block, _ := pem.Decode(csrBytes)
	if block == nil {
		return nil, fmt.Errorf("certificate signing request is not properly encoded")
	}
	csr, err := x509.ParseCertificateRequest(block.Bytes)
	if err != nil {
		return nil, fmt.Errorf("failed to parse X.509 certificate signing request")
	}
	return csr, nil
}

		SignatureAlgorithm: algorithmIdentifier,
		SignatureValue:     asn1.BitString{Bytes: signature, BitLength: len(signature) * 8},
	})
}

// ParseCertificateRequest parses a single certificate request from the
// given ASN.1 DER data.
func ParseCertificateRequest(asn1Data []byte) (*CertificateRequest, error) {
	var csr certificateRequest

	rest, err := asn1.Unmarshal(asn1Data, &csr)
	if err != nil {

	}

	if block.Type != certutil.CertificateRequestBlockType {
		return nil, errors.Errorf("expected block type %q, but PEM had type %q", certutil.CertificateRequestBlockType, block.Type)
	}

	return x509.ParseCertificateRequest(block.Bytes)
}

// CertificateRequestFromFile returns the CertificateRequest from a given PEM-encoded file.
// Returns an error if the file could not be read or if the CSR could not be parsed.

func TestDuplicateExtensionsCSR(t *testing.T) {
	b, _ := pem.Decode([]byte(dupExtCSR))
	if b == nil {
		t.Fatalf("couldn't decode test CSR")
	}
	_, err := ParseCertificateRequest(b.Bytes)
	if err == nil {
		t.Fatal("ParseCertificateRequest should fail when parsing CSR with duplicate extensions")
	}
}

const dupAttCSR = `-----BEGIN CERTIFICATE REQUEST-----

		{"PEMCipherAES128", Const, 1},
		{"PEMCipherAES192", Const, 1},
		{"PEMCipherAES256", Const, 1},
		{"PEMCipherDES", Const, 1},
		{"ParseCRL", Func, 0},
		{"ParseCertificate", Func, 0},
		{"ParseCertificateRequest", Func, 3},
		{"ParseCertificates", Func, 0},
		{"ParseDERCRL", Func, 0},
		{"ParseECPrivateKey", Func, 1},
		{"ParsePKCS1PrivateKey", Func, 0},
		{"ParsePKCS1PublicKey", Func, 10},