| /* |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. |
| */ |
| |
| // |
| // hash256.swift - Implementation of SHA-256 |
| // |
| // Created by Michael Scott on 17/06/2015. |
| // Copyright (c) 2015 Michael Scott. All rights reserved. |
| // SHA256 Implementation |
| // |
| |
| final class HASH256{ |
| |
| private var length=[UInt32](repeating: 0,count: 2) |
| private var h=[UInt32](repeating: 0,count: 8) |
| private var w=[UInt32](repeating: 0,count: 64) |
| static let H0:UInt32=0x6A09E667 |
| static let H1:UInt32=0xBB67AE85 |
| static let H2:UInt32=0x3C6EF372 |
| static let H3:UInt32=0xA54FF53A |
| static let H4:UInt32=0x510E527F |
| static let H5:UInt32=0x9B05688C |
| static let H6:UInt32=0x1F83D9AB |
| static let H7:UInt32=0x5BE0CD19 |
| |
| static let len:Int=32 |
| |
| static let K:[UInt32]=[ |
| 0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5, |
| 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174, |
| 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da, |
| 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967, |
| 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85, |
| 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070, |
| 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3, |
| 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2] |
| |
| |
| private static func S(_ n: UInt32,_ x: UInt32) -> UInt32 |
| { |
| return ((x>>n)|(x<<(32-n))) |
| } |
| |
| private static func R(_ n: UInt32,_ x: UInt32) -> UInt32 |
| { |
| return (x>>n) |
| } |
| |
| private static func Ch(_ x: UInt32,_ y: UInt32,_ z:UInt32) -> UInt32 |
| { |
| return ((x&y)^(~(x)&z)) |
| } |
| |
| private static func Maj(_ x: UInt32,_ y: UInt32,_ z:UInt32) -> UInt32 |
| { |
| return ((x&y)^(x&z)^(y&z)) |
| } |
| |
| private static func Sig0(_ x: UInt32) -> UInt32 |
| { |
| return (S(2,x)^S(13,x)^S(22,x)) |
| } |
| |
| private static func Sig1(_ x: UInt32) -> UInt32 |
| { |
| return (S(6,x)^S(11,x)^S(25,x)) |
| } |
| |
| private static func theta0(_ x: UInt32) -> UInt32 |
| { |
| return (S(7,x)^S(18,x)^R(3,x)) |
| } |
| |
| private static func theta1(_ x: UInt32) -> UInt32 |
| { |
| return (S(17,x)^S(19,x)^R(10,x)) |
| } |
| |
| private func transform() |
| { /* basic transformation step */ |
| var a,b,c,d,e,f,g,hh,t1,t2 :UInt32 |
| for j in 16 ..< 64 |
| { |
| w[j]=HASH256.theta1(w[j-2])&+w[j-7]&+HASH256.theta0(w[j-15])&+w[j-16] |
| } |
| a=h[0]; b=h[1]; c=h[2]; d=h[3] |
| e=h[4]; f=h[5]; g=h[6]; hh=h[7] |
| |
| for j in 0 ..< 64 |
| { /* 64 times - mush it up */ |
| t1=hh&+HASH256.Sig1(e)&+HASH256.Ch(e,f,g)&+HASH256.K[j]&+w[j] |
| t2=HASH256.Sig0(a)&+HASH256.Maj(a,b,c) |
| hh=g; g=f; f=e; |
| e=d&+t1; |
| d=c; |
| c=b; |
| b=a; |
| a=t1&+t2; |
| } |
| h[0]=h[0]&+a; h[1]=h[1]&+b; h[2]=h[2]&+c; h[3]=h[3]&+d |
| h[4]=h[4]&+e; h[5]=h[5]&+f; h[6]=h[6]&+g; h[7]=h[7]&+hh; |
| } |
| |
| /* Re-Initialise Hash function */ |
| func init_it() |
| { /* initialise */ |
| for i in 0 ..< 64 {w[i]=0} |
| length[0]=0; length[1]=0 |
| h[0]=HASH256.H0; |
| h[1]=HASH256.H1; |
| h[2]=HASH256.H2; |
| h[3]=HASH256.H3; |
| h[4]=HASH256.H4; |
| h[5]=HASH256.H5; |
| h[6]=HASH256.H6; |
| h[7]=HASH256.H7; |
| } |
| |
| init() |
| { |
| init_it() |
| } |
| |
| /* process a single byte */ |
| func process(_ byt: UInt8) |
| { /* process the next message byte */ |
| let cnt=Int((length[0]/32)%16) |
| w[cnt]<<=8; |
| w[cnt]|=(UInt32(byt)&0xFF); |
| length[0]+=8; |
| if (length[0]==0) { length[1] += 1; length[0]=0 } |
| if ((length[0]%512)==0) {transform()} |
| } |
| |
| /* process an array of bytes */ |
| func process_array(_ b: [UInt8]) |
| { |
| for i in 0 ..< b.count {process((b[i]))} |
| } |
| |
| /* process a 32-bit integer */ |
| func process_num(_ n:Int32) |
| { |
| process(UInt8((n>>24)&0xff)) |
| process(UInt8((n>>16)&0xff)) |
| process(UInt8((n>>8)&0xff)) |
| process(UInt8(n&0xff)) |
| } |
| |
| /* Generate 32-byte Hash */ |
| func hash() -> [UInt8] |
| { /* pad message and finish - supply digest */ |
| var digest=[UInt8](repeating: 0,count: 32) |
| |
| let len0=length[0] |
| let len1=length[1] |
| process(0x80); |
| while ((length[0]%512) != 448) {process(0)} |
| w[14]=len1 |
| w[15]=len0; |
| transform() |
| for i in 0 ..< HASH256.len |
| { /* convert to bytes */ |
| let r=(8*(3-UInt32(i)%4)); |
| digest[i]=UInt8((h[i/4]>>r) & 0xff); |
| } |
| init_it(); |
| return digest; |
| } |
| |
| |
| } |