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Complete session digest migration from SHA1 to SHA256
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In T12509, we moved away from HMAC-SHA1 for new code. One older workflow still using HMAC-SHA1 is session digests.

In connection with T13222, I'm upgrading these to HMAC-SHA256, but leaving some SHA1 code for compatibility. This should be removed after a reasonable period of time elapses (removing the compatibility code too quickly will log everyone out).