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/*
* Copyright (C) 2007 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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 the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
/**
* @defgroup public_key public_key
* @{ @ingroup keys
*/
#ifndef PUBLIC_KEY_H_
#define PUBLIC_KEY_H_
typedef struct public_key_t public_key_t;
typedef enum key_type_t key_type_t;
typedef enum key_id_type_t key_id_type_t;
typedef enum signature_scheme_t signature_scheme_t;
#include <library.h>
#include <utils/identification.h>
/**
* Type of a key pair, the used crypto system
*/
enum key_type_t {
/** key type wildcard */
KEY_ANY = 0,
/** RSA crypto system as in PKCS#1 */
KEY_RSA = 1,
/** ECDSA as in ANSI X9.62 */
KEY_ECDSA = 2,
/** DSA */
KEY_DSA = 3,
/** ElGamal, ... */
};
/**
* Enum names for key_type_t
*/
extern enum_name_t *key_type_names;
/**
* Signature scheme for signature creation
*
* EMSA-PKCS1 signatures are defined in PKCS#1 standard.
* A prepended ASN.1 encoded digestInfo field contains the
* OID of the used hash algorithm. The ASN.1 type of the PKCS#7
* variants is OCTET_STRING instead of the default BIT_STRING.
*/
enum signature_scheme_t {
/** Unknown signature scheme */
SIGN_UNKNOWN,
/** EMSA-PKCS1_v1.5 signature over digest without digestInfo */
SIGN_RSA_EMSA_PKCS1_NULL,
/** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and MD5 */
SIGN_RSA_EMSA_PKCS1_MD5,
/** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and SHA-1 */
SIGN_RSA_EMSA_PKCS1_SHA1,
/** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and SHA-256 */
SIGN_RSA_EMSA_PKCS1_SHA256,
/** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and SHA-384 */
SIGN_RSA_EMSA_PKCS1_SHA384,
/** EMSA-PKCS1_v1.5 signature as in PKCS#1 using RSA and SHA-512 */
SIGN_RSA_EMSA_PKCS1_SHA512,
/** ECDSA over precomputed digest */
SIGN_ECDSA_WITH_NULL,
/** ECDSA with SHA-1 */
SIGN_ECDSA_WITH_SHA1,
/** ECDSA on the P-256 curve with SHA-256 as in RFC 4754 */
SIGN_ECDSA_256,
/** ECDSA on the P-384 curve with SHA-384 as in RFC 4754 */
SIGN_ECDSA_384,
/** ECDSA on the P-521 curve with SHA-512 as in RFC 4754 */
SIGN_ECDSA_521,
};
/**
* Enum names for signature_scheme_t
*/
extern enum_name_t *signature_scheme_names;
/**
* Abstract interface of a public key.
*/
struct public_key_t {
/**
* Get the key type.
*
* @return type of the key
*/
key_type_t (*get_type)(public_key_t *this);
/**
* Verifies a signature against a chunk of data.
*
* @param scheme signature scheme to use for verification, may be default
* @param data data to check signature against
* @param signature signature to check
* @return TRUE if signature matches
*/
bool (*verify)(public_key_t *this, signature_scheme_t scheme,
chunk_t data, chunk_t signature);
/**
* Encrypt a chunk of data.
*
* @param plain chunk containing plaintext data
* @param crypto where to allocate encrypted data
* @return TRUE if data successfully encrypted
*/
bool (*encrypt)(public_key_t *this, chunk_t plain, chunk_t *crypto);
/**
* Check if two public keys are equal.
*
* @param other other public key
* @return TRUE, if equality
*/
bool (*equals)(public_key_t *this, public_key_t *other);
/**
* Get the strength of the key in bytes.
*
* @return strength of the key in bytes
*/
size_t (*get_keysize) (public_key_t *this);
/**
* Get a unique key identifier, such as a hash over the key.
*
* @param type type of the key ID to get
* @return unique ID of the key as identification_t, or NULL
*/
identification_t* (*get_id) (public_key_t *this, id_type_t type);
/**
* Get an encoded form of the key.
*
* @todo Do we need a encoding type specification?
*
* @return allocated chunk containing encoded key
*/
chunk_t (*get_encoding)(public_key_t *this);
/**
* Increase the refcount of the key.
*
* @return this with an increased refcount
*/
public_key_t* (*get_ref)(public_key_t *this);
/**
* Destroy a public_key instance.
*/
void (*destroy)(public_key_t *this);
};
/**
* Conversion of ASN.1 signature or hash OID to signature scheme.
*
* @param oid ASN.1 OID
* @return signature_scheme, SIGN_UNKNOWN if OID is unsupported
*/
signature_scheme_t signature_scheme_from_oid(int oid);
#endif /** PUBLIC_KEY_H_ @}*/
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