Define session cloning interface

3 files changed, 7 insertions, 0 deletions

diff --git a/crypto.4 b/crypto.4
index 0dc21e9..04d952e 100644
--- a/crypto.4
+++ b/crypto.4
@@ -543,6 +543,11 @@ For RSA with \fBRSA_PKCS1_PSS\fP.
 An 32-bit unsigned integer in native byte order
 specifying the PSS salt length.
 Optional, defaults to 0.
+.IP \fBNCR_ATTR_SESSION_CLONE_FROM\fP
+Optional, a 32-bit unsigned integer in native byte order
+specifying session state to clone.
+Only supported for some operations and algorithms;
+specifically intended for cloning hashing sessions.
 .IP \fBNCR_ATTR_SIGNATURE_HASH_ALGORITHM\fP
 Mandatory for some operations and algorithms.
 A NUL-terminated string specifying a hash algorithm underlying a signature,
diff --git a/ncr.h b/ncr.h
index 47981d1..3c416eb 100644
--- a/ncr.h
+++ b/ncr.h
@@ -58,6 +58,7 @@ enum {
 	NCR_ATTR_DH_BASE,	      /* NLA_BINARY */
 	NCR_ATTR_DH_PUBLIC,	      /* NLA_BINARY */
 	NCR_ATTR_WANTED_ATTRS,	      /* NLA_BINARY - array of u16 IDs */
+	NCR_ATTR_SESSION_CLONE_FROM,  /* NLA_U32 - ncr_session_t */
 
 	/* Add new attributes here */
 
diff --git a/utils.c b/utils.c
index 514833c..a427833 100644
--- a/utils.c
+++ b/utils.c
@@ -82,6 +82,7 @@ static const struct nla_policy ncr_attr_policy[NCR_ATTR_MAX + 1] = {
 	[NCR_ATTR_DH_BASE] = { NLA_BINARY, 0 },
 	[NCR_ATTR_DH_PUBLIC] = { NLA_BINARY, 0 },
 	[NCR_ATTR_WANTED_ATTRS] = { NLA_BINARY, 0 },
+	[NCR_ATTR_SESSION_CLONE_FROM] = { NLA_U32, 0 },
 };
 
 void *__ncr_get_input_args(void *fixed, struct nlattr *tb[], size_t fixed_size,