MD5 library

diff --git a/MD5.cpp b/MD5.cpp
new file mode 100644 (file)
index 0000000..56daa77
--- /dev/null
+++ b/MD5.cpp
@@ -0,0 +1,301 @@
+#include "MD5.h"
+
+MD5::MD5()
+{
+       //nothing
+       return;
+}
+
+char* MD5::make_digest(const unsigned char *digest, int len) /* {{{ */
+{
+       char * md5str = (char*) malloc(sizeof(char)*(len*2+1));
+       static const char hexits[17] = "0123456789abcdef";
+       int i;
+
+       for (i = 0; i < len; i++) {
+               md5str[i * 2]       = hexits[digest[i] >> 4];
+               md5str[(i * 2) + 1] = hexits[digest[i] &  0x0F];
+       }
+       md5str[len * 2] = '\0';
+       return md5str;
+}
+
+/*
+ * The basic MD5 functions.
+ *
+ * E and G are optimized compared to their RFC 1321 definitions for
+ * architectures that lack an AND-NOT instruction, just like in Colin Plumb's
+ * implementation.
+ * E() has been used instead of F() because F() is already defined in the Arduino core
+ */
+#define E(x, y, z)                     ((z) ^ ((x) & ((y) ^ (z))))
+#define G(x, y, z)                     ((y) ^ ((z) & ((x) ^ (y))))
+#define H(x, y, z)                     ((x) ^ (y) ^ (z))
+#define I(x, y, z)                     ((y) ^ ((x) | ~(z)))
+
+/*
+ * The MD5 transformation for all four rounds.
+ */
+#define STEP(f, a, b, c, d, x, t, s) \
+       (a) += f((b), (c), (d)) + (x) + (t); \
+       (a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
+       (a) += (b);
+
+/*
+ * SET reads 4 input bytes in little-endian byte order and stores them
+ * in a properly aligned word in host byte order.
+ *
+ * The check for little-endian architectures that tolerate unaligned
+ * memory accesses is just an optimization.  Nothing will break if it
+ * doesn't work.
+ */
+#if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
+# define SET(n) \
+       (*(MD5_u32plus *)&ptr[(n) * 4])
+# define GET(n) \
+       SET(n)
+#else
+# define SET(n) \
+       (ctx->block[(n)] = \
+       (MD5_u32plus)ptr[(n) * 4] | \
+       ((MD5_u32plus)ptr[(n) * 4 + 1] << 8) | \
+       ((MD5_u32plus)ptr[(n) * 4 + 2] << 16) | \
+       ((MD5_u32plus)ptr[(n) * 4 + 3] << 24))
+# define GET(n) \
+       (ctx->block[(n)])
+#endif
+
+/*
+ * This processes one or more 64-byte data blocks, but does NOT update
+ * the bit counters.  There are no alignment requirements.
+ */
+const void *MD5::body(void *ctxBuf, const void *data, size_t size)
+{
+       MD5_CTX *ctx = (MD5_CTX*)ctxBuf;
+       const unsigned char *ptr;
+       MD5_u32plus a, b, c, d;
+       MD5_u32plus saved_a, saved_b, saved_c, saved_d;
+
+       ptr = (unsigned char*)data;
+
+       a = ctx->a;
+       b = ctx->b;
+       c = ctx->c;
+       d = ctx->d;
+
+       do {
+               saved_a = a;
+               saved_b = b;
+               saved_c = c;
+               saved_d = d;
+
+/* Round 1
+ * E() has been used instead of F() because F() is already defined in the Arduino core
+ */
+               STEP(E, a, b, c, d, SET(0), 0xd76aa478, 7)
+               STEP(E, d, a, b, c, SET(1), 0xe8c7b756, 12)
+               STEP(E, c, d, a, b, SET(2), 0x242070db, 17)
+               STEP(E, b, c, d, a, SET(3), 0xc1bdceee, 22)
+               STEP(E, a, b, c, d, SET(4), 0xf57c0faf, 7)
+               STEP(E, d, a, b, c, SET(5), 0x4787c62a, 12)
+               STEP(E, c, d, a, b, SET(6), 0xa8304613, 17)
+               STEP(E, b, c, d, a, SET(7), 0xfd469501, 22)
+               STEP(E, a, b, c, d, SET(8), 0x698098d8, 7)
+               STEP(E, d, a, b, c, SET(9), 0x8b44f7af, 12)
+               STEP(E, c, d, a, b, SET(10), 0xffff5bb1, 17)
+               STEP(E, b, c, d, a, SET(11), 0x895cd7be, 22)
+               STEP(E, a, b, c, d, SET(12), 0x6b901122, 7)
+               STEP(E, d, a, b, c, SET(13), 0xfd987193, 12)
+               STEP(E, c, d, a, b, SET(14), 0xa679438e, 17)
+               STEP(E, b, c, d, a, SET(15), 0x49b40821, 22)
+
+/* Round 2 */
+               STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
+               STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
+               STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
+               STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
+               STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
+               STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
+               STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
+               STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
+               STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
+               STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
+               STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
+               STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
+               STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
+               STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
+               STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
+               STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
+
+/* Round 3 */
+               STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
+               STEP(H, d, a, b, c, GET(8), 0x8771f681, 11)
+               STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
+               STEP(H, b, c, d, a, GET(14), 0xfde5380c, 23)
+               STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
+               STEP(H, d, a, b, c, GET(4), 0x4bdecfa9, 11)
+               STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
+               STEP(H, b, c, d, a, GET(10), 0xbebfbc70, 23)
+               STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
+               STEP(H, d, a, b, c, GET(0), 0xeaa127fa, 11)
+               STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
+               STEP(H, b, c, d, a, GET(6), 0x04881d05, 23)
+               STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
+               STEP(H, d, a, b, c, GET(12), 0xe6db99e5, 11)
+               STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
+               STEP(H, b, c, d, a, GET(2), 0xc4ac5665, 23)
+
+/* Round 4 */
+               STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
+               STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
+               STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
+               STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
+               STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
+               STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
+               STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
+               STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
+               STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
+               STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
+               STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
+               STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
+               STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
+               STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
+               STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
+               STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
+
+               a += saved_a;
+               b += saved_b;
+               c += saved_c;
+               d += saved_d;
+
+               ptr += 64;
+       } while (size -= 64);
+
+       ctx->a = a;
+       ctx->b = b;
+       ctx->c = c;
+       ctx->d = d;
+
+       return ptr;
+}
+
+void MD5::MD5Init(void *ctxBuf)
+{
+       MD5_CTX *ctx = (MD5_CTX*)ctxBuf;
+       ctx->a = 0x67452301;
+       ctx->b = 0xefcdab89;
+       ctx->c = 0x98badcfe;
+       ctx->d = 0x10325476;
+
+       ctx->lo = 0;
+       ctx->hi = 0;
+
+    memset(ctx->block, 0, sizeof(ctx->block));
+    memset(ctx->buffer, 0, sizeof(ctx->buffer));
+}
+
+void MD5::MD5Update(void *ctxBuf, const void *data, size_t size)
+{
+       MD5_CTX *ctx = (MD5_CTX*)ctxBuf;
+       MD5_u32plus saved_lo;
+       MD5_u32plus used, free;
+
+       saved_lo = ctx->lo;
+       if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo) {
+               ctx->hi++;
+       }
+       ctx->hi += size >> 29;
+
+       used = saved_lo & 0x3f;
+
+       if (used) {
+               free = 64 - used;
+
+               if (size < free) {
+                       memcpy(&ctx->buffer[used], data, size);
+                       return;
+               }
+
+               memcpy(&ctx->buffer[used], data, free);
+               data = (unsigned char *)data + free;
+               size -= free;
+               body(ctx, ctx->buffer, 64);
+       }
+
+       if (size >= 64) {
+               data = body(ctx, data, size & ~(size_t)0x3f);
+               size &= 0x3f;
+       }
+
+       memcpy(ctx->buffer, data, size);
+}
+
+void MD5::MD5Final(unsigned char *result, void *ctxBuf)
+{
+       MD5_CTX *ctx = (MD5_CTX*)ctxBuf;
+       MD5_u32plus used, free;
+
+       used = ctx->lo & 0x3f;
+
+       ctx->buffer[used++] = 0x80;
+
+       free = 64 - used;
+
+       if (free < 8) {
+               memset(&ctx->buffer[used], 0, free);
+               body(ctx, ctx->buffer, 64);
+               used = 0;
+               free = 64;
+       }
+
+       memset(&ctx->buffer[used], 0, free - 8);
+
+       ctx->lo <<= 3;
+       ctx->buffer[56] = ctx->lo;
+       ctx->buffer[57] = ctx->lo >> 8;
+       ctx->buffer[58] = ctx->lo >> 16;
+       ctx->buffer[59] = ctx->lo >> 24;
+       ctx->buffer[60] = ctx->hi;
+       ctx->buffer[61] = ctx->hi >> 8;
+       ctx->buffer[62] = ctx->hi >> 16;
+       ctx->buffer[63] = ctx->hi >> 24;
+
+       body(ctx, ctx->buffer, 64);
+
+       result[0] = ctx->a;
+       result[1] = ctx->a >> 8;
+       result[2] = ctx->a >> 16;
+       result[3] = ctx->a >> 24;
+       result[4] = ctx->b;
+       result[5] = ctx->b >> 8;
+       result[6] = ctx->b >> 16;
+       result[7] = ctx->b >> 24;
+       result[8] = ctx->c;
+       result[9] = ctx->c >> 8;
+       result[10] = ctx->c >> 16;
+       result[11] = ctx->c >> 24;
+       result[12] = ctx->d;
+       result[13] = ctx->d >> 8;
+       result[14] = ctx->d >> 16;
+       result[15] = ctx->d >> 24;
+
+       memset(ctx, 0, sizeof(*ctx));
+}
+unsigned char* MD5::make_hash(char *arg)
+{
+       MD5_CTX context;
+       unsigned char * hash = (unsigned char *) malloc(16);
+       MD5Init(&context);
+       MD5Update(&context, arg, strlen(arg));
+       MD5Final(hash, &context);
+       return hash;
+}
+unsigned char* MD5::make_hash(char *arg,size_t size)
+{
+       MD5_CTX context;
+       unsigned char * hash = (unsigned char *) malloc(16);
+       MD5Init(&context);
+       MD5Update(&context, arg, size);
+       MD5Final(hash, &context);
+       return hash;
+}
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diff --git a/MD5.h b/MD5.h
new file mode 100644 (file)
index 0000000..3ec8d81
--- /dev/null
+++ b/MD5.h
@@ -0,0 +1,52 @@
+#ifndef MD5_h
+#define MD5_h
+
+#include "Arduino.h"
+
+/*
+ * This is an OpenSSL-compatible implementation of the RSA Data Security,
+ * Inc. MD5 Message-Digest Algorithm (RFC 1321).
+ *
+ * Written by Solar Designer <solar at openwall.com> in 2001, and placed
+ * in the public domain.  There's absolutely no warranty.
+ *
+ * This differs from Colin Plumb's older public domain implementation in
+ * that no 32-bit integer data type is required, there's no compile-time
+ * endianness configuration, and the function prototypes match OpenSSL's.
+ * The primary goals are portability and ease of use.
+ *
+ * This implementation is meant to be fast, but not as fast as possible.
+ * Some known optimizations are not included to reduce source code size
+ * and avoid compile-time configuration.
+ */
+
+/*
+ * Updated by Scott MacVicar for arduino
+ * <scott@macvicar.net>
+ */
+
+#include <string.h>
+
+typedef unsigned long MD5_u32plus;
+
+typedef struct {
+       MD5_u32plus lo, hi;
+       MD5_u32plus a, b, c, d;
+       unsigned char buffer[64];
+       MD5_u32plus block[16];
+} MD5_CTX;
+
+class MD5
+{
+public:
+       MD5();
+       static unsigned char* make_hash(char *arg);
+       static unsigned char* make_hash(char *arg,size_t size);
+       static char* make_digest(const unsigned char *digest, int len);
+       static const void *body(void *ctxBuf, const void *data, size_t size);
+       static void MD5Init(void *ctxBuf);
+       static void MD5Final(unsigned char *result, void *ctxBuf);
+       static void MD5Update(void *ctxBuf, const void *data, size_t size);
+};
+
+#endif
\ No newline at end of file