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
159 lines
6 KiB
Go
159 lines
6 KiB
Go
// Copyright 2010 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 blowfish
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// getNextWord returns the next big-endian uint32 value from the byte slice
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// at the given position in a circular manner, updating the position.
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func getNextWord(b []byte, pos *int) uint32 {
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var w uint32
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j := *pos
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for i := 0; i < 4; i++ {
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w = w<<8 | uint32(b[j])
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j++
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if j >= len(b) {
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j = 0
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}
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}
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*pos = j
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return w
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}
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// ExpandKey performs a key expansion on the given *Cipher. Specifically, it
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// performs the Blowfish algorithm's key schedule which sets up the *Cipher's
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// pi and substitution tables for calls to Encrypt. This is used, primarily,
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// by the bcrypt package to reuse the Blowfish key schedule during its
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// set up. It's unlikely that you need to use this directly.
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func ExpandKey(key []byte, c *Cipher) {
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j := 0
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for i := 0; i < 18; i++ {
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// Using inlined getNextWord for performance.
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var d uint32
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for k := 0; k < 4; k++ {
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d = d<<8 | uint32(key[j])
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j++
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if j >= len(key) {
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j = 0
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}
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}
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c.p[i] ^= d
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}
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var l, r uint32
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for i := 0; i < 18; i += 2 {
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l, r = encryptBlock(l, r, c)
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c.p[i], c.p[i+1] = l, r
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}
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for i := 0; i < 256; i += 2 {
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l, r = encryptBlock(l, r, c)
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c.s0[i], c.s0[i+1] = l, r
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}
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for i := 0; i < 256; i += 2 {
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l, r = encryptBlock(l, r, c)
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c.s1[i], c.s1[i+1] = l, r
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}
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for i := 0; i < 256; i += 2 {
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l, r = encryptBlock(l, r, c)
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c.s2[i], c.s2[i+1] = l, r
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}
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for i := 0; i < 256; i += 2 {
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l, r = encryptBlock(l, r, c)
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c.s3[i], c.s3[i+1] = l, r
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}
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}
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// This is similar to ExpandKey, but folds the salt during the key
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// schedule. While ExpandKey is essentially expandKeyWithSalt with an all-zero
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// salt passed in, reusing ExpandKey turns out to be a place of inefficiency
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// and specializing it here is useful.
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func expandKeyWithSalt(key []byte, salt []byte, c *Cipher) {
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j := 0
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for i := 0; i < 18; i++ {
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c.p[i] ^= getNextWord(key, &j)
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}
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j = 0
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var l, r uint32
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for i := 0; i < 18; i += 2 {
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l ^= getNextWord(salt, &j)
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r ^= getNextWord(salt, &j)
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l, r = encryptBlock(l, r, c)
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c.p[i], c.p[i+1] = l, r
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}
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for i := 0; i < 256; i += 2 {
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l ^= getNextWord(salt, &j)
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r ^= getNextWord(salt, &j)
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l, r = encryptBlock(l, r, c)
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c.s0[i], c.s0[i+1] = l, r
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}
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for i := 0; i < 256; i += 2 {
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l ^= getNextWord(salt, &j)
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r ^= getNextWord(salt, &j)
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l, r = encryptBlock(l, r, c)
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c.s1[i], c.s1[i+1] = l, r
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}
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for i := 0; i < 256; i += 2 {
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l ^= getNextWord(salt, &j)
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r ^= getNextWord(salt, &j)
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l, r = encryptBlock(l, r, c)
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c.s2[i], c.s2[i+1] = l, r
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}
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for i := 0; i < 256; i += 2 {
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l ^= getNextWord(salt, &j)
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r ^= getNextWord(salt, &j)
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l, r = encryptBlock(l, r, c)
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c.s3[i], c.s3[i+1] = l, r
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}
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}
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func encryptBlock(l, r uint32, c *Cipher) (uint32, uint32) {
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xl, xr := l, r
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xl ^= c.p[0]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[1]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[2]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[3]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[4]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[5]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[6]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[7]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[8]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[9]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[10]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[11]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[12]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[13]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[14]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[15]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[16]
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xr ^= c.p[17]
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return xr, xl
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}
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func decryptBlock(l, r uint32, c *Cipher) (uint32, uint32) {
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xl, xr := l, r
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xl ^= c.p[17]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[16]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[15]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[14]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[13]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[12]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[11]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[10]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[9]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[8]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[7]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[6]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[5]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[4]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[3]
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xr ^= ((c.s0[byte(xl>>24)] + c.s1[byte(xl>>16)]) ^ c.s2[byte(xl>>8)]) + c.s3[byte(xl)] ^ c.p[2]
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xl ^= ((c.s0[byte(xr>>24)] + c.s1[byte(xr>>16)]) ^ c.s2[byte(xr>>8)]) + c.s3[byte(xr)] ^ c.p[1]
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xr ^= c.p[0]
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return xr, xl
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}
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