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.NET’s AES does not implement CTR directly. It only implements CBC, CFB, CTS, ECB and OFB.
Can I use any of these modes and securely implement CTR around them, or do I need to use a different library altogether?
Yes, you can build a CTR using .NET’s AES in ECB mode and a counter, that you yourself initialize and increment, for each block encrypted.
An example of this is the WinZipAes encryption stream, which is part of the open-source DotNetZip.
WinZip specifies the use of AES encryption for encrypted ZIP files, using AES in CTR mode. DotNetZip implements the CTR mode using ECB and the counter.
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