pki: Add ssh_pki_export_signature_blob().

1 files changed, 56 insertions, 0 deletions

diff --git a/src/pki.c b/src/pki.c
index effeb70..f776938 100644
--- a/src/pki.c
+++ b/src/pki.c
@@ -857,6 +857,62 @@ int ssh_pki_export_pubkey_file(const ssh_key key,
     return SSH_OK;
 }
 
+int ssh_pki_export_signature_blob(const ssh_signature sig,
+                                  ssh_string *sig_blob)
+{
+    ssh_buffer buf = NULL;
+    ssh_string str;
+    int rc;
+
+    if (sig == NULL || sig_blob == NULL) {
+        return SSH_ERROR;
+    }
+
+    buf = ssh_buffer_new();
+    if (buf == NULL) {
+        return SSH_ERROR;
+    }
+
+    str = ssh_string_from_char(ssh_key_type_to_char(sig->type));
+    if (str == NULL) {
+        ssh_buffer_free(buf);
+        return SSH_ERROR;
+    }
+
+    rc = buffer_add_ssh_string(buf, str);
+    ssh_string_free(str);
+    if (rc < 0) {
+        ssh_buffer_free(buf);
+        return SSH_ERROR;
+    }
+
+    str = pki_signature_to_blob(sig);
+    if (str == NULL) {
+        ssh_buffer_free(buf);
+        return SSH_ERROR;
+    }
+
+    rc = buffer_add_ssh_string(buf, str);
+    ssh_string_free(str);
+    if (rc < 0) {
+        ssh_buffer_free(buf);
+        return SSH_ERROR;
+    }
+
+    str = ssh_string_new(buffer_get_rest_len(buf));
+    if (str == NULL) {
+        ssh_buffer_free(buf);
+        return SSH_ERROR;
+    }
+
+    ssh_string_fill(str, buffer_get_rest(buf), buffer_get_rest_len(buf));
+    ssh_buffer_free(buf);
+
+    *sig_blob = str;
+
+    return SSH_OK;
+}
+
 /*
  * This function signs the session id (known as H) as a string then
  * the content of sigbuf */