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(Go) RSA Signature/Verify with .key and .cer

Demonstrates how to use a .key file (private key) and digital certificate (.cer, public key) to create and verify an RSA signature.

Chilkat Go Downloads

Go Package for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

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

    privKey := chilkat.NewPrivateKey()

    // Load the private key from an RSA .key file:
    success := privKey.LoadPemFile("privateKey.key")
    if success != true {
        fmt.Println(privKey.LastErrorText())
        privKey.DisposePrivateKey()
        return
    }

    var privKeyXml *string = new(string)
    // Get the private key in XML format:
    privKeyXml = privKey.GetXml()

    rsa := chilkat.NewRsa()

    // Import the private key into the RSA component:
    success = rsa.ImportPrivateKey(*privKeyXml)
    if success != true {
        fmt.Println(rsa.LastErrorText())
        privKey.DisposePrivateKey()
        rsa.DisposeRsa()
        return
    }

    // Create the signature as a hex string:
    rsa.SetEncodingMode("hex")

    // If some other non-Chilkat application or web service is going to be verifying
    // the signature, it is important to match the byte-ordering.
    // The LittleEndian property may be set to true
    // for little-endian byte ordering, 
    // or false  for big-endian byte ordering.
    // Microsoft apps typically use little-endian, while
    // OpenSSL and other services (such as Amazon CloudFront)
    // use big-endian.
    rsa.SetLittleEndian(false)

    strData := "This is the string to be signed."

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "md2", "sha256", "sha384",
    // "sha512", and "md5".
    hexSig := rsa.SignStringENC(strData,"sha-1")

    fmt.Println(*hexSig)

    // Load a digital certificate from a .cer file:
    cert := chilkat.NewCert()

    success = cert.LoadFromFile("myCert.cer")
    if success != true {
        fmt.Println(cert.LastErrorText())
        privKey.DisposePrivateKey()
        rsa.DisposeRsa()
        cert.DisposeCert()
        return
    }

    var pubKey  PublicKey

    pubKey = cert.ExportPublicKey()

    // Now verify using a separate instance of the RSA object:
    rsa2 := chilkat.NewRsa()

    // Import the public key into the RSA object:
    success = rsa2.ImportPublicKey(*pubKey.GetXml())
    if success != true {
        fmt.Println(rsa2.LastErrorText())
        privKey.DisposePrivateKey()
        rsa.DisposeRsa()
        cert.DisposeCert()
        rsa2.DisposeRsa()
        return
    }

    pubKey.DisposePublicKey()

    // The signature is a hex string, so make sure the EncodingMode is correct:
    rsa2.SetEncodingMode("hex")

    // Verify the signature:
    success = rsa2.VerifyStringENC(strData,"sha-1",*hexSig)
    if success != true {
        fmt.Println(rsa2.LastErrorText())
        privKey.DisposePrivateKey()
        rsa.DisposeRsa()
        cert.DisposeCert()
        rsa2.DisposeRsa()
        return
    }

    fmt.Println("Success.")

    privKey.DisposePrivateKey()
    rsa.DisposeRsa()
    cert.DisposeCert()
    rsa2.DisposeRsa()

 

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