diff options
Diffstat (limited to 'src/pkg/crypto/sha256/sha256.go')
| -rw-r--r-- | src/pkg/crypto/sha256/sha256.go | 83 |
1 files changed, 43 insertions, 40 deletions
diff --git a/src/pkg/crypto/sha256/sha256.go b/src/pkg/crypto/sha256/sha256.go index a61e30b42..dc0e18f50 100644 --- a/src/pkg/crypto/sha256/sha256.go +++ b/src/pkg/crypto/sha256/sha256.go @@ -26,29 +26,29 @@ const Size224 = 28 const BlockSize = 64 const ( - _Chunk = 64 - _Init0 = 0x6A09E667 - _Init1 = 0xBB67AE85 - _Init2 = 0x3C6EF372 - _Init3 = 0xA54FF53A - _Init4 = 0x510E527F - _Init5 = 0x9B05688C - _Init6 = 0x1F83D9AB - _Init7 = 0x5BE0CD19 - _Init0_224 = 0xC1059ED8 - _Init1_224 = 0x367CD507 - _Init2_224 = 0x3070DD17 - _Init3_224 = 0xF70E5939 - _Init4_224 = 0xFFC00B31 - _Init5_224 = 0x68581511 - _Init6_224 = 0x64F98FA7 - _Init7_224 = 0xBEFA4FA4 + chunk = 64 + init0 = 0x6A09E667 + init1 = 0xBB67AE85 + init2 = 0x3C6EF372 + init3 = 0xA54FF53A + init4 = 0x510E527F + init5 = 0x9B05688C + init6 = 0x1F83D9AB + init7 = 0x5BE0CD19 + init0_224 = 0xC1059ED8 + init1_224 = 0x367CD507 + init2_224 = 0x3070DD17 + init3_224 = 0xF70E5939 + init4_224 = 0xFFC00B31 + init5_224 = 0x68581511 + init6_224 = 0x64F98FA7 + init7_224 = 0xBEFA4FA4 ) // digest represents the partial evaluation of a checksum. type digest struct { h [8]uint32 - x [_Chunk]byte + x [chunk]byte nx int len uint64 is224 bool // mark if this digest is SHA-224 @@ -56,23 +56,23 @@ type digest struct { func (d *digest) Reset() { if !d.is224 { - 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.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_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 + 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 } d.nx = 0 d.len = 0 @@ -107,21 +107,24 @@ func (d *digest) Write(p []byte) (nn int, err error) { d.len += uint64(nn) if d.nx > 0 { n := len(p) - if n > _Chunk-d.nx { - n = _Chunk - d.nx + if n > chunk-d.nx { + n = chunk - d.nx } for i := 0; i < n; i++ { d.x[d.nx+i] = p[i] } d.nx += n - if d.nx == _Chunk { - _Block(d, d.x[0:]) + if d.nx == chunk { + block(d, d.x[0:]) d.nx = 0 } p = p[n:] } - n := _Block(d, p) - 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) } |