(Swift 3,4,5...) Extract PKCS7 from MIME and Decrypt

Extracts the base64-encoded PKCS7 body of a MIME message to a file, and then decrypts using Chilkat Crypt2.

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

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

    let mime = CkoMime()!

    var success: Bool = mime.loadFile("c:/aaworkarea/EmailInBytes.txt")
    if success != true {
        print("\(mime.lastErrorText!)")
        return
    }

    success = mime.saveBody("c:/aaworkarea/smime.p7m")
    if success != true {
        print("\(mime.lastErrorText!)")
        return
    }

    let crypt = CkoCrypt2()!

    success = crypt.addPfxSourceFile("c:/aaworkarea/my.pfx", password: "pfxPassword")
    if success == false {
        print("\(crypt.lastErrorText!)")
        return
    }

    // Indicate the public-key (PKCS7) encryption/decryption should be used:
    crypt.cryptAlgorithm = "pki"

    var inPath: String? = "c:/aaworkarea/smime.p7m"
    var outPath: String? = "c:/aaworkarea/decrypted.dat"

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

    print("Success.")

}