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Merge pull request #321 from UglyToad/decrypted-string-encoding-support

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correctly detect encrypted string encoding when decrypting #313
This commit is contained in:
Eliot Jones
2021-04-30 13:29:51 -04:00
committed by GitHub
parent c2f2916c04 c7c4adf441
commit d7f7fb5fd0
1 changed files with 20 additions and 1 deletions
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21
src/UglyToad.PdfPig/Encryption/EncryptionHandler.cs
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@@ -402,7 +402,7 @@
var decrypted = DecryptData(data, reference); var decrypted = DecryptData(data, reference);
token = new StringToken(OtherEncodings.BytesAsLatin1String(decrypted)); token = GetStringTokenFromDecryptedData(decrypted);
break; break;
} }
@@ -465,6 +465,25 @@
return token; return token;
} }
private static StringToken GetStringTokenFromDecryptedData(byte[] data)
{
if (data[0] == 0xFE && data[1] == 0xFF)
{
var str = Encoding.BigEndianUnicode.GetString(data).Substring(1);
return new StringToken(str, StringToken.Encoding.Utf16BE);
}
if (data[0] == 0xFF && data[1] == 0xFE)
{
var str = Encoding.Unicode.GetString(data).Substring(1);
return new StringToken(str, StringToken.Encoding.Utf16);
}
return new StringToken(OtherEncodings.BytesAsLatin1String(data), StringToken.Encoding.Iso88591);
}
private byte[] DecryptData(byte[] data, IndirectReference reference) private byte[] DecryptData(byte[] data, IndirectReference reference)
{ {
if (useAes && encryptionKey.Length == 32) if (useAes && encryptionKey.Length == 32)