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annotate libtomcrypt/src/math/radix_to_bin.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file radix_to_bin.c
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13 Convert data from a specific radix to binary.
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14 Steffen Jaeckel
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15 */
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16
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17 /**
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18 Convert data from a specific radix to binary
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19
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20 The default MPI descriptors #ltm_desc, #tfm_desc and #gmp_desc
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21 have the following restrictions on parameters:
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22
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23 \p in - NUL-terminated char buffer
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24
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25 \p radix - 2..64
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26
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27 @param in The input
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28 @param radix The radix of the input
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29 @param out The output buffer
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30 @param len [in/out] The length of the output buffer
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31
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32 @return CRYPT_OK on success.
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33 */
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34 int radix_to_bin(const void *in, int radix, void *out, unsigned long *len)
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35 {
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36 unsigned long l;
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37 void* mpi;
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38 int err;
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39
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40 LTC_ARGCHK(in != NULL);
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41 LTC_ARGCHK(len != NULL);
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42
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43 if ((err = mp_init(&mpi)) != CRYPT_OK) return err;
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44 if ((err = mp_read_radix(mpi, in, radix)) != CRYPT_OK) goto LBL_ERR;
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45
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46 if ((l = mp_unsigned_bin_size(mpi)) > *len) {
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47 *len = l;
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48 err = CRYPT_BUFFER_OVERFLOW;
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49 goto LBL_ERR;
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50 }
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51 *len = l;
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52
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53 if ((err = mp_to_unsigned_bin(mpi, out)) != CRYPT_OK) goto LBL_ERR;
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54
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55 LBL_ERR:
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56 mp_clear(mpi);
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57 return err;
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58 }
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59
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60 /* ref: $Format:%D$ */
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61 /* git commit: $Format:%H$ */
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62 /* commit time: $Format:%ai$ */