1212818eb0
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7176)
108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/*
|
|
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the OpenSSL license (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include "internal/cryptlib.h"
|
|
#include <openssl/bn.h>
|
|
#include <openssl/rsa.h>
|
|
#include <openssl/rand.h>
|
|
|
|
int RSA_padding_add_SSLv23(unsigned char *to, int tlen,
|
|
const unsigned char *from, int flen)
|
|
{
|
|
int i, j;
|
|
unsigned char *p;
|
|
|
|
if (flen > (tlen - 11)) {
|
|
RSAerr(RSA_F_RSA_PADDING_ADD_SSLV23,
|
|
RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
p = (unsigned char *)to;
|
|
|
|
*(p++) = 0;
|
|
*(p++) = 2; /* Public Key BT (Block Type) */
|
|
|
|
/* pad out with non-zero random data */
|
|
j = tlen - 3 - 8 - flen;
|
|
|
|
if (RAND_bytes(p, j) <= 0)
|
|
return 0;
|
|
for (i = 0; i < j; i++) {
|
|
if (*p == '\0')
|
|
do {
|
|
if (RAND_bytes(p, 1) <= 0)
|
|
return 0;
|
|
} while (*p == '\0');
|
|
p++;
|
|
}
|
|
|
|
memset(p, 3, 8);
|
|
p += 8;
|
|
*(p++) = '\0';
|
|
|
|
memcpy(p, from, (unsigned int)flen);
|
|
return 1;
|
|
}
|
|
|
|
int RSA_padding_check_SSLv23(unsigned char *to, int tlen,
|
|
const unsigned char *from, int flen, int num)
|
|
{
|
|
int i, j, k;
|
|
const unsigned char *p;
|
|
|
|
p = from;
|
|
if (flen < 10) {
|
|
RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_SMALL);
|
|
return -1;
|
|
}
|
|
/* Accept even zero-padded input */
|
|
if (flen == num) {
|
|
if (*(p++) != 0) {
|
|
RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_BLOCK_TYPE_IS_NOT_02);
|
|
return -1;
|
|
}
|
|
flen--;
|
|
}
|
|
if ((num != (flen + 1)) || (*(p++) != 02)) {
|
|
RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_BLOCK_TYPE_IS_NOT_02);
|
|
return -1;
|
|
}
|
|
|
|
/* scan over padding data */
|
|
j = flen - 1; /* one for type */
|
|
for (i = 0; i < j; i++)
|
|
if (*(p++) == 0)
|
|
break;
|
|
|
|
if ((i == j) || (i < 8)) {
|
|
RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,
|
|
RSA_R_NULL_BEFORE_BLOCK_MISSING);
|
|
return -1;
|
|
}
|
|
for (k = -9; k < -1; k++) {
|
|
if (p[k] != 0x03)
|
|
break;
|
|
}
|
|
if (k == -1) {
|
|
RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_SSLV3_ROLLBACK_ATTACK);
|
|
return -1;
|
|
}
|
|
|
|
i++; /* Skip over the '\0' */
|
|
j -= i;
|
|
if (j > tlen) {
|
|
RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23, RSA_R_DATA_TOO_LARGE);
|
|
return -1;
|
|
}
|
|
memcpy(to, p, (unsigned int)j);
|
|
|
|
return j;
|
|
}
|