254 lines
8.1 KiB
Go
254 lines
8.1 KiB
Go
package libtrust
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/rsa"
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"crypto/x509"
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"encoding/json"
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"encoding/pem"
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"errors"
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"fmt"
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"io"
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)
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// PublicKey is a generic interface for a Public Key.
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type PublicKey interface {
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// KeyType returns the key type for this key. For elliptic curve keys,
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// this value should be "EC". For RSA keys, this value should be "RSA".
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KeyType() string
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// KeyID returns a distinct identifier which is unique to this Public Key.
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// The format generated by this library is a base32 encoding of a 240 bit
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// hash of the public key data divided into 12 groups like so:
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// ABCD:EFGH:IJKL:MNOP:QRST:UVWX:YZ23:4567:ABCD:EFGH:IJKL:MNOP
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KeyID() string
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// Verify verifyies the signature of the data in the io.Reader using this
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// Public Key. The alg parameter should identify the digital signature
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// algorithm which was used to produce the signature and should be
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// supported by this public key. Returns a nil error if the signature
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// is valid.
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Verify(data io.Reader, alg string, signature []byte) error
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// CryptoPublicKey returns the internal object which can be used as a
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// crypto.PublicKey for use with other standard library operations. The type
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// is either *rsa.PublicKey or *ecdsa.PublicKey
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CryptoPublicKey() crypto.PublicKey
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// These public keys can be serialized to the standard JSON encoding for
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// JSON Web Keys. See section 6 of the IETF draft RFC for JOSE JSON Web
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// Algorithms.
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MarshalJSON() ([]byte, error)
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// These keys can also be serialized to the standard PEM encoding.
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PEMBlock() (*pem.Block, error)
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// The string representation of a key is its key type and ID.
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String() string
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AddExtendedField(string, interface{})
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GetExtendedField(string) interface{}
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}
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// PrivateKey is a generic interface for a Private Key.
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type PrivateKey interface {
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// A PrivateKey contains all fields and methods of a PublicKey of the
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// same type. The MarshalJSON method also outputs the private key as a
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// JSON Web Key, and the PEMBlock method outputs the private key as a
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// PEM block.
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PublicKey
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// PublicKey returns the PublicKey associated with this PrivateKey.
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PublicKey() PublicKey
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// Sign signs the data read from the io.Reader using a signature algorithm
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// supported by the private key. If the specified hashing algorithm is
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// supported by this key, that hash function is used to generate the
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// signature otherwise the the default hashing algorithm for this key is
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// used. Returns the signature and identifier of the algorithm used.
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Sign(data io.Reader, hashID crypto.Hash) (signature []byte, alg string, err error)
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// CryptoPrivateKey returns the internal object which can be used as a
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// crypto.PublicKey for use with other standard library operations. The
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// type is either *rsa.PublicKey or *ecdsa.PublicKey
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CryptoPrivateKey() crypto.PrivateKey
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}
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// FromCryptoPublicKey returns a libtrust PublicKey representation of the given
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// *ecdsa.PublicKey or *rsa.PublicKey. Returns a non-nil error when the given
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// key is of an unsupported type.
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func FromCryptoPublicKey(cryptoPublicKey crypto.PublicKey) (PublicKey, error) {
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switch cryptoPublicKey := cryptoPublicKey.(type) {
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case *ecdsa.PublicKey:
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return fromECPublicKey(cryptoPublicKey)
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case *rsa.PublicKey:
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return fromRSAPublicKey(cryptoPublicKey), nil
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default:
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return nil, fmt.Errorf("public key type %T is not supported", cryptoPublicKey)
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}
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}
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// FromCryptoPrivateKey returns a libtrust PrivateKey representation of the given
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// *ecdsa.PrivateKey or *rsa.PrivateKey. Returns a non-nil error when the given
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// key is of an unsupported type.
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func FromCryptoPrivateKey(cryptoPrivateKey crypto.PrivateKey) (PrivateKey, error) {
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switch cryptoPrivateKey := cryptoPrivateKey.(type) {
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case *ecdsa.PrivateKey:
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return fromECPrivateKey(cryptoPrivateKey)
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case *rsa.PrivateKey:
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return fromRSAPrivateKey(cryptoPrivateKey), nil
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default:
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return nil, fmt.Errorf("private key type %T is not supported", cryptoPrivateKey)
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}
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}
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// UnmarshalPublicKeyPEM parses the PEM encoded data and returns a libtrust
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// PublicKey or an error if there is a problem with the encoding.
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func UnmarshalPublicKeyPEM(data []byte) (PublicKey, error) {
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pemBlock, _ := pem.Decode(data)
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if pemBlock == nil {
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return nil, errors.New("unable to find PEM encoded data")
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} else if pemBlock.Type != "PUBLIC KEY" {
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return nil, fmt.Errorf("unable to get PublicKey from PEM type: %s", pemBlock.Type)
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}
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return pubKeyFromPEMBlock(pemBlock)
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}
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// UnmarshalPublicKeyPEMBundle parses the PEM encoded data as a bundle of
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// PEM blocks appended one after the other and returns a slice of PublicKey
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// objects that it finds.
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func UnmarshalPublicKeyPEMBundle(data []byte) ([]PublicKey, error) {
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pubKeys := []PublicKey{}
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for {
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var pemBlock *pem.Block
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pemBlock, data = pem.Decode(data)
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if pemBlock == nil {
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break
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} else if pemBlock.Type != "PUBLIC KEY" {
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return nil, fmt.Errorf("unable to get PublicKey from PEM type: %s", pemBlock.Type)
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}
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pubKey, err := pubKeyFromPEMBlock(pemBlock)
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if err != nil {
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return nil, err
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}
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pubKeys = append(pubKeys, pubKey)
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}
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return pubKeys, nil
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}
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// UnmarshalPrivateKeyPEM parses the PEM encoded data and returns a libtrust
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// PrivateKey or an error if there is a problem with the encoding.
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func UnmarshalPrivateKeyPEM(data []byte) (PrivateKey, error) {
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pemBlock, _ := pem.Decode(data)
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if pemBlock == nil {
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return nil, errors.New("unable to find PEM encoded data")
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}
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var key PrivateKey
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switch {
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case pemBlock.Type == "RSA PRIVATE KEY":
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rsaPrivateKey, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes)
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if err != nil {
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return nil, fmt.Errorf("unable to decode RSA Private Key PEM data: %s", err)
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}
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key = fromRSAPrivateKey(rsaPrivateKey)
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case pemBlock.Type == "EC PRIVATE KEY":
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ecPrivateKey, err := x509.ParseECPrivateKey(pemBlock.Bytes)
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if err != nil {
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return nil, fmt.Errorf("unable to decode EC Private Key PEM data: %s", err)
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}
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key, err = fromECPrivateKey(ecPrivateKey)
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("unable to get PrivateKey from PEM type: %s", pemBlock.Type)
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}
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addPEMHeadersToKey(pemBlock, key.PublicKey())
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return key, nil
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}
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// UnmarshalPublicKeyJWK unmarshals the given JSON Web Key into a generic
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// Public Key to be used with libtrust.
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func UnmarshalPublicKeyJWK(data []byte) (PublicKey, error) {
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jwk := make(map[string]interface{})
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err := json.Unmarshal(data, &jwk)
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if err != nil {
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return nil, fmt.Errorf(
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"decoding JWK Public Key JSON data: %s\n", err,
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)
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}
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// Get the Key Type value.
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kty, err := stringFromMap(jwk, "kty")
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if err != nil {
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return nil, fmt.Errorf("JWK Public Key type: %s", err)
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}
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switch {
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case kty == "EC":
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// Call out to unmarshal EC public key.
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return ecPublicKeyFromMap(jwk)
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case kty == "RSA":
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// Call out to unmarshal RSA public key.
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return rsaPublicKeyFromMap(jwk)
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default:
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return nil, fmt.Errorf(
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"JWK Public Key type not supported: %q\n", kty,
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)
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}
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}
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// UnmarshalPublicKeyJWKSet parses the JSON encoded data as a JSON Web Key Set
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// and returns a slice of Public Key objects.
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func UnmarshalPublicKeyJWKSet(data []byte) ([]PublicKey, error) {
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rawKeys, err := loadJSONKeySetRaw(data)
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if err != nil {
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return nil, err
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}
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pubKeys := make([]PublicKey, 0, len(rawKeys))
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for _, rawKey := range rawKeys {
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pubKey, err := UnmarshalPublicKeyJWK(rawKey)
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if err != nil {
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return nil, err
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}
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pubKeys = append(pubKeys, pubKey)
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}
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return pubKeys, nil
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}
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// UnmarshalPrivateKeyJWK unmarshals the given JSON Web Key into a generic
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// Private Key to be used with libtrust.
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func UnmarshalPrivateKeyJWK(data []byte) (PrivateKey, error) {
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jwk := make(map[string]interface{})
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err := json.Unmarshal(data, &jwk)
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if err != nil {
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return nil, fmt.Errorf(
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"decoding JWK Private Key JSON data: %s\n", err,
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)
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}
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// Get the Key Type value.
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kty, err := stringFromMap(jwk, "kty")
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if err != nil {
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return nil, fmt.Errorf("JWK Private Key type: %s", err)
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}
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switch {
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case kty == "EC":
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// Call out to unmarshal EC private key.
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return ecPrivateKeyFromMap(jwk)
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case kty == "RSA":
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// Call out to unmarshal RSA private key.
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return rsaPrivateKeyFromMap(jwk)
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default:
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return nil, fmt.Errorf(
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"JWK Private Key type not supported: %q\n", kty,
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)
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}
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}
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