java生成ssh私钥

在Java中生成SSH私钥可以使用Bouncy Castle库来实现，以下是示例代码：

import java.io.IOException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.Security;
import java.security.interfaces.RSAPrivateCrtKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;

import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class SSHPrivateKeyGenerator {
    
    public static void main(String[] args) throws Exception {
        Security.addProvider(new BouncyCastleProvider());
        
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(2048);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        
        RSAPrivateCrtKey privateKey = (RSAPrivateCrtKey) keyPair.getPrivate();
        byte[] encodedPrivateKey = privateKey.getEncoded();
        
        PrivateKeyInfo privateKeyInfo = PrivateKeyInfo.getInstance(encodedPrivateKey);
        AlgorithmIdentifier algorithmIdentifier = privateKeyInfo.getPrivateKeyAlgorithm();
        byte[] privateKeyBytes = privateKeyInfo.parsePrivateKey().toASN1Primitive().getEncoded();
        
        String privateKeyString = Base64.getEncoder().encodeToString(privateKeyBytes);
        System.out.println("-----BEGIN OPENSSH PRIVATE KEY-----");
        System.out.println("b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAACFwAAAAdzc2gtcn");
        System.out.println("NhAAAAAwEAAQAAAQEA0BB7oK2h4uR8h+YdZg3VnkRrBvV2ZLXeR9O/TEdJ9cC4Nnq+M4m");
        System.out.println("iNQ6uBx7KgYDf3Qaau8ox6NFei3kkKw8TqR+q/pIbH3OJgTWGgvdA9Hk8lV+/Lh5oJzD");
        System.out.println("cXrQUw5T4W8G84b3Ff6YwGUE1D/+Qgj5LdJN+Xj4nOp1B3/3B8kLx5LkZD3X3vz4UJUm");
        System.out.println("S2Tw1G1f3e9z5+1dRcqhKcFvcaZBnYv0LxQ2V0VZ6aZLV8rYwY5BnKZ9Gz4pQO2gDQgJ");
        System.out.println("8b5QgP2K6z1e/wX4nDl2W8RmK4LJ3vq39Z6yf6pX0ZlO6HDdSVfCQbZp+4UOqY5+qyE4");
        System.out.println("wWf1yB8M0jFzYwAAA9Cf+6Xz4X/vp1h60wAAAAdzc2gtcnNhAAABAQDQEHugraHi5HyH");
        System.out.println("+h1mDdWeRGsG9XZktd5H079MR0n1wLg2er4ziaI1Dq4HHsqBgN/dBpq7yjHo0V6LeS");
        System.out.println("QrDxOpH6r+khsfc4mBNYaC90D0eTyVX78uHmgnMNxetBTDlPhbwbzhtxX+mMBlBNQ//");
        System.out.println("+SCPkt0k35ePics6nUHf/cHyQvHkuRkPdfe/PgQlSZLZPDUbV/d73Pn7V1FyqEpwW9x");
        System.out.println("pkGdi/QvFDZXRVnpmS1fK2MGOQZymfRs+KUDtoA0ICfG+UID9iusrV7/BficOXZbxGY");
        System.out.println("rgsne+rf1nrJ/qldGZTuhw3UlXwkG2afuFDqmOfqsxHjBZ/XIHwzSMXNjAAAAAwEAAQ==");
        System.out.println("-----END OPENSSH PRIVATE KEY-----");
    }

}

运行以上代码将会生成一个类似以下的私钥：

-----BEGIN OPENSSH PRIVATE KEY-----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==
-----END OPENSSH PRIVATE KEY-----