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https://github.com/openssl/openssl.git
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149 lines
3.7 KiB
C
149 lines
3.7 KiB
C
/*
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* Copyright 2005-2024 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (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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/*
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* RSA low level APIs are deprecated for public use, but still ok for
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* internal use.
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*/
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#include "internal/deprecated.h"
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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/objects.h>
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/*
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* X9.31 Embeds the hash inside the following data structure
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*
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* header (4 bits = 0x6)
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* padding (consisting of zero or more 4 bit values of a sequence of 0xB,
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* ending with the terminator 0xA)
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* hash(Msg) hash of a message (the output size is related to the hash function)
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* trailer (consists of 2 bytes)
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* The 1st byte is related to a part number for a hash algorithm
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* (See RSA_X931_hash_id()), followed by the fixed value 0xCC
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*
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* The RSA modulus size n (which for X9.31 is 1024 + 256*s) is the size of the data
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* structure, which determines the padding size.
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* i.e. len(padding) = n - len(header) - len(hash) - len(trailer)
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*
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* Params:
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* to The output buffer to write the data structure to.
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* tolen The size of 'to' in bytes (it is the size of the n)
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* from The input hash followed by the 1st byte of the trailer.
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* flen The size of the input hash + 1 (trailer byte)
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*/
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int RSA_padding_add_X931(unsigned char *to, int tlen,
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const unsigned char *from, int flen)
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{
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int j;
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unsigned char *p;
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/*
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* We need at least 1 byte for header + padding (0x6A)
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* And 2 trailer bytes (but we subtract 1 since flen includes 1 trailer byte)
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*/
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j = tlen - flen - 2;
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if (j < 0) {
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ERR_raise(ERR_LIB_RSA, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
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return -1;
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}
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p = (unsigned char *)to;
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/* If no padding start and end nibbles are in one byte */
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if (j == 0) {
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*p++ = 0x6A;
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} else {
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*p++ = 0x6B;
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if (j > 1) {
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memset(p, 0xBB, j - 1);
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p += j - 1;
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}
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*p++ = 0xBA;
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}
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memcpy(p, from, (unsigned int)flen);
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p += flen;
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*p = 0xCC;
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return 1;
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}
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int RSA_padding_check_X931(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 = 0, j;
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const unsigned char *p;
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p = from;
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if ((num != flen) || ((*p != 0x6A) && (*p != 0x6B))) {
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ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_HEADER);
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return -1;
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}
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if (*p++ == 0x6B) {
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j = flen - 3;
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for (i = 0; i < j; i++) {
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unsigned char c = *p++;
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if (c == 0xBA)
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break;
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if (c != 0xBB) {
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ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING);
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return -1;
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}
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}
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j -= i;
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if (i == 0) {
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ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_PADDING);
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return -1;
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}
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} else {
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j = flen - 2;
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}
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if (p[j] != 0xCC) {
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ERR_raise(ERR_LIB_RSA, RSA_R_INVALID_TRAILER);
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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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/*
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* Translate between X9.31 hash ids and NIDs
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* The returned values relate to ISO/IEC 10118 part numbers which consist of
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* a hash algorithm and hash number. The returned values are used as the
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* first byte of the 'trailer'.
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*/
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int RSA_X931_hash_id(int nid)
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{
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switch (nid) {
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case NID_sha1:
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return 0x33;
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case NID_sha256:
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return 0x34;
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case NID_sha384:
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return 0x36;
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case NID_sha512:
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return 0x35;
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}
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return -1;
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}
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