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68 lines
1.5 KiB
68 lines
1.5 KiB
package jwt
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import (
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"crypto/rsa"
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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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ErrKeyMustBePEMEncoded = errors.New("Invalid Key: Key must be PEM encoded PKCS1 or PKCS8 private key")
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ErrNotRSAPrivateKey = errors.New("Key is not a valid RSA private key")
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)
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// Parse PEM encoded PKCS1 or PKCS8 private key
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func ParseRSAPrivateKeyFromPEM(key []byte) (*rsa.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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var parsedKey interface{}
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if parsedKey, err = x509.ParsePKCS1PrivateKey(block.Bytes); err != nil {
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if parsedKey, err = x509.ParsePKCS8PrivateKey(block.Bytes); err != nil {
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return nil, err
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}
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}
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var pkey *rsa.PrivateKey
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var ok bool
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if pkey, ok = parsedKey.(*rsa.PrivateKey); !ok {
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return nil, ErrNotRSAPrivateKey
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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 ParseRSAPublicKeyFromPEM(key []byte) (*rsa.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 *rsa.PublicKey
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var ok bool
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if pkey, ok = parsedKey.(*rsa.PublicKey); !ok {
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return nil, ErrNotRSAPrivateKey
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}
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return pkey, nil
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}
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