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sm: Support decryption of password based encryption (pwri)

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* sm/decrypt.c (string_from_gcry_buffer): New.
(pwri_parse_pbkdf2): New.
(pwri_decrypt): New.
(prepare_decryption): Support pwri.
(gpgsm_decrypt): Test for PWRI.  Move IS_DE_VS flag to DFPARM.

* common/sexputil.c (cipher_mode_to_string): New.
--

Note that this is not finished because we need to implement a password
callback.  For now "abc" is used as passwort.

Latest libksba is also required to return the required info.

Signed-off-by: Werner Koch <wk@gnupg.org>
Backported-from-master: 02029f9eab

Note that this change also prints the used algorithm and shows some
existsing diagnostics only in verbose mode.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2021-05-14 18:53:44 +02:00
parent b6f8cd7eef
commit 6f31acac76
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3 changed files with 493 additions and 57 deletions
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16
common/sexputil.c
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@ -1170,3 +1170,19 @@ hash_algo_to_string (int algo)
return hashnames[i].name;
return "?";
}
/* Map cipher modes to a string. */
const char *
cipher_mode_to_string (int mode)
{
switch (mode)
{
case GCRY_CIPHER_MODE_CFB: return "CFB";
case GCRY_CIPHER_MODE_CBC: return "CBC";
case GCRY_CIPHER_MODE_GCM: return "GCM";
case GCRY_CIPHER_MODE_OCB: return "OCB";
case 14: return "EAX"; /* Only in gcrypt 1.9 */
default: return "[?]";
}
}