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+//
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+// SHA256.swift
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+// CryptoSwift
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+//
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+// Created by Marcin Krzyzanowski on 20/08/14.
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+// Copyright (c) 2014 Marcin Krzyzanowski. All rights reserved.
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+//
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+
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+import Foundation
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+
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+public class SHA256 : CryptoHashBase {
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+ private let h:[UInt32] = [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]
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+ private let k:[UInt32] = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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+ 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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+ 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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+ 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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+ 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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+ 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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+ 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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+ 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2]
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+
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+ public func calculate() -> NSData {
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+ var tmpMessage = self.prepare()
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+ let wordSize = sizeof(UInt32)
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+
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+ // hash values
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+ var hh = h
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+
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+ // append message length, in a 64-bit big-endian integer. So now the message length is a multiple of 512 bits.
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+ tmpMessage.appendBytes((message.length * 8).bytes(64 / 8));
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+
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+ // Process the message in successive 512-bit chunks:
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+ let chunkSizeBytes = 512 / 8 // 64
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+ var leftMessageBytes = tmpMessage.length
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+ for var i = 0; i < tmpMessage.length; i = i + chunkSizeBytes, leftMessageBytes -= chunkSizeBytes {
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+ let chunk = tmpMessage.subdataWithRange(NSRange(location: i, length: min(chunkSizeBytes,leftMessageBytes)))
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+ // break chunk into sixteen 32-bit words M[j], 0 ≤ j ≤ 15, big-endian
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+ // Extend the sixteen 32-bit words into sixty-four 32-bit words:
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+ var M:[UInt32] = [UInt32](count: 64, repeatedValue: 0)
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+ for x in 0..<M.count {
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+ switch (x) {
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+ case 0...15:
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+ var le:UInt32 = 0
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+ chunk.getBytes(&le, range:NSRange(location:x * wordSize, length: wordSize));
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+ M[x] = le.bigEndian
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+ break
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+ default:
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+ let s0 = rotateRight(M[x-15], 7) ^ rotateRight(M[x-15], 18) ^ (M[x-15] >> 3)
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+ let s1 = rotateRight(M[x-2], 17) ^ rotateRight(M[x-2], 19) ^ (M[x-2] >> 10)
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+ M[x] = M[x-16] &+ s0 &+ M[x-7] &+ s1
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+ break
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+ }
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+ }
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+
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+ var A = hh[0]
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+ var B = hh[1]
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+ var C = hh[2]
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+ var D = hh[3]
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+ var E = hh[4]
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+ var F = hh[5]
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+ var G = hh[6]
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+ var H = hh[7]
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+
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+ // Main loop
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+ for j in 0...63 {
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+ let s0 = rotateRight(A,2) ^ rotateRight(A,13) ^ rotateRight(A,22)
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+ let maj = (A & B) ^ (A & C) ^ (B & C)
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+ let t2 = s0 &+ maj
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+ let s1 = rotateRight(E,6) ^ rotateRight(E,11) ^ rotateRight(E,25)
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+ let ch = (E & F) ^ ((~E) & G)
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+ let t1 = H &+ s1 &+ ch &+ k[j] &+ M[j]
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+
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+ H = G
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+ G = F
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+ F = E
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+ E = D &+ t1
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+ D = C
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+ C = B
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+ B = A
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+ A = t1 &+ t2
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+ }
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+
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+ hh[0] = (hh[0] &+ A) & 0xffffffff
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+ hh[1] = (hh[1] &+ B) & 0xffffffff
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+ hh[2] = (hh[2] &+ C) & 0xffffffff
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+ hh[3] = (hh[3] &+ D) & 0xffffffff
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+ hh[4] = (hh[4] &+ E) & 0xffffffff
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+ hh[5] = (hh[5] &+ F) & 0xffffffff
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+ hh[6] = (hh[6] &+ G) & 0xffffffff
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+ hh[7] = (hh[7] &+ H) & 0xffffffff
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+ }
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+
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+ // Produce the final hash value (big-endian) as a 160 bit number:
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+ var buf: NSMutableData = NSMutableData();
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+ hh.map({ (item) -> () in
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+ var i:UInt32 = item.bigEndian
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+ buf.appendBytes(&i, length: sizeof(UInt32))
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+ })
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+
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+ return buf.copy() as NSData;
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+ }
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+}
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Marcin Krzyżanowski