Mercurial > dropbear
view 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) |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. * * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com */ #include "tomcrypt.h" /** @file pkcs_1_i2osp.c Integer to Octet I2OSP, Tom St Denis */ #ifdef PKCS_1 /* always stores the same # of bytes, pads with leading zero bytes as required */ /** PKCS #1 Integer to binary @param n The integer to store @param modulus_len The length of the RSA modulus @param out [out] The destination for the integer @return CRYPT_OK if successful */ int pkcs_1_i2osp(void *n, unsigned long modulus_len, unsigned char *out) { unsigned long size; size = mp_unsigned_bin_size(n); if (size > modulus_len) { return CRYPT_BUFFER_OVERFLOW; } /* store it */ zeromem(out, modulus_len); return mp_to_unsigned_bin(n, out+(modulus_len-size)); } #endif /* PKCS_1 */ /* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c,v $ */ /* $Revision: 1.5 $ */ /* $Date: 2006/03/31 14:15:35 $ */