(Swift 3,4,5...) Verify a .p7m and get Algorithm Information

Demonstrates how to verify a .p7m and then examine the algorithms used by the signature.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let crypt = CkoCrypt2()!

    var inFile: String? = "qa_data/p7m/brainpoolP256r1.p7m"
    var outFile: String? = "qa_output/something.dat"

    // Verify and extract the signed data.
    var success: Bool = crypt.verifyP7M(inFile, destPath: outFile)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Examine details about the signature(s)
    var json: CkoJsonObject? = crypt.lastJsonData()
    json.emitCompact = false
    print("\(json!.emit()!)")

    // Sample output

    // {
    //   "pkcs7": {
    //     "verify": {
    //       "digestAlgorithms": [
    //         "sha256"
    //       ],
    //       "signerInfo": [
    //         {
    //           "cert": {
    //             "serialNumber": "FFFFE552B302FFFFFF1E34C3ACEB2FFFF",
    //             "issuerCN": "The common name of the cert...",
    //             "issuerDN": "",
    //             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
    //             "digestAlgName": "SHA256"
    //           },
    //           "contentType": "1.2.840.113549.1.7.1",
    //           "signingTime": "190409140500Z",
    //           "messageDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=",
    //           "signingAlgOid": "1.2.840.10045.4.3.2",
    //           "signerDigest": "lQe9If7vZKFf/NlSYu5Esmlw3phVK/RFsbbb1uH73t8=",
    //           "authAttr": [
    //             {
    //               "oid": "1.2.840.113549.1.9.3",
    //               "oidName": "contentType"
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.5",
    //               "oidName": "signingTime"
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.52",
    //               "oidName": "1.2.840.113549.1.9.52",
    //               "der": "MBs ... AwI="
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.4",
    //               "oidName": "messageDigest"
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.16.2.47",
    //               "oidName": "signingCertificateV2",
    //               "der": "MCYw .. 7PlQ=="
    //             },
    //             {
    //               "oid": "1.2.840.113549.1.9.20",
    //               "oidName": "1.2.840.113549.1.9.20"
    //             }
    //           ]
    //         }
    //       ]
    //     }
    //   }
    // }

    // Code for parsing the above JSON...
    var i: Int
    var count_i: Int
    var strVal: String?
    var certSerialNumber: String?
    var certIssuerCN: String?
    var certIssuerDN: String?
    var certDigestAlgOid: String?
    var certDigestAlgName: String?
    var contentType: String?
    var signingTime: String?
    var messageDigest: String?
    var signingAlgOid: String?
    var signerDigest: String?
    var j: Int
    var count_j: Int
    var oid: String?
    var oidName: String?
    var der: String?

    i = 0
    count_i = json!.size(ofArray: "pkcs7.verify.digestAlgorithms").intValue
    while i < count_i {
        json.i = i
        strVal = json!.string(of: "pkcs7.verify.digestAlgorithms[i]")
        i = i + 1
    }

    i = 0
    count_i = json!.size(ofArray: "pkcs7.verify.signerInfo").intValue
    while i < count_i {
        json.i = i
        certSerialNumber = json!.string(of: "pkcs7.verify.signerInfo[i].cert.serialNumber")
        certIssuerCN = json!.string(of: "pkcs7.verify.signerInfo[i].cert.issuerCN")
        certIssuerDN = json!.string(of: "pkcs7.verify.signerInfo[i].cert.issuerDN")
        certDigestAlgOid = json!.string(of: "pkcs7.verify.signerInfo[i].cert.digestAlgOid")
        certDigestAlgName = json!.string(of: "pkcs7.verify.signerInfo[i].cert.digestAlgName")
        contentType = json!.string(of: "pkcs7.verify.signerInfo[i].contentType")
        signingTime = json!.string(of: "pkcs7.verify.signerInfo[i].signingTime")
        messageDigest = json!.string(of: "pkcs7.verify.signerInfo[i].messageDigest")
        signingAlgOid = json!.string(of: "pkcs7.verify.signerInfo[i].signingAlgOid")
        signerDigest = json!.string(of: "pkcs7.verify.signerInfo[i].signerDigest")
        j = 0
        count_j = json!.size(ofArray: "pkcs7.verify.signerInfo[i].authAttr").intValue
        while j < count_j {
            json.j = j
            oid = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr[j].oid")
            oidName = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr[j].oidName")
            der = json!.string(of: "pkcs7.verify.signerInfo[i].authAttr[j].der")
            j = j + 1
        }

        i = i + 1
    }

    json = nil

    print("Success!")

}