Mercurial > dropbear
annotate libtomcrypt/src/pk/asn1/der/short_integer/der_length_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_length_short_integer.c |
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15 ASN.1 DER, get length of encoding, 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 Gets length of DER encoding of num |
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22 @param num The integer to get the size of |
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23 @param outlen [out] The length of the DER encoding for the given integer |
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24 @return CRYPT_OK if successful |
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25 */ |
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26 int der_length_short_integer(unsigned long num, unsigned long *outlen) |
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27 { |
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28 unsigned long z, y, len; |
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29 |
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30 LTC_ARGCHK(outlen != NULL); |
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31 |
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32 /* force to 32 bits */ |
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33 num &= 0xFFFFFFFFUL; |
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34 |
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35 /* get the number of bytes */ |
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36 z = 0; |
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37 y = num; |
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38 while (y) { |
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39 ++z; |
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40 y >>= 8; |
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41 } |
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42 |
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43 /* handle zero */ |
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44 if (z == 0) { |
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45 z = 1; |
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46 } |
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47 |
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48 /* we need a 0x02 to indicate it's INTEGER */ |
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49 len = 1; |
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50 |
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51 /* length byte */ |
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52 ++len; |
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53 |
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54 /* bytes in value */ |
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55 len += z; |
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56 |
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57 /* see if msb is set */ |
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58 len += (num&(1UL<<((z<<3) - 1))) ? 1 : 0; |
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59 |
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60 /* return length */ |
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61 *outlen = len; |
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62 |
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63 return CRYPT_OK; |
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64 } |
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65 |
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66 #endif |
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67 |
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68 /* $Source$ */ |
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69 /* $Revision$ */ |
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70 /* $Date$ */ |