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(Android™) Create XML Signature with Certificate's Private KeyDemonstrates how to create an XML digital signature using a certificate's RSA private key. This example loads the certificate from a PFX, and uses the cert's associated private key to sign. The public key is embedded in the XML signature as a ds:KeyInfo / ds:KeyValue / dsRSAKeyValue element. This example requires Chilkat v9.5.0.71 or greater.
// Important: Don't forget to include the call to System.loadLibrary // as shown at the bottom of this code sample. package com.test; import android.app.Activity; import com.chilkatsoft.*; import android.widget.TextView; import android.os.Bundle; public class SimpleActivity extends Activity { private static final String TAG = "Chilkat"; // Called when the activity is first created. @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The SOAP XML to be signed in this example contains the following: // <?xml version="1.0" encoding="UTF-8" standalone="no" ?> // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> // <SOAP-ENV:Header> // <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"></wsse:Security> // </SOAP-ENV:Header> // <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body"> // <z:FooBar xmlns:z="http://example.com" /> // </SOAP-ENV:Body> // </SOAP-ENV:Envelope> // // The above XML is available at https://www.chilkatsoft.com/exampleData/soapToSign.xml // Fetch the XML and then sign it.. String url = "https://www.chilkatsoft.com/exampleData/soapToSign.xml"; CkHttp http = new CkHttp(); CkStringBuilder sbSoapXml = new CkStringBuilder(); boolean success = http.QuickGetSb(url,sbSoapXml); if (success != true) { Log.i(TAG, http.lastErrorText()); return; } // Load a PFX file containing the certificate + private key. CkCert cert = new CkCert(); success = cert.LoadPfxFile("/somedir/myPfx.pfx","pfx_password"); if (success != true) { Log.i(TAG, cert.lastErrorText()); return; } // Get the RSA private key for signing... CkPrivateKey rsaKey = cert.ExportPrivateKey(); if (cert.get_LastMethodSuccess() != true) { Log.i(TAG, cert.lastErrorText()); return; } // To create the XML digital signature (i.e. embed the signature within // the SOAP XML), we specify what is desired, and then call the method to // create the XML signature. // // For example, the application must provide the following: // - Where to put the signature. // - What to sign. // - The algorithms to be used. // - The key to be used for signing. // CkXmlDSigGen xmlSigGen = new CkXmlDSigGen(); // In this example, we're going to put the signature within the wsse:Security element. // To specify the location, set the SigLocation property to the XML path to this element, // using vertical bar characters to separate tags. xmlSigGen.put_SigLocation("SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security"); // An XML digital signature contains one or more references. These are references to the parts // of the XML document to be signed (a same document reference), or can be external references. // This example will add a single same-document reference. We'll add a reference to the XML fragment // at SOAP-ENV:Body, which is indicated by providing the value of the "ID" attribute (where "ID" is case // insensitive). For each same-document reference, we must also indicate the hash algorithm and XML canonicalization // algorithm to be used. For this example we'll choose SHA-256 and Exclusive XML Canonicalization. xmlSigGen.AddSameDocRef("Body","sha256","EXCL_C14N","",""); // Let's provide the RSA key to be used for signing: xmlSigGen.SetPrivateKey(rsaKey); // We're leaving the following properties at their default values: // // - SigNamespacePrefix (default is "ds") // - SigningAlg (for RSA keys. The default is PKCS1-v1_5, can be changed to RSASSA-PSS.) // - SignedInfoCanonAlg (default is EXCL_C14N) // - SignedInfoDigestMethod (default is sha256) // - KeyInfoType (default is "KeyValue", where the RSA public key is included in the Signature) // Note: Each Reference has it's own specified algorithms for XML canonicalization and hashing, // and the actual signature part (the SignedInfo) has it's own algorithms for the same. // They may or may not be the same. In this example, we use Exclusive XML Canonicalization and SHA-256 throughout. // Finally, we're going to set one property that's optional, but commonly used. // It's the SignedInfoPrefixList. In this case, we're using Exclusive Canonicalization, and the signature // will be placed in a location within the XML document where namespace prefixes are used in the ancestors. // Specifically, the "wsse" and "SOAP-ENV" namespace prefixes are used. xmlSigGen.put_SignedInfoPrefixList("wsse SOAP-ENV"); // OK, everything's specified, so let's create the XML digital signature: // This in-place signs the XML. If successful, sbSoapXml will contain the // XML with the digital signature at the specified location. success = xmlSigGen.CreateXmlDSigSb(sbSoapXml); if (success != true) { Log.i(TAG, xmlSigGen.lastErrorText()); return; } // Examine the signed SOAP XML: Log.i(TAG, sbSoapXml.getAsString()); // This is the signed SOAP XML. // Chilkat emits the Signature in compact form on a single line. Whitespace in XML signatures // matters. Chilkat's opinion is that writing the Signature without whitespace minimizes the chance // for problems with whatever software might be verifying the signature. // <?xml version="1.0" encoding="UTF-8" standalone="no" ?> // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> // <SOAP-ENV:Header> // <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"><ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"><InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="wsse SOAP-ENV"/></ds:CanonicalizationMethod><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#Body"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>OwgHPZNfDkXnZsjpfzXqAcT3RV3HzmTsEy2bP44FJ0M=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>C+7FWngUpJ33Q1yq8uuscjCyPN2IO4cJhpMv03Jrrht1V+4gvJQLIBk6HHjo1uPQyfYj6zji3pg+fOyGUptp17CsRvjCzSpP35vB2lEzHeS8dcY8XfrEtTP/0FNn75LmhhkOPy0wjWkgDVbgzhXpEk9az8r8fQVTM3vrcmXT+WdMWJXKBRFt6PLAhsFt0scOFTWAkLGyCwygzimDKX2nT63TOit9BigtIx7fPRuMkbybMKCGGABq2DiEbvrPOiN3SUYpyMNR9KehRAGN+OWnESaDC6DhOvbKR88XHkM+GeaRe9PWdrRHrwGfp3qgolKjR/wFRSa1YGSBKAhDJFBcdg==</ds:SignatureValue><ds:KeyInfo><ds:KeyValue><ds:RSAKeyValue><ds:Modulus>sXeRhM55P13FbpNcXAMR3olbw2Wa6keZIHu5YTZYUBTlYWId+pNiwUz3zFIEo+0IfYR0H27ybIycQO+1IIzJofUFNMAL3tZps2OKPlsjuCPls6kXpXhv/gvhux8LrCtp4PcKWqJ6QVOZKChc7WAx40qFWzHi57ueqRTv3x0kESqGg/VjsqyTEvb55psJO2RsfhLT7+YVh3hImRM3RDaJdkTkPuOxeFyT6N7VXD09329sLuS3QkUbE9zEKDnz9X3d8dEQdJhSI9ba5fxl8R7fu8pB67ElfzFml96X1jLFtzy1pzOT5Fc4ROcaqlYckVzdBq9sxezm6MYmDBjNAcibRw==</ds:Modulus><ds:Exponent>AQAB</ds:Exponent></ds:RSAKeyValue></ds:KeyValue></ds:KeyInfo></ds:Signature></wsse:Security> // </SOAP-ENV:Header> // <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body"> // <z:FooBar xmlns:z="http://example.com" /> // </SOAP-ENV:Body> // </SOAP-ENV:Envelope> // Here's the signature part formatted for easier reading. // (Adding whitespace to the SignedInfo breaks the signature, so you wouldn't want to do this..) // <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"> // <ds:SignedInfo> // <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"> // <InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="wsse SOAP-ENV" /> // </ds:CanonicalizationMethod> // <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256" /> // <ds:Reference URI="#Body"> // <ds:Transforms> // <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" /> // </ds:Transforms> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" /> // <ds:DigestValue>OwgHPZNfDkXnZsjpfzXqAcT3RV3HzmTsEy2bP44FJ0M=</ds:DigestValue> // </ds:Reference> // </ds:SignedInfo> // <ds:SignatureValue>C+7FWngUp....BKAhDJFBcdg==</ds:SignatureValue> // <ds:KeyInfo> // <ds:KeyValue> // <ds:RSAKeyValue> // <ds:Modulus>sXeRhM55P13FbpNcXAMR....MYmDBjNAcibRw==</ds:Modulus> // <ds:Exponent>AQAB</ds:Exponent> // </ds:RSAKeyValue> // </ds:KeyValue> // </ds:KeyInfo> // </ds:Signature> } static { System.loadLibrary("chilkat"); // Note: If the incorrect library name is passed to System.loadLibrary, // then you will see the following error message at application startup: //"The application <your-application-name> has stopped unexpectedly. Please try again." } } |
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