signature.verify() 在 java 中返回 false

Question

首先，我看到其他帖子也有这个问题，但没有人遇到和我一样的问题，即 signature.verify() 意外返回 false。

这是我的代码：

private static String encriptar(String xmlSolicitud, PrivateKey privateKey)
        throws Exception {

    Signature signature=Signature.getInstance("SHA1withRSA");
    signature.initSign(privateKey);
    signature.update(xmlSolicitud.getBytes(Charset.forName("UTF-8")));
    byte[] signatureValue = signature.sign();
    String response = Base64.encode(signatureValue);
    signature.initVerify(keyReader.publicKeyRead(Reference.rutaPublicKeyTest));
    System.out.println(signature.verify(signatureValue));
    return response;
}

下面是我读取密钥的方式（如果需要）：

public static PrivateKey privateKeyRead(String filename)
        throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {

    File f = new File(filename);
    FileInputStream fis = new FileInputStream(f);
    DataInputStream dis = new DataInputStream(fis);
    byte[] keyBytes = new byte[(int)f.length()];
    dis.readFully(keyBytes);
    dis.close();

    PKCS8EncodedKeySpec spec =
                new PKCS8EncodedKeySpec(keyBytes);
    KeyFactory kf = KeyFactory.getInstance("RSA");
    return kf.generatePrivate(spec);
}

public static PublicKey publicKeyRead(String filename)
        throws Exception {

    File f = new File(filename);
    FileInputStream fis = new FileInputStream(f);
    DataInputStream dis = new DataInputStream(fis);
    byte[] keyBytes = new byte[(int)f.length()];
    dis.readFully(keyBytes);
    dis.close();

    X509EncodedKeySpec spec =
                new X509EncodedKeySpec(keyBytes);
    KeyFactory kf = KeyFactory.getInstance("RSA");
    return kf.generatePublic(spec);
}

Answer 1

签名状态在您调用 sign 后重置。根据 documentation:

A call to this method resets this signature object to the state it was in when previously initialized for signing via a call to initSign(PrivateKey). That is, the object is reset and available to generate another signature from the same signer, if desired, via new calls to update and sign.

您需要使用已签名的字节再次更新签名：

private static String encriptar(String xmlSolicitud, PrivateKey privateKey)
        throws Exception {

    Signature signature=Signature.getInstance("SHA1withRSA");
    signature.initSign(privateKey);
    signature.update(xmlSolicitud.getBytes(Charset.forName("UTF-8")));

    byte[] signatureValue = signature.sign();
    String response = Base64.encode(signatureValue);

    signature.initVerify(keyReader.publicKeyRead(Reference.rutaPublicKeyTest));
    signature.update(xmlSolicitud.getBytes(Charset.forName("UTF-8"))); // <-- Here

    System.out.println(signature.verify(signatureValue)); // <-- Will print true

    return response;
}

附带说明一下，您似乎正在签署 XML 内容。使用 XML signatures 以避免被规范化问题绊倒可能是明智的。

signature.verify() 在 java 中返回 false

signature.verify() is returning false in java

java

security

rsa

digital-signature

sha1