a685e3fc98
Vndr has a simpler configuration and allows pointing to forked packages. Additionally other docker projects are now using vndr making vendoring in distribution more consistent. Updates letsencrypt to use fork. No longer uses sub-vendored packages. Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
109 lines
2.5 KiB
Go
109 lines
2.5 KiB
Go
/*-
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* Copyright 2014 Square Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package josecipher
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import (
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"crypto/cipher"
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"crypto/subtle"
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"encoding/binary"
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"errors"
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)
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var defaultIV = []byte{0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6, 0xA6}
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// KeyWrap implements NIST key wrapping; it wraps a content encryption key (cek) with the given block cipher.
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func KeyWrap(block cipher.Block, cek []byte) ([]byte, error) {
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if len(cek)%8 != 0 {
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return nil, errors.New("square/go-jose: key wrap input must be 8 byte blocks")
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}
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n := len(cek) / 8
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r := make([][]byte, n)
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for i := range r {
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r[i] = make([]byte, 8)
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copy(r[i], cek[i*8:])
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}
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buffer := make([]byte, 16)
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tBytes := make([]byte, 8)
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copy(buffer, defaultIV)
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for t := 0; t < 6*n; t++ {
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copy(buffer[8:], r[t%n])
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block.Encrypt(buffer, buffer)
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binary.BigEndian.PutUint64(tBytes, uint64(t+1))
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for i := 0; i < 8; i++ {
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buffer[i] = buffer[i] ^ tBytes[i]
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}
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copy(r[t%n], buffer[8:])
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}
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out := make([]byte, (n+1)*8)
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copy(out, buffer[:8])
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for i := range r {
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copy(out[(i+1)*8:], r[i])
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}
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return out, nil
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}
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// KeyUnwrap implements NIST key unwrapping; it unwraps a content encryption key (cek) with the given block cipher.
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func KeyUnwrap(block cipher.Block, ciphertext []byte) ([]byte, error) {
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if len(ciphertext)%8 != 0 {
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return nil, errors.New("square/go-jose: key wrap input must be 8 byte blocks")
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}
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n := (len(ciphertext) / 8) - 1
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r := make([][]byte, n)
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for i := range r {
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r[i] = make([]byte, 8)
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copy(r[i], ciphertext[(i+1)*8:])
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}
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buffer := make([]byte, 16)
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tBytes := make([]byte, 8)
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copy(buffer[:8], ciphertext[:8])
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for t := 6*n - 1; t >= 0; t-- {
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binary.BigEndian.PutUint64(tBytes, uint64(t+1))
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for i := 0; i < 8; i++ {
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buffer[i] = buffer[i] ^ tBytes[i]
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}
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copy(buffer[8:], r[t%n])
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block.Decrypt(buffer, buffer)
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copy(r[t%n], buffer[8:])
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}
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if subtle.ConstantTimeCompare(buffer[:8], defaultIV) == 0 {
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return nil, errors.New("square/go-jose: failed to unwrap key")
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}
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out := make([]byte, n*8)
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for i := range r {
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copy(out[i*8:], r[i])
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}
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return out, nil
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}
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