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// Copyright (C) 2017. See AUTHORS.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package openssl
// #include "shim.h"
import "C"
import (
"errors"
"io/ioutil"
"runtime"
"unsafe"
)
type Method *C.EVP_MD
var (
SHA1_Method Method = C.X_EVP_sha1()
SHA256_Method Method = C.X_EVP_sha256()
SHA512_Method Method = C.X_EVP_sha512()
)
// Constants for the various key types.
// Mapping of name -> NID taken from openssl/evp.h
const (
KeyTypeNone = NID_undef
KeyTypeRSA = NID_rsaEncryption
KeyTypeRSA2 = NID_rsa
KeyTypeDSA = NID_dsa
KeyTypeDSA1 = NID_dsa_2
KeyTypeDSA2 = NID_dsaWithSHA
KeyTypeDSA3 = NID_dsaWithSHA1
KeyTypeDSA4 = NID_dsaWithSHA1_2
KeyTypeDH = NID_dhKeyAgreement
KeyTypeDHX = NID_dhpublicnumber
KeyTypeEC = NID_X9_62_id_ecPublicKey
KeyTypeHMAC = NID_hmac
KeyTypeCMAC = NID_cmac
KeyTypeTLS1PRF = NID_tls1_prf
KeyTypeHKDF = NID_hkdf
)
type PrivateKey interface {
PublicKey
// Signs the data using PKCS1.15
SignPKCS1v15(Method, []byte) ([]byte, error)
// MarshalPKCS1PrivateKeyPEM converts the private key to PEM-encoded PKCS1
// format
MarshalPKCS1PrivateKeyPEM() (pem_block []byte, err error)
// MarshalPKCS1PrivateKeyDER converts the private key to DER-encoded PKCS1
// format
MarshalPKCS1PrivateKeyDER() (der_block []byte, err error)
}
type pKey struct {
key *C.EVP_PKEY
}
func (key *pKey) evpPKey() *C.EVP_PKEY { return key.key }
func (key *pKey) SignPKCS1v15(method Method, data []byte) ([]byte, error) {
ctx := C.X_EVP_MD_CTX_new()
defer C.X_EVP_MD_CTX_free(ctx)
if 1 != C.X_EVP_SignInit(ctx, method) {
return nil, errors.New("signpkcs1v15: failed to init signature")
}
if len(data) > 0 {
if 1 != C.X_EVP_SignUpdate(
ctx, unsafe.Pointer(&data[0]), C.uint(len(data))) {
return nil, errors.New("signpkcs1v15: failed to update signature")
}
}
sig := make([]byte, C.X_EVP_PKEY_size(key.key))
var sigblen C.uint
if 1 != C.X_EVP_SignFinal(ctx,
((*C.uchar)(unsafe.Pointer(&sig[0]))), &sigblen, key.key) {
return nil, errors.New("signpkcs1v15: failed to finalize signature")
}
return sig[:sigblen], nil
}
func (key *pKey) VerifyPKCS1v15(method Method, data, sig []byte) error {
ctx := C.X_EVP_MD_CTX_new()
defer C.X_EVP_MD_CTX_free(ctx)
if 1 != C.X_EVP_VerifyInit(ctx, method) {
return errors.New("verifypkcs1v15: failed to init verify")
}
if len(data) > 0 {
if 1 != C.X_EVP_VerifyUpdate(
ctx, unsafe.Pointer(&data[0]), C.uint(len(data))) {
return errors.New("verifypkcs1v15: failed to update verify")
}
}
if 1 != C.X_EVP_VerifyFinal(ctx,
((*C.uchar)(unsafe.Pointer(&sig[0]))), C.uint(len(sig)), key.key) {
return errors.New("verifypkcs1v15: failed to finalize verify")
}
return nil
}
func (key *pKey) MarshalPKCS1PrivateKeyDER() (der_block []byte,
err error) {
bio := C.BIO_new(C.BIO_s_mem())
if bio == nil {
return nil, errors.New("failed to allocate memory BIO")
}
defer C.BIO_free(bio)
if int(C.i2d_PrivateKey_bio(bio, key.key)) != 1 {
return nil, errors.New("failed dumping private key der")
}
return ioutil.ReadAll(asAnyBio(bio))
}
func (key *pKey) MarshalPKIXPublicKeyPEM() (pem_block []byte,
err error) {
bio := C.BIO_new(C.BIO_s_mem())
if bio == nil {
return nil, errors.New("failed to allocate memory BIO")
}
defer C.BIO_free(bio)
if int(C.PEM_write_bio_PUBKEY(bio, key.key)) != 1 {
return nil, errors.New("failed dumping public key pem")
}
return ioutil.ReadAll(asAnyBio(bio))
}
func (key *pKey) MarshalPKIXPublicKeyDER() (der_block []byte,
err error) {
bio := C.BIO_new(C.BIO_s_mem())
if bio == nil {
return nil, errors.New("failed to allocate memory BIO")
}
defer C.BIO_free(bio)
if int(C.i2d_PUBKEY_bio(bio, key.key)) != 1 {
return nil, errors.New("failed dumping public key der")
}
return ioutil.ReadAll(asAnyBio(bio))
}
// LoadPrivateKeyFromPEM loads a private key from a PEM-encoded block.
func LoadPrivateKeyFromPEM(pem_block []byte) (PrivateKey, error) {
if len(pem_block) == 0 {
return nil, errors.New("empty pem block")
}
bio := C.BIO_new_mem_buf(unsafe.Pointer(&pem_block[0]),
C.int(len(pem_block)))
if bio == nil {
return nil, errors.New("failed creating bio")
}
defer C.BIO_free(bio)
key := C.PEM_read_bio_PrivateKey(bio, nil, nil, nil)
if key == nil {
return nil, errors.New("failed reading private key")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.X_EVP_PKEY_free(p.key)
})
return p, nil
}
// LoadPrivateKeyFromPEMWithPassword loads a private key from a PEM-encoded block.
func LoadPrivateKeyFromPEMWithPassword(pem_block []byte, password string) (
PrivateKey, error) {
if len(pem_block) == 0 {
return nil, errors.New("empty pem block")
}
bio := C.BIO_new_mem_buf(unsafe.Pointer(&pem_block[0]),
C.int(len(pem_block)))
if bio == nil {
return nil, errors.New("failed creating bio")
}
defer C.BIO_free(bio)
cs := C.CString(password)
defer C.free(unsafe.Pointer(cs))
key := C.PEM_read_bio_PrivateKey(bio, nil, nil, unsafe.Pointer(cs))
if key == nil {
return nil, errors.New("failed reading private key")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.X_EVP_PKEY_free(p.key)
})
return p, nil
}
// LoadPrivateKeyFromDER loads a private key from a DER-encoded block.
func LoadPrivateKeyFromDER(der_block []byte) (PrivateKey, error) {
if len(der_block) == 0 {
return nil, errors.New("empty der block")
}
bio := C.BIO_new_mem_buf(unsafe.Pointer(&der_block[0]),
C.int(len(der_block)))
if bio == nil {
return nil, errors.New("failed creating bio")
}
defer C.BIO_free(bio)
key := C.d2i_PrivateKey_bio(bio, nil)
if key == nil {
return nil, errors.New("failed reading private key der")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.X_EVP_PKEY_free(p.key)
})
return p, nil
}
// LoadPrivateKeyFromPEMWidthPassword loads a private key from a PEM-encoded block.
// Backwards-compatible with typo
func LoadPrivateKeyFromPEMWidthPassword(pem_block []byte, password string) (
PrivateKey, error) {
return LoadPrivateKeyFromPEMWithPassword(pem_block, password)
}
// LoadPublicKeyFromPEM loads a public key from a PEM-encoded block.
func LoadPublicKeyFromPEM(pem_block []byte) (PublicKey, error) {
if len(pem_block) == 0 {
return nil, errors.New("empty pem block")
}
bio := C.BIO_new_mem_buf(unsafe.Pointer(&pem_block[0]),
C.int(len(pem_block)))
if bio == nil {
return nil, errors.New("failed creating bio")
}
defer C.BIO_free(bio)
key := C.PEM_read_bio_PUBKEY(bio, nil, nil, nil)
if key == nil {
return nil, errors.New("failed reading public key der")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.X_EVP_PKEY_free(p.key)
})
return p, nil
}
// LoadPublicKeyFromDER loads a public key from a DER-encoded block.
func LoadPublicKeyFromDER(der_block []byte) (PublicKey, error) {
if len(der_block) == 0 {
return nil, errors.New("empty der block")
}
bio := C.BIO_new_mem_buf(unsafe.Pointer(&der_block[0]),
C.int(len(der_block)))
if bio == nil {
return nil, errors.New("failed creating bio")
}
defer C.BIO_free(bio)
key := C.d2i_PUBKEY_bio(bio, nil)
if key == nil {
return nil, errors.New("failed reading public key der")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.X_EVP_PKEY_free(p.key)
})
return p, nil
}
// GenerateRSAKey generates a new RSA private key with an exponent of 3.
func GenerateRSAKey(bits int) (PrivateKey, error) {
return GenerateRSAKeyWithExponent(bits, 3)
}
// GenerateRSAKeyWithExponent generates a new RSA private key.
func GenerateRSAKeyWithExponent(bits int, exponent int) (PrivateKey, error) {
rsa := C.RSA_generate_key(C.int(bits), C.ulong(exponent), nil, nil)
if rsa == nil {
return nil, errors.New("failed to generate RSA key")
}
key := C.X_EVP_PKEY_new()
if key == nil {
return nil, errors.New("failed to allocate EVP_PKEY")
}
if C.X_EVP_PKEY_assign_charp(key, C.EVP_PKEY_RSA, (*C.char)(unsafe.Pointer(rsa))) != 1 {
C.X_EVP_PKEY_free(key)
return nil, errors.New("failed to assign RSA key")
}
p := &pKey{key: key}
runtime.SetFinalizer(p, func(p *pKey) {
C.X_EVP_PKEY_free(p.key)
})
return p, nil
}
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