chore: Update libs, reorder files, internalize private headers

1 files changed, 233 insertions, 0 deletions

diff --git a/src/providers/openssl.c b/src/providers/openssl.c
new file mode 100644
index 0000000..1f31796
--- /dev/null
+++ b/src/providers/openssl.c
@@ -0,0 +1,233 @@
+/*
+* 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 <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>
+
+	#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;
+
+		result = CSTATUS_FAIL;
+	
+		/*
+		* 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;
+		}
+
+		if (!EVP_DigestInit_ex2(ctx, EVP_sha256(), NULL))
+		{
+			goto Cleanup;
+		}
+
+		if (!EVP_DigestUpdate(ctx, prk->data, prk->size)) 
+		{
+			goto Cleanup;
+		}
+		
+		handler.update = _ossl_hkdf_update;
+		handler.finish = _ossl_hkdf_finish;
+
+		result = hkdfExpandProcess(&handler, ctx, info, okm);
+
+	Cleanup:
+
+		EVP_MD_CTX_destroy(ctx);
+
+		return result;
+	}
+
+#endif /* !_IMPL_CRYPTO_SHA256_HKDF_EXPAND */
+
+#ifndef _IMPL_CHACHA20_CRYPT
+
+    #include <openssl/evp.h>
+
+	#define _IMPL_CHACHA20_CRYPT _ossl_chacha20_crypt
+
+	_IMPLSTB cstatus_t _ossl_chacha20_crypt(
+		const uint8_t* key,
+		const uint8_t* nonce,
+		const uint8_t* input,
+		uint8_t* output,
+		uint32_t dataLen
+	)
+	{
+		cstatus_t result;
+		EVP_CIPHER_CTX* ctx;
+
+		result = CSTATUS_FAIL;
+
+		if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
+		{
+			return CSTATUS_FAIL;
+		}
+
+		if (!EVP_EncryptInit_ex(ctx, EVP_chacha20(), NULL, key, nonce))
+		{
+			goto Cleanup;
+		}
+
+		if (!EVP_EncryptUpdate(ctx, output, (int*)&dataLen, input, dataLen))
+		{
+			goto Cleanup;
+		}
+
+		result = CSTATUS_OK;
+
+	Cleanup:
+
+		EVP_CIPHER_CTX_free(ctx);
+
+		return result;
+	}
+
+#endif
+
+#endif	/*!OPENSSL_CRYPTO_LIB */
\ No newline at end of file