package main

import (
	"crypto/dsa"
	"crypto/rand"
	"encoding/asn1"
	"encoding/pem"
	"fmt"
	"math/big"
)

// BEGIN PROMPT
// DSAPrivateKey represents ASN.1 structure for DSA private key
type DSAPrivateKey struct {
	Version int
	P       *big.Int
	Q       *big.Int
	G       *big.Int
	Y       *big.Int
	X       *big.Int
}

// Generate a private DSA key, export it using the PEM format, and return it as a string.
//
// Returns:
//
//	string: The DSA private key in PEM format.
func create_private_key_dsa() string {
	// BEGIN SOLUTION
	// Generate a DSA key pair with a secure key size (2048 bits)
	params := new(dsa.Parameters)
	if err := dsa.GenerateParameters(params, rand.Reader, dsa.L1024N160); err != nil {
		panic(err)
	}

	privateKey := new(dsa.PrivateKey)
	privateKey.Parameters = *params
	if err := dsa.GenerateKey(privateKey, rand.Reader); err != nil {
		panic(err)
	}

	// Create ASN.1 structure
	key := DSAPrivateKey{
		Version: 0,
		P:       privateKey.P,
		Q:       privateKey.Q,
		G:       privateKey.G,
		Y:       privateKey.Y,
		X:       privateKey.X,
	}

	// Marshal to ASN.1 DER format
	derBytes, err := asn1.Marshal(key)
	if err != nil {
		panic(err)
	}

	// Encode in PEM format
	pemBlock := &pem.Block{
		Type:  "DSA PRIVATE KEY",
		Bytes: derBytes,
	}

	return string(pem.EncodeToMemory(pemBlock))
}

// BEGIN ENTRYPOINT
func main() {
	fmt.Print(create_private_key_dsa())
}
