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:param email: User email.
:param password: User password.
:param salt: Optional salt to use (must be 16 bytes long). If none is given, compute salt
from email as ``salt = SHA256(email)[:16]``.
:return: The computed private key material (256b, 32 octets).
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Expand ``pkm`` and ``context`` into a key of length ``bytes`` using
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:param pkm:
:param context:
:param salt:
:return:
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