+
−/* 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.
+
− */
+
−#include "tomcrypt.h"
+
−
+
−/**
+
−   @param md2.c
+
−   LTC_MD2 (RFC 1319) hash function implementation by Tom St Denis
+
−*/
+
−
+
−#ifdef LTC_MD2
+
−
+
−const struct ltc_hash_descriptor md2_desc =
+
−{
+
−    "md2",
+
−    7,
+
−    16,
+
−    16,
+
−
+
−    /* OID */
+
−   { 1, 2, 840, 113549, 2, 2,  },
+
−   6,
+
−
+
−    &md2_init,
+
−    &md2_process,
+
−    &md2_done,
+
−    &md2_test,
+
−    NULL
+
−};
+
−
+
−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;
+
−   }
+
−}
+
−
+
−/**
+
−   Initialize the hash state
+
−   @param md   The hash state you wish to initialize
+
−   @return CRYPT_OK if successful
+
−*/
+
−int md2_init(hash_state *md)
+
−{
+
−   LTC_ARGCHK(md != NULL);
+
−
+
−   /* LTC_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;
+
−   return CRYPT_OK;
+
−}
+
−
+
−/**
+
−   Process a block of memory though the hash
+
−   @param md     The hash state
+
−   @param in     The data to hash
+
−   @param inlen  The length of the data (octets)
+
−   @return CRYPT_OK if successful
+
−*/
+
−int md2_process(hash_state *md, const unsigned char *in, unsigned long inlen)
+
−{
+
−    unsigned long n;
+
−    LTC_ARGCHK(md != NULL);
+
−    LTC_ARGCHK(in != NULL);
+
−    if (md-> md2 .curlen > sizeof(md-> md2 .buf)) {
+
−       return CRYPT_INVALID_ARG;
+
−    }
+
−    while (inlen > 0) {
+
−        n = MIN(inlen, (16 - md->md2.curlen));
+
−        XMEMCPY(md->md2.buf + md->md2.curlen, in, (size_t)n);
+
−        md->md2.curlen += n;
+
−        in             += n;
+
−        inlen          -= n;
+
−
+
−        /* is 16 bytes full? */
+
−        if (md->md2.curlen == 16) {
+
−            md2_compress(md);
+
−            md2_update_chksum(md);
+
−            md->md2.curlen = 0;
+
−        }
+
−    }
+
−    return CRYPT_OK;
+
−}
+
−
+
−/**
+
−   Terminate the hash to get the digest
+
−   @param md  The hash state
+
−   @param out [out] The destination of the hash (16 bytes)
+
−   @return CRYPT_OK if successful
+
−*/
+
−int md2_done(hash_state * md, unsigned char *out)
+
−{
+
−    unsigned long i, k;
+
−
+
−    LTC_ARGCHK(md  != NULL);
+
−    LTC_ARGCHK(out != 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 */
+
−    XMEMCPY(md->md2.buf, md->md2.chksum, 16);
+
−    md2_compress(md);
+
−
+
−    /* output is lower 16 bytes of X */
+
−    XMEMCPY(out, md->md2.X, 16);
+
−
+
−#ifdef LTC_CLEAN_STACK
+
−    zeromem(md, sizeof(hash_state));
+
−#endif
+
−    return CRYPT_OK;
+
−}
+
−
+
−/**
+
−  Self-test the hash
+
−  @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled
+
−*/
+
−int md2_test(void)
+
−{
+
− #ifndef LTC_TEST
+
−    return CRYPT_NOP;
+
− #else
+
−   static const struct {
+
−        const char *msg;
+
−        unsigned char hash[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;
+
−   unsigned char tmp[16];
+
−   hash_state md;
+
−
+
−   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, tmp);
+
−       if (compare_testvector(tmp, sizeof(tmp), tests[i].hash, sizeof(tests[i].hash), "MD2", i)) {
+
−          return CRYPT_FAIL_TESTVECTOR;
+
−       }
+
−   }
+
−   return CRYPT_OK;
+
−  #endif
+
−}
+
−
+
−#endif
+
−
+
−
+
−/* ref:         $Format:%D$ */
+
−/* git commit:  $Format:%H$ */
+
−/* commit time: $Format:%ai$ */