如何在python中创建PKCS8 RSA签名 [英] how to make a PKCS8 RSA signature in python

问题描述

我有pkcs8_rsa_private_key文件，通过openssl从rsa_private_key.pem文件生成。

I have pkcs8_rsa_private_key file which generate by openssl from a rsa_private_key.pem file.

我需要通过python中的私钥进行签名，使相同的签名与以下java代码。

I need make a signature by the private key in python, make the same signature with below java code.

public static final String SIGN_ALGORITHMS = "SHA1WithRSA";

public static String sign(String content, String privateKey) {
    String charset = "utf-8";
    try {
        PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(
                Base64.decode(privateKey));
        KeyFactory keyf = KeyFactory.getInstance("RSA");
        PrivateKey priKey = keyf.generatePrivate(priPKCS8);

        java.security.Signature signature = java.security.Signature
                .getInstance(SIGN_ALGORITHMS);

        signature.initSign(priKey);
        signature.update(content.getBytes(charset));

        byte[] signed = signature.sign();

        return Base64.encode(signed);
    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;
}

推荐答案

PKCS＃8定义了一种方式编码和传输密钥，它不是OpenSSL特有的; PKCS＃1定义了一种使用RSA密钥的方法（无论如何加载到您的应用程序中，使用PKCS＃8）来执行和验证数据上的数字签名。

PKCS#8 defines a way to encode and transport secret keys and it is not specific to OpenSSL; PKCS#1 defines a way to use an RSA key (no matter how it was loaded into your application, with PKCS#8 or not) to carry out and verify digital signature on data.

这段代码有三件事：

1. 它将Base64解码成PKCS＃8


2. 它将PKCS＃8解码成内存中的实际密钥（您可能需要在此处提供密码）


3. 它使用SHA-1执行PKCS＃1 v1.5签名使用所述密钥


4. 它在Base64中编码签名

1. It decodes Base64 into PKCS#8
2. It decodes PKCS#8 into the actual key in memory (mind you may need to provide a passphrase here)
3. It performs PKCS#1 v1.5 signature using SHA-1 using said key
4. It encodes the signature in Base64

PKCS＃1 v1.5的例子，用于签名PyCrypto的API 确实步骤＃2和＃3。

The example for PKCS#1 v1.5 signing in the API of PyCrypto does exactly steps #2 and #3.

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