使用gpgme（gpg / gnupg的开发库），我试图签署一些数据。 在密钥环中，我有超过1个私钥，所以我想选择 纠正一个。 这失败了：＆＃34; Unusable secret key（117440566）＆＃34;。 密钥是用gnupg2本身生成的。使用gnupg时也会出现问题。
sec 1024R/14B7E8E6 2015-05-27
Key fingerprint = 95C7 6C5E F839 43DA 2F32 2CF4 D2C2 5144 14B7 E8E6
uid testkey2 (testkey2) <test@vanheusden.com>
ssb 1024R/ED8059EA 2015-05-27
pub rsa1024/14B7E8E6
created: 2015-05-27 expires: never usage: SC
trust: ultimate validity: ultimate
sub rsa1024/ED8059EA
created: 2015-05-27 expires: never usage: E
sub rsa1024/74D6F5C6
created: 2015-05-31 expires: never usage: S
首先，我检查是否有所选密钥的私钥：
gpgme_op_keylist_start(..., ..., 1);
if (gpgme_op_keylist_nex() == GPG_ERR_NO_ERROR) { proceed }
签名：
gpgme_new()
gpgme_set_pinentry_mode(GPGME_PINENTRY_MODE_LOOPBACK) // yes i installed v2.1
gpgme_set_passphrase_cb()
/* ...binary to gpgme_data_t... */
gpgme_data_set_encoding(GPGME_DATA_ENCODING_BINARY)
gpgme_signers_clear()
gpgme_signers_add() // <- that key that I checked for existance earlier
if (gpgme_signers_count() != 1) { fail(); } // sanity check
gpgme_op_encrypt_sign(ctx, recipient, GPGME_ENCRYPT_ALWAYS_TRUST /* FIXME */, data_in, sig);
现在gpgme_op_encrypt_sign总是以＃34; Unusable secret key（117440566）＆＃34;错误。 任何提示/提示？
软件版本：
gnupg 1.4.18-7
gnupg-agent 2.1.4-1
gnupg2 2.1.4-1
libgpgme++2 4:4.14.2-2+b1
libgpgme11:amd64 1.5.1-6
libgpgme11-dev 1.5.1-6
python-gnupginterface 0.3.2-9.1
我启用了调试跟踪，但它对我没什么帮助：
<0x1927> gpgme_debug: level=4
<0x1927> gpgme_check_version: call: 0=(nil), req_version=(null), VERSION=1.5.1
<0x1927> gpgme_check_version_internal: call: 0=(nil), req_version=(null), offset_sig_validity=60
<0x1927> gpgme_set_locale: enter: ctx=(nil), category=0, value=C
<0x1927> gpgme_set_locale: leave
<0x1927> gpgme_set_locale: enter: ctx=(nil), category=5, value=C
<0x1927> gpgme_set_locale: leave
<0x1927> gpgme-dinfo: gpgconf='/usr/bin/gpgconf'
<0x1927> gpgme-dinfo: gpg='/usr/bin/gpg2'
<0x1927> gpgme-dinfo: gpgsm='/usr/bin/gpgsm'
<0x1927> gpgme-dinfo: homedir='/home/folkert/.gnupg'
<0x1927> gpgme-dinfo: agent='/home/folkert/.gnupg/S.gpg-agent'
<0x1927> gpgme-dinfo: uisrv='/home/folkert/.gnupg/S.uiserver'
<0x1927> gpgme_new: enter: r_ctx=0x7fff5afd07a8
<0x1927> gpgme_new: leave: ctx=0x20c0810
<0x1927> gpgme_op_keylist_start: enter: ctx=0x20c0810, pattern=0BF38589, secret_only=1
<0x1927> _gpgme_add_io_cb: call: ctx=0x20c0810, fd 4, dir=1 -> tag=0x20c26b0
<0x1927> _gpgme_add_io_cb: call: ctx=0x20c0810, fd 6, dir=1 -> tag=0x20c2800
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c0c10, event 0x7fd8b1a20ad0, type 0, type_data (nil)
<0x1927> gpgme_op_keylist_start: leave
<0x1927> gpgme_op_keylist_next: enter: ctx=0x20c0810
<0x1927> _gpgme_run_io_cb: call: item=0x20c2820, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c2820, handler (0x20c0c10, 6)
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = (nil), line = sec:u:2048:1:CC73A8A60BF38589:1433443717:::u:::scESC::::::
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c2850, line = fpr:::::::::20CD3FF80DA6C1E46CD9F135CC73A8A60BF38589:
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c2850, line = uid:u::::1433443717::9963CFDE0C8920AD077B06A281992C4008E67E4F::testkey3 (testkey3) <test@vanheusden.com>:
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c2850, line = ssb:u:2048:1:22317805D48C1491:1433443717::::::e::::::
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c2850, line = fpr:::::::::FB6FFB7D8BEC710A745DE86C22317805D48C1491:
<0x1927> _gpgme_run_io_cb: call: item=0x20c26d0, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c26d0, handler (0x20c0c10, 4)
<0x1927> _gpgme_remove_io_cb: call: data=0x20c26b0, setting fd 0x4 (item=0x20c26d0) done
<0x1927> _gpgme_run_io_cb: call: item=0x20c2820, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c2820, handler (0x20c0c10, 6)
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c2850, line = (null)
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c0c10, event 0x7fd8b1a20ad0, type 2, type_data 0x20c2850
<0x1927> _gpgme_remove_io_cb: call: data=0x20c2800, setting fd 0x6 (item=0x20c2820) done
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c0c10, event 0x7fd8b1a20ad0, type 1, type_data 0x7fff5afd0700
<0x1927> gpgme_op_keylist_next: leave: key=0x20c2850 (20CD3FF80DA6C1E46CD9F135CC73A8A60BF38589)
<0x1927> gpgme_release: call: ctx=0x20c0810
<0x1927> gpgme_new: enter: r_ctx=0x7fff5afd0818
<0x1927> gpgme_new: leave: ctx=0x20c2210
<0x1927> gpgme_op_keylist_start: enter: ctx=0x20c2210, pattern=4BE78BDCF3F5352CF624A6DF3AD6F8118300CC02, secret_only=0
<0x1927> _gpgme_add_io_cb: call: ctx=0x20c2210, fd 4, dir=1 -> tag=0x20c1f50
<0x1927> _gpgme_add_io_cb: call: ctx=0x20c2210, fd 6, dir=1 -> tag=0x20c1fa0
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c0c10, event 0x7fd8b1a20ad0, type 0, type_data (nil)
<0x1927> gpgme_op_keylist_start: leave
<0x1927> gpgme_op_keylist_next: enter: ctx=0x20c2210
<0x1927> _gpgme_run_io_cb: call: item=0x20c1fc0, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c1fc0, handler (0x20c0c10, 6)
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c2210, key = (nil), line = tru::0:1433443869:2410285847:3:1:5
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c2210, key = (nil), line = pub:-:1024:17:3AD6F8118300CC02:1039074767:::-:::scESC::::::
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c2210, key = 0x20c2b70, line = fpr:::::::::4BE78BDCF3F5352CF624A6DF3AD6F8118300CC02:
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c2210, key = 0x20c2b70, line = uid:-::::1203999932::275AAD3E991F1962AD510CC96760907BE70FE668::Bla <bla@com>:
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c2210, key = 0x20c2b70, line = uid:-::::1203999938::59689891229F1817EF66BFC63D9D0BB2F45F5209::Bla <bla@com>:
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c2210, key = 0x20c2b70, line = uid:r::::::8A709552E7AB85B53DDAE18A48C0978E5EBF5547::Bla <bla@com>:
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c2210, key = 0x20c2b70, line = sub:-:2048:16:942E547C12A6B1C2:1039075030::::::e::::::
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c2210, key = 0x20c2b70, line = fpr:::::::::E69EF5226BBF7EC14F1D7D96942E547C12A6B1C2:
<0x1927> _gpgme_run_io_cb: call: item=0x20c1f70, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c1f70, handler (0x20c0c10, 4)
<0x1927> _gpgme_remove_io_cb: call: data=0x20c1f50, setting fd 0x4 (item=0x20c1f70) done
<0x1927> _gpgme_run_io_cb: call: item=0x20c1fc0, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c1fc0, handler (0x20c0c10, 6)
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c2210, key = 0x20c2b70, line = (null)
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c0c10, event 0x7fd8b1a20ad0, type 2, type_data 0x20c2b70
<0x1927> _gpgme_remove_io_cb: call: data=0x20c1fa0, setting fd 0x6 (item=0x20c1fc0) done
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c0c10, event 0x7fd8b1a20ad0, type 1, type_data 0x7fff5afd0760
<0x1927> gpgme_op_keylist_next: leave: key=0x20c2b70 (4BE78BDCF3F5352CF624A6DF3AD6F8118300CC02)
<0x1927> gpgme_release: call: ctx=0x20c2210
<0x1927> gpgme_new: enter: r_ctx=0x7fff5afd07c8
<0x1927> gpgme_new: leave: ctx=0x20c2550
<0x1927> gpgme_set_passphrase_cb: call: ctx=0x20c2550, passphrase_cb=(nil)/(nil)
<0x1927> gpgme_set_pinentry_mode: call: ctx=0x20c2550, pinentry_mode=4
<0x1927> gpgme_set_passphrase_cb: call: ctx=0x20c2550, passphrase_cb=0x403420/0x20c0058
<0x1927> gpgme_set_passphrase_cb: call: ctx=0x20c2550, passphrase_cb=0x403420/0x20c0058
<0x1927> gpgme_new: enter: r_ctx=0x7fff5afd0768
<0x1927> gpgme_new: leave: ctx=0x20c0810
<0x1927> gpgme_op_keylist_start: enter: ctx=0x20c0810, pattern=0BF38589, secret_only=0
<0x1927> _gpgme_add_io_cb: call: ctx=0x20c0810, fd 4, dir=1 -> tag=0x20c4fd0
<0x1927> _gpgme_add_io_cb: call: ctx=0x20c0810, fd 6, dir=1 -> tag=0x20c5120
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c1d50, event 0x7fd8b1a20ad0, type 0, type_data (nil)
<0x1927> gpgme_op_keylist_start: leave
<0x1927> gpgme_op_keylist_next: enter: ctx=0x20c0810
<0x1927> _gpgme_run_io_cb: call: item=0x20c5140, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c5140, handler (0x20c1d50, 6)
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = (nil), line = tru::0:1433443869:2410285847:3:1:5
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = (nil), line = pub:u:2048:1:CC73A8A60BF38589:1433443717:::u:::scESC::::::
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c5170, line = fpr:::::::::20CD3FF80DA6C1E46CD9F135CC73A8A60BF38589:
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c5170, line = uid:u::::1433443717::9963CFDE0C8920AD077B06A281992C4008E67E4F::testkey3 (testkey3) <test@vanheusden.com>:
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c5170, line = sub:u:2048:1:22317805D48C1491:1433443717::::::e::::::
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c5170, line = fpr:::::::::FB6FFB7D8BEC710A745DE86C22317805D48C1491:
<0x1927> _gpgme_run_io_cb: call: item=0x20c4ff0, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c4ff0, handler (0x20c1d50, 4)
<0x1927> _gpgme_remove_io_cb: call: data=0x20c4fd0, setting fd 0x4 (item=0x20c4ff0) done
<0x1927> _gpgme_run_io_cb: call: item=0x20c5140, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c5140, handler (0x20c1d50, 6)
<0x1927> gpgme:keylist_colon_handler: call: ctx=0x20c0810, key = 0x20c5170, line = (null)
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c1d50, event 0x7fd8b1a20ad0, type 2, type_data 0x20c5170
<0x1927> _gpgme_remove_io_cb: call: data=0x20c5120, setting fd 0x6 (item=0x20c5140) done
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c1d50, event 0x7fd8b1a20ad0, type 1, type_data 0x7fff5afd06c0
<0x1927> gpgme_op_keylist_next: leave: key=0x20c5170 (20CD3FF80DA6C1E46CD9F135CC73A8A60BF38589)
<0x1927> gpgme_release: call: ctx=0x20c0810
<0x1927> gpgme_signers_clear: call: ctx=0x20c2550
<0x1927> gpgme_signers_add: enter: ctx=0x20c2550, key=0x20c2850 (20CD3FF80DA6C1E46CD9F135CC73A8A60BF38589)
<0x1927> gpgme_signers_add: leave
<0x1927> gpgme_op_encrypt_sign: enter: ctx=0x20c2550, flags=0x1, plain=0x20c2ed0, cipher=0x20c3f20
<0x1927> gpgme_op_encrypt_sign: check: ctx=0x20c2550, recipient[0] = 0x20c5170 (20CD3FF80DA6C1E46CD9F135CC73A8A60BF38589)
<0x1927> gpgme_sig_notation_get: call: ctx=0x20c2550, ctx->sig_notations=(nil)
<0x1927> _gpgme_add_io_cb: call: ctx=0x20c2550, fd 4, dir=1 -> tag=0x20c2070
<0x1927> _gpgme_add_io_cb: call: ctx=0x20c2550, fd 8, dir=1 -> tag=0x20c21c0
<0x1927> _gpgme_add_io_cb: call: ctx=0x20c2550, fd 11, dir=0 -> tag=0x20c2210
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c1d50, event 0x7fd8b1a20ad0, type 0, type_data (nil)
<0x1927> _gpgme_run_io_cb: call: item=0x20c2230, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c2230, handler (0x20c2ed0, 11)
<0x1927> _gpgme_data_outbound_handler: enter: dh=0x20c2ed0, fd=0xb
<0x1927> _gpgme_data_outbound_handler: leave
<0x1927> _gpgme_run_io_cb: call: item=0x20c2230, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c2230, handler (0x20c2ed0, 11)
<0x1927> _gpgme_data_outbound_handler: enter: dh=0x20c2ed0, fd=0xb
<0x1927> _gpgme_remove_io_cb: call: data=0x20c2210, setting fd 0xb (item=0x20c2230) done
<0x1927> _gpgme_data_outbound_handler: leave
<0x1927> _gpgme_run_io_cb: call: item=0x20c2090, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c2090, handler (0x20c1d50, 4)
<0x1927> _gpgme_run_io_cb: call: item=0x20c2090, need to check
<0x1927> _gpgme_run_io_cb: call: item=0x20c2090, handler (0x20c1d50, 4)
<0x1927> _gpgme_cancel_with_err: enter: ctx=0x20c2550, ctx_err=117440566, op_err=0
<0x1927> _gpgme_remove_io_cb: call: data=0x20c2070, setting fd 0x4 (item=0x20c2090) done
<0x1927> _gpgme_remove_io_cb: call: data=0x20c21c0, setting fd 0x8 (item=0x20c21e0) done
<0x1927> gpgme:gpg_io_event: call: gpg=0x20c1d50, event 0x7fd8b1a20ad0, type 1, type_data 0x7fff5afd06c0
<0x1927> _gpgme_cancel_with_err: leave
<0x1927> gpgme_op_encrypt_sign: error: Unusable secret key <GPGME>
<0x1927> gpgme_release: call: ctx=0x20c2550
修改
根据@kylehuff的要求，这里是密钥选择的代码：
search_key_result_t gpgme::find_key(const std::string & key_id, const bool priv_key_only, gpgme_key_t *k, std::string *const error)
{
error -> clear();
*k = NULL;
gpgme_ctx_t ctx = NULL;
if (!my_gpgme_new(&ctx, false, error))
return SK_ERROR;
gpgme_error_t err = gpgme_op_keylist_start(ctx, key_id.c_str(), priv_key_only ? 1 : 0);
if (err != GPG_ERR_NO_ERROR)
{
error -> append(format("Problem searching for %s: %s (%d)", key_id.c_str(), gpg_strerror(err), err));
gpgme_release(ctx);
return SK_ERROR;
}
err = gpgme_op_keylist_next(ctx, k);
if (err == GPG_ERR_EOF)
return SK_NOT_FOUND;
if (err != GPG_ERR_NO_ERROR)
{
error -> append(format("Problem finding %s: %s (%d)", key_id.c_str(), gpg_strerror(err), err));
gpgme_release(ctx);
return SK_ERROR;
}
gpgme_release(ctx);
return SK_FOUND;
}
然后在构造函数中我做：
std::string error;
if (find_key(my_key_id, true, &my_key, &error) != SK_FOUND)
error_exit(false, "Cannot find key %s: %s", my_key_id.c_str(), error.c_str());
以及何时签署：
if (find_key(target_uid, false, &recipient[0], error) != SK_FOUND)
break;
gpgme_signers_clear(ctx);
err = gpgme_signers_add(ctx, my_key);
if (err != GPG_ERR_NO_ERROR)
{
error -> append(format("gpgme_signers_add(%s) failed: %s (%d)", my_key_id.c_str(), gpg_strerror(err), err));
break;
}
int n_signers = gpgme_signers_count(ctx);
if (n_signers != 1)
{
error -> append(format("Number of signers (%d) not expected number (1)", n_signers));
break;
}
err = gpgme_op_encrypt_sign(ctx, recipient, GPGME_ENCRYPT_ALWAYS_TRUST /* FIXME */, data_in, sig);
if (err != GPG_ERR_NO_ERROR)
{
error -> append(format("gpgme_op_encrypt failed: %s (%d)", gpg_strerror(err), err));
break;
}
@kylehuff，这是你要求的吗？ 感谢
修改
此处列出的是20CD3FF80DA6C1E46CD9F135CC73A8A60BF38589：
tru::0:1433443869:2410285847:3:1:5
pub:u:2048:1:CC73A8A60BF38589:2015-06-04:::u:testkey3 (testkey3) <test@vanheusden.com>::scESC:
sub:u:2048:1:22317805D48C1491:2015-06-04::::::e:
修改
folkert @ travelmate：〜$ gpg2 --local-user 14B7E8E6 --sign bla.txt
folkert @ travelmate：〜$ gpg --verify bla.txt.gpg gpg：签名于2015年6月18日星期五07:18:17 UTC使用RSA密钥ID 74D6F5C6 gpg：来自＆＃34; testkey2（testkey2）＆＃34;
的良好签名并且使用编辑键我可以看到74d6f5c6确实是符号子键：
sub 1024R / 74D6F5C6创建时间：2015-05-31到期：从不使用：S
所以我有点惊讶这对gpgme不起作用。 不做查找，但直接gpgme_get_key（）给出了同样的错误。
答案 0 :(得分：2)
即使有样本，很难说出发生了什么，但这里有几种可能的情况 -
方法my_gpgme_new(&ctx, false, error)中的某些事情可能是任性的。那个功能究竟在做什么？为什么不使用标准gpgme_new方法？
在提供的示例中，您使用的是函数search_key_result_t gpgme::find_key();是否需要多个签名者？如果是这样，至少为了测试，为什么不简化它并只使用gpgme_get_key()？即。
gpgme_error_t err;
gpgme_key_t key;
err = gpgme_get_key (ctx, key_string, &key, 1);
if (err) {
// .. error handling
}
gpgme_signers_clear();
err = gpgme_signers_add (ctx, key);
gpgme_key_unref (key);
int n_signers = gpgme_signers_count(ctx);
if (n_signers != 1) {
// .. error handling
}
err = gpgme_op_encrypt_sign(ctx, recipient, ....);
此外，使用该方法，您似乎将该方法添加到gpgme namesapce。是否有可能在gpgme命名空间中践踏内置方法？
对于收件人对象，它是如何构建的？它应该是gpgme_key_t的空终止gpgme_key_t结构，即使它只是一个收件人。即。
gpgme_key_t recipients[2] = { NULL, NULL };
err = gpgme_get_key (ctx, recipient_fpr.c_str(), &recipients[0], 0);
if (err) { // .. error handling }
或者，如果收件人以数组形式提供：
gpgme_key_t recipients = new gpgme_key_t[recip_array.size()];
err = gpgme_get_key (ctx, recipient_fpr.c_str(), &recipients[0], 0);
if (err) { // .. error handling }
recipients[recip_array.size()] = NULL; // null terminate the array