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@@ -46,11 +46,28 @@
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* "Un-inlined" code using loops and static const tables in order to
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* reduce generated code size (on i386 from approx 4k to approx 2.5k).
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*
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- * WARNING!!! Changed PADDING array from a staticly allocated object to
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- * a dynamicly generated one. Although it was declared static
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- * and not static const, it doesn't appear that it ever changes.
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+ * June 29, 2001 Manuel Novoa III
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+ *
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+ * Completely removed static PADDING array.
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+ *
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+ * Reintroduced the loop unrolling in MD5_Transform and added the
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+ * MD5_SIZE_OVER_SPEED option for configurability. Define below as:
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+ * 0 fully unrolled loops
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+ * 1 partially unrolled (4 ops per loop)
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+ * 2 no unrolling -- introduces the need to swap 4 variables (slow)
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+ * 3 no unrolling and all 4 loops merged into one with switch
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+ * in each loop (glacial)
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+ * On i386, sizes are roughly (-Os -fno-builtin):
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+ * 0: 3k 1: 2.5k 2: 2.2k 3: 2k
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*/
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+/*
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+ * Valid values are 1 (fastest/largest) to 3 (smallest/slowest).
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+ */
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+#define MD5_SIZE_OVER_SPEED 3
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+
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+/**********************************************************************/
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+
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#include <sys/types.h>
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#include <string.h>
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#include <unistd.h>
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@@ -224,28 +241,14 @@ void MD5Update ( MD5_CTX *context, const unsigned char *input, unsigned int inpu
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* MD5 padding. Adds padding followed by original length.
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*/
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-#define STATIC_PADDING 0
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-#if STATIC_PADDING
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-static unsigned char PADDING[64] = {
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- 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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-};
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-#endif
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-
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void MD5Pad ( MD5_CTX *context)
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{
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unsigned char bits[8];
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unsigned int index, padLen;
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-
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-#if !STATIC_PADDING
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unsigned char PADDING[64];
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- for (index = 0 ; index < sizeof(PADDING) ; index++) {
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- PADDING[index] = 0;
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- }
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+ memset(PADDING, 0, sizeof(PADDING));
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PADDING[0] = 0x80;
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-#endif
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/* Save number of bits */
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Encode (bits, context->count, 8);
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@@ -283,76 +286,236 @@ MD5Transform (state, block)
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u_int32_t state[4];
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const unsigned char block[64];
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{
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- u_int32_t a, b, c, d, x[16], temp;
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+ u_int32_t a, b, c, d, x[16];
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+
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+#if MD5_SIZE_OVER_SPEED > 1
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+ u_int32_t temp;
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+ const char *ps;
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+
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+ static const char S[] = {
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+ 7, 12, 17, 22,
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+ 5, 9, 14, 20,
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+ 4, 11, 16, 23,
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+ 6, 10, 15, 21
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+ };
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+#endif /* MD5_SIZE_OVER_SPEED > 1 */
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+
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+#if MD5_SIZE_OVER_SPEED > 0
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+ const u_int32_t *pc;
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+ const char *pp;
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int i;
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- static const int S1[] = { 7, 12, 17, 22 };
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- static const u_int32_t C1[] = {
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+ static const u_int32_t C[] = {
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+ /* round 1 */
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0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
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0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
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0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
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- 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821
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- };
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-
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- static const int p2[] = {
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- 1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12
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- };
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- static const int S2[] = { 5, 9, 14, 20 };
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- static const u_int32_t C2[] = {
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+ 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
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+ /* round 2 */
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0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
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0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8,
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0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
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- 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a
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- };
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-
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- static const int p3[] = {
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- 5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2
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- };
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- static const int S3[] = { 4, 11, 16, 23 };
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- static const u_int32_t C3[] = {
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+ 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
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+ /* round 3 */
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0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
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0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
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0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
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- 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665
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- };
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-
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- static const int p4[] = {
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- 0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9
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- };
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- static const int S4[] = { 6, 10, 15, 21 };
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- static const u_int32_t C4[] = {
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+ 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
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+ /* round 4 */
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0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
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0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
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0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
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0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
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};
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+ static const char P[] = {
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+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* 1 */
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+ 1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, /* 2 */
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+ 5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2, /* 3 */
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+ 0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9 /* 4 */
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+ };
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+
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+#endif /* MD5_SIZE_OVER_SPEED > 0 */
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+
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Decode (x, block, 64);
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a = state[0]; b = state[1]; c = state[2]; d = state[3];
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+#if MD5_SIZE_OVER_SPEED > 2
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+ pc = C; pp = P; ps = S - 4;
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+
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+ for ( i = 0 ; i < 64 ; i++ ) {
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+ if ((i&0x0f) == 0) ps += 4;
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+ temp = a;
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+ switch (i>>4) {
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+ case 0:
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+ temp += F(b,c,d);
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+ break;
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+ case 1:
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+ temp += G(b,c,d);
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+ break;
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+ case 2:
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+ temp += H(b,c,d);
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+ break;
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+ case 3:
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+ temp += I(b,c,d);
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+ break;
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+ }
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+ temp += x[(int)(*pp++)] + *pc++;
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+ temp = ROTATE_LEFT(temp, ps[i&3]);
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+ temp += b;
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+ a = d; d = c; c = b; b = temp;
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+ }
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+#elif MD5_SIZE_OVER_SPEED > 1
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+ pc = C; pp = P; ps = S;
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+
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/* Round 1 */
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for ( i = 0 ; i < 16 ; i++ ) {
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- FF (a, b, c, d, x[i], S1[i&3], C1[i]);
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- temp = d; d= c; c = b; b = a; a = temp;
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+ FF (a, b, c, d, x[(int)(*pp++)], ps[i&0x3], *pc++);
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+ temp = d; d = c; c = b; b = a; a = temp;
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}
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/* Round 2 */
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- for ( i = 0 ; i < 16 ; i++ ) {
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- GG (a, b, c, d, x[p2[i]], S2[i&3], C2[i]);
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- temp = d; d= c; c = b; b = a; a = temp;
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+ ps += 4;
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+ for ( ; i < 32 ; i++ ) {
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+ GG (a, b, c, d, x[(int)(*pp++)], ps[i&0x3], *pc++);
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+ temp = d; d = c; c = b; b = a; a = temp;
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}
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/* Round 3 */
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- for ( i = 0 ; i < 16 ; i++ ) {
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- HH (a, b, c, d, x[p3[i]], S3[i&3], C3[i]);
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- temp = d; d= c; c = b; b = a; a = temp;
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+ ps += 4;
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+ for ( ; i < 48 ; i++ ) {
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+ HH (a, b, c, d, x[(int)(*pp++)], ps[i&0x3], *pc++);
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+ temp = d; d = c; c = b; b = a; a = temp;
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}
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/* Round 4 */
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- for ( i = 0 ; i < 16 ; i++ ) {
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- II (a, b, c, d, x[p4[i]], S4[i&3], C4[i]);
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- temp = d; d= c; c = b; b = a; a = temp;
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+ ps += 4;
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+ for ( ; i < 64 ; i++ ) {
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+ II (a, b, c, d, x[(int)(*pp++)], ps[i&0x3], *pc++);
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+ temp = d; d = c; c = b; b = a; a = temp;
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}
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+#elif MD5_SIZE_OVER_SPEED > 0
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+ pc = C; pp = P;
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+
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+ /* Round 1 */
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+ for ( i = 0 ; i < 4 ; i++ ) {
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+ FF (a, b, c, d, x[(int)(*pp++)], 7, *pc++);
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+ FF (d, a, b, c, x[(int)(*pp++)], 12, *pc++);
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+ FF (c, d, a, b, x[(int)(*pp++)], 17, *pc++);
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+ FF (b, c, d, a, x[(int)(*pp++)], 22, *pc++);
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+ }
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+
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+ /* Round 2 */
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+ for ( i = 0 ; i < 4 ; i++ ) {
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+ GG (a, b, c, d, x[(int)(*pp++)], 5, *pc++);
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+ GG (d, a, b, c, x[(int)(*pp++)], 9, *pc++);
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+ GG (c, d, a, b, x[(int)(*pp++)], 14, *pc++);
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+ GG (b, c, d, a, x[(int)(*pp++)], 20, *pc++);
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+ }
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+ /* Round 3 */
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+ for ( i = 0 ; i < 4 ; i++ ) {
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+ HH (a, b, c, d, x[(int)(*pp++)], 4, *pc++);
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+ HH (d, a, b, c, x[(int)(*pp++)], 11, *pc++);
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+ HH (c, d, a, b, x[(int)(*pp++)], 16, *pc++);
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+ HH (b, c, d, a, x[(int)(*pp++)], 23, *pc++);
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+ }
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+
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+ /* Round 4 */
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+ for ( i = 0 ; i < 4 ; i++ ) {
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+ II (a, b, c, d, x[(int)(*pp++)], 6, *pc++);
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+ II (d, a, b, c, x[(int)(*pp++)], 10, *pc++);
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+ II (c, d, a, b, x[(int)(*pp++)], 15, *pc++);
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+ II (b, c, d, a, x[(int)(*pp++)], 21, *pc++);
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+ }
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+#else
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+ /* Round 1 */
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+#define S11 7
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+#define S12 12
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+#define S13 17
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+#define S14 22
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+ FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
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+ FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
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+ FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
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+ FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
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+ FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
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+ FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
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+ FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
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+ FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
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+ FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
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+ FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
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+ FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
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+ FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
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+ FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
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+ FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
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+ FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
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+ FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
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+
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+ /* Round 2 */
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+#define S21 5
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+#define S22 9
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+#define S23 14
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+#define S24 20
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+ GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
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+ GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
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+ GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
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+ GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
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+ GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
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+ GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
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+ GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
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+ GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
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+ GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
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+ GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
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+ GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
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+ GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
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+ GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
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+ GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
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+ GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
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+ GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
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+
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+ /* Round 3 */
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+#define S31 4
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+#define S32 11
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+#define S33 16
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+#define S34 23
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+ HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
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+ HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
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+ HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
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+ HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
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+ HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
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+ HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
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+ HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
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+ HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
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+ HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
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+ HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
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+ HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
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+ HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
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+ HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
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+ HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
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+ HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
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+ HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
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+
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+ /* Round 4 */
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+#define S41 6
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+#define S42 10
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+#define S43 15
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+#define S44 21
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+ II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
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+ II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
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+ II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
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+ II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
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+ II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
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+ II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
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+ II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
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+ II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
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+ II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
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+ II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
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+ II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
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+ II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
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+ II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
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+ II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
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+ II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
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+ II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
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+#endif
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state[0] += a;
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state[1] += b;
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