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* os400: minimum supported OS version is now V6R1. Do not log compiler informational messages. * Implement crypto backend specific Diffie-Hellman computation. This feature is now needed on os400 because the QC3 library does not implement bn_mod_exp() natively. Up to now, this function was emulated using an RSA encryption, but commitsca5222ea81and7934c9ce2a(CVE-2016-0787) broke the emulation because QC3 only supports RSA exponents up to 512 bits. Happily, QC3 supports a native API for Diffie-Hellman computation, with opaque random value: this commit implements the use of this API and, as a side effect, enables support of this feature for any other crypto backend that would use it. A "generic" Diffie-Hellman computation internal API supports crypto backends not implementing their own: this generic API uses the same functions as before. * Fix typos in docs/HACKING.CRYPTO.