Mercurial > dropbear
view libtomcrypt/src/pk/ecc/ecc_ansi_x963_import.c @ 652:17962b2a6b8f
- Make sure we don't use channel-specific data after it has been freed
with a ChanType->closehandler()
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Sun, 04 Dec 2011 05:27:29 +0800 (2011-12-03) |
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 */ /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b * * All curves taken from NIST recommendation paper of July 1999 * Available at http://csrc.nist.gov/cryptval/dss.htm */ #include "tomcrypt.h" /** @file ecc_ansi_x963_import.c ECC Crypto, Tom St Denis */ #ifdef MECC /** Import an ANSI X9.63 format public key @param in The input data to read @param inlen The length of the input data @param key [out] destination to store imported key \ */ int ecc_ansi_x963_import(const unsigned char *in, unsigned long inlen, ecc_key *key) { return ecc_ansi_x963_import_ex(in, inlen, key, NULL); } int ecc_ansi_x963_import_ex(const unsigned char *in, unsigned long inlen, ecc_key *key, ltc_ecc_set_type *dp) { int x, err; LTC_ARGCHK(in != NULL); LTC_ARGCHK(key != NULL); /* must be odd */ if ((inlen & 1) == 0) { return CRYPT_INVALID_ARG; } /* init key */ if (mp_init_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, NULL) != CRYPT_OK) { return CRYPT_MEM; } /* check for 4, 6 or 7 */ if (in[0] != 4 && in[0] != 6 && in[0] != 7) { err = CRYPT_INVALID_PACKET; goto error; } /* read data */ if ((err = mp_read_unsigned_bin(key->pubkey.x, (unsigned char *)in+1, (inlen-1)>>1)) != CRYPT_OK) { goto error; } if ((err = mp_read_unsigned_bin(key->pubkey.y, (unsigned char *)in+1+((inlen-1)>>1), (inlen-1)>>1)) != CRYPT_OK) { goto error; } if ((err = mp_set(key->pubkey.z, 1)) != CRYPT_OK) { goto error; } if (dp == NULL) { /* determine the idx */ for (x = 0; ltc_ecc_sets[x].size != 0; x++) { if ((unsigned)ltc_ecc_sets[x].size >= ((inlen-1)>>1)) { break; } } if (ltc_ecc_sets[x].size == 0) { err = CRYPT_INVALID_PACKET; goto error; } /* set the idx */ key->idx = x; key->dp = <c_ecc_sets[x]; } else { if (((inlen-1)>>1) != (unsigned long) dp->size) { err = CRYPT_INVALID_PACKET; goto error; } key->idx = -1; key->dp = dp; } key->type = PK_PUBLIC; /* we're done */ return CRYPT_OK; error: mp_clear_multi(key->pubkey.x, key->pubkey.y, key->pubkey.z, key->k, NULL); return err; } #endif /* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc_ansi_x963_import.c,v $ */ /* $Revision: 1.9 $ */ /* $Date: 2006/12/04 22:17:46 $ */