Squashed commit of the following:

commit 0a40e209d03e8ff9b6f81cd5969d3e845c633bfc
Author: vnugent <public@vaughnnugent.com>
Date:   Sat May 4 13:55:19 2024 -0400

    ci: Force disable testing for win ci builds

commit 55fae189fffc86f07a3448370f0a746670819712
Author: vnugent <public@vaughnnugent.com>
Date:   Thu May 2 21:54:35 2024 -0400

    feat: Working and tested openssl impl & defaults

commit 6ff8bb11774c51fd341b7699a3938fd894995fbf
Author: vnugent <public@vaughnnugent.com>
Date:   Thu Apr 25 17:45:42 2024 -0400

    refactor: Finish support and testing for mbedtls

commit 7cb7a93de4f6f5e741bc5129e3d928e44f050930
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Apr 23 18:19:31 2024 -0400

    refactor!: MbedTLS on Windows, switch to uint32

commit 30e8dda6cbea86bdee6d5dfe48514385d3b9f81b
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Apr 23 14:48:05 2024 -0400

    refactor: Crypto dep redesign working on Windows

commit d09c6c1bd5da3e2d79351daeba304ca99976a726
Author: vnugent <public@vaughnnugent.com>
Date:   Thu Apr 18 00:28:51 2024 -0400

    refactor!: Pushing what I have to dev

commit 54e06ada7d624ed0d28c6a6db04a149708841bf8
Author: vnugent <public@vaughnnugent.com>
Date:   Sat Apr 13 01:24:00 2024 -0400

    fix: convert constants to hex, inline macro, ParseErrorCode

commit 4215e3100d9a0d23119080d09638fa5b60d0c6d4
Merge: d3328f4 7485aa5
Author: vnugent <public@vaughnnugent.com>
Date:   Wed Apr 3 18:26:30 2024 -0400

    Merge branch 'master' into develop

commit d3328f4152b22b28f24c43dda62464287f1efff5
Author: vnugent <public@vaughnnugent.com>
Date:   Wed Apr 3 18:22:56 2024 -0400

    build: Included dependency and versions in client builds

commit b11bc0bac955fd5c6db65f0da48456bf5e748805
Author: vnugent <public@vaughnnugent.com>
Date:   Wed Apr 3 18:10:08 2024 -0400

    fix: Fix c89 compatabilty comments and struct assignment

commit 9915bd41799a72413e6b400e150aa9f5fa797e25
Merge: 8e3d6ea 5184d7d
Author: vnugent <public@vaughnnugent.com>
Date:   Sat Mar 30 09:57:30 2024 -0400

    Merge branch 'master' into develop

commit 8e3d6ea5e3c83fe42cb904b6ccc4fe2b73f76aae
Author: vnugent <public@vaughnnugent.com>
Date:   Sat Mar 30 09:52:55 2024 -0400

    refactor!: Some api (struct) changes and updated tests

commit e88e8420520204e20802516f01d4488bb0b1d6ea
Merge: 490dfee 21f6c0a
Author: vnugent <public@vaughnnugent.com>
Date:   Sun Mar 3 15:02:34 2024 -0500

    Merge branch 'master' into develop

commit 490dfee4ef22479009627435c6ad728c3cbbab54
Author: vnugent <public@vaughnnugent.com>
Date:   Sun Mar 3 14:59:25 2024 -0500

    test: #3 tests for encryption/description and Macs

commit efa97490b7ed47f4e2f05bee52e2b33e14e439e6
Merge: 1b84e3c 120022a
Author: vnugent <public@vaughnnugent.com>
Date:   Sun Mar 3 14:55:48 2024 -0500

    merge master

commit 1b84e3c7c2e55b1ff9ffdd09b66873e11c131441
Author: vnugent <public@vaughnnugent.com>
Date:   Sat Mar 2 22:57:36 2024 -0500

    fix: #2 constent usage of sizeof() operator on struct types

commit 9de5a214c66adea0ef2d0bac63c59449de202a88
Author: vnugent <public@vaughnnugent.com>
Date:   Fri Mar 1 14:30:36 2024 -0500

    perf: avoid nc_key struct copy, cast and verify instead

commit b917b761120ed684af28d0707673ffadcf14b8fe
Author: vnugent <public@vaughnnugent.com>
Date:   Mon Feb 12 22:06:50 2024 -0500

    fix: found the constant time memcompare function

commit 9f85fff3b9f25da7410569ea94f994b88feb3910
Author: vnugent <public@vaughnnugent.com>
Date:   Fri Feb 9 22:48:35 2024 -0500

    feat: added/update MAC functions to sign or verify nip44 payload

commit aa5113741bb419b02d6ea416bba571fa3d65db46
Author: vnugent <public@vaughnnugent.com>
Date:   Wed Feb 7 01:37:53 2024 -0500

    add missing hmac-key output buffer

commit 55f47d22cc9ce4d1e22b70814d608c7ef3b1bbc9
Author: vnugent <public@vaughnnugent.com>
Date:   Sun Feb 4 21:08:13 2024 -0500

    simple bug fixes, and public api argument validation tests

commit 73c5a713fb164ae8b4ac8a891a8020e08eae0a3b
Author: vnugent <public@vaughnnugent.com>
Date:   Fri Feb 2 23:05:48 2024 -0500

    update api to return secpvalidate return code instead of internal return codes

commit 06c73004e1a39a7ea4ea3a89c22dee0f66adb236
Author: vnugent <public@vaughnnugent.com>
Date:   Fri Feb 2 19:25:17 2024 -0500

    change to lgpl license

commit 6e79fdb3b6b6739fc7797d47e55a7691306cf736
Author: vnugent <public@vaughnnugent.com>
Date:   Wed Jan 31 21:30:49 2024 -0500

    move validation macros, and optionally disable them

commit ac1e58837f1ba687939f78b5c03cadd346c10ddd
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Jan 30 12:25:05 2024 -0500

    couple more tests, renable range checks, set flags for all projects

1 files changed, 180 insertions, 0 deletions

diff --git a/src/crypto/impl/openssl.c b/src/crypto/impl/openssl.c
new file mode 100644
index 0000000..fd3b4e6
--- /dev/null
+++ b/src/crypto/impl/openssl.c
@@ -0,0 +1,180 @@
+/*
+* Copyright (c) 2024 Vaughn Nugent
+*
+* Package: noscrypt
+* File: impl/openssl.c
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public License
+* as published by the Free Software Foundation; either version 2.1
+* of the License, or  (at your option) any later version.
+*
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public License
+* along with noscrypt. If not, see http://www.gnu.org/licenses/.
+*/
+
+
+/* Setup openssl */
+#ifdef OPENSSL_CRYPTO_LIB
+
+#include "nc-util.h"
+#include <openssl/crypto.h>
+
+#define _OSSL_FAIL(x) if(!(x)) return CSTATUS_FAIL;
+
+#ifndef _IMPL_SECURE_ZERO_MEMSET
+
+	#define _IMPL_SECURE_ZERO_MEMSET			_ossl_secure_zero_memset
+
+	_IMPLSTB void _ossl_secure_zero_memset(void* ptr, size_t size)
+	{
+		_overflow_check(size)
+
+		OPENSSL_cleanse(ptr, size);
+	}
+#endif
+
+#ifndef _IMPL_CRYPTO_FIXED_TIME_COMPARE
+
+	#define _IMPL_CRYPTO_FIXED_TIME_COMPARE		_ossl_fixed_time_compare
+
+	_IMPLSTB uint32_t _ossl_fixed_time_compare(const uint8_t* a, const uint8_t* b, uint32_t size)
+	{
+		int result;
+
+		/* Size checks are required for platforms that have integer sizes under 32bit */
+		_overflow_check(size)
+
+		result = CRYPTO_memcmp(a, b, size);
+
+		return (uint32_t)result;
+	}
+
+#endif /* _IMPL_CRYPTO_FIXED_TIME_COMPARE */
+
+
+#ifndef _IMPL_CRYPTO_SHA256_DIGEST	
+
+	#include <openssl/sha.h>
+
+	#define _IMPL_CRYPTO_SHA256_DIGEST			_ossl_sha256_digest	
+
+	_IMPLSTB cstatus_t _ossl_sha256_digest(const cspan_t* data, sha256_t digestOut32)
+	{
+		_overflow_check(data->size)
+
+		_OSSL_FAIL(SHA256(data->data, data->size, digestOut32))
+
+		return CSTATUS_OK;
+	}
+
+#endif
+
+#ifndef _IMPL_CRYPTO_SHA256_HMAC
+
+	#include <openssl/hmac.h>
+
+	/* Export function */
+	#define _IMPL_CRYPTO_SHA256_HMAC			_ossl_hmac_sha256	
+	
+	_IMPLSTB cstatus_t _ossl_hmac_sha256(const cspan_t* key, const cspan_t* data, sha256_t hmacOut32)
+	{
+		unsigned int hmacLen;
+
+		_overflow_check(key->size)
+		_overflow_check(data->size)
+
+		hmacLen = sizeof(sha256_t);
+
+		_OSSL_FAIL(
+			HMAC(
+				EVP_sha256(),
+				key->data,
+				key->size,
+				data->data,
+				data->size,
+				hmacOut32,
+				&hmacLen
+			)
+		)
+		
+		/* digest length should match the actual digest size */
+		DEBUG_ASSERT(hmacLen == sizeof(sha256_t))
+
+		return CSTATUS_OK;
+	}
+
+#endif /* !_IMPL_CRYPTO_SHA256_HMAC */
+
+#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXPAND
+	
+	#include <openssl/hmac.h>
+	#include "hkdf.h"
+
+	#define _IMPL_CRYPTO_SHA256_HKDF_EXPAND		_ossl_sha256_hkdf_expand
+
+	cstatus_t _ossl_hkdf_update(void* ctx, const cspan_t* data)
+	{
+		DEBUG_ASSERT(ctx != NULL)
+
+		_overflow_check(data->size)
+
+		_OSSL_FAIL(EVP_DigestUpdate((EVP_MD_CTX*)ctx, data->data, data->size))
+		
+		return CSTATUS_OK;
+	}
+
+	cstatus_t _ossl_hkdf_finish(void* ctx, sha256_t hmacOut32)
+	{
+		unsigned int hmacSize;
+
+		DEBUG_ASSERT(ctx != NULL)
+
+		hmacSize = sizeof(sha256_t);
+
+		_OSSL_FAIL(EVP_DigestFinal_ex((EVP_MD_CTX*)ctx, hmacOut32, &hmacSize))
+
+		/* When configured for sha256, should always be the same size in/out */
+		DEBUG_ASSERT(hmacSize == sizeof(sha256_t))
+		
+		return CSTATUS_OK;
+	}
+
+	_IMPLSTB cstatus_t _ossl_sha256_hkdf_expand(const cspan_t* prk, const cspan_t* info, span_t* okm)
+	{
+		EVP_MD_CTX* ctx;
+		cstatus_t result;
+		struct nc_hkdf_fn_cb_struct handler;
+	
+		/*
+		* NOTE! Hmac reusable flag must be set to allow for multiple
+		* calls to the finish function without losing the context.
+		*/
+
+		if ((ctx = EVP_MD_CTX_create()) == NULL)
+		{
+			return CSTATUS_FAIL;
+		}
+
+		_OSSL_FAIL(EVP_DigestInit_ex2(ctx, EVP_sha256(), NULL))
+
+		_OSSL_FAIL(EVP_DigestUpdate(ctx, prk->data, prk->size));
+		
+		handler.update = _ossl_hkdf_update;
+		handler.finish = _ossl_hkdf_finish;
+
+		result = hkdfExpandProcess(&handler, ctx, info, okm);
+
+		EVP_MD_CTX_destroy(ctx);
+
+		return result;
+	}
+
+#endif /* !_IMPL_CRYPTO_SHA256_HKDF_EXPAND */
+
+#endif	/*!OPENSSL_CRYPTO_LIB */
\ No newline at end of file