Mark Johnston 09bfa5cf16 opencrypto: Add a routine to copy a crypto buffer cursor
This was useful in converting armv8crypto to use buffer cursors.  There
are some cases where one wants to make two passes over data, and this
provides a way to "reset" a cursor.

Reviewed by:	jhb
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D28949
2022-02-15 21:47:10 -05:00
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