1 // SPDX-License-Identifier: BSD-2-Clause
2 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 *
4 * LibTomCrypt is a library that provides various cryptographic
5 * algorithms in a highly modular and flexible manner.
6 *
7 * The library is free for all purposes without any express
8 * guarantee it works.
9 */
10 #include "tomcrypt_private.h"
11
12 /**
13 @file radix_to_bin.c
14 Convert data from a specific radix to binary.
15 Steffen Jaeckel
16 */
17
18 /**
19 Convert data from a specific radix to binary
20
21 The default MPI descriptors #ltm_desc, #tfm_desc and #gmp_desc
22 have the following restrictions on parameters:
23
24 \p in - NUL-terminated char buffer
25
26 \p radix - 2..64
27
28 @param in The input
29 @param radix The radix of the input
30 @param out The output buffer
31 @param len [in/out] The length of the output buffer
32
33 @return CRYPT_OK on success.
34 */
radix_to_bin(const void * in,int radix,void * out,unsigned long * len)35 int radix_to_bin(const void *in, int radix, void *out, unsigned long *len)
36 {
37 unsigned long l;
38 void* mpi;
39 int err;
40
41 LTC_ARGCHK(in != NULL);
42 LTC_ARGCHK(len != NULL);
43
44 if ((err = mp_init(&mpi)) != CRYPT_OK) return err;
45 if ((err = mp_read_radix(mpi, in, radix)) != CRYPT_OK) goto LBL_ERR;
46
47 if ((l = mp_unsigned_bin_size(mpi)) > *len) {
48 *len = l;
49 err = CRYPT_BUFFER_OVERFLOW;
50 goto LBL_ERR;
51 }
52 *len = l;
53
54 if ((err = mp_to_unsigned_bin(mpi, out)) != CRYPT_OK) goto LBL_ERR;
55
56 LBL_ERR:
57 mp_clear(mpi);
58 return err;
59 }
60
61 /* ref: $Format:%D$ */
62 /* git commit: $Format:%H$ */
63 /* commit time: $Format:%ai$ */
64