(Go) RSA Encrypt and Decrypt Strings

Go sample code to RSA public-key encrypt and decrypt strings using public and private keys.

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.

    rsa := chilkat.NewRsa()

    // This example also generates the public and private
    // keys to be used in the RSA encryption.
    // Normally, you would generate a key pair once,
    // and distribute the public key to your partner.
    // Anything encrypted with the public key can be
    // decrypted with the private key.  The reverse is 
    // also true: anything encrypted using the private
    // key can be decrypted using the public key.

    // Generate a 1024-bit key.  Chilkat RSA supports
    // key sizes ranging from 512 bits to 4096 bits.
    success := rsa.GenerateKey(1024)
    if success != true {
        fmt.Println(rsa.LastErrorText())
        rsa.DisposeRsa()
        return
    }

    // Keys are exported in XML format:
    publicKey := rsa.ExportPublicKey()
    privateKey := rsa.ExportPrivateKey()

    plainText := "Encrypting and decrypting should be easy!"

    // Start with a new RSA object to demonstrate that all we
    // need are the keys previously exported:
    rsaEncryptor := chilkat.NewRsa()

    // Encrypted output is always binary.  In this case, we want
    // to encode the encrypted bytes in a printable string.
    // Our choices are "hex", "base64", "url", "quoted-printable".
    rsaEncryptor.SetEncodingMode("hex")

    // We'll encrypt with the public key and decrypt with the private
    // key.  It's also possible to do the reverse.
    success = rsaEncryptor.ImportPublicKey(*publicKey)

    usePrivateKey := false
    encryptedStr := rsaEncryptor.EncryptStringENC(plainText,usePrivateKey)
    fmt.Println(*encryptedStr)

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

    rsaDecryptor.SetEncodingMode("hex")
    success = rsaDecryptor.ImportPrivateKey(*privateKey)

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

    fmt.Println(*decryptedStr)

    rsa.DisposeRsa()
    rsaEncryptor.DisposeRsa()
    rsaDecryptor.DisposeRsa()