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Signature calculation VPOS XML API V4.1

Signatures shall be calculated and verified according to documentation https://www.w3.org/TR/xmldsig-core/

Canonicalization method to be used is http://www.w3.org/TR/2001/REC-xml-c14n-20010315

SignatureMethod Algorithm=”http://www.w3.org/2001/04/xmldsig-more#rsa-sha256″

DigestMethod  Algorithm=”http://www.w3.org/2001/04/xmlenc#sha256″

The signed element is Message element referenced with its ID attribute named  messageId.

ID attribute is an attribute which type in schema is defined as xsd:ID.

Messages sent by merchant are signed by merchant private key and verified with merchant certificate.

Messages sent by VPOS service are signed by service provider private key and validated with service provider provided certificate.

XML API plugin example message and signature calculation

Here is an example request message to VPOS and how the signature is calculated.

(used apache santuario)

 

Merchant Private key PKCS8:

—–BEGIN PRIVATE KEY—–

MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDaX7Jd16os2Mti

cXHXGjanQ3fDSwwoRRhVWi12+SiFDMVBpBwZEGdmHopO5cpSGptFxeau7HqGfSaq

5NoI01pbf/OPFpstO4mSlIBj2OO9wzcW2yNeAQjzycEQmgNr1UQACUmXsNzBZZ2m

rcddkdRpxfHPaZx+GIYMdemFY7G0yBXsG0Dq+3hi9kqyGYlAN3PFsqCEdwD3H8qd

5UKz4wKEYhuqhKBZZoGBBUQZt7X9plwdMoZhtqbJIJTpda5Og/yNxkSjiTQrOMnt

vSl5dAQ8dGxoFaKAdvaE09eqt0F6RI76qyUU3B0PKBVB/kIYhvFSvJtef6a8fF4S

y56VOMptAgMBAAECggEBAM9tj1Qsg21OEQNVlzknoTqIj75mDwpBd7e7jOwyCBc5

5jVP2ZDFUDJkWCRRijkrJMrGDTWjU09kmdJCyAkSGgZIJ+aHJqd0ol0lyj8NymZ6

hF2lkpa8jPBleIp4gT9wuMMAD3OTgF4EVBf7giCTYR2H9QV74Da2vL4hUsxtwmNg

2jQjjHTsVA/ESjiyGveh1X6+GV6CsTZsoAWLlOhuDHiOMuOXDBmn9JjArFsl2W4X

yrtrDx68nVdPdIH2LzIrBzqRG6tB9RpNQNWGs/IxuEUG07fLMGzQiureOTUm/ybt

ZrO9Ab59tzWXCFXHljsGJu9SnZuPNOT0L8PuJIxKOIECgYEA9w6hdFaVr0HMnQtX

ndtZQfiqNnQMymV0mR9gtyw20/krOW5yt7WqhrzzTB72m4bsm27Yz3Dn0jfhQ1h5

zyihrT+FGeF6jS6+Hr3FXFyMizxH9AZPl13UmZo1fKxeoL+sE5PppFE9Qlsz0TBp

2phlVjzLI7i3KOu8Hyzt/rafZDkCgYEA4kdFMSHTQGLounpPauKaVi8v9TjyFdST

qSuQ0pMG4R9xuZ0x52L081goYmxo4jDo7P+m3iHDFdJqg+D7aAVay4Hv0PGKIq8G

vOAXm6mnXBaIMDVMnTRtqRynDoo2qKp9UU2Sv4D0L6Zbm9axDxMvqXCa8Lz5Kbnh

zJufUAwzn9UCgYEAkboGkDn2Zv8X81ZaYxmcZ6aGuEHxvXzkruFsSf+Bg71IusKk

ViqJIJrZo//rlMecTv6uUoYVp9EgRXott30PCMMb/q0afaahrD5h6N4KZKK1CoKi

dfV5zvTAMf72fjkxBgdMXIky6i4jvXOiLLeRprGLXVG6cB/EwlrdM06DbDkCgYBc

TdJt3mx8gVyKZUZsRY/LxGf90oL+YL7zbXAgVhWiU99iZjtrNjTR545hx/NpAaai

tw7s4jzgc/s7XNVxc228Qn7/buh4iYloFsnKmARLTm2zrKpaHn71U1jaV4tAdnu0

ZL6OHB6AKY6JHaUQjzUMG4E43v2NBeSUQI9WagPNGQKBgDj5qk4Jauy8zg/IBkXD

eJsgwGrMH7o1vj2Uhcd2K2NrxO3qRaJitNXH+cso836/Ez///kdepX3hQ3gKZS7i

aGhDFF3r0LU2OmskhoDSyhzVlCgsXbW1skFwL3Y161uYHwgpkFqrAODONXLu3PBd

S8jJbKkA3lQnmCCbET3NLfIV

—–END PRIVATE KEY—–

 

Merchant certificate X509:

—–BEGIN CERTIFICATE—–

MIIDuzCCAqOgAwIBAgIJANh5ptk5BWu5MA0GCSqGSIb3DQEBCwUAMHQxCzAJBgNV

BAYTAkVFMREwDwYDVQQIDAhNeSBTdGF0ZTEQMA4GA1UEBwwHbXkgQ2l0eTEVMBMG

A1UECgwMQ29tcGFueSBOYW1lMRAwDgYDVQQLDAc3NzExMjIzMRcwFQYDVQQDDA53

d3cubXlzaXRlLmNvbTAeFw0xNzAzMjkxNzM3MDFaFw0yMTAzMjgxNzM3MDFaMHQx

CzAJBgNVBAYTAkVFMREwDwYDVQQIDAhNeSBTdGF0ZTEQMA4GA1UEBwwHbXkgQ2l0

eTEVMBMGA1UECgwMQ29tcGFueSBOYW1lMRAwDgYDVQQLDAc3NzExMjIzMRcwFQYD

VQQDDA53d3cubXlzaXRlLmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoC

ggEBANpfsl3XqizYy2JxcdcaNqdDd8NLDChFGFVaLXb5KIUMxUGkHBkQZ2Yeik7l

ylIam0XF5q7seoZ9Jqrk2gjTWlt/848Wmy07iZKUgGPY473DNxbbI14BCPPJwRCa

A2vVRAAJSZew3MFlnaatx12R1GnF8c9pnH4Yhgx16YVjsbTIFewbQOr7eGL2SrIZ

iUA3c8WyoIR3APcfyp3lQrPjAoRiG6qEoFlmgYEFRBm3tf2mXB0yhmG2pskglOl1

rk6D/I3GRKOJNCs4ye29KXl0BDx0bGgVooB29oTT16q3QXpEjvqrJRTcHQ8oFUH+

QhiG8VK8m15/prx8XhLLnpU4ym0CAwEAAaNQME4wHQYDVR0OBBYEFJaXNDk3UIJT

7bjuedk13vmz62RjMB8GA1UdIwQYMBaAFJaXNDk3UIJT7bjuedk13vmz62RjMAwG

A1UdEwQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBAJx7UBdBddBbJ8sz/Fa3YvDl

VR/GNTLp/haKC6G+FA97H5u2S7OGgXUnIX2T3M94QllhTykkzfr1zJeDZD+YrYyh

Ayp/ykHL0gk0tumHw8DN1BRmglRMc4QEXXHsx1HnMlcS0uE622M2+IQeDzDtLYpf

XL36Dqoik0hIuNSjlxqlIX4kBweA83Xx9IGyhsMhXHSS0BcPVmup97PTAs81YGOu

7vVgzyLBTHjabRktd0hVdm9+EJ/RMMFTW4XM+Ue2ekFx3uEX2B53ND6Mx5mtP/pi

bQ7/860FXUNdrHbcQCFufqhk7Ikr3+kv+Rqmh5DmrUbblpmXFvm6iLc6uYZqIvE=

—–END CERTIFICATE—–

 

Service provider certificate:

—–BEGIN CERTIFICATE—–

MIID5TCCAo0CBFjeXq8wDQYJKoZIhvcNAQELBQAwdzEoMCYGA1UEAxMfVlBPUyBERU1PIHZwb3Nh

ZG1pbi5tb2RpcnVtLmNvbTENMAsGA1UECxMEVlBPUzEQMA4GA1UEChMHTW9kaXJ1bTEQMA4GA1UE

BxMHVGFsbGlubjELMAkGA1UECBMCSE0xCzAJBgNVBAYTAkVFMB4XDTE3MDMzMTEzNTAzOVoXDTIy

MDkyMTEzNTAzOVowdzEoMCYGA1UEAxMfVlBPUyBERU1PIHZwb3NhZG1pbi5tb2RpcnVtLmNvbTEN

MAsGA1UECxMEVlBPUzEQMA4GA1UEChMHTW9kaXJ1bTEQMA4GA1UEBxMHVGFsbGlubjELMAkGA1UE

CBMCSE0xCzAJBgNVBAYTAkVFMIIBYjANBgkqhkiG9w0BAQEFAAOCAU8AMIIBSgKCAUEAyhFCdFGD

pchDXC7ryDUiMOlRHjce4N9e4hNUZ6+hTshRBTNeHqcTfhxKuiReaC6AVbQEbBYBGCUs8EQAWppK

RIB+ZnTytY8bhJqQ1YuiWvAN5cTBLoS2jE5vxf/Xx/+G+UhjfmK6XM0UKnQ4mR+MKM5/iSgV/Un7

ysHoLLepwefEUBQEODqAIsc6N5pMeeShT/66WEtxEkiXQPn48PXDRLLzSBzB247w03r+92WWrlVe

IMgTQc0kgx2gsgMziiqiUDSB69Bm/ugT81wDcUNklmbo8r3IsxtjOT+/HQ8Qbo4vQpJI7yzIcnvt

6U8Ub5TLjz4UmIBg8y6lY/kbJoxA/4n/M+1MwZqgM7cKGi5lG429A3h/1g2zhQ8bZBexnY5FLW1G

PTCS4ahE67ZYl8CWXjoDAzFtVcdpMDFnvZ6noMkCAwEAATANBgkqhkiG9w0BAQsFAAOCAUEAp0mN

/2Ml6tVC8Zi0bkXJ8j+bUxaxCUU1nV7htzWOqlAsQn1mVb7lbkLZgOc7RfD5CxdLspAVIVU1Gekp

/tSLjbdA3obSlBFmIm5yU4PGN9YjLRi5jbAAJNhJYThFB0YJu4M6tqX0nbxX6GphPeh2ruQ6WzeS

KwUf62gqd96WZeIwAKLoAZng4G9LZNITL7jUgl4OWq9OzZ+JYpe/rSz1tKWAg9r5U/AEkoZasfPo

3MLQlNCTh/WQm8jmtsyglct4k5SNI3ABhFcPfcR0PIhCjTVd7vlY8NcdaxSYYRzQgKZ7N8pdhvi3

NyPZmbu4OJXkc4Fupuyp2YxhGh0AtLKvdPRmybNZCmTRejgGbJeE6LjkcJ2zcunb+LxbyoxJ1DdU

K1tddzVPdH+QK8q3EKBNt0H3KwbRPk9qRmH4xuoX4XA=

—–END CERTIFICATE—–

 

Example code:

JAVA
import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

import javax.xml.transform.stream.StreamSource;

import org.apache.xml.security.keys.KeyInfo;

import org.apache.xml.security.keys.content.X509Data;

import org.apache.xml.security.keys.content.x509.XMLX509Certificate;

import org.apache.xml.security.signature.XMLSignature;

public class Signer{

  public byte[] sign(VPOS root, PrivateKey prik, java.security.cert.X509Certificate[] crts) throws Exception{

    org.w3c.dom.Document dom = apis.marschalToDOM(root);

    // apis.normalizeDOM(dom); dom nomralization is very slow using instead

    // msg.setIdAttribute("messageId", true);

    Element vpos = dom.getDocumentElement();

    XMLSignature xmlsigAp = new XMLSignature(dom, null, "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256", "http://www.w3.org/TR/2001/REC-xml-c14n-20010315");

    Element sigel = xmlsigAp.getElement();

    vpos.appendChild(sigel);

    Element msg = (Element)vpos.getFirstChild();

    // setting id attribute instead of dom normalization

    msg.setIdAttribute("messageId", true);

    xmlsigAp.addDocument("#" + msg.getAttribute("messageId"), null, "http://www.w3.org/2001/04/xmlenc#sha256", null, null);

    for (int i = 0; crts != null && i < crts.length; i++){

      xmlsigAp.addKeyInfo(crts[i]);

    }

    xmlsigAp.sign(prik);

    ByteArrayOutputStream bos = new ByteArrayOutputStream(4096);

    TransformerFactory transfac = TransformerFactory.newInstance();

    Transformer trans = transfac.newTransformer();

    trans.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");

    trans.setOutputProperty(OutputKeys.INDENT, "no");

    trans.setOutputProperty(OutputKeys.ENCODING, "utf-8");

    DOMSource source = new DOMSource(dom);

    trans.transform(source, new StreamResult(bos));

    return bos.toByteArray();

  }

}

 

Example sale request (assume there is no line breaks until end of <Message> part)

XML
<VPOS xmlns="http://www.modirum.com/schemas/vposxmlapi41" xmlns:ns2="http://www.w3.org/2000/09/xmldsig#">
<Message messageId="M1560776270228" timeStamp="2019-06-17T15:57:50.228+03:00" version="4.1">
  <SaleRequest>
    <Authentication>
      <Mid>0000001</Mid>
    </Authentication>
    <OrderInfo>
      <OrderId>1560776235400</OrderId>
      <OrderDesc>Test</OrderDesc>
      <OrderAmount>1.25</OrderAmount>
      <Currency>EUR</Currency>
      <PayerEmail/>
    </OrderInfo>
    <PaymentInfo>
      <PayMethod>visa</PayMethod>
      <CardPan>4016000000002</CardPan>
      <CardExpDate>2206</CardExpDate>
      <CardCvv2>756</CardCvv2>
      <CardHolderName>John Smith</CardHolderName>
    </PaymentInfo>
  </SaleRequest>
</Message>
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
  <ds:SignedInfo> 
    <ds:CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
    <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/> 
    <ds:Reference URI="#M1560776270228">
      <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
      <ds:DigestValue>82t/HCbRKUrAKVsA1tOpU8zXi3wIupTUeBndZ90VALM=</ds:DigestValue>
    </ds:Reference>
  </ds:SignedInfo>
  <ds:SignatureValue>DhADR21OEzIikjwgZh61pibBULtI0iRbkSEt6z2mdVGpQRgI3UFIepkYvTeNZv84cF2jM6JCrFbxdXMIR
  Q643rFXwOAnstv0QyRFPD4XCQDltSfoqDNfjAQE2wXmYWgHGJdI/0Vu12TJ64XzdEhb4E6t8yGfyYL
  6DdXZk4oBRZxBRqGBA6zxyDRdRvLq9V+LGIwZk4J7p6M+wZWDTb50/pOSU2wlP/s4IPtQvZQYWct
  9Huq/sFI+qwAG7na0L25zE9cB467lcaKmgGGLXFrRwDX6xAmoZOwFIW5x0CXbtM2X2j8vH53/Hfh1r
  dsWRxbOs7+ObLYvct/BA6KRbMxBPA==</ds:SignatureValue>
  <ds:KeyInfo>
  <ds:X509Data>
  <ds:X509Certificate>MIIDuzCCAqOgAwIBAgIJANh5ptk5BWu5MA0GCSqGSIb3DQEBCwUAMHQxCzAJBgNVB
  AYTAkVFMREwDwYDVQQIDAhNeSBTdGF0ZTEQMA4GA1UEBwwHbXkgQ2l0eTEVMBMGA1UE
  CgwMQ29tcGFueSBOYW1lMRAwDgYDVQQLDAc3NzExMjIzMRcwFQYDVQQDDA53d3cubXlzaXR
  lLmNvbTAeFw0xNzAzMjkxNzM3MDFaFw0yMTAzMjgxNzM3MDFaMHQxCzAJBgNVBAYTAkVFM
  REwDwYDVQQIDAhNeSBTdGF0ZTEQMA4GA1UEBwwHbXkgQ2l0eTEVMBMGA1UECgwMQ29tc
  GFueSBOYW1lMRAwDgYDVQQLDAc3NzExMjIzMRcwFQYDVQQDDA53d3cubXlzaXRlLmNvbTCC
  ASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBANpfsl3XqizYy2JxcdcaNqdDd8NLDChFGF
  VaLXb5KIUMxUGkHBkQZ2Yeik7lylIam0XF5q7seoZ9Jqrk2gjTWlt/848Wmy07iZKUgGPY473DNxbbI1
  4BCPPJwRCaA2vVRAAJSZew3MFlnaatx12R1GnF8c9pnH4Yhgx16YVjsbTIFewbQOr7eGL2SrIZiUA3c
  8WyoIR3APcfyp3lQrPjAoRiG6qEoFlmgYEFRBm3tf2mXB0yhmG2pskglOl1rk6D/I3GRKOJNCs4ye29K
  Xl0BDx0bGgVooB29oTT16q3QXpEjvqrJRTcHQ8oFUH+QhiG8VK8m15/prx8XhLLnpU4ym0CAwEAA
  aNQME4wHQYDVR0OBBYEFJaXNDk3UIJT7bjuedk13vmz62RjMB8GA1UdIwQYMBaAFJaXNDk3UI
  JT7bjuedk13vmz62RjMAwGA1UdEwQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEBAJx7UBdBddB
  bJ8sz/Fa3YvDlVR/GNTLp/haKC6G+FA97H5u2S7OGgXUnIX2T3M94QllhTykkzfr1zJeDZD+YrYyhAyp
  /ykHL0gk0tumHw8DN1BRmglRMc4QEXXHsx1HnMlcS0uE622M2+IQeDzDtLYpfXL36Dqoik0hIuNSjl
  xqlIX4kBweA83Xx9IGyhsMhXHSS0BcPVmup97PTAs81YGOu7vVgzyLBTHjabRktd0hVdm9+EJ/RMM
  FTW4XM+Ue2ekFx3uEX2B53ND6Mx5mtP/pibQ7/860FXUNdrHbcQCFufqhk7Ikr3+kv+Rqmh5DmrUbb
  lpmXFvm6iLc6uYZqIvE=</ds:X509Certificate>
  </ds:X509Data>
  </ds:KeyInfo>
</ds:Signature>
</VPOS>

Response signed by service provider (assume no line breaks until end of <Message> part)

XML
<VPOS xmlns="http://www.modirum.com/schemas/vposxmlapi41" xmlns:ns2="http://www.w3.org/2000/09/xmldsig#">
<Message messageId="M1560776270228" timeStamp="2019-06-17T15:57:50.502+03:00" version="4.1">
    <SaleResponse>
        <OrderId>1560776235400</OrderId>
        <OrderAmount>1.25</OrderAmount>
        <Currency>EUR</Currency>
        <PaymentTotal>1.25</PaymentTotal>
        <Status>CAPTURED</Status>
        <TxId>927703821</TxId>
        <PaymentRef>104037</PaymentRef>
        <RiskScore>10</RiskScore>
        <Description>OK, CAPTURED response code 00</Description>
        <Attribute name="EXTACQUIRERID">014</Attribute>
    </SaleResponse>
</Message>
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"> 
    <ds:SignedInfo>
        <ds:CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/> 
        <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/>
        <ds:Reference URI="#M1560776270228">
            <ds:DigestMethodAlgorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
            <ds:DigestValue>6nt7AHK5fyrhVW/Mdp9Slx/NBHMfekjbfThFVBRKkt8=</ds:DigestValue>
        </ds:Reference>
    </ds:SignedInfo>
    <ds:SignatureValue>Wjb1yBQzPok9VKu9U37ua3i/OsqcMZQKAvyE6iOML43rteMgorpmwlOWQSQvLHqFQt
    s4HVxvMkruDufn7wuRfqmjDWLzgUqHpFTz+heOGDXhc88ovCaE7vFeYDJg+/isHjaO29ETe6+NH8oD
    vq4/no00mA/eHWqNB+vH51+jQCZfRI+tavz1iPAFLAF9Sl5IitaiuGXkEOoOxMbZ7FAb8GT++1MuZYD
    FgWLhZ/skR57b/LobPY5n5+AkEdqc86Dyk8/zOJC6RRS9TuJWoAIgJOaVNulSB6X/lsmfu7+GDDEynqx
    obZ0djEMwXhfLSfNlNHHqkePKxEhlXMFkEL5B1jGTnHs26yymy9JYq6TtwUq9XjEn2XnYl0Oa9hwCF
    IJ8a5p8u0nPJqtWNJKqDD1YH7FSEc7cBbM8SoTjXAyLZssZmBvJ+bba+FyIl5wTeD2RKtPenptu3uoyyL
    60c+ZeGs9+N3sfWh2jpztcSAj4xLQEre59UvFE478Kw78MfF0k</ds:SignatureValue>
    <ds:KeyInfo>
    <ds:X509Data>
    <ds:X509Certificate>MIIEXjCCAsYCAQEwDQYJKoZIhvcNAQELBQAwdTElMCMGA1UEA
    xMcQ2FyZGxpbmsgVUFUIFNpZ25pbmcgYW5kIENTRTENMAsGA1UECxMERUNPTTERMA8GA1U
    EChMIQ2FyZGxpbmsxDzANBgNVBAcTBkF0aGVuczEMMAoGA1UECBMDQVRIMQswCQYDVQQ
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    wggGiMA0GCSqGSIb3DQEBAQUAA4IBjwAwggGKAoIBgQDlZIj4eMY2hU7ot4kkgB1e7xJniAe07ntR
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</VPOS>