java 到 python 转换：x509 / dsa / sha1withdsa 加密如何？
我有以下 Java 代码，我正在尝试将其转换为 python，但我不太确定如何执行此操作：
import java.security.spec.X509EncodedKeySpec;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.Signature;
byte[] key = KeyReader.read(filestream)
//KeyReader.read(inputstream) just reads in the bytes 1 at a time from the filestream
X509EncodedKeySpec pubKey = new X509EncodedKeySpec(key);
KeyFactory keyFactory = KeyFactory.getInstance("DSA");
PublicKey pub = keyFactory.generatePublic(pubKey);
Signature signature = Signature.getInstance("SHA1withDSA");
signature.initVerify(pub)
signature.update(a_byte_string) //doesn't matter
我对如何在 python 中执行此操作有点迷失。具体来说，SHA1withDSA 部分。我只是对 python 加密库（确切地说是 m2crypto）了解不够，无法映射函数（我也找不到任何关于如何做到这一点的像样的文章）。
I've got the following Java code that I'm trying to convert to python, and I'm not really sure how to do this:
import java.security.spec.X509EncodedKeySpec;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.Signature;
byte[] key = KeyReader.read(filestream)
//KeyReader.read(inputstream) just reads in the bytes 1 at a time from the filestream
X509EncodedKeySpec pubKey = new X509EncodedKeySpec(key);
KeyFactory keyFactory = KeyFactory.getInstance("DSA");
PublicKey pub = keyFactory.generatePublic(pubKey);
Signature signature = Signature.getInstance("SHA1withDSA");
signature.initVerify(pub)
signature.update(a_byte_string) //doesn't matter
I'm kinda lost as to how to do this in python. Specifically, the SHA1withDSA part. I just don't know enough about the python crypto libs (m2crypto to be exact) to map the functions (nor could I find any decent writeups on how to do this).
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我不太明白Java代码，但这就是你想要做的吗？
I don't exactly understand the Java code, but is this what you are trying to do?