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fix bug with handling of more than 256 bytes

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This commit is contained in:
Eliot Jones 2022-04-03 15:20:42 -04:00
parent 347259eaa5
commit 3ab0883cf3
1 changed files with 12 additions and 6 deletions
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18
src/UglyToad.PdfPig/Encryption/AesEncryptionHelper.cs
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@ -1,6 +1,7 @@
namespace UglyToad.PdfPig.Encryption
{
using System;
using System.Diagnostics;
using System.IO;
using System.Security.Cryptography;
@ -20,7 +21,7 @@
var iv = new byte[16];
Array.Copy(data, iv, iv.Length);
using (var rijndael = Rijndael.Create())
{
rijndael.Key = finalKey;
@ -28,6 +29,11 @@
var buffer = new byte[256];
if (data.Length > 256)
{
Debugger.Break();
}
using (var decryptor = rijndael.CreateDecryptor(rijndael.Key, rijndael.IV))
using (var input = new MemoryStream(data))
using (var output = new MemoryStream())
@ -35,15 +41,15 @@
input.Seek(iv.Length, SeekOrigin.Begin);
using (var cryptoStream = new CryptoStream(input, decryptor, CryptoStreamMode.Read))
{
var offset = 0;
int read;
do
{
read = cryptoStream.Read(buffer, offset, buffer.Length - offset);
read = cryptoStream.Read(buffer, 0, buffer.Length);
output.Write(buffer, offset, read);
offset += read;
if (read > 0)
{
output.Write(buffer, 0, read);
}
} while (read > 0);
return output.ToArray();