70 lines
1.6 KiB
Go
70 lines
1.6 KiB
Go
package jwtutils
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import (
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"crypto/ecdsa"
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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("key must be PEM encoded")
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errNotRSAPublicKey = errors.New("key is not a valid RSA public key")
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errNotECDSAPublicKey = errors.New("key is not a valid ECDSA public key")
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)
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// ParseRSAPublicKeyFromPEM parses 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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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 any
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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, errNotRSAPublicKey
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}
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return pkey, nil
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}
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// ParseECDSAPublicKeyFromPEM parses PEM encoded public key.
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func ParseECDSAPublicKeyFromPEM(key []byte) (*ecdsa.PublicKey, error) {
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var err error
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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 any
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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, errNotECDSAPublicKey
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}
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return pkey, nil
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}
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