krb5: reorganise crypto.c
lib/krb5/crypto.c was a large, monolithic block of code which made it very difficult to selectively enable and disable particular alogrithms. Reorganise crypto.c into individual files for each encryption and salt time, and place the structures which tie everything together into their own file (crypto-algs.c) Add a non-installed library (librfc3961) and test program (test_rfc3961) which builds a minimal rfc3961 crypto library, and checks that it is usable.
This commit is contained in:
Simon Wilkinson
committed by
Simon Wilkinson
Simon Wilkinson
parent
6184422fef
commit
1d9072f026
325
lib/krb5/crypto-arcfour.c
Normal file
325
lib/krb5/crypto-arcfour.c
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/*
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* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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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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*
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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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*
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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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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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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/*
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* ARCFOUR
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*/
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#include "krb5_locl.h"
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static struct key_type keytype_arcfour = {
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KEYTYPE_ARCFOUR,
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"arcfour",
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128,
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16,
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sizeof(struct evp_schedule),
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NULL,
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_krb5_evp_schedule,
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_krb5_arcfour_salt,
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NULL,
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_krb5_evp_cleanup,
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EVP_rc4
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};
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/*
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* checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
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*/
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static krb5_error_code
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HMAC_MD5_checksum(krb5_context context,
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struct key_data *key,
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const void *data,
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size_t len,
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unsigned usage,
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Checksum *result)
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{
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EVP_MD_CTX *m;
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struct checksum_type *c = _krb5_find_checksum (CKSUMTYPE_RSA_MD5);
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const char signature[] = "signaturekey";
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Checksum ksign_c;
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struct key_data ksign;
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krb5_keyblock kb;
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unsigned char t[4];
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unsigned char tmp[16];
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unsigned char ksign_c_data[16];
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krb5_error_code ret;
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m = EVP_MD_CTX_create();
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if (m == NULL) {
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krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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ksign_c.checksum.length = sizeof(ksign_c_data);
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ksign_c.checksum.data = ksign_c_data;
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ret = _krb5_internal_hmac(context, c, signature, sizeof(signature),
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0, key, &ksign_c);
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if (ret) {
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EVP_MD_CTX_destroy(m);
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return ret;
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}
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ksign.key = &kb;
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kb.keyvalue = ksign_c.checksum;
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EVP_DigestInit_ex(m, EVP_md5(), NULL);
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t[0] = (usage >> 0) & 0xFF;
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t[1] = (usage >> 8) & 0xFF;
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t[2] = (usage >> 16) & 0xFF;
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t[3] = (usage >> 24) & 0xFF;
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EVP_DigestUpdate(m, t, 4);
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EVP_DigestUpdate(m, data, len);
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EVP_DigestFinal_ex (m, tmp, NULL);
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EVP_MD_CTX_destroy(m);
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ret = _krb5_internal_hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
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if (ret)
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return ret;
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return 0;
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}
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struct checksum_type _krb5_checksum_hmac_md5 = {
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CKSUMTYPE_HMAC_MD5,
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"hmac-md5",
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64,
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16,
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F_KEYED | F_CPROOF,
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HMAC_MD5_checksum,
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NULL
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};
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/*
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* section 6 of draft-brezak-win2k-krb-rc4-hmac-03
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*
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* warning: not for small children
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*/
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static krb5_error_code
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ARCFOUR_subencrypt(krb5_context context,
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struct key_data *key,
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void *data,
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size_t len,
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unsigned usage,
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void *ivec)
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{
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EVP_CIPHER_CTX ctx;
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struct checksum_type *c = _krb5_find_checksum (CKSUMTYPE_RSA_MD5);
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Checksum k1_c, k2_c, k3_c, cksum;
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struct key_data ke;
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krb5_keyblock kb;
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unsigned char t[4];
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unsigned char *cdata = data;
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unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
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krb5_error_code ret;
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t[0] = (usage >> 0) & 0xFF;
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t[1] = (usage >> 8) & 0xFF;
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t[2] = (usage >> 16) & 0xFF;
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t[3] = (usage >> 24) & 0xFF;
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k1_c.checksum.length = sizeof(k1_c_data);
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k1_c.checksum.data = k1_c_data;
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ret = _krb5_internal_hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
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if (ret)
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krb5_abortx(context, "hmac failed");
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memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
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k2_c.checksum.length = sizeof(k2_c_data);
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k2_c.checksum.data = k2_c_data;
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ke.key = &kb;
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kb.keyvalue = k2_c.checksum;
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cksum.checksum.length = 16;
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cksum.checksum.data = data;
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ret = _krb5_internal_hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
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if (ret)
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krb5_abortx(context, "hmac failed");
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ke.key = &kb;
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kb.keyvalue = k1_c.checksum;
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k3_c.checksum.length = sizeof(k3_c_data);
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k3_c.checksum.data = k3_c_data;
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ret = _krb5_internal_hmac(NULL, c, data, 16, 0, &ke, &k3_c);
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if (ret)
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krb5_abortx(context, "hmac failed");
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EVP_CIPHER_CTX_init(&ctx);
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EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 1);
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EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
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EVP_CIPHER_CTX_cleanup(&ctx);
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memset (k1_c_data, 0, sizeof(k1_c_data));
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memset (k2_c_data, 0, sizeof(k2_c_data));
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memset (k3_c_data, 0, sizeof(k3_c_data));
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return 0;
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}
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static krb5_error_code
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ARCFOUR_subdecrypt(krb5_context context,
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struct key_data *key,
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void *data,
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size_t len,
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unsigned usage,
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void *ivec)
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{
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EVP_CIPHER_CTX ctx;
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struct checksum_type *c = _krb5_find_checksum (CKSUMTYPE_RSA_MD5);
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Checksum k1_c, k2_c, k3_c, cksum;
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struct key_data ke;
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krb5_keyblock kb;
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unsigned char t[4];
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unsigned char *cdata = data;
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unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
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unsigned char cksum_data[16];
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krb5_error_code ret;
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t[0] = (usage >> 0) & 0xFF;
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t[1] = (usage >> 8) & 0xFF;
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t[2] = (usage >> 16) & 0xFF;
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t[3] = (usage >> 24) & 0xFF;
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k1_c.checksum.length = sizeof(k1_c_data);
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k1_c.checksum.data = k1_c_data;
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ret = _krb5_internal_hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
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if (ret)
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krb5_abortx(context, "hmac failed");
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memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
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k2_c.checksum.length = sizeof(k2_c_data);
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k2_c.checksum.data = k2_c_data;
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ke.key = &kb;
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kb.keyvalue = k1_c.checksum;
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k3_c.checksum.length = sizeof(k3_c_data);
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k3_c.checksum.data = k3_c_data;
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ret = _krb5_internal_hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
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if (ret)
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krb5_abortx(context, "hmac failed");
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EVP_CIPHER_CTX_init(&ctx);
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EVP_CipherInit_ex(&ctx, EVP_rc4(), NULL, k3_c.checksum.data, NULL, 0);
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EVP_Cipher(&ctx, cdata + 16, cdata + 16, len - 16);
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EVP_CIPHER_CTX_cleanup(&ctx);
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ke.key = &kb;
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kb.keyvalue = k2_c.checksum;
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cksum.checksum.length = 16;
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cksum.checksum.data = cksum_data;
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ret = _krb5_internal_hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
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if (ret)
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krb5_abortx(context, "hmac failed");
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memset (k1_c_data, 0, sizeof(k1_c_data));
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memset (k2_c_data, 0, sizeof(k2_c_data));
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memset (k3_c_data, 0, sizeof(k3_c_data));
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if (ct_memcmp (cksum.checksum.data, data, 16) != 0) {
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krb5_clear_error_message (context);
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return KRB5KRB_AP_ERR_BAD_INTEGRITY;
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} else {
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return 0;
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}
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}
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/*
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* convert the usage numbers used in
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* draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
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* draft-brezak-win2k-krb-rc4-hmac-04.txt
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*/
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krb5_error_code
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_krb5_usage2arcfour(krb5_context context, unsigned *usage)
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{
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switch (*usage) {
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case KRB5_KU_AS_REP_ENC_PART : /* 3 */
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*usage = 8;
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return 0;
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case KRB5_KU_USAGE_SEAL : /* 22 */
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*usage = 13;
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return 0;
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case KRB5_KU_USAGE_SIGN : /* 23 */
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*usage = 15;
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return 0;
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case KRB5_KU_USAGE_SEQ: /* 24 */
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*usage = 0;
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return 0;
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default :
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return 0;
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}
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}
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static krb5_error_code
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ARCFOUR_encrypt(krb5_context context,
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struct key_data *key,
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void *data,
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size_t len,
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krb5_boolean encryptp,
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int usage,
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void *ivec)
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{
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krb5_error_code ret;
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unsigned keyusage = usage;
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if((ret = _krb5_usage2arcfour (context, &keyusage)) != 0)
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return ret;
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if (encryptp)
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return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
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else
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return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
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}
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struct encryption_type _krb5_enctype_arcfour_hmac_md5 = {
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ETYPE_ARCFOUR_HMAC_MD5,
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"arcfour-hmac-md5",
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1,
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1,
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8,
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&keytype_arcfour,
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&_krb5_checksum_hmac_md5,
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NULL,
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F_SPECIAL,
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ARCFOUR_encrypt,
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0,
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NULL
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};
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