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(Objective-C) XML Signature Multiple External ReferencesDemonstrates how to add multiple external references to an XML digital signature.
#import <CkoXmlDSigGen.h> #import <CkoXml.h> #import <CkoHttp.h> #import <CkoBinData.h> #import <NSString.h> #import <CkoCert.h> #import <CkoStringBuilder.h> #import <CkoXmlDSig.h> // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // This example creates the following signed XML with multiple external references: // <?xml version="1.0" encoding="UTF-8"?> // <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4"> // <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 Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref0" URI="https://isus.ezdrowie.gov.pl/fhir/Patient/123/_history/456"> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> // <ds:DigestValue>...</ds:DigestValue> // </ds:Reference> // <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref1" URI="https://isus.ezdrowie.gov.pl/fhir/Encounter/124/_history/22"> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> // <ds:DigestValue>...</ds:DigestValue> // </ds:Reference> // <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref2" URI="https://isus.ezdrowie.gov.pl/fhir/Condition/125/_history/1"> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> // <ds:DigestValue>...</ds:DigestValue> // </ds:Reference> // <ds:Reference Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref3" URI="https://isus.ezdrowie.gov.pl/fhir/Procedure/126/_history/1"> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> // <ds:DigestValue>...</ds:DigestValue> // </ds:Reference> // <ds:Reference Type="http://uri.etsi.org/01903#SignedProperties" URI="#xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops"> // <ds:Transforms> // <ds:Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/> // </ds:Transforms> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> // <ds:DigestValue>...</ds:DigestValue> // </ds:Reference> // </ds:SignedInfo> // <ds:SignatureValue Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-sigvalue">...</ds:SignatureValue> // <ds:KeyInfo> // <ds:X509Data> // <ds:X509Certificate>...</ds:X509Certificate> // <ds:X509SubjectName>...</ds:X509SubjectName> // <ds:X509IssuerSerial> // <ds:X509IssuerName>...</ds:X509IssuerName> // <ds:X509SerialNumber>...</ds:X509SerialNumber> // </ds:X509IssuerSerial> // </ds:X509Data> // </ds:KeyInfo> // <ds:Object> // <xades:QualifyingProperties xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" xmlns:xades141="http://uri.etsi.org/01903/v1.4.1#" Target="#xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4"> // <xades:SignedProperties Id="xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops"> // <xades:SignedSignatureProperties> // <xades:SigningTime>2021-06-02T07:10:13.306+02:00</xades:SigningTime> // <xades:SigningCertificate> // <xades:Cert> // <xades:CertDigest> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> // <ds:DigestValue>...</ds:DigestValue> // </xades:CertDigest> // <xades:IssuerSerial> // <ds:X509IssuerName>...</ds:X509IssuerName> // <ds:X509SerialNumber>...</ds:X509SerialNumber> // </xades:IssuerSerial> // </xades:Cert> // <xades:Cert> // <xades:CertDigest> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> // <ds:DigestValue>...</ds:DigestValue> // </xades:CertDigest> // <xades:IssuerSerial> // <ds:X509IssuerName>...</ds:X509IssuerName> // <ds:X509SerialNumber>...</ds:X509SerialNumber> // </xades:IssuerSerial> // </xades:Cert> // <xades:Cert> // <xades:CertDigest> // <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> // <ds:DigestValue>...</ds:DigestValue> // </xades:CertDigest> // <xades:IssuerSerial> // <ds:X509IssuerName>...</ds:X509IssuerName> // <ds:X509SerialNumber>...</ds:X509SerialNumber> // </xades:IssuerSerial> // </xades:Cert> // </xades:SigningCertificate> // </xades:SignedSignatureProperties> // </xades:SignedProperties> // </xades:QualifyingProperties> // </ds:Object> // </ds:Signature> // BOOL success = YES; CkoXmlDSigGen *gen = [[CkoXmlDSigGen alloc] init]; gen.SigLocation = @""; gen.SigLocationMod = [NSNumber numberWithInt:0]; // Note: ID's simply need to be unique values in the signed XML document. They don't necessarily need to be GUID/UUID formatted. gen.SigId = @"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4"; gen.SigNamespacePrefix = @"ds"; gen.SigNamespaceUri = @"http://www.w3.org/2000/09/xmldsig#"; gen.SigValueId = @"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-sigvalue"; gen.SignedInfoCanonAlg = @"C14N"; gen.SignedInfoDigestMethod = @"sha256"; // Create an Object to be added to the Signature. CkoXml *object1 = [[CkoXml alloc] init]; object1.Tag = @"xades:QualifyingProperties"; [object1 AddAttribute: @"xmlns:xades" value: @"http://uri.etsi.org/01903/v1.3.2#"]; [object1 AddAttribute: @"xmlns:xades141" value: @"http://uri.etsi.org/01903/v1.4.1#"]; [object1 AddAttribute: @"Target" value: @"#xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4"]; [object1 UpdateAttrAt: @"xades:SignedProperties" autoCreate: YES attrName: @"Id" attrValue: @"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime" value: @"TO BE GENERATED BY CHILKAT"]; // This assumes there are 3 certs in the certificate chain: The signing certificate, an intermediate root, and the root CA. // Remove the lines with "Cert[2]" if there is no intermediate root... [object1 UpdateAttrAt: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestMethod" autoCreate: YES attrName: @"Algorithm" attrValue: @"http://www.w3.org/2001/04/xmlenc#sha256"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestValue" value: @"TO BE GENERATED BY CHILKAT"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509IssuerName" value: @"TO BE GENERATED BY CHILKAT"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509SerialNumber" value: @"TO BE GENERATED BY CHILKAT"]; [object1 UpdateAttrAt: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[1]|xades:CertDigest|ds:DigestMethod" autoCreate: YES attrName: @"Algorithm" attrValue: @"http://www.w3.org/2001/04/xmlenc#sha256"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[1]|xades:CertDigest|ds:DigestValue" value: @"TO BE GENERATED BY CHILKAT"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[1]|xades:IssuerSerial|ds:X509IssuerName" value: @"TO BE GENERATED BY CHILKAT"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[1]|xades:IssuerSerial|ds:X509SerialNumber" value: @"TO BE GENERATED BY CHILKAT"]; [object1 UpdateAttrAt: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[2]|xades:CertDigest|ds:DigestMethod" autoCreate: YES attrName: @"Algorithm" attrValue: @"http://www.w3.org/2001/04/xmlenc#sha256"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[2]|xades:CertDigest|ds:DigestValue" value: @"TO BE GENERATED BY CHILKAT"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[2]|xades:IssuerSerial|ds:X509IssuerName" value: @"TO BE GENERATED BY CHILKAT"]; [object1 UpdateChildContent: @"xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert[2]|xades:IssuerSerial|ds:X509SerialNumber" value: @"TO BE GENERATED BY CHILKAT"]; [gen AddObject: @"" content: [object1 GetXml] mimeType: @"" encoding: @""]; CkoHttp *http = [[CkoHttp alloc] init]; CkoBinData *bd = [[CkoBinData alloc] init]; NSString *url = @"https://isus.ezdrowie.gov.pl/fhir/Patient/123/_history/456"; success = [http QuickGetBd: url binData: bd]; if (success != YES) { NSLog(@"%@",http.LastErrorText); return; } // -------- Reference 1 -------- [gen AddExternalBinaryRef: url content: bd digestMethod: @"sha256" refType: @""]; [gen SetRefIdAttr: url value: @"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref0"]; // -------- Reference 2 -------- [bd Clear]; url = @"https://isus.ezdrowie.gov.pl/fhir/Encounter/789/_history/1"; success = [http QuickGetBd: url binData: bd]; if (success != YES) { NSLog(@"%@",http.LastErrorText); return; } [gen AddExternalBinaryRef: url content: bd digestMethod: @"sha256" refType: @""]; [gen SetRefIdAttr: url value: @"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref1"]; // -------- Reference 3 -------- [bd Clear]; url = @"https://isus.ezdrowie.gov.pl/fhir/Condition/123456/_history/1"; success = [http QuickGetBd: url binData: bd]; if (success != YES) { NSLog(@"%@",http.LastErrorText); return; } [gen AddExternalBinaryRef: url content: bd digestMethod: @"sha256" refType: @""]; [gen SetRefIdAttr: url value: @"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref2"]; // -------- Reference 4 -------- [bd Clear]; url = @"https://isus.ezdrowie.gov.pl/fhir/Procedure/123456/_history/1"; success = [http QuickGetBd: url binData: bd]; if (success != YES) { NSLog(@"%@",http.LastErrorText); return; } [gen AddExternalBinaryRef: url content: bd digestMethod: @"sha256" refType: @""]; [gen SetRefIdAttr: url value: @"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-ref3"]; // -------- Reference 5 -------- [gen AddObjectRef: @"xmldsig-2dde88a8-def0-43e4-8570-b031015a46b4-signedprops" digestMethod: @"sha256" canonMethod: @"C14N" prefixList: @"" refType: @"http://uri.etsi.org/01903#SignedProperties"]; // Provide a certificate + private key. (PFX password is test123) CkoCert *cert = [[CkoCert alloc] init]; success = [cert LoadPfxFile: @"qa_data/pfx/cert_test123.pfx" password: @"test123"]; if (success != YES) { NSLog(@"%@",cert.LastErrorText); return; } [gen SetX509Cert: cert usePrivateKey: YES]; gen.KeyInfoType = @"X509Data"; gen.X509Type = @"IssuerSerial,SubjectName,Certificate"; // This will be an enveloping signature where the Signature element // is the XML document root, the signed data is contained within Object // tag(s) within the Signature. // Therefore, pass an empty sbXml to CreateXmlDsigSb. CkoStringBuilder *sbXml = [[CkoStringBuilder alloc] init]; gen.Behaviors = @"IndentedSignature"; // Sign the XML... success = [gen CreateXmlDSigSb: sbXml]; if (success != YES) { NSLog(@"%@",gen.LastErrorText); return; } // ----------------------------------------------- // Save the signed XML to a file. success = [sbXml WriteFile: @"qa_output/signedXml.xml" charset: @"utf-8" emitBom: NO]; NSLog(@"%@",[sbXml GetAsString]); // ---------------------------------------- // Verify the signature we just produced... CkoXmlDSig *verifier = [[CkoXmlDSig alloc] init]; success = [verifier LoadSignatureSb: sbXml]; if (success != YES) { NSLog(@"%@",verifier.LastErrorText); return; } BOOL verified = [verifier VerifySignature: YES]; if (verified != YES) { NSLog(@"%@",verifier.LastErrorText); return; } NSLog(@"%@",@"This signature was successfully verified."); |
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