I'm seeing an issue with some code I maintain. The code below has a private static SHA1
member (which is an IDisposable
but since it's static
, it should never get finalized). However, under stress this code throws an exception that suggests it has been closed:
Caught exception. Safe handle has been closed"
Stack trace: Call stack where exception was thrown
at System.Runtime.InteropServices.SafeHandle.DangerousAddRef(Boolean& success)
at System.Security.Cryptography.Utils.HashData(SafeHashHandle hHash, Byte[] data, Int32 cbData, Int32 ibStart, Int32 cbSize)
at System.Security.Cryptography.Utils.HashData(SafeHashHandle hHash, Byte[] data, Int32 ibStart, Int32 cbSize)
at System.Security.Cryptography.HashAlgorithm.ComputeHash(Byte[] buffer)
The code in question is:
internal class TokenCache
{
private static SHA1 _sha1 = SHA1.Create();
private string ComputeHash(string password)
{
byte[] passwordBytes = UTF8Encoding.UTF8.GetBytes(password);
return UTF8Encoding.UTF8.GetString(_sha1.ComputeHash(passwordBytes));
}
My question is obviously what could cause this issue. Can the call to SHA1.Create
fail silently (how many cryptographic resources are available)? Could this be caused by the appdomain going down?
Any other theories?
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