s390/zcrypt: msgType50 (RSA-CRT) fix

The message request handling (type50 - clear key) for RSA operations
(in CRT format) are now handled correctly with respect to the crb
format container.

Signed-off-by: Ingo Tuchscherer <ingo.tuchscherer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/crypto/zcrypt_msgtype50.c b/drivers/s390/crypto/zcrypt_msgtype50.c
index 035b6dc..7c522f3 100644 (file)
--- a/drivers/s390/crypto/zcrypt_msgtype50.c
+++ b/drivers/s390/crypto/zcrypt_msgtype50.c
@@ -241,84 +241,70 @@ static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_device *zdev,
                                       struct ap_message *ap_msg,
                                       struct ica_rsa_modexpo_crt *crt)
 {
-       int mod_len, short_len, long_len, long_offset, limit;
+       int mod_len, short_len;
        unsigned char *p, *q, *dp, *dq, *u, *inp;
 
        mod_len = crt->inputdatalength;
        short_len = mod_len / 2;
-       long_len = mod_len / 2 + 8;
 
        /*
-        * CEX2A cannot handle p, dp, or U > 128 bytes.
-        * If we have one of these, we need to do extra checking.
-        * For CEX3A the limit is 256 bytes.
+        * CEX2A and CEX3A w/o FW update can handle requests up to
+        * 256 byte modulus (2k keys).
+        * CEX3A with FW update and CEX4A cards are able to handle
+        * 512 byte modulus (4k keys).
         */
-       if (zdev->max_mod_size == CEX3A_MAX_MOD_SIZE)
-               limit = 256;
-       else
-               limit = 128;
-
-       if (long_len > limit) {
-               /*
-                * zcrypt_rsa_crt already checked for the leading
-                * zeroes of np_prime, bp_key and u_mult_inc.
-                */
-               long_offset = long_len - limit;
-               long_len = limit;
-       } else
-               long_offset = 0;
-
-       /*
-        * Instead of doing extra work for p, dp, U > 64 bytes, we'll just use
-        * the larger message structure.
-        */
-       if (long_len <= 64) {
+       if (mod_len <= 128) {           /* up to 1024 bit key size */
                struct type50_crb1_msg *crb1 = ap_msg->message;
                memset(crb1, 0, sizeof(*crb1));
                ap_msg->length = sizeof(*crb1);
                crb1->header.msg_type_code = TYPE50_TYPE_CODE;
                crb1->header.msg_len = sizeof(*crb1);
                crb1->keyblock_type = TYPE50_CRB1_FMT;
-               p = crb1->p + sizeof(crb1->p) - long_len;
+               p = crb1->p + sizeof(crb1->p) - short_len;
                q = crb1->q + sizeof(crb1->q) - short_len;
-               dp = crb1->dp + sizeof(crb1->dp) - long_len;
+               dp = crb1->dp + sizeof(crb1->dp) - short_len;
                dq = crb1->dq + sizeof(crb1->dq) - short_len;
-               u = crb1->u + sizeof(crb1->u) - long_len;
+               u = crb1->u + sizeof(crb1->u) - short_len;
                inp = crb1->message + sizeof(crb1->message) - mod_len;
-       } else if (long_len <= 128) {
+       } else if (mod_len <= 256) {    /* up to 2048 bit key size */
                struct type50_crb2_msg *crb2 = ap_msg->message;
                memset(crb2, 0, sizeof(*crb2));
                ap_msg->length = sizeof(*crb2);
                crb2->header.msg_type_code = TYPE50_TYPE_CODE;
                crb2->header.msg_len = sizeof(*crb2);
                crb2->keyblock_type = TYPE50_CRB2_FMT;
-               p = crb2->p + sizeof(crb2->p) - long_len;
+               p = crb2->p + sizeof(crb2->p) - short_len;
                q = crb2->q + sizeof(crb2->q) - short_len;
-               dp = crb2->dp + sizeof(crb2->dp) - long_len;
+               dp = crb2->dp + sizeof(crb2->dp) - short_len;
                dq = crb2->dq + sizeof(crb2->dq) - short_len;
-               u = crb2->u + sizeof(crb2->u) - long_len;
+               u = crb2->u + sizeof(crb2->u) - short_len;
                inp = crb2->message + sizeof(crb2->message) - mod_len;
-       } else {
-               /* long_len >= 256 */
+       } else if ((mod_len <= 512) &&  /* up to 4096 bit key size */
+                  (zdev->max_mod_size == CEX3A_MAX_MOD_SIZE)) { /* >= CEX3A */
                struct type50_crb3_msg *crb3 = ap_msg->message;
                memset(crb3, 0, sizeof(*crb3));
                ap_msg->length = sizeof(*crb3);
                crb3->header.msg_type_code = TYPE50_TYPE_CODE;
                crb3->header.msg_len = sizeof(*crb3);
                crb3->keyblock_type = TYPE50_CRB3_FMT;
-               p = crb3->p + sizeof(crb3->p) - long_len;
+               p = crb3->p + sizeof(crb3->p) - short_len;
                q = crb3->q + sizeof(crb3->q) - short_len;
-               dp = crb3->dp + sizeof(crb3->dp) - long_len;
+               dp = crb3->dp + sizeof(crb3->dp) - short_len;
                dq = crb3->dq + sizeof(crb3->dq) - short_len;
-               u = crb3->u + sizeof(crb3->u) - long_len;
+               u = crb3->u + sizeof(crb3->u) - short_len;
                inp = crb3->message + sizeof(crb3->message) - mod_len;
-       }
+       } else
+               return -EINVAL;
 
-       if (copy_from_user(p, crt->np_prime + long_offset, long_len) ||
+       /*
+        * correct the offset of p, bp and mult_inv according zcrypt.h
+        * block size right aligned (skip the first byte)
+        */
+       if (copy_from_user(p, crt->np_prime + MSGTYPE_ADJUSTMENT, short_len) ||
            copy_from_user(q, crt->nq_prime, short_len) ||
-           copy_from_user(dp, crt->bp_key + long_offset, long_len) ||
+           copy_from_user(dp, crt->bp_key + MSGTYPE_ADJUSTMENT, short_len) ||
            copy_from_user(dq, crt->bq_key, short_len) ||
-           copy_from_user(u, crt->u_mult_inv + long_offset, long_len) ||
+           copy_from_user(u, crt->u_mult_inv + MSGTYPE_ADJUSTMENT, short_len) ||
            copy_from_user(inp, crt->inputdata, mod_len))
                return -EFAULT;
 

diff --git a/drivers/s390/crypto/zcrypt_msgtype50.h b/drivers/s390/crypto/zcrypt_msgtype50.h
index e56dc72..0a66e4a 100644 (file)
--- a/drivers/s390/crypto/zcrypt_msgtype50.h
+++ b/drivers/s390/crypto/zcrypt_msgtype50.h
@@ -33,6 +33,8 @@
 #define MSGTYPE50_CRB2_MAX_MSG_SIZE    0x390 /*sizeof(struct type50_crb2_msg)*/
 #define MSGTYPE50_CRB3_MAX_MSG_SIZE    0x710 /*sizeof(struct type50_crb3_msg)*/
 
+#define MSGTYPE_ADJUSTMENT             0x08  /*type04 extension (not needed in type50)*/
+
 int zcrypt_msgtype50_init(void);
 void zcrypt_msgtype50_exit(void);