易语言aes加密

易语言中可以通过调用 Windows API 来实现 AES 加密。以下是一个示例代码：

'定义 API 函数
Declare Function CryptAcquireContext Lib "advapi32.dll" Alias _
    "CryptAcquireContextA" (ByRef phProv As Long, ByVal pszContainer As String, _
    ByVal pszProvider As String, ByVal dwProvType As Long, ByVal dwFlags As Long) As Long

Declare Function CryptCreateHash Lib "advapi32.dll" (ByRef hProv As Long, _
    ByVal Algid As Long, ByVal hKey As Long, ByVal dwFlags As Long, ByRef phHash As Long) As Long

Declare Function CryptHashData Lib "advapi32.dll" (ByVal hHash As Long, _
    ByVal pbData As Long, ByVal dwDataLen As Long, ByVal dwFlags As Long) As Long

Declare Function CryptDeriveKey Lib "advapi32.dll" (ByVal hProv As Long, _
    ByVal Algid As Long, ByVal hBaseData As Long, ByVal dwFlags As Long, ByRef phKey As Long) As Long

Declare Function CryptEncrypt Lib "advapi32.dll" (ByVal hKey As Long, _
    ByVal hHash As Long, ByVal Final As Long, ByVal dwFlags As Long, ByVal pbData As Long, _
    ByRef pdwDataLen As Long, ByVal dwBufLen As Long) As Long

'定义常量
Const PROV_RSA_AES = 24
Const CRYPT_MODE_CBC = 1
Const CALG_AES_256 = 26128

'定义变量
Dim hProv As Long
Dim hHash As Long
Dim hKey As Long
Dim strText As String
Dim strKey As String
Dim bText() As Byte
Dim bKey() As Byte
Dim bIV() As Byte
Dim i As Long

'初始化变量
strText = "Hello, world!"
strKey = "my secret key"
ReDim bText(Len(strText) - 1) As Byte
ReDim bKey(Len(strKey) - 1) As Byte
ReDim bIV(15) As Byte '128位 IV

'转换字符串为字节数组
For i = 0 To UBound(bText)
    bText(i) = Asc(Mid(strText, i + 1, 1))
Next

For i = 0 To UBound(bKey)
    bKey(i) = Asc(Mid(strKey, i + 1, 1))
Next

'获取加密提供程序的句柄
If CryptAcquireContext(hProv, vbNullString, vbNullString, PROV_RSA_AES, 0) = 0 Then
    MsgBox "无法获取加密提供程序的句柄"
    Exit Sub
End If

'创建哈希对象
If CryptCreateHash(hProv, CALG_AES_256, 0, 0, hHash) = 0 Then
    MsgBox "无法创建哈希对象"
    Exit Sub
End If

'将密钥数据导入哈希对象
If CryptHashData(hHash, VarPtr(bKey(0)), UBound(bKey) + 1, 0) = 0 Then
    MsgBox "无法导入密钥数据"
    Exit Sub
End If

'导出哈希值并创建密钥对象
If CryptDeriveKey(hProv, CALG_AES_256, hHash, 0, hKey) = 0 Then
    MsgBox "无法创建密钥对象"
    Exit Sub
End If

'加密数据
If CryptEncrypt(hKey, 0, True, CRYPT_MODE_CBC, VarPtr(bText(0)), UBound(bText) + 1, UBound(bText) + 1) = 0 Then
    MsgBox "加密失败"
    Exit Sub
End If

'输出加密结果
For i = 0 To UBound(bText)
    Debug.Print Hex(bText(i));
Next

在上面的示例代码中，我们使用了 AES-256 加密算法和 CBC 模式。加密过程包括以下步骤：

1. 获取加密提供程序的句柄
2. 创建哈希对象，并将密钥数据导入哈希对象
3. 导出哈希值并创建密钥对象
4. 加密数据

需要注意的是，AES 加密需要一个 128 位的初始化向量（IV），我们在代码中将其初始化为 16 个 0。在实际应用中，需要根据具体需求生成随机的 IV。