[thirdparty/strongswan.git] / programs / charon / charon / encoding / payloads / transform_substructure.c

/**
 * @file transform_substructure.h
 * 
 * @brief Implementation of transform_substructure_t.
 * 
 */

/*
 * Copyright (C) 2005 Jan Hutter, 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.
 */

#include <stddef.h>

#include "transform_substructure.h"

#include <encoding/payloads/transform_attribute.h>
#include <encoding/payloads/encodings.h>
#include <types.h>
#include <utils/linked_list.h>


typedef struct private_transform_substructure_t private_transform_substructure_t;

/**
 * Private data of an transform_substructure_t object.
 * 
 */
struct private_transform_substructure_t {
	/**
	 * Public transform_substructure_t interface.
	 */
	transform_substructure_t public;
	
	/**
	 * Next payload type.
	 */
	u_int8_t  next_payload;

	
	/**
	 * Length of this payload.
	 */
	u_int16_t transform_length;
	
	
	/**
	 * Type of the transform.
	 */
	u_int8_t	 transform_type;
	
	/**
	 * Transform ID.
	 */
	u_int16_t transform_id;
	
 	/**
 	 * Transforms Attributes are stored in a linked_list_t.
 	 */
	linked_list_t *attributes;
	
	/**
	 * @brief Computes the length of this substructure.
	 *
	 * @param this 	calling private_transform_substructure_t object
	 */
	void (*compute_length) (private_transform_substructure_t *this);
};


/**
 * Encoding rules to parse or generate a Transform substructure.
 * 
 * The defined offsets are the positions in a object of type 
 * private_transform_substructure_t.
 * 
 */
encoding_rule_t transform_substructure_encodings[] = {
 	/* 1 Byte next payload type, stored in the field next_payload */
	{ U_INT_8,			offsetof(private_transform_substructure_t, next_payload) 		},
	/* Reserved Byte is skipped */
	{ RESERVED_BYTE,		0																},	
	/* Length of the whole transform substructure*/
	{ PAYLOAD_LENGTH,		offsetof(private_transform_substructure_t, transform_length)	},	
	/* transform type is a number of 8 bit */
	{ U_INT_8,				offsetof(private_transform_substructure_t, transform_type) 	},	
	/* Reserved Byte is skipped */
	{ RESERVED_BYTE,		0																},	
	/* tranform ID is a number of 8 bit */
	{ U_INT_16,				offsetof(private_transform_substructure_t, transform_id)		},	
	/* Attributes are stored in a transform attribute, 
	   offset points to a linked_list_t pointer */
	{ TRANSFORM_ATTRIBUTES,	offsetof(private_transform_substructure_t, attributes) 		}
};

/*
                           1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      ! 0 (last) or 3 !   RESERVED    !        Transform Length       !
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      !Transform Type !   RESERVED    !          Transform ID         !
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      !                                                               !
      ~                      Transform Attributes                     ~
      !                                                               !
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/


/**
 * Implementation of payload_t.verify.
 */
static status_t verify(private_transform_substructure_t *this)
{
	status_t status = SUCCESS;
	iterator_t *iterator;
	
	if ((this->next_payload != NO_PAYLOAD) && (this->next_payload != 3))
	{
		/* must be 0 or 3 */
		return FAILED;
	}

	switch (this->transform_type)
	{
		case ENCRYPTION_ALGORITHM:
		{
			if ((this->transform_id < ENCR_DES_IV64) || (this->transform_id > ENCR_AES_CTR))
			{
				return FAILED;
			}
			break;
		}
		case PSEUDO_RANDOM_FUNCTION:
		{
			if ((this->transform_id < PRF_HMAC_MD5) || (this->transform_id > PRF_AES128_CBC))
			{
				return FAILED;
			}
			break;
		}
		case INTEGRITY_ALGORITHM:
		{
			if ((this->transform_id < AUTH_HMAC_MD5_96) || (this->transform_id > AUTH_AES_XCBC_96))
			{
				return FAILED;
			}
			break;
		}
		case DIFFIE_HELLMAN_GROUP:
		{
			switch (this->transform_id)
			{
				case MODP_768_BIT:
				case MODP_1024_BIT:
				case MODP_1536_BIT:
				case MODP_2048_BIT:
				case MODP_3072_BIT:
				case MODP_4096_BIT:
				case MODP_6144_BIT:
				case MODP_8192_BIT:
				{
					break;
				}
				default:
				{
					return FAILED;
				}
			}
			
			
			break;
		}
		case EXTENDED_SEQUENCE_NUMBERS:
		{
			if ((this->transform_id != NO_EXT_SEQ_NUMBERS) && (this->transform_id != EXT_SEQ_NUMBERS))
			{
				return FAILED;
			}
			break;
		}
		default:
		{
			/* not a supported transform type! */
			return FAILED;
		}
	}
	iterator = this->attributes->create_iterator(this->attributes,TRUE);
	
	while(iterator->has_next(iterator))
	{
		payload_t *current_attributes;
		iterator->current(iterator,(void **)&current_attributes);

		status = current_attributes->verify(current_attributes);
		if (status != SUCCESS)
		{
			break;
		}
	}
	
	iterator->destroy(iterator);


	/* proposal number is checked in SA payload */	
	return status;
}

/**
 * Implementation of payload_t.get_encoding_rules.
 */
static void get_encoding_rules(private_transform_substructure_t *this, encoding_rule_t **rules, size_t *rule_count)
{
	*rules = transform_substructure_encodings;
	*rule_count = sizeof(transform_substructure_encodings) / sizeof(encoding_rule_t);
}

/**
 * Implementation of payload_t.get_type.
 */
static payload_type_t get_type(private_transform_substructure_t *this)
{
	return TRANSFORM_SUBSTRUCTURE;
}

/**
 * Implementation of payload_t.get_next_type.
 */
static payload_type_t get_next_type(private_transform_substructure_t *this)
{
	return (this->next_payload);
}

/**
 * Implementation of payload_t.get_length.
 */
static size_t get_length(private_transform_substructure_t *this)
{
	this->compute_length(this);
		
	return this->transform_length;
}

/**
 * Implementation of transform_substructure_t.create_transform_attribute_iterator.
 */
static iterator_t *create_transform_attribute_iterator (private_transform_substructure_t *this,bool forward)
{
	return this->attributes->create_iterator(this->attributes,forward);
}

/**
 * Implementation of transform_substructure_t.add_transform_attribute.
 */
static void add_transform_attribute (private_transform_substructure_t *this,transform_attribute_t *attribute)
{
	this->attributes->insert_last(this->attributes,(void *) attribute);
	this->compute_length(this);
}

/**
 * Implementation of transform_substructure_t.set_is_last_transform.
 */
static void set_is_last_transform (private_transform_substructure_t *this, bool is_last)
{
	this->next_payload = (is_last) ? 0: TRANSFORM_TYPE_VALUE;
}

/**
 * Implementation of transform_substructure_t.get_is_last_transform.
 */
static bool get_is_last_transform (private_transform_substructure_t *this)
{
	return ((this->next_payload == TRANSFORM_TYPE_VALUE) ? FALSE : TRUE);
}

/**
 * Implementation of payload_t.set_next_type.
 */
static void set_next_type(private_transform_substructure_t *this,payload_type_t type)
{
}

/**
 * Implementation of transform_substructure_t.set_transform_type.
 */
static void set_transform_type (private_transform_substructure_t *this,u_int8_t type)
{
	this->transform_type = type;
}
	
/**
 * Implementation of transform_substructure_t.get_transform_type.
 */
static u_int8_t get_transform_type (private_transform_substructure_t *this)
{
	return this->transform_type;
}

/**
 * Implementation of transform_substructure_t.set_transform_id.
 */
static void set_transform_id (private_transform_substructure_t *this,u_int16_t id)
{
	this->transform_id = id;
}
	
/**
 * Implementation of transform_substructure_t.get_transform_id.
 */
static u_int16_t get_transform_id (private_transform_substructure_t *this)
{
	return this->transform_id;
}

/**
 * Implementation of private_transform_substructure_t.compute_length.
 */
static void compute_length (private_transform_substructure_t *this)
{
	iterator_t *iterator;
	size_t length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
	iterator = this->attributes->create_iterator(this->attributes,TRUE);
	while (iterator->has_next(iterator))
	{
		payload_t * current_attribute;
		iterator->current(iterator,(void **) &current_attribute);
		length += current_attribute->get_length(current_attribute);
	}
	iterator->destroy(iterator);
	
	this->transform_length = length;
}

/**
 * Implementation of transform_substructure_t.clone.
 */
static transform_substructure_t *clone(private_transform_substructure_t *this)
{
	private_transform_substructure_t *new_clone;
	iterator_t *attributes;
	
	new_clone = (private_transform_substructure_t *) transform_substructure_create();
	
	new_clone->next_payload = this->next_payload;
	new_clone->transform_type = this->transform_type;
	new_clone->transform_id = this->transform_id;

	attributes = this->attributes->create_iterator(this->attributes,FALSE);

	while (attributes->has_next(attributes))
	{
		transform_attribute_t *current_attribute;
		transform_attribute_t *current_attribute_clone;
		attributes->current(attributes,(void **) &current_attribute);

		current_attribute_clone = current_attribute->clone(current_attribute);
		
		new_clone->public.add_transform_attribute(&(new_clone->public),current_attribute_clone);
	}
	
	attributes->destroy(attributes);	
	
	return &(new_clone->public);
}


/**
 * Implementation of transform_substructure_t.get_key_length.
 */
static status_t get_key_length(private_transform_substructure_t *this, u_int16_t *key_length)
{
	iterator_t *attributes;
	
	attributes = this->attributes->create_iterator(this->attributes,TRUE);

	while (attributes->has_next(attributes))
	{
		transform_attribute_t *current_attribute;
		attributes->current(attributes,(void **) &current_attribute);

		if (current_attribute->get_attribute_type(current_attribute) == KEY_LENGTH)
		{
			*key_length = current_attribute->get_value(current_attribute);
			attributes->destroy(attributes);	
			return SUCCESS;
		}
		
	}
	attributes->destroy(attributes);
	
	return FAILED;
}


/**
 * Implementation of transform_substructure_t.destroy and payload_t.destroy.
 */
static void destroy(private_transform_substructure_t *this)
{
	/* all proposals are getting destroyed */ 
	while (this->attributes->get_count(this->attributes) > 0)
	{
		transform_attribute_t *current_attribute;
		this->attributes->remove_last(this->attributes,(void **)&current_attribute);
		current_attribute->destroy(current_attribute);
	}
	this->attributes->destroy(this->attributes);
	
	free(this);
}

/*
 * Described in header.
 */
transform_substructure_t *transform_substructure_create()
{
	private_transform_substructure_t *this = malloc_thing(private_transform_substructure_t);

	/* payload interface */
	this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
	this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
	this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
	this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
	this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;	
	this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
	this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
	
	/* public functions */
	this->public.create_transform_attribute_iterator = (iterator_t * (*) (transform_substructure_t *,bool)) create_transform_attribute_iterator;
	this->public.add_transform_attribute = (void (*) (transform_substructure_t *,transform_attribute_t *)) add_transform_attribute;
	this->public.set_is_last_transform = (void (*) (transform_substructure_t *,bool)) set_is_last_transform;
	this->public.get_is_last_transform = (bool (*) (transform_substructure_t *)) get_is_last_transform;
	this->public.set_transform_type = (void (*) (transform_substructure_t *,u_int8_t)) set_transform_type;
	this->public.get_transform_type = (u_int8_t (*) (transform_substructure_t *)) get_transform_type;
	this->public.set_transform_id = (void (*) (transform_substructure_t *,u_int16_t)) set_transform_id;
	this->public.get_transform_id = (u_int16_t (*) (transform_substructure_t *)) get_transform_id;
	this->public.get_key_length = (status_t (*) (transform_substructure_t *,u_int16_t *)) get_key_length;
	this->public.clone = (transform_substructure_t* (*) (transform_substructure_t *)) clone;
	this->public.destroy = (void (*) (transform_substructure_t *)) destroy;
	
	/* private functions */
	this->compute_length = compute_length;
	
	/* set default values of the fields */
	this->next_payload = NO_PAYLOAD;
	this->transform_length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
	this->transform_id = 0;
	this->transform_type = 0;
	this->attributes = linked_list_create();
	
	return (&(this->public));
}

/*
 * Described in header
 */
transform_substructure_t *transform_substructure_create_type(transform_type_t transform_type, u_int16_t transform_id, u_int16_t key_length)
{
	transform_substructure_t *transform = transform_substructure_create();
	
	transform->set_transform_type(transform,transform_type);
	transform->set_transform_id(transform,transform_id);
	
	/* a keylength attribute is only created for AES encryption */
	if (transform_type == ENCRYPTION_ALGORITHM &&
		transform_id == ENCR_AES_CBC)
	{
		transform_attribute_t *attribute = transform_attribute_create_key_length(key_length);
		transform->add_transform_attribute(transform,attribute);		
	}

	return transform;
}
Commit	Line	Data
b860cffd JH	1	/**
	2	* @file transform_substructure.h
	3	*
3fe05870	4	* @brief Implementation of transform_substructure_t.
b860cffd JH	5	*
	6	*/
	7
	8	/*
	9	* Copyright (C) 2005 Jan Hutter, Martin Willi
	10	* Hochschule fuer Technik Rapperswil
	11	*
	12	* This program is free software; you can redistribute it and/or modify it
	13	* under the terms of the GNU General Public License as published by the
	14	* Free Software Foundation; either version 2 of the License, or (at your
	15	* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
	16	*
	17	* This program is distributed in the hope that it will be useful, but
	18	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	19	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	20	* for more details.
	21	*/
5113680f	22
b860cffd JH	23	#include <stddef.h>
	24
	25	#include "transform_substructure.h"
	26
4a962238 MW	27	#include <encoding/payloads/transform_attribute.h>
4a962238 MW	28	#include <encoding/payloads/encodings.h>
696be022	29	#include <types.h>
696be022	30	#include <utils/linked_list.h>
b860cffd	31
95c61cb9 JH	32
	33	typedef struct private_transform_substructure_t private_transform_substructure_t;
	34
b860cffd	35	/**
3fe05870	36	* Private data of an transform_substructure_t object.
b860cffd JH	37	*
b860cffd JH	38	*/
95c61cb9	39	struct private_transform_substructure_t {
b860cffd	40	/**
3fe05870	41	* Public transform_substructure_t interface.
b860cffd JH	42	*/
	43	transform_substructure_t public;
	44
	45	/**
3fe05870	46	* Next payload type.
b860cffd JH	47	*/
	48	u_int8_t next_payload;
	49
	50
	51	/**
3fe05870	52	* Length of this payload.
b860cffd JH	53	*/
	54	u_int16_t transform_length;
	55
	56
	57	/**
3fe05870	58	* Type of the transform.
b860cffd JH	59	*/
	60	u_int8_t transform_type;
	61
	62	/**
3fe05870	63	* Transform ID.
b860cffd	64	*/
f3c01a28	65	u_int16_t transform_id;
b860cffd JH	66
b860cffd JH	67	/**
3fe05870	68	* Transforms Attributes are stored in a linked_list_t.
b860cffd	69	*/
f3c01a28	70	linked_list_t *attributes;
b3fd2b72 JH	71
	72	/**
	73	* @brief Computes the length of this substructure.
	74	*
	75	* @param this calling private_transform_substructure_t object
b3fd2b72	76	*/
3fe05870	77	void (compute_length) (private_transform_substructure_t this);
b860cffd JH	78	};
	79
	80
	81	/**
3fe05870	82	* Encoding rules to parse or generate a Transform substructure.
b860cffd JH	83	*
	84	* The defined offsets are the positions in a object of type
	85	* private_transform_substructure_t.
	86	*
	87	*/
	88	encoding_rule_t transform_substructure_encodings[] = {
	89	/* 1 Byte next payload type, stored in the field next_payload */
	90	{ U_INT_8, offsetof(private_transform_substructure_t, next_payload) },
	91	/* Reserved Byte is skipped */
	92	{ RESERVED_BYTE, 0 },
	93	/* Length of the whole transform substructure*/
	94	{ PAYLOAD_LENGTH, offsetof(private_transform_substructure_t, transform_length) },
	95	/* transform type is a number of 8 bit */
	96	{ U_INT_8, offsetof(private_transform_substructure_t, transform_type) },
	97	/* Reserved Byte is skipped */
	98	{ RESERVED_BYTE, 0 },
	99	/* tranform ID is a number of 8 bit */
f3c01a28	100	{ U_INT_16, offsetof(private_transform_substructure_t, transform_id) },
b860cffd JH	101	/* Attributes are stored in a transform attribute,
	102	offset points to a linked_list_t pointer */
	103	{ TRANSFORM_ATTRIBUTES, offsetof(private_transform_substructure_t, attributes) }
	104	};
	105
e31eb71e JH	106	/*
	107	1 2 3
	108	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	109	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	110	! 0 (last) or 3 ! RESERVED ! Transform Length !
	111	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	112	!Transform Type ! RESERVED ! Transform ID !
	113	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	114	! !
	115	~ Transform Attributes ~
	116	! !
	117	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	118	*/
	119
	120
	121	/**
3fe05870	122	* Implementation of payload_t.verify.
e31eb71e JH	123	*/
	124	static status_t verify(private_transform_substructure_t *this)
	125	{
346af6f3 JH	126	status_t status = SUCCESS;
	127	iterator_t *iterator;
	128
	129	if ((this->next_payload != NO_PAYLOAD) && (this->next_payload != 3))
e31eb71e JH	130	{
	131	/* must be 0 or 3 */
	132	return FAILED;
	133	}
	134
	135	switch (this->transform_type)
	136	{
	137	case ENCRYPTION_ALGORITHM:
	138	{
	139	if ((this->transform_id < ENCR_DES_IV64) \|\| (this->transform_id > ENCR_AES_CTR))
	140	{
	141	return FAILED;
	142	}
	143	break;
	144	}
c06dbbab	145	case PSEUDO_RANDOM_FUNCTION:
e31eb71e JH	146	{
	147	if ((this->transform_id < PRF_HMAC_MD5) \|\| (this->transform_id > PRF_AES128_CBC))
	148	{
	149	return FAILED;
	150	}
	151	break;
	152	}
b9d9f188	153	case INTEGRITY_ALGORITHM:
e31eb71e JH	154	{
	155	if ((this->transform_id < AUTH_HMAC_MD5_96) \|\| (this->transform_id > AUTH_AES_XCBC_96))
	156	{
	157	return FAILED;
	158	}
	159	break;
	160	}
	161	case DIFFIE_HELLMAN_GROUP:
	162	{
	163	switch (this->transform_id)
	164	{
	165	case MODP_768_BIT:
	166	case MODP_1024_BIT:
	167	case MODP_1536_BIT:
	168	case MODP_2048_BIT:
	169	case MODP_3072_BIT:
	170	case MODP_4096_BIT:
	171	case MODP_6144_BIT:
	172	case MODP_8192_BIT:
	173	{
	174	break;
	175	}
	176	default:
	177	{
	178	return FAILED;
	179	}
	180	}
	181
	182
	183	break;
	184	}
343acebe	185	case EXTENDED_SEQUENCE_NUMBERS:
e31eb71e JH	186	{
	187	if ((this->transform_id != NO_EXT_SEQ_NUMBERS) && (this->transform_id != EXT_SEQ_NUMBERS))
	188	{
	189	return FAILED;
	190	}
	191	break;
	192	}
	193	default:
	194	{
	195	/* not a supported transform type! */
	196	return FAILED;
	197	}
	198	}
346af6f3 JH	199	iterator = this->attributes->create_iterator(this->attributes,TRUE);
	200
	201	while(iterator->has_next(iterator))
	202	{
	203	payload_t *current_attributes;
	204	iterator->current(iterator,(void **)&current_attributes);
	205
	206	status = current_attributes->verify(current_attributes);
	207	if (status != SUCCESS)
	208	{
	209	break;
	210	}
	211	}
	212
	213	iterator->destroy(iterator);
	214
e31eb71e JH	215
e31eb71e JH	216	/* proposal number is checked in SA payload */
346af6f3	217	return status;
e31eb71e JH	218	}
e31eb71e JH	219
b860cffd	220	/**
3fe05870	221	* Implementation of payload_t.get_encoding_rules.
b860cffd	222	*/
3fe05870	223	static void get_encoding_rules(private_transform_substructure_t this, encoding_rule_t rules, size_t rule_count)
b860cffd JH	224	{
	225	*rules = transform_substructure_encodings;
	226	*rule_count = sizeof(transform_substructure_encodings) / sizeof(encoding_rule_t);
b860cffd JH	227	}
	228
	229	/**
3fe05870	230	* Implementation of payload_t.get_type.
b860cffd JH	231	*/
	232	static payload_type_t get_type(private_transform_substructure_t *this)
	233	{
	234	return TRANSFORM_SUBSTRUCTURE;
	235	}
	236
	237	/**
3fe05870	238	* Implementation of payload_t.get_next_type.
b860cffd JH	239	*/
	240	static payload_type_t get_next_type(private_transform_substructure_t *this)
	241	{
	242	return (this->next_payload);
	243	}
	244
	245	/**
3fe05870	246	* Implementation of payload_t.get_length.
b860cffd JH	247	*/
	248	static size_t get_length(private_transform_substructure_t *this)
	249	{
b3fd2b72	250	this->compute_length(this);
f3c01a28	251
b860cffd JH	252	return this->transform_length;
	253	}
	254
	255	/**
3fe05870	256	* Implementation of transform_substructure_t.create_transform_attribute_iterator.
b860cffd	257	*/
a0753941	258	static iterator_t create_transform_attribute_iterator (private_transform_substructure_t this,bool forward)
b860cffd	259	{
a0753941	260	return this->attributes->create_iterator(this->attributes,forward);
b860cffd JH	261	}
	262
	263	/**
3fe05870	264	* Implementation of transform_substructure_t.add_transform_attribute.
b860cffd	265	*/
3fe05870	266	static void add_transform_attribute (private_transform_substructure_t this,transform_attribute_t attribute)
b860cffd	267	{
3fe05870	268	this->attributes->insert_last(this->attributes,(void *) attribute);
b3fd2b72	269	this->compute_length(this);
f3c01a28 JH	270	}
	271
	272	/**
3fe05870	273	* Implementation of transform_substructure_t.set_is_last_transform.
f3c01a28	274	*/
3fe05870	275	static void set_is_last_transform (private_transform_substructure_t *this, bool is_last)
f3c01a28	276	{
a14dffd1	277	this->next_payload = (is_last) ? 0: TRANSFORM_TYPE_VALUE;
f3c01a28 JH	278	}
	279
	280	/**
3fe05870	281	* Implementation of transform_substructure_t.get_is_last_transform.
f3c01a28 JH	282	*/
	283	static bool get_is_last_transform (private_transform_substructure_t *this)
	284	{
	285	return ((this->next_payload == TRANSFORM_TYPE_VALUE) ? FALSE : TRUE);
	286	}
	287
32cbc7bc	288	/**
3fe05870	289	* Implementation of payload_t.set_next_type.
32cbc7bc	290	*/
3fe05870	291	static void set_next_type(private_transform_substructure_t *this,payload_type_t type)
32cbc7bc	292	{
32cbc7bc JH	293	}
32cbc7bc JH	294
f3c01a28	295	/**
3fe05870	296	* Implementation of transform_substructure_t.set_transform_type.
f3c01a28	297	*/
3fe05870	298	static void set_transform_type (private_transform_substructure_t *this,u_int8_t type)
f3c01a28 JH	299	{
f3c01a28 JH	300	this->transform_type = type;
f3c01a28 JH	301	}
	302
	303	/**
3fe05870	304	* Implementation of transform_substructure_t.get_transform_type.
f3c01a28 JH	305	*/
	306	static u_int8_t get_transform_type (private_transform_substructure_t *this)
	307	{
	308	return this->transform_type;
b860cffd JH	309	}
b860cffd JH	310
f3c01a28	311	/**
3fe05870	312	* Implementation of transform_substructure_t.set_transform_id.
f3c01a28	313	*/
3fe05870	314	static void set_transform_id (private_transform_substructure_t *this,u_int16_t id)
f3c01a28 JH	315	{
f3c01a28 JH	316	this->transform_id = id;
f3c01a28 JH	317	}
	318
	319	/**
3fe05870	320	* Implementation of transform_substructure_t.get_transform_id.
f3c01a28 JH	321	*/
	322	static u_int16_t get_transform_id (private_transform_substructure_t *this)
	323	{
	324	return this->transform_id;
	325	}
b860cffd	326
b3fd2b72	327	/**
3fe05870	328	* Implementation of private_transform_substructure_t.compute_length.
b3fd2b72	329	*/
3fe05870	330	static void compute_length (private_transform_substructure_t *this)
b3fd2b72	331	{
bdb141cb	332	iterator_t *iterator;
b3fd2b72	333	size_t length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
a0753941	334	iterator = this->attributes->create_iterator(this->attributes,TRUE);
b3fd2b72 JH	335	while (iterator->has_next(iterator))
	336	{
	337	payload_t * current_attribute;
	338	iterator->current(iterator,(void **) &current_attribute);
	339	length += current_attribute->get_length(current_attribute);
	340	}
a14dffd1	341	iterator->destroy(iterator);
32cbc7bc JH	342
32cbc7bc JH	343	this->transform_length = length;
b3fd2b72 JH	344	}
b3fd2b72 JH	345
b9459040	346	/**
3fe05870	347	* Implementation of transform_substructure_t.clone.
b9459040	348	*/
a0753941	349	static transform_substructure_t clone(private_transform_substructure_t this)
b9459040 JH	350	{
b9459040 JH	351	private_transform_substructure_t *new_clone;
bdb141cb	352	iterator_t *attributes;
b9459040 JH	353
	354	new_clone = (private_transform_substructure_t *) transform_substructure_create();
	355
	356	new_clone->next_payload = this->next_payload;
	357	new_clone->transform_type = this->transform_type;
	358	new_clone->transform_id = this->transform_id;
	359
a0753941	360	attributes = this->attributes->create_iterator(this->attributes,FALSE);
b9459040 JH	361
	362	while (attributes->has_next(attributes))
	363	{
	364	transform_attribute_t *current_attribute;
	365	transform_attribute_t *current_attribute_clone;
3fe05870 JH	366	attributes->current(attributes,(void **) &current_attribute);
3fe05870 JH	367
a0753941	368	current_attribute_clone = current_attribute->clone(current_attribute);
b9459040	369
3fe05870	370	new_clone->public.add_transform_attribute(&(new_clone->public),current_attribute_clone);
b9459040 JH	371	}
	372
	373	attributes->destroy(attributes);
	374
a0753941	375	return &(new_clone->public);
b9459040 JH	376	}
	377
	378
b9d9f188 JH	379	/**
	380	* Implementation of transform_substructure_t.get_key_length.
	381	*/
	382	static status_t get_key_length(private_transform_substructure_t this, u_int16_t key_length)
	383	{
	384	iterator_t *attributes;
b9d9f188	385
a0753941	386	attributes = this->attributes->create_iterator(this->attributes,TRUE);
3fe05870	387
b9d9f188 JH	388	while (attributes->has_next(attributes))
	389	{
	390	transform_attribute_t *current_attribute;
3fe05870 JH	391	attributes->current(attributes,(void **) &current_attribute);
3fe05870 JH	392
b9d9f188 JH	393	if (current_attribute->get_attribute_type(current_attribute) == KEY_LENGTH)
	394	{
	395	*key_length = current_attribute->get_value(current_attribute);
	396	attributes->destroy(attributes);
	397	return SUCCESS;
	398	}
	399
	400	}
	401	attributes->destroy(attributes);
	402
	403	return FAILED;
	404	}
	405
	406
b9459040	407	/**
3fe05870	408	* Implementation of transform_substructure_t.destroy and payload_t.destroy.
b9459040	409	*/
3fe05870	410	static void destroy(private_transform_substructure_t *this)
b9459040 JH	411	{
	412	/* all proposals are getting destroyed */
	413	while (this->attributes->get_count(this->attributes) > 0)
	414	{
	415	transform_attribute_t *current_attribute;
3fe05870	416	this->attributes->remove_last(this->attributes,(void **)&current_attribute);
b9459040 JH	417	current_attribute->destroy(current_attribute);
	418	}
	419	this->attributes->destroy(this->attributes);
	420
5113680f	421	free(this);
b9459040 JH	422	}
b9459040 JH	423
b860cffd	424	/*
b737e9d9	425	* Described in header.
b860cffd JH	426	*/
	427	transform_substructure_t *transform_substructure_create()
	428	{
5113680f	429	private_transform_substructure_t *this = malloc_thing(private_transform_substructure_t);
3fe05870	430
e31eb71e JH	431	/* payload interface */
e31eb71e JH	432	this->public.payload_interface.verify = (status_t () (payload_t ))verify;
3fe05870	433	this->public.payload_interface.get_encoding_rules = (void () (payload_t , encoding_rule_t *, size_t ) ) get_encoding_rules;
b860cffd JH	434	this->public.payload_interface.get_length = (size_t () (payload_t )) get_length;
b860cffd JH	435	this->public.payload_interface.get_next_type = (payload_type_t () (payload_t )) get_next_type;
3fe05870	436	this->public.payload_interface.set_next_type = (void () (payload_t ,payload_type_t)) set_next_type;
b860cffd	437	this->public.payload_interface.get_type = (payload_type_t () (payload_t )) get_type;
3fe05870	438	this->public.payload_interface.destroy = (void () (payload_t ))destroy;
e31eb71e JH	439
e31eb71e JH	440	/* public functions */
a0753941	441	this->public.create_transform_attribute_iterator = (iterator_t * () (transform_substructure_t ,bool)) create_transform_attribute_iterator;
3fe05870 JH	442	this->public.add_transform_attribute = (void () (transform_substructure_t ,transform_attribute_t *)) add_transform_attribute;
3fe05870 JH	443	this->public.set_is_last_transform = (void () (transform_substructure_t ,bool)) set_is_last_transform;
f3c01a28	444	this->public.get_is_last_transform = (bool () (transform_substructure_t )) get_is_last_transform;
3fe05870	445	this->public.set_transform_type = (void () (transform_substructure_t ,u_int8_t)) set_transform_type;
f3c01a28	446	this->public.get_transform_type = (u_int8_t () (transform_substructure_t )) get_transform_type;
3fe05870	447	this->public.set_transform_id = (void () (transform_substructure_t ,u_int16_t)) set_transform_id;
f3c01a28	448	this->public.get_transform_id = (u_int16_t () (transform_substructure_t )) get_transform_id;
b9d9f188	449	this->public.get_key_length = (status_t () (transform_substructure_t ,u_int16_t *)) get_key_length;
a0753941	450	this->public.clone = (transform_substructure_t* () (transform_substructure_t )) clone;
3fe05870	451	this->public.destroy = (void () (transform_substructure_t )) destroy;
b860cffd	452
b3fd2b72 JH	453	/* private functions */
	454	this->compute_length = compute_length;
	455
b860cffd JH	456	/* set default values of the fields */
b860cffd JH	457	this->next_payload = NO_PAYLOAD;
f3c01a28	458	this->transform_length = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
b860cffd JH	459	this->transform_id = 0;
b860cffd JH	460	this->transform_type = 0;
b860cffd JH	461	this->attributes = linked_list_create();
b860cffd JH	462
b860cffd JH	463	return (&(this->public));
b860cffd JH	464	}
b737e9d9 JH	465
	466	/*
	467	* Described in header
	468	*/
	469	transform_substructure_t *transform_substructure_create_type(transform_type_t transform_type, u_int16_t transform_id, u_int16_t key_length)
	470	{
	471	transform_substructure_t *transform = transform_substructure_create();
	472
	473	transform->set_transform_type(transform,transform_type);
	474	transform->set_transform_id(transform,transform_id);
	475
30b5b412 MW	476	/* a keylength attribute is only created for AES encryption */
	477	if (transform_type == ENCRYPTION_ALGORITHM &&
	478	transform_id == ENCR_AES_CBC)
b737e9d9	479	{
30b5b412 MW	480	transform_attribute_t *attribute = transform_attribute_create_key_length(key_length);
	481	transform->add_transform_attribute(transform,attribute);
	482	}
	483
b737e9d9 JH	484	return transform;
b737e9d9 JH	485	}