build, lib, ipcpd, irmd: Add support for libgcrypt

This adds support for libgcrypt. If at least version 1.7.0 of
libgcrypt is present, it may be used for secure random number
generation and is used for hashing in the irmd/ipcp.

The hash definitions are moved to the internal hash.h header, and
defined independently of the hashes that are defined as part of the
directory policy for the normal IPCP. The translation is moved from
the IRMd to ipcpd/ipcp.h. The bootstrap call from the IRMd expects the
IPCP to return the correct hash algorithm with a dif_info struct,
which is in line with the behavior of the enroll call.

This also improves how some platform checks in the build system are
handled.

1 files changed, 17 insertions, 3 deletions

diff --git a/src/irmd/ipcp.c b/src/irmd/ipcp.c
index bf71bc3d..528e90a2 100644
--- a/src/irmd/ipcp.c
+++ b/src/irmd/ipcp.c
@@ -206,8 +206,9 @@ int ipcp_destroy(pid_t api)
         return 0;
 }
 
-int ipcp_bootstrap(pid_t              api,
-                   ipcp_config_msg_t * conf)
+int ipcp_bootstrap(pid_t               api,
+                   ipcp_config_msg_t * conf,
+                   struct dif_info   * info)
 {
         ipcp_msg_t   msg      = IPCP_MSG__INIT;
         ipcp_msg_t * recv_msg = NULL;
@@ -229,6 +230,20 @@ int ipcp_bootstrap(pid_t              api,
         }
 
         ret = recv_msg->result;
+        if (ret != 0) {
+                ipcp_msg__free_unpacked(recv_msg, NULL);
+                return ret;
+        }
+
+        if (recv_msg->dif_info == NULL) {
+                ipcp_msg__free_unpacked(recv_msg, NULL);
+                return -EIPCP;
+        }
+
+        info->dir_hash_algo = recv_msg->dif_info->dir_hash_algo;
+        strcpy(info->dif_name, recv_msg->dif_info->dif_name);
+
+        ret = recv_msg->result;
         ipcp_msg__free_unpacked(recv_msg, NULL);
 
         return ret;
@@ -269,7 +284,6 @@ int ipcp_enroll(pid_t             api,
         }
 
         info->dir_hash_algo = recv_msg->dif_info->dir_hash_algo;
-
         strcpy(info->dif_name, recv_msg->dif_info->dif_name);
 
         ipcp_msg__free_unpacked(recv_msg, NULL);