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a06525649d
While most of the code associated with secp256k1 operations had been migrated to libsecp256k1, the deterministic key derivation code was still using calls to OpenSSL. If merged, this commit replaces the OpenSSL-based routines with new libsecp256k1-based implementations. No functional change is expected and the change should be transparent. This commit also removes several support classes and utility functions that wrapped or adapted various OpenSSL types that are no longer needed. A tip of the hat to the original author of this truly superb library, Dr. Pieter Wuille, and to all other contributors.