12: Use min supported key len when calling EVP_MAC_init to clear sensitive data

[jon-oracle]

Use appropriate EvpMacCtx release dummy key size.

Also clear the temporary FFM key segment

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Issue

• BRISBANE-12: Use min supported key len when calling EVP_MAC_init to clear sensitive data (Bug - P4)

Reviewers

• Eamon ODea (@eodie - Reviewer)

Reviewing

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[openjdk]

@jon-oracle This change now passes all automated pre-integration checks.

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12: Use min supported key len when calling EVP_MAC_init to clear sensitive data

Reviewed-by: eodea

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[mlbridge]

Webrevs

• 00: Full (b950d17b)

[eodie]

Confirmed that HMAC performance improved by over 70%