tari-project / tari-crypto / 6639828365

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fix!: improve zeroizing support (#209)

This adds `Zeroize` and `ZeroizeOnDrop` to `ExtendedMask` and
`ExtendedWitness` for improved memory handling functionality. It
restricts the visibility of an internal commitment constructor and adds
zeroizing to temporary secret values. It updates secret key
deserialization to add zeroizing to a temporary byte array. Finally, it
removes a secret key constructor.

Supersedes #204.

BREAKING CHANGE: Changes the commitment and secret key APIs.

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