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Backport an algorithmic change to grub_crypto_memcmp() so that it completes in constant time and thus isn't susceptible to side-channel attacks. (From OE-Core rev: 319210be147ec57518c237cb705857aeda9943e6) Signed-off-by: Ross Burton <ross.burton@arm.com> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> (cherry picked from commit 30a1cc225a2bd5d044bf608d863a67df3f9c03be) Signed-off-by: Shubham Pushpkar <spushpka@cisco.com> Signed-off-by: Steve Sakoman <steve@sakoman.com>