Xbase++ Requires Chilkat v11.0.0+

P7S - Access Signature Information (date/time, certificate used, etc.)

See more Digital Signatures Examples

Examine a PKCS7 signature (.p7s) and get information about it. Xbase++

LOCAL nSuccess
LOCAL oBd
LOCAL oCrypt
LOCAL oJson
LOCAL i
LOCAL nCount_i
LOCAL cStrVal
LOCAL cCertSerialNumber
LOCAL cCertIssuerCN
LOCAL cCertIssuerDN
LOCAL cCertDigestAlgOid
LOCAL cCertDigestAlgName
LOCAL cContentType
LOCAL cSigningTime
LOCAL cMessageDigest
LOCAL cSigningAlgOid
LOCAL cSignerDigest
LOCAL oDt

nSuccess := 0

//  This requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  First load the .p7s file into a BinData object..
oBd := CreateObject("Chilkat.BinData")
nSuccess := oBd:LoadFile("qa_data/p7s/sample.p7s")
IF (nSuccess != 1)
    ? "Failed to load .p7s file."
    oBd:destroy()
    RETURN
ENDIF

oCrypt := CreateObject("Chilkat.Crypt2")

//  Assuming this is a signature that contains the original data that was signed..
nSuccess := oCrypt:OpaqueVerifyBd(oBd)
IF (nSuccess == 0)
    ? oCrypt:LastErrorText
    oBd:destroy()
    oCrypt:destroy()
    RETURN
ENDIF

//  Examine the last JSON data after signature verification..
oJson := CreateObject("Chilkat.JsonObject")
oCrypt:GetLastJsonData(oJson)

oJson:EmitCompact := 0
? oJson:Emit()

//  Sample output...
//  Go to http://tools.chilkat.io/jsonParse.cshtml
//  and paste the JSON into the online form to generate JSON parsing code.

//  {
//    "pkcs7": {
//      "verify": {
//        "digestAlgorithms": [
//          "sha256"
//        ],
//        "signerInfo": [
//          {
//            "cert": {
//              "serialNumber": "AAC5FC48C0FD8FBB",
//              "issuerCN": "AC ABCDEF RFB v5",
//              "issuerDN": "",
//              "digestAlgOid": "2.16.840.1.101.3.4.2.1",
//              "digestAlgName": "SHA-256"
//            },
//            "contentType": "1.2.840.113549.1.7.1",
//            "signingTime": "180607195054Z",
//            "messageDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8=",
//            "signingAlgOid": "1.2.840.113549.1.1.11",
//            "signerDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8="
//          },
//          {
//            "cert": {
//              "serialNumber": "324FB38ABD59723F",
//              "issuerCN": "AC ABCDEF RFB v5",
//              "issuerDN": "",
//              "digestAlgOid": "2.16.840.1.101.3.4.2.1",
//              "digestAlgName": "SHA-256"
//            },
//            "contentType": "1.2.840.113549.1.7.1",
//            "signingTime": "180608182517Z",
//            "messageDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8=",
//            "signingAlgOid": "1.2.840.113549.1.1.11",
//            "signerDigest": "trzyxXbZ96z2M4mncyZ7BNMV4yIT92+5sS27Fu64iG8="
//          }
//        ]
//      }
//    }
//  }
//  

oDt := CreateObject("Chilkat.CkDateTime")

i := 0
nCount_i := oJson:SizeOfArray("pkcs7.verify.digestAlgorithms")
DO WHILE i < nCount_i
    oJson:I := i
    cStrVal := oJson:StringOf("pkcs7.verify.digestAlgorithms[i]")
    i := i + 1
ENDDO
i := 0
nCount_i := oJson:SizeOfArray("pkcs7.verify.signerInfo")
DO WHILE i < nCount_i
    oJson:I := i
    cCertSerialNumber := oJson:StringOf("pkcs7.verify.signerInfo[i].cert.serialNumber")
    cCertIssuerCN := oJson:StringOf("pkcs7.verify.signerInfo[i].cert.issuerCN")
    cCertIssuerDN := oJson:StringOf("pkcs7.verify.signerInfo[i].cert.issuerDN")
    cCertDigestAlgOid := oJson:StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid")
    cCertDigestAlgName := oJson:StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName")
    cContentType := oJson:StringOf("pkcs7.verify.signerInfo[i].contentType")
    cSigningTime := oJson:StringOf("pkcs7.verify.signerInfo[i].signingTime")

    //  The signingTime isin UTCTime format.
    //  UTCTime values take the form of either "YYMMDDhhmm[ss]Z" or "YYMMDDhhmm[ss](+|-)hhmm"
    //  Starting in Chilkat v9.5.0.77, the SetFromTimestamp method auto-recognizes the UTCTime format and parses it correctly.
    nSuccess := oDt:SetFromTimestamp(cSigningTime)
    //  To get the signingTime in other date/time formats, look at the online reference documentation for CkDateTime.
    //  There are numerous methods such as GetAsDateTime, GetAsIso8601, GetAsUnixTime, GetAsRfc822, etc.

    cMessageDigest := oJson:StringOf("pkcs7.verify.signerInfo[i].messageDigest")
    cSigningAlgOid := oJson:StringOf("pkcs7.verify.signerInfo[i].signingAlgOid")
    cSignerDigest := oJson:StringOf("pkcs7.verify.signerInfo[i].signerDigest")
    i := i + 1
ENDDO

//  println crypt.LastErrorText;
? "Success."

oBd:destroy()
oCrypt:destroy()
oJson:destroy()
oDt:destroy()