File size: 4,854 Bytes
61bba11 | 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 | // 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 && linux && (amd64 || arm64) && !android && !msan
package boring
// #include "goboringcrypto.h"
import "C"
import (
"errors"
"runtime"
)
type ecdsaSignature struct {
R, S BigInt
}
type PrivateKeyECDSA struct {
key *C.GO_EC_KEY
}
func (k *PrivateKeyECDSA) finalize() {
C._goboringcrypto_EC_KEY_free(k.key)
}
type PublicKeyECDSA struct {
key *C.GO_EC_KEY
}
func (k *PublicKeyECDSA) finalize() {
C._goboringcrypto_EC_KEY_free(k.key)
}
var errUnknownCurve = errors.New("boringcrypto: unknown elliptic curve")
func curveNID(curve string) (C.int, error) {
switch curve {
case "P-224":
return C.GO_NID_secp224r1, nil
case "P-256":
return C.GO_NID_X9_62_prime256v1, nil
case "P-384":
return C.GO_NID_secp384r1, nil
case "P-521":
return C.GO_NID_secp521r1, nil
}
return 0, errUnknownCurve
}
func NewPublicKeyECDSA(curve string, X, Y BigInt) (*PublicKeyECDSA, error) {
key, err := newECKey(curve, X, Y)
if err != nil {
return nil, err
}
k := &PublicKeyECDSA{key}
// Note: Because of the finalizer, any time k.key is passed to cgo,
// that call must be followed by a call to runtime.KeepAlive(k),
// to make sure k is not collected (and finalized) before the cgo
// call returns.
runtime.SetFinalizer(k, (*PublicKeyECDSA).finalize)
return k, nil
}
func newECKey(curve string, X, Y BigInt) (*C.GO_EC_KEY, error) {
nid, err := curveNID(curve)
if err != nil {
return nil, err
}
key := C._goboringcrypto_EC_KEY_new_by_curve_name(nid)
if key == nil {
return nil, fail("EC_KEY_new_by_curve_name")
}
group := C._goboringcrypto_EC_KEY_get0_group(key)
pt := C._goboringcrypto_EC_POINT_new(group)
if pt == nil {
C._goboringcrypto_EC_KEY_free(key)
return nil, fail("EC_POINT_new")
}
bx := bigToBN(X)
by := bigToBN(Y)
ok := bx != nil && by != nil && C._goboringcrypto_EC_POINT_set_affine_coordinates_GFp(group, pt, bx, by, nil) != 0 &&
C._goboringcrypto_EC_KEY_set_public_key(key, pt) != 0
if bx != nil {
C._goboringcrypto_BN_free(bx)
}
if by != nil {
C._goboringcrypto_BN_free(by)
}
C._goboringcrypto_EC_POINT_free(pt)
if !ok {
C._goboringcrypto_EC_KEY_free(key)
return nil, fail("EC_POINT_set_affine_coordinates_GFp")
}
return key, nil
}
func NewPrivateKeyECDSA(curve string, X, Y BigInt, D BigInt) (*PrivateKeyECDSA, error) {
key, err := newECKey(curve, X, Y)
if err != nil {
return nil, err
}
bd := bigToBN(D)
ok := bd != nil && C._goboringcrypto_EC_KEY_set_private_key(key, bd) != 0
if bd != nil {
C._goboringcrypto_BN_free(bd)
}
if !ok {
C._goboringcrypto_EC_KEY_free(key)
return nil, fail("EC_KEY_set_private_key")
}
k := &PrivateKeyECDSA{key}
// Note: Because of the finalizer, any time k.key is passed to cgo,
// that call must be followed by a call to runtime.KeepAlive(k),
// to make sure k is not collected (and finalized) before the cgo
// call returns.
runtime.SetFinalizer(k, (*PrivateKeyECDSA).finalize)
return k, nil
}
func SignMarshalECDSA(priv *PrivateKeyECDSA, hash []byte) ([]byte, error) {
size := C._goboringcrypto_ECDSA_size(priv.key)
sig := make([]byte, size)
var sigLen C.uint
if C._goboringcrypto_ECDSA_sign(0, base(hash), C.size_t(len(hash)), base(sig), &sigLen, priv.key) == 0 {
return nil, fail("ECDSA_sign")
}
runtime.KeepAlive(priv)
return sig[:sigLen], nil
}
func VerifyECDSA(pub *PublicKeyECDSA, hash []byte, sig []byte) bool {
ok := C._goboringcrypto_ECDSA_verify(0, base(hash), C.size_t(len(hash)), base(sig), C.size_t(len(sig)), pub.key) != 0
runtime.KeepAlive(pub)
return ok
}
func GenerateKeyECDSA(curve string) (X, Y, D BigInt, err error) {
nid, err := curveNID(curve)
if err != nil {
return nil, nil, nil, err
}
key := C._goboringcrypto_EC_KEY_new_by_curve_name(nid)
if key == nil {
return nil, nil, nil, fail("EC_KEY_new_by_curve_name")
}
defer C._goboringcrypto_EC_KEY_free(key)
if C._goboringcrypto_EC_KEY_generate_key_fips(key) == 0 {
return nil, nil, nil, fail("EC_KEY_generate_key_fips")
}
group := C._goboringcrypto_EC_KEY_get0_group(key)
pt := C._goboringcrypto_EC_KEY_get0_public_key(key)
bd := C._goboringcrypto_EC_KEY_get0_private_key(key)
if pt == nil || bd == nil {
return nil, nil, nil, fail("EC_KEY_get0_private_key")
}
bx := C._goboringcrypto_BN_new()
if bx == nil {
return nil, nil, nil, fail("BN_new")
}
defer C._goboringcrypto_BN_free(bx)
by := C._goboringcrypto_BN_new()
if by == nil {
return nil, nil, nil, fail("BN_new")
}
defer C._goboringcrypto_BN_free(by)
if C._goboringcrypto_EC_POINT_get_affine_coordinates_GFp(group, pt, bx, by, nil) == 0 {
return nil, nil, nil, fail("EC_POINT_get_affine_coordinates_GFp")
}
return bnToBig(bx), bnToBig(by), bnToBig(bd), nil
}
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