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167 lines
4.9 KiB
167 lines
4.9 KiB
/* rsa_x931.c */ |
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/* |
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project |
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* 2005. |
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*/ |
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/* ==================================================================== |
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* Copyright (c) 2005 The OpenSSL Project. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. All advertising materials mentioning features or use of this |
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* software must display the following acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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* |
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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* endorse or promote products derived from this software without |
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* prior written permission. For written permission, please contact |
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* licensing@OpenSSL.org. |
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* |
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* 5. Products derived from this software may not be called "OpenSSL" |
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* nor may "OpenSSL" appear in their names without prior written |
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* permission of the OpenSSL Project. |
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* |
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* 6. Redistributions of any form whatsoever must retain the following |
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* acknowledgment: |
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* "This product includes software developed by the OpenSSL Project |
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This product includes cryptographic software written by Eric Young |
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* (eay@cryptsoft.com). This product includes software written by Tim |
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* Hudson (tjh@cryptsoft.com). |
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* |
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*/ |
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#include <stdio.h> |
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#include "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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#include <openssl/objects.h> |
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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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* Absolute minimum amount of padding is 1 header nibble, 1 padding |
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* nibble and 2 trailer bytes: but 1 hash if is already in 'from'. |
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*/ |
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j = tlen - flen - 2; |
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if (j < 0) { |
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RSAerr(RSA_F_RSA_PADDING_ADD_X931, 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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RSAerr(RSA_F_RSA_PADDING_CHECK_X931, 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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RSAerr(RSA_F_RSA_PADDING_CHECK_X931, 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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RSAerr(RSA_F_RSA_PADDING_CHECK_X931, 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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if (p[j] != 0xCC) { |
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RSAerr(RSA_F_RSA_PADDING_CHECK_X931, 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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/* Translate between X931 hash ids and NIDs */ |
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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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