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- /*
- * Copyright 2005-2020 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (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
- */
- /*
- * RSA low level APIs are deprecated for public use, but still ok for
- * internal use.
- */
- #include "internal/deprecated.h"
- #include <stdio.h>
- #include "internal/cryptlib.h"
- #include <openssl/bn.h>
- #include <openssl/rsa.h>
- #include <openssl/objects.h>
- int RSA_padding_add_X931(unsigned char *to, int tlen,
- const unsigned char *from, int flen)
- {
- int j;
- unsigned char *p;
- /*
- * Absolute minimum amount of padding is 1 header nibble, 1 padding
- * nibble and 2 trailer bytes: but 1 hash if is already in 'from'.
- */
- j = tlen - flen - 2;
- if (j < 0) {
- ERR_raise(ERR_LIB_RSA, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
- return -1;
- }
- p = (unsigned char *)to;
- /* If no padding start and end nibbles are in one byte */
- if (j == 0) {
- *p++ = 0x6A;
- } else {
- *p++ = 0x6B;
- if (j > 1) {
- memset(p, 0xBB, j - 1);
- p += j - 1;
- }
- *p++ = 0xBA;
- }
- memcpy(p, from, (unsigned int)flen);
- p += flen;
- *p = 0xCC;
- return 1;
- }
- int RSA_padding_check_X931(unsigned char *to, int tlen,
- const unsigned char *from, int flen, int num)
- {
- int i = 0, j;
- const unsigned char *p;
- p = from;
- if ((num != flen) || ((*p != 0x6A) && (*p != 0x6B))) {
- ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_HEADER);
- return -1;
- }
- if (*p++ == 0x6B) {
- j = flen - 3;
- for (i = 0; i < j; i++) {
- unsigned char c = *p++;
- if (c == 0xBA)
- break;
- if (c != 0xBB) {
- ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING);
- return -1;
- }
- }
- j -= i;
- if (i == 0) {
- ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING);
- return -1;
- }
- } else {
- j = flen - 2;
- }
- if (p[j] != 0xCC) {
- ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_TRAILER);
- return -1;
- }
- memcpy(to, p, (unsigned int)j);
- return j;
- }
- /* Translate between X931 hash ids and NIDs */
- int RSA_X931_hash_id(int nid)
- {
- switch (nid) {
- case NID_sha1:
- return 0x33;
- case NID_sha256:
- return 0x34;
- case NID_sha384:
- return 0x36;
- case NID_sha512:
- return 0x35;
- }
- return -1;
- }
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