github.com/graybobo/golang.org-package-offline-cache@v0.0.0-20200626051047-6608995c132f/x/crypto/ripemd160/ripemd160block.go (about)

     1  // Copyright 2010 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // RIPEMD-160 block step.
     6  // In its own file so that a faster assembly or C version
     7  // can be substituted easily.
     8  
     9  package ripemd160
    10  
    11  // work buffer indices and roll amounts for one line
    12  var _n = [80]uint{
    13  	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
    14  	7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
    15  	3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
    16  	1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
    17  	4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13,
    18  }
    19  
    20  var _r = [80]uint{
    21  	11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
    22  	7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
    23  	11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
    24  	11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
    25  	9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6,
    26  }
    27  
    28  // same for the other parallel one
    29  var n_ = [80]uint{
    30  	5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
    31  	6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
    32  	15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
    33  	8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
    34  	12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11,
    35  }
    36  
    37  var r_ = [80]uint{
    38  	8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
    39  	9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
    40  	9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
    41  	15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
    42  	8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11,
    43  }
    44  
    45  func _Block(md *digest, p []byte) int {
    46  	n := 0
    47  	var x [16]uint32
    48  	var alpha, beta uint32
    49  	for len(p) >= BlockSize {
    50  		a, b, c, d, e := md.s[0], md.s[1], md.s[2], md.s[3], md.s[4]
    51  		aa, bb, cc, dd, ee := a, b, c, d, e
    52  		j := 0
    53  		for i := 0; i < 16; i++ {
    54  			x[i] = uint32(p[j]) | uint32(p[j+1])<<8 | uint32(p[j+2])<<16 | uint32(p[j+3])<<24
    55  			j += 4
    56  		}
    57  
    58  		// round 1
    59  		i := 0
    60  		for i < 16 {
    61  			alpha = a + (b ^ c ^ d) + x[_n[i]]
    62  			s := _r[i]
    63  			alpha = (alpha<<s | alpha>>(32-s)) + e
    64  			beta = c<<10 | c>>22
    65  			a, b, c, d, e = e, alpha, b, beta, d
    66  
    67  			// parallel line
    68  			alpha = aa + (bb ^ (cc | ^dd)) + x[n_[i]] + 0x50a28be6
    69  			s = r_[i]
    70  			alpha = (alpha<<s | alpha>>(32-s)) + ee
    71  			beta = cc<<10 | cc>>22
    72  			aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
    73  
    74  			i++
    75  		}
    76  
    77  		// round 2
    78  		for i < 32 {
    79  			alpha = a + (b&c | ^b&d) + x[_n[i]] + 0x5a827999
    80  			s := _r[i]
    81  			alpha = (alpha<<s | alpha>>(32-s)) + e
    82  			beta = c<<10 | c>>22
    83  			a, b, c, d, e = e, alpha, b, beta, d
    84  
    85  			// parallel line
    86  			alpha = aa + (bb&dd | cc&^dd) + x[n_[i]] + 0x5c4dd124
    87  			s = r_[i]
    88  			alpha = (alpha<<s | alpha>>(32-s)) + ee
    89  			beta = cc<<10 | cc>>22
    90  			aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
    91  
    92  			i++
    93  		}
    94  
    95  		// round 3
    96  		for i < 48 {
    97  			alpha = a + (b | ^c ^ d) + x[_n[i]] + 0x6ed9eba1
    98  			s := _r[i]
    99  			alpha = (alpha<<s | alpha>>(32-s)) + e
   100  			beta = c<<10 | c>>22
   101  			a, b, c, d, e = e, alpha, b, beta, d
   102  
   103  			// parallel line
   104  			alpha = aa + (bb | ^cc ^ dd) + x[n_[i]] + 0x6d703ef3
   105  			s = r_[i]
   106  			alpha = (alpha<<s | alpha>>(32-s)) + ee
   107  			beta = cc<<10 | cc>>22
   108  			aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
   109  
   110  			i++
   111  		}
   112  
   113  		// round 4
   114  		for i < 64 {
   115  			alpha = a + (b&d | c&^d) + x[_n[i]] + 0x8f1bbcdc
   116  			s := _r[i]
   117  			alpha = (alpha<<s | alpha>>(32-s)) + e
   118  			beta = c<<10 | c>>22
   119  			a, b, c, d, e = e, alpha, b, beta, d
   120  
   121  			// parallel line
   122  			alpha = aa + (bb&cc | ^bb&dd) + x[n_[i]] + 0x7a6d76e9
   123  			s = r_[i]
   124  			alpha = (alpha<<s | alpha>>(32-s)) + ee
   125  			beta = cc<<10 | cc>>22
   126  			aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
   127  
   128  			i++
   129  		}
   130  
   131  		// round 5
   132  		for i < 80 {
   133  			alpha = a + (b ^ (c | ^d)) + x[_n[i]] + 0xa953fd4e
   134  			s := _r[i]
   135  			alpha = (alpha<<s | alpha>>(32-s)) + e
   136  			beta = c<<10 | c>>22
   137  			a, b, c, d, e = e, alpha, b, beta, d
   138  
   139  			// parallel line
   140  			alpha = aa + (bb ^ cc ^ dd) + x[n_[i]]
   141  			s = r_[i]
   142  			alpha = (alpha<<s | alpha>>(32-s)) + ee
   143  			beta = cc<<10 | cc>>22
   144  			aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
   145  
   146  			i++
   147  		}
   148  
   149  		// combine results
   150  		dd += c + md.s[1]
   151  		md.s[1] = md.s[2] + d + ee
   152  		md.s[2] = md.s[3] + e + aa
   153  		md.s[3] = md.s[4] + a + bb
   154  		md.s[4] = md.s[0] + b + cc
   155  		md.s[0] = dd
   156  
   157  		p = p[BlockSize:]
   158  		n += BlockSize
   159  	}
   160  	return n
   161  }