54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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#ifdef LTC_MECC
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/** Export raw public or private key (public keys = ANS X9.63 compressed or uncompressed; private keys = raw bytes)
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@param out [out] destination of export
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@param outlen [in/out] Length of destination and final output size
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@param type PK_PRIVATE, PK_PUBLIC or PK_PUBLIC|PK_COMPRESSED
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@param key Key to export
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Return CRYPT_OK on success
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*/
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int ecc_get_key(unsigned char *out, unsigned long *outlen, int type, const ecc_key *key)
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{
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unsigned long size, ksize;
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int err, compressed;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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size = key->dp.size;
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compressed = type & PK_COMPRESSED ? 1 : 0;
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type &= ~PK_COMPRESSED;
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if (type == PK_PUBLIC) {
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if ((err = ltc_ecc_export_point(out, outlen, key->pubkey.x, key->pubkey.y, size, compressed)) != CRYPT_OK) {
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return err;
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}
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}
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else if (type == PK_PRIVATE) {
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if (key->type != PK_PRIVATE) return CRYPT_PK_TYPE_MISMATCH;
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if (size > *outlen) {
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*outlen = size;
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return CRYPT_BUFFER_OVERFLOW;
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}
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*outlen = size;
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if ((ksize = ltc_mp_unsigned_bin_size(key->k)) > size) return CRYPT_BUFFER_OVERFLOW;
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/* pad and store k */
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if ((err = ltc_mp_to_unsigned_bin(key->k, out + (size - ksize))) != CRYPT_OK) return err;
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zeromem(out, size - ksize);
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}
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else {
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return CRYPT_INVALID_ARG;
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}
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return CRYPT_OK;
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}
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#endif
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