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// Copyright 2009 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// SHA256 block step.

// In its own file so that a faster assembly or C version

// can be substituted easily.

package sha256

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 _Block(dig *digest, p []byte) int {

        var w [64]uint32

        n := 0

        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++ {

                        t1 := (w[i-2]>>17 | w[i-2]<<(32-17)) ^ (w[i-2]>>19 | w[i-2]<<(32-19)) ^ (w[i-2] >> 10)

                        t2 := (w[i-15]>>7 | w[i-15]<<(32-7)) ^ (w[i-15]>>18 | w[i-15]<<(32-18)) ^ (w[i-15] >> 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 + ((e>>6 | e<<(32-6)) ^ (e>>11 | e<<(32-11)) ^ (e>>25 | e<<(32-25))) + ((e & f) ^ (^e & g)) + _K[i] + w[i]

                        t2 := ((a>>2 | a<<(32-2)) ^ (a>>13 | a<<(32-13)) ^ (a>>22 | a<<(32-22))) + ((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:]

                n += _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

        return n

}