X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=sha2%2Fsha224.c;fp=sha2%2Fsha224.c;h=f54d0a3e45ea4767f2002b18537589566a1d6bc8;hb=9132c1117c69c30ff96919343682174050eb73ca;hp=0000000000000000000000000000000000000000;hpb=ba2a32a1722c09eaa78a611252f1be319baae8f9;p=arm-crypto-lib.git

diff --git a/sha2/sha224.c b/sha2/sha224.c
new file mode 100644
index 0000000..f54d0a3
--- /dev/null
+++ b/sha2/sha224.c
@@ -0,0 +1,128 @@
+/* sha224.c */
+/*
+    This file is part of the ARM-Crypto-Lib.
+    Copyright (C) 2006-2010  Daniel Otte (daniel.otte@rub.de)
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * \file		sha224.c
+ * \author		Daniel Otte
+ * \date		16.05.2006
+ *
+ * \par License:
+ * 	GPL
+ *
+ * \brief SHA-224 implementation.
+ *
+ *
+ */
+
+#include <stdint.h>
+#include <string.h> /* for memcpy, memmove, memset */
+#include "sha2_small_common.h"
+#include "sha224.h"
+
+#define LITTLE_ENDIAN
+
+#if defined LITTLE_ENDIAN
+#elif defined BIG_ENDIAN
+#else
+	#error specify endianess!!!
+#endif
+
+
+/*************************************************************************/
+
+const
+uint32_t sha224_init_vector[]={
+	0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
+	0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4
+};
+
+
+/*************************************************************************/
+
+/**
+ * \brief \c sh224_init initialises a sha224 context for hashing.
+ * \c sh224_init c initialises the given sha224 context for hashing
+ * @param state pointer to a sha224 context
+ * @return none
+ */
+void sha224_init(sha224_ctx_t *state){
+	state->length=0;
+	memcpy(state->h, sha224_init_vector, 8*4);
+}
+
+/*************************************************************************/
+void sha224_nextBlock (sha224_ctx_t *state, const void* block){
+	sha2_small_common_nextBlock(state, block);
+}
+
+/*************************************************************************/
+void sha224_lastBlock (sha224_ctx_t *state, const void* block, uint16_t length_b){
+	sha2_small_common_lastBlock(state, block, length_b);
+}
+/*************************************************************************/
+
+/**
+ * \brief function to process the last block being hashed
+ * @param state Pointer to the context in which this block should be processed.
+ * @param block Pointer to the message wich should be hashed.
+ * @param length is the length of only THIS block in BITS not in bytes!
+ *  bits are big endian, meaning high bits come first.
+ * 	if you have a message with bits at the end, the byte must be padded with zeros
+ */
+
+/*************************************************************************/
+
+/*
+ * length in bits!
+ */
+void sha224(void* dest, const void* msg, uint32_t length_b){ /* length could be choosen longer but this is for µC */
+	sha224_ctx_t s;
+	sha224_init(&s);
+	while(length_b >= SHA224_BLOCK_BITS){
+		sha224_nextBlock(&s, msg);
+		msg = (uint8_t*)msg + SHA224_BLOCK_BITS/8;
+		length_b -= SHA224_BLOCK_BITS;
+	}
+	sha224_lastBlock(&s, msg, length_b);
+	sha224_ctx2hash(dest,&s);
+}
+
+
+
+/*************************************************************************/
+
+void sha224_ctx2hash(void* dest, const sha224_ctx_t *state){
+#if defined LITTLE_ENDIAN
+	uint8_t i, j, *s=(uint8_t*)(state->h);
+	i=7;
+	do{
+		j=3;
+		do{
+			*((uint8_t*)dest) = s[j];
+			dest = (uint8_t*)dest + 1;
+		}while(j--);
+		s += 4;
+	}while(--i);
+#elif BIG_ENDIAN
+	memcpy(dest, state->h, 28);
+#else
+# error unsupported endian type!
+#endif
+}
+
+