Go

Verify an RSA Signature Against the Signed Hash

See more Apple Keychain Examples

Demonstrates how to validate an RSA Signature against the hash that was signed. Go

    success := false

    bd := chilkat.NewBinData()
    var i int
    for i = 0; i <= 100; i++ {
        bd.AppendEncoded("000102030405060708090A0B0C0D0E0F","hex")
    }

    sha256_base64 := bd.GetHash("sha256","base64")
    fmt.Println("sha256 hash in base64 format: ", *sha256_base64)

    base64_rsa_sig := "AwF2BbOvL6jA5DwmMAc9n6J2Cc8PI6Rj5W079+aKJcIEtPWRzHor0Bvc3aftGM3Jbgj6SXlIC3M3RYS7UZOnfiHKFNZgbxaNT5WwsWooK42ZkC8DBZl0p7OunBUKd5SciUo+TKilioeUkriN3L1Zl9hwi3HVDVqgVo3XXskwIftSqLSFlepTLTmOWj9Y93dp8J4D9RyLtNgFQBc0WB22tyJTsuY56mLcWe1AMF3LizB9OrbwjynF2u16xWlrJdugccz795fJBUV9aQSD+8S3KeqwQhoi8RK1uhD68aGCyaSpBq0NZ8COAkn7MXaF4POxrAAt8udfHM+PRfSOptcH/w=="

    // Get the public key to be used for signature verification.
    pubKey := chilkat.NewPublicKey()
    success = pubKey.LoadFromFile("rsaKeys/chilkat-rsa-2048.pem")
    if success == false {
        fmt.Println(pubKey.LastErrorText())
        bd.DisposeBinData()
        pubKey.DisposePublicKey()
        return
    }

    rsa := chilkat.NewRsa()
    success = rsa.UsePublicKey(pubKey)
    if success == false {
        fmt.Println(rsa.LastErrorText())
        bd.DisposeBinData()
        pubKey.DisposePublicKey()
        rsa.DisposeRsa()
        return
    }

    // Verify the hash against the signature.
    rsa.SetEncodingMode("base64")
    success = rsa.VerifyHashENC(*sha256_base64,"sha256",base64_rsa_sig)

    if success == false {
        fmt.Println(rsa.LastErrorText())
        fmt.Println("Signature invalid.")
    } else {
        fmt.Println("Signature valid.")
    }


    bd.DisposeBinData()
    pubKey.DisposePublicKey()
    rsa.DisposeRsa()