From 078f8ecaa30718694d1e13d9f415b7ce75b3c968 Mon Sep 17 00:00:00 2001 From: Felix Beck Date: Wed, 5 Jan 2011 12:47:48 +0100 Subject: [PATCH] [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 Signed-off-by: Martin Schwidefsky --- drivers/s390/crypto/zcrypt_api.c | 12 ++++++++++-- 1 file 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 - -- 2.20.1