(Swift 3,4,5...) Decrypt a .p7m File (using a PFX)

Swift 3,4,5... sample code showing how to decrypt a .p7m using a .p12 / .pfx certificate w/ private key.

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()!

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    var pfxPath: String? = "myCertAndKey.pfx"
    var pfxPassword: String? = "test123"

    var success: Bool = crypt.addPfxSourceFile(pfxPath, password: pfxPassword)
    if success != true {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Set the  outPath to whatever is appropriate.
    // If you are decrypting a PDF, your output might be "out.pdf"...
    var inPath: String? = "smime.p7m"
    var outPath: String? = "original.txt"

    // Indicate that we're doing public key decryption (i.e. PKCS7)
    crypt.cryptAlgorithm = "pki"

    success = crypt.ckDecryptFile(inPath, destFile: outPath)
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    print("Success.")

}