Go

RSA Encrypt Bytes to Base64 and Reverse

See more RSA Examples

Demonstrates how to RSA encrypt bytes to base64 and the reverse. Go

    success := false

    // The RSA public key is used for encryption, and the private key for decryption.

    // The public key's role is to make encryption accessible to anyone while ensuring that
    // only the private key holder can decrypt the messages.
    // The public key is designed to be widely distributed so anyone can use it to encrypt messages
    // intended for the owner of the private key.

    // Load our 2048-bit RSA public key.
    pubKey := chilkat.NewPublicKey()
    // In all Chilkat methods expecting a path, you pass either absolute or relative paths.
    success = pubKey.LoadFromFile("qa_data/rsaKeys/myTestRsaPublic.pem")
    if success == false {
        fmt.Println(pubKey.LastErrorText())
        pubKey.DisposePublicKey()
        return
    }

    rsa := chilkat.NewRsa()

    // Tell RSA to use the public key.
    rsa.UsePublicKey(pubKey)

    // RSA encryption is for small amounts of data, on the order of 200 bytes or less.
    // The maximum number of bytes that can be RSA encrypted depends
    // on the RSA key size and padding scheme (OAEP padding vs PKCS#1 v1.5 padding).
    // For specific limits, see: RSA Encryption Maximum Number of Bytes

    // A typical use for RSA is to encrypt symmetric encryption keys, such as an AES key.
    prng := chilkat.NewPrng()
    var keyBytes []byte
    keyBytes = prng.GenRandomBytes(32)

    rsa.SetEncodingMode("base64")
    encryptedB64 := rsa.EncryptBytesENC(keyBytes,false)

    fmt.Println("Result:")
    fmt.Println(*encryptedB64)

    // Sample output:
    // hTTV4Lbmm2V7NCw/HaoJL8Aq/MM/HXblQnjitrF9HY1zBlISwui2jGVVZDtZcZ/rICOpPw44w8Qb8AswFVE1sryydmNEvcIfYAp/xgdBPXBERAS0y4AoEzUfuC5TJmJFvnFkl2lX8GAclANfcTik38V+k3EXu5wPzHKNFb07c6jnwh3Jm4f3PRUhmmB2NO5kSWqHsx0dNglOTq5BUZx34nxlXL5G8d7mXqITsUtrOHXAO/Gb7IrvB81Xk2vc5p4yHhiY/rFTHTTmZyzte2qHGm7V6xPRNURjiivnMY2jQU0Um1JKQcAiSe8Suwvd2LXP5PIhl71VLgO+fokjnynfRg==

    // ------------------------------------------------------------------------------------------------------------------------
    // Let's decrypt, which requires the matching private key...

    // Load the matching 2048-bit RSA private key.
    privKey := chilkat.NewPrivateKey()
    password := "secret"
    success = privKey.LoadAnyFormatFile("qa_data/rsaKeys/myTestRsaPrivate.pem",password)
    if success == false {
        fmt.Println(privKey.LastErrorText())
        pubKey.DisposePublicKey()
        rsa.DisposeRsa()
        prng.DisposePrng()
        privKey.DisposePrivateKey()
        return
    }

    // Tell the RSA object to use the private key.
    rsa.UsePrivateKey(privKey)

    var decBytes []byte
    decBytes = rsa.DecryptBytesENC(*encryptedB64,true)
    if success == false {
        fmt.Println(rsa.LastErrorText())
        pubKey.DisposePublicKey()
        rsa.DisposeRsa()
        prng.DisposePrng()
        privKey.DisposePrivateKey()
        return
    }

    fmt.Println("Success.")

    pubKey.DisposePublicKey()
    rsa.DisposeRsa()
    prng.DisposePrng()
    privKey.DisposePrivateKey()