[OpenSSL-1.0.2] TNF local patch - CVE-2017-3736 bn_sqrx8x_internal carry bug on x86_64

[Takehiko NOZAKI]

TNF local patch audit

• crypto/bn/asm/x86_64-mont5.pl

original commit message:

http://mail-index.netbsd.org/source-changes/2018/04/18/msg094491.html

[Takehiko NOZAKI]

BUGFIX: Issue #147 - CVE-2017-3736 bn_sqrx8x_internal carry bug on x86_64

cherry-picked from OpenSSL-1_0_2-stable branch: https://github.com/openssl/openssl/commit/38d600147331d36e74174ebbd4008b63188b321b

original commit message:

bn/asm/x86_64-mont5.pl: fix carry bug in bn_sqrx8x_internal.

Credit to OSS-Fuzz for finding this.

CVE-2017-3736

Reviewed-by: Rich Salz [e-mail]

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