211 lines
6.1 KiB
C
211 lines
6.1 KiB
C
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/* $OpenBSD: evp_key.c,v 1.26 2018/08/14 17:59:26 tb Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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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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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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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 the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <string.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/objects.h>
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#include <openssl/ui.h>
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#include <openssl/x509.h>
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/* should be init to zeros. */
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static char prompt_string[80];
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void
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EVP_set_pw_prompt(const char *prompt)
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{
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if (prompt == NULL)
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prompt_string[0] = '\0';
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else {
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strlcpy(prompt_string, prompt, sizeof(prompt_string));
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}
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}
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char *
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EVP_get_pw_prompt(void)
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{
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if (prompt_string[0] == '\0')
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return (NULL);
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else
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return (prompt_string);
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}
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int
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EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
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{
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return EVP_read_pw_string_min(buf, 0, len, prompt, verify);
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}
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int
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EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt,
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int verify)
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{
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int ret;
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char buff[BUFSIZ];
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UI *ui;
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if (len > BUFSIZ)
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len = BUFSIZ;
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/* Ensure that 0 <= min <= len - 1. In particular, 1 <= len. */
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if (min < 0 || len - 1 < min)
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return -1;
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if ((prompt == NULL) && (prompt_string[0] != '\0'))
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prompt = prompt_string;
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ui = UI_new();
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if (ui == NULL)
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return -1;
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if (UI_add_input_string(ui, prompt, 0, buf, min, len - 1) < 0)
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return -1;
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if (verify) {
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if (UI_add_verify_string(ui, prompt, 0, buff, min, len - 1, buf)
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< 0)
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return -1;
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}
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ret = UI_process(ui);
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UI_free(ui);
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explicit_bzero(buff, BUFSIZ);
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return ret;
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}
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int
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EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
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const unsigned char *salt, const unsigned char *data, int datal,
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int count, unsigned char *key, unsigned char *iv)
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{
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EVP_MD_CTX c;
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unsigned char md_buf[EVP_MAX_MD_SIZE];
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int niv, nkey, addmd = 0;
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unsigned int mds = 0, i;
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int rv = 0;
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nkey = type->key_len;
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niv = type->iv_len;
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if ((size_t)nkey > EVP_MAX_KEY_LENGTH) {
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EVPerror(EVP_R_BAD_KEY_LENGTH);
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return 0;
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}
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if ((size_t)niv > EVP_MAX_IV_LENGTH) {
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EVPerror(EVP_R_IV_TOO_LARGE);
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return 0;
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}
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if (data == NULL)
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return (nkey);
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EVP_MD_CTX_init(&c);
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for (;;) {
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if (!EVP_DigestInit_ex(&c, md, NULL))
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goto err;
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if (addmd++)
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if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
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goto err;
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if (!EVP_DigestUpdate(&c, data, datal))
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goto err;
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if (salt != NULL)
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if (!EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN))
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goto err;
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if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
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goto err;
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for (i = 1; i < (unsigned int)count; i++) {
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if (!EVP_DigestInit_ex(&c, md, NULL))
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goto err;
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if (!EVP_DigestUpdate(&c, &(md_buf[0]), mds))
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goto err;
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if (!EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds))
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goto err;
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}
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i = 0;
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if (nkey) {
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for (;;) {
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if (nkey == 0)
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break;
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if (i == mds)
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break;
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if (key != NULL)
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*(key++) = md_buf[i];
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nkey--;
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i++;
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}
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}
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if (niv && (i != mds)) {
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for (;;) {
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if (niv == 0)
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break;
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if (i == mds)
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break;
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if (iv != NULL)
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*(iv++) = md_buf[i];
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niv--;
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i++;
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}
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}
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if ((nkey == 0) && (niv == 0))
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break;
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}
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rv = type->key_len;
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err:
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EVP_MD_CTX_cleanup(&c);
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explicit_bzero(md_buf, sizeof md_buf);
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return rv;
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}
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