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feat: add freebsd support

feat: add Equal method to compare keys

Closes #125

* ed gen, sign, verify works. tested25519 fails
* Ignore some unit tests in ED since it relies on GoLang lib to support Ed keys
* Cleanup sign and verify operations
* Cleanup and prettify
* cleanups
* Conditional X_EVP_PKEY_ED25519 and  X_EVP_Digest{Sign|Verify}[Init] based on openssl version.

closes #61

Go can use 16 bytes to store an IPv4 address in a net.IP so it needs to
be converted to a 4-byte representation first.

This reverts commit 6eae62b0.
This reverts commit baa1f625.

Leaves in the removal of -w from the darwin LDFLAGS as it is still
problematic on 1.9.5 and 1.10.1.

Make test confom to new requirement enforced in go 1.10 https://tip.golang.org/doc/go1.10#test. With out this change tests will always fails with go 1.10+.

Fix incompatiblities with OpenSSL 1.0.x

cgo starts exiting when pkg-config doesn't work, so limit calling
pkg-config to linux and windows.

we also need to specify -lssl and -lcrypto in the linker flags
when we don't have pkg-config

this way if you don't have openssl@1.1 installed, it doesn't complain at you