284 lines
7.1 KiB
C
284 lines
7.1 KiB
C
/* $OpenBSD: rsa_pk1.c,v 1.17 2024/03/30 04:34:17 jsing Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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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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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/rsa.h>
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#include "bytestring.h"
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int
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RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen,
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const unsigned char *from, int flen)
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{
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CBB cbb;
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int i;
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int ret = 0;
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/*
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* Pad data block with PKCS1 type 1 padding - RFC 2313, section 8.1.
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*/
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memset(&cbb, 0, sizeof(cbb));
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if (flen < 0 || tlen < 0)
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goto err;
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if (flen > tlen - RSA_PKCS1_PADDING_SIZE) {
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RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
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goto err;
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}
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if (!CBB_init_fixed(&cbb, to, tlen))
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goto err;
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/*
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* Add leading NUL, block type (0x01), padding bytes (0xff) and
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* trailing NUL.
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*/
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if (!CBB_add_u8(&cbb, 0))
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goto err;
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if (!CBB_add_u8(&cbb, 1))
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goto err;
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for (i = 0; i < tlen - 3 - flen; i++) {
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if (!CBB_add_u8(&cbb, 0xff))
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goto err;
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}
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if (!CBB_add_u8(&cbb, 0))
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goto err;
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/* Now add the actual data. */
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if (!CBB_add_bytes(&cbb, from, flen))
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goto err;
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if (!CBB_finish(&cbb, NULL, NULL))
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goto err;
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ret = 1;
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err:
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CBB_cleanup(&cbb);
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return ret;
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}
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LCRYPTO_ALIAS(RSA_padding_add_PKCS1_type_1);
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int
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RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen,
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const unsigned char *from, int flen, int num)
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{
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int i, j;
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const unsigned char *p;
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p = from;
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if (num != flen + 1 || *(p++) != 01) {
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RSAerror(RSA_R_BLOCK_TYPE_IS_NOT_01);
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return -1;
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}
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/* scan over padding data */
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j = flen - 1; /* one for type. */
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for (i = 0; i < j; i++) {
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if (*p != 0xff) {
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/* should decrypt to 0xff */
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if (*p == 0) {
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p++;
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break;
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} else {
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RSAerror(RSA_R_BAD_FIXED_HEADER_DECRYPT);
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return -1;
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}
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}
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p++;
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}
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if (i == j) {
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RSAerror(RSA_R_NULL_BEFORE_BLOCK_MISSING);
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return -1;
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}
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if (i < 8) {
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RSAerror(RSA_R_BAD_PAD_BYTE_COUNT);
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return -1;
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}
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i++; /* Skip over the '\0' */
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j -= i;
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if (j > tlen) {
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RSAerror(RSA_R_DATA_TOO_LARGE);
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return -1;
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}
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memcpy(to, p, j);
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return j;
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}
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LCRYPTO_ALIAS(RSA_padding_check_PKCS1_type_1);
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int
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RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen,
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const unsigned char *from, int flen)
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{
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uint8_t padding[256];
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uint8_t pad;
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CBB cbb;
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CBS cbs;
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int i;
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int ret = 0;
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/*
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* Pad data block with PKCS1 type 2 padding - RFC 2313, section 8.1.
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*/
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memset(&cbb, 0, sizeof(cbb));
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CBS_init(&cbs, NULL, 0);
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if (flen < 0 || tlen < 0)
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goto err;
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if (flen > tlen - RSA_PKCS1_PADDING_SIZE) {
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RSAerror(RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
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goto err;
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}
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if (!CBB_init_fixed(&cbb, to, tlen))
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goto err;
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/*
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* Add leading NUL, block type (0x02), padding bytes (random non-zero
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* bytes) and trailing NUL.
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*/
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if (!CBB_add_u8(&cbb, 0))
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goto err;
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if (!CBB_add_u8(&cbb, 2))
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goto err;
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for (i = 0; i < tlen - 3 - flen; i++) {
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do {
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if (CBS_len(&cbs) == 0) {
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arc4random_buf(padding, sizeof(padding));
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CBS_init(&cbs, padding, sizeof(padding));
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}
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if (!CBS_get_u8(&cbs, &pad))
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goto err;
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} while (pad == 0);
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if (!CBB_add_u8(&cbb, pad))
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goto err;
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}
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if (!CBB_add_u8(&cbb, 0))
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goto err;
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/* Now add the actual data. */
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if (!CBB_add_bytes(&cbb, from, flen))
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goto err;
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if (!CBB_finish(&cbb, NULL, NULL))
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goto err;
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ret = 1;
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err:
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CBB_cleanup(&cbb);
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explicit_bzero(padding, sizeof(padding));
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return ret;
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}
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LCRYPTO_ALIAS(RSA_padding_add_PKCS1_type_2);
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int
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RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen,
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const unsigned char *from, int flen, int num)
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{
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int i, j;
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const unsigned char *p;
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p = from;
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if (num != flen + 1 || *(p++) != 02) {
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RSAerror(RSA_R_BLOCK_TYPE_IS_NOT_02);
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return -1;
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}
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/* scan over padding data */
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j = flen - 1; /* one for type. */
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for (i = 0; i < j; i++)
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if (*(p++) == 0)
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break;
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if (i == j) {
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RSAerror(RSA_R_NULL_BEFORE_BLOCK_MISSING);
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return -1;
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}
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if (i < 8) {
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RSAerror(RSA_R_BAD_PAD_BYTE_COUNT);
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return -1;
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}
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i++; /* Skip over the '\0' */
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j -= i;
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if (j > tlen) {
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RSAerror(RSA_R_DATA_TOO_LARGE);
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return -1;
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}
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memcpy(to, p, j);
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return j;
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}
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LCRYPTO_ALIAS(RSA_padding_check_PKCS1_type_2);
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