cf186a4120
Allow ACME account keys to be configured via config file to maintain the same Let's Encrypt account across deployments. Add DecodePrivateKey function with PEM block type constants to support EC, RSA, and PKCS8 key formats. When no account key is provided, fall back to generating a new one with a warning. Signed-off-by: Bryan Frimin <bryan@getprobo.com>
109 lines
2.9 KiB
Go
109 lines
2.9 KiB
Go
// Copyright (c) 2025 Probo Inc <hello@getprobo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package pem
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/ed25519"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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)
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const (
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BlockTypeCertificate = "CERTIFICATE"
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BlockTypeECPrivateKey = "EC PRIVATE KEY"
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BlockTypeRSAPrivateKey = "RSA PRIVATE KEY"
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BlockTypePKCS8PrivateKey = "PRIVATE KEY"
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)
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func EncodeCertificate(der []byte) []byte {
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block := &pem.Block{
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Type: BlockTypeCertificate,
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Bytes: der,
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}
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return pem.EncodeToMemory(block)
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}
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func EncodeCertificateChain(derCerts [][]byte) []byte {
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var chain []byte
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for _, der := range derCerts {
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chain = append(chain, EncodeCertificate(der)...)
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}
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return chain
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}
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func EncodePrivateKey(key crypto.Signer) ([]byte, error) {
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var keyDER []byte
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var keyType string
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switch k := key.(type) {
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case *ecdsa.PrivateKey:
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der, err := x509.MarshalECPrivateKey(k)
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if err != nil {
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return nil, fmt.Errorf("cannot marshal EC private key: %w", err)
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}
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keyDER = der
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keyType = BlockTypeECPrivateKey
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case *rsa.PrivateKey:
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keyDER = x509.MarshalPKCS1PrivateKey(k)
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keyType = BlockTypeRSAPrivateKey
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case ed25519.PrivateKey:
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der, err := x509.MarshalPKCS8PrivateKey(k)
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if err != nil {
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return nil, fmt.Errorf("cannot marshal ED25519 private key: %w", err)
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}
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keyDER = der
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keyType = BlockTypePKCS8PrivateKey
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default:
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return nil, fmt.Errorf("unsupported key type: %T", key)
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}
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block := &pem.Block{
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Type: keyType,
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Bytes: keyDER,
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}
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return pem.EncodeToMemory(block), nil
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}
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func DecodePrivateKey(pemData []byte) (crypto.Signer, error) {
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block, _ := pem.Decode(pemData)
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if block == nil {
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return nil, fmt.Errorf("cannot to decode PEM block")
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}
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switch block.Type {
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case BlockTypeECPrivateKey:
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return x509.ParseECPrivateKey(block.Bytes)
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case BlockTypeRSAPrivateKey:
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return x509.ParsePKCS1PrivateKey(block.Bytes)
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case BlockTypePKCS8PrivateKey:
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key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
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if err != nil {
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return nil, fmt.Errorf("cannot parse PKCS8 private key: %w", err)
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}
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signer, ok := key.(crypto.Signer)
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if !ok {
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return nil, fmt.Errorf("key is not a crypto.Signer")
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}
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return signer, nil
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default:
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return nil, fmt.Errorf("unsupported PEM block type: %s", block.Type)
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}
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}
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