EVP_AEAD_init initializes the context for the given AEAD algorithm.
The implementation argument may be null to choose the default implementation.
Authentication tags may be truncated by passing a tag length. A tag length
of zero indicates the default tag length should be used.
EVP_AEAD_init initializes the context for the given AEAD algorithm. The implementation argument may be null to choose the default implementation. Authentication tags may be truncated by passing a tag length. A tag length of zero indicates the default tag length should be used.