2004-05-31 02:36:47 +00:00
|
|
|
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
|
|
|
|
*
|
|
|
|
* LibTomCrypt is a library that provides various cryptographic
|
|
|
|
* algorithms in a highly modular and flexible manner.
|
|
|
|
*
|
|
|
|
* The library is free for all purposes without any express
|
|
|
|
* guarantee it works.
|
|
|
|
*
|
2005-04-17 11:37:13 +00:00
|
|
|
* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
|
2004-05-31 02:36:47 +00:00
|
|
|
*/
|
2004-12-30 23:55:53 +00:00
|
|
|
#include "tomcrypt.h"
|
2004-05-31 02:36:47 +00:00
|
|
|
|
2004-12-30 23:55:53 +00:00
|
|
|
/**
|
|
|
|
@file rsa_import.c
|
|
|
|
Import a PKCS RSA key, Tom St Denis
|
|
|
|
*/
|
2004-05-31 02:36:47 +00:00
|
|
|
|
|
|
|
#ifdef MRSA
|
|
|
|
|
2004-12-30 23:55:53 +00:00
|
|
|
/**
|
|
|
|
Import an RSAPublicKey or RSAPrivateKey [two-prime only, defined in PKCS #1 v2.1]
|
|
|
|
@param in The packet to import from
|
|
|
|
@param inlen It's length (octets)
|
|
|
|
@param key [out] Destination for newly imported key
|
|
|
|
@return CRYPT_OK if successful, upon error allocated memory is freed
|
|
|
|
*/
|
2004-05-31 02:36:47 +00:00
|
|
|
int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key)
|
|
|
|
{
|
2005-04-17 11:37:13 +00:00
|
|
|
unsigned long x, y;
|
2004-05-31 02:36:47 +00:00
|
|
|
int err;
|
|
|
|
|
2004-12-30 23:55:53 +00:00
|
|
|
LTC_ARGCHK(in != NULL);
|
|
|
|
LTC_ARGCHK(key != NULL);
|
2004-05-31 02:36:47 +00:00
|
|
|
|
|
|
|
/* init key */
|
|
|
|
if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP,
|
2004-10-30 03:00:26 +00:00
|
|
|
&key->p, &key->q, NULL)) != MP_OKAY) {
|
2004-05-31 02:36:47 +00:00
|
|
|
return mpi_to_ltc_error(err);
|
|
|
|
}
|
|
|
|
|
2005-04-17 11:37:13 +00:00
|
|
|
/* check the header */
|
|
|
|
if (inlen < 4) {
|
|
|
|
return CRYPT_INVALID_PACKET;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* should be 0x30 0x8{1|2} LL LL */
|
|
|
|
if ((in[0] != 0x30) || ((in[1] != 0x81) && (in[1] != 0x82))) {
|
|
|
|
return CRYPT_INVALID_PACKET;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ok all the ASN.1 params are fine so far, let's move up */
|
|
|
|
x = ((unsigned long)in[2]);
|
|
|
|
y = 0;
|
2005-04-19 11:30:30 +00:00
|
|
|
if ((in[1] & ~0x80) == 2) {
|
2005-04-17 11:37:13 +00:00
|
|
|
x = (x << 8) + ((unsigned long)in[3]) + 1;
|
|
|
|
in += 1;
|
|
|
|
y = 1;
|
|
|
|
}
|
|
|
|
in += 3; /* advance input */
|
|
|
|
x += 3; /* size of packet according to header */
|
|
|
|
y += 3; /* used input */
|
|
|
|
|
|
|
|
if (x != inlen) {
|
|
|
|
return CRYPT_INVALID_PACKET;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* decrement inlen by the header size */
|
|
|
|
inlen -= y;
|
|
|
|
|
2004-10-30 03:00:26 +00:00
|
|
|
/* read first number, it's either N or 0 [0 == private key] */
|
|
|
|
x = inlen;
|
|
|
|
if ((err = der_get_multi_integer(in, &x, &key->N, NULL)) != CRYPT_OK) {
|
2004-12-30 23:55:53 +00:00
|
|
|
goto LBL_ERR;
|
2004-05-31 02:36:47 +00:00
|
|
|
}
|
|
|
|
|
2004-10-30 03:00:26 +00:00
|
|
|
/* advance */
|
|
|
|
inlen -= x;
|
|
|
|
in += x;
|
|
|
|
|
|
|
|
if (mp_cmp_d(&key->N, 0) == MP_EQ) {
|
|
|
|
/* it's a private key */
|
|
|
|
if ((err = der_get_multi_integer(in, &inlen, &key->N, &key->e,
|
|
|
|
&key->d, &key->p, &key->q, &key->dP,
|
|
|
|
&key->dQ, &key->qP, NULL)) != CRYPT_OK) {
|
2004-12-30 23:55:53 +00:00
|
|
|
goto LBL_ERR;
|
2004-10-30 03:00:26 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
key->type = PK_PRIVATE;
|
2004-12-30 23:55:53 +00:00
|
|
|
} else if (mp_cmp_d(&key->N, 1) == MP_EQ) {
|
|
|
|
/* we don't support multi-prime RSA */
|
|
|
|
err = CRYPT_PK_INVALID_TYPE;
|
|
|
|
goto LBL_ERR;
|
2004-10-30 03:00:26 +00:00
|
|
|
} else {
|
|
|
|
/* it's a public key and we lack e */
|
|
|
|
if ((err = der_get_multi_integer(in, &inlen, &key->e, NULL)) != CRYPT_OK) {
|
2004-12-30 23:55:53 +00:00
|
|
|
goto LBL_ERR;
|
2004-10-30 03:00:26 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* free up some ram */
|
|
|
|
mp_clear_multi(&key->p, &key->q, &key->qP, &key->dP, &key->dQ, NULL);
|
|
|
|
|
|
|
|
key->type = PK_PUBLIC;
|
2004-05-31 02:36:47 +00:00
|
|
|
}
|
|
|
|
return CRYPT_OK;
|
2004-12-30 23:55:53 +00:00
|
|
|
LBL_ERR:
|
2004-05-31 02:36:47 +00:00
|
|
|
mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP,
|
2004-10-30 03:00:26 +00:00
|
|
|
&key->qP, &key->p, &key->q, NULL);
|
2004-05-31 02:36:47 +00:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* MRSA */
|
|
|
|
|