Ivan Grokhotkov
A simple CyaSSL-based HMAC-MD5 implementation. Licensed under GPL v2.
Dependents: RFrec_full RFtrans_full
The output will be base64-encoded, with trailing "==", like this:
j62o/jZsAZD9i9m+32lIuQ==
Example
#include "mbed.h"
#include "hmac_md5.h"
Serial pc(USBTX, USBRX); // tx, rx
void main(void)
{
const char * key = "MySecretKey";
const char * text = "message to be signed";
char output[26];
HMAC_MD5(key, text, output);
printf("result = %s\n", output);
while(true){}
}
Diff: md5.c
- Revision:
- 0:83f3dcfa5c8f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/md5.c Wed Feb 06 20:35:03 2013 +0000
@@ -0,0 +1,342 @@
+/* md5.c
+ *
+ * Copyright (C) 2006-2012 Sawtooth Consulting Ltd.
+ *
+ * This file is part of CyaSSL.
+ *
+ * CyaSSL 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.
+ *
+ * CyaSSL 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+
+#ifdef HAVE_CONFIG_H
+ #include <config.h>
+#endif
+
+#include "md5.h"
+
+#ifdef NO_INLINE
+ #include "misc.h"
+#else
+ #include "misc.c"
+#endif
+
+
+#ifdef STM32F2_CRYPTO
+ /*
+ * STM32F2 hardware MD5 support through the STM32F2 standard peripheral
+ * library. Documentation located in STM32F2xx Standard Peripheral Library
+ * document (See note in README).
+ */
+ #include "stm32f2xx.h"
+
+ void InitMd5(Md5* md5)
+ {
+ /* STM32F2 struct notes:
+ * md5->buffer = first 4 bytes used to hold partial block if needed
+ * md5->buffLen = num bytes currently stored in md5->buffer
+ * md5->loLen = num bytes that have been written to STM32 FIFO
+ */
+ XMEMSET(md5->buffer, 0, MD5_REG_SIZE);
+ md5->buffLen = 0;
+ md5->loLen = 0;
+
+ /* initialize HASH peripheral */
+ HASH_DeInit();
+
+ /* configure algo used, algo mode, datatype */
+ HASH->CR &= ~ (HASH_CR_ALGO | HASH_CR_DATATYPE | HASH_CR_MODE);
+ HASH->CR |= (HASH_AlgoSelection_MD5 | HASH_AlgoMode_HASH
+ | HASH_DataType_8b);
+
+ /* reset HASH processor */
+ HASH->CR |= HASH_CR_INIT;
+ }
+
+ void Md5Update(Md5* md5, const byte* data, word32 len)
+ {
+ word32 i = 0;
+ word32 fill = 0;
+ word32 diff = 0;
+
+ /* if saved partial block is available */
+ if (md5->buffLen > 0) {
+ fill = 4 - md5->buffLen;
+
+ /* if enough data to fill, fill and push to FIFO */
+ if (fill <= len) {
+ XMEMCPY((byte*)md5->buffer + md5->buffLen, data, fill);
+ HASH_DataIn(*(uint32_t*)md5->buffer);
+
+ data += fill;
+ len -= fill;
+ md5->loLen += 4;
+ md5->buffLen = 0;
+ } else {
+ /* append partial to existing stored block */
+ XMEMCPY((byte*)md5->buffer + md5->buffLen, data, len);
+ md5->buffLen += len;
+ return;
+ }
+ }
+
+ /* write input block in the IN FIFO */
+ for (i = 0; i < len; i += 4)
+ {
+ diff = len - i;
+ if (diff < 4) {
+ /* store incomplete last block, not yet in FIFO */
+ XMEMSET(md5->buffer, 0, MD5_REG_SIZE);
+ XMEMCPY((byte*)md5->buffer, data, diff);
+ md5->buffLen = diff;
+ } else {
+ HASH_DataIn(*(uint32_t*)data);
+ data+=4;
+ }
+ }
+
+ /* keep track of total data length thus far */
+ md5->loLen += (len - md5->buffLen);
+ }
+
+ void Md5Final(Md5* md5, byte* hash)
+ {
+ __IO uint16_t nbvalidbitsdata = 0;
+
+ /* finish reading any trailing bytes into FIFO */
+ if (md5->buffLen > 0) {
+ HASH_DataIn(*(uint32_t*)md5->buffer);
+ md5->loLen += md5->buffLen;
+ }
+
+ /* calculate number of valid bits in last word of input data */
+ nbvalidbitsdata = 8 * (md5->loLen % MD5_REG_SIZE);
+
+ /* configure number of valid bits in last word of the data */
+ HASH_SetLastWordValidBitsNbr(nbvalidbitsdata);
+
+ /* start HASH processor */
+ HASH_StartDigest();
+
+ /* wait until Busy flag == RESET */
+ while (HASH_GetFlagStatus(HASH_FLAG_BUSY) != RESET) {}
+
+ /* read message digest */
+ md5->digest[0] = HASH->HR[0];
+ md5->digest[1] = HASH->HR[1];
+ md5->digest[2] = HASH->HR[2];
+ md5->digest[3] = HASH->HR[3];
+
+ ByteReverseWords(md5->digest, md5->digest, MD5_DIGEST_SIZE);
+
+ XMEMCPY(hash, md5->digest, MD5_DIGEST_SIZE);
+
+ InitMd5(md5); /* reset state */
+ }
+
+#else /* CTaoCrypt software implementation */
+
+#ifndef min
+
+ static INLINE word32 min(word32 a, word32 b)
+ {
+ return a > b ? b : a;
+ }
+
+#endif /* min */
+
+
+void InitMd5(Md5* md5)
+{
+ md5->digest[0] = 0x67452301L;
+ md5->digest[1] = 0xefcdab89L;
+ md5->digest[2] = 0x98badcfeL;
+ md5->digest[3] = 0x10325476L;
+
+ md5->buffLen = 0;
+ md5->loLen = 0;
+ md5->hiLen = 0;
+}
+
+
+static void Transform(Md5* md5)
+{
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+#define MD5STEP(f, w, x, y, z, data, s) \
+ w = rotlFixed(w + f(x, y, z) + data, s) + x
+
+ /* Copy context->state[] to working vars */
+ word32 a = md5->digest[0];
+ word32 b = md5->digest[1];
+ word32 c = md5->digest[2];
+ word32 d = md5->digest[3];
+
+ MD5STEP(F1, a, b, c, d, md5->buffer[0] + 0xd76aa478, 7);
+ MD5STEP(F1, d, a, b, c, md5->buffer[1] + 0xe8c7b756, 12);
+ MD5STEP(F1, c, d, a, b, md5->buffer[2] + 0x242070db, 17);
+ MD5STEP(F1, b, c, d, a, md5->buffer[3] + 0xc1bdceee, 22);
+ MD5STEP(F1, a, b, c, d, md5->buffer[4] + 0xf57c0faf, 7);
+ MD5STEP(F1, d, a, b, c, md5->buffer[5] + 0x4787c62a, 12);
+ MD5STEP(F1, c, d, a, b, md5->buffer[6] + 0xa8304613, 17);
+ MD5STEP(F1, b, c, d, a, md5->buffer[7] + 0xfd469501, 22);
+ MD5STEP(F1, a, b, c, d, md5->buffer[8] + 0x698098d8, 7);
+ MD5STEP(F1, d, a, b, c, md5->buffer[9] + 0x8b44f7af, 12);
+ MD5STEP(F1, c, d, a, b, md5->buffer[10] + 0xffff5bb1, 17);
+ MD5STEP(F1, b, c, d, a, md5->buffer[11] + 0x895cd7be, 22);
+ MD5STEP(F1, a, b, c, d, md5->buffer[12] + 0x6b901122, 7);
+ MD5STEP(F1, d, a, b, c, md5->buffer[13] + 0xfd987193, 12);
+ MD5STEP(F1, c, d, a, b, md5->buffer[14] + 0xa679438e, 17);
+ MD5STEP(F1, b, c, d, a, md5->buffer[15] + 0x49b40821, 22);
+
+ MD5STEP(F2, a, b, c, d, md5->buffer[1] + 0xf61e2562, 5);
+ MD5STEP(F2, d, a, b, c, md5->buffer[6] + 0xc040b340, 9);
+ MD5STEP(F2, c, d, a, b, md5->buffer[11] + 0x265e5a51, 14);
+ MD5STEP(F2, b, c, d, a, md5->buffer[0] + 0xe9b6c7aa, 20);
+ MD5STEP(F2, a, b, c, d, md5->buffer[5] + 0xd62f105d, 5);
+ MD5STEP(F2, d, a, b, c, md5->buffer[10] + 0x02441453, 9);
+ MD5STEP(F2, c, d, a, b, md5->buffer[15] + 0xd8a1e681, 14);
+ MD5STEP(F2, b, c, d, a, md5->buffer[4] + 0xe7d3fbc8, 20);
+ MD5STEP(F2, a, b, c, d, md5->buffer[9] + 0x21e1cde6, 5);
+ MD5STEP(F2, d, a, b, c, md5->buffer[14] + 0xc33707d6, 9);
+ MD5STEP(F2, c, d, a, b, md5->buffer[3] + 0xf4d50d87, 14);
+ MD5STEP(F2, b, c, d, a, md5->buffer[8] + 0x455a14ed, 20);
+ MD5STEP(F2, a, b, c, d, md5->buffer[13] + 0xa9e3e905, 5);
+ MD5STEP(F2, d, a, b, c, md5->buffer[2] + 0xfcefa3f8, 9);
+ MD5STEP(F2, c, d, a, b, md5->buffer[7] + 0x676f02d9, 14);
+ MD5STEP(F2, b, c, d, a, md5->buffer[12] + 0x8d2a4c8a, 20);
+
+ MD5STEP(F3, a, b, c, d, md5->buffer[5] + 0xfffa3942, 4);
+ MD5STEP(F3, d, a, b, c, md5->buffer[8] + 0x8771f681, 11);
+ MD5STEP(F3, c, d, a, b, md5->buffer[11] + 0x6d9d6122, 16);
+ MD5STEP(F3, b, c, d, a, md5->buffer[14] + 0xfde5380c, 23);
+ MD5STEP(F3, a, b, c, d, md5->buffer[1] + 0xa4beea44, 4);
+ MD5STEP(F3, d, a, b, c, md5->buffer[4] + 0x4bdecfa9, 11);
+ MD5STEP(F3, c, d, a, b, md5->buffer[7] + 0xf6bb4b60, 16);
+ MD5STEP(F3, b, c, d, a, md5->buffer[10] + 0xbebfbc70, 23);
+ MD5STEP(F3, a, b, c, d, md5->buffer[13] + 0x289b7ec6, 4);
+ MD5STEP(F3, d, a, b, c, md5->buffer[0] + 0xeaa127fa, 11);
+ MD5STEP(F3, c, d, a, b, md5->buffer[3] + 0xd4ef3085, 16);
+ MD5STEP(F3, b, c, d, a, md5->buffer[6] + 0x04881d05, 23);
+ MD5STEP(F3, a, b, c, d, md5->buffer[9] + 0xd9d4d039, 4);
+ MD5STEP(F3, d, a, b, c, md5->buffer[12] + 0xe6db99e5, 11);
+ MD5STEP(F3, c, d, a, b, md5->buffer[15] + 0x1fa27cf8, 16);
+ MD5STEP(F3, b, c, d, a, md5->buffer[2] + 0xc4ac5665, 23);
+
+ MD5STEP(F4, a, b, c, d, md5->buffer[0] + 0xf4292244, 6);
+ MD5STEP(F4, d, a, b, c, md5->buffer[7] + 0x432aff97, 10);
+ MD5STEP(F4, c, d, a, b, md5->buffer[14] + 0xab9423a7, 15);
+ MD5STEP(F4, b, c, d, a, md5->buffer[5] + 0xfc93a039, 21);
+ MD5STEP(F4, a, b, c, d, md5->buffer[12] + 0x655b59c3, 6);
+ MD5STEP(F4, d, a, b, c, md5->buffer[3] + 0x8f0ccc92, 10);
+ MD5STEP(F4, c, d, a, b, md5->buffer[10] + 0xffeff47d, 15);
+ MD5STEP(F4, b, c, d, a, md5->buffer[1] + 0x85845dd1, 21);
+ MD5STEP(F4, a, b, c, d, md5->buffer[8] + 0x6fa87e4f, 6);
+ MD5STEP(F4, d, a, b, c, md5->buffer[15] + 0xfe2ce6e0, 10);
+ MD5STEP(F4, c, d, a, b, md5->buffer[6] + 0xa3014314, 15);
+ MD5STEP(F4, b, c, d, a, md5->buffer[13] + 0x4e0811a1, 21);
+ MD5STEP(F4, a, b, c, d, md5->buffer[4] + 0xf7537e82, 6);
+ MD5STEP(F4, d, a, b, c, md5->buffer[11] + 0xbd3af235, 10);
+ MD5STEP(F4, c, d, a, b, md5->buffer[2] + 0x2ad7d2bb, 15);
+ MD5STEP(F4, b, c, d, a, md5->buffer[9] + 0xeb86d391, 21);
+
+ /* Add the working vars back into digest state[] */
+ md5->digest[0] += a;
+ md5->digest[1] += b;
+ md5->digest[2] += c;
+ md5->digest[3] += d;
+}
+
+
+static INLINE void AddLength(Md5* md5, word32 len)
+{
+ word32 tmp = md5->loLen;
+ if ( (md5->loLen += len) < tmp)
+ md5->hiLen++; /* carry low to high */
+}
+
+
+void Md5Update(Md5* md5, const byte* data, word32 len)
+{
+ /* do block size increments */
+ byte* local = (byte*)md5->buffer;
+
+ while (len) {
+ word32 add = min(len, MD5_BLOCK_SIZE - md5->buffLen);
+ XMEMCPY(&local[md5->buffLen], data, add);
+
+ md5->buffLen += add;
+ data += add;
+ len -= add;
+
+ if (md5->buffLen == MD5_BLOCK_SIZE) {
+ #ifdef BIG_ENDIAN_ORDER
+ ByteReverseBytes(local, local, MD5_BLOCK_SIZE);
+ #endif
+ Transform(md5);
+ AddLength(md5, MD5_BLOCK_SIZE);
+ md5->buffLen = 0;
+ }
+ }
+}
+
+
+void Md5Final(Md5* md5, byte* hash)
+{
+ byte* local = (byte*)md5->buffer;
+
+ AddLength(md5, md5->buffLen); /* before adding pads */
+
+ local[md5->buffLen++] = 0x80; /* add 1 */
+
+ /* pad with zeros */
+ if (md5->buffLen > MD5_PAD_SIZE) {
+ XMEMSET(&local[md5->buffLen], 0, MD5_BLOCK_SIZE - md5->buffLen);
+ md5->buffLen += MD5_BLOCK_SIZE - md5->buffLen;
+
+ #ifdef BIG_ENDIAN_ORDER
+ ByteReverseBytes(local, local, MD5_BLOCK_SIZE);
+ #endif
+ Transform(md5);
+ md5->buffLen = 0;
+ }
+ XMEMSET(&local[md5->buffLen], 0, MD5_PAD_SIZE - md5->buffLen);
+
+ /* put lengths in bits */
+ md5->hiLen = (md5->loLen >> (8*sizeof(md5->loLen) - 3)) +
+ (md5->hiLen << 3);
+ md5->loLen = md5->loLen << 3;
+
+ /* store lengths */
+ #ifdef BIG_ENDIAN_ORDER
+ ByteReverseBytes(local, local, MD5_BLOCK_SIZE);
+ #endif
+ /* ! length ordering dependent on digest endian type ! */
+ XMEMCPY(&local[MD5_PAD_SIZE], &md5->loLen, sizeof(word32));
+ XMEMCPY(&local[MD5_PAD_SIZE + sizeof(word32)], &md5->hiLen, sizeof(word32));
+
+ Transform(md5);
+ #ifdef BIG_ENDIAN_ORDER
+ ByteReverseWords(md5->digest, md5->digest, MD5_DIGEST_SIZE);
+ #endif
+ XMEMCPY(hash, md5->digest, MD5_DIGEST_SIZE);
+
+ InitMd5(md5); /* reset state */
+}
+
+#endif /* STM32F2_CRYPTO */
+