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update rsa_import_x509()

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This commit is contained in:
Steffen Jaeckel 2019-05-23 16:31:05 +02:00
parent 5119e71023
commit dfa5258db5
1 changed files with 16 additions and 70 deletions
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86
src/pk/rsa/rsa_import_x509.c
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@ -15,6 +15,15 @@
#ifdef LTC_MRSA
static int _rsa_decode(const unsigned char *in, unsigned long inlen, rsa_key *key)
{
/* now it should be SEQUENCE { INTEGER, INTEGER } */
return der_decode_sequence_multi(in, inlen,
LTC_ASN1_INTEGER, 1UL, key->N,
LTC_ASN1_INTEGER, 1UL, key->e,
LTC_ASN1_EOL, 0UL, NULL);
}
/**
Import an RSA key from a X.509 certificate
@param in The packet to import from
@ -25,9 +34,6 @@
int rsa_import_x509(const unsigned char *in, unsigned long inlen, rsa_key *key)
{
int err;
unsigned char *tmpbuf;
unsigned long tmpbuf_len, tmp_inlen, len;
ltc_asn1_list *decoded_list = NULL, *l;
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(key != NULL);
@ -39,74 +45,14 @@ int rsa_import_x509(const unsigned char *in, unsigned long inlen, rsa_key *key)
return err;
}
tmpbuf_len = inlen;
tmpbuf = XCALLOC(1, tmpbuf_len);
if (tmpbuf == NULL) {
err = CRYPT_MEM;
goto LBL_ERR;
}
tmp_inlen = inlen;
if ((err = der_decode_sequence_flexi(in, &tmp_inlen, &decoded_list)) == CRYPT_OK) {
l = decoded_list;
/* Move 2 levels up in the tree
SEQUENCE
SEQUENCE
...
*/
if (l->type == LTC_ASN1_SEQUENCE && l->child) {
l = l->child;
if (l->type == LTC_ASN1_SEQUENCE && l->child) {
l = l->child;
err = CRYPT_ERROR;
/* Move forward in the tree until we find this combination
...
SEQUENCE
SEQUENCE
OBJECT IDENTIFIER 1.2.840.113549.1.1.1
NULL
BIT STRING
*/
do {
/* The additional check for l->data is there to make sure
* we won't try to decode a list that has been 'shrunk'
*/
if (l->type == LTC_ASN1_SEQUENCE && l->data && l->child &&
l->child->type == LTC_ASN1_SEQUENCE && l->child->child &&
l->child->child->type == LTC_ASN1_OBJECT_IDENTIFIER && l->child->next &&
l->child->next->type == LTC_ASN1_BIT_STRING) {
len = 0;
err = x509_decode_subject_public_key_info(l->data, l->size,
PKA_RSA, tmpbuf, &tmpbuf_len,
LTC_ASN1_NULL, NULL, &len);
if (err == CRYPT_OK) {
/* now it should be SEQUENCE { INTEGER, INTEGER } */
if ((err = der_decode_sequence_multi(tmpbuf, tmpbuf_len,
LTC_ASN1_INTEGER, 1UL, key->N,
LTC_ASN1_INTEGER, 1UL, key->e,
LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
goto LBL_ERR;
}
key->type = PK_PUBLIC;
err = CRYPT_OK;
goto LBL_FREE;
}
}
l = l->next;
} while(l);
}
}
}
LBL_ERR:
if ((err = x509_decode_public_key_from_certificate(in, inlen,
PKA_RSA, LTC_ASN1_NULL,
NULL, NULL,
(public_key_decode_cb)_rsa_decode, key)) != CRYPT_OK) {
rsa_free(key);
LBL_FREE:
if (decoded_list) der_free_sequence_flexi(decoded_list);
if (tmpbuf != NULL) XFREE(tmpbuf);
} else {
key->type = PK_PUBLIC;
}
return err;
}