1 files changed, 0 insertions, 131 deletions
diff --git a/src/crypto/hkdf.c b/src/crypto/hkdf.c
deleted file mode 100644
index 0d91d14..0000000
--- a/src/crypto/hkdf.c
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
-* Copyright (c) 2024 Vaughn Nugent
-*
-* Package: noscrypt
-* File: hkdf.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/.
-*/
-
-
-#include "hkdf.h"
-
-/* Include string for memmove */
-#include <string.h>
-
-#define HKDF_MIN(a, b) (a < b ? a : b)
-
-STATIC_ASSERT(HKDF_IN_BUF_SIZE > SHA256_DIGEST_SIZE, "HDK Buffer must be at least the size of the underlying hashing alg output")
-
-static _nc_fn_inline void ncWriteSpanS(span_t* span, uint32_t offset, const uint8_t* data, uint32_t size)
-{
-	DEBUG_ASSERT2(span != NULL, "Expected span to be non-null")
-	DEBUG_ASSERT2(data != NULL, "Expected data to be non-null")
-	DEBUG_ASSERT2(offset + size <= span->size, "Expected offset + size to be less than span size")
-
-	/* Copy data to span */
-	memmove(span->data + offset, data, size);
-}
-
-static _nc_fn_inline void debugValidateHandler(const struct nc_hkdf_fn_cb_struct* handler)
-{
-	DEBUG_ASSERT(handler != NULL)
-	DEBUG_ASSERT(handler->update != NULL)
-	DEBUG_ASSERT(handler->finish != NULL)
-}
-
-/*
-* The following functions implements the HKDF expand function using an existing
-* HMAC function.
-*
-* This follows the guidence from RFC 5869: https://tools.ietf.org/html/rfc5869
-*/
-
-cstatus_t hkdfExpandProcess(
-	const struct nc_hkdf_fn_cb_struct* handler,
-	void* ctx,
-	const cspan_t* info,
-	span_t* okm
-)
-{
-	cstatus_t result;
-
-	uint8_t counter;
-	uint32_t tLen, okmOffset;
-	uint8_t t[HKDF_IN_BUF_SIZE];
-	cspan_t tSpan, counterSpan;
-
-	debugValidateHandler(handler);
-
-	ncCryptoSecureZero(t, sizeof(t));
-
-	tLen = 0;				/* T(0) is an empty string(zero length) */
-	okmOffset = 0;
-	counter = 1;			/* counter is offset by 1 for init */
-	result = CSTATUS_FAIL;	/* Start in fail state */
-
-	/* counter as a span */
-	ncSpanInitC(&counterSpan, &counter, sizeof(counter));
-
-	/* Compute T(N) = HMAC(prk, T(n-1) | info | n) */
-	while (okmOffset < okm->size)
-	{
-		ncSpanInitC(&tSpan, t, tLen);
-
-		if (handler->update(ctx, &tSpan) != CSTATUS_OK)
-		{
-			goto Exit;
-		}
-
-		if (handler->update(ctx, info) != CSTATUS_OK)
-		{
-			goto Exit;
-		}
-
-		if (handler->update(ctx, &counterSpan) != CSTATUS_OK)
-		{
-			goto Exit;
-		}
-
-		/* 
-		* Write current hash state to t buffer. It is known
-		* that the t buffer must be at least the size of the
-		* underlying hash function output.
-		*/
-		if (handler->finish(ctx, t) != CSTATUS_OK)
-		{
-			goto Exit;
-		}
-
-		/* tlen becomes the hash size or remaining okm size */
-		tLen = HKDF_MIN(okm->size - okmOffset, SHA256_DIGEST_SIZE);
-
-		DEBUG_ASSERT(tLen <= sizeof(t));
-
-		/* write the T buffer back to okm */
-		ncWriteSpanS(okm, okmOffset, t, tLen);
-
-		/* shift base okm pointer by T */
-		okmOffset += tLen;
-
-		/* increment counter */
-		counter++;
-	}
-
-	result = CSTATUS_OK;	/* HMAC operation completed, so set success */
-
-Exit:
-
-	return result;
-}