// 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 SHA-384, SHA-512, SHA-512/224, and SHA-512/256 // hash algorithms as defined in FIPS 180-4. // // All the hash.Hash implementations returned by this package also // implement encoding.BinaryMarshaler and encoding.BinaryUnmarshaler to // marshal and unmarshal the internal state of the hash. package sha512 import ( "crypto" "crypto/internal/boring" "encoding/binary" "errors" "hash" ) func init() { crypto.RegisterHash(crypto.SHA384, New384) crypto.RegisterHash(crypto.SHA512, New) crypto.RegisterHash(crypto.SHA512_224, New512_224) crypto.RegisterHash(crypto.SHA512_256, New512_256) } const ( // Size is the size, in bytes, of a SHA-512 checksum. Size = 64 // Size224 is the size, in bytes, of a SHA-512/224 checksum. Size224 = 28 // Size256 is the size, in bytes, of a SHA-512/256 checksum. Size256 = 32 // Size384 is the size, in bytes, of a SHA-384 checksum. Size384 = 48 // BlockSize is the block size, in bytes, of the SHA-512/224, // SHA-512/256, SHA-384 and SHA-512 hash functions. BlockSize = 128 ) const ( chunk = 128 init0 = 0x6a09e667f3bcc908 init1 = 0xbb67ae8584caa73b init2 = 0x3c6ef372fe94f82b init3 = 0xa54ff53a5f1d36f1 init4 = 0x510e527fade682d1 init5 = 0x9b05688c2b3e6c1f init6 = 0x1f83d9abfb41bd6b init7 = 0x5be0cd19137e2179 init0_224 = 0x8c3d37c819544da2 init1_224 = 0x73e1996689dcd4d6 init2_224 = 0x1dfab7ae32ff9c82 init3_224 = 0x679dd514582f9fcf init4_224 = 0x0f6d2b697bd44da8 init5_224 = 0x77e36f7304c48942 init6_224 = 0x3f9d85a86a1d36c8 init7_224 = 0x1112e6ad91d692a1 init0_256 = 0x22312194fc2bf72c init1_256 = 0x9f555fa3c84c64c2 init2_256 = 0x2393b86b6f53b151 init3_256 = 0x963877195940eabd init4_256 = 0x96283ee2a88effe3 init5_256 = 0xbe5e1e2553863992 init6_256 = 0x2b0199fc2c85b8aa init7_256 = 0x0eb72ddc81c52ca2 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 function crypto.Hash } func (d *digest) Reset() { switch d.function { case crypto.SHA384: 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 case crypto.SHA512_224: d.h[0] = init0_224 d.h[1] = init1_224 d.h[2] = init2_224 d.h[3] = init3_224 d.h[4] = init4_224 d.h[5] = init5_224 d.h[6] = init6_224 d.h[7] = init7_224 case crypto.SHA512_256: d.h[0] = init0_256 d.h[1] = init1_256 d.h[2] = init2_256 d.h[3] = init3_256 d.h[4] = init4_256 d.h[5] = init5_256 d.h[6] = init6_256 d.h[7] = init7_256 default: 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 } d.nx = 0 d.len = 0 } const ( magic384 = "sha\x04" magic512_224 = "sha\x05" magic512_256 = "sha\x06" magic512 = "sha\x07" marshaledSize = len(magic512) + 8*8 + chunk + 8 ) func (d *digest) MarshalBinary() ([]byte, error) { b := make([]byte, 0, marshaledSize) switch d.function { case crypto.SHA384: b = append(b, magic384...) case crypto.SHA512_224: b = append(b, magic512_224...) case crypto.SHA512_256: b = append(b, magic512_256...) case crypto.SHA512: b = append(b, magic512...) default: return nil, errors.New("crypto/sha512: invalid hash function") } b = binary.BigEndian.AppendUint64(b, d.h[0]) b = binary.BigEndian.AppendUint64(b, d.h[1]) b = binary.BigEndian.AppendUint64(b, d.h[2]) b = binary.BigEndian.AppendUint64(b, d.h[3]) b = binary.BigEndian.AppendUint64(b, d.h[4]) b = binary.BigEndian.AppendUint64(b, d.h[5]) b = binary.BigEndian.AppendUint64(b, d.h[6]) b = binary.BigEndian.AppendUint64(b, d.h[7]) b = append(b, d.x[:d.nx]...) b = b[:len(b)+len(d.x)-d.nx] // already zero b = binary.BigEndian.AppendUint64(b, d.len) return b, nil } func (d *digest) UnmarshalBinary(b []byte) error { if len(b) < len(magic512) { return errors.New("crypto/sha512: invalid hash state identifier") } switch { case d.function == crypto.SHA384 && string(b[:len(magic384)]) == magic384: case d.function == crypto.SHA512_224 && string(b[:len(magic512_224)]) == magic512_224: case d.function == crypto.SHA512_256 && string(b[:len(magic512_256)]) == magic512_256: case d.function == crypto.SHA512 && string(b[:len(magic512)]) == magic512: default: return errors.New("crypto/sha512: invalid hash state identifier") } if len(b) != marshaledSize { return errors.New("crypto/sha512: invalid hash state size") } b = b[len(magic512):] b, d.h[0] = consumeUint64(b) b, d.h[1] = consumeUint64(b) b, d.h[2] = consumeUint64(b) b, d.h[3] = consumeUint64(b) b, d.h[4] = consumeUint64(b) b, d.h[5] = consumeUint64(b) b, d.h[6] = consumeUint64(b) b, d.h[7] = consumeUint64(b) b = b[copy(d.x[:], b):] b, d.len = consumeUint64(b) d.nx = int(d.len % chunk) return nil } func consumeUint64(b []byte) ([]byte, uint64) { _ = b[7] x := uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 | uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56 return b[8:], x } // New returns a new hash.Hash computing the SHA-512 checksum. func New() hash.Hash { if boring.Enabled { return boring.NewSHA512() } d := &digest{function: crypto.SHA512} d.Reset() return d } // New512_224 returns a new hash.Hash computing the SHA-512/224 checksum. func New512_224() hash.Hash { d := &digest{function: crypto.SHA512_224} d.Reset() return d } // New512_256 returns a new hash.Hash computing the SHA-512/256 checksum. func New512_256() hash.Hash { d := &digest{function: crypto.SHA512_256} d.Reset() return d } // New384 returns a new hash.Hash computing the SHA-384 checksum. func New384() hash.Hash { if boring.Enabled { return boring.NewSHA384() } d := &digest{function: crypto.SHA384} d.Reset() return d } func (d *digest) Size() int { switch d.function { case crypto.SHA512_224: return Size224 case crypto.SHA512_256: return Size256 case crypto.SHA384: return Size384 default: return Size } } func (d *digest) BlockSize() int { return BlockSize } func (d *digest) Write(p []byte) (nn int, err error) { if d.function != crypto.SHA512_224 && d.function != crypto.SHA512_256 { boring.Unreachable() } 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 (d *digest) Sum(in []byte) []byte { if d.function != crypto.SHA512_224 && d.function != crypto.SHA512_256 { boring.Unreachable() } // Make a copy of d so that caller can keep writing and summing. d0 := new(digest) *d0 = *d hash := d0.checkSum() switch d0.function { case crypto.SHA384: return append(in, hash[:Size384]...) case crypto.SHA512_224: return append(in, hash[:Size224]...) case crypto.SHA512_256: return append(in, hash[:Size256]...) default: 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 + 16]byte // padding + length buffer tmp[0] = 0x80 var t uint64 if len%128 < 112 { t = 112 - len%128 } else { t = 128 + 112 - len%128 } // Length in bits. len <<= 3 padlen := tmp[:t+16] // Upper 64 bits are always zero, because len variable has type uint64, // and tmp is already zeroed at that index, so we can skip updating it. // binary.BigEndian.PutUint64(padlen[t+0:], 0) binary.BigEndian.PutUint64(padlen[t+8:], len) d.Write(padlen) if d.nx != 0 { panic("d.nx != 0") } var digest [Size]byte binary.BigEndian.PutUint64(digest[0:], d.h[0]) binary.BigEndian.PutUint64(digest[8:], d.h[1]) binary.BigEndian.PutUint64(digest[16:], d.h[2]) binary.BigEndian.PutUint64(digest[24:], d.h[3]) binary.BigEndian.PutUint64(digest[32:], d.h[4]) binary.BigEndian.PutUint64(digest[40:], d.h[5]) if d.function != crypto.SHA384 { binary.BigEndian.PutUint64(digest[48:], d.h[6]) binary.BigEndian.PutUint64(digest[56:], d.h[7]) } return digest } // Sum512 returns the SHA512 checksum of the data. func Sum512(data []byte) [Size]byte { if boring.Enabled { return boring.SHA512(data) } d := digest{function: crypto.SHA512} d.Reset() d.Write(data) return d.checkSum() } // Sum384 returns the SHA384 checksum of the data. func Sum384(data []byte) [Size384]byte { if boring.Enabled { return boring.SHA384(data) } d := digest{function: crypto.SHA384} d.Reset() d.Write(data) sum := d.checkSum() ap := (*[Size384]byte)(sum[:]) return *ap } // Sum512_224 returns the Sum512/224 checksum of the data. func Sum512_224(data []byte) [Size224]byte { d := digest{function: crypto.SHA512_224} d.Reset() d.Write(data) sum := d.checkSum() ap := (*[Size224]byte)(sum[:]) return *ap } // Sum512_256 returns the Sum512/256 checksum of the data. func Sum512_256(data []byte) [Size256]byte { d := digest{function: crypto.SHA512_256} d.Reset() d.Write(data) sum := d.checkSum() ap := (*[Size256]byte)(sum[:]) return *ap }