Fix FIPS integrity failed test on aarch.

[bryce-shang]

Issues:

Addresses CryptoAlg-723

Description of changes:

This PR is to fix FIPS integrity failed test when building and testing awslc with -DBUILD_SHARED_LIBS=1 -DFIPS=1 on aarch.

The FIPS integrity test failed because sha512 (instead of sha256) is used by inject_hash.go, but bcm.c uses sha256 on aarch. Verified, inject_hash.go and bcm.c use the same key and bytes to call the hash function.

Call-outs:

• This is POC(Proof of Concept) of FIPS shared build on aarch. The POC uses Clang-7. Other compilers are not tested yet.
• Another PR will be published to make FIPS static build working on aarch.
  • After that, CI integration PR will be sent out.

Testing:

aarch-fips-shared-build-test-log.out is attached to CryptoAlg-723.

#!/bin/bash -ex
# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0
export CC=clang-7
export CXX=clang++-7

source tests/ci/common_posix_setup.sh

echo "Testing shared AWS-LC in FIPS debug mode."
fips_build_and_test -DBUILD_SHARED_LIBS=1

echo "Testing shared AWS-LC in FIPS release mode."
fips_build_and_test -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=1

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.