Imported Upstream version 1.4upstream/1.4

5 files changed, 802 insertions, 0 deletions

diff --git a/src/crypto/sha512/sha512.go b/src/crypto/sha512/sha512.go
new file mode 100644
index 000000000..bca7a91e2
--- /dev/null
+++ b/src/crypto/sha512/sha512.go
@@ -0,0 +1,198 @@
+// 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.
+
+// Package sha512 implements the SHA384 and SHA512 hash algorithms as defined
+// in FIPS 180-2.
+package sha512
+
+import (
+	"crypto"
+	"hash"
+)
+
+func init() {
+	crypto.RegisterHash(crypto.SHA384, New384)
+	crypto.RegisterHash(crypto.SHA512, New)
+}
+
+// The size of a SHA512 checksum in bytes.
+const Size = 64
+
+// The size of a SHA384 checksum in bytes.
+const Size384 = 48
+
+// The blocksize of SHA512 and SHA384 in bytes.
+const BlockSize = 128
+
+const (
+	chunk     = 128
+	init0     = 0x6a09e667f3bcc908
+	init1     = 0xbb67ae8584caa73b
+	init2     = 0x3c6ef372fe94f82b
+	init3     = 0xa54ff53a5f1d36f1
+	init4     = 0x510e527fade682d1
+	init5     = 0x9b05688c2b3e6c1f
+	init6     = 0x1f83d9abfb41bd6b
+	init7     = 0x5be0cd19137e2179
+	init0_384 = 0xcbbb9d5dc1059ed8
+	init1_384 = 0x629a292a367cd507
+	init2_384 = 0x9159015a3070dd17
+	init3_384 = 0x152fecd8f70e5939
+	init4_384 = 0x67332667ffc00b31
+	init5_384 = 0x8eb44a8768581511
+	init6_384 = 0xdb0c2e0d64f98fa7
+	init7_384 = 0x47b5481dbefa4fa4
+)
+
+// digest represents the partial evaluation of a checksum.
+type digest struct {
+	h     [8]uint64
+	x     [chunk]byte
+	nx    int
+	len   uint64
+	is384 bool // mark if this digest is SHA-384
+}
+
+func (d *digest) Reset() {
+	if !d.is384 {
+		d.h[0] = init0
+		d.h[1] = init1
+		d.h[2] = init2
+		d.h[3] = init3
+		d.h[4] = init4
+		d.h[5] = init5
+		d.h[6] = init6
+		d.h[7] = init7
+	} else {
+		d.h[0] = init0_384
+		d.h[1] = init1_384
+		d.h[2] = init2_384
+		d.h[3] = init3_384
+		d.h[4] = init4_384
+		d.h[5] = init5_384
+		d.h[6] = init6_384
+		d.h[7] = init7_384
+	}
+	d.nx = 0
+	d.len = 0
+}
+
+// New returns a new hash.Hash computing the SHA512 checksum.
+func New() hash.Hash {
+	d := new(digest)
+	d.Reset()
+	return d
+}
+
+// New384 returns a new hash.Hash computing the SHA384 checksum.
+func New384() hash.Hash {
+	d := new(digest)
+	d.is384 = true
+	d.Reset()
+	return d
+}
+
+func (d *digest) Size() int {
+	if !d.is384 {
+		return Size
+	}
+	return Size384
+}
+
+func (d *digest) BlockSize() int { return BlockSize }
+
+func (d *digest) Write(p []byte) (nn int, err error) {
+	nn = len(p)
+	d.len += uint64(nn)
+	if d.nx > 0 {
+		n := copy(d.x[d.nx:], p)
+		d.nx += n
+		if d.nx == chunk {
+			block(d, d.x[:])
+			d.nx = 0
+		}
+		p = p[n:]
+	}
+	if len(p) >= chunk {
+		n := len(p) &^ (chunk - 1)
+		block(d, p[:n])
+		p = p[n:]
+	}
+	if len(p) > 0 {
+		d.nx = copy(d.x[:], p)
+	}
+	return
+}
+
+func (d0 *digest) Sum(in []byte) []byte {
+	// Make a copy of d0 so that caller can keep writing and summing.
+	d := new(digest)
+	*d = *d0
+	hash := d.checkSum()
+	if d.is384 {
+		return append(in, hash[:Size384]...)
+	}
+	return append(in, hash[:]...)
+}
+
+func (d *digest) checkSum() [Size]byte {
+	// Padding.  Add a 1 bit and 0 bits until 112 bytes mod 128.
+	len := d.len
+	var tmp [128]byte
+	tmp[0] = 0x80
+	if len%128 < 112 {
+		d.Write(tmp[0 : 112-len%128])
+	} else {
+		d.Write(tmp[0 : 128+112-len%128])
+	}
+
+	// Length in bits.
+	len <<= 3
+	for i := uint(0); i < 16; i++ {
+		tmp[i] = byte(len >> (120 - 8*i))
+	}
+	d.Write(tmp[0:16])
+
+	if d.nx != 0 {
+		panic("d.nx != 0")
+	}
+
+	h := d.h[:]
+	if d.is384 {
+		h = d.h[:6]
+	}
+
+	var digest [Size]byte
+	for i, s := range h {
+		digest[i*8] = byte(s >> 56)
+		digest[i*8+1] = byte(s >> 48)
+		digest[i*8+2] = byte(s >> 40)
+		digest[i*8+3] = byte(s >> 32)
+		digest[i*8+4] = byte(s >> 24)
+		digest[i*8+5] = byte(s >> 16)
+		digest[i*8+6] = byte(s >> 8)
+		digest[i*8+7] = byte(s)
+	}
+
+	return digest
+}
+
+// Sum512 returns the SHA512 checksum of the data.
+func Sum512(data []byte) [Size]byte {
+	var d digest
+	d.Reset()
+	d.Write(data)
+	return d.checkSum()
+}
+
+// Sum384 returns the SHA384 checksum of the data.
+func Sum384(data []byte) (sum384 [Size384]byte) {
+	var d digest
+	d.is384 = true
+	d.Reset()
+	d.Write(data)
+	sum := d.checkSum()
+	copy(sum384[:], sum[:Size384])
+	return
+}
diff --git a/src/crypto/sha512/sha512_test.go b/src/crypto/sha512/sha512_test.go
new file mode 100644
index 000000000..541860f70
--- /dev/null
+++ b/src/crypto/sha512/sha512_test.go
@@ -0,0 +1,176 @@
+// 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 hash algorithm.  See FIPS 180-2.
+
+package sha512
+
+import (
+	"fmt"
+	"io"
+	"testing"
+)
+
+type sha512Test struct {
+	out string
+	in  string
+}
+
+var golden = []sha512Test{
+	{"cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e", ""},
+	{"1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75", "a"},
+	{"2d408a0717ec188158278a796c689044361dc6fdde28d6f04973b80896e1823975cdbf12eb63f9e0591328ee235d80e9b5bf1aa6a44f4617ff3caf6400eb172d", "ab"},
+	{"ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f", "abc"},
+	{"d8022f2060ad6efd297ab73dcc5355c9b214054b0d1776a136a669d26a7d3b14f73aa0d0ebff19ee333368f0164b6419a96da49e3e481753e7e96b716bdccb6f", "abcd"},
+	{"878ae65a92e86cac011a570d4c30a7eaec442b85ce8eca0c2952b5e3cc0628c2e79d889ad4d5c7c626986d452dd86374b6ffaa7cd8b67665bef2289a5c70b0a1", "abcde"},
+	{"e32ef19623e8ed9d267f657a81944b3d07adbb768518068e88435745564e8d4150a0a703be2a7d88b61e3d390c2bb97e2d4c311fdc69d6b1267f05f59aa920e7", "abcdef"},
+	{"d716a4188569b68ab1b6dfac178e570114cdf0ea3a1cc0e31486c3e41241bc6a76424e8c37ab26f096fc85ef9886c8cb634187f4fddff645fb099f1ff54c6b8c", "abcdefg"},
+	{"a3a8c81bc97c2560010d7389bc88aac974a104e0e2381220c6e084c4dccd1d2d17d4f86db31c2a851dc80e6681d74733c55dcd03dd96f6062cdda12a291ae6ce", "abcdefgh"},
+	{"f22d51d25292ca1d0f68f69aedc7897019308cc9db46efb75a03dd494fc7f126c010e8ade6a00a0c1a5f1b75d81e0ed5a93ce98dc9b833db7839247b1d9c24fe", "abcdefghi"},
+	{"ef6b97321f34b1fea2169a7db9e1960b471aa13302a988087357c520be957ca119c3ba68e6b4982c019ec89de3865ccf6a3cda1fe11e59f98d99f1502c8b9745", "abcdefghij"},
+	{"2210d99af9c8bdecda1b4beff822136753d8342505ddce37f1314e2cdbb488c6016bdaa9bd2ffa513dd5de2e4b50f031393d8ab61f773b0e0130d7381e0f8a1d", "Discard medicine more than two years old."},
+	{"a687a8985b4d8d0a24f115fe272255c6afaf3909225838546159c1ed685c211a203796ae8ecc4c81a5b6315919b3a64f10713da07e341fcdbb08541bf03066ce", "He who has a shady past knows that nice guys finish last."},
+	{"8ddb0392e818b7d585ab22769a50df660d9f6d559cca3afc5691b8ca91b8451374e42bcdabd64589ed7c91d85f626596228a5c8572677eb98bc6b624befb7af8", "I wouldn't marry him with a ten foot pole."},
+	{"26ed8f6ca7f8d44b6a8a54ae39640fa8ad5c673f70ee9ce074ba4ef0d483eea00bab2f61d8695d6b34df9c6c48ae36246362200ed820448bdc03a720366a87c6", "Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave"},
+	{"e5a14bf044be69615aade89afcf1ab0389d5fc302a884d403579d1386a2400c089b0dbb387ed0f463f9ee342f8244d5a38cfbc0e819da9529fbff78368c9a982", "The days of the digital watch are numbered.  -Tom Stoppard"},
+	{"420a1faa48919e14651bed45725abe0f7a58e0f099424c4e5a49194946e38b46c1f8034b18ef169b2e31050d1648e0b982386595f7df47da4b6fd18e55333015", "Nepal premier won't resign."},
+	{"d926a863beadb20134db07683535c72007b0e695045876254f341ddcccde132a908c5af57baa6a6a9c63e6649bba0c213dc05fadcf9abccea09f23dcfb637fbe", "For every action there is an equal and opposite government program."},
+	{"9a98dd9bb67d0da7bf83da5313dff4fd60a4bac0094f1b05633690ffa7f6d61de9a1d4f8617937d560833a9aaa9ccafe3fd24db418d0e728833545cadd3ad92d", "His money is twice tainted: 'taint yours and 'taint mine."},
+	{"d7fde2d2351efade52f4211d3746a0780a26eec3df9b2ed575368a8a1c09ec452402293a8ea4eceb5a4f60064ea29b13cdd86918cd7a4faf366160b009804107", "There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977"},
+	{"b0f35ffa2697359c33a56f5c0cf715c7aeed96da9905ca2698acadb08fbc9e669bf566b6bd5d61a3e86dc22999bcc9f2224e33d1d4f32a228cf9d0349e2db518", "It's a tiny change to the code and not completely disgusting. - Bob Manchek"},
+	{"3d2e5f91778c9e66f7e061293aaa8a8fc742dd3b2e4f483772464b1144189b49273e610e5cccd7a81a19ca1fa70f16b10f1a100a4d8c1372336be8484c64b311", "size:  a.out:  bad magic"},
+	{"b2f68ff58ac015efb1c94c908b0d8c2bf06f491e4de8e6302c49016f7f8a33eac3e959856c7fddbc464de618701338a4b46f76dbfaf9a1e5262b5f40639771c7", "The major problem is with sendmail.  -Mark Horton"},
+	{"d8c92db5fdf52cf8215e4df3b4909d29203ff4d00e9ad0b64a6a4e04dec5e74f62e7c35c7fb881bd5de95442123df8f57a489b0ae616bd326f84d10021121c57", "Give me a rock, paper and scissors and I will move the world.  CCFestoon"},
+	{"19a9f8dc0a233e464e8566ad3ca9b91e459a7b8c4780985b015776e1bf239a19bc233d0556343e2b0a9bc220900b4ebf4f8bdf89ff8efeaf79602d6849e6f72e", "If the enemy is within range, then so are you."},
+	{"00b4c41f307bde87301cdc5b5ab1ae9a592e8ecbb2021dd7bc4b34e2ace60741cc362560bec566ba35178595a91932b8d5357e2c9cec92d393b0fa7831852476", "It's well we cannot hear the screams/That we create in others' dreams."},
+	{"91eccc3d5375fd026e4d6787874b1dce201cecd8a27dbded5065728cb2d09c58a3d467bb1faf353bf7ba567e005245d5321b55bc344f7c07b91cb6f26c959be7", "You remind me of a TV show, but that's all right: I watch it anyway."},
+	{"fabbbe22180f1f137cfdc9556d2570e775d1ae02a597ded43a72a40f9b485d500043b7be128fb9fcd982b83159a0d99aa855a9e7cc4240c00dc01a9bdf8218d7", "C is as portable as Stonehedge!!"},
+	{"2ecdec235c1fa4fc2a154d8fba1dddb8a72a1ad73838b51d792331d143f8b96a9f6fcb0f34d7caa351fe6d88771c4f105040e0392f06e0621689d33b2f3ba92e", "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley"},
+	{"7ad681f6f96f82f7abfa7ecc0334e8fa16d3dc1cdc45b60b7af43fe4075d2357c0c1d60e98350f1afb1f2fe7a4d7cd2ad55b88e458e06b73c40b437331f5dab4", "The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction.  Lewis-Randall Rule"},
+	{"833f9248ab4a3b9e5131f745fda1ffd2dd435b30e965957e78291c7ab73605fd1912b0794e5c233ab0a12d205a39778d19b83515d6a47003f19cdee51d98c7e0", "How can you write a big system without C++?  -Paul Glick"},
+}
+
+var golden384 = []sha512Test{
+	{"38b060a751ac96384cd9327eb1b1e36a21fdb71114be07434c0cc7bf63f6e1da274edebfe76f65fbd51ad2f14898b95b", ""},
+	{"54a59b9f22b0b80880d8427e548b7c23abd873486e1f035dce9cd697e85175033caa88e6d57bc35efae0b5afd3145f31", "a"},
+	{"c7be03ba5bcaa384727076db0018e99248e1a6e8bd1b9ef58a9ec9dd4eeebb3f48b836201221175befa74ddc3d35afdd", "ab"},
+	{"cb00753f45a35e8bb5a03d699ac65007272c32ab0eded1631a8b605a43ff5bed8086072ba1e7cc2358baeca134c825a7", "abc"},
+	{"1165b3406ff0b52a3d24721f785462ca2276c9f454a116c2b2ba20171a7905ea5a026682eb659c4d5f115c363aa3c79b", "abcd"},
+	{"4c525cbeac729eaf4b4665815bc5db0c84fe6300068a727cf74e2813521565abc0ec57a37ee4d8be89d097c0d2ad52f0", "abcde"},
+	{"c6a4c65b227e7387b9c3e839d44869c4cfca3ef583dea64117859b808c1e3d8ae689e1e314eeef52a6ffe22681aa11f5", "abcdef"},
+	{"9f11fc131123f844c1226f429b6a0a6af0525d9f40f056c7fc16cdf1b06bda08e302554417a59fa7dcf6247421959d22", "abcdefg"},
+	{"9000cd7cada59d1d2eb82912f7f24e5e69cc5517f68283b005fa27c285b61e05edf1ad1a8a9bded6fd29eb87d75ad806", "abcdefgh"},
+	{"ef54915b60cf062b8dd0c29ae3cad69abe6310de63ac081f46ef019c5c90897caefd79b796cfa81139788a260ded52df", "abcdefghi"},
+	{"a12070030a02d86b0ddacd0d3a5b598344513d0a051e7355053e556a0055489c1555399b03342845c4adde2dc44ff66c", "abcdefghij"},
+	{"86f58ec2d74d1b7f8eb0c2ff0967316699639e8d4eb129de54bdf34c96cdbabe200d052149f2dd787f43571ba74670d4", "Discard medicine more than two years old."},
+	{"ae4a2b639ca9bfa04b1855d5a05fe7f230994f790891c6979103e2605f660c4c1262a48142dcbeb57a1914ba5f7c3fa7", "He who has a shady past knows that nice guys finish last."},
+	{"40ae213df6436eca952aa6841886fcdb82908ef1576a99c8f49bb9dd5023169f7c53035abdda0b54c302f4974e2105e7", "I wouldn't marry him with a ten foot pole."},
+	{"e7cf8b873c9bc950f06259aa54309f349cefa72c00d597aebf903e6519a50011dfe355afff064a10701c705693848df9", "Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave"},
+	{"c3d4f0f4047181c7d39d34703365f7bf70207183caf2c2f6145f04da895ef69124d9cdeb635da636c3a474e61024e29b", "The days of the digital watch are numbered.  -Tom Stoppard"},
+	{"a097aab567e167d5cf93676ed73252a69f9687cb3179bb2d27c9878119e94bf7b7c4b58dc90582edfaf66e11388ed714", "Nepal premier won't resign."},
+	{"5026ca45c41fc64712eb65065da92f6467541c78f8966d3fe2c8e3fb769a3ec14215f819654b47bd64f7f0eac17184f3", "For every action there is an equal and opposite government program."},
+	{"ac1cc0f5ac8d5f5514a7b738ac322b7fb52a161b449c3672e9b6a6ad1a5e4b26b001cf3bad24c56598676ca17d4b445a", "His money is twice tainted: 'taint yours and 'taint mine."},
+	{"722d10c5de371ec0c8c4b5247ac8a5f1d240d68c73f8da13d8b25f0166d6f309bf9561979a111a0049405771d201941a", "There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977"},
+	{"dc2d3ea18bfa10549c63bf2b75b39b5167a80c12aff0e05443168ea87ff149fb0eda5e0bd234eb5d48c7d02ffc5807f1", "It's a tiny change to the code and not completely disgusting. - Bob Manchek"},
+	{"1d67c969e2a945ae5346d2139760261504d4ba164c522443afe19ef3e29b152a4c52445489cfc9d7215e5a450e8e1e4e", "size:  a.out:  bad magic"},
+	{"5ff8e075e465646e7b73ef36d812c6e9f7d60fa6ea0e533e5569b4f73cde53cdd2cc787f33540af57cca3fe467d32fe0", "The major problem is with sendmail.  -Mark Horton"},
+	{"5bd0a997a67c9ae1979a894eb0cde403dde003c9b6f2c03cf21925c42ff4e1176e6df1ca005381612ef18457b9b7ec3b", "Give me a rock, paper and scissors and I will move the world.  CCFestoon"},
+	{"1eee6da33e7e54fc5be52ae23b94b16ba4d2a947ae4505c6a3edfc7401151ea5205ac01b669b56f27d8ef7f175ed7762", "If the enemy is within range, then so are you."},
+	{"76b06e9dea66bfbb1a96029426dc0dfd7830bd297eb447ff5358d94a87cd00c88b59df2493fef56ecbb5231073892ea9", "It's well we cannot hear the screams/That we create in others' dreams."},
+	{"12acaf21452cff586143e3f5db0bfdf7802c057e1adf2a619031c4e1b0ccc4208cf6cef8fe722bbaa2fb46a30d9135d8", "You remind me of a TV show, but that's all right: I watch it anyway."},
+	{"0fc23d7f4183efd186f0bc4fc5db867e026e2146b06cb3d52f4bdbd57d1740122caa853b41868b197b2ac759db39df88", "C is as portable as Stonehedge!!"},
+	{"bc805578a7f85d34a86a32976e1c34fe65cf815186fbef76f46ef99cda10723f971f3f1464d488243f5e29db7488598d", "Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley"},
+	{"b23918399a12ebf4431559eec3813eaf7412e875fd7464f16d581e473330842d2e96c6be49a7ce3f9bb0b8bc0fcbe0fe", "The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction.  Lewis-Randall Rule"},
+	{"1764b700eb1ead52a2fc33cc28975c2180f1b8faa5038d94cffa8d78154aab16e91dd787e7b0303948ebed62561542c8", "How can you write a big system without C++?  -Paul Glick"},
+}
+
+func TestGolden(t *testing.T) {
+	for i := 0; i < len(golden); i++ {
+		g := golden[i]
+		s := fmt.Sprintf("%x", Sum512([]byte(g.in)))
+		if s != g.out {
+			t.Fatalf("Sum512 function: sha512(%s) = %s want %s", g.in, s, g.out)
+		}
+		c := New()
+		for j := 0; j < 3; j++ {
+			if j < 2 {
+				io.WriteString(c, g.in)
+			} else {
+				io.WriteString(c, g.in[0:len(g.in)/2])
+				c.Sum(nil)
+				io.WriteString(c, g.in[len(g.in)/2:])
+			}
+			s := fmt.Sprintf("%x", c.Sum(nil))
+			if s != g.out {
+				t.Fatalf("sha512[%d](%s) = %s want %s", j, g.in, s, g.out)
+			}
+			c.Reset()
+		}
+	}
+	for i := 0; i < len(golden384); i++ {
+		g := golden384[i]
+		s := fmt.Sprintf("%x", Sum384([]byte(g.in)))
+		if s != g.out {
+			t.Fatalf("Sum384 function: sha384(%s) = %s want %s", g.in, s, g.out)
+		}
+		c := New384()
+		for j := 0; j < 3; j++ {
+			if j < 2 {
+				io.WriteString(c, g.in)
+			} else {
+				io.WriteString(c, g.in[0:len(g.in)/2])
+				c.Sum(nil)
+				io.WriteString(c, g.in[len(g.in)/2:])
+			}
+			s := fmt.Sprintf("%x", c.Sum(nil))
+			if s != g.out {
+				t.Fatalf("sha384[%d](%s) = %s want %s", j, g.in, s, g.out)
+			}
+			c.Reset()
+		}
+	}
+}
+
+func TestSize(t *testing.T) {
+	c := New()
+	if got := c.Size(); got != Size {
+		t.Errorf("Size = %d; want %d", got, Size)
+	}
+	c = New384()
+	if got := c.Size(); got != Size384 {
+		t.Errorf("New384.Size = %d; want %d", got, Size384)
+	}
+}
+
+func TestBlockSize(t *testing.T) {
+	c := New()
+	if got := c.BlockSize(); got != BlockSize {
+		t.Errorf("BlockSize = %d; want %d", got, BlockSize)
+	}
+}
+
+var bench = New()
+var buf = make([]byte, 8192)
+
+func benchmarkSize(b *testing.B, size int) {
+	b.SetBytes(int64(size))
+	sum := make([]byte, bench.Size())
+	for i := 0; i < b.N; i++ {
+		bench.Reset()
+		bench.Write(buf[:size])
+		bench.Sum(sum[:0])
+	}
+}
+
+func BenchmarkHash8Bytes(b *testing.B) {
+	benchmarkSize(b, 8)
+}
+
+func BenchmarkHash1K(b *testing.B) {
+	benchmarkSize(b, 1024)
+}
+
+func BenchmarkHash8K(b *testing.B) {
+	benchmarkSize(b, 8192)
+}
diff --git a/src/crypto/sha512/sha512block.go b/src/crypto/sha512/sha512block.go
new file mode 100644
index 000000000..648ae8f7e
--- /dev/null
+++ b/src/crypto/sha512/sha512block.go
@@ -0,0 +1,144 @@
+// 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.
+
+// +build !amd64
+
+// 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) {
+	var w [80]uint64
+	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++ {
+			v1 := w[i-2]
+			t1 := (v1>>19 | v1<<(64-19)) ^ (v1>>61 | v1<<(64-61)) ^ (v1 >> 6)
+			v2 := w[i-15]
+			t2 := (v2>>1 | v2<<(64-1)) ^ (v2>>8 | v2<<(64-8)) ^ (v2 >> 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:]
+	}
+
+	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
+}
diff --git a/src/crypto/sha512/sha512block_amd64.s b/src/crypto/sha512/sha512block_amd64.s
new file mode 100644
index 000000000..2e10233de
--- /dev/null
+++ b/src/crypto/sha512/sha512block_amd64.s
@@ -0,0 +1,273 @@
+// Copyright 2013 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.
+
+#include "textflag.h"
+
+// SHA512 block routine. See sha512block.go for Go equivalent.
+//
+// The algorithm is detailed in FIPS 180-4:
+//
+//  http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
+//
+// Wt = Mt; for 0 <= t <= 15
+// Wt = SIGMA1(Wt-2) + SIGMA0(Wt-15) + Wt-16; for 16 <= t <= 79
+//
+// a = H0
+// b = H1
+// c = H2
+// d = H3
+// e = H4
+// f = H5
+// g = H6
+// h = H7
+//
+// for t = 0 to 79 {
+//    T1 = h + BIGSIGMA1(e) + Ch(e,f,g) + Kt + Wt
+//    T2 = BIGSIGMA0(a) + Maj(a,b,c)
+//    h = g
+//    g = f
+//    f = e
+//    e = d + T1
+//    d = c
+//    c = b
+//    b = a
+//    a = T1 + T2
+// }
+//
+// H0 = a + H0
+// H1 = b + H1
+// H2 = c + H2
+// H3 = d + H3
+// H4 = e + H4
+// H5 = f + H5
+// H6 = g + H6
+// H7 = h + H7
+
+// Wt = Mt; for 0 <= t <= 15
+#define MSGSCHEDULE0(index) \
+	MOVQ	(index*8)(SI), AX; \
+	BSWAPQ	AX; \
+	MOVQ	AX, (index*8)(BP)
+
+// Wt = SIGMA1(Wt-2) + Wt-7 + SIGMA0(Wt-15) + Wt-16; for 16 <= t <= 79
+//   SIGMA0(x) = ROTR(1,x) XOR ROTR(8,x) XOR SHR(7,x)
+//   SIGMA1(x) = ROTR(19,x) XOR ROTR(61,x) XOR SHR(6,x)
+#define MSGSCHEDULE1(index) \
+	MOVQ	((index-2)*8)(BP), AX; \
+	MOVQ	AX, CX; \
+	RORQ	$19, AX; \
+	MOVQ	CX, DX; \
+	RORQ	$61, CX; \
+	SHRQ	$6, DX; \
+	MOVQ	((index-15)*8)(BP), BX; \
+	XORQ	CX, AX; \
+	MOVQ	BX, CX; \
+	XORQ	DX, AX; \
+	RORQ	$1, BX; \
+	MOVQ	CX, DX; \
+	SHRQ	$7, DX; \
+	RORQ	$8, CX; \
+	ADDQ	((index-7)*8)(BP), AX; \
+	XORQ	CX, BX; \
+	XORQ	DX, BX; \
+	ADDQ	((index-16)*8)(BP), BX; \
+	ADDQ	BX, AX; \
+	MOVQ	AX, ((index)*8)(BP)
+
+// Calculate T1 in AX - uses AX, CX and DX registers.
+// h is also used as an accumulator. Wt is passed in AX.
+//   T1 = h + BIGSIGMA1(e) + Ch(e, f, g) + Kt + Wt
+//     BIGSIGMA1(x) = ROTR(14,x) XOR ROTR(18,x) XOR ROTR(41,x)
+//     Ch(x, y, z) = (x AND y) XOR (NOT x AND z)
+#define SHA512T1(const, e, f, g, h) \
+	MOVQ	$const, DX; \
+	ADDQ	AX, h; \
+	MOVQ	e, AX; \
+	ADDQ	DX, h; \
+	MOVQ	e, CX; \
+	RORQ	$14, AX; \
+	MOVQ	e, DX; \
+	RORQ	$18, CX; \
+	XORQ	CX, AX; \
+	MOVQ	e, CX; \
+	RORQ	$41, DX; \
+	ANDQ	f, CX; \
+	XORQ	AX, DX; \
+	MOVQ	e, AX; \
+	NOTQ	AX; \
+	ADDQ	DX, h; \
+	ANDQ	g, AX; \
+	XORQ	CX, AX; \
+	ADDQ	h, AX
+
+// Calculate T2 in BX - uses BX, CX, DX and DI registers.
+//   T2 = BIGSIGMA0(a) + Maj(a, b, c)
+//     BIGSIGMA0(x) = ROTR(28,x) XOR ROTR(34,x) XOR ROTR(39,x)
+//     Maj(x, y, z) = (x AND y) XOR (x AND z) XOR (y AND z)
+#define SHA512T2(a, b, c) \
+	MOVQ	a, DI; \
+	MOVQ	c, BX; \
+	RORQ	$28, DI; \
+	MOVQ	a, DX; \
+	ANDQ	b, BX; \
+	RORQ	$34, DX; \
+	MOVQ	a, CX; \
+	ANDQ	c, CX; \
+	XORQ	DX, DI; \
+	XORQ	CX, BX; \
+	MOVQ	a, DX; \
+	MOVQ	b, CX; \
+	RORQ	$39, DX; \
+	ANDQ	a, CX; \
+	XORQ	CX, BX; \
+	XORQ	DX, DI; \
+	ADDQ	DI, BX
+
+// Calculate T1 and T2, then e = d + T1 and a = T1 + T2.
+// The values for e and a are stored in d and h, ready for rotation.
+#define SHA512ROUND(index, const, a, b, c, d, e, f, g, h) \
+	SHA512T1(const, e, f, g, h); \
+	SHA512T2(a, b, c); \
+	MOVQ	BX, h; \
+	ADDQ	AX, d; \
+	ADDQ	AX, h
+
+#define SHA512ROUND0(index, const, a, b, c, d, e, f, g, h) \
+	MSGSCHEDULE0(index); \
+	SHA512ROUND(index, const, a, b, c, d, e, f, g, h)
+
+#define SHA512ROUND1(index, const, a, b, c, d, e, f, g, h) \
+	MSGSCHEDULE1(index); \
+	SHA512ROUND(index, const, a, b, c, d, e, f, g, h)
+
+TEXT ·block(SB),0,$648-32
+	MOVQ	p_base+8(FP), SI
+	MOVQ	p_len+16(FP), DX
+	SHRQ	$7, DX
+	SHLQ	$7, DX
+
+	LEAQ	(SI)(DX*1), DI
+	MOVQ	DI, 640(SP)
+	CMPQ	SI, DI
+	JEQ	end
+
+	MOVQ	dig+0(FP), BP
+	MOVQ	(0*8)(BP), R8		// a = H0
+	MOVQ	(1*8)(BP), R9		// b = H1
+	MOVQ	(2*8)(BP), R10		// c = H2
+	MOVQ	(3*8)(BP), R11		// d = H3
+	MOVQ	(4*8)(BP), R12		// e = H4
+	MOVQ	(5*8)(BP), R13		// f = H5
+	MOVQ	(6*8)(BP), R14		// g = H6
+	MOVQ	(7*8)(BP), R15		// h = H7
+
+loop:
+	MOVQ	SP, BP			// message schedule
+
+	SHA512ROUND0(0, 0x428a2f98d728ae22, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND0(1, 0x7137449123ef65cd, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND0(2, 0xb5c0fbcfec4d3b2f, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND0(3, 0xe9b5dba58189dbbc, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND0(4, 0x3956c25bf348b538, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND0(5, 0x59f111f1b605d019, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND0(6, 0x923f82a4af194f9b, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND0(7, 0xab1c5ed5da6d8118, R9, R10, R11, R12, R13, R14, R15, R8)
+	SHA512ROUND0(8, 0xd807aa98a3030242, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND0(9, 0x12835b0145706fbe, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND0(10, 0x243185be4ee4b28c, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND0(11, 0x550c7dc3d5ffb4e2, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND0(12, 0x72be5d74f27b896f, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND0(13, 0x80deb1fe3b1696b1, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND0(14, 0x9bdc06a725c71235, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND0(15, 0xc19bf174cf692694, R9, R10, R11, R12, R13, R14, R15, R8)
+
+	SHA512ROUND1(16, 0xe49b69c19ef14ad2, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND1(17, 0xefbe4786384f25e3, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND1(18, 0x0fc19dc68b8cd5b5, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND1(19, 0x240ca1cc77ac9c65, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND1(20, 0x2de92c6f592b0275, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND1(21, 0x4a7484aa6ea6e483, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND1(22, 0x5cb0a9dcbd41fbd4, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND1(23, 0x76f988da831153b5, R9, R10, R11, R12, R13, R14, R15, R8)
+	SHA512ROUND1(24, 0x983e5152ee66dfab, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND1(25, 0xa831c66d2db43210, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND1(26, 0xb00327c898fb213f, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND1(27, 0xbf597fc7beef0ee4, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND1(28, 0xc6e00bf33da88fc2, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND1(29, 0xd5a79147930aa725, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND1(30, 0x06ca6351e003826f, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND1(31, 0x142929670a0e6e70, R9, R10, R11, R12, R13, R14, R15, R8)
+	SHA512ROUND1(32, 0x27b70a8546d22ffc, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND1(33, 0x2e1b21385c26c926, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND1(34, 0x4d2c6dfc5ac42aed, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND1(35, 0x53380d139d95b3df, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND1(36, 0x650a73548baf63de, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND1(37, 0x766a0abb3c77b2a8, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND1(38, 0x81c2c92e47edaee6, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND1(39, 0x92722c851482353b, R9, R10, R11, R12, R13, R14, R15, R8)
+	SHA512ROUND1(40, 0xa2bfe8a14cf10364, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND1(41, 0xa81a664bbc423001, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND1(42, 0xc24b8b70d0f89791, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND1(43, 0xc76c51a30654be30, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND1(44, 0xd192e819d6ef5218, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND1(45, 0xd69906245565a910, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND1(46, 0xf40e35855771202a, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND1(47, 0x106aa07032bbd1b8, R9, R10, R11, R12, R13, R14, R15, R8)
+	SHA512ROUND1(48, 0x19a4c116b8d2d0c8, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND1(49, 0x1e376c085141ab53, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND1(50, 0x2748774cdf8eeb99, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND1(51, 0x34b0bcb5e19b48a8, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND1(52, 0x391c0cb3c5c95a63, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND1(53, 0x4ed8aa4ae3418acb, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND1(54, 0x5b9cca4f7763e373, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND1(55, 0x682e6ff3d6b2b8a3, R9, R10, R11, R12, R13, R14, R15, R8)
+	SHA512ROUND1(56, 0x748f82ee5defb2fc, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND1(57, 0x78a5636f43172f60, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND1(58, 0x84c87814a1f0ab72, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND1(59, 0x8cc702081a6439ec, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND1(60, 0x90befffa23631e28, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND1(61, 0xa4506cebde82bde9, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND1(62, 0xbef9a3f7b2c67915, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND1(63, 0xc67178f2e372532b, R9, R10, R11, R12, R13, R14, R15, R8)
+	SHA512ROUND1(64, 0xca273eceea26619c, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND1(65, 0xd186b8c721c0c207, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND1(66, 0xeada7dd6cde0eb1e, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND1(67, 0xf57d4f7fee6ed178, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND1(68, 0x06f067aa72176fba, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND1(69, 0x0a637dc5a2c898a6, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND1(70, 0x113f9804bef90dae, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND1(71, 0x1b710b35131c471b, R9, R10, R11, R12, R13, R14, R15, R8)
+	SHA512ROUND1(72, 0x28db77f523047d84, R8, R9, R10, R11, R12, R13, R14, R15)
+	SHA512ROUND1(73, 0x32caab7b40c72493, R15, R8, R9, R10, R11, R12, R13, R14)
+	SHA512ROUND1(74, 0x3c9ebe0a15c9bebc, R14, R15, R8, R9, R10, R11, R12, R13)
+	SHA512ROUND1(75, 0x431d67c49c100d4c, R13, R14, R15, R8, R9, R10, R11, R12)
+	SHA512ROUND1(76, 0x4cc5d4becb3e42b6, R12, R13, R14, R15, R8, R9, R10, R11)
+	SHA512ROUND1(77, 0x597f299cfc657e2a, R11, R12, R13, R14, R15, R8, R9, R10)
+	SHA512ROUND1(78, 0x5fcb6fab3ad6faec, R10, R11, R12, R13, R14, R15, R8, R9)
+	SHA512ROUND1(79, 0x6c44198c4a475817, R9, R10, R11, R12, R13, R14, R15, R8)
+
+	MOVQ	dig+0(FP), BP
+	ADDQ	(0*8)(BP), R8	// H0 = a + H0
+	MOVQ	R8, (0*8)(BP)
+	ADDQ	(1*8)(BP), R9	// H1 = b + H1
+	MOVQ	R9, (1*8)(BP)
+	ADDQ	(2*8)(BP), R10	// H2 = c + H2
+	MOVQ	R10, (2*8)(BP)
+	ADDQ	(3*8)(BP), R11	// H3 = d + H3
+	MOVQ	R11, (3*8)(BP)
+	ADDQ	(4*8)(BP), R12	// H4 = e + H4
+	MOVQ	R12, (4*8)(BP)
+	ADDQ	(5*8)(BP), R13	// H5 = f + H5
+	MOVQ	R13, (5*8)(BP)
+	ADDQ	(6*8)(BP), R14	// H6 = g + H6
+	MOVQ	R14, (6*8)(BP)
+	ADDQ	(7*8)(BP), R15	// H7 = h + H7
+	MOVQ	R15, (7*8)(BP)
+
+	ADDQ	$128, SI
+	CMPQ	SI, 640(SP)
+	JB	loop
+
+end:
+	RET
diff --git a/src/crypto/sha512/sha512block_decl.go b/src/crypto/sha512/sha512block_decl.go
new file mode 100644
index 000000000..bef99de2e
--- /dev/null
+++ b/src/crypto/sha512/sha512block_decl.go
@@ -0,0 +1,11 @@
+// Copyright 2013 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.
+
+// +build amd64
+
+package sha512
+
+//go:noescape
+
+func block(dig *digest, p []byte)