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/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
#include "tomcrypt_private.h"
/**
@file x25519_make_key.c
Create a X25519 key, Steffen Jaeckel
*/
#ifdef LTC_CURVE25519
/**
Create a X25519 key
@param prng An active PRNG state
@param wprng The index of the PRNG desired
@param key [out] Destination of a newly created private key pair
@return CRYPT_OK if successful
*/
int x25519_make_key(prng_state *prng, int wprng, curve25519_key *key)
{
int err;
LTC_ARGCHK(prng != NULL);
LTC_ARGCHK(key != NULL);
if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
return err;
}
if (prng_descriptor[wprng].read(key->priv, sizeof(key->priv), prng) != sizeof(key->priv)) {
return CRYPT_ERROR_READPRNG;
}
tweetnacl_crypto_scalarmult_base(key->pub, key->priv);
key->type = PK_PRIVATE;
key->algo = PKA_X25519;
return err;
}
#endif
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