Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/short_integer/der_decode_short_integer.c @ 1633:592a18dac250
Support servers without multiple user support (#76)
author | Patrick Stewart <patstew@gmail.com> |
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date | Wed, 20 Mar 2019 14:44:49 +0000 |
parents | 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 #include "tomcrypt.h" |
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10 |
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11 /** |
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12 @file der_decode_short_integer.c |
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13 ASN.1 DER, decode an integer, Tom St Denis |
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14 */ |
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15 |
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16 |
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17 #ifdef LTC_DER |
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18 |
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19 /** |
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20 Read a short integer |
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21 @param in The DER encoded data |
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22 @param inlen Size of data |
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23 @param num [out] The integer to decode |
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24 @return CRYPT_OK if successful |
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25 */ |
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26 int der_decode_short_integer(const unsigned char *in, unsigned long inlen, unsigned long *num) |
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27 { |
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28 unsigned long len, x, y; |
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29 |
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30 LTC_ARGCHK(num != NULL); |
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31 LTC_ARGCHK(in != NULL); |
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32 |
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33 /* check length */ |
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34 if (inlen < 2) { |
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35 return CRYPT_INVALID_PACKET; |
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36 } |
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37 |
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38 /* check header */ |
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39 x = 0; |
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40 if ((in[x++] & 0x1F) != 0x02) { |
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41 return CRYPT_INVALID_PACKET; |
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42 } |
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43 |
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44 /* get the packet len */ |
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45 len = in[x++]; |
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46 |
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47 if (x + len > inlen) { |
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48 return CRYPT_INVALID_PACKET; |
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49 } |
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50 |
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51 /* read number */ |
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52 y = 0; |
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53 while (len--) { |
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54 y = (y<<8) | (unsigned long)in[x++]; |
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55 } |
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56 *num = y; |
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57 |
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58 return CRYPT_OK; |
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59 |
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60 } |
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61 |
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62 #endif |
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63 |
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64 /* ref: $Format:%D$ */ |
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65 /* git commit: $Format:%H$ */ |
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66 /* commit time: $Format:%ai$ */ |