Fix reading encryption byte strings

src/UglyToad.PdfPig.Tests/Integration/EncryptedDocumentTests.cs

@@ -45,6 +45,15 @@
             }
         }
 
+        [Fact]
+        public void CanReadDocumentWithUEAsString()
+        {
+            using (var document = PdfDocument.Open(IntegrationHelpers.GetSpecificTestDocumentPath("string_encryption_key.pdf")))
+            {
+                Assert.NotNull(document.Information.Producer);
+            }
+        }
+
         private static string GetPath() => IntegrationHelpers.GetSpecificTestDocumentPath(FileName);
     }
 }

src/UglyToad.PdfPig.Tests/Integration/SpecificTestDocuments/string_encryption_key.pdf

@@ -0,0 +1,35 @@
+%PDF-1.7
+%¿÷¢þ
+1 0 obj
+<< /Extensions << /ADBE << /BaseVersion /1.7 /ExtensionLevel 3 >> >> /Pages 3 0 R /Type /Catalog >>
+endobj
+2 0 obj
+<< /Producer <094f2e2e17e0eaa7fa21d7c01663d1642459a0e93ee2a2444ff6c3d9f606174a> >>
+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
+LŹ}ã?r[ NSüùZÕ’lRãë›f\EMðv`W‡%eK7""ÚÉ«@ä|<7C>ãÂÕe>שÆùê‡S¬Pm@”NïzÚ ‚ôc?èO¾L:m@Ïb1èTSÝú ê>Hîendstream
+endobj
+6 0 obj
+<< /CF << /StdCF << /AuthEvent /DocOpen /CFM /AESV3 /Length 32 >> >> /Filter /Standard /Length 256 /O <d93934d437eeefbe1d8f2c39179cf812a3a4c43b1bd58f3ffe6763f138d7f8ddbf5faa0552aa56e74e114d84b0280747> /OE <044007a2a9644d0c667f72665ae3eead400aa9a23671ef4c9991fe14ed7280c7> /P -4 /Perms <277a011382b0391bf31eb823942f104c> /R 5 /StmF /StdCF /StrF /StdCF /U <7dd74a14323c21b7b34cebd93864a73abd9d2c97bc0dd0c5bbaf699e3ae1a240d89a022bb1a897b60d9269403d5d337d> /UE (íXi€2/u·‡§SlЀŽwò$Çf¡Ê¡÷ÀkÝ|ü©ìz) /V 5 >>
+endobj
+xref
+0 7
+0000000000 65535 f 
+0000000015 00000 n 
+0000000130 00000 n 
+0000000228 00000 n 
+0000000313 00000 n 
+0000000393 00000 n 
+0000000559 00000 n 
+trailer << /Info 2 0 R /Root 1 0 R /Size 7 /ID [<d9cc8dbe74307dd36f8a6b251c4ec862><d9cc8dbe74307dd36f8a6b251c4ec862>] /Encrypt 6 0 R >>
+startxref
+1074
+%%EOF

src/UglyToad.PdfPig/Encryption/EncryptionDictionaryFactory.cs

@@ -3,6 +3,8 @@
     using System;
     using System.Linq;
     using Core;
+    using System.Diagnostics;
+    using System.Threading;
     using Tokenization.Scanner;
     using Tokens;
     using Util;
@@ -97,7 +99,7 @@
             var name = isUser ? NameToken.Ue : NameToken.Oe;
             if (encryptionDictionary.TryGet(name, tokenScanner, out StringToken? stringToken))
             {
-                return OtherEncodings.StringAsLatin1Bytes(stringToken.Data);
+                return stringToken.GetBytes();
             }
 
             if (encryptionDictionary.TryGet(name, tokenScanner, out HexToken? hexToken))