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annotate libtomcrypt/src/pk/ecc/ecc_get_size.c @ 1638:315fcba6960e

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dropbearconvert: keyimport.c: fix BER encoding of secp521r1 keys (#69) keysizes >= 128 octets will be encoded with a 3 byte header which must be accounted by the optional-header Reproduce: master:~/build/dropbear$ ./dropbearkey -t ecdsa -s 521 -f K Generating 521 bit ecdsa key, this may take a while... master:~/build/dropbear$ ./dropbearconvert d o K L Key is a ecdsa-sha2-nistp521 key Wrote key to 'L' master:~/build/dropbear$ openssl ec < L read EC key unable to load Key 139769806448384:error:0D07209B:asn1 encoding routines:ASN1_get_object:too long:crypto/asn1/asn1_lib.c:91:
author Christian Hohnstädt <christian@hohnstaedt.de>
date Wed, 20 Mar 2019 16:42:47 +0100
parents 6dba84798cd5
children
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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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10 /* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b
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11 *
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12 * All curves taken from NIST recommendation paper of July 1999
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13 * Available at http://csrc.nist.gov/cryptval/dss.htm
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14 */
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15 #include "tomcrypt.h"
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17 /**
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18 @file ecc_get_size.c
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19 ECC Crypto, Tom St Denis
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20 */
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22 #ifdef LTC_MECC
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24 /**
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25 Get the size of an ECC key
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26 @param key The key to get the size of
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27 @return The size (octets) of the key or INT_MAX on error
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28 */
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29 int ecc_get_size(ecc_key *key)
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30 {
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31 LTC_ARGCHK(key != NULL);
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32 if (ltc_ecc_is_valid_idx(key->idx))
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33 return key->dp->size;
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34 else
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35 return INT_MAX; /* large value known to cause it to fail when passed to ecc_make_key() */
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36 }
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38 #endif
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39 /* ref: $Format:%D$ */
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40 /* git commit: $Format:%H$ */
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41 /* commit time: $Format:%ai$ */
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