mirror of https://github.com/openssl/openssl.git
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/*
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* Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#include <openssl/rand.h>
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int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
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const unsigned char *from, int flen)
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{
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int i, j;
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unsigned char *p;
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if (flen > (tlen - 11)) {
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RSAerr(RSA_F_RSA_PADDING_ADD_SSLV23,
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RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
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return 0;
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}
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p = (unsigned char *)to;
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*(p++) = 0;
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*(p++) = 2; /* Public Key BT (Block Type) */
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/* pad out with non-zero random data */
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j = tlen - 3 - 8 - flen;
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if (RAND_bytes(p, j) <= 0)
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return 0;
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for (i = 0; i < j; i++) {
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if (*p == '\0')
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do {
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if (RAND_bytes(p, 1) <= 0)
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return 0;
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} while (*p == '\0');
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p++;
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}
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memset(p, 3, 8);
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p += 8;
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*(p++) = '\0';
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memcpy(p, from, (unsigned int)flen);
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return 1;
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}
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int RSA_padding_check_SSLv23(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, k;
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const unsigned char *p;
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p = from;
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if (flen < 10) {
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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_SMALL);
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return -1;
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}
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if ((num != (flen + 1)) || (*(p++) != 02)) {
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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, 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) || (i < 8)) {
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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,
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RSA_R_NULL_BEFORE_BLOCK_MISSING);
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return -1;
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}
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for (k = -9; k < -1; k++) {
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if (p[k] != 0x03)
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break;
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}
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if (k == -1) {
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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_SSLV3_ROLLBACK_ATTACK);
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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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RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_LARGE);
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return -1;
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}
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memcpy(to, p, (unsigned int)j);
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return j;
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}
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