1 files changed, 22 insertions, 0 deletions
diff --git a/crypto/signature_creator_openssl.cc b/crypto/signature_creator_openssl.cc
index fa9ba07..e46d3d0 100644
--- a/crypto/signature_creator_openssl.cc
+++ b/crypto/signature_creator_openssl.cc
@@ -5,6 +5,7 @@
 #include "crypto/signature_creator.h"
 
 #include <openssl/evp.h>
+#include <openssl/rsa.h>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ -24,6 +25,27 @@ SignatureCreator* SignatureCreator::Create(RSAPrivateKey* key) {
   return result.release();
 }
 
+// static
+bool SignatureCreator::Sign(RSAPrivateKey* key,
+                            const uint8* data,
+                            int data_len,
+                            std::vector<uint8>* signature) {
+  RSA* rsa_key = EVP_PKEY_get1_RSA(key->key());
+  if (!rsa_key)
+    return false;
+  signature->resize(RSA_size(rsa_key));
+
+  unsigned int len = 0;
+  bool success = RSA_sign(NID_sha1, data, data_len, vector_as_array(signature),
+                          &len, rsa_key);
+  if (!success) {
+    signature->clear();
+    return false;
+  }
+  signature->resize(len);
+  return true;
+}
+
 SignatureCreator::SignatureCreator()
     : sign_context_(EVP_MD_CTX_create()) {
 }