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https://github.com/ClickHouse/ClickHouse.git
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303 lines
9.0 KiB
C
303 lines
9.0 KiB
C
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/* lib/crypto/openssl/enc_provider/aes.c */
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/*
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* Copyright (C) 2003, 2007, 2008, 2009 by the Massachusetts Institute of Technology.
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* All rights reserved.
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*
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* Export of this software from the United States of America may
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* require a specific license from the United States Government.
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* It is the responsibility of any person or organization contemplating
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* export to obtain such a license before exporting.
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*
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* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
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* distribute this software and its documentation for any purpose and
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* without fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright notice and
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* this permission notice appear in supporting documentation, and that
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* the name of M.I.T. not be used in advertising or publicity pertaining
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* to distribution of the software without specific, written prior
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* permission. Furthermore if you modify this software you must label
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* your software as modified software and not distribute it in such a
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* fashion that it might be confused with the original M.I.T. software.
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* M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*/
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#include "crypto_int.h"
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#include <openssl/evp.h>
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#include <openssl/aes.h>
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/* proto's */
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static krb5_error_code
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cbc_enc(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
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size_t num_data);
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static krb5_error_code
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cbc_decr(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
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size_t num_data);
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static krb5_error_code
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cts_encr(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
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size_t num_data, size_t dlen);
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static krb5_error_code
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cts_decr(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
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size_t num_data, size_t dlen);
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#define BLOCK_SIZE 16
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#define NUM_BITS 8
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#define IV_CTS_BUF_SIZE 16 /* 16 - hardcoded in CRYPTO_cts128_en/decrypt */
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static const EVP_CIPHER *
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map_mode(unsigned int len)
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{
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if (len==16)
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return EVP_aes_128_cbc();
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if (len==32)
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return EVP_aes_256_cbc();
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else
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return NULL;
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}
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/* Encrypt one block using CBC. */
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static krb5_error_code
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cbc_enc(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
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size_t num_data)
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{
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int ret, olen = BLOCK_SIZE;
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unsigned char iblock[BLOCK_SIZE], oblock[BLOCK_SIZE];
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EVP_CIPHER_CTX *ctx;
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struct iov_cursor cursor;
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ctx = EVP_CIPHER_CTX_new();
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if (ctx == NULL)
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return ENOMEM;
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ret = EVP_EncryptInit_ex(ctx, map_mode(key->keyblock.length),
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NULL, key->keyblock.contents, (ivec) ? (unsigned char*)ivec->data : NULL);
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if (ret == 0) {
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EVP_CIPHER_CTX_free(ctx);
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return KRB5_CRYPTO_INTERNAL;
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}
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k5_iov_cursor_init(&cursor, data, num_data, BLOCK_SIZE, FALSE);
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k5_iov_cursor_get(&cursor, iblock);
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EVP_CIPHER_CTX_set_padding(ctx,0);
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ret = EVP_EncryptUpdate(ctx, oblock, &olen, iblock, BLOCK_SIZE);
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if (ret == 1)
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k5_iov_cursor_put(&cursor, oblock);
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EVP_CIPHER_CTX_free(ctx);
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zap(iblock, BLOCK_SIZE);
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zap(oblock, BLOCK_SIZE);
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return (ret == 1) ? 0 : KRB5_CRYPTO_INTERNAL;
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}
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/* Decrypt one block using CBC. */
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static krb5_error_code
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cbc_decr(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
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size_t num_data)
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{
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int ret = 0, olen = BLOCK_SIZE;
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unsigned char iblock[BLOCK_SIZE], oblock[BLOCK_SIZE];
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EVP_CIPHER_CTX *ctx;
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struct iov_cursor cursor;
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ctx = EVP_CIPHER_CTX_new();
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if (ctx == NULL)
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return ENOMEM;
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ret = EVP_DecryptInit_ex(ctx, map_mode(key->keyblock.length),
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NULL, key->keyblock.contents, (ivec) ? (unsigned char*)ivec->data : NULL);
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if (ret == 0) {
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EVP_CIPHER_CTX_free(ctx);
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return KRB5_CRYPTO_INTERNAL;
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}
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k5_iov_cursor_init(&cursor, data, num_data, BLOCK_SIZE, FALSE);
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k5_iov_cursor_get(&cursor, iblock);
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EVP_CIPHER_CTX_set_padding(ctx,0);
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ret = EVP_DecryptUpdate(ctx, oblock, &olen, iblock, BLOCK_SIZE);
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if (ret == 1)
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k5_iov_cursor_put(&cursor, oblock);
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EVP_CIPHER_CTX_free(ctx);
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zap(iblock, BLOCK_SIZE);
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zap(oblock, BLOCK_SIZE);
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return (ret == 1) ? 0 : KRB5_CRYPTO_INTERNAL;
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}
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static krb5_error_code
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cts_encr(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
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size_t num_data, size_t dlen)
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{
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int ret = 0;
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size_t size = 0;
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unsigned char *oblock = NULL, *dbuf = NULL;
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unsigned char iv_cts[IV_CTS_BUF_SIZE];
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struct iov_cursor cursor;
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AES_KEY enck;
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memset(iv_cts,0,sizeof(iv_cts));
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if (ivec && ivec->data){
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if (ivec->length != sizeof(iv_cts))
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return KRB5_CRYPTO_INTERNAL;
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memcpy(iv_cts, ivec->data,ivec->length);
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}
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oblock = OPENSSL_malloc(dlen);
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if (!oblock){
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return ENOMEM;
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}
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dbuf = OPENSSL_malloc(dlen);
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if (!dbuf){
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OPENSSL_free(oblock);
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return ENOMEM;
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}
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k5_iov_cursor_init(&cursor, data, num_data, dlen, FALSE);
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k5_iov_cursor_get(&cursor, dbuf);
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AES_set_encrypt_key(key->keyblock.contents,
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NUM_BITS * key->keyblock.length, &enck);
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size = CRYPTO_cts128_encrypt((unsigned char *)dbuf, oblock, dlen, &enck,
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iv_cts, AES_cbc_encrypt);
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if (size <= 0)
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ret = KRB5_CRYPTO_INTERNAL;
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else
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k5_iov_cursor_put(&cursor, oblock);
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if (!ret && ivec && ivec->data)
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memcpy(ivec->data, iv_cts, sizeof(iv_cts));
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zap(oblock, dlen);
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zap(dbuf, dlen);
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OPENSSL_free(oblock);
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OPENSSL_free(dbuf);
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return ret;
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}
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static krb5_error_code
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cts_decr(krb5_key key, const krb5_data *ivec, krb5_crypto_iov *data,
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size_t num_data, size_t dlen)
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{
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int ret = 0;
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size_t size = 0;
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unsigned char *oblock = NULL;
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unsigned char *dbuf = NULL;
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unsigned char iv_cts[IV_CTS_BUF_SIZE];
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struct iov_cursor cursor;
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AES_KEY deck;
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memset(iv_cts,0,sizeof(iv_cts));
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if (ivec && ivec->data){
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if (ivec->length != sizeof(iv_cts))
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return KRB5_CRYPTO_INTERNAL;
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memcpy(iv_cts, ivec->data,ivec->length);
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}
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oblock = OPENSSL_malloc(dlen);
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if (!oblock)
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return ENOMEM;
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dbuf = OPENSSL_malloc(dlen);
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if (!dbuf){
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OPENSSL_free(oblock);
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return ENOMEM;
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}
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AES_set_decrypt_key(key->keyblock.contents,
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NUM_BITS * key->keyblock.length, &deck);
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k5_iov_cursor_init(&cursor, data, num_data, dlen, FALSE);
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k5_iov_cursor_get(&cursor, dbuf);
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size = CRYPTO_cts128_decrypt((unsigned char *)dbuf, oblock,
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dlen, &deck,
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iv_cts, AES_cbc_encrypt);
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if (size <= 0)
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ret = KRB5_CRYPTO_INTERNAL;
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else
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k5_iov_cursor_put(&cursor, oblock);
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if (!ret && ivec && ivec->data)
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memcpy(ivec->data, iv_cts, sizeof(iv_cts));
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zap(oblock, dlen);
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zap(dbuf, dlen);
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OPENSSL_free(oblock);
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OPENSSL_free(dbuf);
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return ret;
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}
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krb5_error_code
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krb5int_aes_encrypt(krb5_key key, const krb5_data *ivec,
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krb5_crypto_iov *data, size_t num_data)
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{
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int ret = 0;
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size_t input_length, nblocks;
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input_length = iov_total_length(data, num_data, FALSE);
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nblocks = (input_length + BLOCK_SIZE - 1) / BLOCK_SIZE;
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if (nblocks == 1) {
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if (input_length != BLOCK_SIZE)
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return KRB5_BAD_MSIZE;
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ret = cbc_enc(key, ivec, data, num_data);
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} else if (nblocks > 1) {
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ret = cts_encr(key, ivec, data, num_data, input_length);
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}
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return ret;
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}
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krb5_error_code
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krb5int_aes_decrypt(krb5_key key, const krb5_data *ivec,
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krb5_crypto_iov *data, size_t num_data)
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{
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int ret = 0;
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size_t input_length, nblocks;
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input_length = iov_total_length(data, num_data, FALSE);
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nblocks = (input_length + BLOCK_SIZE - 1) / BLOCK_SIZE;
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if (nblocks == 1) {
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if (input_length != BLOCK_SIZE)
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return KRB5_BAD_MSIZE;
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ret = cbc_decr(key, ivec, data, num_data);
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} else if (nblocks > 1) {
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ret = cts_decr(key, ivec, data, num_data, input_length);
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}
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return ret;
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}
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static krb5_error_code
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krb5int_aes_init_state (const krb5_keyblock *key, krb5_keyusage usage,
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krb5_data *state)
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{
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state->length = 16;
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state->data = (void *) malloc(16);
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if (state->data == NULL)
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return ENOMEM;
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memset(state->data, 0, state->length);
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return 0;
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}
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const struct krb5_enc_provider krb5int_enc_aes128 = {
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16,
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16, 16,
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krb5int_aes_encrypt,
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krb5int_aes_decrypt,
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NULL,
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krb5int_aes_init_state,
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krb5int_default_free_state
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};
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const struct krb5_enc_provider krb5int_enc_aes256 = {
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16,
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32, 32,
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krb5int_aes_encrypt,
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krb5int_aes_decrypt,
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NULL,
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krb5int_aes_init_state,
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krb5int_default_free_state
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};
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