mirror of
https://github.com/Luzifer/cloudkeys-go.git
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Knut Ahlers
a1df72edc5
commitf0db1ff1f8Author: Knut Ahlers <knut@ahlers.me> Date: Sun Dec 24 12:19:56 2017 +0100 Mark option as deprecated Signed-off-by: Knut Ahlers <knut@ahlers.me> commit9891df2a16Author: Knut Ahlers <knut@ahlers.me> Date: Sun Dec 24 12:11:56 2017 +0100 Fix: Typo Signed-off-by: Knut Ahlers <knut@ahlers.me> commit836006de64Author: Knut Ahlers <knut@ahlers.me> Date: Sun Dec 24 12:04:20 2017 +0100 Add new dependencies Signed-off-by: Knut Ahlers <knut@ahlers.me> commitd64fee60c8Author: Knut Ahlers <knut@ahlers.me> Date: Sun Dec 24 11:55:52 2017 +0100 Replace insecure password hashing Prior this commit passwords were hashed with a static salt and using the SHA1 hashing function. This could lead to passwords being attackable in case someone gets access to the raw data stored inside the database. This commit introduces password hashing using bcrypt hashing function which addresses this issue. Old passwords are not automatically re-hashed as they are unknown. Replacing the old password scheme is not that easy and needs #10 to be solved. Therefore the old hashing scheme is kept for compatibility reason. Signed-off-by: Knut Ahlers <knut@ahlers.me> Signed-off-by: Knut Ahlers <knut@ahlers.me> closes #14 closes #15
108 lines
3 KiB
Go
108 lines
3 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package tea implements the TEA algorithm, as defined in Needham and
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// Wheeler's 1994 technical report, “TEA, a Tiny Encryption Algorithm”. See
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// http://www.cix.co.uk/~klockstone/tea.pdf for details.
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package tea
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import (
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"crypto/cipher"
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"encoding/binary"
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"errors"
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)
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const (
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// BlockSize is the size of a TEA block, in bytes.
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BlockSize = 8
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// KeySize is the size of a TEA key, in bytes.
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KeySize = 16
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// delta is the TEA key schedule constant.
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delta = 0x9e3779b9
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// numRounds is the standard number of rounds in TEA.
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numRounds = 64
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)
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// tea is an instance of the TEA cipher with a particular key.
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type tea struct {
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key [16]byte
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rounds int
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}
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// NewCipher returns an instance of the TEA cipher with the standard number of
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// rounds. The key argument must be 16 bytes long.
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func NewCipher(key []byte) (cipher.Block, error) {
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return NewCipherWithRounds(key, numRounds)
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}
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// NewCipherWithRounds returns an instance of the TEA cipher with a given
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// number of rounds, which must be even. The key argument must be 16 bytes
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// long.
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func NewCipherWithRounds(key []byte, rounds int) (cipher.Block, error) {
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if len(key) != 16 {
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return nil, errors.New("tea: incorrect key size")
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}
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if rounds&1 != 0 {
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return nil, errors.New("tea: odd number of rounds specified")
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}
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c := &tea{
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rounds: rounds,
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}
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copy(c.key[:], key)
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return c, nil
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}
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// BlockSize returns the TEA block size, which is eight bytes. It is necessary
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// to satisfy the Block interface in the package "crypto/cipher".
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func (*tea) BlockSize() int {
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return BlockSize
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}
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// Encrypt encrypts the 8 byte buffer src using the key in t and stores the
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// result in dst. Note that for amounts of data larger than a block, it is not
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// safe to just call Encrypt on successive blocks; instead, use an encryption
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// mode like CBC (see crypto/cipher/cbc.go).
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func (t *tea) Encrypt(dst, src []byte) {
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e := binary.BigEndian
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v0, v1 := e.Uint32(src), e.Uint32(src[4:])
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k0, k1, k2, k3 := e.Uint32(t.key[0:]), e.Uint32(t.key[4:]), e.Uint32(t.key[8:]), e.Uint32(t.key[12:])
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sum := uint32(0)
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delta := uint32(delta)
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for i := 0; i < t.rounds/2; i++ {
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sum += delta
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v0 += ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1)
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v1 += ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3)
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}
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e.PutUint32(dst, v0)
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e.PutUint32(dst[4:], v1)
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}
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// Decrypt decrypts the 8 byte buffer src using the key in t and stores the
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// result in dst.
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func (t *tea) Decrypt(dst, src []byte) {
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e := binary.BigEndian
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v0, v1 := e.Uint32(src), e.Uint32(src[4:])
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k0, k1, k2, k3 := e.Uint32(t.key[0:]), e.Uint32(t.key[4:]), e.Uint32(t.key[8:]), e.Uint32(t.key[12:])
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delta := uint32(delta)
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sum := delta * uint32(t.rounds/2) // in general, sum = delta * n
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for i := 0; i < t.rounds/2; i++ {
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v1 -= ((v0 << 4) + k2) ^ (v0 + sum) ^ ((v0 >> 5) + k3)
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v0 -= ((v1 << 4) + k0) ^ (v1 + sum) ^ ((v1 >> 5) + k1)
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sum -= delta
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}
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e.PutUint32(dst, v0)
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e.PutUint32(dst[4:], v1)
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}
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