Android Question Reading encrypted string and decoding it into a string array

Stephen A Wolfe · Mar 22, 2018

Here's some code I have:

B4X:

    Dim ReadString As String
    Dim EncryptedString As Object
    Dim MyPhone As PhoneId
And...
    EncryptedString = File.ReadString(File.DirRootExternal, "MyFolder/MyFile.txt")
    ReadString = DecryptText(EncryptedString, MyPhone.GetDeviceId)
    FileLoc = Regex.Split(CRLF, ReadString)
    Msgbox(FileLoc(1), "The line of decoded array I need")

I'm getting an error "String cannot be cast to Byte". It seems like this should work. The error occurs for the decrypt line. I am saving the file using the reverse method (
File.WriteString(File.DirRootExternal, "MyFolder/MyFile.txt", EncryptedString)

I have tried so many different things and am completely stumped.

OliverA · Mar 22, 2018

Stephen A Wolfe said:
I'm getting an error "String cannot be cast to Byte"

Post the code for DecryptText

Stephen A Wolfe · Mar 22, 2018

OliverA said:
Post the code for DecryptText

Ooops, sorry. Here it is:

B4X:

Sub DecryptText(EncryptedData() As Byte, password As String) As String
    Dim c As B4XCipher
    Dim b() As Byte = c.Decrypt(EncryptedData, password)
    Return BytesToString(b, 0, b.Length, "utf8")
End Sub

DonManfred · Mar 22, 2018

OliverA said:
Post the code for DecryptText

https://www.b4x.com/android/forum/t...ion-with-custom-passphrase.90829/#post-574407

Stephen A Wolfe · Mar 22, 2018

DonManfred said:
https://www.b4x.com/android/forum/t...ion-with-custom-passphrase.90829/#post-574407

I was asked to start a new thread.

OliverA · Mar 22, 2018

@DonManfred: As you can see, he did not use @Erel's code. @Stephen A Wolfe : Please use @Erel's code, not yours.

DonManfred · Mar 22, 2018

Stephen A Wolfe said:
I was asked to start a new thread.

This is correct. I just posted the link to the source Erel gave to you to show it to @OliverA

OliverA · Mar 22, 2018

DonManfred said:
Erel gave to you to show it to @OliverA

Thanks! I actually was keeping up with that thread, that is why I asked for his code, since the error message would have made no sense with @Erel's code.

Stephen A Wolfe · Mar 22, 2018

OliverA said:
@DonManfred: As you can see, he did not use @Erel's code. @Stephen A Wolfe : Please use @Erel's code, not yours.

Thank you. This is finally working as it should. I was unaware my subs were different, but they were. This explains why I was having issues. All of you are great, thanks I can now complete this project.

Android Question Reading encrypted string and decoding it into a string array

Stephen A Wolfe

Member

OliverA

Expert

Stephen A Wolfe

Member

DonManfred

Expert

Stephen A Wolfe

Member

OliverA

Expert

DonManfred

Expert

OliverA

Expert

Stephen A Wolfe

Member

Similar Threads

Android Question Reading encrypted string and decoding it into a string array

Member

Expert

Member

Expert

Member

Expert

Expert

Expert

Member

Similar Threads

Privacy & Transparency

Privacy & Transparency