159 lines
4.0 KiB
C
159 lines
4.0 KiB
C
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: LTCImportEx.c
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Date: 2021-6-24
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Author: Reece
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***/
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#include <tomcrypt.h>
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#include "tomcrypt_private.h"
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#include "LTCExtensions.h"
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int rsa_import_ex(const unsigned char *in, unsigned long inlen, rsa_key *key, int flags)
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{
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int err;
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void *zero;
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char scratch[4096];
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const unsigned char *rsa = scratch;
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unsigned long rsa_len = sizeof(scratch);
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unsigned long len;
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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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{
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return err;
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}
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len = 0;
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if ((flags & kRsaFlagPKCS1) != 0)
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{
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rsa = in;
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rsa_len = inlen;
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}
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else
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{
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unsigned long oid[16];
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const char *rsaoid;
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ltc_asn1_list alg_seq[2], top_seq[3];
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ltc_asn1_list *l = NULL;
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/* get RSA alg oid */
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err = pk_get_oid(LTC_OID_RSA, &rsaoid);
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if (err != CRYPT_OK)
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{
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goto LBL_ERR;
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}
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if ((err = mp_init(&zero)) != CRYPT_OK)
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{
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goto LBL_ERR;
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}
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LTC_SET_ASN1(alg_seq, 0, LTC_ASN1_OBJECT_IDENTIFIER, oid, 16UL);
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LTC_SET_ASN1(alg_seq, 1, LTC_ASN1_NULL, NULL, 0UL);// << key
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if ((flags & kRsaFlagPublic) == 0)
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{
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LTC_SET_ASN1(top_seq, 0, LTC_ASN1_INTEGER, zero, 1UL);
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LTC_SET_ASN1(top_seq, 1, LTC_ASN1_SEQUENCE, alg_seq, 2UL);
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LTC_SET_ASN1(top_seq, 2, LTC_ASN1_OCTET_STRING, rsa, rsa_len);
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err = der_decode_sequence(in, inlen, top_seq, 3UL);
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}
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else
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{
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LTC_SET_ASN1(top_seq, 0, LTC_ASN1_SEQUENCE, alg_seq, 1UL);
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LTC_SET_ASN1(top_seq, 1, LTC_ASN1_BIT_STRING, rsa, rsa_len);
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err = der_decode_sequence(in, inlen, top_seq, 2UL);
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}
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mp_clear(zero);
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rsa_len = top_seq[2].size;
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if (err != CRYPT_OK)
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{
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goto LBL_ERR;
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}
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/* check alg oid */
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if ((err = pk_oid_cmp_with_asn1(rsaoid, &alg_seq[0])) != CRYPT_OK)
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{
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goto LBL_ERR;
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}
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}
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if ((flags & kRsaFlagPublic) != 0)
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{
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/* it's a public key and we lack e */
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if ((err = der_decode_sequence_multi(rsa, rsa_len,
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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)) != CRYPT_OK)
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{
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goto LBL_ERR;
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}
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key->type = PK_PUBLIC;
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}
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else
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{
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err = der_decode_sequence_multi(rsa, rsa_len, LTC_ASN1_INTEGER, 1UL, key->N,
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LTC_ASN1_EOL, 0UL, NULL);
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if (err != CRYPT_OK && err != CRYPT_INPUT_TOO_LONG)
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{
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goto LBL_ERR;
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}
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if (mp_cmp_d(key->N, 0) == LTC_MP_EQ)
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{
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if ((err = mp_init(&zero)) != CRYPT_OK)
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{
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goto LBL_ERR;
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}
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/* it's a private key */
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if ((err = der_decode_sequence_multi(rsa, rsa_len,
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LTC_ASN1_INTEGER, 1UL, zero,
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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_INTEGER, 1UL, key->d,
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LTC_ASN1_INTEGER, 1UL, key->p,
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LTC_ASN1_INTEGER, 1UL, key->q,
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LTC_ASN1_INTEGER, 1UL, key->dP,
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LTC_ASN1_INTEGER, 1UL, key->dQ,
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LTC_ASN1_INTEGER, 1UL, key->qP,
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LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK)
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{
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mp_clear(zero);
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goto LBL_ERR;
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}
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mp_clear(zero);
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key->type = PK_PRIVATE;
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}
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else if (mp_cmp_d(key->N, 1) == LTC_MP_EQ)
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{
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/* we don't support multi-prime RSA */
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err = CRYPT_PK_INVALID_TYPE;
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goto LBL_ERR;
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}
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else
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{
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err = CRYPT_PK_INVALID_TYPE;
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goto LBL_ERR;
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}
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}
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return CRYPT_OK;
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LBL_ERR:
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rsa_free(key);
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return err;
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} |