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[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>
This commit is contained in:
Felix Beck 2011-01-05 12:47:48 +01:00 committed by Martin Schwidefsky
parent c2567f8ffa
commit 078f8ecaa3
1 changed files with 10 additions and 2 deletions
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12
drivers/s390/crypto/zcrypt_api.c
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@ -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 -