wolfTPM2: harden PCR/hash wrapper validation#554
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- ReadPCR: reject an empty response (count == 0) before dereferencing digests[0] - HashStart: reject any non-hash algorithm (digest size 0), not just TPM_ALG_NULL - ExtendPCR / ResetPCR: bound pcrIndex to [PCR_FIRST, PCR_LAST], matching ReadPCR
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Defensive-validation improvements in the PCR/hash wrappers:
reading digests[0] uninitialized.
TPM2_GetHashDigestSize(), not only TPM_ALG_NULL.
No API change; builds clean.