adding SHA-2 (now complete) in C

[avr-crypto-lib.git] / sha2 / sha512.c

diff --git a/sha2/sha512.c b/sha2/sha512.c
new file mode 100644 (file)
index 0000000..c09f109
--- /dev/null
+++ b/sha2/sha512.c
@@ -0,0 +1,70 @@
+/* sha512.c */
+/*
+    This file is part of the ARM-Crypto-Lib.
+    Copyright (C) 2006-2011 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/>.
+*/
+
+#include <stdint.h>
+#include <string.h>
+#include <avr/pgmspace.h>
+#include "sha2_large_common.h"
+#include "sha512.h"
+
+
+void sha512_nextBlock (sha512_ctx_t* ctx, const void* block){
+       sha2_large_common_nextBlock(ctx, block);
+}
+
+void sha512_lastBlock(sha512_ctx_t* ctx, const void* block, uint16_t length_b){
+       sha2_large_common_lastBlock(ctx, block, length_b);
+}
+
+static const
+uint64_t sha512_init_values[8] PROGMEM = {
+0x6a09e667f3bcc908LL, 0xbb67ae8584caa73bLL, 0x3c6ef372fe94f82bLL, 0xa54ff53a5f1d36f1LL,
+0x510e527fade682d1LL, 0x9b05688c2b3e6c1fLL, 0x1f83d9abfb41bd6bLL, 0x5be0cd19137e2179LL
+};
+
+
+void sha512_init(sha512_ctx_t* ctx){
+       ctx->length = 0;
+       memcpy_P(ctx->h, sha512_init_values, 8*8);
+}
+
+void sha512_ctx2hash(void* dest, const sha512_ctx_t* ctx){
+       uint8_t i=8, j, *s = (uint8_t*)(ctx->h);
+       do{
+               j=7;
+               do{
+                       *((uint8_t*)dest) = s[j];
+                       dest = (uint8_t*)dest + 1;
+               }while(j--);
+               s += 8;
+       }while(--i);
+}
+
+
+void sha512(void* dest, const void* msg, uint32_t length_b){
+       sha512_ctx_t ctx;
+       sha512_init(&ctx);
+       while(length_b >= 1024){
+               sha512_nextBlock(&ctx, msg);
+               msg = (uint8_t*)msg + 1024/8;
+               length_b -= 1024;
+       }
+       sha512_lastBlock(&ctx, msg, length_b);
+       sha512_ctx2hash(dest, &ctx);
+}