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[dev.boringcrypto] crypto/ecdsa: use BoringCrypto
Change-Id: I108e0a527bddd673b16582d206e0697341d0a0ea Reviewed-on: https://go-review.googlesource.com/55478 Run-TryBot: Russ Cox <[email protected]> TryBot-Result: Gobot Gobot <[email protected]> Reviewed-by: Adam Langley <[email protected]>
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// 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. | ||
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package ecdsa | ||
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import ( | ||
"crypto/elliptic" | ||
"crypto/internal/boring" | ||
"math/big" | ||
) | ||
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// Cached conversions from Go PublicKey/PrivateKey to BoringCrypto. | ||
// | ||
// A new 'boring atomic.Value' field in both PublicKey and PrivateKey | ||
// serves as a cache for the most recent conversion. The cache is an | ||
// atomic.Value because code might reasonably set up a key and then | ||
// (thinking it immutable) use it from multiple goroutines simultaneously. | ||
// The first operation initializes the cache; if there are multiple simultaneous | ||
// first operations, they will do redundant work but not step on each other. | ||
// | ||
// We could just assume that once used in a Sign or Verify 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. | ||
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type boringPub struct { | ||
key *boring.PublicKeyECDSA | ||
orig publicKey | ||
} | ||
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// copy of PublicKey without the atomic.Value field, to placate vet. | ||
type publicKey struct { | ||
elliptic.Curve | ||
X, Y *big.Int | ||
} | ||
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func boringPublicKey(pub *PublicKey) (*boring.PublicKeyECDSA, error) { | ||
b, _ := pub.boring.Load().(boringPub) | ||
if publicKeyEqual(&b.orig, pub) { | ||
return b.key, nil | ||
} | ||
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b.orig = copyPublicKey(pub) | ||
key, err := boring.NewPublicKeyECDSA(b.orig.Curve.Params().Name, b.orig.X, b.orig.Y) | ||
if err != nil { | ||
return nil, err | ||
} | ||
b.key = key | ||
pub.boring.Store(b) | ||
return key, nil | ||
} | ||
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type boringPriv struct { | ||
key *boring.PrivateKeyECDSA | ||
orig privateKey | ||
} | ||
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// copy of PrivateKey without the atomic.Value field, to placate vet. | ||
type privateKey struct { | ||
publicKey | ||
D *big.Int | ||
} | ||
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func boringPrivateKey(priv *PrivateKey) (*boring.PrivateKeyECDSA, error) { | ||
b, _ := priv.boring.Load().(boringPriv) | ||
if privateKeyEqual(&b.orig, priv) { | ||
return b.key, nil | ||
} | ||
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b.orig = copyPrivateKey(priv) | ||
key, err := boring.NewPrivateKeyECDSA(b.orig.Curve.Params().Name, b.orig.X, b.orig.Y, b.orig.D) | ||
if err != nil { | ||
return nil, err | ||
} | ||
b.key = key | ||
priv.boring.Store(b) | ||
return key, nil | ||
} | ||
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func publicKeyEqual(k1 *publicKey, k2 *PublicKey) bool { | ||
return k1.X != nil && | ||
k1.Curve.Params() == k2.Curve.Params() && | ||
k1.X.Cmp(k2.X) == 0 && | ||
k1.Y.Cmp(k2.Y) == 0 | ||
} | ||
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func privateKeyEqual(k1 *privateKey, k2 *PrivateKey) bool { | ||
return publicKeyEqual(&k1.publicKey, &k2.PublicKey) && | ||
k1.D.Cmp(k2.D) == 0 | ||
} | ||
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func copyPublicKey(k *PublicKey) publicKey { | ||
return publicKey{ | ||
Curve: k.Curve, | ||
X: new(big.Int).Set(k.X), | ||
Y: new(big.Int).Set(k.Y), | ||
} | ||
} | ||
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func copyPrivateKey(k *PrivateKey) privateKey { | ||
return privateKey{ | ||
publicKey: copyPublicKey(&k.PublicKey), | ||
D: new(big.Int).Set(k.D), | ||
} | ||
} |
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