[GNUnet-SVN] r31957 - in gnunet/src: include secretsharing

[gnunet]

Author: dold
Date: 2014-01-20 20:59:22 +0100 (Mon, 20 Jan 2014)
New Revision: 31957

Modified:
   gnunet/src/include/gnunet_crypto_lib.h
   gnunet/src/secretsharing/gnunet-service-secretsharing.c
Log:
- paillier


Modified: gnunet/src/include/gnunet_crypto_lib.h
===================================================================
--- gnunet/src/include/gnunet_crypto_lib.h      2014-01-20 19:08:47 UTC (rev 
31956)
+++ gnunet/src/include/gnunet_crypto_lib.h      2014-01-20 19:59:22 UTC (rev 
31957)
@@ -330,6 +330,65 @@
 };
 
 
+/**
+ * Size of paillier plain texts and public keys.
+ * Private keys and ciphertexts are twice this size.
+ */
+#define GNUNET_CRYPTO_PAILLIER_BITS 2048
+
+
+/**
+ * Paillier public key.
+ */
+struct GNUNET_CRYPTO_PaillierPublicKey
+{
+  /**
+   * N value.
+   */
+  unsigned char n[GNUNET_CRYPTO_PAILLIER_BITS / 8];
+};
+
+
+/**
+ * Paillier public key.
+ */
+struct GNUNET_CRYPTO_PaillierPrivateKey
+{
+  /**
+   * Lambda-component of the private key.
+   */
+  unsigned char lambda[GNUNET_CRYPTO_PAILLIER_BITS / 8];
+  /**
+   * Mu-component of the private key.
+   */
+  unsigned char mu[GNUNET_CRYPTO_PAILLIER_BITS / 8];
+};
+
+
+/**
+ * Paillier plaintext.
+ */
+struct GNUNET_CRYPTO_PaillierPlaintext
+{
+  /**
+   * The bits of the plaintext.
+   */
+  unsigned char bits[GNUNET_CRYPTO_PAILLIER_BITS / 8];
+};
+
+
+/**
+ * Paillier ciphertext.
+ */
+struct GNUNET_CRYPTO_PaillierCiphertext
+{
+  /**
+   * The bits of the ciphertext.
+   */
+  unsigned char bits[GNUNET_CRYPTO_PAILLIER_BITS * 2 / 8];
+};
+
+
 /* **************** Functions and Macros ************* */
 
 /**
@@ -1262,6 +1321,62 @@
                                  size_t size);
 
 
+/**
+ * Create a freshly generated paillier public key.
+ *
+ * @param[out] public_key Where to store the public key?
+ * @param[out] private_key Where to store the private key?
+ */
+void
+GNUNET_CRYPTO_paillier_create (struct GNUNET_CRYPTO_PaillierPublicKey 
*public_key,
+                               struct GNUNET_CRYPTO_PaillierPrivateKey 
*private_key);
+
+
+/**
+ * Encrypt a plaintext with a paillier public key.
+ *
+ * @param public_key Public key to use.
+ * @param plaintext Plaintext to encrypt.
+ * @param[out] ciphertext Encrytion of @a plaintext with @a public_key.
+ */
+void
+GNUNET_CRYPTO_paillier_encrypt (const struct GNUNET_CRYPTO_PaillierPublicKey 
*public_key,
+                                const struct GNUNET_CRYPTO_PaillierPlaintext 
*plaintext,
+                                struct GNUNET_CRYPTO_PaillierCiphertext 
*ciphertext);
+
+
+/**
+ * Decrypt a paillier ciphertext with a private key.
+ *
+ * @param private_key Private key to use for encryption.
+ * @param ciphertext Ciphertext to decrypt.
+ * @param[out] plaintext Decryption of @a ciphertext with @private_key.
+ */
+void
+GNUNET_CRYPTO_paillier_decrypt (const struct GNUNET_CRYPTO_PaillierPrivateKey 
*private_key,
+                                const struct GNUNET_CRYPTO_PaillierCiphertext 
*ciphertext,
+                                struct GNUNET_CRYPTO_PaillierPlaintext 
*plaintext);
+
+
+/**
+ * Compute a ciphertext that represents the sum of the plaintext in @a x1 and 
@a x2
+ *
+ * Note that this operation can only be done a finite number of times
+ * before an overflow occurs.
+ *
+ * @param x1 Paillier cipher text.
+ * @param x2 Paillier cipher text.
+ * @param[out] result Result of the homomorphic operation.
+ * @return GNUNET_OK if the result could be computed,
+ *         GNUNET_SYSERR if no more homomorphic operations are remaining.
+ */
+int
+GNUNET_CRYPTO_paillier_hom_add (const struct GNUNET_CRYPTO_PaillierCiphertext 
*x1,
+                                const struct GNUNET_CRYPTO_PaillierCiphertext 
*x2,
+                                const struct GNUNET_CRYPTO_PaillierCiphertext 
*result);
+
+
+
 #if 0                           /* keep Emacsens' auto-indent happy */
 {
 #endif

Modified: gnunet/src/secretsharing/gnunet-service-secretsharing.c
===================================================================
--- gnunet/src/secretsharing/gnunet-service-secretsharing.c     2014-01-20 
19:08:47 UTC (rev 31956)
+++ gnunet/src/secretsharing/gnunet-service-secretsharing.c     2014-01-20 
19:59:22 UTC (rev 31957)
@@ -348,7 +348,7 @@
 /**
  * Get the peer info belonging to a peer identity in a decrypt session.
  *
- * @param ks The decrypt session.
+ * @param ds The decrypt session.
  * @param peer The peer identity.
  * @return The decrypt peer info, or NULL if the peer could not be found.
  */
@@ -546,8 +546,8 @@
   gcry_mpi_t phi;
   gcry_mpi_t tmp;
 
-  GNUNET_assert (0 != (phi = gcry_mpi_new (PAILLIER_BITS)));
-  GNUNET_assert (0 != (tmp = gcry_mpi_new (PAILLIER_BITS)));
+  GNUNET_assert (NULL != (phi = gcry_mpi_new (PAILLIER_BITS)));
+  GNUNET_assert (NULL != (tmp = gcry_mpi_new (PAILLIER_BITS)));
 
   p = q = NULL;