Mercurial > dropbear
annotate libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c @ 397:2908122e9eed channel-fix
disapproval of revision '1250b8af44b62d8f4fe0f8d9fc7e7a1cc34e7e1c'
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sat, 03 Feb 2007 08:10:09 +0000 |
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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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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(mp_int *n, unsigned long modulus_len, unsigned char *out) |
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32 { |
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33 int err; |
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34 unsigned long size; |
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35 |
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36 size = mp_unsigned_bin_size(n); |
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37 |
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38 if (size > modulus_len) { |
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39 return CRYPT_BUFFER_OVERFLOW; |
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40 } |
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41 |
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42 /* store it */ |
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43 zeromem(out, modulus_len); |
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44 if ((err = mp_to_unsigned_bin(n, out+(modulus_len-size))) != MP_OKAY) { |
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45 return mpi_to_ltc_error(err); |
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46 } |
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47 return CRYPT_OK; |
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48 } |
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49 |
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50 #endif /* PKCS_1 */ |
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51 |
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52 |
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53 /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c,v $ */ |
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54 /* $Revision: 1.3 $ */ |
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55 /* $Date: 2005/05/05 14:35:59 $ */ |