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started with formalized key export format definition based on rfc4880

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git@daemon.de
2014-02-07 16:56:57 +01:00
parent f94a9da803
commit cb873e3681
1 changed files with 77 additions and 2 deletions
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79
include/pcp/key.h
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@@ -1,7 +1,7 @@
/* /*
This file is part of Pretty Curved Privacy (pcp1). This file is part of Pretty Curved Privacy (pcp1).
Copyright (C) 2013 T.Linden. Copyright (C) 2014 T.v.Dein.
This program is free software: you can redistribute it and/or modify This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by it under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@
You should have received a copy of the GNU General Public License You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. along with this program. If not, see <http://www.gnu.org/licenses/>.
You can contact me by mail: <tlinden AT cpan DOT org>. You can contact me by mail: <tom AT vondein DOT org>.
*/ */
@@ -137,6 +137,81 @@ typedef struct _pcp_rec_t pcp_rec_t;
#define PCP_RAW_KEYSIZE sizeof(pcp_key_t) - sizeof(UT_hash_handle) #define PCP_RAW_KEYSIZE sizeof(pcp_key_t) - sizeof(UT_hash_handle)
#define PCP_RAW_PUBKEYSIZE sizeof(pcp_pubkey_t) - sizeof(UT_hash_handle) #define PCP_RAW_PUBKEYSIZE sizeof(pcp_pubkey_t) - sizeof(UT_hash_handle)
/* RFC4880 alike public key export with some simplifications:
In sig subpackets we're using fixed sized fields instead
of the mess they use in rfc4880. Sorry. We use only these types:
2 = Signature Creation Time (4 byte)
3 = Signature Expiration Time (4 byte)
9 = Key Expiration Time (4 bytes)
20 = Notation Data (4 byte flags, N bytes name+value)
27 = Key Flags (1 byte, use 0x02, 0x08 and 0x80
The actual signature field doesn't contain the 1st 16 bits
of the hash, since crypto_sign() created signatures consist
of the hash+signature anyway.
So, a full pubkey export looks like this
version
ctime
cipher
3 x raw keys \
sigheader > calc hash from this
sigsubs (header+data) /
hash
signature
We use big-endian always.
http://tools.ietf.org/html/rfc4880#section-5.2.3
*/
struct _pcp_rfc_pubkey_header_t {
uint8_t version;
uint32_t ctime;
uint8_t cipher;
};
struct _pcp_rfc_pubkey_0x21_t {
byte sig_ed25519_pub[crypto_sign_PUBLICKEYBYTES];
byte ed25519_pub[crypto_sign_PUBLICKEYBYTES];
byte curve25519_pub[crypto_box_PUBLICKEYBYTES];
};
struct _pcp_rfc_pubkey_sigheader_0x21_t {
uint8_t version;
uint8_t type; /* 0x1F only, self signed */
uint8_t pkcipher;
uint8_t hashcipher;
uint16_t numsubs;
};
struct _pcp_rfc_pubkey_sigsub_0x21_t {
uint32_t size;
uint8_t type;
};
struct _pcp_rfc_pubkey_sig_0x21_t {
byte signature[crypto_generichash_BYTES_MAX + crypto_sign_BYTES];
};
typedef struct _pcp_rfc_pubkey_header_t rfc_pub_h;
typedef struct _pcp_rfc_pubkey_0x21_t rfc_pub_k;
typedef struct _pcp_rfc_pubkey_sigheader_0x21_t rfc_pub_sig_h;
typedef struct _pcp_rfc_pubkey_sigsub_0x21_t rfc_pub_sig_s;
typedef struct _pcp_rfc_pubkey_sig_0x21_t rfc_pub_sig;
void pcp_cleanhashes(); void pcp_cleanhashes();
pcp_key_t *pcpkey_new (); pcp_key_t *pcpkey_new ();