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g10: Allow receiving cleartext secret keys from agent

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* g10/export.c (match_curve_skey_pk): New function, testing whether an
OpenPGP public key and an S-expression use the same curve.
* g10/export.c (cleartext_secret_key_to_openpgp): New function,
filling in the secret key parameters of a PKT_public_key object from
a corresponding cleartext S-expression.
* g10/export.c, g10/main.h (receive_seckey_from_agent): Add cleartext
parameter, enabling retrieval of the secret key, unlocked.
* g10/export.c (do_export_stream): Send cleartext as 0, keeping current
behavior.
* g10/keygen.c (card_store_key_with_backup): Use cleartext=0 to ensure
that smartcard backups are all passphrase-locked.
--

This sets up internal functionality to be capable of exporting
cleartext secret keys, but does not change any existing behavior.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
This commit is contained in:
Daniel Kahn Gillmor 2016-06-10 16:15:35 -04:00 • committed by Werner Koch
parent 7de7432076
commit a3cb72af79
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GPG key ID: E3FDFF218E45B72B
3 changed files with 223 additions and 4 deletions
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g10/main.h
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@ -389,6 +389,7 @@ gpg_error_t export_pubkey_buffer (ctrl_t ctrl, const char *keyspec,
void **r_data, size_t *r_datalen);
gpg_error_t receive_seckey_from_agent (ctrl_t ctrl, gcry_cipher_hd_t cipherhd,
int cleartext,
char **cache_nonce_addr, const char *hexgrip,
PKT_public_key *pk);