c# - How do I sign a PDF document using a certificate from the Windows Cert Store? -



c# - How do I sign a PDF document using a certificate from the Windows Cert Store? -

i need sign pdf document using certificate exists in windows certificate store. have been digging around day trying figure out, , so close yet so far away.

all missing this: how iexternalsignature object sign pdf file with?

rahul singla has written beautiful illustration of how sign pdf document using new itext 5.3.0 api - as long as can access .pfx file sitting around on pc somewhere.

there a previous question on signing using certificate windows cert store, except using version of api setcrypto still exists, , signature apparently optional. in itext 5.3.0, api has changed, , setcrypto no longer thing.

here's have far (comments added posterity, since might finish , recent version of how on 'net):

class="lang-cs prettyprint-override">using itextsharp.text.pdf; using itextsharp.text.pdf.security; using bcx509 = org.bouncycastle.x509; using org.bouncycastle.pkcs; using org.bouncycastle.crypto; using dotnetutils = org.bouncycastle.security.dotnetutilities; ... // set pdf io pdfreader reader = new pdfreader(@"some\dir\sometemplate.pdf"); pdfstamper stamper = pdfstamper.createsignature(reader, new filestream(@"some\dir\signedpdf.pdf", filemode.create), '\0'); pdfsignatureappearance sap = stamper.signatureappearance; sap.reason = "for no apparent raisin"; sap.location = "..."; // acquire certificate chain var certstore = new x509store(storename.my, storelocation.localmachine); certstore.open(openflags.readonly); x509certificatecollection certcollection = certstore.certificates.find(x509findtype.findbysubjectname, "my.cert.subject", true); x509certificate cert = certcollection[0]; // itextsharp needs cert bouncycastle x509 object; converts it. bcx509.x509certificate bccert = dotnetutils.fromx509certificate(cert); var chain = new list<bcx509.x509certificate> { bccert }; certstore.close(); // ok, that's certificate chain done. how pks? iexternalsignature signature = null; /* ??? */ // sign pdf file , finish up. makesignature.signdetached(sap, signature, chain, // of import stuff null, null, null, 0, cryptostandard.cms); stamper.close();

as can see: i have signature, , i'm stumped how should obtain it!

x509certificate cert = certcollection[0]; // code x509certificate2 signaturecert = new x509certificate2(cert); var pk = org.bouncycastle.security.dotnetutilities.getkeypair(signaturecert.privatekey).private;

if have pk, can above, create iexternalsignature follows:

iexternalsignature es = new privatekeysignature(pk, "sha-256");

you may find next articles of use:

https://www.simple-talk.com/dotnet/.net-framework/beginning-with-digital-signatures-in-.net-framework/ http://msdn.microsoft.com/en-us/library/ms223098.aspx

c# pdf certificate itextsharp signing

Comments

Post a Comment

Popular posts from this blog

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer -

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer - when trying request rest service @ time of response getting exception.. feb 21, 2013 2:34:49 pm com.sun.jersey.spi.container.containerresponse mapmappablecontainerexception severe: exception contained within mappablecontainerexception not mapped response, re-throwing http container java.lang.noclassdeffounderror: not initialize class net.sf.cglib.proxy.enhancer @ org.hibernate.proxy.pojo.cglib.cgliblazyinitializer.getproxyfactory(cgliblazyinitializer.java:117) @ org.hibernate.proxy.pojo.cglib.cglibproxyfactory.postinstantiate(cglibproxyfactory.java:43) @ org.hibernate.tuple.entity.pojoentitytuplizer.buildproxyfactory(pojoentitytuplizer.java:162) @ org.hibernate.tuple.entity.abstractentitytuplizer.<init>(abstractentitytuplizer.java:135) @ org.hibernate.tuple.entity.pojoentitytuplizer.<init>(pojoentitytuplizer.java:55) @ org.hibernate.tuple.e...
Read more

Accessing MATLAB's unicode strings from C -

Accessing MATLAB's unicode strings from C - how can access underlying unicode info of matlab strings through matlab engine or mex c interfaces? here's example. let's set unicode characters in utf-8 encoded file test.txt, read as fid=fopen('test.txt','r','l','utf-8'); s=fscanf(fid, '%s') in matlab. now if first feature('defaultcharacterset', 'utf-8') , c engevalstring(ep, "s") , output text file utf-8. proves matlab stores unicode internally. if mxarraytostring(enggetvariable(ep, "s")) , unicode2native(s, 'latin-1') give me in matlab: non-latin-1 characters replaced character code 26. need getting access underlying unicode info c string in unicode format (utf-8, utf-16, etc.), , preserving non-latin-1 characters. is possible? my platform os x, matlab r2012b. addendum: documentation explicitly states "[mxarraytostring()] supports multibyte encoded characters...
Read more

javascript - mongodb won't find my schema method in nested container -

javascript - mongodb won't find my schema method in nested container - i trying access method of schema stored within mixed container. here situation : have cases model can many different things, have schema each of these things stored in "casecontent" mixed property. var caseschema = mongoose.schema({ casecontent : {}, object : {type:string, default : "null"}, collision : {type : boolean, default : false} }); the casecontent property filled model of 1 of schemas, 1 exemple : var treeschema = new mongoose.schema({ applecount : {type : number, default : 3} }); treeschema.methods.dostuff = function (data) { console.log('hey, listen'); homecoming true; }; then, want utilize method of schema original container : caseschema.methods.dostuff = function (data) { if (this.casecontent.dostuff !== undefined) { this.casecontent.dostuff(); console.log('it worked'); } else { ...
Read more