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Bouncycastle openpgpg:如何创建具有两个用户ID的PGP密钥对?

openpgp bouncycastle java
  •  3
  • wallenborn  · 技术社区  · 11 年前

    使用命令行gnupg i可以为“John Doe<john@doe.com>“。我还可以添加另一个具有uid”Jane Doe<jane@doe.com>“使用 --edit-key 和 adduid 生成的secring.jpg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 <john@doe.com>"
: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 <jane@doe.com>"
: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 <john@doe.com>
sig        2A9906C7 2013-10-04   [selfsig]
uid                            Jane Doe <jane@doe.com>
sig        2A9906C7 2013-10-04   [selfsig]

    我想在Java中使用Bouncycastle创建同样的东西,从Java.security.KeyPair开始,即使用这样的签名: 

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

    其中pass是密码短语 ids = new String[] {"John Doe <john@doe.com>", "Jane Doe <jane@doe.com>"} 。我遵循 this tutorial ,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分别是签名密钥和加密密钥的RSA密钥对,signhashgen和enchashgen是包含算法偏好等的子分组的生成器。

    只要我只为约翰创造一把钥匙,一切都很好。但当我想添加Jane时,我遇到了一个问题:显然我不能使用addSubKey为Jane添加一个signhashgen化的密钥对。第一次天真的尝试是这样的: 

    PGPSignatureGenerator sGen = new PGPSignatureGenerator(
  new BcPGPContentSignerBuilder(PGPPublicKey.RSA_SIGN, PGPUtil.SHA1));
sGen.init(PGPSignature.POSITIVE_CERTIFICATION, pgpPrivateKey);
PGPSignature certification = sGen.generateCertification("Jane Doe <jane@doe.com>", pgpPublicKey);

PGPPublicKey newKey = PGPPublicKey.addCertification(pgpPublicKey, "Jane Doe <jane@doe.com>", certification);

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

    这没有任何作用,没有其他条目显示在 gpg --vv meeththedoes.asc .

    或者,我可以拿走约翰的钥匙圈,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 <jane@doe.com>", pgpPublicKey);

PGPPublicKey newKey = PGPPublicKey.addCertification(pgpPublicKey, "Jane Doe <jane@doe.com>", certification);

pgpSecretKey = PGPSecretKey.replacePublicKey(pgpSecretKey, newKey);

    这有点奏效,但在最终的钥匙圈中,John和Jane有不同的子包: 

    $ 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 <john@doe.com>"
: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 <jane@doe.com>"
: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 <john@doe.com>
sig        98CF2010 2013-10-04   [selfsig]
uid                            Jane Doe <jane@doe.com>
sig        98CF2010 2013-10-04   [selfsig]

    我可能不想要,对吧?无论如何,这种方法似乎也是错误的。难道我不应该先完全安装生成器,然后让Bouncycastle一下子生成密钥环文件吗?我在这里做错了什么?

    1 回复  |  直到 11 年前
        1
  •  3
  •   wallenborn    11 年前

    API在添加第一个uid和随后的uid之间显然有所不同。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();

    这创建了一个带有签名密钥和加密子密钥的密钥环,就像gnuppp那样。但对Jane来说,这不起作用,因为携带子密钥信息的signhashgen不是addSubKey的参数。相反,我可以从戒指中提取John的密钥,从中创建一个PGPPrivateKey,并用它来签名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钥匙添加到钥匙圈中。

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