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67 lines
1.4 KiB
67 lines
1.4 KiB
package jwt
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import (
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"crypto/ecdsa"
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"crypto/x509"
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"encoding/pem"
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"errors"
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)
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var (
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ErrNotECPublicKey = errors.New("Key is not a valid ECDSA public key")
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ErrNotECPrivateKey = errors.New("Key is not a valid ECDSA private key")
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)
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// Parse PEM encoded Elliptic Curve Private Key Structure
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func ParseECPrivateKeyFromPEM(key []byte) (*ecdsa.PrivateKey, error) {
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var err error
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// Parse PEM block
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var block *pem.Block
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if block, _ = pem.Decode(key); block == nil {
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return nil, ErrKeyMustBePEMEncoded
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}
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// Parse the key
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var parsedKey interface{}
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if parsedKey, err = x509.ParseECPrivateKey(block.Bytes); err != nil {
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return nil, err
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}
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var pkey *ecdsa.PrivateKey
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var ok bool
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if pkey, ok = parsedKey.(*ecdsa.PrivateKey); !ok {
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return nil, ErrNotECPrivateKey
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}
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return pkey, nil
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}
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// Parse PEM encoded PKCS1 or PKCS8 public key
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func ParseECPublicKeyFromPEM(key []byte) (*ecdsa.PublicKey, error) {
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var err error
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// Parse PEM block
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var block *pem.Block
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if block, _ = pem.Decode(key); block == nil {
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return nil, ErrKeyMustBePEMEncoded
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}
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// Parse the key
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var parsedKey interface{}
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if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err != nil {
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if cert, err := x509.ParseCertificate(block.Bytes); err == nil {
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parsedKey = cert.PublicKey
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} else {
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return nil, err
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}
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}
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var pkey *ecdsa.PublicKey
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var ok bool
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if pkey, ok = parsedKey.(*ecdsa.PublicKey); !ok {
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return nil, ErrNotECPublicKey
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}
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return pkey, nil
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}
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