50 lines
1.9 KiB
Markdown
50 lines
1.9 KiB
Markdown
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## AesCrytpServiceProvider decryptor provides a reusable transform
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### Scope
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Minor
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### Version Introduced
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4.6.2
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### Source Analyzer Status
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Investigating
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### Change Description
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Starting with apps that target the .NET Framework 4.6.2, the `T:System.Security.Cryptography.AesCryptoServiceProvider` decryptor provides a reusable transform. After a call to `TransformFinalBlock`, the transform is reinitialized and can be reused.
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For apps that target earlier versions of the .NET Framework, attempting to reuse the decryptor by calling `TransformBlock` after a call to `TransformFinalBlock` throws a `T:System.Security.Cryptography.CryptographicException` or produces corrupted data.
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- [X] Quirked AppContext or config files. Needs to be turned on automatically for some situations.
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- [ ] Build-time break
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### Recommended Action
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The impact of this change should be minimal, since this is the expected behavior.
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Applications that depend on the previous behavior can opt out of it using it by adding the following configuration setting to the `<runtime>` section of the application's configuration file:
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```xml
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<runtime>
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<AppContextSwitchOverrides value="Switch.System.Security.Cryptography.AesCryptoServiceProvider.DontCorrectlyResetDecryptor=true"/>
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</runtime>
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```
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In addition, applications that target a previous version of the .NET Framework but are running under a version of the .NET Framework starting with .NET Framework 4.6.2 can opt in to it by adding the following configuration setting to the `<runtime>` section of the application's configuration file:
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```xml
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<runtime>
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<AppContextSwitchOverrides value="Switch.System.Security.Cryptography.AesCryptoServiceProvider.DontCorrectlyResetDecryptor=false"/>
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</runtime>
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```
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### Affected APIs
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- `M:System.Security.Cryptography.AesCryptoServiceProvider.CreateDecryptor`
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### Category
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Core
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<!--
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### Original Bug
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205301
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-->
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<!-- breaking change id: 165 -->
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