38 lines
924 B
C
38 lines
924 B
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_MDH
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/**
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Binary export a DH key to a buffer
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@param out [out] The destination for the key
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@param outlen [in/out] The max size and resulting size of the DH key
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@param type Which type of key (PK_PRIVATE or PK_PUBLIC)
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@param key The key you wish to export
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@return CRYPT_OK if successful
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*/
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int dh_export_key(void *out, unsigned long *outlen, int type, const dh_key *key)
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{
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unsigned long len;
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void *k;
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LTC_ARGCHK(out != NULL);
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LTC_ARGCHK(outlen != NULL);
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LTC_ARGCHK(key != NULL);
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k = (type == PK_PRIVATE) ? key->x : key->y;
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len = ltc_mp_unsigned_bin_size(k);
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if (*outlen < len) {
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*outlen = len;
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return CRYPT_BUFFER_OVERFLOW;
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}
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*outlen = len;
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return ltc_mp_to_unsigned_bin(k, out);
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}
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#endif /* LTC_MDH */
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