92 lines
2.7 KiB
C
92 lines
2.7 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_export.c
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Export RSA PKCS keys, Tom St Denis
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*/
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#ifdef LTC_MRSA
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/**
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This will export either an RSAPublicKey or RSAPrivateKey [defined in PKCS #1 v2.1]
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@param out [out] Destination of the packet
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@param outlen [in/out] The max size and resulting size of the packet
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@param type The type of exported key (PK_PRIVATE or PK_PUBLIC)
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@param key The RSA key to export
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@return CRYPT_OK if successful
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*/
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int rsa_export(unsigned char *out, unsigned long *outlen, int type, const rsa_key *key)
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{
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unsigned long zero=0;
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int err, std;
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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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std = type & PK_STD;
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type &= ~PK_STD;
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if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
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return CRYPT_PK_TYPE_MISMATCH;
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}
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if (type == PK_PRIVATE) {
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/* private key */
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/* output is
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Version, n, e, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p
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*/
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return der_encode_sequence_multi(out, outlen,
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LTC_ASN1_SHORT_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);
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}
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if (type == PK_PUBLIC) {
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/* public key */
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unsigned long tmplen, *ptmplen;
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unsigned char* tmp = NULL;
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if (std) {
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tmplen = (unsigned long)(ltc_mp_count_bits(key->N) / 8) * 2 + 8;
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tmp = XMALLOC(tmplen);
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ptmplen = &tmplen;
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if (tmp == NULL) {
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return CRYPT_MEM;
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}
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}
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else {
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tmp = out;
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ptmplen = outlen;
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}
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err = der_encode_sequence_multi(tmp, ptmplen,
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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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if ((err != CRYPT_OK) || !std) {
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goto finish;
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}
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err = x509_encode_subject_public_key_info(out, outlen,
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LTC_OID_RSA, tmp, tmplen, LTC_ASN1_NULL, NULL, 0);
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finish:
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if (tmp != out) XFREE(tmp);
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return err;
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}
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return CRYPT_INVALID_ARG;
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}
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#endif /* LTC_MRSA */
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