Go实现md2亿次加密
代码以下
package main import ( "bufio" "fmt" "hash" "io" "os" "time" ) func main() { for { fmt.Print("请输入须要md2亿次加密的字符：") input := bufio.NewScanner(os.Stdin) input.Scan() s := input.Text() start := time.Now().Unix() for i := 0; i < 100000000; i++ { s = md2(s) } end := time.Now().Unix() fmt.Printf("md2亿次加密结果为：%s\n", s) fmt.Printf("耗时：%d秒\n", end-start) } } func md2(str string) string { c := New() io.WriteString(c, str) has := c.Sum(nil) md5str1 := fmt.Sprintf("%x", has) return md5str1 } // The size of an MD2 checksum in bytes. const Size = 16 // The blocksize of MD2 in bytes. const BlockSize = 16 const _Chunk = 16 var PI_SUBST = []uint8{ 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131, 20, } // digest represents the partial evaluation of a checksum. type digest struct { digest [Size]byte // the digest, Size state [48]byte // state, 48 ints x [_Chunk]byte // temp storage buffer, 16 bytes, _Chunk nx uint8 // how many bytes are there in the buffer } func (d *digest) Reset() { for i := range d.digest { d.digest[i] = 0 } for i := range d.state { d.state[i] = 0 } for i := range d.x { d.x[i] = 0 } d.nx = 0 } // New returns a new hash.Hash computing the MD2 checksum. func New() hash.Hash { d := new(digest) d.Reset() return d } func (d *digest) Size() int { return Size } func (d *digest) BlockSize() int { return BlockSize } // Write is the interface for IO Writer func (d *digest) Write(p []byte) (nn int, err error) { //fmt.Printf("Getting %d bytes %x\n",len(p), p) nn = len(p) //d.len += uint64(nn) // If we have something left in the buffer if d.nx > 0 { n := uint8(len(p)) var i uint8 // try to copy the rest n bytes free of the buffer into the buffer // then hash the buffer if (n + d.nx) > _Chunk { n = _Chunk - d.nx } for i = 0; i < n; i++ { // copy n bytes to the buffer d.x[d.nx+i] = p[i] } d.nx += n // if we have exactly 1 block in the buffer then hash that block if d.nx == _Chunk { block(d, d.x[0:_Chunk]) d.nx = 0 } p = p[n:] } imax := len(p) / _Chunk // For the rest, try hashing by the blocksize for i := 0; i < imax; i++ { block(d, p[:_Chunk]) p = p[_Chunk:] } // Then stuff the rest that doesn't add up to a block to the buffer if len(p) > 0 { d.nx = uint8(copy(d.x[:], p)) //fmt.Printf("Length of p = %d, copied %d.\n", len(p), d.nx) } return } func (d0 *digest) Sum(in []byte) []byte { // fmt.Printf("=== Got sum request ===\n") // Make a copy of d0 so that caller can keep writing and summing. d := *d0 // Padding. var tmp [_Chunk]byte //tmp := make([]byte, _Chunk, _Chunk) len := uint8(d.nx) for i := range tmp { tmp[i] = _Chunk - len } //fmt.Printf("Calling block(%x) size %d for last block...\n", tmp, _Chunk-len) d.Write(tmp[0 : _Chunk-len]) // At this state we should have nothing left in buffer if d.nx != 0 { panic("d.nx != 0") } d.Write(d.digest[0:16]) // At this state we should have nothing left in buffer if d.nx != 0 { panic("d.nx != 0") } //fmt.Printf("=== Sum request done ===\n") //fmt.Printf("\n\n\n\n-------------------\n\n\n"); return append(in, d.state[0:16]...) } func block(dig *digest, p []byte) { //fmt.Printf("block() digest (%x) updating with p(%x) len=%d\n", dig.digest, p, len(p)) var t, i, j uint8 t = 0 for i = 0; i < 16; i++ { dig.state[i+16] = p[i] dig.state[i+32] = byte(p[i] ^ dig.state[i]) } for i = 0; i < 18; i++ { //fmt.Printf("t before: %d ", t) for j = 0; j < 48; j++ { dig.state[j] = byte(dig.state[j] ^ PI_SUBST[t]) t = dig.state[j] } //fmt.Printf("t before: %d ", t) t = byte(t + i) //fmt.Printf("t after: %d\n", t) } //fmt.Printf("---------------\n") t = dig.digest[15] for i = 0; i < 16; i++ { dig.digest[i] = byte(dig.digest[i] ^ PI_SUBST[p[i]^t]) t = dig.digest[i] //fmt.Printf("t after: %d\n", t) } //fmt.Printf(" --> Got digest = (%x)\n", dig.digest) }
打包程序
在项目下打开控制台，输入命令web
go build
双击exe文件便可直接运行程序
app