328 lines
8.9 KiB
C
328 lines
8.9 KiB
C
/*
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* pgp.h
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* OpenPGP implementation.
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*
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* Copyright (c) 2005 Marko Kreen
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* contrib/pgcrypto/pgp.h
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*/
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#include "lib/stringinfo.h"
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#include "mbuf.h"
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#include "px.h"
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enum PGP_S2K_TYPE
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{
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PGP_S2K_SIMPLE = 0,
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PGP_S2K_SALTED = 1,
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PGP_S2K_ISALTED = 3
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};
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enum PGP_PKT_TYPE
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{
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PGP_PKT_RESERVED = 0,
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PGP_PKT_PUBENCRYPTED_SESSKEY = 1,
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PGP_PKT_SIGNATURE = 2,
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PGP_PKT_SYMENCRYPTED_SESSKEY = 3,
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PGP_PKT_SECRET_KEY = 5,
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PGP_PKT_PUBLIC_KEY = 6,
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PGP_PKT_SECRET_SUBKEY = 7,
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PGP_PKT_COMPRESSED_DATA = 8,
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PGP_PKT_SYMENCRYPTED_DATA = 9,
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PGP_PKT_MARKER = 10,
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PGP_PKT_LITERAL_DATA = 11,
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PGP_PKT_TRUST = 12,
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PGP_PKT_USER_ID = 13,
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PGP_PKT_PUBLIC_SUBKEY = 14,
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PGP_PKT_USER_ATTR = 17,
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PGP_PKT_SYMENCRYPTED_DATA_MDC = 18,
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PGP_PKT_MDC = 19,
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PGP_PKT_PRIV_61 = 61 /* occurs in gpg secring */
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};
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enum PGP_PUB_ALGO_TYPE
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{
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PGP_PUB_RSA_ENCRYPT_SIGN = 1,
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PGP_PUB_RSA_ENCRYPT = 2,
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PGP_PUB_RSA_SIGN = 3,
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PGP_PUB_ELG_ENCRYPT = 16,
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PGP_PUB_DSA_SIGN = 17
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};
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enum PGP_SYMENC_TYPE
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{
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PGP_SYM_PLAIN = 0, /* ?? */
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PGP_SYM_IDEA = 1, /* obsolete, PGP 2.6 compat */
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PGP_SYM_DES3 = 2, /* must */
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PGP_SYM_CAST5 = 3, /* should */
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PGP_SYM_BLOWFISH = 4,
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PGP_SYM_SAFER_SK128 = 5, /* obsolete */
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PGP_SYM_DES_SK = 6, /* obsolete */
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PGP_SYM_AES_128 = 7, /* should */
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PGP_SYM_AES_192 = 8,
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PGP_SYM_AES_256 = 9,
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PGP_SYM_TWOFISH = 10
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};
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enum PGP_COMPR_TYPE
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{
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PGP_COMPR_NONE = 0, /* must */
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PGP_COMPR_ZIP = 1, /* should */
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PGP_COMPR_ZLIB = 2,
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PGP_COMPR_BZIP2 = 3
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};
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enum PGP_DIGEST_TYPE
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{
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PGP_DIGEST_MD5 = 1, /* should, deprecated */
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PGP_DIGEST_SHA1 = 2, /* must */
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PGP_DIGEST_RIPEMD160 = 3,
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PGP_DIGEST_XSHA = 4, /* obsolete */
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PGP_DIGEST_MD2 = 5, /* obsolete */
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PGP_DIGEST_TIGER192 = 6, /* obsolete */
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PGP_DIGEST_HAVAL5_160 = 7, /* obsolete */
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PGP_DIGEST_SHA256 = 8,
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PGP_DIGEST_SHA384 = 9,
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PGP_DIGEST_SHA512 = 10
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};
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#define PGP_MAX_KEY (256/8)
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#define PGP_MAX_BLOCK (256/8)
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#define PGP_MAX_DIGEST (512/8)
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#define PGP_S2K_SALT 8
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typedef struct PGP_MPI PGP_MPI;
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typedef struct PGP_PubKey PGP_PubKey;
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typedef struct PGP_Context PGP_Context;
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typedef struct PGP_S2K PGP_S2K;
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struct PGP_S2K
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{
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uint8 mode;
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uint8 digest_algo;
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uint8 salt[8];
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uint8 iter; /* encoded (one-octet) count */
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/* calculated: */
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uint8 key[PGP_MAX_KEY];
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uint8 key_len;
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};
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struct PGP_Context
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{
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/*
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* parameters
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*/
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PGP_S2K s2k;
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int s2k_mode;
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int s2k_count; /* 4-byte decoded count */
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int s2k_digest_algo;
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int s2k_cipher_algo;
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int cipher_algo;
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int compress_algo;
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int compress_level;
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int disable_mdc;
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int use_sess_key;
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int text_mode;
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int convert_crlf;
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int unicode_mode;
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/*
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* internal variables
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*/
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int mdc_checked;
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int corrupt_prefix; /* prefix failed RFC 4880 "quick check" */
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int unsupported_compr; /* has bzip2 compression */
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int unexpected_binary; /* binary data seen in text_mode */
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int in_mdc_pkt;
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int use_mdcbuf_filter;
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PX_MD *mdc_ctx;
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PGP_PubKey *pub_key; /* ctx owns it */
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const uint8 *sym_key; /* ctx does not own it */
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int sym_key_len;
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/*
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* read or generated data
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*/
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uint8 sess_key[PGP_MAX_KEY];
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unsigned sess_key_len;
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};
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/* from RFC 4880 3.7.1.3 */
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#define s2k_decode_count(cval) \
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(((unsigned) 16 + (cval & 15)) << ((cval >> 4) + 6))
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struct PGP_MPI
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{
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uint8 *data;
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int bits;
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int bytes;
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};
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struct PGP_PubKey
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{
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uint8 ver;
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uint8 time[4];
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uint8 algo;
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/* public part */
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union
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{
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struct
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{
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PGP_MPI *p;
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PGP_MPI *g;
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PGP_MPI *y;
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} elg;
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struct
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{
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PGP_MPI *n;
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PGP_MPI *e;
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} rsa;
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struct
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{
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PGP_MPI *p;
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PGP_MPI *q;
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PGP_MPI *g;
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PGP_MPI *y;
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} dsa;
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} pub;
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/* secret part */
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union
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{
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struct
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{
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PGP_MPI *x;
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} elg;
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struct
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{
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PGP_MPI *d;
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PGP_MPI *p;
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PGP_MPI *q;
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PGP_MPI *u;
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} rsa;
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struct
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{
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PGP_MPI *x;
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} dsa;
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} sec;
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uint8 key_id[8];
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int can_encrypt;
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};
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int pgp_init(PGP_Context **ctx);
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int pgp_encrypt(PGP_Context *ctx, MBuf *src, MBuf *dst);
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int pgp_decrypt(PGP_Context *ctx, MBuf *src, MBuf *dst);
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int pgp_free(PGP_Context *ctx);
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int pgp_get_digest_code(const char *name);
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int pgp_get_cipher_code(const char *name);
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const char *pgp_get_digest_name(int code);
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const char *pgp_get_cipher_name(int code);
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int pgp_set_cipher_algo(PGP_Context *ctx, const char *name);
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int pgp_set_s2k_mode(PGP_Context *ctx, int type);
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int pgp_set_s2k_count(PGP_Context *ctx, int count);
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int pgp_set_s2k_cipher_algo(PGP_Context *ctx, const char *name);
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int pgp_set_s2k_digest_algo(PGP_Context *ctx, const char *name);
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int pgp_set_convert_crlf(PGP_Context *ctx, int doit);
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int pgp_disable_mdc(PGP_Context *ctx, int disable);
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int pgp_set_sess_key(PGP_Context *ctx, int use);
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int pgp_set_compress_algo(PGP_Context *ctx, int algo);
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int pgp_set_compress_level(PGP_Context *ctx, int level);
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int pgp_set_text_mode(PGP_Context *ctx, int mode);
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int pgp_set_unicode_mode(PGP_Context *ctx, int mode);
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int pgp_get_unicode_mode(PGP_Context *ctx);
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int pgp_set_symkey(PGP_Context *ctx, const uint8 *key, int klen);
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int pgp_set_pubkey(PGP_Context *ctx, MBuf *keypkt,
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const uint8 *key, int klen, int pubtype);
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int pgp_get_keyid(MBuf *pgp_data, char *dst);
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/* internal functions */
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int pgp_load_digest(int c, PX_MD **res);
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int pgp_load_cipher(int c, PX_Cipher **res);
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int pgp_get_cipher_key_size(int c);
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int pgp_get_cipher_block_size(int c);
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int pgp_s2k_fill(PGP_S2K *s2k, int mode, int digest_algo, int count);
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int pgp_s2k_read(PullFilter *src, PGP_S2K *s2k);
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int pgp_s2k_process(PGP_S2K *s2k, int cipher, const uint8 *key, int klen);
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typedef struct PGP_CFB PGP_CFB;
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int pgp_cfb_create(PGP_CFB **ctx_p, int algo,
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const uint8 *key, int key_len, int recync, uint8 *iv);
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void pgp_cfb_free(PGP_CFB *ctx);
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int pgp_cfb_encrypt(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst);
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int pgp_cfb_decrypt(PGP_CFB *ctx, const uint8 *data, int len, uint8 *dst);
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void pgp_armor_encode(const uint8 *src, unsigned len, StringInfo dst,
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int num_headers, char **keys, char **values);
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int pgp_armor_decode(const uint8 *src, int len, StringInfo dst);
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int pgp_extract_armor_headers(const uint8 *src, unsigned len,
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int *nheaders, char ***keys, char ***values);
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int pgp_compress_filter(PushFilter **res, PGP_Context *ctx, PushFilter *dst);
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int pgp_decompress_filter(PullFilter **res, PGP_Context *ctx, PullFilter *src);
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int pgp_key_alloc(PGP_PubKey **pk_p);
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void pgp_key_free(PGP_PubKey *pk);
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int _pgp_read_public_key(PullFilter *pkt, PGP_PubKey **pk_p);
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int pgp_parse_pubenc_sesskey(PGP_Context *ctx, PullFilter *pkt);
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int pgp_create_pkt_reader(PullFilter **pf_p, PullFilter *src, int len,
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int pkttype, PGP_Context *ctx);
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int pgp_parse_pkt_hdr(PullFilter *src, uint8 *tag, int *len_p,
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int allow_ctx);
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int pgp_skip_packet(PullFilter *pkt);
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int pgp_expect_packet_end(PullFilter *pkt);
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int pgp_write_pubenc_sesskey(PGP_Context *ctx, PushFilter *dst);
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int pgp_create_pkt_writer(PushFilter *dst, int tag, PushFilter **res_p);
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int pgp_mpi_alloc(int bits, PGP_MPI **mpi);
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int pgp_mpi_create(uint8 *data, int bits, PGP_MPI **mpi);
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int pgp_mpi_free(PGP_MPI *mpi);
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int pgp_mpi_read(PullFilter *src, PGP_MPI **mpi);
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int pgp_mpi_write(PushFilter *dst, PGP_MPI *n);
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int pgp_mpi_hash(PX_MD *md, PGP_MPI *n);
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unsigned pgp_mpi_cksum(unsigned cksum, PGP_MPI *n);
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int pgp_elgamal_encrypt(PGP_PubKey *pk, PGP_MPI *m,
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PGP_MPI **c1, PGP_MPI **c2);
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int pgp_elgamal_decrypt(PGP_PubKey *pk, PGP_MPI *c1, PGP_MPI *c2,
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PGP_MPI **m);
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int pgp_rsa_encrypt(PGP_PubKey *pk, PGP_MPI *m, PGP_MPI **c);
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int pgp_rsa_decrypt(PGP_PubKey *pk, PGP_MPI *c, PGP_MPI **m);
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extern struct PullFilterOps pgp_decrypt_filter;
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