Squashed commit of the following:

commit ec7461dc3425b963b0768210a5f51d8eab770c86
Author: vnugent <public@vaughnnugent.com>
Date:   Wed Aug 7 21:36:26 2024 -0400

    update changelog

commit f58245b0d249fc162feacc610eedf81656a481a3
Author: vnugent <public@vaughnnugent.com>
Date:   Wed Aug 7 21:14:53 2024 -0400

    feat: Add cipher mode mask and fix cc

commit 7c8f910e5be9a1d86af5bdcb7e51e8092cc06cf6
Author: vnugent <public@vaughnnugent.com>
Date:   Wed Aug 7 15:11:19 2024 -0400

    feat:   added NCEncryptionGetIvSize() function and helpers

commit 4d76151802b4cc04fb89d47c35c2d876b395f1a4
Merge: 942aed8 6fdc4bc
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Aug 6 20:56:55 2024 -0400

    Merge branch 'master' into develop

commit 942aed8a4e7c173a2c9423829c2b38087cbd49e4
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Aug 6 20:54:03 2024 -0400

    chore: update changelog and mbedtls headers

commit 3b97f84fd0477eafcd6567eb8597b213e4136664
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Aug 6 19:57:10 2024 -0400

    update libsecp256k1 to v0.5.1

commit 7989a2660997b909e0b99fc1dfb3bcfbb0528df3
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Aug 6 19:42:25 2024 -0400

    update openssl to 3.3.1

commit e949ae5aa1fd25d4d11fe31e30b7d82ae7778dc2
Author: vnugent <public@vaughnnugent.com>
Date:   Mon Aug 5 18:01:03 2024 -0400

    fix: Find and fix openssl encryption bug

commit a60a3e1ca1d99d655c0cfc96e3952c371e8a8677
Author: vnugent <public@vaughnnugent.com>
Date:   Sun Aug 4 15:27:06 2024 -0400

    cleanup comments + return codes

commit 2aa7f4b6cdb2e0e8990e7177476f4104fd2e2b17
Author: vnugent <public@vaughnnugent.com>
Date:   Sat Jul 27 22:20:53 2024 -0400

    fix codeberg url

commit 1640f79776c6b291b49a39a6128c05888fc4153e
Author: vnugent <public@vaughnnugent.com>
Date:   Sat Jul 27 00:05:07 2024 -0400

    fix: Potential overflow in nip44 padding calculation

commit 07de078a3b5b7b0043d9f81bb5a9e750a3a0c7c1
Author: vnugent <public@vaughnnugent.com>
Date:   Fri Jul 26 23:37:15 2024 -0400

    refactor: Span invasion, checks and fix some evp api

commit 54f520e4bfc0fe23e2719d44b09739aa8709451c
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Jul 23 19:55:13 2024 -0400

    latest changes

commit 12feb33dba2061415d6f39fa59dec16fafcda2a0
Author: vnugent <public@vaughnnugent.com>
Date:   Sun Jul 21 17:51:04 2024 -0400

    Push latest changes, patches, and internal upgrades

commit ffe42b6858f112a00405be4f0605ab1163063749
Author: vnugent <public@vaughnnugent.com>
Date:   Sat Jul 13 22:13:13 2024 -0400

    test: Add decryption test cases and fixes

commit 5dfafbc5a9214587533ec8b1dae2a962118d3650
Author: vnugent <public@vaughnnugent.com>
Date:   Fri Jul 12 22:14:00 2024 -0400

    feat: add decryption functionality to public api

commit 8df8c5aed4ac626171b451b5422c3b207e88000b
Author: vnugent <public@vaughnnugent.com>
Date:   Thu Jul 11 21:39:39 2024 -0400

    feat: Update sidecar utils library

commit 23fe6e8c8596333c2183f0f4389817087442c551
Author: vnugent <public@vaughnnugent.com>
Date:   Fri Jul 5 00:03:48 2024 -0400

    push latest utils and changes

commit dc71f861df8929deee300368b88ef47d45560695
Author: vnugent <public@vaughnnugent.com>
Date:   Mon Jul 1 15:05:34 2024 -0400

    fix: #7 fix confusing inline functions

commit 90166048046d2511f0bb74f8880180e82466d4c0
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Jun 18 21:22:37 2024 -0400

    push pending changes

commit 461dd71069d0c0250752ac1256160605c33a6243
Author: vnugent <public@vaughnnugent.com>
Date:   Tue Jun 11 15:44:28 2024 -0400

    feat!: #4 Close #4. Add public nip04 support to api

commit a74f96251bcc81fb2c94fe75dd6f8043fd35fe0b
Merge: 1c26ef8 51d0aff
Author: vnugent <public@vaughnnugent.com>
Date:   Wed May 29 13:37:00 2024 -0400

    Merge branch 'master' into develop

commit 1c26ef86a04690120f4f752c7c5018a570ec5880
Author: vnugent <public@vaughnnugent.com>
Date:   Wed May 29 13:34:20 2024 -0400

    missed extra argument

commit 88c9095743a12cf8fc1793c607ba3a1e4fa86483
Author: vnugent <public@vaughnnugent.com>
Date:   Wed May 29 13:25:51 2024 -0400

    refactor!: return NC_SUCCESS when validating secret key

commit 718be80a4810b9352de7eb0707da54020aa6b649
Author: vnugent <public@vaughnnugent.com>
Date:   Mon May 27 14:52:41 2024 -0400

    fix: Properly build mbedtls & cmake fixes

commit a8a6efb2319f739e5faae550561dc27d9dd1e88d
Author: vnugent <public@vaughnnugent.com>
Date:   Sun May 26 17:39:40 2024 -0400

    chore: Update libs, reorder files, internalize private headers

commit 72e1b7be4031e2fd4d258fcf434ad049c0029201
Author: vnugent <public@vaughnnugent.com>
Date:   Sun May 26 13:39:08 2024 -0400

    fix: Add c++ extern prototypes in noscrypt.h

commit aeaac8d328b75911541be64d6f09d58fca294a08
Author: vnugent <public@vaughnnugent.com>
Date:   Sun May 26 11:47:17 2024 -0400

    refactor: Dep update, openssl chacha20 added

commit 86b02540cce6015cfe4a2a56499a9a2f45d4e368
Author: vnugent <public@vaughnnugent.com>
Date:   Sat May 18 12:24:17 2024 -0400

    refactor: Remove NCContext structure definition

commit d09d9330415d463ca19be9394b02ce11b3366f7e
Author: vnugent <public@vaughnnugent.com>
Date:   Mon May 13 22:33:50 2024 -0400

    fix: update mbedtls inline issue includes

commit 7838cb4bb15d4f453f92f56ece75e2b03986fe42
Author: vnugent <public@vaughnnugent.com>
Date:   Mon May 13 22:29:16 2024 -0400

    fix: force fPIC for secp256k1 targets

commit d76f7708bc6ae81a638ca708230ac9153ac754e2
Merge: aa8033d a526139
Author: vnugent <public@vaughnnugent.com>
Date:   Sun May 12 00:37:01 2024 -0400

    Merge branch 'master' into develop

commit aa8033d4dbfebeb72b6fd7a0cd218ebde0eb54dd
Author: vnugent <public@vaughnnugent.com>
Date:   Sun May 12 00:34:20 2024 -0400

    Final overview and test before tag

commit 4e3ead2cf1d3068e77f0959dfdc17e20e9102a0f
Merge: 2cee801 872c49d
Author: vnugent <public@vaughnnugent.com>
Date:   Mon May 6 22:08:09 2024 -0400

    Merge branch 'master' into develop

commit 2cee801979bfbcb3b0e53f592ce8c779b57cb679
Author: vnugent <public@vaughnnugent.com>
Date:   Mon May 6 22:02:39 2024 -0400

    Ensure static and dynamic libs get same args

commit f533694023133552d0d42933d779c95a5854343f
Author: vnugent <public@vaughnnugent.com>
Date:   Mon May 6 21:50:29 2024 -0400

    feat: CMake install & fetch-content test & updates

commit 940ff20348b13d0bc30d9e9f4289dd6de20b16ba
Author: vnugent <public@vaughnnugent.com>
Date:   Sun May 5 14:07:28 2024 -0400

    codeberg readonly push

commit b34ed055c0b7d143561ce8798e0a95313b9224bd
Merge: 0a40e20 e737556
Author: vnugent <public@vaughnnugent.com>
Date:   Sat May 4 14:06:45 2024 -0400

    Merge branch 'master' into develop

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

6 files changed, 165 insertions, 100 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 375d11c..38f1c09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,10 +14,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Utilities for padding calculations
 - Prints the name of the configured crypto backend during build
 - Many internal hardening improvments (span pass-by-value, span validation functions)
+- `NCEncryptionGetIvSize()` function to determine the size of the IV for a chosen encryption spec (nip04 or nip44)
 
 ### Fixed
 - OpenSSL EVP incorrect cipher initialization vector
 - OpenSSL HKDF incorrect key derivation when switching to EVP api
+- Some missing calling convention macros for public api functions
 
 ### Changed
 - Updated libsecp256k1 to v0.5.1
@@ -27,6 +29,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added helper functions to alter the `NCEncryptionArgs` api. Altering fields directly is now deprecated.
 - Public API visibility for non-Windows platforms now defaults to `extern`
 - **Breaking:** Changed the `nonce32` and `hmacKeyOut32` properties of the `NCEncryptionArgs` struct to `nonceData` and `keyData` respectively. ABI is still compatible, but API has changed. Again mutating this structure manually is now deprecated.
+- Unified some API naming conventions for better consistency
+
+### Removed
+- `NC_ENCRYPTION_NONCE_SIZE` macro for better forward compatability
+- `NC_NIP04_AES_IV_SIZE` macro for better forward compatability 
 
 ## [0.1.2] - 2024-05-29
 
diff --git a/include/noscrypt.h b/include/noscrypt.h
index faad1f1..574cef9 100644
--- a/include/noscrypt.h
+++ b/include/noscrypt.h
@@ -68,7 +68,6 @@ extern "C" {
 */
 #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
@@ -77,8 +76,9 @@ extern "C" {
 #define NC_HMAC_KEY_SIZE				0x20
 #define NC_ENCRYPTION_MAC_SIZE			0x20
 #define NC_MESSAGE_KEY_SIZE				NIP44_MESSAGE_KEY_SIZE
-#define NC_NIP04_AES_IV_SIZE			0x10	/* AES IV size is 16 bytes (aka cipher block size) */
 #define NC_NIP04_AES_KEY_SIZE			0x20	/* AES 256 key size */
+#define NC_NIP44_IV_SIZE				0x20	/* 32 bytes */
+#define NC_NIP04_IV_SIZE				0x10	/* 16 bytes */
 
 /*
 * From spec
@@ -121,10 +121,9 @@ extern "C" {
 */
 
 #define NC_ENC_SET_VERSION			0x01
-#define NC_ENC_SET_NIP44_NONCE		0x02
+#define NC_ENC_SET_IV				0x02
 #define NC_ENC_SET_NIP44_MAC_KEY	0x03
 #define NC_ENC_SET_NIP04_KEY		0x04
-#define NC_ENC_SET_NIP04_IV			0x05
 
 
 /* A compressed resul/return value, negative values 
@@ -578,7 +577,7 @@ NC_EXPORT NCResult NCComputeMac(
 * @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 NCSetEncryptionProperty(
+NC_EXPORT NCResult NCEncryptionSetProperty(
 	NCEncryptionArgs* args, 
 	uint32_t property,
 	uint32_t value
@@ -595,7 +594,7 @@ NC_EXPORT NCResult NCSetEncryptionProperty(
 * @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 NCSetEncryptionPropertyEx(
+NC_EXPORT NCResult NCEncryptionSetPropertyEx(
 	NCEncryptionArgs* args,
 	uint32_t property,
 	uint8_t* value,
@@ -612,13 +611,20 @@ NC_EXPORT NCResult NCSetEncryptionPropertyEx(
 * @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 NCSetEncryptionData(
+NC_EXPORT NCResult NCEncryptionSetData(
 	NCEncryptionArgs* args,
 	const uint8_t* input,
 	uint8_t* output,
 	uint32_t dataSize
 );
 
+/*
+* Gets the size of the encryption nonce (iv) for the given encryption version
+* @param version The encryption version to get the nonce size for
+* @return The size of the nonce in bytes, or 0 if the version is not supported
+*/
+NC_EXPORT uint32_t NCEncryptionGetIvSize(uint32_t version);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/include/noscryptutil.h b/include/noscryptutil.h
index bd60c79..63e08f8 100644
--- a/include/noscryptutil.h
+++ b/include/noscryptutil.h
@@ -43,6 +43,8 @@ extern "C" {
 #define E_CIPHER_BAD_INPUT				-15
 #define E_CIPHER_BAD_INPUT_SIZE			-16
 
+#define NC_UTIL_CIPHER_MODE				0x01u
+
 #define NC_UTIL_CIPHER_MODE_ENCRYPT		0x00u
 #define NC_UTIL_CIPHER_MODE_DECRYPT		0x01u
 #define NC_UTIL_CIPHER_ZERO_ON_FREE		0x02u
@@ -132,7 +134,7 @@ NC_EXPORT NCResult NC_CC NCUtilCipherReadOutput(
 );
 
 /*
-* Sets a property on the encryption context. Equivalent to calling NCSetEncryptionPropertyEx
+* Sets a property on the encryption context. Equivalent to calling NCEncryptionSetPropertyEx
 * @param ctx A valid pointer to an encryption context
 * @param property The property to set
 * @param value A pointer to the value to set
@@ -176,6 +178,15 @@ NC_EXPORT NCResult NC_CC NCUtilCipherUpdate(
 	const NCPublicKey* pk
 );
 
+/*
+* Gets the size of the IV(nonce) required for the encryption context.
+* @param encCtx A valid pointer to an initialized encryption context
+* @return The size of the IV in bytes, or a negative error code if the context 
+* is invalid, or the version is not supported. Use NCParseErrorCode to get the error code
+* and positional argument that caused the error.
+*/
+NC_EXPORT NCResult NC_CC NCUtilCipherGetIvSize(const NCUtilCipherContext* encCtx);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/noscrypt.c b/src/noscrypt.c
index deadca6..fededaf 100644
--- a/src/noscrypt.c
+++ b/src/noscrypt.c
@@ -310,7 +310,7 @@ static _nc_fn_inline NCResult _encryptNip44Ex(
 
 	result = NC_SUCCESS;
 
-	ncSpanInitC(&nonceSpan, args->nonceData, NC_ENCRYPTION_NONCE_SIZE);
+	ncSpanInitC(&nonceSpan, args->nonceData, NC_NIP44_IV_SIZE);
 	
 	/* Message key will be derrived on every encryption call */
 	if (_getMessageKey(ck, nonceSpan, &messageKey) != CSTATUS_OK)
@@ -344,13 +344,14 @@ static _nc_fn_inline NCResult _decryptNip44Ex(const NCContext* ctx, const struct
 	struct message_key messageKey;
 	const struct nc_expand_keys* cipherKeys;
 
-	DEBUG_ASSERT2(ctx != NULL, "Expected valid context")
-	DEBUG_ASSERT2(ck != NULL, "Expected valid conversation key")
-	DEBUG_ASSERT2(args != NULL, "Expected valid encryption args")
+	DEBUG_ASSERT2(ctx != NULL, "Expected valid context");
+	DEBUG_ASSERT2(ck != NULL, "Expected valid conversation key");
+	DEBUG_ASSERT2(args != NULL, "Expected valid encryption args");
+	DEBUG_ASSERT(args->version == NC_ENC_VERSION_NIP44);
 
 	result = NC_SUCCESS;
 
-	ncSpanInitC(&nonceSpan, args->nonceData, NC_ENCRYPTION_NONCE_SIZE);
+	ncSpanInitC(&nonceSpan, args->nonceData, NC_NIP44_IV_SIZE);
 	
 	if (_getMessageKey(ck, nonceSpan, &messageKey) != CSTATUS_OK)
 	{
@@ -401,7 +402,7 @@ static NCResult _verifyMacEx(
 	DEBUG_ASSERT2(conversationKey != NULL, "Expected valid conversation key")
 	DEBUG_ASSERT2(args != NULL, "Expected valid mac verification args")
 
-	ncSpanInitC(&nonceSpan, args->nonce32, NC_ENCRYPTION_NONCE_SIZE);
+	ncSpanInitC(&nonceSpan, args->nonce32, NC_NIP44_IV_SIZE);
 	ncSpanInitC(&payloadSpan, args->payload, args->payloadSize);
 
 	/*
@@ -979,7 +980,7 @@ Cleanup:
 	return result;
 }
 
-NC_EXPORT NCResult NCComputeMac(
+NC_EXPORT NCResult NC_CC NCComputeMac(
 	const NCContext* ctx,
 	const uint8_t hmacKey[NC_HMAC_KEY_SIZE],
 	const uint8_t* payload,
@@ -1069,13 +1070,14 @@ Cleanup:
 
 #define ENSURE_ENC_MODE(args, mode) if(args->version != mode) return E_VERSION_NOT_SUPPORTED;
 
-NC_EXPORT NCResult NCSetEncryptionPropertyEx(
+NC_EXPORT NCResult NC_CC NCEncryptionSetPropertyEx(
 	NCEncryptionArgs* args,
 	uint32_t property,
 	uint8_t* value,
 	uint32_t valueLen
 )
 {
+	uint32_t ivSize;
 
 	CHECK_NULL_ARG(args, 0)
 	CHECK_NULL_ARG(value, 2)
@@ -1091,22 +1093,6 @@ NC_EXPORT NCResult NCSetEncryptionPropertyEx(
 
 		return NC_SUCCESS;
 
-	case NC_ENC_SET_NIP04_IV:
-		/*
-		* The safest way to store the nip04 IV is in the nonce
-		* field. An IV is essentially a nonce. A secure random
-		* number used to encrypt the first block of a CBC chain.
-		*/
-
-		CHECK_ARG_RANGE(valueLen, AES_IV_SIZE, UINT32_MAX, 3)
-
-		ENSURE_ENC_MODE(args, NC_ENC_VERSION_NIP04)
-
-		args->nonceData = value;
-
-		return NC_SUCCESS;
-
-
 	case NC_ENC_SET_NIP04_KEY:
 		/*
 		* The AES key is stored in the hmac key field, since
@@ -1122,13 +1108,17 @@ NC_EXPORT NCResult NCSetEncryptionPropertyEx(
 
 		return NC_SUCCESS;
 
-	case NC_ENC_SET_NIP44_NONCE:
+	case NC_ENC_SET_IV:
+		
+		ivSize = NCEncryptionGetIvSize(args->version);
 
-		/* Nonce buffer must be at least the size, max doesnt matter */
-		CHECK_ARG_RANGE(valueLen, NC_ENCRYPTION_NONCE_SIZE, UINT32_MAX, 3)
+		/* Gaurd invalid version */
+		if (ivSize == 0)
+		{
+			return E_VERSION_NOT_SUPPORTED;
+		}
 
-		/* Nonce is only used in nip44 mode */
-		ENSURE_ENC_MODE(args, NC_ENC_VERSION_NIP44)
+		CHECK_ARG_RANGE(valueLen, ivSize, ivSize, 3)
 
 		args->nonceData = value;
 
@@ -1155,13 +1145,13 @@ NC_EXPORT NCResult NCSetEncryptionPropertyEx(
 	return E_INVALID_ARG;
 }
 
-NC_EXPORT NCResult NCSetEncryptionProperty(
+NC_EXPORT NCResult NC_CC NCEncryptionSetProperty(
 	NCEncryptionArgs* args,
 	uint32_t property,
 	uint32_t value
 )
 {
-	return NCSetEncryptionPropertyEx(
+	return NCEncryptionSetPropertyEx(
 		args, 
 		property, 
 		(uint8_t*)&value, 
@@ -1169,7 +1159,7 @@ NC_EXPORT NCResult NCSetEncryptionProperty(
 	);
 }
 
-NC_EXPORT NCResult NCSetEncryptionData(
+NC_EXPORT NCResult NC_CC NCEncryptionSetData(
 	NCEncryptionArgs* args,
 	const uint8_t* input,
 	uint8_t* output,
@@ -1186,4 +1176,19 @@ NC_EXPORT NCResult NCSetEncryptionData(
 	args->dataSize = dataSize;
 
 	return NC_SUCCESS;	
-}
\ No newline at end of file
+}
+
+NC_EXPORT uint32_t NC_CC NCEncryptionGetIvSize(uint32_t version)
+{
+	switch (version)
+	{
+	case NC_ENC_VERSION_NIP04:
+		return NC_NIP04_IV_SIZE;
+
+	case NC_ENC_VERSION_NIP44:
+		return NC_NIP44_IV_SIZE;
+
+	default:
+		return 0;
+	}
+}
diff --git a/src/noscryptutil.c b/src/noscryptutil.c
index 4cee2c3..89e0f35 100644
--- a/src/noscryptutil.c
+++ b/src/noscryptutil.c
@@ -37,6 +37,7 @@
 #define MIN_PADDING_SIZE		0x20u
 #define NIP44_VERSION_SIZE		0x01u
 #define NIP44_PT_LEN_SIZE		sizeof(uint16_t)
+#define NIP44_NONCE_SIZE		NC_NIP44_IV_SIZE
 
 /*
 * minimum size for a valid nip44 payload
@@ -200,7 +201,7 @@ static _nc_fn_inline uint32_t _calcNip44TotalOutSize(uint32_t inputSize)
 
 	bufferSize = NIP44_VERSION_SIZE;
 
-	bufferSize += NC_ENCRYPTION_NONCE_SIZE;
+	bufferSize += NIP44_NONCE_SIZE;
 
 	bufferSize += NIP44_PT_LEN_SIZE;
 
@@ -267,7 +268,7 @@ static _nc_fn_inline int _nip44ParseSegments(
 	*nonce = ncSpanSliceC(
 		payload,
 		NIP44_VERSION_SIZE,
-		NC_ENCRYPTION_NONCE_SIZE
+		NIP44_NONCE_SIZE
 	);
 
 	/*
@@ -293,8 +294,8 @@ static _nc_fn_inline int _nip44ParseSegments(
 	*/
 	*cipherText = ncSpanSliceC(
 		payload,
-		NIP44_VERSION_SIZE + NC_ENCRYPTION_NONCE_SIZE,
-		payload.size - (NIP44_VERSION_SIZE + NC_ENCRYPTION_NONCE_SIZE + NC_ENCRYPTION_MAC_SIZE)
+		NIP44_VERSION_SIZE + NIP44_NONCE_SIZE,
+		payload.size - (NIP44_VERSION_SIZE + NIP44_NONCE_SIZE + NC_ENCRYPTION_MAC_SIZE)
 	);
 
 	return 1;
@@ -357,12 +358,23 @@ static NCResult _nip44EncryptCompleteCore(
 
 	ZERO_FILL(hmacKeyOut, sizeof(hmacKeyOut));
 
+	/* Get the nonce/iv size so we know how much nonce data to write */
+	result = NCUtilCipherGetIvSize(state);
+	DEBUG_ASSERT(result > 0);
+
 	/* Start by appending the version number */
 	ncSpanAppend(message, &outPos, Nip44VersionValue, sizeof(Nip44VersionValue));
 
 	/* next is nonce data */
-	ncSpanAppend(message, &outPos, encArgs.nonceData, NC_ENCRYPTION_NONCE_SIZE);
-	DEBUG_ASSERT(outPos == 1 + NC_ENCRYPTION_NONCE_SIZE);
+	ncSpanAppend(message, &outPos, encArgs.nonceData, (uint32_t)result);
+
+	/* 
+	* Assert the output points to the end of the nonce segment 
+	* for nip44 this is exactly 33 bytes. This assert also doubles
+	* to check the output of NCUtilCipherGetIvSize() to ensure
+	* it's returning the correct size for nip44
+	*/
+	DEBUG_ASSERT(outPos == 1 + NIP44_NONCE_SIZE);
 
 	/*
 	* Assign the hmac key from the stack buffer. Since the args structure
@@ -372,7 +384,7 @@ static NCResult _nip44EncryptCompleteCore(
 	* addresses.
 	*/
 
-	result = NCSetEncryptionPropertyEx(
+	result = NCEncryptionSetPropertyEx(
 		&encArgs,
 		NC_ENC_SET_NIP44_MAC_KEY,
 		hmacKeyOut,
@@ -397,7 +409,7 @@ static NCResult _nip44EncryptCompleteCore(
 	* plainText size field.
 	*/
 
-	result = NCSetEncryptionData(
+	result = NCEncryptionSetData(
 		&encArgs,
 		ncSpanGetOffset(message, outPos),	/* in place encryption */
 		ncSpanGetOffset(message, outPos),
@@ -517,7 +529,7 @@ static NCResult _nip44DecryptCompleteCore(
 	if ((state->_flags & NC_UTIL_CIPHER_MAC_NO_VERIFY) == 0)
 	{
 		DEBUG_ASSERT(ncSpanGetSizeC(macValue) == NC_ENCRYPTION_MAC_SIZE);
-		DEBUG_ASSERT(ncSpanGetSizeC(macData) > NC_ENCRYPTION_NONCE_SIZE + MIN_PADDING_SIZE);
+		DEBUG_ASSERT(ncSpanGetSizeC(macData) > NIP44_NONCE_SIZE + MIN_PADDING_SIZE);
 
 		/* Assign the mac data to the mac verify args */
 		macArgs.mac32 = ncSpanGetOffsetC(macValue, 0);
@@ -550,7 +562,7 @@ static NCResult _nip44DecryptCompleteCore(
 
 	DEBUG_ASSERT2(cipherText.size >= MIN_PADDING_SIZE, "Cipertext segment was parsed incorrectly. Too small");
 	
-	result = NCSetEncryptionData(
+	result = NCEncryptionSetData(
 		&encArgs,
 		ncSpanGetOffsetC(cipherText, 0),
 		ncSpanGetOffset(output, 0),			/*decrypt ciphertext and write directly to the output buffer */
@@ -653,6 +665,10 @@ NC_EXPORT NCUtilCipherContext* NC_CC NCUtilCipherAlloc(uint32_t encVersion, uint
 
 	if (encCtx != NULL)
 	{
+		/* 
+		* Technically I should be using the NCEncSetProperty but this 
+		* is an acceptable shortcut for now, may break in future 
+		*/
 		encCtx->encArgs.version = encVersion;
 		encCtx->_flags = flags;
 	}
@@ -694,7 +710,7 @@ NC_EXPORT NCResult NC_CC NCUtilCipherInit(
 	CHECK_NULL_ARG(encCtx, 0);
 	CHECK_NULL_ARG(inputData, 1);
 
-	if ((encCtx->_flags & NC_UTIL_CIPHER_MODE_DECRYPT) > 0)
+	if ((encCtx->_flags & NC_UTIL_CIPHER_MODE) == NC_UTIL_CIPHER_MODE_DECRYPT)
 	{
 		/*
 		* Validate the input data for proper format for 
@@ -842,7 +858,7 @@ NC_EXPORT NCResult NC_CC NCUtilCipherReadOutput(
 	return (NCResult)encCtx->buffer.actualOutput.size;
 }
 
-NC_EXPORT NCResult NCUtilCipherSetProperty(
+NC_EXPORT NCResult NC_CC NCUtilCipherSetProperty(
 	NCUtilCipherContext* ctx,
 	uint32_t property,
 	uint8_t* value,
@@ -852,7 +868,7 @@ NC_EXPORT NCResult NCUtilCipherSetProperty(
 	CHECK_NULL_ARG(ctx, 0)
 
 	/* All other arguments are verified */
-	return NCSetEncryptionPropertyEx(
+	return NCEncryptionSetPropertyEx(
 		&ctx->encArgs, 
 		property, 
 		value, 
@@ -889,7 +905,7 @@ NC_EXPORT NCResult NC_CC NCUtilCipherUpdate(
 	{
 	case NC_ENC_VERSION_NIP44:
 
-		if ((encCtx->_flags & NC_UTIL_CIPHER_MODE_DECRYPT) > 0)
+		if ((encCtx->_flags & NC_UTIL_CIPHER_MODE) == NC_UTIL_CIPHER_MODE_DECRYPT)
 		{
 			return _nip44DecryptCompleteCore(libContext, sk, pk, encCtx);
 		}
@@ -908,3 +924,16 @@ NC_EXPORT NCResult NC_CC NCUtilCipherUpdate(
 		return E_VERSION_NOT_SUPPORTED;
 	}
 }
+
+NC_EXPORT NCResult NC_CC NCUtilCipherGetIvSize(const NCUtilCipherContext* encCtx)
+{
+	uint32_t ivSize;
+
+	CHECK_NULL_ARG(encCtx, 0);
+
+	ivSize = NCEncryptionGetIvSize(encCtx->encArgs.version);
+
+	return ivSize == 0
+		? E_VERSION_NOT_SUPPORTED
+		: (NCResult)ivSize;
+}
diff --git a/tests/test.c b/tests/test.c
index b4cdef1..e8b064b 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -284,74 +284,78 @@ static int TestPublicApiArgumentValidation()
     NCSecretKey secKey;
     NCPublicKey pubKey;
     uint8_t hmacKeyOut[NC_HMAC_KEY_SIZE];
-    uint8_t nonce[NC_ENCRYPTION_NONCE_SIZE];
+    uint8_t nonce[NC_NIP44_IV_SIZE];
 
     NCEncryptionArgs cryptoData;
 
     PRINTL("TEST: Public API argument validation tests")
 
     {
+        TEST(NCEncryptionGetIvSize(NC_ENC_VERSION_NIP44), sizeof(nonce));
+
         /*
         * Test arguments for encryption properties
         */
 
 		uint8_t testBuff32[32];
 
-		TEST(NCSetEncryptionProperty(NULL, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP44), ARG_ERROR_POS_0)
-		TEST(NCSetEncryptionProperty(&cryptoData, 0, 1), E_INVALID_ARG)
+		TEST(NCEncryptionSetProperty(NULL, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP04), ARG_ERROR_POS_0)
+		TEST(NCEncryptionSetProperty(&cryptoData, 0, 1), E_INVALID_ARG)
 
-        TEST(NCSetEncryptionData(NULL, zero32, sig64, sizeof(zero32)), ARG_ERROR_POS_0)
-		TEST(NCSetEncryptionData(&cryptoData, NULL, sig64, sizeof(zero32)), ARG_ERROR_POS_1)
-		TEST(NCSetEncryptionData(&cryptoData, zero32, NULL, sizeof(zero32)), ARG_ERROR_POS_2)
-		TEST(NCSetEncryptionData(&cryptoData, zero32, sig64, 0), ARG_RANGE_ERROR_POS_3)
+        TEST(NCEncryptionSetData(NULL, zero32, sig64, sizeof(zero32)), ARG_ERROR_POS_0)
+		TEST(NCEncryptionSetData(&cryptoData, NULL, sig64, sizeof(zero32)), ARG_ERROR_POS_1)
+		TEST(NCEncryptionSetData(&cryptoData, zero32, NULL, sizeof(zero32)), ARG_ERROR_POS_2)
+		TEST(NCEncryptionSetData(&cryptoData, zero32, sig64, 0), ARG_RANGE_ERROR_POS_3)
 
-        /* Setting any version specific value should fail */
-        TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_NONCE, nonce, sizeof(nonce)), E_VERSION_NOT_SUPPORTED)
+        /* Setting the IV should fail because a version is not set*/
+        TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, nonce, sizeof(nonce)), E_VERSION_NOT_SUPPORTED);
 
         /* Set to nip44 to continue nip44 tests */
-        TEST(NCSetEncryptionProperty(&cryptoData, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP44), NC_SUCCESS)
-
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, 0, nonce, sizeof(nonce)), E_INVALID_ARG)
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_NONCE, NULL, sizeof(nonce)), ARG_ERROR_POS_2)
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_NONCE, nonce, 0), ARG_RANGE_ERROR_POS_3)
-		/* Nonce size should fail if smaller than the required nonce size */
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_NONCE, nonce, NC_ENCRYPTION_NONCE_SIZE - 1), ARG_RANGE_ERROR_POS_3)
-
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, 0, hmacKeyOut, sizeof(hmacKeyOut)), E_INVALID_ARG)
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, NULL, sizeof(hmacKeyOut)), ARG_ERROR_POS_2)
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, hmacKeyOut, 0), ARG_RANGE_ERROR_POS_3)
+        TEST(NCEncryptionSetProperty(&cryptoData, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP44), NC_SUCCESS)
+
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, 0, nonce, sizeof(nonce)), E_INVALID_ARG)
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, NULL, sizeof(nonce)), ARG_ERROR_POS_2)
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, nonce, 0), ARG_RANGE_ERROR_POS_3)
+		/* Nonce size should fail if not exactly the required nonce size */
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, nonce, NC_NIP44_IV_SIZE - 1), ARG_RANGE_ERROR_POS_3)
+        TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, nonce, NC_NIP44_IV_SIZE + 1), ARG_RANGE_ERROR_POS_3)
+
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, 0, hmacKeyOut, sizeof(hmacKeyOut)), E_INVALID_ARG)
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, NULL, sizeof(hmacKeyOut)), ARG_ERROR_POS_2)
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, hmacKeyOut, 0), ARG_RANGE_ERROR_POS_3)
         /* Key size should fail if smaller than the required nip44 key size */
-        TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, hmacKeyOut, NC_HMAC_KEY_SIZE - 1), ARG_RANGE_ERROR_POS_3) 
+        TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, hmacKeyOut, NC_HMAC_KEY_SIZE - 1), ARG_RANGE_ERROR_POS_3) 
+
 		
         /* Test for nip04 */
         
         /* Any nip04 specific properties should fail since nip44 has already been set */
-
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP04_IV, testBuff32, sizeof(testBuff32)), E_VERSION_NOT_SUPPORTED)
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP04_KEY, testBuff32, sizeof(testBuff32)), E_VERSION_NOT_SUPPORTED)
+		
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_NIP04_KEY, testBuff32, sizeof(testBuff32)), E_VERSION_NOT_SUPPORTED)
 
 		/* Set to nip04 to continue nip04 tests */
-		ENSURE(NCSetEncryptionProperty(&cryptoData, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP04) == NC_SUCCESS)
+		ENSURE(NCEncryptionSetProperty(&cryptoData, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP04) == NC_SUCCESS)
 
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP04_IV, NULL, sizeof(testBuff32)), ARG_ERROR_POS_2)
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP04_IV, testBuff32, 0), ARG_RANGE_ERROR_POS_3)
-        /* IV size should fail if smaller than IV */
-        TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP04_IV, testBuff32, NC_NIP04_AES_IV_SIZE - 1), ARG_RANGE_ERROR_POS_3)
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, NULL, sizeof(testBuff32)), ARG_ERROR_POS_2)
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, testBuff32, 0), ARG_RANGE_ERROR_POS_3)
+        /* IV size should fail if not exact size IV for the version */
+        TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, testBuff32, NC_NIP04_IV_SIZE - 1), ARG_RANGE_ERROR_POS_3)
+        TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, testBuff32, NC_NIP04_IV_SIZE + 1), ARG_RANGE_ERROR_POS_3)
 
 
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP04_KEY, NULL, sizeof(testBuff32)), ARG_ERROR_POS_2)
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP04_KEY, testBuff32, 0), ARG_RANGE_ERROR_POS_3)
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_NIP04_KEY, NULL, sizeof(testBuff32)), ARG_ERROR_POS_2)
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_NIP04_KEY, testBuff32, 0), ARG_RANGE_ERROR_POS_3)
 		/* Key size should fail if smaller than the required nip04 key size */
-		TEST(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP04_KEY, testBuff32, NC_NIP04_AES_KEY_SIZE - 1), ARG_RANGE_ERROR_POS_3)
+		TEST(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_NIP04_KEY, testBuff32, NC_NIP04_AES_KEY_SIZE - 1), ARG_RANGE_ERROR_POS_3)
     }
 
     /* Prep the crypto structure for proper usage */
-	ENSURE(NCSetEncryptionProperty(&cryptoData, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP44) == NC_SUCCESS);
-    ENSURE(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_NONCE, nonce, sizeof(nonce)) == NC_SUCCESS);
-    ENSURE(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, hmacKeyOut, sizeof(hmacKeyOut)) == NC_SUCCESS);
+	ENSURE(NCEncryptionSetProperty(&cryptoData, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP44) == NC_SUCCESS);
+    ENSURE(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, nonce, sizeof(nonce)) == NC_SUCCESS);
+    ENSURE(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, hmacKeyOut, sizeof(hmacKeyOut)) == NC_SUCCESS);
 	
     /* Assign the encryption material */
-    ENSURE(NCSetEncryptionData(&cryptoData, zero32, sig64, sizeof(zero32)) == NC_SUCCESS);
+    ENSURE(NCEncryptionSetData(&cryptoData, zero32, sig64, sizeof(zero32)) == NC_SUCCESS);
 
 
     FillRandomData(ctxRandom, 32);
@@ -543,7 +547,7 @@ static int TestCorrectEncryption(const NCContext* context)
     NCPublicKey pubKey2;
   
     uint8_t hmacKeyOut[NC_HMAC_KEY_SIZE];
-    uint8_t nonce[NC_ENCRYPTION_NONCE_SIZE];
+    uint8_t nonce[NC_NIP44_IV_SIZE];  //nonce is set by cipher spec, shoud use NCEncryptionGetIvSize() in production
     uint8_t mac[NC_ENCRYPTION_MAC_SIZE];
 
     uint8_t plainText[TEST_ENC_DATA_SIZE];
@@ -555,12 +559,13 @@ static int TestCorrectEncryption(const NCContext* context)
 
     PRINTL("TEST: Correct encryption")
 
-    ENSURE(NCSetEncryptionProperty(&cryptoData, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP44) == NC_SUCCESS);
-    ENSURE(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_NONCE, nonce, sizeof(nonce)) == NC_SUCCESS);
-    ENSURE(NCSetEncryptionPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, hmacKeyOut, NC_HMAC_KEY_SIZE) == NC_SUCCESS);
+    ENSURE(NCEncryptionGetIvSize(NC_ENC_VERSION_NIP44) == (uint32_t)sizeof(nonce));
+    ENSURE(NCEncryptionSetProperty(&cryptoData, NC_ENC_SET_VERSION, NC_ENC_VERSION_NIP44) == NC_SUCCESS);
+    ENSURE(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_IV, nonce, sizeof(nonce)) == NC_SUCCESS);
+    ENSURE(NCEncryptionSetPropertyEx(&cryptoData, NC_ENC_SET_NIP44_MAC_KEY, hmacKeyOut, NC_HMAC_KEY_SIZE) == NC_SUCCESS);
 
     /* Assign the encryption material */
-    ENSURE(NCSetEncryptionData(&cryptoData, plainText, cipherText, TEST_ENC_DATA_SIZE) == NC_SUCCESS);
+    ENSURE(NCEncryptionSetData(&cryptoData, plainText, cipherText, TEST_ENC_DATA_SIZE) == NC_SUCCESS);
    
     macVerifyArgs.nonce32 = nonce;    /* nonce is shared */
     macVerifyArgs.mac32 = mac;
@@ -634,10 +639,12 @@ static int TestUtilNip44Encryption(
     
     ENSURE(ctx != NULL);
 
+    TEST(ncSpanGetSize(nonce), (uint32_t)NCUtilCipherGetIvSize(ctx));
+
     TEST(NCUtilCipherInit(ctx, plainText.data, plainText.size), NC_SUCCESS);
 
     /* Nonce is required for nip44 encryption */
-    TEST(NCUtilCipherSetProperty(ctx, NC_ENC_SET_NIP44_NONCE, nonce.data, nonce.size), NC_SUCCESS);
+    TEST(NCUtilCipherSetProperty(ctx, NC_ENC_SET_IV, nonce.data, nonce.size), NC_SUCCESS);
 
     /* Cipher update should return the  */
     TEST(NCUtilCipherUpdate(ctx, libCtx, NCByteCastToSecretKey(sendKey.data), &recvPubKey), NC_SUCCESS);
@@ -650,7 +657,7 @@ static int TestUtilNip44Encryption(
     TASSERT(outData != NULL);
 
     /* Read the encrypted payload to test */
-    TEST(NCUtilCipherReadOutput(ctx, outData, cipherOutputSize), cipherOutputSize);
+    TEST(NCUtilCipherReadOutput(ctx, outData, (uint32_t)cipherOutputSize), cipherOutputSize);
 
     /* Ensure encrypted payload matches */
     TEST(memcmp(outData, expected.data, cipherOutputSize), 0);
@@ -699,7 +706,7 @@ static int TestUtilNip44Decryption(
     TASSERT(outData != NULL);
 
     /* Read the encrypted payload to test */
-    TEST(NCUtilCipherReadOutput(ctx, outData, plaintextSize), plaintextSize);
+    TEST(NCUtilCipherReadOutput(ctx, outData, (uint32_t)plaintextSize), plaintextSize);
 
     /* Ensure encrypted payload matches */
     TEST(memcmp(outData, expectedPt.data, plaintextSize), 0);
@@ -729,7 +736,7 @@ static int TestUtilFunctions(const NCContext* libCtx)
 	    /* From the nip44 vectors file */
 		span_t sendKey = FromHexString("0000000000000000000000000000000000000000000000000000000000000001", sizeof(NCSecretKey));
 		span_t recvKey = FromHexString("0000000000000000000000000000000000000000000000000000000000000002", sizeof(NCSecretKey));
-		span_t nonce = FromHexString("0000000000000000000000000000000000000000000000000000000000000001", NC_ENCRYPTION_NONCE_SIZE);
+		span_t nonce = FromHexString("0000000000000000000000000000000000000000000000000000000000000001", NC_NIP44_IV_SIZE);
         span_t payload = FromHexString("02000000000000000000000000000000000000000000000000000000000000000179ed06e5548ad3ff58ca920e6c0b4329f6040230f7e6e5641f20741780f0adc35a09794259929a02bb06ad8e8cf709ee4ccc567e9d514cdf5781af27a3e905e55b1b", 99);
 		span_t plainText = FromHexString("61", 1);