149 lines
4.2 KiB
C
149 lines
4.2 KiB
C
/*
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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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/* Functions which are used by both single and triple DES enctypes */
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#include "krb5_locl.h"
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/*
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* A = A xor B. A & B are 8 bytes.
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*/
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void
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_krb5_xor (DES_cblock *key, const unsigned char *b)
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{
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unsigned char *a = (unsigned char*)key;
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a[0] ^= b[0];
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a[1] ^= b[1];
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a[2] ^= b[2];
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a[3] ^= b[3];
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a[4] ^= b[4];
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a[5] ^= b[5];
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a[6] ^= b[6];
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a[7] ^= b[7];
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}
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#if defined(DES3_OLD_ENCTYPE) || defined(HEIM_WEAK_CRYPTO)
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krb5_error_code
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_krb5_des_checksum(krb5_context context,
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const EVP_MD *evp_md,
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struct _krb5_key_data *key,
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const void *data,
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size_t len,
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Checksum *cksum)
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{
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struct _krb5_evp_schedule *ctx = key->schedule->data;
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EVP_MD_CTX *m;
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DES_cblock ivec;
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unsigned char *p = cksum->checksum.data;
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krb5_generate_random_block(p, 8);
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m = EVP_MD_CTX_create();
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if (m == NULL)
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return krb5_enomem(context);
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EVP_DigestInit_ex(m, evp_md, NULL);
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EVP_DigestUpdate(m, p, 8);
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EVP_DigestUpdate(m, data, len);
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EVP_DigestFinal_ex (m, p + 8, NULL);
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EVP_MD_CTX_destroy(m);
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memset (&ivec, 0, sizeof(ivec));
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EVP_CipherInit_ex(&ctx->ectx, NULL, NULL, NULL, (void *)&ivec, -1);
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EVP_Cipher(&ctx->ectx, p, p, 24);
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return 0;
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}
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krb5_error_code
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_krb5_des_verify(krb5_context context,
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const EVP_MD *evp_md,
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struct _krb5_key_data *key,
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const void *data,
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size_t len,
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Checksum *C)
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{
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struct _krb5_evp_schedule *ctx = key->schedule->data;
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EVP_MD_CTX *m;
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unsigned char tmp[24];
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unsigned char res[16];
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DES_cblock ivec;
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krb5_error_code ret = 0;
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m = EVP_MD_CTX_create();
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if (m == NULL)
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return krb5_enomem(context);
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memset(&ivec, 0, sizeof(ivec));
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EVP_CipherInit_ex(&ctx->dctx, NULL, NULL, NULL, (void *)&ivec, -1);
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EVP_Cipher(&ctx->dctx, tmp, C->checksum.data, 24);
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EVP_DigestInit_ex(m, evp_md, NULL);
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EVP_DigestUpdate(m, tmp, 8); /* confounder */
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EVP_DigestUpdate(m, data, len);
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EVP_DigestFinal_ex (m, res, NULL);
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EVP_MD_CTX_destroy(m);
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if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) {
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krb5_clear_error_message (context);
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ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
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}
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memset(tmp, 0, sizeof(tmp));
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memset(res, 0, sizeof(res));
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return ret;
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}
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#endif
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static krb5_error_code
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RSA_MD5_checksum(krb5_context context,
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struct _krb5_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 *C)
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{
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if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_md5(), NULL) != 1)
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krb5_abortx(context, "md5 checksum failed");
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return 0;
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}
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struct _krb5_checksum_type _krb5_checksum_rsa_md5 = {
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CKSUMTYPE_RSA_MD5,
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"rsa-md5",
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64,
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16,
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F_CPROOF,
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RSA_MD5_checksum,
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NULL
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};
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