238 lines
7.6 KiB
C
238 lines
7.6 KiB
C
/* p12_key.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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* 1999.
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*/
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/* ====================================================================
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* Copyright (c) 1999 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/pkcs12.h>
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#include <openssl/bn.h>
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/* Uncomment out this line to get debugging info about key generation */
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/*
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* #define DEBUG_KEYGEN
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*/
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#ifdef DEBUG_KEYGEN
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# include <openssl/bio.h>
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extern BIO *bio_err;
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void h__dump(unsigned char *p, int len);
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#endif
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/* PKCS12 compatible key/IV generation */
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#ifndef min
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# define min(a,b) ((a) < (b) ? (a) : (b))
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#endif
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int PKCS12_key_gen_asc(const char *pass, int passlen, unsigned char *salt,
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int saltlen, int id, int iter, int n,
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unsigned char *out, const EVP_MD *md_type)
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{
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int ret;
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unsigned char *unipass;
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int uniplen;
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if (!pass) {
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unipass = NULL;
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uniplen = 0;
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} else if (!OPENSSL_asc2uni(pass, passlen, &unipass, &uniplen)) {
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PKCS12err(PKCS12_F_PKCS12_KEY_GEN_ASC, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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ret = PKCS12_key_gen_uni(unipass, uniplen, salt, saltlen,
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id, iter, n, out, md_type);
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if (ret <= 0)
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return 0;
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if (unipass) {
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OPENSSL_cleanse(unipass, uniplen); /* Clear password from memory */
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OPENSSL_free(unipass);
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}
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return ret;
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}
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int PKCS12_key_gen_uni(unsigned char *pass, int passlen, unsigned char *salt,
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int saltlen, int id, int iter, int n,
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unsigned char *out, const EVP_MD *md_type)
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{
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unsigned char *B, *D, *I, *p, *Ai;
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int Slen, Plen, Ilen, Ijlen;
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int i, j, u, v;
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int ret = 0;
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BIGNUM *Ij, *Bpl1; /* These hold Ij and B + 1 */
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EVP_MD_CTX ctx;
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#ifdef DEBUG_KEYGEN
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unsigned char *tmpout = out;
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int tmpn = n;
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#endif
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#if 0
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if (!pass) {
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PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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#endif
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EVP_MD_CTX_init(&ctx);
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#ifdef DEBUG_KEYGEN
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fprintf(stderr, "KEYGEN DEBUG\n");
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fprintf(stderr, "ID %d, ITER %d\n", id, iter);
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fprintf(stderr, "Password (length %d):\n", passlen);
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h__dump(pass, passlen);
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fprintf(stderr, "Salt (length %d):\n", saltlen);
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h__dump(salt, saltlen);
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#endif
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v = EVP_MD_block_size(md_type);
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u = EVP_MD_size(md_type);
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if (u < 0)
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return 0;
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D = OPENSSL_malloc(v);
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Ai = OPENSSL_malloc(u);
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B = OPENSSL_malloc(v + 1);
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Slen = v * ((saltlen + v - 1) / v);
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if (passlen)
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Plen = v * ((passlen + v - 1) / v);
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else
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Plen = 0;
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Ilen = Slen + Plen;
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I = OPENSSL_malloc(Ilen);
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Ij = BN_new();
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Bpl1 = BN_new();
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if (!D || !Ai || !B || !I || !Ij || !Bpl1)
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goto err;
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for (i = 0; i < v; i++)
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D[i] = id;
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p = I;
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for (i = 0; i < Slen; i++)
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*p++ = salt[i % saltlen];
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for (i = 0; i < Plen; i++)
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*p++ = pass[i % passlen];
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for (;;) {
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if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
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|| !EVP_DigestUpdate(&ctx, D, v)
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|| !EVP_DigestUpdate(&ctx, I, Ilen)
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|| !EVP_DigestFinal_ex(&ctx, Ai, NULL))
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goto err;
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for (j = 1; j < iter; j++) {
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if (!EVP_DigestInit_ex(&ctx, md_type, NULL)
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|| !EVP_DigestUpdate(&ctx, Ai, u)
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|| !EVP_DigestFinal_ex(&ctx, Ai, NULL))
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goto err;
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}
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memcpy(out, Ai, min(n, u));
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if (u >= n) {
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#ifdef DEBUG_KEYGEN
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fprintf(stderr, "Output KEY (length %d)\n", tmpn);
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h__dump(tmpout, tmpn);
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#endif
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ret = 1;
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goto end;
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}
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n -= u;
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out += u;
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for (j = 0; j < v; j++)
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B[j] = Ai[j % u];
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/* Work out B + 1 first then can use B as tmp space */
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if (!BN_bin2bn(B, v, Bpl1))
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goto err;
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if (!BN_add_word(Bpl1, 1))
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goto err;
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for (j = 0; j < Ilen; j += v) {
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if (!BN_bin2bn(I + j, v, Ij))
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goto err;
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if (!BN_add(Ij, Ij, Bpl1))
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goto err;
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if (!BN_bn2bin(Ij, B))
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goto err;
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Ijlen = BN_num_bytes(Ij);
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/* If more than 2^(v*8) - 1 cut off MSB */
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if (Ijlen > v) {
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if (!BN_bn2bin(Ij, B))
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goto err;
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memcpy(I + j, B + 1, v);
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#ifndef PKCS12_BROKEN_KEYGEN
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/* If less than v bytes pad with zeroes */
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} else if (Ijlen < v) {
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memset(I + j, 0, v - Ijlen);
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if (!BN_bn2bin(Ij, I + j + v - Ijlen))
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goto err;
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#endif
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} else if (!BN_bn2bin(Ij, I + j))
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goto err;
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}
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}
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err:
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PKCS12err(PKCS12_F_PKCS12_KEY_GEN_UNI, ERR_R_MALLOC_FAILURE);
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end:
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OPENSSL_free(Ai);
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OPENSSL_free(B);
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OPENSSL_free(D);
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OPENSSL_free(I);
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BN_free(Ij);
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BN_free(Bpl1);
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EVP_MD_CTX_cleanup(&ctx);
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return ret;
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}
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#ifdef DEBUG_KEYGEN
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void h__dump(unsigned char *p, int len)
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{
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for (; len--; p++)
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fprintf(stderr, "%02X", *p);
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fprintf(stderr, "\n");
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}
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#endif
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