includes/clientside/static/diffiehellman.js
author Dan
Sat, 12 Apr 2008 09:50:49 -0400
changeset 530 8d3c49b8dc79
parent 436 242353360e37
permissions -rw-r--r--
Fixed Javascript error in admin-menu with quotes in list items
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
436
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
     1
/*
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
     2
 * The Diffie-Hellman key exchange protocol.
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
     3
 */
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
     4
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
     5
// Our prime number as a base for operations.
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
     6
var dh_prime = '82818079787776757473727170696867666564636261605958575655545352515049484746454443424140393837363534333231302928272625242322212019181716151413121110987654321';
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
     7
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
     8
// g, a primitive root used as an exponent
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
     9
// (2 and 5 are acceptable, but BigInt is faster with odd numbers)
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    10
var dh_g = '5';
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    11
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    12
/**
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    13
 * Generates a Diffie-Hellman private key
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    14
 * @return string(BigInt)
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    15
 */
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    16
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    17
function dh_gen_private()
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    18
{
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    19
  return EnanoMath.RandomInt(256);
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    20
}
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    21
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    22
/**
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    23
 * Calculates the public key from the private key
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    24
 * @param string(BigInt)
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    25
 * @return string(BigInt)
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    26
 */
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    27
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    28
function dh_gen_public(b)
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    29
{
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    30
  return EnanoMath.PowMod(dh_g, b, dh_prime);
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    31
}
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    32
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    33
/**
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    34
 * Calculates the shared secret.
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    35
 * @param string(BigInt) Our private key
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    36
 * @param string(BigInt) Remote party's public key
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    37
 * @return string(BigInt)
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    38
 */
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    39
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    40
function dh_gen_shared_secret(b, A)
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    41
{
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    42
  return EnanoMath.PowMod(A, b, dh_prime);
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    43
}
242353360e37 Added support for Diffie-Hellman key exchange during login. w00t!
Dan
parents:
diff changeset
    44