Diff: cyclone_crypto/sha512_256.c

Revision:

0:8918a71cdbe9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cyclone_crypto/sha512_256.c	Sat Feb 04 18:15:49 2017 +0000
@@ -0,0 +1,149 @@
+/**
+ * @file sha512_256.c
+ * @brief SHA-512/256 (Secure Hash Algorithm)
+ *
+ * @section License
+ *
+ * Copyright (C) 2010-2017 Oryx Embedded SARL. All rights reserved.
+ *
+ * This file is part of CycloneCrypto Open.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * @section Description
+ *
+ * SHA-512/256 is a secure hash algorithm for computing a condensed representation
+ * of an electronic message. Refer to FIPS 180-4 for more details
+ *
+ * @author Oryx Embedded SARL (www.oryx-embedded.com)
+ * @version 1.7.6
+ **/
+
+//Switch to the appropriate trace level
+#define TRACE_LEVEL CRYPTO_TRACE_LEVEL
+
+//Dependencies
+#include <string.h>
+#include "crypto.h"
+#include "sha512_256.h"
+
+//Check crypto library configuration
+#if (SHA512_256_SUPPORT == ENABLED)
+
+//SHA-512/256 object identifier (2.16.840.1.101.3.4.2.6)
+static const uint8_t sha512_256Oid[] = {0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x06};
+
+//Common interface for hash algorithms
+const HashAlgo sha512_256HashAlgo =
+{
+   "SHA-512/256",
+   sha512_256Oid,
+   sizeof(sha512_256Oid),
+   sizeof(Sha512_256Context),
+   SHA512_256_BLOCK_SIZE,
+   SHA512_256_DIGEST_SIZE,
+   (HashAlgoCompute) sha512_256Compute,
+   (HashAlgoInit) sha512_256Init,
+   (HashAlgoUpdate) sha512_256Update,
+   (HashAlgoFinal) sha512_256Final
+};
+
+
+/**
+ * @brief Digest a message using SHA-512/256
+ * @param[in] data Pointer to the message being hashed
+ * @param[in] length Length of the message
+ * @param[out] digest Pointer to the calculated digest
+ * @return Error code
+ **/
+
+error_t sha512_256Compute(const void *data, size_t length, uint8_t *digest)
+{
+   //Allocate a memory buffer to hold the SHA-512/256 context
+   Sha512_256Context *context = cryptoAllocMem(sizeof(Sha512_256Context));
+   //Failed to allocate memory?
+   if(context == NULL)
+      return ERROR_OUT_OF_MEMORY;
+
+   //Initialize the SHA-512/256 context
+   sha512_256Init(context);
+   //Digest the message
+   sha512_256Update(context, data, length);
+   //Finalize the SHA-512/256 message digest
+   sha512_256Final(context, digest);
+
+   //Free previously allocated memory
+   cryptoFreeMem(context);
+   //Successful processing
+   return NO_ERROR;
+}
+
+
+/**
+ * @brief Initialize SHA-512/256 message digest context
+ * @param[in] context Pointer to the SHA-512/256 context to initialize
+ **/
+
+void sha512_256Init(Sha512_256Context *context)
+{
+   //Set initial hash value
+   context->h[0] = 0x22312194FC2BF72C;
+   context->h[1] = 0x9F555FA3C84C64C2;
+   context->h[2] = 0x2393B86B6F53B151;
+   context->h[3] = 0x963877195940EABD;
+   context->h[4] = 0x96283EE2A88EFFE3;
+   context->h[5] = 0xBE5E1E2553863992;
+   context->h[6] = 0x2B0199FC2C85B8AA;
+   context->h[7] = 0x0EB72DDC81C52CA2;
+
+   //Number of bytes in the buffer
+   context->size = 0;
+   //Total length of the message
+   context->totalSize = 0;
+}
+
+
+/**
+ * @brief Update the SHA-512/256 context with a portion of the message being hashed
+ * @param[in] context Pointer to the SHA-512/256 context
+ * @param[in] data Pointer to the buffer being hashed
+ * @param[in] length Length of the buffer
+ **/
+
+void sha512_256Update(Sha512_256Context *context, const void *data, size_t length)
+{
+   //The function is defined in the exact same manner as SHA-512
+   sha512Update(context, data, length);
+}
+
+
+/**
+ * @brief Finish the SHA-512/256 message digest
+ * @param[in] context Pointer to the SHA-512/256 context
+ * @param[out] digest Calculated digest (optional parameter)
+ **/
+
+void sha512_256Final(Sha512_256Context *context, uint8_t *digest)
+{
+   //The function is defined in the exact same manner as SHA-512
+   sha512Final(context, NULL);
+
+   //Copy the resulting digest
+   if(digest != NULL)
+      memcpy(digest, context->digest, SHA512_256_DIGEST_SIZE);
+}
+
+#endif
+