In the keypair consistency check for encryption/decryption keys, a key

that was very small (with max_input_size() == 0) would underflow and cause
an attempted allocation of a 4 gigabyte input string.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/keypair.cpp b/src/keypair.cpp
index 11ddbd811..eb613b971 100644
--- a/src/keypair.cpp
+++ b/src/keypair.cpp
@@ -17,6 +17,9 @@ namespace KeyPair {
 *************************************************/
 void check_key(PK_Encryptor* encryptor, PK_Decryptor* decryptor)
    {
+   if(encryptor->maximum_input_size() == 0)
+      return;
+
    std::auto_ptr<PK_Encryptor> enc(encryptor);
    std::auto_ptr<PK_Decryptor> dec(decryptor);