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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.

// SHA512 block step.

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

// can be substituted easily.

package sha512

var _K = []uint64{

        0x428a2f98d728ae22,

        0x7137449123ef65cd,

        0xb5c0fbcfec4d3b2f,

        0xe9b5dba58189dbbc,

        0x3956c25bf348b538,

        0x59f111f1b605d019,

        0x923f82a4af194f9b,

        0xab1c5ed5da6d8118,

        0xd807aa98a3030242,

        0x12835b0145706fbe,

        0x243185be4ee4b28c,

        0x550c7dc3d5ffb4e2,

        0x72be5d74f27b896f,

        0x80deb1fe3b1696b1,

        0x9bdc06a725c71235,

        0xc19bf174cf692694,

        0xe49b69c19ef14ad2,

        0xefbe4786384f25e3,

        0x0fc19dc68b8cd5b5,

        0x240ca1cc77ac9c65,

        0x2de92c6f592b0275,

        0x4a7484aa6ea6e483,

        0x5cb0a9dcbd41fbd4,

        0x76f988da831153b5,

        0x983e5152ee66dfab,

        0xa831c66d2db43210,

        0xb00327c898fb213f,

        0xbf597fc7beef0ee4,

        0xc6e00bf33da88fc2,

        0xd5a79147930aa725,

        0x06ca6351e003826f,

        0x142929670a0e6e70,

        0x27b70a8546d22ffc,

        0x2e1b21385c26c926,

        0x4d2c6dfc5ac42aed,

        0x53380d139d95b3df,

        0x650a73548baf63de,

        0x766a0abb3c77b2a8,

        0x81c2c92e47edaee6,

        0x92722c851482353b,

        0xa2bfe8a14cf10364,

        0xa81a664bbc423001,

        0xc24b8b70d0f89791,

        0xc76c51a30654be30,

        0xd192e819d6ef5218,

        0xd69906245565a910,

        0xf40e35855771202a,

        0x106aa07032bbd1b8,

        0x19a4c116b8d2d0c8,

        0x1e376c085141ab53,

        0x2748774cdf8eeb99,

        0x34b0bcb5e19b48a8,

        0x391c0cb3c5c95a63,

        0x4ed8aa4ae3418acb,

        0x5b9cca4f7763e373,

        0x682e6ff3d6b2b8a3,

        0x748f82ee5defb2fc,

        0x78a5636f43172f60,

        0x84c87814a1f0ab72,

        0x8cc702081a6439ec,

        0x90befffa23631e28,

        0xa4506cebde82bde9,

        0xbef9a3f7b2c67915,

        0xc67178f2e372532b,

        0xca273eceea26619c,

        0xd186b8c721c0c207,

        0xeada7dd6cde0eb1e,

        0xf57d4f7fee6ed178,

        0x06f067aa72176fba,

        0x0a637dc5a2c898a6,

        0x113f9804bef90dae,

        0x1b710b35131c471b,

        0x28db77f523047d84,

        0x32caab7b40c72493,

        0x3c9ebe0a15c9bebc,

        0x431d67c49c100d4c,

        0x4cc5d4becb3e42b6,

        0x597f299cfc657e2a,

        0x5fcb6fab3ad6faec,

        0x6c44198c4a475817,

}

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

        var w [80]uint64

        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 {

                for i := 0; i < 16; i++ {

                        j := i * 8

                        w[i] = uint64(p[j])<<56 | uint64(p[j+1])<<48 | uint64(p[j+2])<<40 | uint64(p[j+3])<<32 |

                                uint64(p[j+4])<<24 | uint64(p[j+5])<<16 | uint64(p[j+6])<<8 | uint64(p[j+7])

                }

                for i := 16; i < 80; i++ {

                        t1 := (w[i-2]>>19 | w[i-2]<<(64-19)) ^ (w[i-2]>>61 | w[i-2]<<(64-61)) ^ (w[i-2] >> 6)

                        t2 := (w[i-15]>>1 | w[i-15]<<(64-1)) ^ (w[i-15]>>8 | w[i-15]<<(64-8)) ^ (w[i-15] >> 7)

                        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 < 80; i++ {

                        t1 := h + ((e>>14 | e<<(64-14)) ^ (e>>18 | e<<(64-18)) ^ (e>>41 | e<<(64-41))) + ((e & f) ^ (^e & g)) + _K[i] + w[i]

                        t2 := ((a>>28 | a<<(64-28)) ^ (a>>34 | a<<(64-34)) ^ (a>>39 | a<<(64-39))) + ((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

}