55 lines
1.6 KiB
C
55 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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/**
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@file rsa_import.c
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Import an RSA key from a X.509 certificate, Steffen Jaeckel
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*/
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#ifdef LTC_MRSA
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static int s_rsa_decode(const unsigned char *in, unsigned long inlen, rsa_key *key)
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{
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/* now it should be SEQUENCE { INTEGER, INTEGER } */
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return der_decode_sequence_multi(in, inlen,
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LTC_ASN1_INTEGER, 1UL, key->N,
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LTC_ASN1_INTEGER, 1UL, key->e,
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LTC_ASN1_EOL, 0UL, NULL);
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}
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/**
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Import an RSA key from a X.509 certificate
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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 key [out] Destination for newly imported key
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@return CRYPT_OK if successful, upon error allocated memory is freed
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*/
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int rsa_import_x509(const unsigned char *in, unsigned long inlen, rsa_key *key)
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{
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int err;
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(ltc_mp.name != NULL);
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/* init key */
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if ((err = rsa_init(key)) != CRYPT_OK) {
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return err;
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}
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if ((err = x509_decode_public_key_from_certificate(in, inlen,
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LTC_OID_RSA,
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LTC_ASN1_NULL, NULL, NULL,
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(public_key_decode_cb)s_rsa_decode, key)) != CRYPT_OK) {
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rsa_free(key);
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} else {
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key->type = PK_PUBLIC;
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}
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return err;
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}
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#endif /* LTC_MRSA */
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