Add check on cpp version for kSha256DigestLength
Add check on cpp version for kSha256DigestLength

PiperOrigin-RevId: 319065985
Change-Id: I07189f23d5140dc15e1554c783421c88a55ce9e5

google/asylo,google/asylo,google/asylo,google/asylo,google/asylo,google/asylo