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Support decrypting AES data where only IV is present

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This commit is contained in:
Arnaud TAMAILLON 2024-09-01 09:58:43 +02:00 committed by BobLd
parent 4f2a0976e3
commit 68e48d04f0
3 changed files with 52 additions and 1 deletions
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9
src/UglyToad.PdfPig.Tests/Integration/EncryptedDocumentTests.cs
View File

@ -54,6 +54,15 @@
}
}
[Fact]
public void CanReadDocumentWithEmptyStringEncryptedWithAESEncryptionAndOnlyIV()
{
using (var document = PdfDocument.Open(IntegrationHelpers.GetSpecificTestDocumentPath("r4_aes_empty_string.pdf")))
{
Assert.Empty(document.Information.Producer);
}
}
private static string GetPath() => IntegrationHelpers.GetSpecificTestDocumentPath(FileName);
}
}

37
src/UglyToad.PdfPig.Tests/Integration/SpecificTestDocuments/r4_aes_empty_string.pdf Normal file
View File

@ -0,0 +1,37 @@
%PDF-1.6
%<25><><EFBFBD><EFBFBD>
1 0 obj
<< /Pages 3 0 R /Type /Catalog >>
endobj
2 0 obj
<< /Producer <03bc09515c7aad3ceab79dbea68b7802> >>
endobj
3 0 obj
<< /Count 1 /Kids [ 4 0 R ] /MediaBox [ 0 0 595 792 ] /Type /Pages >>
endobj
4 0 obj
<< /Contents 5 0 R /Parent 3 0 R /Resources << >> /Type /Page >>
endobj
5 0 obj
<< /Length 96 /Filter /FlateDecode >>
stream
TnH,έۻy<DBBB>P0<50><30>oX̡<58><CCA1>xbh<62><68><EFBFBD>v<EFBFBD><76><EFBFBD> <05><><EFBFBD><EFBFBD>
<EFBFBD>
&j<><6A><EFBFBD><EFBFBD>D<EFBFBD>+?<3F><><EFBFBD>╠<1A><><EFBFBD>k|l<><6C>BI<42><49><14><>GT<47><54><EFBFBD>˵st<07><06> <0C>`ʃendstream
endobj
6 0 obj
<< /CF << /StdCF << /AuthEvent /DocOpen /CFM /AESV2 /Length 16 >> >> /Filter /Standard /Length 128 /O <566fa873ee33c797cd3b904fdadf814afa34df9a38f6ed41b984e2c6da2aa6f5> /P -4 /R 4 /StmF /StdCF /StrF /StdCF /U <5b93af90588464e45bf20276ec6af5a10122456a91bae5134273a6db134c87c4> /V 4 >>
endobj
xref
0 7
0000000000 65535 f
0000000023 00000 n
0000000072 00000 n
0000000138 00000 n
0000000223 00000 n
0000000303 00000 n
0000000544 00000 n
trailer << /Info 2 0 R /Root 1 0 R /Size 7 /ID [<5f94b739445b583b745423be6658e8fb><5f94b739445b583b745423be6658e8fb>] /Encrypt 6 0 R >>
startxref
843
%%EOF

7
src/UglyToad.PdfPig/Encryption/AesEncryptionHelper.cs
View File

@ -27,7 +27,12 @@
aes.IV = iv;
#if NET8_0_OR_GREATER
return aes.DecryptCbc(data.AsSpan(iv.Length), iv, PaddingMode.PKCS7);
var encryptedData = data.AsSpan(iv.Length);
if (encryptedData.IsEmpty)
{
return [];
}
return aes.DecryptCbc(encryptedData, iv, PaddingMode.PKCS7);
#else
var buffer = new byte[256];