BouncyCastle-GPG。从密钥中提取 Public 密钥

BouncyCastle - GPG. Extract Public Key from Secret Key

我正在使用此 java 代码从密钥中提取 public 密钥:

PGPSecretKeyRingCollection ring = new PGPSecretKeyRingCollection(decoderStream,
            new JcaKeyFingerprintCalculator());
Iterator<PGPSecretKeyRing> it = ring.getKeyRings();
while (it.hasNext()) {
    PGPSecretKeyRing key = it.next();
    Iterator<PGPPublicKey> itpublic = key.getPublicKeys();
    while (itpublic.hasNext()) {
        PGPPublicKey pubKey = itpublic.next();
        // use this pubKey
    }
}

如果我尝试在 ArmoredOutputStream 中导出该密钥,我会得到如下内容:

    -----BEGIN PGP PUBLIC KEY BLOCK-----
    Version: BCPG v1.66
    
    hQEMA6GfAr1vmvVrAQf/XF/6DqSxZu0dXXVnhfxoot+YTLBrwnec/af72R8G1aJI
    [...]
    =eLkg
    -----END PGP PUBLIC KEY BLOCK-----

如果我使用此密钥从 java 代码加密某些内容,一切正常。

如果我使用此密钥从命令行(或 Kleopatra 等其他客户端)加密文件:

$ gpg --import pubKey.gpg
$ gpg --encrypt ...

我收到“无法使用 public 密钥”错误。

我从 java 代码导出的 public 密钥有问题吗?

您必须使用所有的 PublicKeyRing,而不仅仅是主 public 密钥:

List<PGPPublicKey> list = new ArrayList<>();
Iterator<PGPSecretKeyRing> it = ring.getKeyRings();
while (it.hasNext()) {
    PGPSecretKeyRing secretRing = it.next();
    Iterator<PGPPublicKey> itpublic = secretRing.getPublicKeys();
    while (itpublic.hasNext()) {
        PGPPublicKey pub = itpublic.next();
        list.add(pub);
    }
    Iterator<PGPPublicKey> itextrapublic = secretRing.getExtraPublicKeys();
    while (itextrapublic.hasNext()) {
        PGPPublicKey pub = itextrapublic.next();
        list.add(pub);
    }
}
PGPPublicKeyRing publicRing = new PGPPublicKeyRing(list);
publicRing.encode(armoredOutputStream)