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/*
* Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#ifndef GNUTLS_CRYPTO_H
#define GNUTLS_CRYPTO_H
#ifdef __cplusplus
extern "C"
{
#endif
typedef struct cipher_hd_st *gnutls_cipher_hd_t;
int gnutls_cipher_init (gnutls_cipher_hd_t * handle,
gnutls_cipher_algorithm_t cipher,
const gnutls_datum_t * key,
const gnutls_datum_t * iv);
int gnutls_cipher_encrypt (const gnutls_cipher_hd_t handle,
void *text, size_t textlen);
int gnutls_cipher_decrypt (const gnutls_cipher_hd_t handle,
void *ciphertext, size_t ciphertextlen);
int gnutls_cipher_decrypt2 (gnutls_cipher_hd_t handle,
const void *ciphertext, size_t ciphertextlen,
void *text, size_t textlen);
int gnutls_cipher_encrypt2 (gnutls_cipher_hd_t handle, void *text,
size_t textlen, void *ciphertext,
size_t ciphertextlen);
void gnutls_cipher_deinit (gnutls_cipher_hd_t handle);
int gnutls_cipher_get_block_size (gnutls_cipher_algorithm_t algorithm);
typedef struct hash_hd_st *gnutls_hash_hd_t;
typedef struct hmac_hd_st *gnutls_hmac_hd_t;
int gnutls_hmac_init (gnutls_hmac_hd_t * dig,
gnutls_digest_algorithm_t algorithm, const void *key,
size_t keylen);
int gnutls_hmac (gnutls_hmac_hd_t handle, const void *text, size_t textlen);
void gnutls_hmac_output (gnutls_hmac_hd_t handle, void *digest);
void gnutls_hmac_deinit (gnutls_hmac_hd_t handle, void *digest);
int gnutls_hmac_get_len (gnutls_mac_algorithm_t algorithm);
int gnutls_hmac_fast (gnutls_mac_algorithm_t algorithm, const void *key,
size_t keylen, const void *text, size_t textlen,
void *digest);
int gnutls_hash_init (gnutls_hash_hd_t * dig,
gnutls_digest_algorithm_t algorithm);
int gnutls_hash (gnutls_hash_hd_t handle, const void *text, size_t textlen);
void gnutls_hash_output (gnutls_hash_hd_t handle, void *digest);
void gnutls_hash_deinit (gnutls_hash_hd_t handle, void *digest);
int gnutls_hash_get_len (gnutls_digest_algorithm_t algorithm);
int gnutls_hash_fast (gnutls_digest_algorithm_t algorithm,
const void *text, size_t textlen, void *digest);
/* register ciphers */
#define GNUTLS_CRYPTO_API_VERSION 0x03
#define gnutls_crypto_single_cipher_st gnutls_crypto_cipher_st
#define gnutls_crypto_single_mac_st gnutls_crypto_mac_st
#define gnutls_crypto_single_digest_st gnutls_crypto_digest_st
typedef struct
{
int (*init) (gnutls_cipher_algorithm_t, void **ctx);
int (*setkey) (void *ctx, const void *key, size_t keysize);
int (*setiv) (void *ctx, const void *iv, size_t ivsize);
int (*encrypt) (void *ctx, const void *plain, size_t plainsize,
void *encr, size_t encrsize);
int (*decrypt) (void *ctx, const void *encr, size_t encrsize,
void *plain, size_t plainsize);
void (*deinit) (void *ctx);
} gnutls_crypto_cipher_st;
typedef struct
{
int (*init) (gnutls_mac_algorithm_t, void **ctx);
int (*setkey) (void *ctx, const void *key, size_t keysize);
int (*hash) (void *ctx, const void *text, size_t textsize);
int (*output) (void *src_ctx, void *digest, size_t digestsize);
void (*deinit) (void *ctx);
} gnutls_crypto_mac_st;
typedef struct
{
int (*init) (gnutls_mac_algorithm_t, void **ctx);
int (*hash) (void *ctx, const void *text, size_t textsize);
int (*copy) (void **dst_ctx, void *src_ctx);
int (*output) (void *src_ctx, void *digest, size_t digestsize);
void (*deinit) (void *ctx);
} gnutls_crypto_digest_st;
/**
* gnutls_rnd_level_t:
* @GNUTLS_RND_NONCE: Non-predictable random number. Fatal in parts
* of session if broken, i.e., vulnerable to statistical analysis.
* @GNUTLS_RND_RANDOM: Pseudo-random cryptographic random number.
* Fatal in session if broken.
* @GNUTLS_RND_KEY: Fatal in many sessions if broken.
*
* Enumeration of random quality levels.
*/
typedef enum gnutls_rnd_level
{
GNUTLS_RND_NONCE = 0,
GNUTLS_RND_RANDOM = 1,
GNUTLS_RND_KEY = 2
} gnutls_rnd_level_t;
int gnutls_rnd (gnutls_rnd_level_t level, void *data, size_t len);
/**
* gnutls_pk_flag_t:
* @GNUTLS_PK_FLAG_NONE: No flag.
*
* Enumeration of public-key flag.
*/
typedef enum
{
GNUTLS_PK_FLAG_NONE = 0
} gnutls_pk_flag_t;
typedef struct gnutls_crypto_rnd
{
int (*init) (void **ctx);
int (*rnd) (void *ctx, int level, void *data, size_t datasize);
void (*deinit) (void *ctx);
} gnutls_crypto_rnd_st;
typedef void *bigint_t;
/**
* gnutls_bigint_format_t:
* @GNUTLS_MPI_FORMAT_USG: Raw unsigned integer format.
* @GNUTLS_MPI_FORMAT_STD: Raw signed integer format, always a leading
* zero when positive.
* @GNUTLS_MPI_FORMAT_PGP: The pgp integer format.
*
* Enumeration of different bignum integer encoding formats.
*/
typedef enum
{
/* raw unsigned integer format */
GNUTLS_MPI_FORMAT_USG = 0,
/* raw signed integer format - always a leading zero when positive */
GNUTLS_MPI_FORMAT_STD = 1,
/* the pgp integer format */
GNUTLS_MPI_FORMAT_PGP = 2
} gnutls_bigint_format_t;
typedef struct
{
bigint_t g; /* group generator */
bigint_t p; /* prime */
} gnutls_group_st;
/* Multi precision integer arithmetic */
typedef struct gnutls_crypto_bigint
{
bigint_t (*bigint_new) (int nbits);
void (*bigint_release) (bigint_t n);
/* 0 for equality, > 0 for m1>m2, < 0 for m1<m2 */
int (*bigint_cmp) (const bigint_t m1, const bigint_t m2);
/* as bigint_cmp */
int (*bigint_cmp_ui) (const bigint_t m1, unsigned long m2);
/* ret = a % b */
bigint_t (*bigint_mod) (const bigint_t a, const bigint_t b);
/* a = b -> ret == a */
bigint_t (*bigint_set) (bigint_t a, const bigint_t b);
/* a = b -> ret == a */
bigint_t (*bigint_set_ui) (bigint_t a, unsigned long b);
unsigned int (*bigint_get_nbits) (const bigint_t a);
/* w = b ^ e mod m */
bigint_t (*bigint_powm) (bigint_t w, const bigint_t b,
const bigint_t e, const bigint_t m);
/* w = a + b mod m */
bigint_t (*bigint_addm) (bigint_t w, const bigint_t a,
const bigint_t b, const bigint_t m);
/* w = a - b mod m */
bigint_t (*bigint_subm) (bigint_t w, const bigint_t a, const bigint_t b,
const bigint_t m);
/* w = a * b mod m */
bigint_t (*bigint_mulm) (bigint_t w, const bigint_t a, const bigint_t b,
const bigint_t m);
/* w = a + b */ bigint_t (*bigint_add) (bigint_t w, const bigint_t a,
const bigint_t b);
/* w = a - b */ bigint_t (*bigint_sub) (bigint_t w, const bigint_t a,
const bigint_t b);
/* w = a * b */
bigint_t (*bigint_mul) (bigint_t w, const bigint_t a, const bigint_t b);
/* w = a + b */
bigint_t (*bigint_add_ui) (bigint_t w, const bigint_t a,
unsigned long b);
/* w = a - b */
bigint_t (*bigint_sub_ui) (bigint_t w, const bigint_t a,
unsigned long b);
/* w = a * b */
bigint_t (*bigint_mul_ui) (bigint_t w, const bigint_t a,
unsigned long b);
/* q = a / b */
bigint_t (*bigint_div) (bigint_t q, const bigint_t a, const bigint_t b);
/* 0 if prime */
int (*bigint_prime_check) (const bigint_t pp);
int (*bigint_generate_group) (gnutls_group_st * gg, unsigned int bits);
/* reads an bigint from a buffer */
/* stores an bigint into the buffer. returns
* GNUTLS_E_SHORT_MEMORY_BUFFER if buf_size is not sufficient to
* store this integer, and updates the buf_size;
*/
bigint_t (*bigint_scan) (const void *buf, size_t buf_size,
gnutls_bigint_format_t format);
int (*bigint_print) (const bigint_t a, void *buf, size_t * buf_size,
gnutls_bigint_format_t format);
} gnutls_crypto_bigint_st;
#define GNUTLS_MAX_PK_PARAMS 16
typedef struct
{
bigint_t params[GNUTLS_MAX_PK_PARAMS];
unsigned int params_nr; /* the number of parameters */
unsigned int flags;
} gnutls_pk_params_st;
void gnutls_pk_params_release (gnutls_pk_params_st * p);
void gnutls_pk_params_init (gnutls_pk_params_st * p);
/* params are:
* RSA:
* [0] is modulus
* [1] is public exponent
* [2] is private exponent (private key only)
* [3] is prime1 (p) (private key only)
* [4] is prime2 (q) (private key only)
* [5] is coefficient (u == inverse of p mod q) (private key only)
* [6] e1 == d mod (p-1)
* [7] e2 == d mod (q-1)
*
* note that for libgcrypt that does not use the inverse of q mod p,
* we need to perform conversions using fixup_params().
*
* DSA:
* [0] is p
* [1] is q
* [2] is g
* [3] is y (public key)
* [4] is x (private key only)
*/
/**
* gnutls_direction_t:
* @GNUTLS_IMPORT: Import direction.
* @GNUTLS_EXPORT: Export direction.
*
* Enumeration of different directions.
*/
typedef enum
{
GNUTLS_IMPORT = 0,
GNUTLS_EXPORT = 1
} gnutls_direction_t;
/* Public key algorithms */
typedef struct gnutls_crypto_pk
{
/* The params structure should contain the private or public key
* parameters, depending on the operation */
int (*encrypt) (gnutls_pk_algorithm_t, gnutls_datum_t * ciphertext,
const gnutls_datum_t * plaintext,
const gnutls_pk_params_st * pub);
int (*decrypt) (gnutls_pk_algorithm_t, gnutls_datum_t * plaintext,
const gnutls_datum_t * ciphertext,
const gnutls_pk_params_st * priv);
int (*sign) (gnutls_pk_algorithm_t, gnutls_datum_t * signature,
const gnutls_datum_t * data,
const gnutls_pk_params_st * priv);
int (*verify) (gnutls_pk_algorithm_t, const gnutls_datum_t * data,
const gnutls_datum_t * signature,
const gnutls_pk_params_st * pub);
int (*generate) (gnutls_pk_algorithm_t, unsigned int nbits,
gnutls_pk_params_st *);
/* this function should convert params to ones suitable
* for the above functions
*/
int (*pk_fixup_private_params) (gnutls_pk_algorithm_t, gnutls_direction_t,
gnutls_pk_params_st *);
} gnutls_crypto_pk_st;
/* priority: infinity for backend algorithms, 90 for kernel
algorithms, lowest wins
*/
#define gnutls_crypto_single_cipher_register(algo, prio, st) \
gnutls_crypto_single_cipher_register2 (algo, prio, \
GNUTLS_CRYPTO_API_VERSION, st)
#define gnutls_crypto_single_mac_register(algo, prio, st) \
gnutls_crypto_single_mac_register2 (algo, prio, \
GNUTLS_CRYPTO_API_VERSION, st)
#define gnutls_crypto_single_digest_register(algo, prio, st) \
gnutls_crypto_single_digest_register2(algo, prio, \
GNUTLS_CRYPTO_API_VERSION, st)
int gnutls_crypto_single_cipher_register2 (gnutls_cipher_algorithm_t
algorithm, int priority,
int version,
const
gnutls_crypto_single_cipher_st *
s);
int gnutls_crypto_single_mac_register2 (gnutls_mac_algorithm_t algorithm,
int priority, int version,
const gnutls_crypto_single_mac_st *
s);
int gnutls_crypto_single_digest_register2 (gnutls_digest_algorithm_t
algorithm, int priority,
int version,
const
gnutls_crypto_single_digest_st *
s);
#define gnutls_crypto_cipher_register(prio, st) \
gnutls_crypto_cipher_register2 (prio, GNUTLS_CRYPTO_API_VERSION, st)
#define gnutls_crypto_mac_register(prio, st) \
gnutls_crypto_mac_register2 (prio, GNUTLS_CRYPTO_API_VERSION, st)
#define gnutls_crypto_digest_register(prio, st) \
gnutls_crypto_digest_register2 (prio, GNUTLS_CRYPTO_API_VERSION, st)
int gnutls_crypto_cipher_register2 (int priority, int version,
const gnutls_crypto_cipher_st * s);
int gnutls_crypto_mac_register2 (int priority, int version,
const gnutls_crypto_mac_st * s);
int gnutls_crypto_digest_register2 (int priority, int version,
const gnutls_crypto_digest_st * s);
#define gnutls_crypto_rnd_register(prio, st) \
gnutls_crypto_rnd_register2 (prio, GNUTLS_CRYPTO_API_VERSION, st)
#define gnutls_crypto_pk_register(prio, st) \
gnutls_crypto_pk_register2 (prio, GNUTLS_CRYPTO_API_VERSION, st)
#define gnutls_crypto_bigint_register(prio, st) \
gnutls_crypto_bigint_register2 (prio, GNUTLS_CRYPTO_API_VERSION, st)
int gnutls_crypto_rnd_register2 (int priority, int version,
const gnutls_crypto_rnd_st * s);
int gnutls_crypto_pk_register2 (int priority, int version,
const gnutls_crypto_pk_st * s);
int gnutls_crypto_bigint_register2 (int priority, int version,
const gnutls_crypto_bigint_st * s);
#ifdef __cplusplus
}
#endif
#endif