| 1 | /*
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| 2 | * Copyright 2005-2020 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /*
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| 11 | * RSA low level APIs are deprecated for public use, but still ok for
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| 12 | * internal use.
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| 13 | */
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| 14 | #include "internal/deprecated.h"
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| 15 |
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| 16 | #include <stdio.h>
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| 17 | #include "internal/cryptlib.h"
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| 18 | #include <openssl/bn.h>
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| 19 | #include <openssl/rsa.h>
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| 20 | #include <openssl/objects.h>
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| 21 |
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| 22 | int RSA_padding_add_X931(unsigned char *to, int tlen,
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| 23 | const unsigned char *from, int flen)
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| 24 | {
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| 25 | int j;
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| 26 | unsigned char *p;
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| 27 |
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| 28 | /*
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| 29 | * Absolute minimum amount of padding is 1 header nibble, 1 padding
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| 30 | * nibble and 2 trailer bytes: but 1 hash if is already in 'from'.
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| 31 | */
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| 32 |
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| 33 | j = tlen - flen - 2;
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| 34 |
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| 35 | if (j < 0) {
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| 36 | ERR_raise(ERR_LIB_RSA, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
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| 37 | return -1;
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| 38 | }
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| 39 |
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| 40 | p = (unsigned char *)to;
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| 41 |
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| 42 | /* If no padding start and end nibbles are in one byte */
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| 43 | if (j == 0) {
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| 44 | *p++ = 0x6A;
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| 45 | } else {
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| 46 | *p++ = 0x6B;
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| 47 | if (j > 1) {
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| 48 | memset(p, 0xBB, j - 1);
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| 49 | p += j - 1;
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| 50 | }
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| 51 | *p++ = 0xBA;
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| 52 | }
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| 53 | memcpy(p, from, (unsigned int)flen);
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| 54 | p += flen;
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| 55 | *p = 0xCC;
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| 56 | return 1;
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| 57 | }
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| 58 |
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| 59 | int RSA_padding_check_X931(unsigned char *to, int tlen,
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| 60 | const unsigned char *from, int flen, int num)
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| 61 | {
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| 62 | int i = 0, j;
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| 63 | const unsigned char *p;
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| 64 |
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| 65 | p = from;
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| 66 | if ((num != flen) || ((*p != 0x6A) && (*p != 0x6B))) {
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| 67 | ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_HEADER);
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| 68 | return -1;
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| 69 | }
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| 70 |
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| 71 | if (*p++ == 0x6B) {
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| 72 | j = flen - 3;
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| 73 | for (i = 0; i < j; i++) {
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| 74 | unsigned char c = *p++;
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| 75 | if (c == 0xBA)
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| 76 | break;
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| 77 | if (c != 0xBB) {
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| 78 | ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING);
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| 79 | return -1;
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| 80 | }
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| 81 | }
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| 82 |
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| 83 | j -= i;
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| 84 |
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| 85 | if (i == 0) {
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| 86 | ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING);
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| 87 | return -1;
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| 88 | }
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| 89 |
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| 90 | } else {
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| 91 | j = flen - 2;
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| 92 | }
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| 93 |
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| 94 | if (p[j] != 0xCC) {
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| 95 | ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_TRAILER);
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| 96 | return -1;
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| 97 | }
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| 98 |
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| 99 | memcpy(to, p, (unsigned int)j);
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| 100 |
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| 101 | return j;
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| 102 | }
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| 103 |
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| 104 | /* Translate between X931 hash ids and NIDs */
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| 105 |
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| 106 | int RSA_X931_hash_id(int nid)
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| 107 | {
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| 108 | switch (nid) {
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| 109 | case NID_sha1:
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| 110 | return 0x33;
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| 111 |
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| 112 | case NID_sha256:
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| 113 | return 0x34;
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| 114 |
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| 115 | case NID_sha384:
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| 116 | return 0x36;
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| 117 |
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| 118 | case NID_sha512:
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| 119 | return 0x35;
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| 120 |
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| 121 | }
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| 122 | return -1;
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| 123 | }
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