Go

RSA Encrypt and Decrypt Credit Card Numbers

See more RSA Examples

_LANGUAGE_ sample code to RSA public-key encrypt and decrypt credit card numbers. The RSA key is loaded from an unencrypted PKCS8 file. Chilkat provides many ways of setting the key -- loading from both encrypted and unencrypted PEM, PKCS8, DER, PVK, etc. Keys may be loaded from files or in-memory representations. (The RSA component also provides the ability to generate RSA keys.) Go

    success := false

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

    rsa := chilkat.NewRsa()

    privKey := chilkat.NewPrivateKey()

    // Load an RSA private key from a file:
    success = privKey.LoadAnyFormatFile("rsaPrivateKey.key","")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        rsa.DisposeRsa()
        privKey.DisposePrivateKey()
        return
    }

    // Get the public part of the private key.
    pubKey := chilkat.NewPublicKey()
    privKey.ToPublicKey(pubKey)

    success = rsa.UsePublicKey(pubKey)
    if success == false {
        fmt.Println(rsa.LastErrorText())
        rsa.DisposeRsa()
        privKey.DisposePrivateKey()
        pubKey.DisposePublicKey()
        return
    }

    // Encrypt a VISA credit card number:
    // 1234-5678-0000-9999
    ccNumber := "1234567800009999"

    usePrivateKey := false
    rsa.SetEncodingMode("base64")
    encryptedStr := rsa.EncryptStringENC(ccNumber,usePrivateKey)
    fmt.Println("Encrypted:")
    fmt.Println(*encryptedStr)

    // Now decrypt:
    rsaDecryptor := chilkat.NewRsa()

    rsaDecryptor.SetEncodingMode("base64")
    rsaDecryptor.UsePrivateKey(privKey)

    usePrivateKey = true
    decryptedStr := rsaDecryptor.DecryptStringENC(*encryptedStr,usePrivateKey)

    fmt.Println("Decrypted:")
    fmt.Println(*decryptedStr)

    // Important: RSA encryption should only be used to encrypt small amounts of data.
    // It is typically used for encrypting symmetric encryption
    // keys such that a symmetric encryption algorithm, such as 
    // AES is then used to encrypt/decrypt bulk data

    rsa.DisposeRsa()
    privKey.DisposePrivateKey()
    pubKey.DisposePublicKey()
    rsaDecryptor.DisposeRsa()