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annotate libtomcrypt/src/pk/packet_valid_header.c @ 409:0e69e948caba

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Add comments about requiring keysize <= 2*SHA1_HASH_SIZE
author Matt Johnston <matt@ucc.asn.au>
date Sun, 04 Feb 2007 10:31:48 +0000
parents 1b9e69c058d2
children
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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 "tomcrypt.h"
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13 #ifdef PACKET
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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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19 LTC_ARGCHK(src != NULL);
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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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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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32 return CRYPT_OK;
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33 }
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35 #endif
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39 /* $Source: /cvs/libtom/libtomcrypt/src/pk/packet_valid_header.c,v $ */
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40 /* $Revision: 1.3 $ */
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41 /* $Date: 2005/05/05 14:35:59 $ */