| // 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" |
| "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 = appendUint64(b, d.h[0]) |
| b = appendUint64(b, d.h[1]) |
| b = appendUint64(b, d.h[2]) |
| b = appendUint64(b, d.h[3]) |
| b = appendUint64(b, d.h[4]) |
| b = appendUint64(b, d.h[5]) |
| b = appendUint64(b, d.h[6]) |
| b = appendUint64(b, d.h[7]) |
| b = append(b, d.x[:d.nx]...) |
| b = b[:len(b)+len(d.x)-int(d.nx)] // already zero |
| b = 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 putUint64(x []byte, s uint64) { |
| _ = x[7] |
| x[0] = byte(s >> 56) |
| x[1] = byte(s >> 48) |
| x[2] = byte(s >> 40) |
| x[3] = byte(s >> 32) |
| x[4] = byte(s >> 24) |
| x[5] = byte(s >> 16) |
| x[6] = byte(s >> 8) |
| x[7] = byte(s) |
| } |
| |
| func appendUint64(b []byte, x uint64) []byte { |
| var a [8]byte |
| putUint64(a[:], x) |
| return append(b, a[:]...) |
| } |
| |
| 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 { |
| 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 { |
| 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) { |
| 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 { |
| // 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]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 |
| putUint64(tmp[0:], 0) // upper 64 bits are always zero, because len variable has type uint64 |
| putUint64(tmp[8:], len) |
| d.Write(tmp[0:16]) |
| |
| if d.nx != 0 { |
| panic("d.nx != 0") |
| } |
| |
| var digest [Size]byte |
| putUint64(digest[0:], d.h[0]) |
| putUint64(digest[8:], d.h[1]) |
| putUint64(digest[16:], d.h[2]) |
| putUint64(digest[24:], d.h[3]) |
| putUint64(digest[32:], d.h[4]) |
| putUint64(digest[40:], d.h[5]) |
| if d.function != crypto.SHA384 { |
| putUint64(digest[48:], d.h[6]) |
| putUint64(digest[56:], d.h[7]) |
| } |
| |
| return digest |
| } |
| |
| // Sum512 returns the SHA512 checksum of the data. |
| func Sum512(data []byte) [Size]byte { |
| 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) (sum384 [Size384]byte) { |
| d := digest{function: crypto.SHA384} |
| d.Reset() |
| d.Write(data) |
| sum := d.checkSum() |
| copy(sum384[:], sum[:Size384]) |
| return |
| } |
| |
| // Sum512_224 returns the Sum512/224 checksum of the data. |
| func Sum512_224(data []byte) (sum224 [Size224]byte) { |
| d := digest{function: crypto.SHA512_224} |
| d.Reset() |
| d.Write(data) |
| sum := d.checkSum() |
| copy(sum224[:], sum[:Size224]) |
| return |
| } |
| |
| // Sum512_256 returns the Sum512/256 checksum of the data. |
| func Sum512_256(data []byte) (sum256 [Size256]byte) { |
| d := digest{function: crypto.SHA512_256} |
| d.Reset() |
| d.Write(data) |
| sum := d.checkSum() |
| copy(sum256[:], sum[:Size256]) |
| return |
| } |
