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+// $Id: md5calc.c,v 1.1.1.1 2004/09/10 17:26:54 MagicalTux Exp $
+/***********************************************************
+ * md5 calculation algorithm
+ *
+ * The source code referred to the following URL.
+ * http://www.geocities.co.jp/SiliconValley-Oakland/8878/lab17/lab17.html
+ *
+ ***********************************************************/
+
+#include "md5calc.h"
+#include <string.h>
+#include <stdio.h>
+#include "mt_rand.h"
+
+#ifndef UINT_MAX
+#define UINT_MAX 4294967295U
+#endif
+
+// Global variable
+static unsigned int *pX;
+
+// Stirng Table
+static const unsigned int T[] = {
+ 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, //0
+ 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, //4
+ 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, //8
+ 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, //12
+ 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, //16
+ 0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8, //20
+ 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, //24
+ 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, //28
+ 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, //32
+ 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, //36
+ 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05, //40
+ 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, //44
+ 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, //48
+ 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, //52
+ 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, //56
+ 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 //60
+};
+
+// ROTATE_LEFT The left is made to rotate x [ n-bit ]. This is diverted as it is from RFC.
+#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
+
+// The function used for other calculation
+static unsigned int F (unsigned int X, unsigned int Y, unsigned int Z)
+{
+ return (X & Y) | (~X & Z);
+}
+
+static unsigned int G (unsigned int X, unsigned int Y, unsigned int Z)
+{
+ return (X & Z) | (Y & ~Z);
+}
+
+static unsigned int H (unsigned int X, unsigned int Y, unsigned int Z)
+{
+ return X ^ Y ^ Z;
+}
+
+static unsigned int I (unsigned int X, unsigned int Y, unsigned int Z)
+{
+ return Y ^ (X | ~Z);
+}
+
+static unsigned int Round (unsigned int a, unsigned int b, unsigned int FGHI,
+ unsigned int k, unsigned int s, unsigned int i)
+{
+ return b + ROTATE_LEFT (a + FGHI + pX[k] + T[i], s);
+}
+
+static void Round1 (unsigned int *a, unsigned int b, unsigned int c,
+ unsigned int d, unsigned int k, unsigned int s,
+ unsigned int i)
+{
+ *a = Round (*a, b, F (b, c, d), k, s, i);
+}
+
+static void Round2 (unsigned int *a, unsigned int b, unsigned int c,
+ unsigned int d, unsigned int k, unsigned int s,
+ unsigned int i)
+{
+ *a = Round (*a, b, G (b, c, d), k, s, i);
+}
+
+static void Round3 (unsigned int *a, unsigned int b, unsigned int c,
+ unsigned int d, unsigned int k, unsigned int s,
+ unsigned int i)
+{
+ *a = Round (*a, b, H (b, c, d), k, s, i);
+}
+
+static void Round4 (unsigned int *a, unsigned int b, unsigned int c,
+ unsigned int d, unsigned int k, unsigned int s,
+ unsigned int i)
+{
+ *a = Round (*a, b, I (b, c, d), k, s, i);
+}
+
+static void MD5_Round_Calculate (const unsigned char *block,
+ unsigned int *A2, unsigned int *B2,
+ unsigned int *C2, unsigned int *D2)
+{
+ //create X It is since it is required.
+ unsigned int X[16]; //512bit 64byte
+ int j, k;
+
+ //Save A as AA, B as BB, C as CC, and and D as DD (saving of A, B, C, and D)
+ unsigned int A = *A2, B = *B2, C = *C2, D = *D2;
+ unsigned int AA = A, BB = B, CC = C, DD = D;
+
+ //It is a large region variable reluctantly because of calculation of a round. . . for Round1...4
+ pX = X;
+
+ //Copy block(padding_message) i into X
+ for (j = 0, k = 0; j < 64; j += 4, k++)
+ X[k] = ((unsigned int) block[j]) // 8byte*4 -> 32byte conversion
+ | (((unsigned int) block[j + 1]) << 8) // A function called Decode as used in the field of RFC
+ | (((unsigned int) block[j + 2]) << 16)
+ | (((unsigned int) block[j + 3]) << 24);
+
+ //Round 1
+ Round1 (&A, B, C, D, 0, 7, 0);
+ Round1 (&D, A, B, C, 1, 12, 1);
+ Round1 (&C, D, A, B, 2, 17, 2);
+ Round1 (&B, C, D, A, 3, 22, 3);
+ Round1 (&A, B, C, D, 4, 7, 4);
+ Round1 (&D, A, B, C, 5, 12, 5);
+ Round1 (&C, D, A, B, 6, 17, 6);
+ Round1 (&B, C, D, A, 7, 22, 7);
+ Round1 (&A, B, C, D, 8, 7, 8);
+ Round1 (&D, A, B, C, 9, 12, 9);
+ Round1 (&C, D, A, B, 10, 17, 10);
+ Round1 (&B, C, D, A, 11, 22, 11);
+ Round1 (&A, B, C, D, 12, 7, 12);
+ Round1 (&D, A, B, C, 13, 12, 13);
+ Round1 (&C, D, A, B, 14, 17, 14);
+ Round1 (&B, C, D, A, 15, 22, 15);
+
+ //Round 2
+ Round2 (&A, B, C, D, 1, 5, 16);
+ Round2 (&D, A, B, C, 6, 9, 17);
+ Round2 (&C, D, A, B, 11, 14, 18);
+ Round2 (&B, C, D, A, 0, 20, 19);
+ Round2 (&A, B, C, D, 5, 5, 20);
+ Round2 (&D, A, B, C, 10, 9, 21);
+ Round2 (&C, D, A, B, 15, 14, 22);
+ Round2 (&B, C, D, A, 4, 20, 23);
+ Round2 (&A, B, C, D, 9, 5, 24);
+ Round2 (&D, A, B, C, 14, 9, 25);
+ Round2 (&C, D, A, B, 3, 14, 26);
+ Round2 (&B, C, D, A, 8, 20, 27);
+ Round2 (&A, B, C, D, 13, 5, 28);
+ Round2 (&D, A, B, C, 2, 9, 29);
+ Round2 (&C, D, A, B, 7, 14, 30);
+ Round2 (&B, C, D, A, 12, 20, 31);
+
+ //Round 3
+ Round3 (&A, B, C, D, 5, 4, 32);
+ Round3 (&D, A, B, C, 8, 11, 33);
+ Round3 (&C, D, A, B, 11, 16, 34);
+ Round3 (&B, C, D, A, 14, 23, 35);
+ Round3 (&A, B, C, D, 1, 4, 36);
+ Round3 (&D, A, B, C, 4, 11, 37);
+ Round3 (&C, D, A, B, 7, 16, 38);
+ Round3 (&B, C, D, A, 10, 23, 39);
+ Round3 (&A, B, C, D, 13, 4, 40);
+ Round3 (&D, A, B, C, 0, 11, 41);
+ Round3 (&C, D, A, B, 3, 16, 42);
+ Round3 (&B, C, D, A, 6, 23, 43);
+ Round3 (&A, B, C, D, 9, 4, 44);
+ Round3 (&D, A, B, C, 12, 11, 45);
+ Round3 (&C, D, A, B, 15, 16, 46);
+ Round3 (&B, C, D, A, 2, 23, 47);
+
+ //Round 4
+ Round4 (&A, B, C, D, 0, 6, 48);
+ Round4 (&D, A, B, C, 7, 10, 49);
+ Round4 (&C, D, A, B, 14, 15, 50);
+ Round4 (&B, C, D, A, 5, 21, 51);
+ Round4 (&A, B, C, D, 12, 6, 52);
+ Round4 (&D, A, B, C, 3, 10, 53);
+ Round4 (&C, D, A, B, 10, 15, 54);
+ Round4 (&B, C, D, A, 1, 21, 55);
+ Round4 (&A, B, C, D, 8, 6, 56);
+ Round4 (&D, A, B, C, 15, 10, 57);
+ Round4 (&C, D, A, B, 6, 15, 58);
+ Round4 (&B, C, D, A, 13, 21, 59);
+ Round4 (&A, B, C, D, 4, 6, 60);
+ Round4 (&D, A, B, C, 11, 10, 61);
+ Round4 (&C, D, A, B, 2, 15, 62);
+ Round4 (&B, C, D, A, 9, 21, 63);
+
+ // Then perform the following additions. (let's add)
+ *A2 = A + AA;
+ *B2 = B + BB;
+ *C2 = C + CC;
+ *D2 = D + DD;
+
+ //The clearance of confidential information
+ memset (pX, 0, sizeof (X));
+}
+
+//-------------------------------------------------------------------
+// The function for the exteriors
+
+/** output is the coded binary in the character sequence which wants to code string. */
+void MD5_String2binary (const char *string, char *output)
+{
+ if (!output)
+ return;
+ if (!string)
+ {
+ *output=0;
+ return;
+ }
+//var
+ /*8bit */
+ unsigned char padding_message[64]; //Extended message 512bit 64byte
+ unsigned char *pstring; //The position of string in the present scanning notes is held.
+
+// unsigned char digest[16];
+ /*32bit */
+ unsigned int string_byte_len, //The byte chief of string is held.
+ string_bit_len, //The bit length of string is held.
+ copy_len, //The number of bytes which is used by 1-3 and which remained
+ msg_digest[4]; //Message digest 128bit 4byte
+ unsigned int *A = &msg_digest[0], //The message digest in accordance with RFC (reference)
+ *B = &msg_digest[1], *C = &msg_digest[2], *D = &msg_digest[3];
+ int i;
+
+//prog
+ //Step 3.Initialize MD Buffer (although it is the initialization; step 3 of A, B, C, and D -- unavoidable -- a head)
+ *A = 0x67452301;
+ *B = 0xefcdab89;
+ *C = 0x98badcfe;
+ *D = 0x10325476;
+
+ //Step 1.Append Padding Bits (extension of a mark bit)
+ //1-1
+ string_byte_len = strlen (string); //The byte chief of a character sequence is acquired.
+ pstring = (unsigned char *) string; //The position of the present character sequence is set.
+
+ //1-2 Repeat calculation until length becomes less than 64 bytes.
+ for (i = string_byte_len; 64 <= i; i -= 64, pstring += 64)
+ MD5_Round_Calculate (pstring, A, B, C, D);
+
+ //1-3
+ copy_len = string_byte_len % 64; //The number of bytes which remained is computed.
+ strncpy ((char *) padding_message, (char *) pstring, copy_len); //A message is copied to an extended bit sequence.
+ memset (padding_message + copy_len, 0, 64 - copy_len); //It buries by 0 until it becomes extended bit length.
+ padding_message[copy_len] |= 0x80; //The next of a message is 1.
+
+ //1-4
+ //If 56 bytes or more (less than 64 bytes) of remainder becomes, it will calculate by extending to 64 bytes.
+ if (56 <= copy_len)
+ {
+ MD5_Round_Calculate (padding_message, A, B, C, D);
+ memset (padding_message, 0, 56); //56 bytes is newly fill uped with 0.
+ }
+
+ //Step 2.Append Length (the information on length is added)
+ string_bit_len = string_byte_len * 8; //From the byte chief to bit length (32 bytes of low rank)
+ memcpy (&padding_message[56], &string_bit_len, 4); //32 bytes of low rank is set.
+
+ //When bit length cannot be expressed in 32 bytes of low rank, it is a beam raising to a higher rank.
+ if (UINT_MAX / 8 < string_byte_len)
+ {
+ unsigned int high = (string_byte_len - UINT_MAX / 8) * 8;
+ memcpy (&padding_message[60], &high, 4);
+ }
+ else
+ memset (&padding_message[60], 0, 4); //In this case, it is good for a higher rank at 0.
+
+ //Step 4.Process Message in 16-Word Blocks (calculation of MD5)
+ MD5_Round_Calculate (padding_message, A, B, C, D);
+
+ //Step 5.Output (output)
+ memcpy (output, msg_digest, 16);
+// memcpy (digest, msg_digest, and 16); //8 byte*4 < - 32byte conversion A function called Encode as used in the field of RFC
+/* sprintf(output,
+ "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
+ digest[ 0], digest[ 1], digest[ 2], digest[ 3],
+ digest[ 4], digest[ 5], digest[ 6], digest[ 7],
+ digest[ 8], digest[ 9], digest[10], digest[11],
+ digest[12], digest[13], digest[14], digest[15]);*/
+}
+
+/** output is the coded character sequence in the character sequence which wants to code string. */
+void MD5_String (const char *string, char *output)
+{
+ if (!output)
+ return;
+ if (!string)
+ {
+ *output=0;
+ return;
+ }
+ unsigned char digest[16];
+
+ MD5_String2binary (string, (char *)digest);
+ sprintf (output,
+ "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
+ digest[0], digest[1], digest[2], digest[3],
+ digest[4], digest[5], digest[6], digest[7],
+ digest[8], digest[9], digest[10], digest[11],
+ digest[12], digest[13], digest[14], digest[15]);
+}
+
+// Hash a password with a salt.
+char *MD5_saltcrypt(const char *key, const char *salt)
+{
+ if (!salt)
+ return 0;
+
+ char buf[66], *sbuf = buf+32;
+ static char obuf[33];
+
+ // hash the key then the salt
+ // buf ends up as a 64char null terminated string
+ MD5_String(key, buf);
+ MD5_String(salt, sbuf);
+
+ // Hash the buffer back into sbuf
+ MD5_String(buf, sbuf);
+
+ snprintf(obuf, 32, "!%s$%s", salt, sbuf);
+ return(obuf);
+}
+
+char *make_salt(void)
+{
+ static char salt[6];
+ int i;
+ for (i=0; i<5; i++)
+ salt[i] = (char)((mt_rand() % 78) + 48);
+ salt[5] = '\0';
+ return(salt);
+}
+
+int pass_ok(const char *password, const char *crypted)
+{
+ if (!password || !crypted)
+ return 0;
+
+ char buf[40], *salt=buf+1;
+
+ strncpy(buf, crypted, 40);
+ buf[39] = 0;
+ char *ptr = strchr(buf, '$');
+ if (ptr)
+ {
+ *ptr = '\0';
+
+ if (!strcmp(crypted, MD5_saltcrypt(password, salt)))
+ return(1);
+ }
+ else
+ {
+ //++ may be here need compare non encripted passwords?
+// if (!strcmp(crypted, password))
+// return(1);
+ }
+
+ return(0);
+}
+
+// [M|h]ashes up an IP address and a secret key
+// to return a hopefully unique masked IP.
+in_addr_t MD5_ip(char *secret, in_addr_t ip)
+{
+ char ipbuf[32];
+ char obuf[16];
+ union {
+ struct bytes {
+ unsigned char b1;
+ unsigned char b2;
+ unsigned char b3;
+ unsigned char b4;
+ } bytes;
+ in_addr_t ip;
+ } conv;
+
+ if (!secret)
+ {
+ conv.bytes.b1 = 0;
+ conv.bytes.b2 = 0;
+ conv.bytes.b3 = 0;
+ conv.bytes.b4 = 0;
+ return conv.ip;
+ }
+
+ // MD5sum a secret + the IP address
+ memset(&ipbuf, 0, sizeof(ipbuf));
+ snprintf(ipbuf, sizeof(ipbuf), "%lu%s", (unsigned long)ip, secret);
+ MD5_String2binary(ipbuf, obuf);
+
+ // Fold the md5sum to 32 bits, pack the bytes to an in_addr_t
+ conv.bytes.b1 = obuf[0] ^ obuf[1] ^ obuf[8] ^ obuf[9];
+ conv.bytes.b2 = obuf[2] ^ obuf[3] ^ obuf[10] ^ obuf[11];
+ conv.bytes.b3 = obuf[4] ^ obuf[5] ^ obuf[12] ^ obuf[13];
+ conv.bytes.b4 = obuf[6] ^ obuf[7] ^ obuf[14] ^ obuf[15];
+
+ return conv.ip;
+}
+
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