--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/md2.c	Mon May 31 18:21:40 2004 +0000
@@ -0,0 +1,214 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, [email protected], http://libtomcrypt.org
+ */
+/* MD2 (RFC 1319) hash function implementation by Tom St Denis */
+#include "mycrypt.h"
+
+#ifdef MD2
+
+const struct _hash_descriptor md2_desc =
+{
+    "md2",
+    7,
+    16,
+    16,
+    &md2_init,
+    &md2_process,
+    &md2_done,
+    &md2_test
+};
+
+static const unsigned char PI_SUBST[256] = {
+  41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
+  19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
+  76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
+  138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
+  245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
+  148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
+  39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
+  181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
+  150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
+  112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
+  96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
+  85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
+  234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
+  129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
+  8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
+  203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
+  166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
+  31, 26, 219, 153, 141, 51, 159, 17, 131, 20
+};
+
+/* adds 16 bytes to the checksum */
+static void md2_update_chksum(hash_state *md)
+{
+   int j;
+   unsigned char L;
+   L = md->md2.chksum[15];
+   for (j = 0; j < 16; j++) {
+
+/* caution, the RFC says its "C[j] = S[M[i*16+j] xor L]" but the reference source code [and test vectors] say 
+   otherwise.
+*/
+       L = (md->md2.chksum[j] ^= PI_SUBST[(int)(md->md2.buf[j] ^ L)] & 255);
+   }
+}
+
+static void md2_compress(hash_state *md)
+{
+   int j, k;
+   unsigned char t;
+   
+   /* copy block */
+   for (j = 0; j < 16; j++) {
+       md->md2.X[16+j] = md->md2.buf[j];
+       md->md2.X[32+j] = md->md2.X[j] ^ md->md2.X[16+j];
+   }
+
+   t = (unsigned char)0;
+
+   /* do 18 rounds */
+   for (j = 0; j < 18; j++) {
+       for (k = 0; k < 48; k++) {
+           t = (md->md2.X[k] ^= PI_SUBST[(int)(t & 255)]);
+       }
+       t = (t + (unsigned char)j) & 255;
+   }
+}
+
+void md2_init(hash_state *md)
+{
+   _ARGCHK(md != NULL);
+
+   /* MD2 uses a zero'ed state... */
+   zeromem(md->md2.X, sizeof(md->md2.X));
+   zeromem(md->md2.chksum, sizeof(md->md2.chksum));
+   zeromem(md->md2.buf, sizeof(md->md2.buf));
+   md->md2.curlen = 0;
+}
+
+int md2_process(hash_state *md, const unsigned char *buf, unsigned long len)
+{
+    unsigned long n;
+    _ARGCHK(md != NULL);
+    _ARGCHK(buf != NULL);
+    if (md-> md2 .curlen > sizeof(md-> md2 .buf)) {                            
+       return CRYPT_INVALID_ARG;                                                           
+    }                                                                                       
+    while (len > 0) {
+        n = MIN(len, (16 - md->md2.curlen));
+        memcpy(md->md2.buf + md->md2.curlen, buf, (size_t)n);
+        md->md2.curlen += n;
+        buf            += n;
+        len            -= n;
+
+        /* is 16 bytes full? */
+        if (md->md2.curlen == 16) {
+            md2_compress(md);
+            md2_update_chksum(md);
+            md->md2.curlen = 0;
+        }
+    }
+    return CRYPT_OK;
+}
+
+int md2_done(hash_state * md, unsigned char *hash)
+{
+    unsigned long i, k;
+
+    _ARGCHK(md != NULL);
+    _ARGCHK(hash != NULL);
+
+    if (md->md2.curlen >= sizeof(md->md2.buf)) {
+       return CRYPT_INVALID_ARG;
+    }
+
+
+    /* pad the message */
+    k = 16 - md->md2.curlen;
+    for (i = md->md2.curlen; i < 16; i++) {
+        md->md2.buf[i] = (unsigned char)k;
+    }
+
+    /* hash and update */
+    md2_compress(md);
+    md2_update_chksum(md);
+
+    /* hash checksum */
+    memcpy(md->md2.buf, md->md2.chksum, 16);
+    md2_compress(md);
+
+    /* output is lower 16 bytes of X */
+    memcpy(hash, md->md2.X, 16);
+
+#ifdef CLEAN_STACK
+    zeromem(md, sizeof(hash_state));
+#endif
+    return CRYPT_OK;
+}
+
+int md2_test(void)
+{
+ #ifndef LTC_TEST
+    return CRYPT_NOP;
+ #else    
+   static const struct {
+        char *msg;
+        unsigned char md[16];
+   } tests[] = {
+      { "",
+        {0x83,0x50,0xe5,0xa3,0xe2,0x4c,0x15,0x3d,
+         0xf2,0x27,0x5c,0x9f,0x80,0x69,0x27,0x73
+        }
+      },
+      { "a",
+        {0x32,0xec,0x01,0xec,0x4a,0x6d,0xac,0x72,
+         0xc0,0xab,0x96,0xfb,0x34,0xc0,0xb5,0xd1
+        }
+      },
+      { "message digest",
+        {0xab,0x4f,0x49,0x6b,0xfb,0x2a,0x53,0x0b,
+         0x21,0x9f,0xf3,0x30,0x31,0xfe,0x06,0xb0
+        }
+      },
+      { "abcdefghijklmnopqrstuvwxyz",
+        {0x4e,0x8d,0xdf,0xf3,0x65,0x02,0x92,0xab,
+         0x5a,0x41,0x08,0xc3,0xaa,0x47,0x94,0x0b
+        }
+      },
+      { "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
+        {0xda,0x33,0xde,0xf2,0xa4,0x2d,0xf1,0x39,
+         0x75,0x35,0x28,0x46,0xc3,0x03,0x38,0xcd
+        }
+      },
+      { "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
+        {0xd5,0x97,0x6f,0x79,0xd8,0x3d,0x3a,0x0d,
+         0xc9,0x80,0x6c,0x3c,0x66,0xf3,0xef,0xd8
+        }
+      }
+   };
+   int i;
+   hash_state md;
+   unsigned char buf[16];
+
+   for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
+       md2_init(&md);
+       md2_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg));
+       md2_done(&md, buf);
+       if (memcmp(buf, tests[i].md, 16) != 0) {
+          return CRYPT_FAIL_TESTVECTOR;
+       }
+   }
+   return CRYPT_OK;        
+  #endif
+}
+
+#endif
+