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register.go
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register.go
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package jwt
import (
"crypto"
"crypto/hmac"
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"math/big"
)
// KeyRegister contains recognized credentials.
type KeyRegister struct {
ECDSAs []*ecdsa.PublicKey // ECDSA credentials
RSAs []*rsa.PublicKey // RSA credentials
Secrets [][]byte // HMAC credentials
}
// Check parses a JWT and returns the claims set if, and only if, the signature
// checks out. Note that this excludes unsecured JWTs [ErrUnsecured].
// See Claims.Valid to complete the verification.
func (reg *KeyRegister) Check(token []byte) (*Claims, error) {
header, buf, err := parseHeader(token)
if err != nil {
return nil, err
}
var verifySig func(content, sig []byte, hash crypto.Hash) error
hash, err := header.match(HMACAlgs)
if err == nil {
verifySig = func(content, sig []byte, hash crypto.Hash) error {
for _, secret := range reg.Secrets {
digest := hmac.New(hash.New, secret)
digest.Write(content)
if hmac.Equal(sig, digest.Sum(sig[len(sig):])) {
return nil
}
}
return ErrSigMiss
}
} else if err != ErrAlgUnk {
return nil, err
} else if hash, err = header.match(RSAAlgs); err == nil {
verifySig = func(content, sig []byte, hash crypto.Hash) error {
digest := hash.New()
digest.Write(content)
digestSum := digest.Sum(sig[len(sig):])
for _, key := range reg.RSAs {
if err := rsa.VerifyPKCS1v15(key, hash, digestSum, sig); err == nil {
return nil
}
}
return ErrSigMiss
}
} else if err != ErrAlgUnk {
return nil, err
} else if hash, err = header.match(ECDSAAlgs); err == nil {
verifySig = func(content, sig []byte, hash crypto.Hash) error {
r := big.NewInt(0).SetBytes(sig[:len(sig)/2])
s := big.NewInt(0).SetBytes(sig[len(sig)/2:])
digest := hash.New()
digest.Write(content)
digestSum := digest.Sum(sig[:0])
for _, key := range reg.ECDSAs {
if ecdsa.Verify(key, digestSum, r, s) {
return nil
}
}
return ErrSigMiss
}
} else {
return nil, err
}
claims, err := verifyAndParseClaims(token, buf, hash, verifySig)
if err != nil {
return nil, err
}
claims.KeyID = header.Kid
return claims, nil
}
var errUnencryptedPEM = errors.New("jwt: unencrypted PEM rejected due password expectation")
// LoadPEM adds keys from PEM-encoded data and returns the count. PEM encryption
// is enforced for non-empty password values. The source may be certificates,
// public keys, private keys, or a combination of any of the previous. Private
// keys are discared after the (automatic) public key extraction completes.
func (r *KeyRegister) LoadPEM(data, password []byte) (n int, err error) {
for {
block, remainder := pem.Decode(data)
if block == nil {
return
}
data = remainder
if x509.IsEncryptedPEMBlock(block) {
block.Bytes, err = x509.DecryptPEMBlock(block, password)
if err != nil {
return
}
} else if len(password) != 0 {
return n, errUnencryptedPEM
}
switch block.Type {
case "CERTIFICATE":
certs, err := x509.ParseCertificates(block.Bytes)
if err != nil {
return n, err
}
for _, c := range certs {
if err := r.add(c.PublicKey); err != nil {
return n, err
}
}
case "PUBLIC KEY":
key, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
return n, err
}
if err := r.add(key); err != nil {
return n, err
}
case "EC PRIVATE KEY":
key, err := x509.ParseECPrivateKey(block.Bytes)
if err != nil {
return n, err
}
r.ECDSAs = append(r.ECDSAs, &key.PublicKey)
case "RSA PRIVATE KEY":
key, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return n, err
}
r.RSAs = append(r.RSAs, &key.PublicKey)
default:
return n, fmt.Errorf("jwt: unknown PEM type %q", block.Type)
}
n++
}
}
func (r *KeyRegister) add(key interface{}) error {
switch t := key.(type) {
case *ecdsa.PublicKey:
r.ECDSAs = append(r.ECDSAs, t)
case *rsa.PublicKey:
r.RSAs = append(r.RSAs, t)
default:
return fmt.Errorf("jwt: unsupported key type %T", t)
}
return nil
}