87 lines
2.4 KiB
C
87 lines
2.4 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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/**
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@file ec25519_import_pkcs8.c
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Generic import of a Curve/Ed25519 private key in PKCS#8 format, Steffen Jaeckel
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*/
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#ifdef LTC_CURVE25519
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typedef int (*sk_to_pk)(unsigned char *pk , const unsigned char *sk);
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int ec25519_import_pkcs8_asn1(ltc_asn1_list *alg_id, ltc_asn1_list *priv_key,
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enum ltc_oid_id id,
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curve25519_key *key)
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{
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int err;
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unsigned long key_len;
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sk_to_pk fp;
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(ltc_mp.name != NULL);
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LTC_UNUSED_PARAM(alg_id);
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switch (id) {
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case LTC_OID_ED25519:
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fp = tweetnacl_crypto_sk_to_pk;
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break;
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case LTC_OID_X25519:
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fp = tweetnacl_crypto_scalarmult_base;
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break;
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default:
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return CRYPT_PK_INVALID_TYPE;
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}
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key_len = sizeof(key->priv);
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if ((err = der_decode_octet_string(priv_key->data, priv_key->size, key->priv, &key_len)) == CRYPT_OK) {
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fp(key->pub, key->priv);
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key->type = PK_PRIVATE;
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err = pk_get_pka_id(id, &key->pka);
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}
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return err;
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}
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/**
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Generic import of a Curve/Ed25519 private key in PKCS#8 format
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@param in The packet to import from
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@param inlen It's length (octets)
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@param pw_ctx The password context when decrypting the private key
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@param id The type of the private key
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@param key [out] Destination for newly imported key
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@return CRYPT_OK if successful, on error all allocated memory is freed automatically
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*/
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int ec25519_import_pkcs8(const unsigned char *in, unsigned long inlen,
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const password_ctx *pw_ctx,
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enum ltc_oid_id id,
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curve25519_key *key)
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{
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int err;
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ltc_asn1_list *l = NULL;
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ltc_asn1_list *alg_id, *priv_key;
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enum ltc_oid_id pka;
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LTC_ARGCHK(in != NULL);
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err = pkcs8_decode_flexi(in, inlen, pw_ctx, &l);
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if (err != CRYPT_OK) return err;
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if ((err = pkcs8_get_children(l, &pka, &alg_id, &priv_key)) != CRYPT_OK) {
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goto LBL_DER_FREE;
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}
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if (pka != id) {
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err = CRYPT_INVALID_PACKET;
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goto LBL_DER_FREE;
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}
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err = ec25519_import_pkcs8_asn1(alg_id, priv_key, id, key);
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LBL_DER_FREE:
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der_free_sequence_flexi(l);
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return err;
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}
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#endif
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