[S390] Handling of 4096 bit RSA keys in CRT format.

Also process 4096 bit RSA keys in CRT format. Handle them like the
smaller keys and take care of the zero padding.
Signed-off-by: NFelix Beck <felix.beck@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/crypto/zcrypt_api.c

@@ -396,8 +396,15 @@ static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
 			if (copied == 0) {
 				unsigned int len;
 				spin_unlock_bh(&zcrypt_device_lock);
-				/* len is max 256 / 2 - 120 = 8 */
-				len = crt->inputdatalength / 2 - 120;
+				/* len is max 256 / 2 - 120 = 8
+				 * For bigger device just assume len of leading
+				 * 0s is 8 as stated in the requirements for
+				 * ica_rsa_modexpo_crt struct in zcrypt.h.
+				 */
+				if (crt->inputdatalength <= 256)
+					len = crt->inputdatalength / 2 - 120;
+				else
+					len = 8;
 				if (len > sizeof(z1))
 					return -EFAULT;
 				z1 = z2 = z3 = 0;
@@ -405,6 +412,7 @@ static long zcrypt_rsa_crt(struct ica_rsa_modexpo_crt *crt)
 				    copy_from_user(&z2, crt->bp_key, len) ||
 				    copy_from_user(&z3, crt->u_mult_inv, len))
 					return -EFAULT;
+				z1 = z2 = z3 = 0;
 				copied = 1;
 				/*
 				 * We have to restart device lookup -