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-rw-r--r--crypto/sha3/LICENSE27
-rw-r--r--crypto/sha3/PATENTS22
-rw-r--r--crypto/sha3/doc.go66
-rw-r--r--crypto/sha3/hashes.go65
-rw-r--r--crypto/sha3/keccakf.go410
-rw-r--r--crypto/sha3/register.go18
-rw-r--r--crypto/sha3/sha3.go193
-rw-r--r--crypto/sha3/sha3_test.go306
-rw-r--r--crypto/sha3/shake.go60
-rw-r--r--crypto/sha3/testdata/keccakKats.json.deflatebin0 -> 521342 bytes
-rw-r--r--crypto/sha3/xor.go16
-rw-r--r--crypto/sha3/xor_generic.go28
-rw-r--r--crypto/sha3/xor_unaligned.go58
13 files changed, 1269 insertions, 0 deletions
diff --git a/crypto/sha3/LICENSE b/crypto/sha3/LICENSE
new file mode 100644
index 000000000..6a66aea5e
--- /dev/null
+++ b/crypto/sha3/LICENSE
@@ -0,0 +1,27 @@
+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.
diff --git a/crypto/sha3/PATENTS b/crypto/sha3/PATENTS
new file mode 100644
index 000000000..733099041
--- /dev/null
+++ b/crypto/sha3/PATENTS
@@ -0,0 +1,22 @@
+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the Go project.
+
+Google hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section)
+patent license to make, have made, use, offer to sell, sell, import,
+transfer and otherwise run, modify and propagate the contents of this
+implementation of Go, where such license applies only to those patent
+claims, both currently owned or controlled by Google and acquired in
+the future, licensable by Google that are necessarily infringed by this
+implementation of Go. This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation. If you or your agent or exclusive licensee institute or
+order or agree to the institution of patent litigation against any
+entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that this implementation of Go or any code incorporated within this
+implementation of Go constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of Go
+shall terminate as of the date such litigation is filed.
diff --git a/crypto/sha3/doc.go b/crypto/sha3/doc.go
new file mode 100644
index 000000000..a0ee3ae72
--- /dev/null
+++ b/crypto/sha3/doc.go
@@ -0,0 +1,66 @@
+// Copyright 2014 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 sha3 implements the SHA-3 fixed-output-length hash functions and
+// the SHAKE variable-output-length hash functions defined by FIPS-202.
+//
+// Both types of hash function use the "sponge" construction and the Keccak
+// permutation. For a detailed specification see http://keccak.noekeon.org/
+//
+//
+// Guidance
+//
+// If you aren't sure what function you need, use SHAKE256 with at least 64
+// bytes of output. The SHAKE instances are faster than the SHA3 instances;
+// the latter have to allocate memory to conform to the hash.Hash interface.
+//
+// If you need a secret-key MAC (message authentication code), prepend the
+// secret key to the input, hash with SHAKE256 and read at least 32 bytes of
+// output.
+//
+//
+// Security strengths
+//
+// The SHA3-x (x equals 224, 256, 384, or 512) functions have a security
+// strength against preimage attacks of x bits. Since they only produce "x"
+// bits of output, their collision-resistance is only "x/2" bits.
+//
+// The SHAKE-256 and -128 functions have a generic security strength of 256 and
+// 128 bits against all attacks, provided that at least 2x bits of their output
+// is used. Requesting more than 64 or 32 bytes of output, respectively, does
+// not increase the collision-resistance of the SHAKE functions.
+//
+//
+// The sponge construction
+//
+// A sponge builds a pseudo-random function from a public pseudo-random
+// permutation, by applying the permutation to a state of "rate + capacity"
+// bytes, but hiding "capacity" of the bytes.
+//
+// A sponge starts out with a zero state. To hash an input using a sponge, up
+// to "rate" bytes of the input are XORed into the sponge's state. The sponge
+// is then "full" and the permutation is applied to "empty" it. This process is
+// repeated until all the input has been "absorbed". The input is then padded.
+// The digest is "squeezed" from the sponge in the same way, except that output
+// output is copied out instead of input being XORed in.
+//
+// A sponge is parameterized by its generic security strength, which is equal
+// to half its capacity; capacity + rate is equal to the permutation's width.
+// Since the KeccakF-1600 permutation is 1600 bits (200 bytes) wide, this means
+// that the security strength of a sponge instance is equal to (1600 - bitrate) / 2.
+//
+//
+// Recommendations
+//
+// The SHAKE functions are recommended for most new uses. They can produce
+// output of arbitrary length. SHAKE256, with an output length of at least
+// 64 bytes, provides 256-bit security against all attacks. The Keccak team
+// recommends it for most applications upgrading from SHA2-512. (NIST chose a
+// much stronger, but much slower, sponge instance for SHA3-512.)
+//
+// The SHA-3 functions are "drop-in" replacements for the SHA-2 functions.
+// They produce output of the same length, with the same security strengths
+// against all attacks. This means, in particular, that SHA3-256 only has
+// 128-bit collision resistance, because its output length is 32 bytes.
+package sha3 // import "golang.org/x/crypto/sha3"
diff --git a/crypto/sha3/hashes.go b/crypto/sha3/hashes.go
new file mode 100644
index 000000000..2b51cf4e9
--- /dev/null
+++ b/crypto/sha3/hashes.go
@@ -0,0 +1,65 @@
+// Copyright 2014 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 sha3
+
+// This file provides functions for creating instances of the SHA-3
+// and SHAKE hash functions, as well as utility functions for hashing
+// bytes.
+
+import (
+ "hash"
+)
+
+// New224 creates a new SHA3-224 hash.
+// Its generic security strength is 224 bits against preimage attacks,
+// and 112 bits against collision attacks.
+func New224() hash.Hash { return &state{rate: 144, outputLen: 28, dsbyte: 0x06} }
+
+// New256 creates a new SHA3-256 hash.
+// Its generic security strength is 256 bits against preimage attacks,
+// and 128 bits against collision attacks.
+func New256() hash.Hash { return &state{rate: 136, outputLen: 32, dsbyte: 0x06} }
+
+// New384 creates a new SHA3-384 hash.
+// Its generic security strength is 384 bits against preimage attacks,
+// and 192 bits against collision attacks.
+func New384() hash.Hash { return &state{rate: 104, outputLen: 48, dsbyte: 0x06} }
+
+// New512 creates a new SHA3-512 hash.
+// Its generic security strength is 512 bits against preimage attacks,
+// and 256 bits against collision attacks.
+func New512() hash.Hash { return &state{rate: 72, outputLen: 64, dsbyte: 0x06} }
+
+// Sum224 returns the SHA3-224 digest of the data.
+func Sum224(data []byte) (digest [28]byte) {
+ h := New224()
+ h.Write(data)
+ h.Sum(digest[:0])
+ return
+}
+
+// Sum256 returns the SHA3-256 digest of the data.
+func Sum256(data []byte) (digest [32]byte) {
+ h := New256()
+ h.Write(data)
+ h.Sum(digest[:0])
+ return
+}
+
+// Sum384 returns the SHA3-384 digest of the data.
+func Sum384(data []byte) (digest [48]byte) {
+ h := New384()
+ h.Write(data)
+ h.Sum(digest[:0])
+ return
+}
+
+// Sum512 returns the SHA3-512 digest of the data.
+func Sum512(data []byte) (digest [64]byte) {
+ h := New512()
+ h.Write(data)
+ h.Sum(digest[:0])
+ return
+}
diff --git a/crypto/sha3/keccakf.go b/crypto/sha3/keccakf.go
new file mode 100644
index 000000000..13e7058fa
--- /dev/null
+++ b/crypto/sha3/keccakf.go
@@ -0,0 +1,410 @@
+// Copyright 2014 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 sha3
+
+// rc stores the round constants for use in the ι step.
+var rc = [24]uint64{
+ 0x0000000000000001,
+ 0x0000000000008082,
+ 0x800000000000808A,
+ 0x8000000080008000,
+ 0x000000000000808B,
+ 0x0000000080000001,
+ 0x8000000080008081,
+ 0x8000000000008009,
+ 0x000000000000008A,
+ 0x0000000000000088,
+ 0x0000000080008009,
+ 0x000000008000000A,
+ 0x000000008000808B,
+ 0x800000000000008B,
+ 0x8000000000008089,
+ 0x8000000000008003,
+ 0x8000000000008002,
+ 0x8000000000000080,
+ 0x000000000000800A,
+ 0x800000008000000A,
+ 0x8000000080008081,
+ 0x8000000000008080,
+ 0x0000000080000001,
+ 0x8000000080008008,
+}
+
+// keccakF1600 applies the Keccak permutation to a 1600b-wide
+// state represented as a slice of 25 uint64s.
+func keccakF1600(a *[25]uint64) {
+ // Implementation translated from Keccak-inplace.c
+ // in the keccak reference code.
+ var t, bc0, bc1, bc2, bc3, bc4, d0, d1, d2, d3, d4 uint64
+
+ for i := 0; i < 24; i += 4 {
+ // Combines the 5 steps in each round into 2 steps.
+ // Unrolls 4 rounds per loop and spreads some steps across rounds.
+
+ // Round 1
+ bc0 = a[0] ^ a[5] ^ a[10] ^ a[15] ^ a[20]
+ bc1 = a[1] ^ a[6] ^ a[11] ^ a[16] ^ a[21]
+ bc2 = a[2] ^ a[7] ^ a[12] ^ a[17] ^ a[22]
+ bc3 = a[3] ^ a[8] ^ a[13] ^ a[18] ^ a[23]
+ bc4 = a[4] ^ a[9] ^ a[14] ^ a[19] ^ a[24]
+ d0 = bc4 ^ (bc1<<1 | bc1>>63)
+ d1 = bc0 ^ (bc2<<1 | bc2>>63)
+ d2 = bc1 ^ (bc3<<1 | bc3>>63)
+ d3 = bc2 ^ (bc4<<1 | bc4>>63)
+ d4 = bc3 ^ (bc0<<1 | bc0>>63)
+
+ bc0 = a[0] ^ d0
+ t = a[6] ^ d1
+ bc1 = t<<44 | t>>(64-44)
+ t = a[12] ^ d2
+ bc2 = t<<43 | t>>(64-43)
+ t = a[18] ^ d3
+ bc3 = t<<21 | t>>(64-21)
+ t = a[24] ^ d4
+ bc4 = t<<14 | t>>(64-14)
+ a[0] = bc0 ^ (bc2 &^ bc1) ^ rc[i]
+ a[6] = bc1 ^ (bc3 &^ bc2)
+ a[12] = bc2 ^ (bc4 &^ bc3)
+ a[18] = bc3 ^ (bc0 &^ bc4)
+ a[24] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[10] ^ d0
+ bc2 = t<<3 | t>>(64-3)
+ t = a[16] ^ d1
+ bc3 = t<<45 | t>>(64-45)
+ t = a[22] ^ d2
+ bc4 = t<<61 | t>>(64-61)
+ t = a[3] ^ d3
+ bc0 = t<<28 | t>>(64-28)
+ t = a[9] ^ d4
+ bc1 = t<<20 | t>>(64-20)
+ a[10] = bc0 ^ (bc2 &^ bc1)
+ a[16] = bc1 ^ (bc3 &^ bc2)
+ a[22] = bc2 ^ (bc4 &^ bc3)
+ a[3] = bc3 ^ (bc0 &^ bc4)
+ a[9] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[20] ^ d0
+ bc4 = t<<18 | t>>(64-18)
+ t = a[1] ^ d1
+ bc0 = t<<1 | t>>(64-1)
+ t = a[7] ^ d2
+ bc1 = t<<6 | t>>(64-6)
+ t = a[13] ^ d3
+ bc2 = t<<25 | t>>(64-25)
+ t = a[19] ^ d4
+ bc3 = t<<8 | t>>(64-8)
+ a[20] = bc0 ^ (bc2 &^ bc1)
+ a[1] = bc1 ^ (bc3 &^ bc2)
+ a[7] = bc2 ^ (bc4 &^ bc3)
+ a[13] = bc3 ^ (bc0 &^ bc4)
+ a[19] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[5] ^ d0
+ bc1 = t<<36 | t>>(64-36)
+ t = a[11] ^ d1
+ bc2 = t<<10 | t>>(64-10)
+ t = a[17] ^ d2
+ bc3 = t<<15 | t>>(64-15)
+ t = a[23] ^ d3
+ bc4 = t<<56 | t>>(64-56)
+ t = a[4] ^ d4
+ bc0 = t<<27 | t>>(64-27)
+ a[5] = bc0 ^ (bc2 &^ bc1)
+ a[11] = bc1 ^ (bc3 &^ bc2)
+ a[17] = bc2 ^ (bc4 &^ bc3)
+ a[23] = bc3 ^ (bc0 &^ bc4)
+ a[4] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[15] ^ d0
+ bc3 = t<<41 | t>>(64-41)
+ t = a[21] ^ d1
+ bc4 = t<<2 | t>>(64-2)
+ t = a[2] ^ d2
+ bc0 = t<<62 | t>>(64-62)
+ t = a[8] ^ d3
+ bc1 = t<<55 | t>>(64-55)
+ t = a[14] ^ d4
+ bc2 = t<<39 | t>>(64-39)
+ a[15] = bc0 ^ (bc2 &^ bc1)
+ a[21] = bc1 ^ (bc3 &^ bc2)
+ a[2] = bc2 ^ (bc4 &^ bc3)
+ a[8] = bc3 ^ (bc0 &^ bc4)
+ a[14] = bc4 ^ (bc1 &^ bc0)
+
+ // Round 2
+ bc0 = a[0] ^ a[5] ^ a[10] ^ a[15] ^ a[20]
+ bc1 = a[1] ^ a[6] ^ a[11] ^ a[16] ^ a[21]
+ bc2 = a[2] ^ a[7] ^ a[12] ^ a[17] ^ a[22]
+ bc3 = a[3] ^ a[8] ^ a[13] ^ a[18] ^ a[23]
+ bc4 = a[4] ^ a[9] ^ a[14] ^ a[19] ^ a[24]
+ d0 = bc4 ^ (bc1<<1 | bc1>>63)
+ d1 = bc0 ^ (bc2<<1 | bc2>>63)
+ d2 = bc1 ^ (bc3<<1 | bc3>>63)
+ d3 = bc2 ^ (bc4<<1 | bc4>>63)
+ d4 = bc3 ^ (bc0<<1 | bc0>>63)
+
+ bc0 = a[0] ^ d0
+ t = a[16] ^ d1
+ bc1 = t<<44 | t>>(64-44)
+ t = a[7] ^ d2
+ bc2 = t<<43 | t>>(64-43)
+ t = a[23] ^ d3
+ bc3 = t<<21 | t>>(64-21)
+ t = a[14] ^ d4
+ bc4 = t<<14 | t>>(64-14)
+ a[0] = bc0 ^ (bc2 &^ bc1) ^ rc[i+1]
+ a[16] = bc1 ^ (bc3 &^ bc2)
+ a[7] = bc2 ^ (bc4 &^ bc3)
+ a[23] = bc3 ^ (bc0 &^ bc4)
+ a[14] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[20] ^ d0
+ bc2 = t<<3 | t>>(64-3)
+ t = a[11] ^ d1
+ bc3 = t<<45 | t>>(64-45)
+ t = a[2] ^ d2
+ bc4 = t<<61 | t>>(64-61)
+ t = a[18] ^ d3
+ bc0 = t<<28 | t>>(64-28)
+ t = a[9] ^ d4
+ bc1 = t<<20 | t>>(64-20)
+ a[20] = bc0 ^ (bc2 &^ bc1)
+ a[11] = bc1 ^ (bc3 &^ bc2)
+ a[2] = bc2 ^ (bc4 &^ bc3)
+ a[18] = bc3 ^ (bc0 &^ bc4)
+ a[9] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[15] ^ d0
+ bc4 = t<<18 | t>>(64-18)
+ t = a[6] ^ d1
+ bc0 = t<<1 | t>>(64-1)
+ t = a[22] ^ d2
+ bc1 = t<<6 | t>>(64-6)
+ t = a[13] ^ d3
+ bc2 = t<<25 | t>>(64-25)
+ t = a[4] ^ d4
+ bc3 = t<<8 | t>>(64-8)
+ a[15] = bc0 ^ (bc2 &^ bc1)
+ a[6] = bc1 ^ (bc3 &^ bc2)
+ a[22] = bc2 ^ (bc4 &^ bc3)
+ a[13] = bc3 ^ (bc0 &^ bc4)
+ a[4] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[10] ^ d0
+ bc1 = t<<36 | t>>(64-36)
+ t = a[1] ^ d1
+ bc2 = t<<10 | t>>(64-10)
+ t = a[17] ^ d2
+ bc3 = t<<15 | t>>(64-15)
+ t = a[8] ^ d3
+ bc4 = t<<56 | t>>(64-56)
+ t = a[24] ^ d4
+ bc0 = t<<27 | t>>(64-27)
+ a[10] = bc0 ^ (bc2 &^ bc1)
+ a[1] = bc1 ^ (bc3 &^ bc2)
+ a[17] = bc2 ^ (bc4 &^ bc3)
+ a[8] = bc3 ^ (bc0 &^ bc4)
+ a[24] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[5] ^ d0
+ bc3 = t<<41 | t>>(64-41)
+ t = a[21] ^ d1
+ bc4 = t<<2 | t>>(64-2)
+ t = a[12] ^ d2
+ bc0 = t<<62 | t>>(64-62)
+ t = a[3] ^ d3
+ bc1 = t<<55 | t>>(64-55)
+ t = a[19] ^ d4
+ bc2 = t<<39 | t>>(64-39)
+ a[5] = bc0 ^ (bc2 &^ bc1)
+ a[21] = bc1 ^ (bc3 &^ bc2)
+ a[12] = bc2 ^ (bc4 &^ bc3)
+ a[3] = bc3 ^ (bc0 &^ bc4)
+ a[19] = bc4 ^ (bc1 &^ bc0)
+
+ // Round 3
+ bc0 = a[0] ^ a[5] ^ a[10] ^ a[15] ^ a[20]
+ bc1 = a[1] ^ a[6] ^ a[11] ^ a[16] ^ a[21]
+ bc2 = a[2] ^ a[7] ^ a[12] ^ a[17] ^ a[22]
+ bc3 = a[3] ^ a[8] ^ a[13] ^ a[18] ^ a[23]
+ bc4 = a[4] ^ a[9] ^ a[14] ^ a[19] ^ a[24]
+ d0 = bc4 ^ (bc1<<1 | bc1>>63)
+ d1 = bc0 ^ (bc2<<1 | bc2>>63)
+ d2 = bc1 ^ (bc3<<1 | bc3>>63)
+ d3 = bc2 ^ (bc4<<1 | bc4>>63)
+ d4 = bc3 ^ (bc0<<1 | bc0>>63)
+
+ bc0 = a[0] ^ d0
+ t = a[11] ^ d1
+ bc1 = t<<44 | t>>(64-44)
+ t = a[22] ^ d2
+ bc2 = t<<43 | t>>(64-43)
+ t = a[8] ^ d3
+ bc3 = t<<21 | t>>(64-21)
+ t = a[19] ^ d4
+ bc4 = t<<14 | t>>(64-14)
+ a[0] = bc0 ^ (bc2 &^ bc1) ^ rc[i+2]
+ a[11] = bc1 ^ (bc3 &^ bc2)
+ a[22] = bc2 ^ (bc4 &^ bc3)
+ a[8] = bc3 ^ (bc0 &^ bc4)
+ a[19] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[15] ^ d0
+ bc2 = t<<3 | t>>(64-3)
+ t = a[1] ^ d1
+ bc3 = t<<45 | t>>(64-45)
+ t = a[12] ^ d2
+ bc4 = t<<61 | t>>(64-61)
+ t = a[23] ^ d3
+ bc0 = t<<28 | t>>(64-28)
+ t = a[9] ^ d4
+ bc1 = t<<20 | t>>(64-20)
+ a[15] = bc0 ^ (bc2 &^ bc1)
+ a[1] = bc1 ^ (bc3 &^ bc2)
+ a[12] = bc2 ^ (bc4 &^ bc3)
+ a[23] = bc3 ^ (bc0 &^ bc4)
+ a[9] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[5] ^ d0
+ bc4 = t<<18 | t>>(64-18)
+ t = a[16] ^ d1
+ bc0 = t<<1 | t>>(64-1)
+ t = a[2] ^ d2
+ bc1 = t<<6 | t>>(64-6)
+ t = a[13] ^ d3
+ bc2 = t<<25 | t>>(64-25)
+ t = a[24] ^ d4
+ bc3 = t<<8 | t>>(64-8)
+ a[5] = bc0 ^ (bc2 &^ bc1)
+ a[16] = bc1 ^ (bc3 &^ bc2)
+ a[2] = bc2 ^ (bc4 &^ bc3)
+ a[13] = bc3 ^ (bc0 &^ bc4)
+ a[24] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[20] ^ d0
+ bc1 = t<<36 | t>>(64-36)
+ t = a[6] ^ d1
+ bc2 = t<<10 | t>>(64-10)
+ t = a[17] ^ d2
+ bc3 = t<<15 | t>>(64-15)
+ t = a[3] ^ d3
+ bc4 = t<<56 | t>>(64-56)
+ t = a[14] ^ d4
+ bc0 = t<<27 | t>>(64-27)
+ a[20] = bc0 ^ (bc2 &^ bc1)
+ a[6] = bc1 ^ (bc3 &^ bc2)
+ a[17] = bc2 ^ (bc4 &^ bc3)
+ a[3] = bc3 ^ (bc0 &^ bc4)
+ a[14] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[10] ^ d0
+ bc3 = t<<41 | t>>(64-41)
+ t = a[21] ^ d1
+ bc4 = t<<2 | t>>(64-2)
+ t = a[7] ^ d2
+ bc0 = t<<62 | t>>(64-62)
+ t = a[18] ^ d3
+ bc1 = t<<55 | t>>(64-55)
+ t = a[4] ^ d4
+ bc2 = t<<39 | t>>(64-39)
+ a[10] = bc0 ^ (bc2 &^ bc1)
+ a[21] = bc1 ^ (bc3 &^ bc2)
+ a[7] = bc2 ^ (bc4 &^ bc3)
+ a[18] = bc3 ^ (bc0 &^ bc4)
+ a[4] = bc4 ^ (bc1 &^ bc0)
+
+ // Round 4
+ bc0 = a[0] ^ a[5] ^ a[10] ^ a[15] ^ a[20]
+ bc1 = a[1] ^ a[6] ^ a[11] ^ a[16] ^ a[21]
+ bc2 = a[2] ^ a[7] ^ a[12] ^ a[17] ^ a[22]
+ bc3 = a[3] ^ a[8] ^ a[13] ^ a[18] ^ a[23]
+ bc4 = a[4] ^ a[9] ^ a[14] ^ a[19] ^ a[24]
+ d0 = bc4 ^ (bc1<<1 | bc1>>63)
+ d1 = bc0 ^ (bc2<<1 | bc2>>63)
+ d2 = bc1 ^ (bc3<<1 | bc3>>63)
+ d3 = bc2 ^ (bc4<<1 | bc4>>63)
+ d4 = bc3 ^ (bc0<<1 | bc0>>63)
+
+ bc0 = a[0] ^ d0
+ t = a[1] ^ d1
+ bc1 = t<<44 | t>>(64-44)
+ t = a[2] ^ d2
+ bc2 = t<<43 | t>>(64-43)
+ t = a[3] ^ d3
+ bc3 = t<<21 | t>>(64-21)
+ t = a[4] ^ d4
+ bc4 = t<<14 | t>>(64-14)
+ a[0] = bc0 ^ (bc2 &^ bc1) ^ rc[i+3]
+ a[1] = bc1 ^ (bc3 &^ bc2)
+ a[2] = bc2 ^ (bc4 &^ bc3)
+ a[3] = bc3 ^ (bc0 &^ bc4)
+ a[4] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[5] ^ d0
+ bc2 = t<<3 | t>>(64-3)
+ t = a[6] ^ d1
+ bc3 = t<<45 | t>>(64-45)
+ t = a[7] ^ d2
+ bc4 = t<<61 | t>>(64-61)
+ t = a[8] ^ d3
+ bc0 = t<<28 | t>>(64-28)
+ t = a[9] ^ d4
+ bc1 = t<<20 | t>>(64-20)
+ a[5] = bc0 ^ (bc2 &^ bc1)
+ a[6] = bc1 ^ (bc3 &^ bc2)
+ a[7] = bc2 ^ (bc4 &^ bc3)
+ a[8] = bc3 ^ (bc0 &^ bc4)
+ a[9] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[10] ^ d0
+ bc4 = t<<18 | t>>(64-18)
+ t = a[11] ^ d1
+ bc0 = t<<1 | t>>(64-1)
+ t = a[12] ^ d2
+ bc1 = t<<6 | t>>(64-6)
+ t = a[13] ^ d3
+ bc2 = t<<25 | t>>(64-25)
+ t = a[14] ^ d4
+ bc3 = t<<8 | t>>(64-8)
+ a[10] = bc0 ^ (bc2 &^ bc1)
+ a[11] = bc1 ^ (bc3 &^ bc2)
+ a[12] = bc2 ^ (bc4 &^ bc3)
+ a[13] = bc3 ^ (bc0 &^ bc4)
+ a[14] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[15] ^ d0
+ bc1 = t<<36 | t>>(64-36)
+ t = a[16] ^ d1
+ bc2 = t<<10 | t>>(64-10)
+ t = a[17] ^ d2
+ bc3 = t<<15 | t>>(64-15)
+ t = a[18] ^ d3
+ bc4 = t<<56 | t>>(64-56)
+ t = a[19] ^ d4
+ bc0 = t<<27 | t>>(64-27)
+ a[15] = bc0 ^ (bc2 &^ bc1)
+ a[16] = bc1 ^ (bc3 &^ bc2)
+ a[17] = bc2 ^ (bc4 &^ bc3)
+ a[18] = bc3 ^ (bc0 &^ bc4)
+ a[19] = bc4 ^ (bc1 &^ bc0)
+
+ t = a[20] ^ d0
+ bc3 = t<<41 | t>>(64-41)
+ t = a[21] ^ d1
+ bc4 = t<<2 | t>>(64-2)
+ t = a[22] ^ d2
+ bc0 = t<<62 | t>>(64-62)
+ t = a[23] ^ d3
+ bc1 = t<<55 | t>>(64-55)
+ t = a[24] ^ d4
+ bc2 = t<<39 | t>>(64-39)
+ a[20] = bc0 ^ (bc2 &^ bc1)
+ a[21] = bc1 ^ (bc3 &^ bc2)
+ a[22] = bc2 ^ (bc4 &^ bc3)
+ a[23] = bc3 ^ (bc0 &^ bc4)
+ a[24] = bc4 ^ (bc1 &^ bc0)
+ }
+}
diff --git a/crypto/sha3/register.go b/crypto/sha3/register.go
new file mode 100644
index 000000000..3cf6a22e0
--- /dev/null
+++ b/crypto/sha3/register.go
@@ -0,0 +1,18 @@
+// Copyright 2014 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 go1.4
+
+package sha3
+
+import (
+ "crypto"
+)
+
+func init() {
+ crypto.RegisterHash(crypto.SHA3_224, New224)
+ crypto.RegisterHash(crypto.SHA3_256, New256)
+ crypto.RegisterHash(crypto.SHA3_384, New384)
+ crypto.RegisterHash(crypto.SHA3_512, New512)
+}
diff --git a/crypto/sha3/sha3.go b/crypto/sha3/sha3.go
new file mode 100644
index 000000000..c8fd31cb0
--- /dev/null
+++ b/crypto/sha3/sha3.go
@@ -0,0 +1,193 @@
+// Copyright 2014 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 sha3
+
+// spongeDirection indicates the direction bytes are flowing through the sponge.
+type spongeDirection int
+
+const (
+ // spongeAbsorbing indicates that the sponge is absorbing input.
+ spongeAbsorbing spongeDirection = iota
+ // spongeSqueezing indicates that the sponge is being squeezed.
+ spongeSqueezing
+)
+
+const (
+ // maxRate is the maximum size of the internal buffer. SHAKE-256
+ // currently needs the largest buffer.
+ maxRate = 168
+)
+
+type state struct {
+ // Generic sponge components.
+ a [25]uint64 // main state of the hash
+ buf []byte // points into storage
+ rate int // the number of bytes of state to use
+
+ // dsbyte contains the "domain separation" bits and the first bit of
+ // the padding. Sections 6.1 and 6.2 of [1] separate the outputs of the
+ // SHA-3 and SHAKE functions by appending bitstrings to the message.
+ // Using a little-endian bit-ordering convention, these are "01" for SHA-3
+ // and "1111" for SHAKE, or 00000010b and 00001111b, respectively. Then the
+ // padding rule from section 5.1 is applied to pad the message to a multiple
+ // of the rate, which involves adding a "1" bit, zero or more "0" bits, and
+ // a final "1" bit. We merge the first "1" bit from the padding into dsbyte,
+ // giving 00000110b (0x06) and 00011111b (0x1f).
+ // [1] http://csrc.nist.gov/publications/drafts/fips-202/fips_202_draft.pdf
+ // "Draft FIPS 202: SHA-3 Standard: Permutation-Based Hash and
+ // Extendable-Output Functions (May 2014)"
+ dsbyte byte
+ storage [maxRate]byte
+
+ // Specific to SHA-3 and SHAKE.
+ fixedOutput bool // whether this is a fixed-ouput-length instance
+ outputLen int // the default output size in bytes
+ state spongeDirection // whether the sponge is absorbing or squeezing
+}
+
+// BlockSize returns the rate of sponge underlying this hash function.
+func (d *state) BlockSize() int { return d.rate }
+
+// Size returns the output size of the hash function in bytes.
+func (d *state) Size() int { return d.outputLen }
+
+// Reset clears the internal state by zeroing the sponge state and
+// the byte buffer, and setting Sponge.state to absorbing.
+func (d *state) Reset() {
+ // Zero the permutation's state.
+ for i := range d.a {
+ d.a[i] = 0
+ }
+ d.state = spongeAbsorbing
+ d.buf = d.storage[:0]
+}
+
+func (d *state) clone() *state {
+ ret := *d
+ if ret.state == spongeAbsorbing {
+ ret.buf = ret.storage[:len(ret.buf)]
+ } else {
+ ret.buf = ret.storage[d.rate-cap(d.buf) : d.rate]
+ }
+
+ return &ret
+}
+
+// permute applies the KeccakF-1600 permutation. It handles
+// any input-output buffering.
+func (d *state) permute() {
+ switch d.state {
+ case spongeAbsorbing:
+ // If we're absorbing, we need to xor the input into the state
+ // before applying the permutation.
+ xorIn(d, d.buf)
+ d.buf = d.storage[:0]
+ keccakF1600(&d.a)
+ case spongeSqueezing:
+ // If we're squeezing, we need to apply the permutatin before
+ // copying more output.
+ keccakF1600(&d.a)
+ d.buf = d.storage[:d.rate]
+ copyOut(d, d.buf)
+ }
+}
+
+// pads appends the domain separation bits in dsbyte, applies
+// the multi-bitrate 10..1 padding rule, and permutes the state.
+func (d *state) padAndPermute(dsbyte byte) {
+ if d.buf == nil {
+ d.buf = d.storage[:0]
+ }
+ // Pad with this instance's domain-separator bits. We know that there's
+ // at least one byte of space in d.buf because, if it were full,
+ // permute would have been called to empty it. dsbyte also contains the
+ // first one bit for the padding. See the comment in the state struct.
+ d.buf = append(d.buf, dsbyte)
+ zerosStart := len(d.buf)
+ d.buf = d.storage[:d.rate]
+ for i := zerosStart; i < d.rate; i++ {
+ d.buf[i] = 0
+ }
+ // This adds the final one bit for the padding. Because of the way that
+ // bits are numbered from the LSB upwards, the final bit is the MSB of
+ // the last byte.
+ d.buf[d.rate-1] ^= 0x80
+ // Apply the permutation
+ d.permute()
+ d.state = spongeSqueezing
+ d.buf = d.storage[:d.rate]
+ copyOut(d, d.buf)
+}
+
+// Write absorbs more data into the hash's state. It produces an error
+// if more data is written to the ShakeHash after writing
+func (d *state) Write(p []byte) (written int, err error) {
+ if d.state != spongeAbsorbing {
+ panic("sha3: write to sponge after read")
+ }
+ if d.buf == nil {
+ d.buf = d.storage[:0]
+ }
+ written = len(p)
+
+ for len(p) > 0 {
+ if len(d.buf) == 0 && len(p) >= d.rate {
+ // The fast path; absorb a full "rate" bytes of input and apply the permutation.
+ xorIn(d, p[:d.rate])
+ p = p[d.rate:]
+ keccakF1600(&d.a)
+ } else {
+ // The slow path; buffer the input until we can fill the sponge, and then xor it in.
+ todo := d.rate - len(d.buf)
+ if todo > len(p) {
+ todo = len(p)
+ }
+ d.buf = append(d.buf, p[:todo]...)
+ p = p[todo:]
+
+ // If the sponge is full, apply the permutation.
+ if len(d.buf) == d.rate {
+ d.permute()
+ }
+ }
+ }
+
+ return
+}
+
+// Read squeezes an arbitrary number of bytes from the sponge.
+func (d *state) Read(out []byte) (n int, err error) {
+ // If we're still absorbing, pad and apply the permutation.
+ if d.state == spongeAbsorbing {
+ d.padAndPermute(d.dsbyte)
+ }
+
+ n = len(out)
+
+ // Now, do the squeezing.
+ for len(out) > 0 {
+ n := copy(out, d.buf)
+ d.buf = d.buf[n:]
+ out = out[n:]
+
+ // Apply the permutation if we've squeezed the sponge dry.
+ if len(d.buf) == 0 {
+ d.permute()
+ }
+ }
+
+ return
+}
+
+// Sum applies padding to the hash state and then squeezes out the desired
+// number of output bytes.
+func (d *state) Sum(in []byte) []byte {
+ // Make a copy of the original hash so that caller can keep writing
+ // and summing.
+ dup := d.clone()
+ hash := make([]byte, dup.outputLen)
+ dup.Read(hash)
+ return append(in, hash...)
+}
diff --git a/crypto/sha3/sha3_test.go b/crypto/sha3/sha3_test.go
new file mode 100644
index 000000000..caf72f279
--- /dev/null
+++ b/crypto/sha3/sha3_test.go
@@ -0,0 +1,306 @@
+// Copyright 2014 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 sha3
+
+// Tests include all the ShortMsgKATs provided by the Keccak team at
+// https://github.com/gvanas/KeccakCodePackage
+//
+// They only include the zero-bit case of the bitwise testvectors
+// published by NIST in the draft of FIPS-202.
+
+import (
+ "bytes"
+ "compress/flate"
+ "encoding/hex"
+ "encoding/json"
+ "hash"
+ "os"
+ "strings"
+ "testing"
+)
+
+const (
+ testString = "brekeccakkeccak koax koax"
+ katFilename = "testdata/keccakKats.json.deflate"
+)
+
+// Internal-use instances of SHAKE used to test against KATs.
+func newHashShake128() hash.Hash {
+ return &state{rate: 168, dsbyte: 0x1f, outputLen: 512}
+}
+func newHashShake256() hash.Hash {
+ return &state{rate: 136, dsbyte: 0x1f, outputLen: 512}
+}
+
+// testDigests contains functions returning hash.Hash instances
+// with output-length equal to the KAT length for both SHA-3 and
+// SHAKE instances.
+var testDigests = map[string]func() hash.Hash{
+ "SHA3-224": New224,
+ "SHA3-256": New256,
+ "SHA3-384": New384,
+ "SHA3-512": New512,
+ "SHAKE128": newHashShake128,
+ "SHAKE256": newHashShake256,
+}
+
+// testShakes contains functions that return ShakeHash instances for
+// testing the ShakeHash-specific interface.
+var testShakes = map[string]func() ShakeHash{
+ "SHAKE128": NewShake128,
+ "SHAKE256": NewShake256,
+}
+
+// decodeHex converts a hex-encoded string into a raw byte string.
+func decodeHex(s string) []byte {
+ b, err := hex.DecodeString(s)
+ if err != nil {
+ panic(err)
+ }
+ return b
+}
+
+// structs used to marshal JSON test-cases.
+type KeccakKats struct {
+ Kats map[string][]struct {
+ Digest string `json:"digest"`
+ Length int64 `json:"length"`
+ Message string `json:"message"`
+ }
+}
+
+func testUnalignedAndGeneric(t *testing.T, testf func(impl string)) {
+ xorInOrig, copyOutOrig := xorIn, copyOut
+ xorIn, copyOut = xorInGeneric, copyOutGeneric
+ testf("generic")
+ if xorImplementationUnaligned != "generic" {
+ xorIn, copyOut = xorInUnaligned, copyOutUnaligned
+ testf("unaligned")
+ }
+ xorIn, copyOut = xorInOrig, copyOutOrig
+}
+
+// TestKeccakKats tests the SHA-3 and Shake implementations against all the
+// ShortMsgKATs from https://github.com/gvanas/KeccakCodePackage
+// (The testvectors are stored in keccakKats.json.deflate due to their length.)
+func TestKeccakKats(t *testing.T) {
+ testUnalignedAndGeneric(t, func(impl string) {
+ // Read the KATs.
+ deflated, err := os.Open(katFilename)
+ if err != nil {
+ t.Errorf("error opening %s: %s", katFilename, err)
+ }
+ file := flate.NewReader(deflated)
+ dec := json.NewDecoder(file)
+ var katSet KeccakKats
+ err = dec.Decode(&katSet)
+ if err != nil {
+ t.Errorf("error decoding KATs: %s", err)
+ }
+
+ // Do the KATs.
+ for functionName, kats := range katSet.Kats {
+ d := testDigests[functionName]()
+ for _, kat := range kats {
+ d.Reset()
+ in, err := hex.DecodeString(kat.Message)
+ if err != nil {
+ t.Errorf("error decoding KAT: %s", err)
+ }
+ d.Write(in[:kat.Length/8])
+ got := strings.ToUpper(hex.EncodeToString(d.Sum(nil)))
+ if got != kat.Digest {
+ t.Errorf("function=%s, implementation=%s, length=%d\nmessage:\n %s\ngot:\n %s\nwanted:\n %s",
+ functionName, impl, kat.Length, kat.Message, got, kat.Digest)
+ t.Logf("wanted %+v", kat)
+ t.FailNow()
+ }
+ continue
+ }
+ }
+ })
+}
+
+// TestUnalignedWrite tests that writing data in an arbitrary pattern with
+// small input buffers.
+func testUnalignedWrite(t *testing.T) {
+ testUnalignedAndGeneric(t, func(impl string) {
+ buf := sequentialBytes(0x10000)
+ for alg, df := range testDigests {
+ d := df()
+ d.Reset()
+ d.Write(buf)
+ want := d.Sum(nil)
+ d.Reset()
+ for i := 0; i < len(buf); {
+ // Cycle through offsets which make a 137 byte sequence.
+ // Because 137 is prime this sequence should exercise all corner cases.
+ offsets := [17]int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 1}
+ for _, j := range offsets {
+ if v := len(buf) - i; v < j {
+ j = v
+ }
+ d.Write(buf[i : i+j])
+ i += j
+ }
+ }
+ got := d.Sum(nil)
+ if !bytes.Equal(got, want) {
+ t.Errorf("Unaligned writes, implementation=%s, alg=%s\ngot %q, want %q", impl, alg, got, want)
+ }
+ }
+ })
+}
+
+// TestAppend checks that appending works when reallocation is necessary.
+func TestAppend(t *testing.T) {
+ testUnalignedAndGeneric(t, func(impl string) {
+ d := New224()
+
+ for capacity := 2; capacity <= 66; capacity += 64 {
+ // The first time around the loop, Sum will have to reallocate.
+ // The second time, it will not.
+ buf := make([]byte, 2, capacity)
+ d.Reset()
+ d.Write([]byte{0xcc})
+ buf = d.Sum(buf)
+ expected := "0000DF70ADC49B2E76EEE3A6931B93FA41841C3AF2CDF5B32A18B5478C39"
+ if got := strings.ToUpper(hex.EncodeToString(buf)); got != expected {
+ t.Errorf("got %s, want %s", got, expected)
+ }
+ }
+ })
+}
+
+// TestAppendNoRealloc tests that appending works when no reallocation is necessary.
+func TestAppendNoRealloc(t *testing.T) {
+ testUnalignedAndGeneric(t, func(impl string) {
+ buf := make([]byte, 1, 200)
+ d := New224()
+ d.Write([]byte{0xcc})
+ buf = d.Sum(buf)
+ expected := "00DF70ADC49B2E76EEE3A6931B93FA41841C3AF2CDF5B32A18B5478C39"
+ if got := strings.ToUpper(hex.EncodeToString(buf)); got != expected {
+ t.Errorf("%s: got %s, want %s", impl, got, expected)
+ }
+ })
+}
+
+// TestSqueezing checks that squeezing the full output a single time produces
+// the same output as repeatedly squeezing the instance.
+func TestSqueezing(t *testing.T) {
+ testUnalignedAndGeneric(t, func(impl string) {
+ for functionName, newShakeHash := range testShakes {
+ d0 := newShakeHash()
+ d0.Write([]byte(testString))
+ ref := make([]byte, 32)
+ d0.Read(ref)
+
+ d1 := newShakeHash()
+ d1.Write([]byte(testString))
+ var multiple []byte
+ for _ = range ref {
+ one := make([]byte, 1)
+ d1.Read(one)
+ multiple = append(multiple, one...)
+ }
+ if !bytes.Equal(ref, multiple) {
+ t.Errorf("%s (%s): squeezing %d bytes one at a time failed", functionName, impl, len(ref))
+ }
+ }
+ })
+}
+
+// sequentialBytes produces a buffer of size consecutive bytes 0x00, 0x01, ..., used for testing.
+func sequentialBytes(size int) []byte {
+ result := make([]byte, size)
+ for i := range result {
+ result[i] = byte(i)
+ }
+ return result
+}
+
+// BenchmarkPermutationFunction measures the speed of the permutation function
+// with no input data.
+func BenchmarkPermutationFunction(b *testing.B) {
+ b.SetBytes(int64(200))
+ var lanes [25]uint64
+ for i := 0; i < b.N; i++ {
+ keccakF1600(&lanes)
+ }
+}
+
+// benchmarkHash tests the speed to hash num buffers of buflen each.
+func benchmarkHash(b *testing.B, h hash.Hash, size, num int) {
+ b.StopTimer()
+ h.Reset()
+ data := sequentialBytes(size)
+ b.SetBytes(int64(size * num))
+ b.StartTimer()
+
+ var state []byte
+ for i := 0; i < b.N; i++ {
+ for j := 0; j < num; j++ {
+ h.Write(data)
+ }
+ state = h.Sum(state[:0])
+ }
+ b.StopTimer()
+ h.Reset()
+}
+
+// benchmarkShake is specialized to the Shake instances, which don't
+// require a copy on reading output.
+func benchmarkShake(b *testing.B, h ShakeHash, size, num int) {
+ b.StopTimer()
+ h.Reset()
+ data := sequentialBytes(size)
+ d := make([]byte, 32)
+
+ b.SetBytes(int64(size * num))
+ b.StartTimer()
+
+ for i := 0; i < b.N; i++ {
+ h.Reset()
+ for j := 0; j < num; j++ {
+ h.Write(data)
+ }
+ h.Read(d)
+ }
+}
+
+func BenchmarkSha3_512_MTU(b *testing.B) { benchmarkHash(b, New512(), 1350, 1) }
+func BenchmarkSha3_384_MTU(b *testing.B) { benchmarkHash(b, New384(), 1350, 1) }
+func BenchmarkSha3_256_MTU(b *testing.B) { benchmarkHash(b, New256(), 1350, 1) }
+func BenchmarkSha3_224_MTU(b *testing.B) { benchmarkHash(b, New224(), 1350, 1) }
+
+func BenchmarkShake128_MTU(b *testing.B) { benchmarkShake(b, NewShake128(), 1350, 1) }
+func BenchmarkShake256_MTU(b *testing.B) { benchmarkShake(b, NewShake256(), 1350, 1) }
+func BenchmarkShake256_16x(b *testing.B) { benchmarkShake(b, NewShake256(), 16, 1024) }
+func BenchmarkShake256_1MiB(b *testing.B) { benchmarkShake(b, NewShake256(), 1024, 1024) }
+
+func BenchmarkSha3_512_1MiB(b *testing.B) { benchmarkHash(b, New512(), 1024, 1024) }
+
+func Example_sum() {
+ buf := []byte("some data to hash")
+ // A hash needs to be 64 bytes long to have 256-bit collision resistance.
+ h := make([]byte, 64)
+ // Compute a 64-byte hash of buf and put it in h.
+ ShakeSum256(h, buf)
+}
+
+func Example_mac() {
+ k := []byte("this is a secret key; you should generate a strong random key that's at least 32 bytes long")
+ buf := []byte("and this is some data to authenticate")
+ // A MAC with 32 bytes of output has 256-bit security strength -- if you use at least a 32-byte-long key.
+ h := make([]byte, 32)
+ d := NewShake256()
+ // Write the key into the hash.
+ d.Write(k)
+ // Now write the data.
+ d.Write(buf)
+ // Read 32 bytes of output from the hash into h.
+ d.Read(h)
+}
diff --git a/crypto/sha3/shake.go b/crypto/sha3/shake.go
new file mode 100644
index 000000000..841f9860f
--- /dev/null
+++ b/crypto/sha3/shake.go
@@ -0,0 +1,60 @@
+// Copyright 2014 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 sha3
+
+// This file defines the ShakeHash interface, and provides
+// functions for creating SHAKE instances, as well as utility
+// functions for hashing bytes to arbitrary-length output.
+
+import (
+ "io"
+)
+
+// ShakeHash defines the interface to hash functions that
+// support arbitrary-length output.
+type ShakeHash interface {
+ // Write absorbs more data into the hash's state. It panics if input is
+ // written to it after output has been read from it.
+ io.Writer
+
+ // Read reads more output from the hash; reading affects the hash's
+ // state. (ShakeHash.Read is thus very different from Hash.Sum)
+ // It never returns an error.
+ io.Reader
+
+ // Clone returns a copy of the ShakeHash in its current state.
+ Clone() ShakeHash
+
+ // Reset resets the ShakeHash to its initial state.
+ Reset()
+}
+
+func (d *state) Clone() ShakeHash {
+ return d.clone()
+}
+
+// NewShake128 creates a new SHAKE128 variable-output-length ShakeHash.
+// Its generic security strength is 128 bits against all attacks if at
+// least 32 bytes of its output are used.
+func NewShake128() ShakeHash { return &state{rate: 168, dsbyte: 0x1f} }
+
+// NewShake256 creates a new SHAKE128 variable-output-length ShakeHash.
+// Its generic security strength is 256 bits against all attacks if
+// at least 64 bytes of its output are used.
+func NewShake256() ShakeHash { return &state{rate: 136, dsbyte: 0x1f} }
+
+// ShakeSum128 writes an arbitrary-length digest of data into hash.
+func ShakeSum128(hash, data []byte) {
+ h := NewShake128()
+ h.Write(data)
+ h.Read(hash)
+}
+
+// ShakeSum256 writes an arbitrary-length digest of data into hash.
+func ShakeSum256(hash, data []byte) {
+ h := NewShake256()
+ h.Write(data)
+ h.Read(hash)
+}
diff --git a/crypto/sha3/testdata/keccakKats.json.deflate b/crypto/sha3/testdata/keccakKats.json.deflate
new file mode 100644
index 000000000..62e85ae24
--- /dev/null
+++ b/crypto/sha3/testdata/keccakKats.json.deflate
Binary files differ
diff --git a/crypto/sha3/xor.go b/crypto/sha3/xor.go
new file mode 100644
index 000000000..d622979c1
--- /dev/null
+++ b/crypto/sha3/xor.go
@@ -0,0 +1,16 @@
+// Copyright 2015 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,!386 appengine
+
+package sha3
+
+var (
+ xorIn = xorInGeneric
+ copyOut = copyOutGeneric
+ xorInUnaligned = xorInGeneric
+ copyOutUnaligned = copyOutGeneric
+)
+
+const xorImplementationUnaligned = "generic"
diff --git a/crypto/sha3/xor_generic.go b/crypto/sha3/xor_generic.go
new file mode 100644
index 000000000..fd35f02ef
--- /dev/null
+++ b/crypto/sha3/xor_generic.go
@@ -0,0 +1,28 @@
+// Copyright 2015 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 sha3
+
+import "encoding/binary"
+
+// xorInGeneric xors the bytes in buf into the state; it
+// makes no non-portable assumptions about memory layout
+// or alignment.
+func xorInGeneric(d *state, buf []byte) {
+ n := len(buf) / 8
+
+ for i := 0; i < n; i++ {
+ a := binary.LittleEndian.Uint64(buf)
+ d.a[i] ^= a
+ buf = buf[8:]
+ }
+}
+
+// copyOutGeneric copies ulint64s to a byte buffer.
+func copyOutGeneric(d *state, b []byte) {
+ for i := 0; len(b) >= 8; i++ {
+ binary.LittleEndian.PutUint64(b, d.a[i])
+ b = b[8:]
+ }
+}
diff --git a/crypto/sha3/xor_unaligned.go b/crypto/sha3/xor_unaligned.go
new file mode 100644
index 000000000..c7851a1d8
--- /dev/null
+++ b/crypto/sha3/xor_unaligned.go
@@ -0,0 +1,58 @@
+// Copyright 2015 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 386
+// +build !appengine
+
+package sha3
+
+import "unsafe"
+
+func xorInUnaligned(d *state, buf []byte) {
+ bw := (*[maxRate / 8]uint64)(unsafe.Pointer(&buf[0]))
+ n := len(buf)
+ if n >= 72 {
+ d.a[0] ^= bw[0]
+ d.a[1] ^= bw[1]
+ d.a[2] ^= bw[2]
+ d.a[3] ^= bw[3]
+ d.a[4] ^= bw[4]
+ d.a[5] ^= bw[5]
+ d.a[6] ^= bw[6]
+ d.a[7] ^= bw[7]
+ d.a[8] ^= bw[8]
+ }
+ if n >= 104 {
+ d.a[9] ^= bw[9]
+ d.a[10] ^= bw[10]
+ d.a[11] ^= bw[11]
+ d.a[12] ^= bw[12]
+ }
+ if n >= 136 {
+ d.a[13] ^= bw[13]
+ d.a[14] ^= bw[14]
+ d.a[15] ^= bw[15]
+ d.a[16] ^= bw[16]
+ }
+ if n >= 144 {
+ d.a[17] ^= bw[17]
+ }
+ if n >= 168 {
+ d.a[18] ^= bw[18]
+ d.a[19] ^= bw[19]
+ d.a[20] ^= bw[20]
+ }
+}
+
+func copyOutUnaligned(d *state, buf []byte) {
+ ab := (*[maxRate]uint8)(unsafe.Pointer(&d.a[0]))
+ copy(buf, ab[:])
+}
+
+var (
+ xorIn = xorInUnaligned
+ copyOut = copyOutUnaligned
+)
+
+const xorImplementationUnaligned = "unaligned"
generated by cgit (git 2.34.1) at 2024-12-24 23:54:14 +0800