1 files changed, 158 insertions, 0 deletions
diff --git a/src/internal/impl/mbedtls.c b/src/internal/impl/mbedtls.c
new file mode 100644
index 0000000..54caa44
--- /dev/null
+++ b/src/internal/impl/mbedtls.c
@@ -0,0 +1,158 @@
+/*
+* Copyright (c) 2024 Vaughn Nugent
+*
+* Package: noscrypt
+* File: mbedtls.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/.
+*/
+
+
+/*
+* This file contains implemntation functions for the required 
+* cryptography primitives of noscrypt. This file stubs functionality
+* using the Mbed-TLS library, if the builder desires to link against
+* it. 
+*/
+
+#ifdef MBEDTLS_CRYPTO_LIB
+
+#include <mbedtls/md.h>
+#include <mbedtls/hkdf.h>
+#include <mbedtls/hmac_drbg.h>
+#include <mbedtls/sha256.h>
+#include <mbedtls/chacha20.h>
+#include <mbedtls/constant_time.h>
+
+#include "../../platform.h"
+#include "../nc-util.h"
+
+/*
+*		EXPORT SUPPORTED FUNCTION OVERRIDES
+*/	
+
+_IMPLSTB const mbedtls_md_info_t* _mbed_sha256_alg(void)
+{
+	const mbedtls_md_info_t* info;
+	/* Get sha256 md info for hdkf operations */
+	info = mbedtls_md_info_from_type(MBEDTLS_MD_SHA256);
+	DEBUG_ASSERT2(info != NULL, "Expected SHA256 md info pointer to be valid")
+	return info;
+}
+
+#ifndef _IMPL_CHACHA20_CRYPT
+	
+	/* Export chacha20 computation */
+	#define _IMPL_CHACHA20_CRYPT _mbed_chacha20_encrypt	
+
+	_IMPLSTB int _mbed_chacha20_encrypt(
+		const uint8_t* key,
+		const uint8_t* nonce,
+		const uint8_t* input,
+		uint8_t* output,
+		size_t dataLen
+	)
+	{
+		/* Counter always starts at 0 */
+		return mbedtls_chacha20_crypt(key, nonce, 0x00u, dataLen, input, output);
+	}
+
+#endif
+
+/* Export sha256 if not already defined */
+#ifndef _IMPL_CRYPTO_SHA256_DIGEST	
+	
+	#define _IMPL_CRYPTO_SHA256_DIGEST			_mbed_sha256_digest	
+
+	_IMPLSTB CStatus _mbed_sha256_digest(const uint8_t* data, size_t dataSize,uint8_t* digestOut32)
+	{
+		return mbedtls_sha256(data, dataSize, digestOut32, 0);
+	}
+
+#endif
+
+/* Export Sha256 hmac if not already defined by other libs */
+#ifndef _IMPL_CRYPTO_SHA256_HMAC
+
+	#define _IMPL_CRYPTO_SHA256_HMAC			_mbed_sha256_hmac
+
+	_IMPLSTB CStatus _mbed_sha256_hmac(
+		const uint8_t* key, size_t keyLen,
+		const uint8_t* data, size_t dataLen,
+		void* hmacOut32
+	)
+	{
+		return mbedtls_md_hmac(
+			_mbed_sha256_alg(),
+			key, keyLen,
+			data, dataLen,
+			hmacOut32
+		);
+	}
+#endif
+
+/* Export hkdf expand if not already defined */
+#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXPAND
+
+	#define _IMPL_CRYPTO_SHA256_HKDF_EXPAND		_mbed_sha256_hkdf_expand
+
+	_IMPLSTB int _mbed_sha256_hkdf_expand(
+		const uint8_t* prk, size_t prkLen,
+		const uint8_t* info, size_t infoLen,
+		void* okm, size_t okmLen
+	)
+	{
+		return mbedtls_hkdf_expand(
+			_mbed_sha256_alg(),
+			prk, prkLen,
+			info, infoLen,
+			okm, okmLen
+		);
+	}
+
+#endif
+
+/* Export hkdf extract if not already defined */
+#ifndef _IMPL_CRYPTO_SHA256_HKDF_EXTRACT
+
+	#define _IMPL_CRYPTO_SHA256_HKDF_EXTRACT		_mbed_sha256_hkdf_extract
+
+	_IMPLSTB int _mbed_sha256_hkdf_extract(
+		const uint8_t* salt, size_t saltLen,
+		const uint8_t* ikm, size_t ikmLen,
+		void* prk
+	)
+	{
+		return mbedtls_hkdf_extract(
+			_mbed_sha256_alg(),
+			salt, saltLen,
+			ikm, ikmLen,
+			prk
+		);
+	}
+#endif
+
+/* Export fixed-time compare if not already defined */
+#ifndef _IMPL_CRYPTO_FIXED_TIME_COMPARE
+
+	#define _IMPL_CRYPTO_FIXED_TIME_COMPARE		_mbed_fixed_time_compare
+
+	/* fixed-time memcmp */
+	_IMPLSTB int _mbed_fixed_time_compare(const uint8_t* a, const uint8_t* b, size_t size)
+	{
+		return mbedtls_ct_memcmp(a, b, size);
+	}
+#endif
+
+#endif
+\ No newline at end of file