- fix cli arg parse

[oweals/gnunet.git] / src / util / crypto_paillier.c

diff --git a/src/util/crypto_paillier.c b/src/util/crypto_paillier.c
index d478239053f1fe148113ae71052a518039c20b72..eb5bfe87c4353a9892c61f3bef0bff2a8dafca3e 100644 (file)
--- a/src/util/crypto_paillier.c
+++ b/src/util/crypto_paillier.c
@@ -92,12 +92,16 @@ GNUNET_CRYPTO_paillier_create (struct GNUNET_CRYPTO_PaillierPublicKey *public_ke
  *
  * @param public_key Public key to use.
  * @param m Plaintext to encrypt.
+ * @param desired_ops How many homomorphic ops the caller intends to use
  * @param[out] ciphertext Encrytion of @a plaintext with @a public_key.
- * @return guaranteed number of supported homomorphic operations, can be zero
+ * @return guaranteed number of supported homomorphic operations >= 1, 
+ *         or desired_ops, in case that is lower,
+ *         or -1 if less than one homomorphic operation is possible
  */
 int
 GNUNET_CRYPTO_paillier_encrypt (const struct GNUNET_CRYPTO_PaillierPublicKey *public_key,
                                 const gcry_mpi_t m,
+                                int desired_ops,
                                 struct GNUNET_CRYPTO_PaillierCiphertext *ciphertext)
 {
   int possible_opts;
@@ -127,6 +131,9 @@ GNUNET_CRYPTO_paillier_encrypt (const struct GNUNET_CRYPTO_PaillierPublicKey *pu
   
   if (possible_opts < 1)
     possible_opts = 0;
+  //soft-cap by caller
+  possible_opts = (desired_ops < possible_opts)? desired_ops : possible_opts;
+  
   ciphertext->remaining_ops = htonl (possible_opts);
 
   GNUNET_assert (0 != (n_square = gcry_mpi_new (0)));