69 lines
2.2 KiB
VB.net
69 lines
2.2 KiB
VB.net
Public Class SecurityUtils
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#Region " Declarations "
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Private Const ENCRYPTION_KEY_SUFFIX As String = "SDT"
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Private Const KEY_SIZE_BYTES As Integer = 32 ' 256 bits for AES-256
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#End Region
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#Region " Methods "
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Private Shared Function PadKey(key As String) As String
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If key Is Nothing Then
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Throw New ArgumentNullException(NameOf(key))
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End If
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Dim paddedKey As String = key & ENCRYPTION_KEY_SUFFIX
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If paddedKey.Length < KEY_SIZE_BYTES Then
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paddedKey = paddedKey.PadRight(KEY_SIZE_BYTES, "X"c)
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ElseIf paddedKey.Length > KEY_SIZE_BYTES Then
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paddedKey = paddedKey.Substring(0, KEY_SIZE_BYTES)
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End If
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Return paddedKey
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End Function
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Public Shared Function EncryptValue(value As String, key As String) As String
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If value Is Nothing Then
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Return Nothing
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End If
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If String.IsNullOrEmpty(value) Then
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Return String.Empty
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End If
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If key Is Nothing Then
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Throw New ArgumentNullException(NameOf(key))
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End If
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' Create encryptor with default IV
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Dim encryption As New EncryptionUtils.SymmetricEncryptor(EncryptionUtils.SymmetricEncryptor.Provider.AES)
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Dim result = encryption.Encrypt(New EncryptionUtils.Data(value), New EncryptionUtils.Data(PadKey(key)))
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Return result.Base64
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End Function
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Public Shared Function DecryptValue(encryptedValue As String, key As String) As String
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If encryptedValue Is Nothing Then
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Return Nothing
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End If
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If String.IsNullOrEmpty(encryptedValue) Then
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Return String.Empty
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End If
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If key Is Nothing Then
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Throw New ArgumentNullException(NameOf(key))
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End If
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Dim encryption As New EncryptionUtils.SymmetricEncryptor(EncryptionUtils.SymmetricEncryptor.Provider.AES)
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' note EncryptValue returns Base64 string so we need to initialized encryptedData as Base64
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Dim encryptedData As EncryptionUtils.Data = New EncryptionUtils.Data()
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encryptedData.Base64 = encryptedValue
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Return encryption.Decrypt(encryptedData, New EncryptionUtils.Data(PadKey(key))).Text
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End Function
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#End Region
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End Class
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