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sm: Support AES-GCM decryption.

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* tests/cms/samplemsgs/: Add sample messages.
* sm/gpgsm.c (main): Use gpgrt_fcancel on decryption error.
* sm/decrypt.c (decrypt_gcm_filter): New.
(gpgsm_decrypt): Use this filter if requested.  Check authtag.
--

Note that the sample message pwri-sample.gcm.p7m is broken: The
authtag is duplicated to the authEncryptedContentInfo.  I used a
temporary code during testing hack to that test message out.
This commit is contained in:
Werner Koch 2021-06-02 11:03:55 +02:00
parent a8209b001c
commit 4980fb3c6d
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
8 changed files with 96 additions and 7 deletions
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doc/DETAILS
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@ -1665,6 +1665,8 @@ Description of some debug flags:
** List of useful RFCs
- RFC-3447 :: PKCS #1: RSA Cryptography Specifications Version 2.1
- RFC-4880 :: OpenPGP
- RFC-5083 :: CMS - Authenticated-Enveloped-Data
- RFC-5084 :: CMS - AES-GCM
- RFC-5280 :: X.509 PKI Certificate and CRL Profile
- RFC-5652 :: CMS (STD0070)
- RFC-6818 :: Updates to the X.509 PKI Certificate and CRL Profile