Do not clone empty arrays in CloneByteArray #93231
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Tagging subscribers to this area: @dotnet/area-system-security, @bartonjs, @vcsjones Issue Details
If its empty, just return the identity to save the allocation.
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filipnavara
approved these changes
Oct 9, 2023
vcsjones
commented
Oct 9, 2023
src/libraries/Common/src/System/Security/Cryptography/Helpers.cs
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bartonjs
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Oct 9, 2023
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Failure is tracked in #93229. Merging. |
stephentoub
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Oct 10, 2023
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| return src switch | ||
| { | ||
| return null; | ||
| } | ||
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| return (byte[])(src.Clone()); | ||
| null => null, | ||
| { Length: 0 } => src, | ||
| _ => (byte[])src.Clone(), | ||
| }; |
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FWIW, it could also have been:
return src is not null ? src.AsSpan().ToArray() : null;and let span's ToArray handle the empty case via Array.Empty.
ghost
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CloneByteArrayis used heavily in S.S.Cryptography to create defensive copies of byte arrays. This is to avoid exposing any kind of mutability to callers.Clonehowever appears to create a newbyte[]for empty byte arrays every time. Empty arrays are not uncommon. It could be for a CNG property, it could be for key parameters, or otherAsnEncodedData.If its empty, just return the identity to save the allocation.