java - BouncycaSTLe openpgp:如何创建具有两个用户ID的PGP key 对？

使用命令行gnupg，我可以为“John Doe ”创建带有RSA密钥的密钥环。我还可以使用--edit-key和adduid使用uid“Jane Doe ”添加另一个用户。生成的secring.gpg如下所示:

$ gpg -vv secring.gpg
:secret key packet:
        version 4, algo 1, created 1380898817, expires 0
        skey[0]: [2048 bits]
        skey[1]: [17 bits]
        iter+salt S2K, algo: 9, SHA1 protection, hash: 2, salt: 3825c4409323d7b0
        protect count: 65536 (96)
        protect IV:  ac f9 8d 4a b7 3a 5d 7c b2 3c 28 ff 82 6d 4c ef
        encrypted stuff follows
:user ID packet: "John Doe <[email protected]>"
:signature packet: algo 1, keyid 9991E2282A9906C7
        version 4, created 1380898818, md5len 0, sigclass 0x13
        digest algo 2, begin of digest bd 01
        hashed subpkt 2 len 4 (sig created 2013-10-04)
        hashed subpkt 27 len 1 (key flags: 03)
        hashed subpkt 11 len 5 (pref-sym-algos: 9 8 7 3 2)
        hashed subpkt 21 len 5 (pref-hash-algos: 8 2 9 10 11)
        hashed subpkt 22 len 3 (pref-zip-algos: 2 3 1)
        hashed subpkt 30 len 1 (features: 01)
        subpkt 16 len 8 (issuer key ID 9991E2282A9906C7)
        data: [2045 bits]
:trust packet: flag=00 sigcache=00
:user ID packet: "Jane Doe <[email protected]>"
:signature packet: algo 1, keyid 9991E2282A9906C7
        version 4, created 1380899570, md5len 0, sigclass 0x13
        digest algo 2, begin of digest 2f 50
        hashed subpkt 2 len 4 (sig created 2013-10-04)
        hashed subpkt 27 len 1 (key flags: 03)
        hashed subpkt 11 len 5 (pref-sym-algos: 9 8 7 3 2)
        hashed subpkt 21 len 5 (pref-hash-algos: 8 2 9 10 11)
        hashed subpkt 22 len 3 (pref-zip-algos: 2 3 1)
        hashed subpkt 30 len 1 (features: 01)
        hashed subpkt 23 len 1 (key server preferences: 80)
        subpkt 16 len 8 (issuer key ID 9991E2282A9906C7)
        data: [2047 bits]
:trust packet: flag=00 sigcache=00
sec  2048R/2A9906C7 2013-10-04 John Doe <[email protected]>
sig        2A9906C7 2013-10-04   [selfsig]
uid                            Jane Doe <[email protected]>
sig        2A9906C7 2013-10-04   [selfsig]

我想使用Bouncycastle在Java中创建相同的内容，从java.security.KeyPair开始，即具有如下签名:

public void createKeyRing(KeyPair keyPair, char[] pass, String[] ids)

其中pass是密码短语和ids = new String[] {"John Doe <[email protected]>", "Jane Doe <[email protected]>"}。我遵循this tutorial的代码行，其中代码的关键部分是:

PGPKeyRingGenerator keyRingGen =
    new PGPKeyRingGenerator(
        PGPSignature.POSITIVE_CERTIFICATION, rsakp_sign,
        id, sha1Calc, signhashgen.generate(), null,
        new BcPGPContentSignerBuilder(
            rsakp_sign.getPublicKey().getAlgorithm(),
            HashAlgorithmTags.SHA1),
        pske);

// Add our encryption subkey, together with its signature.
keyRingGen.addSubKey(rsakp_enc, enchashgen.generate(), null);

其中rsakp_sign和rsakp_enc分别是符号和加密密钥的RSA密钥对，而signhashgen和enchashgen是包含算法首选项等子分组的生成器。

只要我只为John创建密钥，一切就很好。但是，当我想添加Jane时，我遇到了一个问题:显然我无法使用addSubKey为Jane添加一个经过符号哈希化的密钥对。第一次天真尝试是这样的:

PGPSignatureGenerator sGen = new PGPSignatureGenerator(
  new BcPGPContentSignerBuilder(PGPPublicKey.RSA_SIGN, PGPUtil.SHA1));
sGen.init(PGPSignature.POSITIVE_CERTIFICATION, pgpPrivateKey);
PGPSignature certification = sGen.generateCertification("Jane Doe <[email protected]>", pgpPublicKey);

PGPPublicKey newKey = PGPPublicKey.addCertification(pgpPublicKey, "Jane Doe <[email protected]>", certification);

keyRingGen.addSubKey(new PGPKeyPair(newKey, pgpPrivateKey), enchashgen.generate(), null);

那只是什么都不做，没有其他条目显示在gpg --vv meeththedoes.asc中。

或者，我可以使用John的密钥环，提取密钥，然后添加Jane:

PGPSecretKeyRing keyRing = keyRingGen.generateSecretKeyRing();

PGPSecretKey pgpSecretKey = keyRing.getSecretKey();
BcPGPDigestCalculatorProvider calculatorProvider = new BcPGPDigestCalculatorProvider();
BcPBESecretKeyDecryptorBuilder decryptor = new BcPBESecretKeyDecryptorBuilder(calculatorProvider);
PGPPrivateKey pgpPrivateKey = pgpSecretKey.extractPrivateKey(decryptor.build(pass));
PGPPublicKey pgpPublicKey = pgpSecretKey.getPublicKey();

PGPSignatureGenerator    sGen = new PGPSignatureGenerator(
  new BcPGPContentSignerBuilder(PGPPublicKey.RSA_SIGN, PGPUtil.SHA1));
sGen.init(PGPSignature.POSITIVE_CERTIFICATION, pgpPrivateKey);
PGPSignature certification = sGen.generateCertification("Jane Doe <[email protected]>", pgpPublicKey);

PGPPublicKey newKey = PGPPublicKey.addCertification(pgpPublicKey, "Jane Doe <[email protected]>", certification);

pgpSecretKey = PGPSecretKey.replacePublicKey(pgpSecretKey, newKey);

这种方法是可行的，但是在生成的钥匙圈中，John和Jane具有不同的子分组集:

$ gpg -vv meetthedoes.asc
gpg: ASCII-Hülle: BEGIN PGP PRIVATE KEY BLOCK
gpg: ASCII-Hülle: Version: BCPG v1.48
:secret key packet:
        version 4, algo 3, created 1380908986, expires 0
        skey[0]: [2048 bits]
        skey[1]: [17 bits]
        iter+salt S2K, algo: 9, SHA1 protection, hash: 2, salt: 696d2d42bd6b727c
        protect count: 65536 (96)
        protect IV:  87 31 81 df 17 fa 74 c4 c3 35 39 26 98 c1 15 27
        encrypted stuff follows
:user ID packet: "John Doe <[email protected]>"
:signature packet: algo 3, keyid 3A80073198CF2010
        version 4, created 1380908986, md5len 0, sigclass 0x13
        digest algo 2, begin of digest a5 c8
        hashed subpkt 2 len 4 (sig created 2013-10-04)
        hashed subpkt 27 len 1 (key flags: 03)
        hashed subpkt 11 len 5 (pref-sym-algos: 9 8 7 3 2)
        hashed subpkt 21 len 5 (pref-hash-algos: 8 2 9 10 11)
        hashed subpkt 22 len 3 (pref-zip-algos: 2 3 1)
        hashed subpkt 30 len 1 (features: 01)
        subpkt 16 len 8 (issuer key ID 3A80073198CF2010)
        data: [2047 bits]
:user ID packet: "Jane Doe <[email protected]>"
:signature packet: algo 3, keyid 3A80073198CF2010
        version 4, created 1380908986, md5len 0, sigclass 0x13
        digest algo 2, begin of digest f6 e8
        hashed subpkt 2 len 4 (sig created 2013-10-04)
        subpkt 16 len 8 (issuer key ID 3A80073198CF2010)
        data: [2039 bits]
sec  2048s/98CF2010 2013-10-04 John Doe <[email protected]>
sig        98CF2010 2013-10-04   [selfsig]
uid                            Jane Doe <[email protected]>
sig        98CF2010 2013-10-04   [selfsig]

我可能不想要的，对吗？无论如何，该方法似乎也是错误的。我是否应该能够首先完全检测生成器，然后让Bouncycastle一口气生成密钥集文件？我在这里做错了什么？

最佳答案

该API显然在添加第一个和后续uid之间有所不同。对于约翰，我可以说

PGPKeyRingGenerator generator = new PGPKeyRingGenerator(
  PGPSignature.POSITIVE_CERTIFICATION,
  signKeyPair, john, sha1Calc,
  signhashgen.generate(), null,
  new BcPGPContentSignerBuilder(
    signKeyPair.getPublicKey().getAlgorithm(),
    HashAlgorithmTags.SHA1),
    new BcPBESecretKeyEncryptorBuilder(PGPEncryptedData.AES_256).build(pass)
);
generator.addSubKey(encKeyPair, enchashgen.generate(), null);
PGPSecretKeyRing ring = generator.generateSecretKeyRing();

并使用gnupgp的方式创建带有签名密钥和加密子密钥的密钥环。但是对于Jane来说，这是行不通的，因为携带有关其子项信息的signhashgen并不是addSubKey的参数。相反，我可以从环中提取John的秘密密钥，从中创建一个PGPPrivateKey并使用它来签名Jane的uid。

PGPSignatureGenerator generator = new PGPSignatureGenerator(new BcPGPContentSignerBuilder(PGPPublicKey.RSA_GENERAL,
  PGPUtil.SHA1));
generator.init(PGPSignature.POSITIVE_CERTIFICATION, johnsPrivateKey);
PGPSignatureSubpacketGenerator signhashgen = copyJohnsSignhashgen();
generator.setHashedSubpackets(signhashgen.generate());
PGPSignature certification = generator.generateCertification(jane, getEncryptionKey(secretKeyRing));
PGPPublicKey janesKey = PGPPublicKey.addCertification(getEncryptionKey(secretKeyRing), jane, certification);

剩下要做的就是将新密钥添加到密钥环。