[英]Using If-Statement as test condition for For-Loop in Vb.net
[英]Using AesCryptoServiceProvider in VB.NET
我的問題實際上比在VB.NET中如何使用AES要復雜得多,因為我真正想要做的是在JACOB中的Java應用程序中使用VB.NET中的AES。 但就目前而言,我需要關注的是AES實現本身。
這是我的加密代碼
Public Function EncryptAES(ByVal toEncrypt As String, ByVal key As String) As Byte()
Dim keyArray = Convert.FromBase64String(key)
Dim toEncryptArray = Encoding.Unicode.GetBytes(toEncrypt)
Dim aes = New AesCryptoServiceProvider
aes.Key = keyArray
aes.Mode = CipherMode.ECB
aes.Padding = PaddingMode.ISO10126
Dim encryptor = aes.CreateEncryptor()
Dim encrypted = encryptor.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length)
aes.Clear()
Return encrypted
End Function
回到Java代碼后,我將字節數組轉換為十六進制字符串。
現在,為了扭轉這個過程,這是我的解密代碼
Public Function DecryptAES(ByVal toDecrypt As String, ByVal key As String) As Byte()
Dim keyArray = Convert.FromBase64String(key)
Dim toDecryptArray = Convert.FromBase64String(toDecrypt)
Dim aes = New AesCryptoServiceProvider
aes.Key = keyArray
aes.Mode = CipherMode.ECB
aes.Padding = PaddingMode.ISO10126
Dim decryptor = aes.CreateDecryptor()
Dim decrypted = decryptor.TransformFinalBlock(toDecryptArray, 0, toDecryptArray.Length)
aes.Clear()
Return decrypted
End Function
當我運行解密代碼時,我收到以下錯誤消息
填充無效,無法刪除。
好的,所以原始代碼有一些問題。
一個,沒有調試。 我必須添加一個內部測試來驗證我的代碼在用Java包裝之前可以加密和解密。 這對我來說很愚蠢。
二:加密器和解密器對象的TransformFinalBlock方法似乎沒有像宣傳的那樣執行。
足夠的談話。 這是代碼
Public Function EncryptAES(ByVal clearText As String, ByVal key As String) As String
' prepare input
Dim keyBytes = Convert.FromBase64String(key)
Dim sourceBytes = Encoding.Unicode.GetBytes(clearText)
' prepare encryption provider
Dim aes = New AesCryptoServiceProvider
aes.Key = keyBytes
aes.Mode = CipherMode.ECB
aes.Padding = PaddingMode.ISO10126
Dim encryptor = aes.CreateEncryptor()
Dim ms = New MemoryStream
Dim cs = New CryptoStream(ms, encryptor, CryptoStreamMode.Write)
cs.Write(sourceBytes, 0, sourceBytes.Length)
cs.FlushFinalBlock()
Dim encrypted = Convert.ToBase64String(ms.ToArray())
'Dim decrypted = DecryptAES(encrypted, key)
'If Not EventLog.SourceExists("CryptoBridge") Then
' EventLog.CreateEventSource("CryptoBridge", "CryptoBridge")
'End If
'Dim log As New EventLog
'log.Source = "CryptoBridge"
'log.WriteEntry(clearText & ":" & decrypted)
aes.Clear()
cs.Dispose()
ms.Dispose()
Return encrypted
End Function
Public Function DecryptAES(ByVal base64Cipher As String, ByVal key As String) As String
Dim keyBytes = Convert.FromBase64String(key)
Dim cipherBytes = Convert.FromBase64String(base64Cipher)
' prepare decryption provider
Dim aes = New AesCryptoServiceProvider
aes.Key = keyBytes
aes.Mode = CipherMode.ECB
aes.Padding = PaddingMode.ISO10126
Dim decryptor = aes.CreateDecryptor()
Dim ms = New MemoryStream(cipherBytes)
Dim cs = New CryptoStream(ms, decryptor, CryptoStreamMode.Read)
Dim decryptedBytes As Byte()
ReDim decryptedBytes(cipherBytes.Length)
Dim readByteCount = cs.Read(decryptedBytes, 0, decryptedBytes.Length)
Dim decrypted = Encoding.Unicode.GetString(decryptedBytes, 0, readByteCount)
aes.Clear()
cs.Dispose()
ms.Dispose()
Return decrypted
End Function
接下來,我將修改此代碼以將AES算法提升到256位和CBC密碼模式,這需要初始向量(IV)值。 這增加了實現的復雜程度,我還沒有准備好添加,直到其余部分100%的時間工作。
感謝所有對我的問題發表評論的人。
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