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This commit is contained in:
Frank Denis 2018-02-14 14:39:43 +01:00
parent ac395b03fc
commit d85214252a
8 changed files with 58 additions and 146 deletions
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130
vendor/github.com/jedisct1/xsecretbox/sharedkey.go generated vendored
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@ -1,137 +1,12 @@
package xsecretbox
import (
"encoding/binary"
"errors"
"github.com/aead/chacha20/chacha"
"golang.org/x/crypto/curve25519"
)
func hChaCha20(inout *[32]byte) {
v00 := uint32(0x61707865)
v01 := uint32(0x3320646e)
v02 := uint32(0x79622d32)
v03 := uint32(0x6b206574)
v04 := binary.LittleEndian.Uint32(inout[0:])
v05 := binary.LittleEndian.Uint32(inout[4:])
v06 := binary.LittleEndian.Uint32(inout[8:])
v07 := binary.LittleEndian.Uint32(inout[12:])
v08 := binary.LittleEndian.Uint32(inout[16:])
v09 := binary.LittleEndian.Uint32(inout[20:])
v10 := binary.LittleEndian.Uint32(inout[24:])
v11 := binary.LittleEndian.Uint32(inout[28:])
v12 := uint32(0)
v13 := uint32(0)
v14 := uint32(0)
v15 := uint32(0)
for i := 0; i < 20; i += 2 {
v00 += v04
v12 ^= v00
v12 = (v12 << 16) | (v12 >> 16)
v08 += v12
v04 ^= v08
v04 = (v04 << 12) | (v04 >> 20)
v00 += v04
v12 ^= v00
v12 = (v12 << 8) | (v12 >> 24)
v08 += v12
v04 ^= v08
v04 = (v04 << 7) | (v04 >> 25)
v01 += v05
v13 ^= v01
v13 = (v13 << 16) | (v13 >> 16)
v09 += v13
v05 ^= v09
v05 = (v05 << 12) | (v05 >> 20)
v01 += v05
v13 ^= v01
v13 = (v13 << 8) | (v13 >> 24)
v09 += v13
v05 ^= v09
v05 = (v05 << 7) | (v05 >> 25)
v02 += v06
v14 ^= v02
v14 = (v14 << 16) | (v14 >> 16)
v10 += v14
v06 ^= v10
v06 = (v06 << 12) | (v06 >> 20)
v02 += v06
v14 ^= v02
v14 = (v14 << 8) | (v14 >> 24)
v10 += v14
v06 ^= v10
v06 = (v06 << 7) | (v06 >> 25)
v03 += v07
v15 ^= v03
v15 = (v15 << 16) | (v15 >> 16)
v11 += v15
v07 ^= v11
v07 = (v07 << 12) | (v07 >> 20)
v03 += v07
v15 ^= v03
v15 = (v15 << 8) | (v15 >> 24)
v11 += v15
v07 ^= v11
v07 = (v07 << 7) | (v07 >> 25)
v00 += v05
v15 ^= v00
v15 = (v15 << 16) | (v15 >> 16)
v10 += v15
v05 ^= v10
v05 = (v05 << 12) | (v05 >> 20)
v00 += v05
v15 ^= v00
v15 = (v15 << 8) | (v15 >> 24)
v10 += v15
v05 ^= v10
v05 = (v05 << 7) | (v05 >> 25)
v01 += v06
v12 ^= v01
v12 = (v12 << 16) | (v12 >> 16)
v11 += v12
v06 ^= v11
v06 = (v06 << 12) | (v06 >> 20)
v01 += v06
v12 ^= v01
v12 = (v12 << 8) | (v12 >> 24)
v11 += v12
v06 ^= v11
v06 = (v06 << 7) | (v06 >> 25)
v02 += v07
v13 ^= v02
v13 = (v13 << 16) | (v13 >> 16)
v08 += v13
v07 ^= v08
v07 = (v07 << 12) | (v07 >> 20)
v02 += v07
v13 ^= v02
v13 = (v13 << 8) | (v13 >> 24)
v08 += v13
v07 ^= v08
v07 = (v07 << 7) | (v07 >> 25)
v03 += v04
v14 ^= v03
v14 = (v14 << 16) | (v14 >> 16)
v09 += v14
v04 ^= v09
v04 = (v04 << 12) | (v04 >> 20)
v03 += v04
v14 ^= v03
v14 = (v14 << 8) | (v14 >> 24)
v09 += v14
v04 ^= v09
v04 = (v04 << 7) | (v04 >> 25)
}
binary.LittleEndian.PutUint32(inout[0:], v00)
binary.LittleEndian.PutUint32(inout[4:], v01)
binary.LittleEndian.PutUint32(inout[8:], v02)
binary.LittleEndian.PutUint32(inout[12:], v03)
binary.LittleEndian.PutUint32(inout[16:], v12)
binary.LittleEndian.PutUint32(inout[20:], v13)
binary.LittleEndian.PutUint32(inout[24:], v14)
binary.LittleEndian.PutUint32(inout[28:], v15)
}
// SharedKey computes a shared secret compatible with the one used by `crypto_box_xchacha20poly1305``
func SharedKey(secretKey [32]byte, publicKey [32]byte) ([32]byte, error) {
var sharedKey [32]byte
@ -143,6 +18,7 @@ func SharedKey(secretKey [32]byte, publicKey [32]byte) ([32]byte, error) {
if c == 0 {
return sharedKey, errors.New("weak public key")
}
hChaCha20(&sharedKey)
var nonce [16]byte
chacha.HChaCha20(&sharedKey, &nonce, &sharedKey)
return sharedKey, nil
}