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119 lines
3.7 KiB
C
119 lines
3.7 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_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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/**
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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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unsigned char *tmpbuf;
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unsigned long tmpbuf_len, tmp_inlen;
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ltc_asn1_list *decoded_list = NULL, *l;
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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 = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ,
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&key->dP, &key->qP, &key->p, &key->q, NULL)) != CRYPT_OK) {
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return err;
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}
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tmpbuf_len = inlen;
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tmpbuf = XCALLOC(1, tmpbuf_len);
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if (tmpbuf == NULL) {
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err = CRYPT_MEM;
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goto LBL_ERR;
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}
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tmp_inlen = inlen;
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if ((err = der_decode_sequence_flexi(in, &tmp_inlen, &decoded_list)) == CRYPT_OK) {
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l = decoded_list;
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/* Move 2 levels up in the tree
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SEQUENCE
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SEQUENCE
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...
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*/
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if (l->type == LTC_ASN1_SEQUENCE && l->child) {
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l = l->child;
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if (l->type == LTC_ASN1_SEQUENCE && l->child) {
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l = l->child;
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err = CRYPT_ERROR;
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/* Move forward in the tree until we find this combination
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...
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SEQUENCE
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SEQUENCE
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OBJECT IDENTIFIER 1.2.840.113549.1.1.1
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NULL
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BIT STRING
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*/
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do {
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/* The additional check for l->data is there to make sure
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* we won't try to decode a list that has been 'shrunk'
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*/
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if (l->type == LTC_ASN1_SEQUENCE && l->data && l->child &&
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l->child->type == LTC_ASN1_SEQUENCE && l->child->child &&
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l->child->child->type == LTC_ASN1_OBJECT_IDENTIFIER && l->child->next &&
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l->child->next->type == LTC_ASN1_BIT_STRING) {
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err = der_decode_subject_public_key_info(l->data, l->size,
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PKA_RSA, tmpbuf, &tmpbuf_len,
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LTC_ASN1_NULL, NULL, 0);
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if (err == CRYPT_OK) {
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/* now it should be SEQUENCE { INTEGER, INTEGER } */
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if ((err = der_decode_sequence_multi(tmpbuf, tmpbuf_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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goto LBL_ERR;
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}
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key->type = PK_PUBLIC;
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err = CRYPT_OK;
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goto LBL_FREE;
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}
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}
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l = l->next;
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} while(l);
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}
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}
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}
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LBL_ERR:
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rsa_free(key);
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LBL_FREE:
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if (decoded_list) der_free_sequence_flexi(decoded_list);
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if (tmpbuf != NULL) XFREE(tmpbuf);
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return err;
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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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