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Sourcecode: ipsec-tools version File versions

algorithm.c

/* $Id: algorithm.c,v 1.11 2004/10/24 17:36:46 manubsd Exp $ */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "config.h"

#include <sys/param.h>
#include <sys/types.h>
#include <stdlib.h>

#include "var.h"
#include "misc.h"
#include "vmbuf.h"
#include "plog.h"
#include "debug.h"

#include "crypto_openssl.h"
#include "dhgroup.h"
#include "algorithm.h"
#include "oakley.h"
#include "isakmp_var.h"
#include "isakmp.h"
#include "ipsec_doi.h"
#include "gcmalloc.h"

static struct hash_algorithm oakley_hashdef[] = {
{ "md5",    algtype_md5,            OAKLEY_ATTR_HASH_ALG_MD5,
            eay_md5_init,           eay_md5_update,
            eay_md5_final,          eay_md5_hashlen,
            eay_md5_one, },
{ "sha1",   algtype_sha1,           OAKLEY_ATTR_HASH_ALG_SHA,
            eay_sha1_init,          eay_sha1_update,
            eay_sha1_final,         eay_sha1_hashlen,
            eay_sha1_one, },
#ifdef WITH_SHA2
{ "sha2_256",     algtype_sha2_256, OAKLEY_ATTR_HASH_ALG_SHA2_256,
            eay_sha2_256_init,      eay_sha2_256_update,
            eay_sha2_256_final,     eay_sha2_256_hashlen,
            eay_sha2_256_one, },
{ "sha2_384",     algtype_sha2_384, OAKLEY_ATTR_HASH_ALG_SHA2_384,
            eay_sha2_384_init,      eay_sha2_384_update,
            eay_sha2_384_final,     eay_sha2_384_hashlen,
            eay_sha2_384_one, },
{ "sha2_512",     algtype_sha2_512, OAKLEY_ATTR_HASH_ALG_SHA2_512,
            eay_sha2_512_init,      eay_sha2_512_update,
            eay_sha2_512_final,     eay_sha2_512_hashlen,
            eay_sha2_512_one, },
#endif
};

static struct hmac_algorithm oakley_hmacdef[] = {
{ "hmac_md5",     algtype_md5,            OAKLEY_ATTR_HASH_ALG_MD5,
            eay_hmacmd5_init, eay_hmacmd5_update,
            eay_hmacmd5_final,      NULL,
            eay_hmacmd5_one, },
{ "hmac_sha1",    algtype_sha1,           OAKLEY_ATTR_HASH_ALG_SHA,
            eay_hmacsha1_init,      eay_hmacsha1_update,
            eay_hmacsha1_final,     NULL,
            eay_hmacsha1_one, },
#ifdef WITH_SHA2
{ "hmac_sha2_256",      algtype_sha2_256, OAKLEY_ATTR_HASH_ALG_SHA2_256,
            eay_hmacsha2_256_init,  eay_hmacsha2_256_update,
            eay_hmacsha2_256_final, NULL,
            eay_hmacsha2_256_one, },
{ "hmac_sha2_384",      algtype_sha2_384, OAKLEY_ATTR_HASH_ALG_SHA2_384,
            eay_hmacsha2_384_init,  eay_hmacsha2_384_update,
            eay_hmacsha2_384_final, NULL,
            eay_hmacsha2_384_one, },
{ "hmac_sha2_512",      algtype_sha2_512, OAKLEY_ATTR_HASH_ALG_SHA2_512,
            eay_hmacsha2_512_init,  eay_hmacsha2_512_update,
            eay_hmacsha2_512_final, NULL,
            eay_hmacsha2_512_one, },
#endif
};

static struct enc_algorithm oakley_encdef[] = {
{ "des",    algtype_des,            OAKLEY_ATTR_ENC_ALG_DES,      8,
            eay_des_encrypt,  eay_des_decrypt,
            eay_des_weakkey,  eay_des_keylen, },
#ifdef HAVE_OPENSSL_IDEA_H
{ "idea",   algtype_idea,           OAKLEY_ATTR_ENC_ALG_IDEA,     8,
            eay_idea_encrypt, eay_idea_decrypt,
            eay_idea_weakkey, eay_idea_keylen, },
#endif
{ "blowfish",     algtype_blowfish, OAKLEY_ATTR_ENC_ALG_BLOWFISH, 8,
            eay_bf_encrypt,         eay_bf_decrypt,
            eay_bf_weakkey,         eay_bf_keylen, },
#ifdef HAVE_OPENSSL_RC5_H
{ "rc5",    algtype_rc5,            OAKLEY_ATTR_ENC_ALG_RC5,      8,
            eay_rc5_encrypt,  eay_rc5_decrypt,
            eay_rc5_weakkey,  eay_rc5_keylen, },
#endif
{ "3des",   algtype_3des,           OAKLEY_ATTR_ENC_ALG_3DES,     8,
            eay_3des_encrypt, eay_3des_decrypt,
            eay_3des_weakkey, eay_3des_keylen, },
{ "cast",   algtype_cast128,  OAKLEY_ATTR_ENC_ALG_CAST,     8,
            eay_cast_encrypt, eay_cast_decrypt,
            eay_cast_weakkey, eay_cast_keylen, },
{ "aes",    algtype_aes,      OAKLEY_ATTR_ENC_ALG_AES,      16,
            eay_aes_encrypt,  eay_aes_decrypt,
            eay_aes_weakkey,  eay_aes_keylen, },
};

static struct enc_algorithm ipsec_encdef[] = {
{ "des-iv64",     algtype_des_iv64, IPSECDOI_ESP_DES_IV64,        8,
            NULL,             NULL,
            NULL,             eay_des_keylen, },
{ "des",    algtype_des,            IPSECDOI_ESP_DES,       8,
            NULL,             NULL,
            NULL,             eay_des_keylen, },
{ "3des",   algtype_3des,           IPSECDOI_ESP_3DES,            8,
            NULL,             NULL,
            NULL,             eay_3des_keylen, },
#ifdef HAVE_OPENSSL_RC5_H
{ "rc5",    algtype_rc5,            IPSECDOI_ESP_RC5,       8,
            NULL,             NULL,
            NULL,             eay_rc5_keylen, },
#endif
{ "cast",   algtype_cast128,  IPSECDOI_ESP_CAST,            8,
            NULL,             NULL,
            NULL,             eay_cast_keylen, },
{ "blowfish",     algtype_blowfish, IPSECDOI_ESP_BLOWFISH,        8,
            NULL,             NULL,
            NULL,             eay_bf_keylen, },
{ "des-iv32",     algtype_des_iv32, IPSECDOI_ESP_DES_IV32,        8,
            NULL,             NULL,
            NULL,             eay_des_keylen, },
{ "null",   algtype_null_enc, IPSECDOI_ESP_NULL,            8,
            NULL,             NULL,
            NULL,             eay_null_keylen, },
{ "aes",    algtype_aes,            IPSECDOI_ESP_AES,       16,
            NULL,             NULL,
            NULL,             eay_aes_keylen, },
{ "twofish",      algtype_twofish,  IPSECDOI_ESP_TWOFISH,         16,
            NULL,             NULL,
            NULL,             eay_twofish_keylen, },
#ifdef HAVE_OPENSSL_IDEA_H
{ "3idea",  algtype_3idea,          IPSECDOI_ESP_3IDEA,           8,
            NULL,             NULL,
            NULL,             NULL, },
{ "idea",   algtype_idea,           IPSECDOI_ESP_IDEA,            8,
            NULL,             NULL,
            NULL,             NULL, },
#endif
{ "rc4",    algtype_rc4,            IPSECDOI_ESP_RC4,       8,
            NULL,             NULL,
            NULL,             NULL, },
};

static struct hmac_algorithm ipsec_hmacdef[] = {
{ "md5",    algtype_hmac_md5, IPSECDOI_ATTR_AUTH_HMAC_MD5,
            NULL,             NULL,
            NULL,             eay_md5_hashlen,
            NULL, },
{ "sha1",   algtype_hmac_sha1,      IPSECDOI_ATTR_AUTH_HMAC_SHA1,
            NULL,             NULL,
            NULL,             eay_sha1_hashlen,
            NULL, },
{ "kpdk",   algtype_kpdk,           IPSECDOI_ATTR_AUTH_KPDK,
            NULL,             NULL,
            NULL,             eay_kpdk_hashlen,
            NULL, },
{ "null",   algtype_non_auth, IPSECDOI_ATTR_AUTH_NONE,
            NULL,             NULL,
            NULL,             eay_null_hashlen,
            NULL, },
#ifdef WITH_SHA2
{ "hmac_sha2_256",      algtype_hmac_sha2_256,  IPSECDOI_ATTR_SHA2_256,
            NULL,             NULL,
            NULL,             eay_sha2_256_hashlen,
            NULL, },
{ "hmac_sha2_384",      algtype_hmac_sha2_384,  IPSECDOI_ATTR_SHA2_384,
            NULL,             NULL,
            NULL,             eay_sha2_384_hashlen,
            NULL, },
{ "hmac_sha2_512",      algtype_hmac_sha2_512,  IPSECDOI_ATTR_SHA2_512,
            NULL,             NULL,
            NULL,             eay_sha2_512_hashlen,
            NULL, },
#endif
};

static struct misc_algorithm ipsec_compdef[] = {
{ "oui",    algtype_oui,            IPSECDOI_IPCOMP_OUI, },
{ "deflate",      algtype_deflate,  IPSECDOI_IPCOMP_DEFLATE, },
{ "lzs",    algtype_lzs,            IPSECDOI_IPCOMP_LZS, },
};

static struct misc_algorithm oakley_authdef[] = {
{ "pre_shared_key",     algtype_psk,            OAKLEY_ATTR_AUTH_METHOD_PSKEY, },
{ "dsssig", algtype_dsssig,         OAKLEY_ATTR_AUTH_METHOD_DSSSIG, },
{ "rsasig", algtype_rsasig,         OAKLEY_ATTR_AUTH_METHOD_RSASIG, },
{ "rsaenc", algtype_rsaenc,         OAKLEY_ATTR_AUTH_METHOD_RSAENC, },
{ "rsarev", algtype_rsarev,         OAKLEY_ATTR_AUTH_METHOD_RSAREV, },
{ "gssapi_krb",   algtype_gssapikrb,      OAKLEY_ATTR_AUTH_METHOD_GSSAPI_KRB, },
#ifdef ENABLE_HYBRID
{ "hybrid_rsa_server",        algtype_hybrid_rsa_s,
      OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_I, },
{ "hybrid_dss_server",        algtype_hybrid_dss_s,
      OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_I, },
{ "hybrid_rsa_client",        algtype_hybrid_rsa_c,
      OAKLEY_ATTR_AUTH_METHOD_HYBRID_RSA_R, },
{ "hybrid_dss_client",        algtype_hybrid_dss_c,
      OAKLEY_ATTR_AUTH_METHOD_HYBRID_DSS_R, },
#endif
};

static struct dh_algorithm oakley_dhdef[] = {
{ "modp768",      algtype_modp768,  OAKLEY_ATTR_GRP_DESC_MODP768,
            &dh_modp768, },
{ "modp1024",     algtype_modp1024, OAKLEY_ATTR_GRP_DESC_MODP1024,
            &dh_modp1024, },
{ "modp1536",     algtype_modp1536, OAKLEY_ATTR_GRP_DESC_MODP1536,
            &dh_modp1536, },
{ "modp2048",     algtype_modp2048, OAKLEY_ATTR_GRP_DESC_MODP2048,
            &dh_modp2048, },
{ "modp3072",     algtype_modp3072, OAKLEY_ATTR_GRP_DESC_MODP3072,
            &dh_modp3072, },
{ "modp4096",     algtype_modp4096, OAKLEY_ATTR_GRP_DESC_MODP4096,
            &dh_modp4096, },
{ "modp6144",     algtype_modp6144, OAKLEY_ATTR_GRP_DESC_MODP6144,
            &dh_modp6144, },
{ "modp8192",     algtype_modp8192, OAKLEY_ATTR_GRP_DESC_MODP8192,
            &dh_modp8192, },
};

static struct hash_algorithm *alg_oakley_hashdef __P((int));
static struct hmac_algorithm *alg_oakley_hmacdef __P((int));
static struct enc_algorithm *alg_oakley_encdef __P((int));
static struct enc_algorithm *alg_ipsec_encdef __P((int));
static struct hmac_algorithm *alg_ipsec_hmacdef __P((int));
static struct dh_algorithm *alg_oakley_dhdef __P((int));

/* oakley hash algorithm */
static struct hash_algorithm *
alg_oakley_hashdef(doi)
      int doi;
{
      int i;

      for (i = 0; i < ARRAYLEN(oakley_hashdef); i++)
            if (doi == oakley_hashdef[i].doi) {
                  plog(LLV_DEBUG, LOCATION, NULL, "hash(%s)\n",
                        oakley_hashdef[i].name);
                  return &oakley_hashdef[i];
            }
      return NULL;
}

int
alg_oakley_hashdef_ok(doi)
      int doi;
{
      struct hash_algorithm *f;

      f = alg_oakley_hashdef(doi);
      if (f == NULL)
            return 0;

      return 1;
}

int
alg_oakley_hashdef_doi(type)
      int type;
{
      int i, res = -1;

      for (i = 0; i < ARRAYLEN(oakley_hashdef); i++)
            if (type == oakley_hashdef[i].type) {
                  res = oakley_hashdef[i].doi;
                  break;
            }
      return res;
}

int
alg_oakley_hashdef_hashlen(doi)
      int doi;
{
      struct hash_algorithm *f;

      f = alg_oakley_hashdef(doi);
      if (f == NULL || f->hashlen == NULL)
            return 0;

      return (f->hashlen)();
}

const char *
alg_oakley_hashdef_name (doi)
      int doi;
{
      struct hash_algorithm *f;

      f = alg_oakley_hashdef(doi);
      if (f == NULL)
            return "*UNKNOWN*";

      return f->name;
}

vchar_t *
alg_oakley_hashdef_one(doi, buf)
      int doi;
      vchar_t *buf;
{
      struct hash_algorithm *f;

      f = alg_oakley_hashdef(doi);
      if (f == NULL || f->hashlen == NULL)
            return NULL;

      return (f->one)(buf);
}

/* oakley hmac algorithm */
static struct hmac_algorithm *
alg_oakley_hmacdef(doi)
      int doi;
{
      int i;

      for (i = 0; i < ARRAYLEN(oakley_hmacdef); i++)
            if (doi == oakley_hmacdef[i].doi) {
                  plog(LLV_DEBUG, LOCATION, NULL, "hmac(%s)\n",
                        oakley_hmacdef[i].name);
                  return &oakley_hmacdef[i];
            }
      return NULL;
}

int
alg_oakley_hmacdef_doi(type)
      int type;
{
      int i, res = -1;

      for (i = 0; i < ARRAYLEN(oakley_hmacdef); i++)
            if (type == oakley_hmacdef[i].type) {
                  res = oakley_hmacdef[i].doi;
                  break;
            }
      return res;
}

vchar_t *
alg_oakley_hmacdef_one(doi, key, buf)
      int doi;
      vchar_t *key, *buf;
{
      struct hmac_algorithm *f;
      vchar_t *res;
#ifdef ENABLE_STATS
      struct timeval start, end;
#endif

      f = alg_oakley_hmacdef(doi);
      if (f == NULL || f->one == NULL)
            return NULL;

#ifdef ENABLE_STATS
      gettimeofday(&start, NULL);
#endif

      res = (f->one)(key, buf);

#ifdef ENABLE_STATS
      gettimeofday(&end, NULL);
      syslog(LOG_NOTICE, "%s(%s size=%d): %8.6f", __func__,
            f->name, buf->l, timedelta(&start, &end));
#endif

      return res;
}

/* oakley encryption algorithm */
static struct enc_algorithm *
alg_oakley_encdef(doi)
      int doi;
{
      int i;

      for (i = 0; i < ARRAYLEN(oakley_encdef); i++)
            if (doi == oakley_encdef[i].doi) {
                  plog(LLV_DEBUG, LOCATION, NULL, "encryption(%s)\n",
                        oakley_encdef[i].name);
                  return &oakley_encdef[i];
            }
      return NULL;
}

int
alg_oakley_encdef_ok(doi)
      int doi;
{
      struct enc_algorithm *f;

      f = alg_oakley_encdef(doi);
      if (f == NULL)
            return 0;

      return 1;
}

int
alg_oakley_encdef_doi(type)
      int type;
{
      int i, res = -1;

      for (i = 0; i < ARRAYLEN(oakley_encdef); i++)
            if (type == oakley_encdef[i].type) {
                  res = oakley_encdef[i].doi;
                  break;
            }
      return res;
}

int
alg_oakley_encdef_keylen(doi, len)
      int doi, len;
{
      struct enc_algorithm *f;

      f = alg_oakley_encdef(doi);
      if (f == NULL || f->keylen == NULL)
            return -1;

      return (f->keylen)(len);
}

int
alg_oakley_encdef_blocklen(doi)
      int doi;
{
      struct enc_algorithm *f;

      f = alg_oakley_encdef(doi);
      if (f == NULL)
            return -1;

      return f->blocklen;
}

const char *
alg_oakley_encdef_name (doi)
      int doi;
{
      struct enc_algorithm *f;

      f = alg_oakley_encdef(doi);
      if (f == NULL)
            return "*UNKNOWN*";

      return f->name;
}

vchar_t *
alg_oakley_encdef_decrypt(doi, buf, key, iv)
      int doi;
      vchar_t *buf, *key, *iv;
{
      vchar_t *res;
      struct enc_algorithm *f;
#ifdef ENABLE_STATS
      struct timeval start, end;
#endif

      f = alg_oakley_encdef(doi);
      if (f == NULL || f->decrypt == NULL)
            return NULL;

#ifdef ENABLE_STATS
      gettimeofday(&start, NULL);
#endif

      res = (f->decrypt)(buf, key, iv);

#ifdef ENABLE_STATS
      gettimeofday(&end, NULL);
      syslog(LOG_NOTICE, "%s(%s klen=%d size=%d): %8.6f", __func__,
            f->name, key->l << 3, buf->l, timedelta(&start, &end));
#endif
      return res;
}

vchar_t *
alg_oakley_encdef_encrypt(doi, buf, key, iv)
      int doi;
      vchar_t *buf, *key, *iv;
{
      vchar_t *res;
      struct enc_algorithm *f;
#ifdef ENABLE_STATS
      struct timeval start, end;
#endif

      f = alg_oakley_encdef(doi);
      if (f == NULL || f->encrypt == NULL)
            return NULL;

#ifdef ENABLE_STATS
      gettimeofday(&start, NULL);
#endif

      res = (f->encrypt)(buf, key, iv);

#ifdef ENABLE_STATS
      gettimeofday(&end, NULL);
      syslog(LOG_NOTICE, "%s(%s klen=%d size=%d): %8.6f", __func__,
            f->name, key->l << 3, buf->l, timedelta(&start, &end));
#endif
      return res;
}

/* ipsec encryption algorithm */
static struct enc_algorithm *
alg_ipsec_encdef(doi)
      int doi;
{
      int i;

      for (i = 0; i < ARRAYLEN(ipsec_encdef); i++)
            if (doi == ipsec_encdef[i].doi) {
                  plog(LLV_DEBUG, LOCATION, NULL, "encryption(%s)\n",
                        ipsec_encdef[i].name);
                  return &ipsec_encdef[i];
            }
      return NULL;
}

int
alg_ipsec_encdef_doi(type)
      int type;
{
      int i, res = -1;

      for (i = 0; i < ARRAYLEN(ipsec_encdef); i++)
            if (type == ipsec_encdef[i].type) {
                  res = ipsec_encdef[i].doi;
                  break;
            }
      return res;
}

int
alg_ipsec_encdef_keylen(doi, len)
      int doi, len;
{
      struct enc_algorithm *f;

      f = alg_ipsec_encdef(doi);
      if (f == NULL || f->keylen == NULL)
            return -1;

      return (f->keylen)(len);
}

/* ipsec hmac algorithm */
static struct hmac_algorithm *
alg_ipsec_hmacdef(doi)
      int doi;
{
      int i;

      for (i = 0; i < ARRAYLEN(ipsec_hmacdef); i++)
            if (doi == ipsec_hmacdef[i].doi) {
                  plog(LLV_DEBUG, LOCATION, NULL, "hmac(%s)\n",
                        oakley_hmacdef[i].name);
                  return &ipsec_hmacdef[i];
            }
      return NULL;
}

int
alg_ipsec_hmacdef_doi(type)
      int type;
{
      int i, res = -1;

      for (i = 0; i < ARRAYLEN(ipsec_hmacdef); i++)
            if (type == ipsec_hmacdef[i].type) {
                  res = ipsec_hmacdef[i].doi;
                  break;
            }
      return res;
}

int
alg_ipsec_hmacdef_hashlen(doi)
      int doi;
{
      struct hmac_algorithm *f;

      f = alg_ipsec_hmacdef(doi);
      if (f == NULL || f->hashlen == NULL)
            return -1;

      return (f->hashlen)();
}

/* ip compression */
int
alg_ipsec_compdef_doi(type)
      int type;
{
      int i, res = -1;

      for (i = 0; i < ARRAYLEN(ipsec_compdef); i++)
            if (type == ipsec_compdef[i].type) {
                  res = ipsec_compdef[i].doi;
                  break;
            }
      return res;
}

/* dh algorithm */
static struct dh_algorithm *
alg_oakley_dhdef(doi)
      int doi;
{
      int i;

      for (i = 0; i < ARRAYLEN(oakley_dhdef); i++)
            if (doi == oakley_dhdef[i].doi) {
                  plog(LLV_DEBUG, LOCATION, NULL, "hmac(%s)\n",
                        oakley_dhdef[i].name);
                  return &oakley_dhdef[i];
            }
      return NULL;
}

int
alg_oakley_dhdef_ok(doi)
      int doi;
{
      struct dh_algorithm *f;

      f = alg_oakley_dhdef(doi);
      if (f == NULL)
            return 0;

      return 1;
}

int
alg_oakley_dhdef_doi(type)
      int type;
{
      int i, res = -1;

      for (i = 0; i < ARRAYLEN(oakley_dhdef); i++)
            if (type == oakley_dhdef[i].type) {
                  res = oakley_dhdef[i].doi;
                  break;
            }
      return res;
}

struct dhgroup *
alg_oakley_dhdef_group(doi)
      int doi;
{
      struct dh_algorithm *f;

      f = alg_oakley_dhdef(doi);
      if (f == NULL || f->dhgroup == NULL)
            return NULL;

      return f->dhgroup;
}

const char *
alg_oakley_dhdef_name (doi)
      int doi;
{
      struct dh_algorithm *f;
      
      f = alg_oakley_dhdef(doi);
      if (f == NULL)
            return "*UNKNOWN*";
      return f->name;
}

/* authentication method */
int
alg_oakley_authdef_doi(type)
      int type;
{
      int i, res = -1;

      for (i = 0; i < ARRAYLEN(oakley_authdef); i++)
            if (type == oakley_authdef[i].type) {
                  res = oakley_authdef[i].doi;
                  break;
            }
      return res;
}

const char *
alg_oakley_authdef_name (doi)
      int doi;
{
      int i;

      for (i = 0; i < ARRAYLEN(oakley_authdef); i++)
            if (doi == oakley_authdef[i].doi) {
                  return oakley_authdef[i].name;
            }
      return "*UNKNOWN*";
}

/*
 * give the default key length
 * OUT:     -1:         NG
 *    0:          fixed key cipher, key length not allowed
 *    positive:   default key length
 */
int
default_keylen(class, type)
      int class, type;
{

      switch (class) {
      case algclass_isakmp_enc:
      case algclass_ipsec_enc:
            break;
      default:
            return 0;
      }

      switch (type) {
      case algtype_blowfish:
      case algtype_rc5:
      case algtype_cast128:
      case algtype_aes:
      case algtype_twofish:
            return 128;
      default:
            return 0;
      }
}

/*
 * check key length
 * OUT:     -1:   NG
 *    0:    OK
 */
int
check_keylen(class, type, len)
      int class, type, len;
{
      int badrange;

      switch (class) {
      case algclass_isakmp_enc:
      case algclass_ipsec_enc:
            break;
      default:
            /* unknown class, punt */
            plog(LLV_ERROR, LOCATION, NULL,
                  "unknown algclass %d\n", class);
            return -1;
      }

      /* key length must be multiple of 8 bytes - RFC2451 2.2 */
      switch (type) {
      case algtype_blowfish:
      case algtype_rc5:
      case algtype_cast128:
      case algtype_aes:
      case algtype_twofish:
            if (len % 8 != 0) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "key length %d is not multiple of 8\n", len);
                  return -1;
            }
            break;
      }

      /* key length range */
      badrange = 0;
      switch (type) {
      case algtype_blowfish:
            if (len < 40 || 448 < len)
                  badrange++;
            break;
      case algtype_rc5:
            if (len < 40 || 2040 < len)
                  badrange++;
            break;
      case algtype_cast128:
            if (len < 40 || 128 < len)
                  badrange++;
            break;
      case algtype_aes:
            if (!(len == 128 || len == 192 || len == 256))
                  badrange++;
            break;
      case algtype_twofish:
            if (len < 40 || 256 < len)
                  badrange++;
            break;
      default:
            if (len) {
                  plog(LLV_ERROR, LOCATION, NULL,
                        "key length is not allowed");
                  return -1;
            }
            break;
      }
      if (badrange) {
            plog(LLV_ERROR, LOCATION, NULL,
                  "key length out of range\n");
            return -1;
      }

      return 0;
}

/*
 * convert algorithm type to DOI value.
 * OUT      -1   : NG
 *    other: converted.
 */
int
algtype2doi(class, type)
      int class, type;
{
      int res = -1;

      switch (class) {
      case algclass_ipsec_enc:
            res = alg_ipsec_encdef_doi(type);
            break;
      case algclass_ipsec_auth:
            res = alg_ipsec_hmacdef_doi(type);
            break;
      case algclass_ipsec_comp:
            res = alg_ipsec_compdef_doi(type);
            break;
      case algclass_isakmp_enc:
            res =  alg_oakley_encdef_doi(type);
            break;
      case algclass_isakmp_hash:
            res = alg_oakley_hashdef_doi(type);
            break;
      case algclass_isakmp_dh:
            res = alg_oakley_dhdef_doi(type);
            break;
      case algclass_isakmp_ameth:
            res = alg_oakley_authdef_doi(type);
            break;
      }
      return res;
}

/*
 * convert algorithm class to DOI value.
 * OUT      -1   : NG
 *    other: converted.
 */
int
algclass2doi(class)
      int class;
{
      switch (class) {
      case algclass_ipsec_enc:
            return IPSECDOI_PROTO_IPSEC_ESP;
      case algclass_ipsec_auth:
            return IPSECDOI_ATTR_AUTH;
      case algclass_ipsec_comp:
            return IPSECDOI_PROTO_IPCOMP;
      case algclass_isakmp_enc:
            return OAKLEY_ATTR_ENC_ALG;
      case algclass_isakmp_hash:
            return OAKLEY_ATTR_HASH_ALG;
      case algclass_isakmp_dh:
            return OAKLEY_ATTR_GRP_DESC;
      case algclass_isakmp_ameth:
            return OAKLEY_ATTR_AUTH_METHOD;
      default:
            return -1;
      }
      /*NOTREACHED*/
      return -1;
}

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