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      1 // Copyright 2017 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 package sha1
      6 
      7 import "internal/cpu"
      8 
      9 var k = []uint32{
     10 	0x5A827999,
     11 	0x6ED9EBA1,
     12 	0x8F1BBCDC,
     13 	0xCA62C1D6,
     14 }
     15 
     16 var hasSHA1 = cpu.ARM64.HasSHA1
     17 
     18 //go:noescape
     19 func sha1block(h []uint32, p []byte, k []uint32)
     20 
     21 func block(dig *digest, p []byte) {
     22 	if !hasSHA1 {
     23 		blockGeneric(dig, p)
     24 	} else {
     25 		h := dig.h[:]
     26 		sha1block(h, p, k)
     27 	}
     28 }
     29