ASN1.parse() error

[pedroserretti]

I'm doing a function that i'm signing a XML.
Before i was testing with the same certificate, and it does successfully.

Now, i'm doing some tests, but unfortunally, when i test with another certificate, it occurs a new error, in ASN1.parse function.
Can anyone help me with this??

static Future<(bool, String)> assinarDocumento(String sCertificadoConteudo, String sSenhaCertificado, String sTagAssinar, String arquivoXml, String sXmlString) async {
    bool responseOk = true;
    String sCert = "";
    String sMensagem = "";
    Uint8List chaveBytes;
    // Uint8List certBytes;

    XmlDocument document = XmlDocument.parse(sXmlString);
    document.normalize(trimAllWhitespace: true);
    Iterable<XmlElement> tagElements = document.findAllElements(sTagAssinar);

    switch (tagElements.length) {
      case 0:
        sMensagem = "A tag a ser assinada não existe.";
        return (!responseOk, sMensagem);
      case 1:
        try {
          (chaveBytes, sCert) = await FNfeNfceGerais.extrairChavePrivadaCertificado(sCertificadoConteudo, sSenhaCertificado);

          SignedXml sig = SignedXml()
            ..signatureAlgorithm = "http://www.w3.org/2000/09/xmldsig#rsa-sha1"
            ..canonicalizationAlgorithm = "http://www.w3.org/TR/2001/REC-xml-c14n-20010315"
            ..addReference(
              "//*[local-name()='$sTagAssinar']",
              ["http://www.w3.org/2000/09/xmldsig#enveloped-signature", "http://www.w3.org/TR/2001/REC-xml-c14n-20010315"],
            )
            ..signingKey = chaveBytes;
          sig.computeSignature(document.toXmlString());

          XmlDocument newDocument = XmlDocument.parse(sig.signedXml);

          XmlElement keyInfo = XmlElement(XmlName('KeyInfo'), [], [
            XmlElement(XmlName('X509Data'), [], [
              XmlElement(XmlName('X509Certificate'), [], [XmlText(sCert.replaceAll("-----BEGIN CERTIFICATE-----", "").replaceAll("-----END CERTIFICATE-----", "").replaceAll(RegExp(r'\s+'), "").trim())]),
            ]),
          ]);

          XmlElement signatureNode = newDocument.findAllElements("Signature").first;
          signatureNode.children.add(keyInfo);

          await File(arquivoXml).writeAsString(newDocument.toXmlString(pretty: true));
          return (responseOk, "O Xml foi assinado com sucesso.");
        } catch (e, stacktrace) {
          return (!responseOk, "Erro: $e\n Stack Trace: $stacktrace");
        }
      default:
        return (!responseOk, "Existe mais de uma tag a ser assinada.");
    }
  }

static Future<(Uint8List, String)> extrairChavePrivadaCertificado(String sCertificadoConteudo, String sSenhaCertificado) async {
    String sCert = "";
    Uint8List? chaveBytes;
    Uint8List certBytes = base64Decode(sCertificadoConteudo);
    List<String> results = Pkcs12Utils.parsePkcs12(certBytes, password: FGeral.descriptografarTexto(sSenhaCertificado, tlAsc: false));

    for (String conteudo in results) {
      if (conteudo.contains("PRIVATE KEY")) {
        // chaveBytes = conteudo.codeUnits;
        conteudo = conteudo.replaceAll("-----BEGIN PRIVATE KEY-----", "").replaceAll("-----END PRIVATE KEY-----", "").replaceAll("\n", "").replaceAll("\r", "");
        Uint8List x = utf8.encode("-----BEGIN PRIVATE KEY-----");
        Uint8List y = FGeral.stringToUint8List(conteudo);
        Uint8List z = utf8.encode("-----END PRIVATE KEY-----");
        chaveBytes = Uint8List.fromList(x + y + z);
      }
      if (conteudo.contains("CERTIFICATE")) {
        sCert = conteudo;
        // certBytes = utf8.encode(conteudo);
      }
    }
    return (chaveBytes ?? Uint8List(0), sCert);
  }

That's my CallStack:

#0 ASN1Object.parse (package:ninja_asn1/src/ninja_asn1_base.dart:120:9)
#1 ASN1Sequence.parse (package:ninja_asn1/src/ninja_asn1_base.dart:211:33)
#2 new ASN1Sequence.decode (package:ninja_asn1/src/ninja_asn1_base.dart:180:70)
#3 new RSAPrivateKey.fromASN1 (package:ninja/asymmetric/rsa/rsa.dart:271:32)
#4 new RSAPrivateKey.fromPEM (package:ninja/asymmetric/rsa/rsa.dart:325:26)
#5 RSASHA1.getSignature (package:xml_crypto/src/signed_xml.dart:980:31)
#6 SignedXml._calculateSignatureValue (package:xml_crypto/src/signed_xml.dart:291:16)
#7 SignedXml.computeSignature (package:xml_crypto/src/signed_xml.dart:659:7)
#8 FNfeNfceGerais.assinarDocumento (package:vip12/funcoes/nfeNfce/fNfeNfceGerais.dart:67:15)
e: UnimplementedError
message: null

That's urgent, please, someone help me, i need answers!

[scribetw]

It seems your RSA private key is not valid in PEM format.

I suggest checking chaveBytes first, maybe something was wrong.

import 'dart:convert';

print(utf8.decode(chaveBytes));

And it should be like the following in text form:

-----BEGIN PRIVATE KEY-----
MIICdwIBADA....(omitted)
-----END PRIVATE KEY-----

[pedroserretti]

It seems your RSA private key is not valid in PEM format.

I suggest checking chaveBytes first, maybe something was wrong.

import 'dart:convert';

print(utf8.decode(chaveBytes));

And it should be like the following in text form:

-----BEGIN PRIVATE KEY-----
MIICdwIBADA....(omitted)
-----END PRIVATE KEY-----

Hi, thanks for the reply!

My certificate look like this:

Can i send you my certificate with my private key and my sign code?
In private or an email?

PS:
The byte when the problem occurs is "160"
#0 ASN1Object.parse (package:ninja_asn1/src/ninja_asn1_base.dart:120:9)

Maybe this can help.

Thanks in advance.

[pedroserretti]

It seems your RSA private key is not valid in PEM format.

I suggest checking chaveBytes first, maybe something was wrong.

import 'dart:convert';

print(utf8.decode(chaveBytes));

And it should be like the following in text form:

-----BEGIN PRIVATE KEY-----
MIICdwIBADA....(omitted)
-----END PRIVATE KEY-----

Another information for you.

I checked my certificate at:
https://www.sslshopper.com/certificate-key-matcher.html

https://www.sslshopper.com/certificate-decoder.html

[scribetw]

Hi, since the stack trace shows the error is from ninja and ninja_asn1, I suggest you go to their issue tracker to post an issue instead.

Thanks.