- 2025-07-22 1.0.6 Nuevas funciones de encriptartexto y desencriptartexto

crypt.vb

@@ -1,5 +1,6 @@
 Imports System.IO
 Imports System.Security.Cryptography
+Imports System.Text
 
 Public Class crypt
     Public Shared Function FEncS$(ByVal X$, ByVal Jco0$, ByVal Jcd0$, ByVal Xs0 As Long)
@@ -502,4 +503,61 @@ Public Class crypt
         Return res
 
     End Function
+
+
+
+
+    Private Shared Function GetKey(password As String) As Byte()
+        Using sha256 As SHA256 = SHA256.Create()
+            Return sha256.ComputeHash(Encoding.UTF8.GetBytes(password))
+        End Using
+    End Function
+
+
+    Public Shared Function EncriptarTexto(Texto As String, password As String) As String
+        Dim key As Byte() = GetKey(password)
+        Dim aes As Aes = Aes.Create()
+        aes.Key = key
+        aes.Mode = CipherMode.CBC
+        aes.Padding = PaddingMode.PKCS7
+        aes.GenerateIV()
+
+        Dim iv As Byte() = aes.IV
+        Dim encryptor = aes.CreateEncryptor()
+
+        Dim plainBytes = Encoding.UTF8.GetBytes(Texto)
+        Dim ms As New MemoryStream()
+        ms.Write(iv, 0, iv.Length) ' Guardamos el IV al principio
+        Using cs As New CryptoStream(ms, encryptor, CryptoStreamMode.Write)
+            cs.Write(plainBytes, 0, plainBytes.Length)
+            cs.FlushFinalBlock()
+        End Using
+
+        Return Convert.ToBase64String(ms.ToArray())
+    End Function
+
+    Public Shared Function DesencriptarTexto(Texto As String, password As String) As String
+        Dim fullCipher = Convert.FromBase64String(Texto)
+        Dim key As Byte() = GetKey(password)
+
+        Dim aes As Aes = Aes.Create()
+
+        aes.Key = key
+        aes.Mode = CipherMode.CBC
+        aes.Padding = PaddingMode.PKCS7
+
+        Dim iv(15) As Byte
+        Array.Copy(fullCipher, iv, iv.Length)
+        aes.IV = iv
+
+        Dim decryptor = aes.CreateDecryptor()
+        Dim ms As New MemoryStream()
+        Using cs As New CryptoStream(ms, decryptor, CryptoStreamMode.Write)
+            cs.Write(fullCipher, iv.Length, fullCipher.Length - iv.Length)
+            cs.FlushFinalBlock()
+        End Using
+
+        Return Encoding.UTF8.GetString(ms.ToArray())
+    End Function
+
 End Class