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authorFelix Beck <felix.beck@de.ibm.com>2011-01-05 12:47:48 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2011-01-05 12:47:27 +0100
commit078f8ecaa30718694d1e13d9f415b7ce75b3c968 (patch)
tree3cbb3ac8af8db120fdecdf8e2f35c2ae6c5f1a86 /drivers/s390/crypto
parentc2567f8ffa2704f6f2f81013e9a590deca5a865f (diff)
[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: Felix Beck <felix.beck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/crypto')
-rw-r--r--drivers/s390/crypto/zcrypt_api.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index 7fca9c10ffcf..8e65447f76b7 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/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 -