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crypto.go
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crypto.go
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package httpsignatures
import (
"crypto"
"crypto/ecdsa"
"crypto/hmac"
"crypto/rand"
"crypto/rsa"
"crypto/subtle"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
"fmt"
"hash"
"math/big"
)
// SignatureHashAlgorithm interface to create/verify Signature using secret keys
// Algorithm return algorithm name
// Create create new signature
// Verify verify passed signature
type SignatureHashAlgorithm interface {
Algorithm() string
Create(secret Secret, data []byte) ([]byte, error)
Verify(secret Secret, data []byte, signature []byte) error
}
// DigestHashAlgorithm interface to create/verify digest HMAC hash
type DigestHashAlgorithm interface {
Algorithm() string
Create(data []byte) ([]byte, error)
Verify(data []byte, digest []byte) error
}
// ErrCrypto errors during Create/Verify signature functions
type ErrCrypto struct {
Message string
Err error
}
// ErrHS error message
func (e *ErrCrypto) Error() string {
if e == nil {
return ""
}
if e.Err != nil {
return fmt.Sprintf("ErrCrypto: %s: %s", e.Message, e.Err.Error())
}
return fmt.Sprintf("ErrCrypto: %s", e.Message)
}
// ECDSASignature ECDSA signature
type ECDSASignature struct {
R, S *big.Int
}
// ED25519PrivateKey ED25519 PrivateKey
type ED25519PrivateKey struct {
Version int
ObjectIdentifier struct {
ObjectIdentifier asn1.ObjectIdentifier
}
PrivateKey []byte
}
// ED25519PublicKey ED25519 PublicKey
type ED25519PublicKey struct {
ObjectIdentifier struct {
ObjectIdentifier asn1.ObjectIdentifier
}
PublicKey asn1.BitString
}
func digestHashAlgorithmVerify(newHash func() hash.Hash, data []byte, digest []byte) error {
expected, err := digestHashAlgorithmCreate(newHash, data)
if err != nil {
return err
}
if subtle.ConstantTimeCompare(digest, expected) != 1 {
return &ErrCrypto{"wrong hash", nil}
}
return nil
}
func digestHashAlgorithmCreate(newHash func() hash.Hash, data []byte) ([]byte, error) {
h := newHash()
_, err := h.Write(data)
if err != nil {
return nil, &ErrCrypto{"error creating hash", err}
}
return h.Sum(nil), nil
}
func signatureHashAlgorithmVerify(newHash func() hash.Hash, secret Secret, data []byte, signature []byte) error {
expected, err := signatureHashAlgorithmCreate(newHash, secret, data)
if err != nil {
return err
}
if !hmac.Equal(signature, expected) {
return &ErrCrypto{"wrong signature", nil}
}
return nil
}
func signatureHashAlgorithmCreate(newHash func() hash.Hash, secret Secret, data []byte) ([]byte, error) {
if len(secret.PrivateKey) == 0 {
return nil, &ErrCrypto{"no private key found", nil}
}
mac := hmac.New(newHash, []byte(secret.PrivateKey))
_, err := mac.Write(data)
if err != nil {
return nil, &ErrCrypto{"error creating signature", err}
}
return mac.Sum(nil), nil
}
func signatureRsaAlgorithmVerify(t string, newHash func() hash.Hash, hash crypto.Hash, secret Secret, data []byte,
signature []byte) error {
publicKey, err := loadPublicKey(secret.PublicKey)
if err != nil {
return err
}
var publicKeyRsa *rsa.PublicKey
switch publicKey := publicKey.(type) {
case *rsa.PublicKey:
publicKeyRsa = publicKey
default:
return &ErrCrypto{"unknown type of public key", nil}
}
h := newHash()
_, _ = h.Write(data)
switch t {
case algRsaSha256, algRsaSha512:
err = rsa.VerifyPKCS1v15(publicKeyRsa, hash, h.Sum(nil), signature)
case algRsaSsaPssSha256, algRsaSsaPssSha512:
var opts rsa.PSSOptions
opts.SaltLength = rsa.PSSSaltLengthEqualsHash
err = rsa.VerifyPSS(publicKeyRsa, hash, h.Sum(nil), signature, &opts)
default:
return &ErrCrypto{fmt.Sprintf("unsupported verify algorithm type %s", t), err}
}
if err != nil {
return &ErrCrypto{"error verify signature", err}
}
return nil
}
func signatureRsaAlgorithmCreate(t string, newHash func() hash.Hash, hash crypto.Hash, secret Secret,
data []byte) ([]byte, error) {
privateKey, err := loadPrivateKey(secret.PrivateKey)
if err != nil {
return nil, err
}
var privateKeyRsa *rsa.PrivateKey
switch privateKey := privateKey.(type) {
case *rsa.PrivateKey:
privateKeyRsa = privateKey
default:
return nil, &ErrCrypto{"unknown private key type", nil}
}
h := newHash()
_, _ = h.Write(data)
switch t {
case algRsaSha256, algRsaSha512:
return rsa.SignPKCS1v15(rand.Reader, privateKeyRsa, hash, h.Sum(nil))
case algRsaSsaPssSha256, algRsaSsaPssSha512:
var opts rsa.PSSOptions
opts.SaltLength = rsa.PSSSaltLengthEqualsHash
return rsa.SignPSS(rand.Reader, privateKeyRsa, hash, h.Sum(nil), &opts)
default:
return nil, &ErrCrypto{fmt.Sprintf("unsupported algorithm type %s", t), err}
}
}
func signatureEcdsaAlgorithmVerify(t string, newHash func() hash.Hash, secret Secret, data []byte,
signature []byte) error {
publicKey, err := loadPublicKey(secret.PublicKey)
if err != nil {
return err
}
var publicKeyEcdsa *ecdsa.PublicKey
switch publicKey := publicKey.(type) {
case *ecdsa.PublicKey:
publicKeyEcdsa = publicKey
default:
return &ErrCrypto{"unknown type of public key", nil}
}
sig := &ECDSASignature{}
_, err = asn1.Unmarshal(signature, sig)
if err != nil {
return &ErrCrypto{"error Unmarshal signature", err}
}
h := newHash()
_, _ = h.Write(data)
switch t {
case algEcdsaSha256, algEcdsaSha512:
res := ecdsa.Verify(publicKeyEcdsa, h.Sum(nil), sig.R, sig.S)
if !res {
return &ErrCrypto{"signature verification error", nil}
}
default:
return &ErrCrypto{fmt.Sprintf("unsupported verify algorithm type %s", t), err}
}
return nil
}
func signatureEcdsaAlgorithmCreate(t string, newHash func() hash.Hash, secret Secret,
data []byte) ([]byte, error) {
privateKey, err := loadPrivateKey(secret.PrivateKey)
if err != nil {
return nil, err
}
var privateKeyEcdsa *ecdsa.PrivateKey
switch privateKey := privateKey.(type) {
case *ecdsa.PrivateKey:
privateKeyEcdsa = privateKey
default:
return nil, &ErrCrypto{"unknown private key type", nil}
}
h := newHash()
_, _ = h.Write(data)
switch t {
case algEcdsaSha256, algEcdsaSha512:
r, s, err := ecdsa.Sign(rand.Reader, privateKeyEcdsa, h.Sum(nil))
if err != nil {
return nil, err
}
sig, _ := asn1.Marshal(ECDSASignature{
R: r,
S: s,
})
return sig, nil
default:
return nil, &ErrCrypto{fmt.Sprintf("unsupported algorithm type %s", t), err}
}
}
func loadPrivateKey(pk string) (crypto.PrivateKey, error) {
block, _ := pem.Decode([]byte(pk))
if block == nil {
return nil, &ErrCrypto{"no private key found", nil}
}
if privateKey, err := x509.ParsePKCS8PrivateKey(block.Bytes); err == nil {
switch privateKey := privateKey.(type) {
case *rsa.PrivateKey, *ecdsa.PrivateKey:
return privateKey, nil
default:
return nil, &ErrCrypto{"unknown private key type in PKCS#8", nil}
}
}
if privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes); err == nil {
return privateKey, nil
}
if privateKey, err := x509.ParseECPrivateKey(block.Bytes); err == nil {
return privateKey, nil
}
return nil, &ErrCrypto{fmt.Sprintf("unsupported private key type %s", block.Type), nil}
}
func loadPublicKey(pk string) (crypto.PublicKey, error) {
block, _ := pem.Decode([]byte(pk))
if block == nil {
return nil, &ErrCrypto{"no public key found", nil}
}
pub, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return nil, &ErrCrypto{"error ParsePKIXPublicKey", err}
}
return pub, nil
}