File size: 3,351 Bytes
4bcc2be | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | // Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build boringcrypto
package rsa
import (
"crypto/internal/boring"
"crypto/internal/boring/bbig"
"crypto/internal/boring/bcache"
"math/big"
)
// Cached conversions from Go PublicKey/PrivateKey to BoringCrypto.
//
// The first operation on a PublicKey or PrivateKey makes a parallel
// BoringCrypto key and saves it in pubCache or privCache.
//
// We could just assume that once used in a sign/verify/encrypt/decrypt operation,
// a particular key is never again modified, but that has not been a
// stated assumption before. Just in case there is any existing code that
// does modify the key between operations, we save the original values
// alongside the cached BoringCrypto key and check that the real key
// still matches before using the cached key. The theory is that the real
// operations are significantly more expensive than the comparison.
type boringPub struct {
key *boring.PublicKeyRSA
orig PublicKey
}
var pubCache bcache.Cache[PublicKey, boringPub]
var privCache bcache.Cache[PrivateKey, boringPriv]
func init() {
pubCache.Register()
privCache.Register()
}
func boringPublicKey(pub *PublicKey) (*boring.PublicKeyRSA, error) {
b := pubCache.Get(pub)
if b != nil && publicKeyEqual(&b.orig, pub) {
return b.key, nil
}
b = new(boringPub)
b.orig = copyPublicKey(pub)
key, err := boring.NewPublicKeyRSA(bbig.Enc(b.orig.N), bbig.Enc(big.NewInt(int64(b.orig.E))))
if err != nil {
return nil, err
}
b.key = key
pubCache.Put(pub, b)
return key, nil
}
type boringPriv struct {
key *boring.PrivateKeyRSA
orig PrivateKey
}
func boringPrivateKey(priv *PrivateKey) (*boring.PrivateKeyRSA, error) {
b := privCache.Get(priv)
if b != nil && privateKeyEqual(&b.orig, priv) {
return b.key, nil
}
b = new(boringPriv)
b.orig = copyPrivateKey(priv)
var N, E, D, P, Q, Dp, Dq, Qinv *big.Int
N = b.orig.N
E = big.NewInt(int64(b.orig.E))
D = b.orig.D
if len(b.orig.Primes) == 2 {
P = b.orig.Primes[0]
Q = b.orig.Primes[1]
Dp = b.orig.Precomputed.Dp
Dq = b.orig.Precomputed.Dq
Qinv = b.orig.Precomputed.Qinv
}
key, err := boring.NewPrivateKeyRSA(bbig.Enc(N), bbig.Enc(E), bbig.Enc(D), bbig.Enc(P), bbig.Enc(Q), bbig.Enc(Dp), bbig.Enc(Dq), bbig.Enc(Qinv))
if err != nil {
return nil, err
}
b.key = key
privCache.Put(priv, b)
return key, nil
}
func publicKeyEqual(k1, k2 *PublicKey) bool {
return k1.N != nil &&
k1.N.Cmp(k2.N) == 0 &&
k1.E == k2.E
}
func copyPublicKey(k *PublicKey) PublicKey {
return PublicKey{
N: new(big.Int).Set(k.N),
E: k.E,
}
}
func privateKeyEqual(k1, k2 *PrivateKey) bool {
return publicKeyEqual(&k1.PublicKey, &k2.PublicKey) &&
k1.D.Cmp(k2.D) == 0
}
func copyPrivateKey(k *PrivateKey) PrivateKey {
dst := PrivateKey{
PublicKey: copyPublicKey(&k.PublicKey),
D: new(big.Int).Set(k.D),
}
dst.Primes = make([]*big.Int, len(k.Primes))
for i, p := range k.Primes {
dst.Primes[i] = new(big.Int).Set(p)
}
if x := k.Precomputed.Dp; x != nil {
dst.Precomputed.Dp = new(big.Int).Set(x)
}
if x := k.Precomputed.Dq; x != nil {
dst.Precomputed.Dq = new(big.Int).Set(x)
}
if x := k.Precomputed.Qinv; x != nil {
dst.Precomputed.Qinv = new(big.Int).Set(x)
}
return dst
}
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