0)

我正在努力验证Azure AD令牌签名。

当我在下面的“ jwks_uri”字段中查找正确的键描述时

https://login.microsoftonline.com/common/.well-known/openid-configuration

我检查所属密钥数据。

我尝试使用“ n”-模数和“ e”字段来生成用于签名验证的公钥，但最终出现错误：

BASE64Decoder decoder = new BASE64Decoder();        
byte[] modulusBytes = decoder.decodeBuffer(n);
byte[] exponentBytes = decoder.decodeBuffer(e);

BigInteger modulusInt = new BigInteger(1, modulusBytes);
BigInteger exponentInt = new BigInteger(1, exponentBytes);

try {
    KeyFactory keyFactory = KeyFactory.getInstance("RSA");
    RSAPublicKeySpec publicSpec = new RSAPublicKeySpec(modulusInt, exponentInt);
RSAPublicKey pubKey = (RSAPublicKey)keyFactory.generatePublic(publicSpec);
Jwt<Header, String> c = Jwts.parser().setSigningKey(pubKey).parsePlaintextJwt(token);

} catch (Exception ex) {
  ex.printStackTrace();
}

安慰：

io.jsonwebtoken.SignatureException: Unable to verify RSA signature using configured PublicKey. Signature length not correct: got 256 but was …