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agent: Add initial support for hybrid ECC+PQC decryption with KEM.

Browse source 
* agent/agent.h (enum kemid): New.
(agent_kem_decrypt): New.
* agent/command.c (cmd_pkdecrypt): Support --kem option to call
agent_kem_decrypt.
* agent/pkdecrypt.c (reverse_buffer): New.
(agent_hybrid_pgp_kem_decrypt): New.
(agent_kem_decrypt): New.

--

Now, it only supports X25519 + ML-KEM.

GnuPG-bug-id: 7014
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2024-04-05 14:17:25 +09:00
parent 97f5159495
commit 131dd2a351
No known key found for this signature in database
GPG key ID: 640114AF89DE6054
3 changed files with 362 additions and 7 deletions
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12
agent/agent.h
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@ -560,6 +560,18 @@ gpg_error_t agent_pkdecrypt (ctrl_t ctrl, const char *desc_text,
const unsigned char *ciphertext, size_t ciphertextlen,
membuf_t *outbuf, int *r_padding);
enum kemid
{
KEM_PQC_PGP,
KEM_PGP,
KEM_CMS,
};
gpg_error_t agent_kem_decrypt (ctrl_t ctrl, const char *desc_text, int kemid,
const unsigned char *ct, size_t ctlen,
const unsigned char *option, size_t optionlen,
membuf_t *outbuf);
/*-- genkey.c --*/
#define CHECK_CONSTRAINTS_NOT_EMPTY 1
#define CHECK_CONSTRAINTS_NEW_SYMKEY 2