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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.org |
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10 */ |
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11 #include "mycrypt.h" |
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12 |
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13 #ifdef PACKET |
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14 |
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15 int packet_valid_header(unsigned char *src, int section, int subsection) |
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16 { |
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17 unsigned long ver; |
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18 |
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19 _ARGCHK(src != NULL); |
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20 |
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21 /* check version */ |
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22 ver = ((unsigned long)src[0]) | ((unsigned long)src[1] << 8U); |
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23 if (CRYPT < ver) { |
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24 return CRYPT_INVALID_PACKET; |
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25 } |
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26 |
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27 /* check section and subsection */ |
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28 if (section != (int)src[2] || subsection != (int)src[3]) { |
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29 return CRYPT_INVALID_PACKET; |
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30 } |
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31 |
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32 return CRYPT_OK; |
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33 } |
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34 |
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35 #endif |
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36 |
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37 |
