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view libtomcrypt/src/encauth/ocb3/ocb3_test.c @ 1790:42745af83b7d

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Introduce extra delay before closing unauthenticated sessions To make it harder for attackers, introduce a delay to keep an unauthenticated session open a bit longer, thus blocking a connection slot until after the delay. Without this, while there is a limit on the amount of attempts an attacker can make at the same time (MAX_UNAUTH_PER_IP), the time taken by dropbear to handle one attempt is still short and thus for each of the allowed parallel attempts many attempts can be chained one after the other. The attempt rate is then: "MAX_UNAUTH_PER_IP / <process time of one attempt>". With the delay, this rate becomes: "MAX_UNAUTH_PER_IP / UNAUTH_CLOSE_DELAY".
author Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
date Wed, 15 Feb 2017 13:53:04 +0100
parents 6dba84798cd5
children
line wrap: on
line source

/* 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.
 */

/**
   @file ocb3_test.c
   OCB implementation, self-test by Tom St Denis
*/
#include "tomcrypt.h"

#ifdef LTC_OCB3_MODE

/**
   Test the OCB protocol
   @return CRYPT_OK if successful
*/
int ocb3_test(void)
{
#ifndef LTC_TEST
   return CRYPT_NOP;
#else
   /* test vectors from: http://tools.ietf.org/html/draft-krovetz-ocb-03 */
   unsigned char key[16]   = { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F };
   unsigned char nonce[12] = { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B };
   const struct {
         int ptlen;
         int aadlen;
         unsigned char pt[64], aad[64], ct[64], tag[16];
   } tests[] = {

   { /* index:0 */
     0, /* PLAINTEXT length */
     0, /* AAD length */
     { 0 }, /* PLAINTEXT */
     { 0 }, /* AAD */
     { 0 }, /* CIPHERTEXT */
     { 0x19,0x7b,0x9c,0x3c,0x44,0x1d,0x3c,0x83,0xea,0xfb,0x2b,0xef,0x63,0x3b,0x91,0x82 }, /* TAG */
   },
   { /* index:1 */
     8, /* PLAINTEXT length */
     8, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07 }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07 }, /* AAD */
     { 0x92,0xb6,0x57,0x13,0x0a,0x74,0xb8,0x5a }, /* CIPHERTEXT */
     { 0x16,0xdc,0x76,0xa4,0x6d,0x47,0xe1,0xea,0xd5,0x37,0x20,0x9e,0x8a,0x96,0xd1,0x4e }, /* TAG */
   },
   { /* index:2 */
     0, /* PLAINTEXT length */
     8, /* AAD length */
     { 0 }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07 }, /* AAD */
     { 0 }, /* CIPHERTEXT */
     { 0x98,0xb9,0x15,0x52,0xc8,0xc0,0x09,0x18,0x50,0x44,0xe3,0x0a,0x6e,0xb2,0xfe,0x21 }, /* TAG */
   },
   { /* index:3 */
     8, /* PLAINTEXT length */
     0, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07 }, /* PLAINTEXT */
     { 0 }, /* AAD */
     { 0x92,0xb6,0x57,0x13,0x0a,0x74,0xb8,0x5a }, /* CIPHERTEXT */
     { 0x97,0x1e,0xff,0xca,0xe1,0x9a,0xd4,0x71,0x6f,0x88,0xe8,0x7b,0x87,0x1f,0xbe,0xed }, /* TAG */
   },
   { /* index:4 */
     16, /* PLAINTEXT length */
     16, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f }, /* AAD */
     { 0xbe,0xa5,0xe8,0x79,0x8d,0xbe,0x71,0x10,0x03,0x1c,0x14,0x4d,0xa0,0xb2,0x61,0x22 }, /* CIPHERTEXT */
     { 0x77,0x6c,0x99,0x24,0xd6,0x72,0x3a,0x1f,0xc4,0x52,0x45,0x32,0xac,0x3e,0x5b,0xeb }, /* TAG */
   },
   { /* index:5 */
     0, /* PLAINTEXT length */
     16, /* AAD length */
     { 0 }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f }, /* AAD */
     { 0 }, /* CIPHERTEXT */
     { 0x7d,0xdb,0x8e,0x6c,0xea,0x68,0x14,0x86,0x62,0x12,0x50,0x96,0x19,0xb1,0x9c,0xc6 }, /* TAG */
   },
   { /* index:6 */
     16, /* PLAINTEXT length */
     0, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f }, /* PLAINTEXT */
     { 0 }, /* AAD */
     { 0xbe,0xa5,0xe8,0x79,0x8d,0xbe,0x71,0x10,0x03,0x1c,0x14,0x4d,0xa0,0xb2,0x61,0x22 }, /* CIPHERTEXT */
     { 0x13,0xcc,0x8b,0x74,0x78,0x07,0x12,0x1a,0x4c,0xbb,0x3e,0x4b,0xd6,0xb4,0x56,0xaf }, /* TAG */
   },
   { /* index:7 */
     24, /* PLAINTEXT length */
     24, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17 }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17 }, /* AAD */
     { 0xbe,0xa5,0xe8,0x79,0x8d,0xbe,0x71,0x10,0x03,0x1c,0x14,0x4d,0xa0,0xb2,0x61,0x22,0xfc,0xfc,0xee,0x7a,0x2a,0x8d,0x4d,0x48 }, /* CIPHERTEXT */
     { 0x5f,0xa9,0x4f,0xc3,0xf3,0x88,0x20,0xf1,0xdc,0x3f,0x3d,0x1f,0xd4,0xe5,0x5e,0x1c }, /* TAG */
   },
   { /* index:8 */
     0, /* PLAINTEXT length */
     24, /* AAD length */
     { 0 }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17 }, /* AAD */
     { 0 }, /* CIPHERTEXT */
     { 0x28,0x20,0x26,0xda,0x30,0x68,0xbc,0x9f,0xa1,0x18,0x68,0x1d,0x55,0x9f,0x10,0xf6 }, /* TAG */
   },
   { /* index:9 */
     24, /* PLAINTEXT length */
     0, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17 }, /* PLAINTEXT */
     { 0 }, /* AAD */
     { 0xbe,0xa5,0xe8,0x79,0x8d,0xbe,0x71,0x10,0x03,0x1c,0x14,0x4d,0xa0,0xb2,0x61,0x22,0xfc,0xfc,0xee,0x7a,0x2a,0x8d,0x4d,0x48 }, /* CIPHERTEXT */
     { 0x6e,0xf2,0xf5,0x25,0x87,0xfd,0xa0,0xed,0x97,0xdc,0x7e,0xed,0xe2,0x41,0xdf,0x68 }, /* TAG */
   },
   { /* index:10 */
     32, /* PLAINTEXT length */
     32, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f }, /* AAD */
     { 0xbe,0xa5,0xe8,0x79,0x8d,0xbe,0x71,0x10,0x03,0x1c,0x14,0x4d,0xa0,0xb2,0x61,0x22,0xce,0xaa,0xb9,0xb0,0x5d,0xf7,0x71,0xa6,0x57,0x14,0x9d,0x53,0x77,0x34,0x63,0xcb }, /* CIPHERTEXT */
     { 0xb2,0xa0,0x40,0xdd,0x3b,0xd5,0x16,0x43,0x72,0xd7,0x6d,0x7b,0xb6,0x82,0x42,0x40 }, /* TAG */
   },
   { /* index:11 */
     0, /* PLAINTEXT length */
     32, /* AAD length */
     { 0 }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f }, /* AAD */
     { 0 }, /* CIPHERTEXT */
     { 0xe1,0xe0,0x72,0x63,0x3b,0xad,0xe5,0x1a,0x60,0xe8,0x59,0x51,0xd9,0xc4,0x2a,0x1b }, /* TAG */
   },
   { /* index:12 */
     32, /* PLAINTEXT length */
     0, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f }, /* PLAINTEXT */
     { 0 }, /* AAD */
     { 0xbe,0xa5,0xe8,0x79,0x8d,0xbe,0x71,0x10,0x03,0x1c,0x14,0x4d,0xa0,0xb2,0x61,0x22,0xce,0xaa,0xb9,0xb0,0x5d,0xf7,0x71,0xa6,0x57,0x14,0x9d,0x53,0x77,0x34,0x63,0xcb }, /* CIPHERTEXT */
     { 0x4a,0x3b,0xae,0x82,0x44,0x65,0xcf,0xda,0xf8,0xc4,0x1f,0xc5,0x0c,0x7d,0xf9,0xd9 }, /* TAG */
   },
   { /* index:13 */
     40, /* PLAINTEXT length */
     40, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27 }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27 }, /* AAD */
     { 0xbe,0xa5,0xe8,0x79,0x8d,0xbe,0x71,0x10,0x03,0x1c,0x14,0x4d,0xa0,0xb2,0x61,0x22,0xce,0xaa,0xb9,0xb0,0x5d,0xf7,0x71,0xa6,0x57,0x14,0x9d,0x53,0x77,0x34,0x63,0xcb,0x68,0xc6,0x57,0x78,0xb0,0x58,0xa6,0x35 }, /* CIPHERTEXT */
     { 0x65,0x9c,0x62,0x32,0x11,0xde,0xea,0x0d,0xe3,0x0d,0x2c,0x38,0x18,0x79,0xf4,0xc8 }, /* TAG */
   },
   { /* index:14 */
     0, /* PLAINTEXT length */
     40, /* AAD length */
     { 0 }, /* PLAINTEXT */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27 }, /* AAD */
     { 0 }, /* CIPHERTEXT */
     { 0x7a,0xeb,0x7a,0x69,0xa1,0x68,0x7d,0xd0,0x82,0xca,0x27,0xb0,0xd9,0xa3,0x70,0x96 }, /* TAG */
   },
   { /* index:15 */
     40, /* PLAINTEXT length */
     0, /* AAD length */
     { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1a,0x1b,0x1c,0x1d,0x1e,0x1f,0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27 }, /* PLAINTEXT */
     { 0 }, /* AAD */
     { 0xbe,0xa5,0xe8,0x79,0x8d,0xbe,0x71,0x10,0x03,0x1c,0x14,0x4d,0xa0,0xb2,0x61,0x22,0xce,0xaa,0xb9,0xb0,0x5d,0xf7,0x71,0xa6,0x57,0x14,0x9d,0x53,0x77,0x34,0x63,0xcb,0x68,0xc6,0x57,0x78,0xb0,0x58,0xa6,0x35 }, /* CIPHERTEXT */
     { 0x06,0x0c,0x84,0x67,0xf4,0xab,0xab,0x5e,0x8b,0x3c,0x20,0x67,0xa2,0xe1,0x15,0xdc }, /* TAG */
   },

};
   /* As of RFC 7253 - 'Appendix A.  Sample Results'
    *    The next tuple shows a result with a tag length of 96 bits and a
   different key.

     K: 0F0E0D0C0B0A09080706050403020100

     N: BBAA9988776655443322110D
     A: 000102030405060708090A0B0C0D0E0F1011121314151617
        18191A1B1C1D1E1F2021222324252627
     P: 000102030405060708090A0B0C0D0E0F1011121314151617
        18191A1B1C1D1E1F2021222324252627
     C: 1792A4E31E0755FB03E31B22116E6C2DDF9EFD6E33D536F1
        A0124B0A55BAE884ED93481529C76B6AD0C515F4D1CDD4FD
        AC4F02AA

        The C has been split up in C and T (tag)
    */
   const unsigned char K[] = { 0x0F,0x0E,0x0D,0x0C,0x0B,0x0A,0x09,0x08,
                               0x07,0x06,0x05,0x04,0x03,0x02,0x01,0x00 };
   const unsigned char N[] = { 0xBB,0xAA,0x99,0x88,0x77,0x66,0x55,0x44,
                               0x33,0x22,0x11,0x0D };
   const unsigned char A[] = { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,
                               0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
                               0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,
                               0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
                               0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27 };
   const unsigned char P[] = { 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,
                               0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,
                               0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,
                               0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F,
                               0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27 };
   const unsigned char C[] = { 0x17,0x92,0xA4,0xE3,0x1E,0x07,0x55,0xFB,
                               0x03,0xE3,0x1B,0x22,0x11,0x6E,0x6C,0x2D,
                               0xDF,0x9E,0xFD,0x6E,0x33,0xD5,0x36,0xF1,
                               0xA0,0x12,0x4B,0x0A,0x55,0xBA,0xE8,0x84,
                               0xED,0x93,0x48,0x15,0x29,0xC7,0x6B,0x6A };
   const unsigned char T[] = { 0xD0,0xC5,0x15,0xF4,0xD1,0xCD,0xD4,0xFD,
                               0xAC,0x4F,0x02,0xAA };

   int err, x, idx, res;
   unsigned long len;
   unsigned char outct[MAXBLOCKSIZE]  = { 0 };
   unsigned char outtag[MAXBLOCKSIZE] = { 0 };
   ocb3_state ocb;

    /* AES can be under rijndael or aes... try to find it */
    if ((idx = find_cipher("aes")) == -1) {
       if ((idx = find_cipher("rijndael")) == -1) {
          return CRYPT_NOP;
       }
    }

    for (x = 0; x < (int)(sizeof(tests)/sizeof(tests[0])); x++) {
        len = 16; /* must be the same as the required taglen */
        if ((err = ocb3_encrypt_authenticate_memory(idx,
                                                   key, sizeof(key),
                                                   nonce, sizeof(nonce),
                                                   tests[x].aadlen != 0 ? tests[x].aad : NULL, tests[x].aadlen,
                                                   tests[x].ptlen != 0 ? tests[x].pt : NULL, tests[x].ptlen,
                                                   tests[x].ptlen != 0 ? outct : NULL, outtag, &len)) != CRYPT_OK) {
           return err;
        }

        if (compare_testvector(outtag, len, tests[x].tag, sizeof(tests[x].tag), "OCB3 Tag", x) ||
              compare_testvector(outct, tests[x].ptlen, tests[x].ct, tests[x].ptlen, "OCB3 CT", x)) {
           return CRYPT_FAIL_TESTVECTOR;
        }

        if ((err = ocb3_decrypt_verify_memory(idx,
                                             key, sizeof(key),
                                             nonce, sizeof(nonce),
                                             tests[x].aadlen != 0 ? tests[x].aad : NULL, tests[x].aadlen,
                                             tests[x].ptlen != 0 ? outct : NULL, tests[x].ptlen,
                                             tests[x].ptlen != 0 ? outct : NULL, tests[x].tag, len, &res)) != CRYPT_OK) {
           return err;
        }
        if ((res != 1) || compare_testvector(outct, tests[x].ptlen, tests[x].pt, tests[x].ptlen, "OCB3", x)) {
#ifdef LTC_TEST_DBG
           printf("\n\nOCB3: Failure-decrypt - res = %d\n", res);
#endif
           return CRYPT_FAIL_TESTVECTOR;
        }
    }

    /* RFC 7253 - test vector with a tag length of 96 bits - part 1 */
    x = 99;
    len = 12;
    if ((err = ocb3_encrypt_authenticate_memory(idx,
                                                K, sizeof(K),
                                                N, sizeof(N),
                                                A, sizeof(A),
                                                P, sizeof(P),
                                                outct, outtag, &len)) != CRYPT_OK) {
       return err;
    }

    if (compare_testvector(outtag, len, T, sizeof(T), "OCB3 Tag", x) ||
          compare_testvector(outct, sizeof(P), C, sizeof(C), "OCB3 CT", x)) {
       return CRYPT_FAIL_TESTVECTOR;
    }

    if ((err = ocb3_decrypt_verify_memory(idx,
                                          K, sizeof(K),
                                          N, sizeof(N),
                                          A, sizeof(A),
                                          C, sizeof(C),
                                          outct, T, sizeof(T), &res)) != CRYPT_OK) {
       return err;
    }
    if ((res != 1) || compare_testvector(outct, sizeof(C), P, sizeof(P), "OCB3", x)) {
#ifdef LTC_TEST_DBG
       printf("\n\nOCB3: Failure-decrypt - res = %d\n", res);
#endif
       return CRYPT_FAIL_TESTVECTOR;
    }

    /* RFC 7253 - test vector with a tag length of 96 bits - part 2 */
    x = 100;
    if ((err = ocb3_init(&ocb, idx, K, sizeof(K), N, sizeof(N), 12)) != CRYPT_OK)  return err;
    if ((err = ocb3_add_aad(&ocb, A, sizeof(A))) != CRYPT_OK)                      return err;
    if ((err = ocb3_encrypt(&ocb, P, 32, outct)) != CRYPT_OK)                      return err;
    if ((err = ocb3_encrypt_last(&ocb, P+32, sizeof(P)-32, outct+32)) != CRYPT_OK) return err;
    len = sizeof(outtag); /* intentionally more than 12 */
    if ((err = ocb3_done(&ocb, outtag, &len)) != CRYPT_OK)                         return err;
    if (compare_testvector(outct, sizeof(P), C, sizeof(C), "OCB3 CT", x))          return CRYPT_FAIL_TESTVECTOR;
    if (compare_testvector(outtag, len, T, sizeof(T), "OCB3 Tag.enc", x))          return CRYPT_FAIL_TESTVECTOR;
    if ((err = ocb3_init(&ocb, idx, K, sizeof(K), N, sizeof(N), 12)) != CRYPT_OK)  return err;
    if ((err = ocb3_add_aad(&ocb, A, sizeof(A))) != CRYPT_OK)                      return err;
    if ((err = ocb3_decrypt(&ocb, C, 32, outct)) != CRYPT_OK)                      return err;
    if ((err = ocb3_decrypt_last(&ocb, C+32, sizeof(C)-32, outct+32)) != CRYPT_OK) return err;
    len = sizeof(outtag); /* intentionally more than 12 */
    if ((err = ocb3_done(&ocb, outtag, &len)) != CRYPT_OK)                         return err;
    if (compare_testvector(outct, sizeof(C), P, sizeof(P), "OCB3 PT", x))          return CRYPT_FAIL_TESTVECTOR;
    if (compare_testvector(outtag, len, T, sizeof(T), "OCB3 Tag.dec", x))          return CRYPT_FAIL_TESTVECTOR;

    return CRYPT_OK;
#endif /* LTC_TEST */
}

#endif /* LTC_OCB3_MODE */

/* ref:         $Format:%D$ */
/* git commit:  $Format:%H$ */
/* commit time: $Format:%ai$ */