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Use vectorized SequenceEqual method

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Jason Nelson 2024-03-14 11:17:24 -07:00 committed by BobLd
parent 907181d5ce
commit a97ee27030
1 changed files with 4 additions and 4 deletions
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8
src/UglyToad.PdfPig/Encryption/EncryptionHandler.cs
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@ -209,10 +209,10 @@
if (encryptionDictionary.Revision >= 3) if (encryptionDictionary.Revision >= 3)
{ {
return encryptionDictionary.UserBytes.Take(16).SequenceEqual(output.Take(16)); return encryptionDictionary.UserBytes.AsSpan(0, 16).SequenceEqual(output.AsSpan(0, 16));
} }
return encryptionDictionary.UserBytes.SequenceEqual(output); return encryptionDictionary.UserBytes.AsSpan().SequenceEqual(output);
} }
private static bool IsUserPasswordRevision5And6(byte[] passwordBytes, EncryptionDictionary encryptionDictionary) private static bool IsUserPasswordRevision5And6(byte[] passwordBytes, EncryptionDictionary encryptionDictionary)
@ -270,7 +270,7 @@
// 4. Create an RC4 encryption key using the first n bytes of the output from the final MD5 hash, // 4. Create an RC4 encryption key using the first n bytes of the output from the final MD5 hash,
// where n is always 5 for revision 2 but for revision 3 or greater depends on the value of the encryption dictionary's Length entry. // where n is always 5 for revision 2 but for revision 3 or greater depends on the value of the encryption dictionary's Length entry.
var key = hash.Take(length).ToArray(); var key = hash.AsSpan(0, length).ToArray();
if (encryptionDictionary.Revision == 2) if (encryptionDictionary.Revision == 2)
{ {
@ -615,7 +615,7 @@
{ {
for (var i = 0; i < 50; i++) for (var i = 0; i < 50; i++)
{ {
input = newMd5.ComputeHash(input.Take(n).ToArray()); input = newMd5.ComputeHash(input.AsSpan(0, n).ToArray());
} }
} }