MIME S/MIME Encryption Algorithm Properties

See more MIME Examples

Demonstrates the properties that control S/MIME encryption: Pkcs7CryptAlg (the symmetric content-encryption algorithm), Pkcs7KeyLength (the content-encryption key length in bits), OaepPadding (whether RSAES-OAEP key transport is used instead of RSAES-PKCS1-v1_5), and the OAEP hash settings OaepHash and OaepMgfHash. The properties are configured before calling Encrypt.

    success := false

    mime := chilkat.NewMime()
    success = mime.SetBodyFromPlainText("This message will be encrypted.")
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

    //  Pkcs7CryptAlg is the symmetric content-encryption algorithm.  Supported values are aes, aes-gcm,
    //  des, 3des, and rc2.  The default is aes.
    mime.SetPkcs7CryptAlg("aes")

    //  Pkcs7KeyLength is the content-encryption key length in bits.  The default is 128.
    mime.SetPkcs7KeyLength(256)

    //  OaepPadding selects the RSA key-transport padding.  The default is false (RSAES-PKCS1-v1_5).
    //  Set true to use RSAES-OAEP, in which case the OAEP hash settings apply.
    mime.SetOaepPadding(true)
    mime.SetOaepHash("sha256")
    mime.SetOaepMgfHash("sha256")

    //  Load the recipient certificate (public key is sufficient for encrypting).
    cert := chilkat.NewCert()
    success = cert.LoadFromFile("qa_data/recipient.cer")
    if success == false {
        fmt.Println(cert.LastErrorText())
        mime.DisposeMime()
        cert.DisposeCert()
        return
    }

    //  Encrypt using the algorithm settings configured above.
    success = mime.Encrypt(cert)
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        cert.DisposeCert()
        return
    }

    fmt.Println("Encrypted with ", mime.Pkcs7CryptAlg(), " ", mime.Pkcs7KeyLength(), "-bit key.")

    mime.DisposeMime()
    cert.DisposeCert()