201 lines
6.4 KiB
Swift
Executable File
201 lines
6.4 KiB
Swift
Executable File
import Foundation
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/**
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Message Digest Algorithm 5
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- seealso:
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- https://ja.wikipedia.org/wiki/MD5
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- https://www.ietf.org/rfc/rfc1321.txt
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*/
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final class MD5 {
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static let a: UInt32 = 0x67452301
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static let b: UInt32 = 0xefcdab89
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static let c: UInt32 = 0x98badcfe
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static let d: UInt32 = 0x10325476
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static let S11: UInt32 = 7
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static let S12: UInt32 = 12
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static let S13: UInt32 = 17
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static let S14: UInt32 = 22
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static let S21: UInt32 = 5
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static let S22: UInt32 = 9
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static let S23: UInt32 = 14
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static let S24: UInt32 = 20
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static let S31: UInt32 = 4
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static let S32: UInt32 = 11
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static let S33: UInt32 = 16
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static let S34: UInt32 = 23
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static let S41: UInt32 = 6
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static let S42: UInt32 = 10
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static let S43: UInt32 = 15
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static let S44: UInt32 = 21
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struct Context {
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var a: UInt32 = MD5.a
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var b: UInt32 = MD5.b
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var c: UInt32 = MD5.c
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var d: UInt32 = MD5.d
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mutating func FF(_ x: UInt32, _ s: UInt32, _ k: UInt32) {
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let swap: UInt32 = d
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let F: UInt32 = (b & c) | ((~b) & d)
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d = c
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c = b
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b = b &+ rotateLeft(a &+ F &+ k &+ x, s)
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a = swap
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}
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mutating func GG(_ x: UInt32, _ s: UInt32, _ k: UInt32) {
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let swap: UInt32 = d
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let G: UInt32 = (d & b) | (c & (~d))
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d = c
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c = b
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b = b &+ rotateLeft(a &+ G &+ k &+ x, s)
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a = swap
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}
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mutating func HH(_ x: UInt32, _ s: UInt32, _ k: UInt32) {
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let swap: UInt32 = d
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let H: UInt32 = b ^ c ^ d
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d = c
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c = b
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b = b &+ rotateLeft(a &+ H &+ k &+ x, s)
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a = swap
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}
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mutating func II(_ x: UInt32, _ s: UInt32, _ k: UInt32) {
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let swap: UInt32 = d
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let I: UInt32 = c ^ (b | (~d))
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d = c
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c = b
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b = b &+ rotateLeft(a &+ I &+ k &+ x, s)
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a = swap
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}
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func rotateLeft(_ x: UInt32, _ n: UInt32) -> UInt32 {
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((x << n) & 0xFFFFFFFF) | (x >> (32 - n))
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}
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var data: Data {
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a.data + b.data + c.data + d.data
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}
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}
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static func base64(_ message: String) -> String {
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calculate(message).base64EncodedString(options: .lineLength64Characters)
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}
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static func calculate(_ message: String) -> Data {
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calculate(ByteArray().writeUTF8Bytes(message).data)
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}
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static func calculate(_ data: Data) -> Data {
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var context = Context()
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let count: Data = UInt64(data.count * 8).bigEndian.data
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let message = ByteArray(data: data + [0x80])
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message.length += 64 - (message.length % 64)
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message[message.length - 8] = count[7]
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message[message.length - 7] = count[6]
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message[message.length - 6] = count[5]
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message[message.length - 5] = count[4]
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message[message.length - 4] = count[3]
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message[message.length - 3] = count[2]
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message[message.length - 2] = count[1]
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message[message.length - 1] = count[0]
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message.sequence(64) {
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let x: [UInt32] = $0.toUInt32()
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guard x.count == 16 else {
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return
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}
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var ctx = Context()
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ctx.a = context.a
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ctx.b = context.b
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ctx.c = context.c
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ctx.d = context.d
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/* Round 1 */
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ctx.FF(x[ 0], S11, 0xd76aa478)
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ctx.FF(x[ 1], S12, 0xe8c7b756)
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ctx.FF(x[ 2], S13, 0x242070db)
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ctx.FF(x[ 3], S14, 0xc1bdceee)
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ctx.FF(x[ 4], S11, 0xf57c0faf)
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ctx.FF(x[ 5], S12, 0x4787c62a)
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ctx.FF(x[ 6], S13, 0xa8304613)
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ctx.FF(x[ 7], S14, 0xfd469501)
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ctx.FF(x[ 8], S11, 0x698098d8)
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ctx.FF(x[ 9], S12, 0x8b44f7af)
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ctx.FF(x[10], S13, 0xffff5bb1)
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ctx.FF(x[11], S14, 0x895cd7be)
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ctx.FF(x[12], S11, 0x6b901122)
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ctx.FF(x[13], S12, 0xfd987193)
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ctx.FF(x[14], S13, 0xa679438e)
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ctx.FF(x[15], S14, 0x49b40821)
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/* Round 2 */
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ctx.GG(x[ 1], S21, 0xf61e2562)
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ctx.GG(x[ 6], S22, 0xc040b340)
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ctx.GG(x[11], S23, 0x265e5a51)
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ctx.GG(x[ 0], S24, 0xe9b6c7aa)
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ctx.GG(x[ 5], S21, 0xd62f105d)
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ctx.GG(x[10], S22, 0x2441453)
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ctx.GG(x[15], S23, 0xd8a1e681)
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ctx.GG(x[ 4], S24, 0xe7d3fbc8)
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ctx.GG(x[ 9], S21, 0x21e1cde6)
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ctx.GG(x[14], S22, 0xc33707d6)
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ctx.GG(x[ 3], S23, 0xf4d50d87)
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ctx.GG(x[ 8], S24, 0x455a14ed)
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ctx.GG(x[13], S21, 0xa9e3e905)
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ctx.GG(x[ 2], S22, 0xfcefa3f8)
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ctx.GG(x[ 7], S23, 0x676f02d9)
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ctx.GG(x[12], S24, 0x8d2a4c8a)
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/* Round 3 */
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ctx.HH(x[ 5], S31, 0xfffa3942)
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ctx.HH(x[ 8], S32, 0x8771f681)
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ctx.HH(x[11], S33, 0x6d9d6122)
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ctx.HH(x[14], S34, 0xfde5380c)
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ctx.HH(x[ 1], S31, 0xa4beea44)
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ctx.HH(x[ 4], S32, 0x4bdecfa9)
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ctx.HH(x[ 7], S33, 0xf6bb4b60)
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ctx.HH(x[10], S34, 0xbebfbc70)
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ctx.HH(x[13], S31, 0x289b7ec6)
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ctx.HH(x[ 0], S32, 0xeaa127fa)
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ctx.HH(x[ 3], S33, 0xd4ef3085)
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ctx.HH(x[ 6], S34, 0x4881d05)
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ctx.HH(x[ 9], S31, 0xd9d4d039)
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ctx.HH(x[12], S32, 0xe6db99e5)
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ctx.HH(x[15], S33, 0x1fa27cf8)
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ctx.HH(x[ 2], S34, 0xc4ac5665)
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/* Round 4 */
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ctx.II(x[ 0], S41, 0xf4292244)
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ctx.II(x[ 7], S42, 0x432aff97)
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ctx.II(x[14], S43, 0xab9423a7)
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ctx.II(x[ 5], S44, 0xfc93a039)
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ctx.II(x[12], S41, 0x655b59c3)
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ctx.II(x[ 3], S42, 0x8f0ccc92)
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ctx.II(x[10], S43, 0xffeff47d)
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ctx.II(x[ 1], S44, 0x85845dd1)
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ctx.II(x[ 8], S41, 0x6fa87e4f)
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ctx.II(x[15], S42, 0xfe2ce6e0)
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ctx.II(x[ 6], S43, 0xa3014314)
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ctx.II(x[13], S44, 0x4e0811a1)
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ctx.II(x[ 4], S41, 0xf7537e82)
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ctx.II(x[11], S42, 0xbd3af235)
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ctx.II(x[ 2], S43, 0x2ad7d2bb)
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ctx.II(x[ 9], S44, 0xeb86d391)
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context.a = context.a &+ ctx.a
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context.b = context.b &+ ctx.b
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context.c = context.c &+ ctx.c
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context.d = context.d &+ ctx.d
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}
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return context.data
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}
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}
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