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"Unusable secret key" - any ideas?
https://forum.yubico.com/viewtopic.php?f=26&t=1819		 Page 1 of 1
Author:  yubibob [ Wed Apr 08, 2015 6:59 am ]
Post subject:  "Unusable secret key" - any ideas?
Hi Guys,
My Yubikey Neo is all set up working for encryption and decryption. However I can not get signatures to work. When I try, I get "Unusable secret key" error. Any clues?

Code:
$ gpg -s -v -u paul@xxxx.com test.txt
gpg: skipped "paul@xxxx.com": Unusable secret key
gpg: signing failed: Unusable secret key


The keys all look good:
Code:
Signature key ....: 45C1 5BC8 EAB1 4207 2E3B  9CDD 4993 xxxx 8AE8 xxxx
      created ....: 2015-04-07 17:18:26
Encryption key....: AB1F 31B2 1266 C8AF 06B9  780C A860 xxxx 4ABC xxxx
      created ....: 2015-04-07 17:17:33
Authentication key: 2B58 17B6 A7ED 7B2E 5304  747C F422 xxxx 94D0 xxxx
      created ....: 2015-04-07 17:18:43
General key info..: pub  2048R/8AE8xxxx 2015-04-07 Paul <paul@xxxx.com>
sec#  4096R/A00xxxx  created: 2015-04-07  expires: 2018-04-06
ssb>  2048R/4ABxxxx  created: 2015-04-07  expires: 2016-04-06
                      card-no: 0006 03027655
ssb>  2048R/8AE8xxxx  created: 2015-04-07  expires: 2016-04-06
                      card-no: 0006 03027655
ssb>  2048R/94D0xxxx  created: 2015-04-07  expires: 2016-04-06
                      card-no: 0006 03027655
Signature key ....: 45C1 5BC8 EAB1 4207 2E3B  9CDD 4993 7E87 8AE8 9765
      created ....: 2015-04-07 17:18:26
Encryption key....: AB1F 31B2 1266 C8AF 06B9  780C A860 927F 4ABC 7C0A
      created ....: 2015-04-07 17:17:33
Authentication key: 2B58 17B6 A7ED 7B2E 5304  747C F422 EEF1 94D0 7DB7
      created ....: 2015-04-07 17:18:43
General key info..: pub  2048R/8AE89765 2015-04-07 Paul <paul@xxxx.com>
sec#  4096R/A008087C  created: 2015-04-07  expires: 2018-04-06
ssb>  2048R/4ABC7C0A  created: 2015-04-07  expires: 2016-04-06
                      card-no: 0006 03027yyy
ssb>  2048R/8AE89765  created: 2015-04-07  expires: 2016-04-06
                      card-no: 0006 03027yyy
ssb>  2048R/94D07DB7  created: 2015-04-07  expires: 2016-04-06
                      card-no: 0006 03027yyy


Some more detail:

Code:
$gpg --debug 64 -s -u [email blocked] test.txt
gpg: reading options from `/Users/bob/.gnupg/gpg.conf'
gpg: enabled debug flags: cache
gpg: DBG: finish_lookup: checking key A008xxxC (all)(req_usage=0)
gpg: DBG:   using key A008087C
gpg: DBG: finish_lookup: checking key A008xxxC (all)(req_usage=1)
gpg: DBG:   primary key usage does not match: want=1 have=4
gpg: DBG:   no suitable key found -  giving up
gpg: skipped "[email blocked]": Unusable secret key
gpg: signing failed: Unusable secret key
secmem usage: 0/32768 bytes in 0 blocks
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