Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/short_integer/der_decode_short_integer.c @ 1470:8bba51a55704
Update to libtommath v1.0.1
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 08 Feb 2018 23:11:40 +0800 |
parents | f849a5ca2efc |
children | 6dba84798cd5 |
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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://libtom.org |
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file der_decode_short_integer.c |
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15 ASN.1 DER, decode an integer, Tom St Denis |
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16 */ |
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17 |
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18 |
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19 #ifdef LTC_DER |
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20 |
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21 /** |
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22 Read a short integer |
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23 @param in The DER encoded data |
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24 @param inlen Size of data |
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25 @param num [out] The integer to decode |
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26 @return CRYPT_OK if successful |
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27 */ |
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28 int der_decode_short_integer(const unsigned char *in, unsigned long inlen, unsigned long *num) |
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29 { |
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30 unsigned long len, x, y; |
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31 |
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32 LTC_ARGCHK(num != NULL); |
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33 LTC_ARGCHK(in != NULL); |
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34 |
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35 /* check length */ |
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36 if (inlen < 2) { |
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37 return CRYPT_INVALID_PACKET; |
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38 } |
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39 |
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40 /* check header */ |
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41 x = 0; |
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42 if ((in[x++] & 0x1F) != 0x02) { |
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43 return CRYPT_INVALID_PACKET; |
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44 } |
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45 |
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46 /* get the packet len */ |
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47 len = in[x++]; |
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48 |
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49 if (x + len > inlen) { |
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50 return CRYPT_INVALID_PACKET; |
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51 } |
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52 |
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53 /* read number */ |
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54 y = 0; |
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55 while (len--) { |
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56 y = (y<<8) | (unsigned long)in[x++]; |
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57 } |
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58 *num = y; |
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59 |
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60 return CRYPT_OK; |
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61 |
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62 } |
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63 |
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64 #endif |
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65 |
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66 /* $Source$ */ |
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67 /* $Revision$ */ |
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68 /* $Date$ */ |