123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154 |
- /*
- Copyright (c) 2009 The Go Authors. All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions are
- met:
-
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above
- copyright notice, this list of conditions and the following disclaimer
- in the documentation and/or other materials provided with the
- distribution.
- * Neither the name of Google Inc. nor the names of its
- contributors may be used to endorse or promote products derived from
- this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- // SHA256 block step.
- // In its own file so that a faster assembly or C version
- // can be substituted easily.
-
- package migrations
-
- import "math/bits"
-
- var _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,
- }
-
- func sha256BlockGeneric(dig *digest, p []byte) {
- var w [64]uint32
- h0, h1, h2, h3, h4, h5, h6, h7 := dig.h[0], dig.h[1], dig.h[2], dig.h[3], dig.h[4], dig.h[5], dig.h[6], dig.h[7]
- for len(p) >= chunk {
- // Can interlace the computation of w with the
- // rounds below if needed for speed.
- for i := 0; i < 16; i++ {
- j := i * 4
- w[i] = uint32(p[j])<<24 | uint32(p[j+1])<<16 | uint32(p[j+2])<<8 | uint32(p[j+3])
- }
- for i := 16; i < 64; i++ {
- v1 := w[i-2]
- t1 := (bits.RotateLeft32(v1, -17)) ^ (bits.RotateLeft32(v1, -19)) ^ (v1 >> 10)
- v2 := w[i-15]
- t2 := (bits.RotateLeft32(v2, -7)) ^ (bits.RotateLeft32(v2, -18)) ^ (v2 >> 3)
- w[i] = t1 + w[i-7] + t2 + w[i-16]
- }
-
- a, b, c, d, e, f, g, h := h0, h1, h2, h3, h4, h5, h6, h7
-
- for i := 0; i < 64; i++ {
- t1 := h + ((bits.RotateLeft32(e, -6)) ^ (bits.RotateLeft32(e, -11)) ^ (bits.RotateLeft32(e, -25))) + ((e & f) ^ (^e & g)) + _K[i] + w[i]
-
- t2 := ((bits.RotateLeft32(a, -2)) ^ (bits.RotateLeft32(a, -13)) ^ (bits.RotateLeft32(a, -22))) + ((a & b) ^ (a & c) ^ (b & c))
-
- h = g
- g = f
- f = e
- e = d + t1
- d = c
- c = b
- b = a
- a = t1 + t2
- }
-
- h0 += a
- h1 += b
- h2 += c
- h3 += d
- h4 += e
- h5 += f
- h6 += g
- h7 += h
-
- p = p[chunk:]
- }
-
- dig.h[0], dig.h[1], dig.h[2], dig.h[3], dig.h[4], dig.h[5], dig.h[6], dig.h[7] = h0, h1, h2, h3, h4, h5, h6, h7
- }
|