bn/bn_exp.c: constant-time MOD_EXP_CTIME_COPY_FROM_PREBUF.
Performance penalty varies from platform to platform, and even key length. For rsa2048 sign it was observed to reach almost 10%. CVE-2016-0702 Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (cherry picked from master) Resolved conflicts: crypto/bn/bn_exp.c
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