static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
{
- const unsigned char *p;
- unsigned char *tmpbuf, *q;
- unsigned int i;
- p = *in + nbyte - 1;
- tmpbuf = OPENSSL_malloc(nbyte);
- if (tmpbuf == NULL)
- return 0;
- q = tmpbuf;
- for (i = 0; i < nbyte; i++)
- *q++ = *p--;
- *r = BN_bin2bn(tmpbuf, nbyte, NULL);
- OPENSSL_free(tmpbuf);
- if (*r) {
- *in += nbyte;
- return 1;
- } else
+ *r = BN_lebin2bn(*in, nbyte, NULL);
+ if (*r == NULL)
return 0;
+ *in += nbyte;
+ return 1;
}
/* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
static void write_lebn(unsigned char **out, const BIGNUM *bn, int len)
{
- int nb, i;
- unsigned char *p = *out, *q, c;
- nb = BN_num_bytes(bn);
- BN_bn2bin(bn, p);
- q = p + nb - 1;
- /* In place byte order reversal */
- for (i = 0; i < nb / 2; i++) {
- c = *p;
- *p++ = *q;
- *q-- = c;
- }
- *out += nb;
- /* Pad with zeroes if we have to */
- if (len > 0) {
- len -= nb;
- if (len > 0) {
- memset(*out, 0, len);
- *out += len;
- }
- }
+ BN_bn2lebinpad(bn, *out, len);
+ *out += len;
}
static int check_bitlen_rsa(RSA *rsa, int ispub, unsigned int *magic);