Method encipher

ext/jruby/bcrypt_jruby/BCrypt.java:487–508

Blowfish encipher a single 64-bit block encoded as two 32-bit halves @param lr an array containing the two 32-bit half blocks @param off the position in the array of the blocks

(int lr[], int off)

	 * @param off	the position in the array of the blocks
	 */
	private final void encipher(int lr[], int off) {
		int i, n, l = lr[off], r = lr[off + 1];

		l ^= P[0];
		for (i = 0; i <= BLOWFISH_NUM_ROUNDS - 2;) {
			// Feistel substitution on left word
			n = S[(l >> 24) & 0xff];
			n += S[0x100 | ((l >> 16) & 0xff)];
			n ^= S[0x200 | ((l >> 8) & 0xff)];
			n += S[0x300 | (l & 0xff)];
			r ^= n ^ P[++i];

			// Feistel substitution on right word
			n = S[(r >> 24) & 0xff];
			n += S[0x100 | ((r >> 16) & 0xff)];
			n ^= S[0x200 | ((r >> 8) & 0xff)];
			n += S[0x300 | (r & 0xff)];
			l ^= n ^ P[++i];
		}
		lr[off] = r ^ P[BLOWFISH_NUM_ROUNDS + 1];
		lr[off + 1] = l;
	}

	/**
	 * Cycically extract a word of key material