1 files changed, 0 insertions, 149 deletions
diff --git a/common/drbg/hash_drbg.go b/common/drbg/hash_drbg.go
deleted file mode 100644
index cc4e8b9..0000000
--- a/common/drbg/hash_drbg.go
+++ /dev/null
@@ -1,149 +0,0 @@
-/*
- * Copyright (c) 2014, Yawning Angel <yawning at torproject dot org>
- * 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.
- *
- * 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 HOLDER 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.
- */
-
-// Package drbg implements a minimalistic DRBG based off SipHash-2-4 in OFB
-// mode.
-package drbg
-
-import (
-	"encoding/binary"
-	"encoding/hex"
-	"fmt"
-	"hash"
-
-	"github.com/dchest/siphash"
-
-	"github.com/OperatorFoundation/obfs4/common/csrand"
-)
-
-// Size is the length of the HashDrbg output.
-const Size = siphash.Size
-
-// SeedLength is the length of the HashDrbg seed.
-const SeedLength = 16 + Size
-
-// Seed is the initial state for a HashDrbg.  It consists of a SipHash-2-4
-// key, and 8 bytes of initial data.
-type Seed [SeedLength]byte
-
-// Bytes returns a pointer to the raw HashDrbg seed.
-func (seed *Seed) Bytes() *[SeedLength]byte {
-	return (*[SeedLength]byte)(seed)
-}
-
-// Hex returns the hexdecimal representation of the seed.
-func (seed *Seed) Hex() string {
-	return hex.EncodeToString(seed.Bytes()[:])
-}
-
-// NewSeed returns a Seed initialized with the runtime CSPRNG.
-func NewSeed() (seed *Seed, err error) {
-	seed = new(Seed)
-	if err = csrand.Bytes(seed.Bytes()[:]); err != nil {
-		return nil, err
-	}
-
-	return
-}
-
-// SeedFromBytes creates a Seed from the raw bytes, truncating to SeedLength as
-// appropriate.
-func SeedFromBytes(src []byte) (seed *Seed, err error) {
-	if len(src) < SeedLength {
-		return nil, InvalidSeedLengthError(len(src))
-	}
-
-	seed = new(Seed)
-	copy(seed.Bytes()[:], src)
-
-	return
-}
-
-// SeedFromHex creates a Seed from the hexdecimal representation, truncating to
-// SeedLength as appropriate.
-func SeedFromHex(encoded string) (seed *Seed, err error) {
-	var raw []byte
-	if raw, err = hex.DecodeString(encoded); err != nil {
-		return nil, err
-	}
-
-	return SeedFromBytes(raw)
-}
-
-// InvalidSeedLengthError is the error returned when the seed provided to the
-// DRBG is an invalid length.
-type InvalidSeedLengthError int
-
-func (e InvalidSeedLengthError) Error() string {
-	return fmt.Sprintf("invalid seed length: %d", int(e))
-}
-
-// HashDrbg is a CSDRBG based off of SipHash-2-4 in OFB mode.
-type HashDrbg struct {
-	sip hash.Hash64
-	ofb [Size]byte
-}
-
-// NewHashDrbg makes a HashDrbg instance based off an optional seed.  The seed
-// is truncated to SeedLength.
-func NewHashDrbg(seed *Seed) (*HashDrbg, error) {
-	drbg := new(HashDrbg)
-	if seed == nil {
-		var err error
-		if seed, err = NewSeed(); err != nil {
-			return nil, err
-		}
-	}
-	drbg.sip = siphash.New(seed.Bytes()[:16])
-	copy(drbg.ofb[:], seed.Bytes()[16:])
-
-	return drbg, nil
-}
-
-// Int63 returns a uniformly distributed random integer [0, 1 << 63).
-func (drbg *HashDrbg) Int63() int64 {
-	block := drbg.NextBlock()
-	ret := binary.BigEndian.Uint64(block)
-	ret &= (1<<63 - 1)
-
-	return int64(ret)
-}
-
-// Seed does nothing, call NewHashDrbg if you want to reseed.
-func (drbg *HashDrbg) Seed(seed int64) {
-	// No-op.
-}
-
-// NextBlock returns the next 8 byte DRBG block.
-func (drbg *HashDrbg) NextBlock() []byte {
-	drbg.sip.Write(drbg.ofb[:])
-	copy(drbg.ofb[:], drbg.sip.Sum(nil))
-
-	ret := make([]byte, Size)
-	copy(ret, drbg.ofb[:])
-	return ret
-}