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, 570 insertions, 0 deletions

diff --git a/include/noscrypt.h b/include/noscrypt.h
new file mode 100644
index 0000000..4d03b8d
--- /dev/null
+++ b/include/noscrypt.h
@@ -0,0 +1,570 @@
+/*
+* Copyright (c) 2024 Vaughn Nugent
+*
+* Package: noscrypt
+* File: noscrypt.h
+*
+* 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/.
+*/
+
+/*
+* noscrypt is a an open-source, strict C89 library that performs the basic 
+* cryptographic operations found in the Nostr protocol. It is designed to be
+* portable and easy to use in any C89 compatible environment. It is also designed
+*/
+
+#pragma once
+
+#ifndef NOSCRYPT_H
+#define NOSCRYPT_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include "platform.h"
+
+/* Set api export calling convention (allow used to override) */
+#ifndef NC_CC
+	#ifdef _NC_IS_WINDOWS
+		/* STD for importing to other languages such as .NET */
+		#define NC_CC __stdcall
+	#else
+		#define NC_CC 
+	#endif
+#endif /*  !NC_CC */
+
+#ifndef NC_EXPORT	/* Allow users to disable the export/impoty macro if using source code directly */
+	#ifdef NOSCRYPT_EXPORTING
+		#ifdef _NC_IS_WINDOWS
+			#define NC_EXPORT __declspec(dllexport)
+		#else
+			#define NC_EXPORT __attribute__((visibility("default")))
+		#endif /*  _NC_IS_WINDOWS */
+	#else
+		#ifdef _NC_IS_WINDOWS
+			#define NC_EXPORT __declspec(dllimport)
+		#else
+			#define NC_EXPORT
+		#endif /*  _NC_IS_WINDOWS */
+	#endif /*  !NOSCRYPT_EXPORTING */
+#endif /*  !NC_EXPORT */
+
+/*
+* CONSTANTS
+*/
+#define BIP340_PUBKEY_HEADER_BYTE		0x02
+#define NIP44_MESSAGE_KEY_SIZE			0x4c	/*32 + 12 + 32 = 76 */
+#define NC_ENCRYPTION_NONCE_SIZE		0x20
+#define NC_SEC_KEY_SIZE					0x20
+#define NC_PUBKEY_SIZE					0x20
+#define NC_CONTEXT_ENTROPY_SIZE			0x20
+#define NC_SHARED_SEC_SIZE				0x20
+#define NC_CONV_KEY_SIZE				0x20
+#define NC_HMAC_KEY_SIZE				0x20
+#define NC_ENCRYPTION_MAC_SIZE			0x20
+#define NC_MESSAGE_KEY_SIZE NIP44_MESSAGE_KEY_SIZE
+
+/*
+* From spec
+* https://github.com/nostr-protocol/nips/blob/master/44.md#decryption
+*/
+#define NIP44_MIN_ENC_MESSAGE_SIZE		0x01
+#define NIP44_MAX_ENC_MESSAGE_SIZE		0xffff
+
+#define NC_ENC_VERSION_NIP04			0x04
+#define NC_ENC_VERSION_NIP44			0x2c
+
+/*
+*	ERROR CODES
+* 
+* Error codes are 64bit integers. The lower 8 bits are reserved for 
+* the error code, and the upper 8 bits are reserved for the argument 
+* position.
+* 
+* NCResult type is 64bit to also allow for positive return values for
+* operations that return a value count.
+*/
+
+#define NC_ARG_POSITION_OFFSET		0x08
+#define NC_ERROR_CODE_MASK			0xFF
+
+#define NC_SUCCESS					0x00
+#define E_NULL_PTR					-1
+#define E_INVALID_ARG				-2
+#define E_INVALID_CONTEXT			-3
+#define E_ARGUMENT_OUT_OF_RANGE		-4
+#define E_OPERATION_FAILED			-5
+#define E_VERSION_NOT_SUPPORTED		-6
+
+
+/* A compressed resul/return value, negative values 
+are failure, 0 is success and positive values are 
+defined by the operation. 
+*/
+typedef int64_t NCResult;
+
+/*
+ An secp256k1 secret key (aka private key buffer)
+*/
+typedef struct secret_key_struct {
+
+	uint8_t key[NC_SEC_KEY_SIZE];
+
+} NCSecretKey;
+
+/*
+  An x-only secp256k1 public key
+*/
+typedef struct xonly_pubkey_struct {
+
+	uint8_t key[NC_PUBKEY_SIZE];
+
+} NCPublicKey;
+
+/*
+	An opaque full library context object
+*/
+typedef struct ctx_struct {
+
+	void* secpCtx;
+
+} NCContext;
+
+/*
+* The encryption arguments structure. This structure is used to pass 
+arguments to the encryption and decryption functions. It stores the
+data buffers and required nonce used for the stream cipher.
+*/
+typedef struct nc_encryption_struct {
+
+	/* The nonce used for the stream cipher. */
+	const uint8_t* nonce32;
+
+	/* Writes the hmac key to the buffer during encryption events.
+	Set to NULL on decryption */
+	uint8_t* hmacKeyOut32;
+
+	/* The input data buffer to encrypt/decrypt */
+	const uint8_t* inputData;
+
+	/* The output data buffer to write data to */
+	uint8_t* outputData;
+
+	/* The size of the data buffers. Buffers must 
+	* be the same size or larger than this value
+	*/
+	uint32_t dataSize;
+
+	/* The version of the encryption standard to use */
+	uint32_t version;
+
+} NCEncryptionArgs;
+
+/*
+* A structure for Nip44 message authentication code verification. This structure
+* is used to pass arguments to the NCVerifyMac and NCVerifyMacEx functions. 
+*/
+typedef struct nc_mac_verify {
+
+	/* The message authentication code certifying the Nip44 payload */
+	const uint8_t* mac32;
+
+	/* The nonce used for the original message encryption */
+	const uint8_t* nonce32;
+
+	/* The message payload data */
+	const uint8_t* payload;
+
+	/* The size of the payload data */
+	uint32_t payloadSize;
+
+} NCMacVerifyArgs;
+
+
+/*
+	API FUNCTIONS
+*/
+
+/*
+* A helper function to cast a buffer to a NCSecretKey struct
+* @param key The buffer to cast
+* @return A pointer to the NCSecretKey struct
+*/
+static _nc_fn_inline NCSecretKey* NCToSecKey(uint8_t key[NC_SEC_KEY_SIZE])
+{
+	return (NCSecretKey*)key;
+}
+
+/*
+* A helper function to cast a buffer to a NCPublicKey struct
+* @param key The buffer to cast
+* @return A pointer to the NCPublicKey struct
+*/
+static _nc_fn_inline NCPublicKey* NCToPubKey(uint8_t key[NC_PUBKEY_SIZE])
+{
+	return (NCPublicKey*)key;
+}
+
+static _nc_fn_inline NCResult NCResultWithArgPosition(NCResult err, uint8_t argPosition)
+{
+	return -(((NCResult)argPosition << NC_ARG_POSITION_OFFSET) | -err);
+}
+
+/*
+* Parses an error code and returns the error code and the argument position 
+that caused the error.
+* @param result The error code to parse
+* @param argPositionOut A pointer to the argument position to write to
+* @return The error code
+*/
+static _nc_fn_inline int NCParseErrorCode(NCResult result, uint8_t* argPositionOut)
+{
+	NCResult asPositive;
+	int code;
+
+	/* convert result to a positive value*/
+	asPositive = -result;
+
+	/* Get the error code from the lower 8 bits and the argument position from the upper 8 bits*/
+	code = -(asPositive & NC_ERROR_CODE_MASK);
+	*argPositionOut = (asPositive >> NC_ARG_POSITION_OFFSET) & 0xFF;
+
+	return code;
+}
+
+/*--------------------------------------
+*		LIB CONTEXT API
+*/
+
+/*
+* Runtime check for the size of the context struct to allow 
+for dynamic allocation when context size structure is not known. 
+* @return The size of the context struct in bytes
+*/
+NC_EXPORT uint32_t NC_CC NCGetContextStructSize(void);
+/*
+* Initializes a context struct with the given entropy
+* @param ctx A pointer to the context structure to initialize
+* @param entropy The entropy to initialize the context with
+* @return NC_SUCCESS if the operation was successful, otherwise an error code
+*/
+NC_EXPORT NCResult NC_CC NCInitContext(
+	NCContext* ctx, 
+	const uint8_t entropy[NC_CONTEXT_ENTROPY_SIZE]
+);
+/*
+* Reinitializes a context struct with the given 
+* @param ctx A pointer to the context structure to initialize
+* @param entropy The entropy to initialize the context with
+* @return NC_SUCCESS if the operation was successful, otherwise an error code
+*/
+NC_EXPORT NCResult NC_CC NCReInitContext(
+	NCContext* ctx, 
+	const uint8_t entropy[NC_CONTEXT_ENTROPY_SIZE]
+);
+
+/*
+* Destroys a context struct
+* @param ctx A pointer to the existing context structure to destroy
+* @return NC_SUCCESS if the operation was successful, otherwise an error code
+*/
+NC_EXPORT NCResult NC_CC NCDestroyContext(NCContext* ctx);
+
+
+
+/*--------------------------------------
+*		HIGH LEVEL SIGNING API
+*/
+
+/*
+* Gets a x-only compressed public key from the given secret key
+* @param ctx A pointer to the existing library context
+* @param sk A pointer to the secret key
+* @param pk A pointer to the compressed public key buffer to write to
+* @return NC_SUCCESS if the operation was successful, otherwise an error code
+*/
+NC_EXPORT NCResult NC_CC NCGetPublicKey(
+	const NCContext* ctx, 
+	const NCSecretKey* sk, 
+	NCPublicKey* pk
+);
+/*
+* Validates that a given secret key is valid according to the secp256k1 curve. This 
+is functionally the same as calling secp256k1_ec_seckey_verify. 
+* @param ctx A pointer to the existing library context
+* @param sk A pointer to the secret key to verify 
+* @return 1 if the secret key is valid, 0 if it is not, otherwise an error code
+*/
+NC_EXPORT NCResult NC_CC NCValidateSecretKey(
+	const NCContext* ctx, 
+	const NCSecretKey* sk
+);
+
+
+/*
+* Signs a raw message after computing the sha256 checksum using the
+given secret key and writes the signature to the sig64 buffer.
+* @param ctx A pointer to the existing library context
+* @param sk A pointer to the secret key to sign with
+* @param random32 A pointer to the random32 buffer to use for signing
+* @param data A pointer to the raw data buffer to sign
+* @param dataSize The size of the raw data buffer
+* @param sig64 A pointer to the 64-byte buffer to write the signature to
+* @return NC_SUCCESS if the operation was successful, otherwise an error code
+*/
+NC_EXPORT NCResult NC_CC NCSignData(
+	const NCContext* ctx,
+	const NCSecretKey* sk,
+	const uint8_t random32[32],
+	const uint8_t* data,
+	const uint32_t dataSize,
+	uint8_t sig64[64]
+);
+
+/*
+* Verifies a signature of a raw data buffer matches the output using the given public key.
+* @param ctx A pointer to the existing library context
+* @param sig64 The 64byte signature to verify
+* @param data A pointer to the raw data buffer to verify
+* @param dataSize The size of the raw data buffer
+* @param pk A pointer to the the x-only compressed public key (x-only serialized public key)
+* @return NC_SUCCESS if the signature could be verified, otherwise an error code
+*/
+NC_EXPORT NCResult NC_CC NCVerifyData(
+	const NCContext* ctx,
+	const NCPublicKey* pk,
+	const uint8_t* data,
+	const uint32_t dataSize,
+	const uint8_t sig64[64]
+);
+
+/*--------------------------------------
+*		EXTENDED SIGNING API
+*/
+
+/*
+* Signs a message using the given secret key and writes the signature to the sig64 buffer
+* @param ctx A pointer to the existing library context
+* @param sk A pointer to the secret key to sign with
+* @param random32 A pointer to the random32 buffer to use for signing
+* @param digest32 A pointer to sha256 digest32 to sign
+* @param sig64 A pointer to the 64-byte buffer to write the signature to
+* @return NC_SUCCESS if the operation was successful, otherwise an error code
+*/
+NC_EXPORT NCResult NC_CC NCSignDigest(
+	const NCContext* ctx,
+	const NCSecretKey* sk,
+	const uint8_t random32[32],
+	const uint8_t digest32[32],
+	uint8_t sig64[64]
+);
+
+/*
+* Verifies a signature of a digest32 matches the output using the given public key.
+Equivalent to calling secp256k1_schnorrsig_verify.
+* @param ctx A pointer to the existing library context
+* @param sig64 A pointer to the 64-byte signature to verify
+* @param digest32 A pointer to a 32-byte message digest to verify
+* @param pk A pointer to the the x-only compressed public key (x-only serialized public key)
+* @return NC_SUCCESS if the signature could be verified, otherwise an error code
+*/
+NC_EXPORT NCResult NC_CC NCVerifyDigest(
+	const NCContext* ctx,
+	const NCPublicKey* pk,
+	const uint8_t digest32[32],
+	const uint8_t sig64[64]
+);
+
+
+
+/*--------------------------------------
+*		HIGH LEVEL ENCRYPTION API
+*/
+
+/*
+*			NOTES
+* 
+*	NIP-44 requires that plaintext/ciphertext must be padded in powers of 2.
+*	Since this library operates on data at the binary level, and does not do 
+*	ANY runtime heap allocation, it is up to the user to ensure that the 
+*	plaintext/ciphertext buffers are padded properly in The NCryptoData struct
+*   before calling the encryption/decryption functions.
+*/
+
+/*
+* High level api for encrypting nostr messages using a secret key and a public key. Use
+the NCEncryptEx functions for extended encryption functionality
+* @param ctx The library context
+* @param sk The secret key (the local private key)
+* @param pk The compressed public key (x-only serialized public key) the other user's public key
+* @param args The encryption arguments
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+the error code and positional argument that caused the error
+*/
+NC_EXPORT NCResult NC_CC NCEncrypt(
+	const NCContext* ctx, 
+	const NCSecretKey* sk, 
+	const NCPublicKey* pk,
+	NCEncryptionArgs* args
+);
+
+/*
+* High level api for decrypting nostr messages using a secret key and a public key. Use
+the NCDecryptEx functions for extended decryption functionality.
+* @param ctx The library context
+* @param sk The secret key (the local private key)
+* @param pk The compressed public key (x-only serialized public key) the other user's public key
+* @param args The decryption arguments
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+the error code and positional argument that caused the error
+*/
+NC_EXPORT NCResult NC_CC NCDecrypt(
+	const NCContext* ctx, 
+	const NCSecretKey* sk, 
+	const NCPublicKey* pk, 
+	NCEncryptionArgs* args
+);
+
+/*
+* High level api for verifying a Nip44 message authentication code using a secret key 
+and a public key. Use the NCVerifyMacEx functions for extended verification functionality.
+* @param ctx A pointer to an existing library context
+* @param sk A pointer to the secret key
+* @param pk A pointer to the compressed public key (x-only serialized public key)
+* @param args A pointer to the mac verification arguments
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+* the error code and positional argument that caused the error
+*/
+NC_EXPORT NCResult NC_CC NCVerifyMac(
+	const NCContext* ctx,
+	const NCSecretKey* sk,
+	const NCPublicKey* pk,
+	NCMacVerifyArgs* args
+);
+
+/*--------------------------------------
+*		EXTENDED ENCRYPTION API
+*/
+
+/*
+* Computes a NIP-44 shared secret from a secret key and a public key and 
+stores it in the sharedPoint buffer.
+* @param ctx A pointer to the existing library context
+* @param sk The secret key
+* @param pk The compressed public key (x-only serialized public key)
+* @param sharedPoint The buffer to store write the secret data to
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+the error code and positional argument that caused the error
+*/
+NC_EXPORT NCResult NC_CC NCGetSharedSecret(
+	const NCContext* ctx, 
+	const NCSecretKey* sk, 
+	const NCPublicKey* pk, 
+	uint8_t sharedPoint[NC_SHARED_SEC_SIZE]
+);
+
+/*
+* Computes a NIP-44 conversation key from the local secret key and the remote 
+public key, and stores it in the conversationKey buffer.
+* @param ctx A pointer to the existing library context
+* @param sk A pointer to the the secret key
+* @param pk A pointer to the compressed public key (x-only serialized public key)
+* @param conversationKey The buffer to store write the conversation key to
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+the error code and positional argument that caused the error
+*/
+NC_EXPORT NCResult NC_CC NCGetConversationKey(
+	const NCContext* ctx, 
+	const NCSecretKey* sk, 
+	const NCPublicKey* pk, 
+	uint8_t conversationKey[NC_CONV_KEY_SIZE]
+);
+/*
+* Computes a NIP-44 conversation key a shared secret/point, and stores it in the 
+conversationKey buffer.
+* @param ctx A pointer to the existing library context
+* @param sharedPoint A pointer to the shared secret/point
+* @param conversationKey The buffer to store write the conversation key to
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+the error code and positional argument that caused the error
+*/
+NC_EXPORT NCResult NC_CC NCGetConversationKeyEx(
+	const NCContext* ctx, 
+	const uint8_t sharedPoint[NC_SHARED_SEC_SIZE], 
+	uint8_t conversationKey[NC_CONV_KEY_SIZE]
+);
+
+/*
+* Encrypts a message using the given conversation key and writes the encrypted message to the
+* output buffer. The output buffer must be at least 99 bytes in size.
+* @param ctx A pointer to the existing library context
+* @param conversationKey A pointer to the conversation key
+* @param args A pointer to the encryption arguments structure
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+the error code and positional argument that caused the error.
+*/
+NC_EXPORT NCResult NC_CC NCEncryptEx(
+	const NCContext* ctx, 
+	const uint8_t conversationKey[NC_CONV_KEY_SIZE],
+	NCEncryptionArgs* args
+);
+
+/*
+* Decrypts a message using the given conversation key and writes the decrypted message to the
+* output buffer. 
+* @param ctx A pointer to the existing library context
+* @param conversationKey A pointer to the conversation key
+* @param args A pointer to the decryption arguments structure
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+the error code and positional argument that caused the error.
+*/
+NC_EXPORT NCResult NC_CC NCDecryptEx(
+	const NCContext* ctx, 
+	const uint8_t conversationKey[NC_CONV_KEY_SIZE], 
+	NCEncryptionArgs* args
+);
+
+/*
+* Verifies a Nip44 message authentication code using the given conversation key.
+* @param ctx A pointer to the existing library context
+* @param conversationKey A pointer to the conversation key
+* @param args A pointer to the mac verification arguments
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+* the error code and positional argument that caused the error.
+*/
+NC_EXPORT NCResult NC_CC NCVerifyMacEx(
+	const NCContext* ctx,
+	const uint8_t conversationKey[NC_CONV_KEY_SIZE],
+	NCMacVerifyArgs* args
+);
+
+/*
+* Computes a message authentication code for a given payload using the given hmacKey and writes the
+* mac to the hmacOut buffer.
+* @param ctx A pointer to the existing library context
+* @param hmacKey A pointer to the hmac key
+* @param payload A pointer to the payload data buffer
+* @param payloadSize The size of the payload data buffer
+* @param hmacOut A pointer to the buffer to write the mac to
+* @return NC_SUCCESS if the operation was successful, otherwise an error code. Use NCParseErrorCode to
+* the error code and positional argument that caused the error.
+*/
+NC_EXPORT NCResult NCComputeMac(
+	const NCContext* ctx,
+	const uint8_t hmacKey[NC_HMAC_KEY_SIZE],
+	const uint8_t* payload,
+	uint32_t payloadSize,
+	uint8_t hmacOut[NC_ENCRYPTION_MAC_SIZE]
+);
+
+#endif /* !NOSCRYPT_H */