(Go) 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 Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

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

    mime := chilkat.NewMime()

    success := mime.LoadMimeFile("c:/aaworkarea/EmailInBytes.txt")
    if success != true {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

    success = mime.SaveBody("c:/aaworkarea/smime.p7m")
    if success != true {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

    crypt := chilkat.NewCrypt2()

    success = crypt.AddPfxSourceFile("c:/aaworkarea/my.pfx","pfxPassword")
    if success == false {
        fmt.Println(crypt.LastErrorText())
        mime.DisposeMime()
        crypt.DisposeCrypt2()
        return
    }

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

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

    success = crypt.CkDecryptFile(inPath,outPath)
    if success == false {
        fmt.Println(crypt.LastErrorText())
        mime.DisposeMime()
        crypt.DisposeCrypt2()
        return
    }

    fmt.Println("Success.")

    mime.DisposeMime()
    crypt.DisposeCrypt2()