Mercurial > dropbear
annotate libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c @ 817:a625f9e135a4
Constant time memcmp for the hmac and password crypt
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 03 Oct 2013 22:25:30 +0800 (2013-10-03) |
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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, tomstdenis@gmail.com, http://libtomcrypt.com |
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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 pkcs_1_i2osp.c |
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15 Integer to Octet I2OSP, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef PKCS_1 |
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19 |
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20 /* always stores the same # of bytes, pads with leading zero bytes |
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21 as required |
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22 */ |
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23 |
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24 /** |
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25 PKCS #1 Integer to binary |
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26 @param n The integer to store |
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27 @param modulus_len The length of the RSA modulus |
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28 @param out [out] The destination for the integer |
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29 @return CRYPT_OK if successful |
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30 */ |
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31 int pkcs_1_i2osp(void *n, unsigned long modulus_len, unsigned char *out) |
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32 { |
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33 unsigned long size; |
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34 |
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35 size = mp_unsigned_bin_size(n); |
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36 |
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37 if (size > modulus_len) { |
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38 return CRYPT_BUFFER_OVERFLOW; |
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39 } |
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40 |
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41 /* store it */ |
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42 zeromem(out, modulus_len); |
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43 return mp_to_unsigned_bin(n, out+(modulus_len-size)); |
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44 } |
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45 |
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46 #endif /* PKCS_1 */ |
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47 |
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48 |
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49 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c,v $ */ |
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50 /* $Revision: 1.5 $ */ |
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51 /* $Date: 2006/03/31 14:15:35 $ */ |