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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/* lib/crypto/openssl/hash_provider/hash_evp.c - OpenSSL hash providers */
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/*
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* Copyright (C) 2015 by the Massachusetts Institute of Technology.
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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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* * 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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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "crypto_int.h"
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#include <openssl/evp.h>
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static krb5_error_code
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hash_evp(const EVP_MD *type, const krb5_crypto_iov *data, size_t num_data,
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krb5_data *output)
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{
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EVP_MD_CTX *ctx;
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const krb5_data *d;
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size_t i;
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int ok;
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if (output->length != (unsigned int)EVP_MD_size(type))
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return KRB5_CRYPTO_INTERNAL;
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ctx = EVP_MD_CTX_new();
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if (ctx == NULL)
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return ENOMEM;
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if (type == EVP_md4() || type == EVP_md5()) {
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/* See comments below in hash_md4() and hash_md5(). */
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EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
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}
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ok = EVP_DigestInit_ex(ctx, type, NULL);
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for (i = 0; i < num_data; i++) {
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if (!SIGN_IOV(&data[i]))
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continue;
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d = &data[i].data;
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ok = ok && EVP_DigestUpdate(ctx, d->data, d->length);
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}
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ok = ok && EVP_DigestFinal_ex(ctx, (uint8_t *)output->data, NULL);
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EVP_MD_CTX_free(ctx);
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return ok ? 0 : KRB5_CRYPTO_INTERNAL;
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}
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static krb5_error_code
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hash_md4(const krb5_crypto_iov *data, size_t num_data, krb5_data *output)
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{
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/*
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* MD4 is needed in FIPS mode to perform key generation for RC4 keys used
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* by IPA. These keys are only used along a (separately) secured channel
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* for legacy reasons when performing trusts to Active Directory.
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*/
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return hash_evp(EVP_md4(), data, num_data, output);
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}
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static krb5_error_code
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hash_md5(const krb5_crypto_iov *data, size_t num_data, krb5_data *output)
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{
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/* MD5 is needed in FIPS mode for communication with RADIUS servers. This
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* is gated in libkrad by libdefaults->radius_md5_fips_override. */
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return hash_evp(EVP_md5(), data, num_data, output);
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}
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static krb5_error_code
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hash_sha1(const krb5_crypto_iov *data, size_t num_data, krb5_data *output)
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{
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return hash_evp(EVP_sha1(), data, num_data, output);
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}
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static krb5_error_code
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hash_sha256(const krb5_crypto_iov *data, size_t num_data, krb5_data *output)
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{
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return hash_evp(EVP_sha256(), data, num_data, output);
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}
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static krb5_error_code
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hash_sha384(const krb5_crypto_iov *data, size_t num_data, krb5_data *output)
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{
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return hash_evp(EVP_sha384(), data, num_data, output);
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}
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const struct krb5_hash_provider krb5int_hash_md4 = {
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"MD4", 16, 64, hash_md4
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};
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const struct krb5_hash_provider krb5int_hash_md5 = {
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"MD5", 16, 64, hash_md5
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};
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const struct krb5_hash_provider krb5int_hash_sha1 = {
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"SHA1", 20, 64, hash_sha1
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};
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const struct krb5_hash_provider krb5int_hash_sha256 = {
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"SHA-256", 32, 64, hash_sha256
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};
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const struct krb5_hash_provider krb5int_hash_sha384 = {
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"SHA-384", 48, 128, hash_sha384
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};
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