Examples of makwa.MakwaPrivateKey

A {@code MakwaPrivateKey} instance encapsulates a Makwa privatekey, i.e. the two prime factors whose product is the Makwa modulus.

A new private key can be generated with {@link #generate}. The target modulus size (in bits) is provided; it must be at least 1273 bits (the normal modulus size is 2048 bits).

Private and public keys can be encoded into array of bytes; the {@link #exportPrivate} and {@link #exportPublic} methods implementthis serialization. Decoding can be done in several ways:

A new {@code MakwaPrivateKey} instance can be created over anencoded private key used as parameter for the constructor.
A public key is actually the modulus; encoding and decoding can be performed with the static {@link #encodePublic} and{@link #decodePublic} methods.
The {@link Makwa} class can be instantiated with an encodedpublic or private key as first parameter.

The encoded format for a modulus consists in the concatenation, in that order, of the following:

a four-byte header: 55 41 4D 30
the modulus as a multi-precision integer (MPI):
- an integer value " {@code len}" encoded in unsigned big-endian convention over exactly two bytes;
- exactly {@code len} bytes which encode the modulus in unsignedbig-endian convention.
When a MPI is encoded, the minimal length encoding should be used (no leading byte of value 0x00).

The encoded format for a private consists in the concatenation, in that order, of the following:

a four-byte header: 55 41 4D 31
the first prime factor, as a MPI;
the second prime factor, as a MPI.

When encoding a private key, the greatest of the two prime factors is supposed to come first.

Instances of {@code MakwaPrivateKey} are immutable andthread-safe.

@version $Revision$ @author Thomas Pornin

  {
    /*
     * Check encoding and decoding of public and private keys.
     */
    modulus = MakwaPrivateKey.decodePublic(PUB2048);
    privKey = new MakwaPrivateKey(PRIV2048);
    check(modulus.equals(privKey.getModulus()));
    check(equals(privKey.exportPrivate(), PRIV2048));
    check(equals(privKey.exportPublic(), PUB2048));
    check(modulus.equals(MakwaPrivateKey.decodePublic(PUB2048)));

      }
    }
    if (size == 0) {
      usage();
    }
    MakwaPrivateKey pkey = MakwaPrivateKey.generate(size);
    if (textOut) {
      System.out.println("modulus = 0x"
        + pkey.getModulus().toString(16).toUpperCase());
    }
    if (outPub != null) {
      FileOutputStream out = new FileOutputStream(outPub);
      try {
        out.write(pkey.exportPublic());
      } finally {
        out.close();
      }
    }
    if (outPriv != null) {
      FileOutputStream out = new FileOutputStream(outPriv);
      try {
        out.write(pkey.exportPrivate());
      } finally {
        out.close();
      }
    }
  }

    } catch (NoSuchAlgorithmException nsae) {
      throw new MakwaException("no native SHA-256");
    }


    BigInteger mod = MakwaPrivateKey.decodePublic(PUB2048);
    MakwaPrivateKey pkey = new MakwaPrivateKey(PRIV2048);
    check(mod.equals(pkey.getModulus()));
    Makwa mpub = new Makwa(mod, Makwa.SHA256, false, 0, 1024);
    Makwa mpriv = new Makwa(pkey, Makwa.SHA256, false, 0, 1024);


    /*
     * Some KDF test vectors.

Examples of makwa.MakwaPrivateKey

Related Classes of makwa.MakwaPrivateKey