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authorRalph Wuerthner <rwuerthn@de.ibm.com>2008-04-17 07:46:15 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2008-04-17 07:47:02 +0200
commit2f7c8bd6dc6540aa3275c0ad9f657401985c00e9 (patch)
tree12cb12d661424d332ad960113c8849b3579e7e6a /drivers/s390/crypto/zcrypt_api.h
parent893f11286644780fc7d6d415e537644da7bdaaf8 (diff)
[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 <rwuerthn@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'drivers/s390/crypto/zcrypt_api.h')
-rw-r--r--drivers/s390/crypto/zcrypt_api.h8
1 files changed, 8 insertions, 0 deletions
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 {