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// Copyright 2021 The age Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package age
import (
"bufio"
"fmt"
"io"
"strings"
)
// ParseIdentities parses a file with one or more private key encodings, one per
// line. Empty lines and lines starting with "#" are ignored.
//
// This is the same syntax as the private key files accepted by the CLI, except
// the CLI also accepts SSH private keys, which are not recommended for the
// average application.
//
// Currently, all returned values are of type *X25519Identity, but different
// types might be returned in the future.
func ParseIdentities(f io.Reader) ([]Identity, error) {
const privateKeySizeLimit = 1 << 24 // 16 MiB
var ids []Identity
scanner := bufio.NewScanner(io.LimitReader(f, privateKeySizeLimit))
var n int
for scanner.Scan() {
n++
line := scanner.Text()
if strings.HasPrefix(line, "#") || line == "" {
continue
}
i, err := ParseX25519Identity(line)
if err != nil {
return nil, fmt.Errorf("error at line %d: %v", n, err)
}
ids = append(ids, i)
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("failed to read secret keys file: %v", err)
}
if len(ids) == 0 {
return nil, fmt.Errorf("no secret keys found")
}
return ids, nil
}
// ParseRecipients parses a file with one or more public key encodings, one per
// line. Empty lines and lines starting with "#" are ignored.
//
// This is the same syntax as the recipients files accepted by the CLI, except
// the CLI also accepts SSH recipients, which are not recommended for the
// average application.
//
// Currently, all returned values are of type *X25519Recipient, but different
// types might be returned in the future.
func ParseRecipients(f io.Reader) ([]Recipient, error) {
const recipientFileSizeLimit = 1 << 24 // 16 MiB
var recs []Recipient
scanner := bufio.NewScanner(io.LimitReader(f, recipientFileSizeLimit))
var n int
for scanner.Scan() {
n++
line := scanner.Text()
if strings.HasPrefix(line, "#") || line == "" {
continue
}
r, err := ParseX25519Recipient(line)
if err != nil {
// Hide the error since it might unintentionally leak the contents
// of confidential files.
return nil, fmt.Errorf("malformed recipient at line %d", n)
}
recs = append(recs, r)
}
if err := scanner.Err(); err != nil {
return nil, fmt.Errorf("failed to read recipients file: %v", err)
}
if len(recs) == 0 {
return nil, fmt.Errorf("no recipients found")
}
return recs, nil
}
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