Added mechanism to provide alternative cipher / hash implementations
All symmetric cipher algorithms and hash algorithms now include support
for a POLARSSL_XXX_ALT flag that prevents the definition of the
algorithm context structure and all 'core' functions.
diff --git a/include/polarssl/sha2.h b/include/polarssl/sha2.h
index 39d9347..795299e 100644
--- a/include/polarssl/sha2.h
+++ b/include/polarssl/sha2.h
@@ -3,7 +3,7 @@
*
* \brief SHA-224 and SHA-256 cryptographic hash function
*
- * Copyright (C) 2006-2010, Brainspark B.V.
+ * Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
@@ -27,6 +27,8 @@
#ifndef POLARSSL_SHA2_H
#define POLARSSL_SHA2_H
+#include "config.h"
+
#include <string.h>
#ifdef _MSC_VER
@@ -38,6 +40,10 @@
#define POLARSSL_ERR_SHA2_FILE_IO_ERROR -0x0078 /**< Read/write error in file. */
+#if !defined(POLARSSL_SHA2_ALT)
+// Regular implementation
+//
+
/**
* \brief SHA-256 context structure
*/
@@ -82,6 +88,21 @@
*/
void sha2_finish( sha2_context *ctx, unsigned char output[32] );
+/* Internal use */
+void sha2_process( sha2_context *ctx, const unsigned char data[64] );
+
+#ifdef __cplusplus
+}
+#endif
+
+#else /* POLARSSL_SHA2_ALT */
+#include "sha2_alt.h"
+#endif /* POLARSSL_SHA2_ALT */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
/**
* \brief Output = SHA-256( input buffer )
*
@@ -160,9 +181,6 @@
*/
int sha2_self_test( int verbose );
-/* Internal use */
-void sha2_process( sha2_context *ctx, const unsigned char data[64] );
-
#ifdef __cplusplus
}
#endif