From 2f7c8bd6dc6540aa3275c0ad9f657401985c00e9 Mon Sep 17 00:00:00 2001 From: Ralph Wuerthner Date: Thu, 17 Apr 2008 07:46:15 +0200 Subject: [S390] zcrypt: add support for large random numbers This patch allows user space applications to access large amounts of truly random data. The random data source is the build-in hardware random number generator on the CEX2C cards. Signed-off-by: Ralph Wuerthner Signed-off-by: Martin Schwidefsky Signed-off-by: Heiko Carstens --- drivers/s390/crypto/zcrypt_api.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/s390/crypto/zcrypt_api.h') diff --git a/drivers/s390/crypto/zcrypt_api.h b/drivers/s390/crypto/zcrypt_api.h index de4877ee618..0e948528a73 100644 --- a/drivers/s390/crypto/zcrypt_api.h +++ b/drivers/s390/crypto/zcrypt_api.h @@ -100,6 +100,13 @@ struct ica_z90_status { #define ZCRYPT_CEX2C 5 #define ZCRYPT_CEX2A 6 +/** + * Large random numbers are pulled in 4096 byte chunks from the crypto cards + * and stored in a page. Be carefull when increasing this buffer due to size + * limitations for AP requests. + */ +#define ZCRYPT_RNG_BUFFER_SIZE 4096 + struct zcrypt_device; struct zcrypt_ops { @@ -107,6 +114,7 @@ struct zcrypt_ops { long (*rsa_modexpo_crt)(struct zcrypt_device *, struct ica_rsa_modexpo_crt *); long (*send_cprb)(struct zcrypt_device *, struct ica_xcRB *); + long (*rng)(struct zcrypt_device *, char *); }; struct zcrypt_device { -- cgit v1.2.3-18-g5258