gpg_error_t
gcry_cipher_setctr (gcry_cipher_hd_t hd, const void *ctr, size_t ctrlen)
{
if (!fips_is_operational ())
return gpg_error (fips_not_operational ());
return gcry_error (_gcry_cipher_setctr (hd, ctr, ctrlen));
}
gcry_error_t
gcry_cipher_ctl( gcry_cipher_hd_t h, int cmd, void *buffer, size_t buflen)
{
gcry_err_code_t rc = GPG_ERR_NO_ERROR;
switch (cmd)
{
case GCRYCTL_SET_KEY: /* Deprecated; use gcry_cipher_setkey. */
rc = cipher_setkey( h, buffer, buflen );
break;
case GCRYCTL_SET_IV: /* Deprecated; use gcry_cipher_setiv. */
cipher_setiv( h, buffer, buflen );
break;
case GCRYCTL_RESET:
cipher_reset (h);
break;
case GCRYCTL_CFB_SYNC:
cipher_sync( h );
break;
case GCRYCTL_SET_CBC_CTS:
if (buflen)
if (h->flags & GCRY_CIPHER_CBC_MAC)
rc = GPG_ERR_INV_FLAG;
else
h->flags |= GCRY_CIPHER_CBC_CTS;
else
h->flags &= ~GCRY_CIPHER_CBC_CTS;
break;
case GCRYCTL_SET_CBC_MAC:
if (buflen)
if (h->flags & GCRY_CIPHER_CBC_CTS)
rc = GPG_ERR_INV_FLAG;
else
h->flags |= GCRY_CIPHER_CBC_MAC;
else
h->flags &= ~GCRY_CIPHER_CBC_MAC;
break;
case GCRYCTL_DISABLE_ALGO:
/* This command expects NULL for H and BUFFER to point to an
integer with the algo number. */
if( h || !buffer || buflen != sizeof(int) )
return gcry_error (GPG_ERR_CIPHER_ALGO);
disable_cipher_algo( *(int*)buffer );
break;
case GCRYCTL_SET_CTR: /* Deprecated; use gcry_cipher_setctr. */
rc = gpg_err_code (_gcry_cipher_setctr (h, buffer, buflen));
break;
case 61: /* Disable weak key detection (private). */
if (h->extraspec->set_extra_info)
rc = h->extraspec->set_extra_info
(&h->context.c, CIPHER_INFO_NO_WEAK_KEY, NULL, 0);
else
rc = GPG_ERR_NOT_SUPPORTED;
break;
case 62: /* Return current input vector (private). */
/* This is the input block as used in CFB and OFB mode which has
initially been set as IV. The returned format is:
1 byte Actual length of the block in bytes.
n byte The block.
If the provided buffer is too short, an error is returned. */
if (buflen < (1 + h->cipher->blocksize))
rc = GPG_ERR_TOO_SHORT;
else
{
unsigned char *ivp;
unsigned char *dst = buffer;
int n = h->unused;
if (!n)
n = h->cipher->blocksize;
gcry_assert (n <= h->cipher->blocksize);
*dst++ = n;
ivp = h->u_iv.iv + h->cipher->blocksize - n;
while (n--)
*dst++ = *ivp++;
}
break;
default:
rc = GPG_ERR_INV_OP;
}
return gcry_error (rc);
}
