You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
#include "gnunet_common.h"
#include <gcrypt.h>
-/**
- * We need this enum here, but not the entire scheduler API.
- * For the full definition, see gnunet_scheduler_lib.h.
- */
-enum GNUNET_SCHEDULER_Priority;
/**
* @brief A 512-bit hashcode
const struct GNUNET_PeerIdentity *second);
+/**
+ * Internal structure used to cache pre-calculated values for DLOG calculation.
+ */
+struct GNUNET_CRYPTO_EccDlogContext;
+
+
+/**
+ * Point on a curve (always for Curve25519) encoded in a format suitable
+ * for network transmission (ECDH), see http://cr.yp.to/ecdh.html.
+ */
+struct GNUNET_CRYPTO_EccPoint
+{
+ /**
+ * Q consists of an x- and a y-value, each mod p (256 bits), given
+ * here in affine coordinates and Ed25519 standard compact format.
+ */
+ unsigned char q_y[256 / 8];
+};
+
+
+/**
+ * Do pre-calculation for ECC discrete logarithm for small factors.
+ *
+ * @param max maximum value the factor can be
+ * @param mem memory to use (should be smaller than @a max), must not be zero.
+ * @return @a max if dlog failed, otherwise the factor
+ */
+struct GNUNET_CRYPTO_EccDlogContext *
+GNUNET_CRYPTO_ecc_dlog_prepare (unsigned int max,
+ unsigned int mem);
+
+
+/**
+ * Calculate ECC discrete logarithm for small factors.
+ * Opposite of #GNUNET_CRYPTO_ecc_dexp().
+ *
+ * @param dlc precalculated values, determine range of factors
+ * @param input point on the curve to factor
+ * @return `dlc->max` if dlog failed, otherwise the factor
+ */
+int
+GNUNET_CRYPTO_ecc_dlog (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t input);
+
+
+/**
+ * Multiply the generator g of the elliptic curve by @a val
+ * to obtain the point on the curve representing @a val.
+ * Afterwards, point addition will correspond to integer
+ * addition. #GNUNET_CRYPTO_ecc_dlog() can be used to
+ * convert a point back to an integer (as long as the
+ * integer is smaller than the MAX of the @a edc context).
+ *
+ * @param edc calculation context for ECC operations
+ * @param val value to encode into a point
+ * @return representation of the value as an ECC point,
+ * must be freed using #GNUNET_CRYPTO_ecc_free()
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_dexp (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ int val);
+
+
+/**
+ * Multiply the generator g of the elliptic curve by @a val
+ * to obtain the point on the curve representing @a val.
+ *
+ * @param edc calculation context for ECC operations
+ * @param val (positive) value to encode into a point
+ * @return representation of the value as an ECC point,
+ * must be freed using #GNUNET_CRYPTO_ecc_free()
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_dexp_mpi (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_t val);
+
+
+/**
+ * Multiply the point @a p on the elliptic curve by @a val.
+ *
+ * @param edc calculation context for ECC operations
+ * @param p point to multiply
+ * @param val (positive) value to encode into a point
+ * @return representation of the value as an ECC point,
+ * must be freed using #GNUNET_CRYPTO_ecc_free()
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_pmul_mpi (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t p,
+ gcry_mpi_t val);
+
+
+/**
+ * Convert point value to binary representation.
+ *
+ * @param edc calculation context for ECC operations
+ * @param point computational point representation
+ * @param[out] bin binary point representation
+ */
+void
+GNUNET_CRYPTO_ecc_point_to_bin (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t point,
+ struct GNUNET_CRYPTO_EccPoint *bin);
+
+
+/**
+ * Convert binary representation of a point to computational representation.
+ *
+ * @param edc calculation context for ECC operations
+ * @param bin binary point representation
+ * @return computational representation
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_bin_to_point (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ const struct GNUNET_CRYPTO_EccPoint *bin);
+
+
+/**
+ * Add two points on the elliptic curve.
+ *
+ * @param edc calculation context for ECC operations
+ * @param a some value
+ * @param b some value
+ * @return @a a + @a b, must be freed using #GNUNET_CRYPTO_ecc_free()
+ */
+gcry_mpi_point_t
+GNUNET_CRYPTO_ecc_add (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t a,
+ gcry_mpi_point_t b);
+
+
+/**
+ * Obtain a random point on the curve and its
+ * additive inverse. Both returned values
+ * must be freed using #GNUNET_CRYPTO_ecc_free().
+ *
+ * @param edc calculation context for ECC operations
+ * @param[out] r set to a random point on the curve
+ * @param[out] r_inv set to the additive inverse of @a r
+ */
+void
+GNUNET_CRYPTO_ecc_rnd (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_point_t *r,
+ gcry_mpi_point_t *r_inv);
+
+
+/**
+ * Obtain a random scalar for point multiplication on the curve and
+ * its multiplicative inverse.
+ *
+ * @param edc calculation context for ECC operations
+ * @param[out] r set to a random scalar on the curve
+ * @param[out] r_inv set to the multiplicative inverse of @a r
+ */
+void
+GNUNET_CRYPTO_ecc_rnd_mpi (struct GNUNET_CRYPTO_EccDlogContext *edc,
+ gcry_mpi_t *r,
+ gcry_mpi_t *r_inv);
+
+
+/**
+ * Generate a random value mod n.
+ *
+ * @param edc ECC context
+ * @return random value mod n.
+ */
+gcry_mpi_t
+GNUNET_CRYPTO_ecc_random_mod_n (struct GNUNET_CRYPTO_EccDlogContext *edc);
+
+
+/**
+ * Free a point value returned by the API.
+ *
+ * @param p point to free
+ */
+void
+GNUNET_CRYPTO_ecc_free (gcry_mpi_point_t p);
+
+
+/**
+ * Release precalculated values.
+ *
+ * @param dlc dlog context
+ */
+void
+GNUNET_CRYPTO_ecc_dlog_release (struct GNUNET_CRYPTO_EccDlogContext *dlc);
+
+
/**
* @ingroup crypto
* Derive key material from a public and a private ECC key.
size_t len);
+/**
+ * Duplicate the given private key
+ *
+ * @param key the private key to duplicate
+ * @return the duplicate key; NULL upon error
+ */
+struct GNUNET_CRYPTO_rsa_PrivateKey *
+GNUNET_CRYPTO_rsa_private_key_dup (const struct GNUNET_CRYPTO_rsa_PrivateKey *key);
+
+
/**
* Extract the public key of the given private key.
*
struct GNUNET_HashCode *hc);
+/**
+ * Obtain the length of the RSA key in bits.
+ *
+ * @param key the public key to introspect
+ * @return length of the key in bits
+ */
+unsigned int
+GNUNET_CRYPTO_rsa_public_key_len (const struct GNUNET_CRYPTO_rsa_PublicKey *key);
+
+
/**
* Free memory occupied by the public key.
*
GNUNET_CRYPTO_rsa_signature_cmp (struct GNUNET_CRYPTO_rsa_Signature *s1,
struct GNUNET_CRYPTO_rsa_Signature *s2);
+/**
+ * Compare the values of two private keys.
+ *
+ * @param p1 one private key
+ * @param p2 the other private key
+ * @return 0 if the two are equal
+ */
+int
+GNUNET_CRYPTO_rsa_private_key_cmp (struct GNUNET_CRYPTO_rsa_PrivateKey *p1,
+ struct GNUNET_CRYPTO_rsa_PrivateKey *p2);
+
/**
* Compare the values of two public keys.
size_t len);
+/**
+ * Duplicate the given rsa signature
+ *
+ * @param sig the signature to duplicate
+ * @return the duplicate key; NULL upon error
+ */
+struct GNUNET_CRYPTO_rsa_Signature *
+GNUNET_CRYPTO_rsa_signature_dup (const struct GNUNET_CRYPTO_rsa_Signature *sig);
+
+
/**
* Unblind a blind-signed signature. The signature should have been generated
* with #GNUNET_CRYPTO_rsa_sign() using a hash that was blinded with
projects / oweals / gnunet.git / blobdiff