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s390/zcrypt: msgType50 (RSA-CRT) fix

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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>
This commit is contained in:
Ingo Tuchscherer 2012-10-31 10:38:15 +01:00 • committed by Martin Schwidefsky
parent a4f32bdbd9
commit 1e466fcf38
2 changed files with 29 additions and 41 deletions
Download patch file Download diff file Expand all files Collapse all files

68
drivers/s390/crypto/zcrypt_msgtype50.c
View file

@ -241,84 +241,70 @@ static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_device *zdev,
struct ap_message *ap_msg, struct ap_message *ap_msg,
struct ica_rsa_modexpo_crt *crt) 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; unsigned char *p, *q, *dp, *dq, *u, *inp;
mod_len = crt->inputdatalength; mod_len = crt->inputdatalength;
short_len = mod_len / 2; short_len = mod_len / 2;
long_len = mod_len / 2 + 8;
/* /*
* CEX2A cannot handle p, dp, or U > 128 bytes. * CEX2A and CEX3A w/o FW update can handle requests up to
* If we have one of these, we need to do extra checking. * 256 byte modulus (2k keys).
* For CEX3A the limit is 256 bytes. * 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) if (mod_len <= 128) { /* up to 1024 bit key 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) {
struct type50_crb1_msg *crb1 = ap_msg->message; struct type50_crb1_msg *crb1 = ap_msg->message;
memset(crb1, 0, sizeof(*crb1)); memset(crb1, 0, sizeof(*crb1));
ap_msg->length = sizeof(*crb1); ap_msg->length = sizeof(*crb1);
crb1->header.msg_type_code = TYPE50_TYPE_CODE; crb1->header.msg_type_code = TYPE50_TYPE_CODE;
crb1->header.msg_len = sizeof(*crb1); crb1->header.msg_len = sizeof(*crb1);
crb1->keyblock_type = TYPE50_CRB1_FMT; 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; 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; 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; 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; struct type50_crb2_msg *crb2 = ap_msg->message;
memset(crb2, 0, sizeof(*crb2)); memset(crb2, 0, sizeof(*crb2));
ap_msg->length = sizeof(*crb2); ap_msg->length = sizeof(*crb2);
crb2->header.msg_type_code = TYPE50_TYPE_CODE; crb2->header.msg_type_code = TYPE50_TYPE_CODE;
crb2->header.msg_len = sizeof(*crb2); crb2->header.msg_len = sizeof(*crb2);
crb2->keyblock_type = TYPE50_CRB2_FMT; 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; 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; 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; inp = crb2->message + sizeof(crb2->message) - mod_len;
} else { } else if ((mod_len <= 512) && /* up to 4096 bit key size */
/* long_len >= 256 */ (zdev->max_mod_size == CEX3A_MAX_MOD_SIZE)) { /* >= CEX3A */
struct type50_crb3_msg *crb3 = ap_msg->message; struct type50_crb3_msg *crb3 = ap_msg->message;
memset(crb3, 0, sizeof(*crb3)); memset(crb3, 0, sizeof(*crb3));
ap_msg->length = sizeof(*crb3); ap_msg->length = sizeof(*crb3);
crb3->header.msg_type_code = TYPE50_TYPE_CODE; crb3->header.msg_type_code = TYPE50_TYPE_CODE;
crb3->header.msg_len = sizeof(*crb3); crb3->header.msg_len = sizeof(*crb3);
crb3->keyblock_type = TYPE50_CRB3_FMT; 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; 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; 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; 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(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(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)) copy_from_user(inp, crt->inputdata, mod_len))
return -EFAULT; return -EFAULT;

2
drivers/s390/crypto/zcrypt_msgtype50.h
View file

@ -33,6 +33,8 @@
#define MSGTYPE50_CRB2_MAX_MSG_SIZE 0x390 /*sizeof(struct type50_crb2_msg)*/ #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 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); int zcrypt_msgtype50_init(void);
void zcrypt_msgtype50_exit(void); void zcrypt_msgtype50_exit(void);