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98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.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, rsa_key *key)
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{
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unsigned long zero=0;
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int err;
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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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/* type valid? */
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if (!(key->type == PK_PRIVATE) && (type == PK_PRIVATE)) {
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return CRYPT_PK_INVALID_TYPE;
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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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} else {
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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 (type & PK_STD) {
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tmplen = (unsigned long)(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) || !(type & PK_STD)) {
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goto finish;
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}
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err = der_encode_subject_public_key_info(out, outlen,
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PKA_RSA, tmp, tmplen, LTC_ASN1_NULL, NULL, 0);
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finish:
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if (tmp != out)
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XFREE(tmp);
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return err;
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}
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}
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#endif /* LTC_MRSA */
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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