/* $OpenBSD: evp_key.c,v 1.37 2025/05/10 05:54:38 tb Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include <stdio.h> #include <string.h> #include <openssl/evp.h> #include <openssl/objects.h> #include <openssl/ui.h> #include <openssl/x509.h> #include "err_local.h" #include "evp_local.h" /* should be init to zeros. */ static char prompt_string[80]; void EVP_set_pw_prompt(const char *prompt) { if (prompt == NULL) prompt_string[0] = '\0'; else strlcpy(prompt_string, prompt, sizeof(prompt_string)); } LCRYPTO_ALIAS(EVP_set_pw_prompt); char * EVP_get_pw_prompt(void) { if (prompt_string[0] == '\0') return NULL; return prompt_string; } LCRYPTO_ALIAS(EVP_get_pw_prompt); int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify) { return EVP_read_pw_string_min(buf, 0, len, prompt, verify); } LCRYPTO_ALIAS(EVP_read_pw_string); int EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt, int verify) { UI *ui = NULL; char buff[BUFSIZ]; int ret = -1; if (len > BUFSIZ) len = BUFSIZ; /* Ensure that 0 <= min <= len - 1. In particular, 1 <= len. */ if (min < 0 || len - 1 < min) goto err; if (prompt == NULL && prompt_string[0] != '\0') prompt = prompt_string; if ((ui = UI_new()) == NULL) goto err; if (UI_add_input_string(ui, prompt, 0, buf, min, len - 1) < 0) goto err; if (verify) { if (UI_add_verify_string(ui, prompt, 0, buff, min, len - 1, buf) < 0) goto err; } ret = UI_process(ui); err: UI_free(ui); explicit_bzero(buff, BUFSIZ); return ret; } LCRYPTO_ALIAS(EVP_read_pw_string_min); int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md, const unsigned char *salt, const unsigned char *data, int datal, int count, unsigned char *key, unsigned char *iv) { EVP_MD_CTX *md_ctx; unsigned char md_buf[EVP_MAX_MD_SIZE]; int niv, nkey, addmd = 0; unsigned int mds = 0, i; int rv = 0; nkey = type->key_len; niv = type->iv_len; if ((size_t)nkey > EVP_MAX_KEY_LENGTH) { EVPerror(EVP_R_BAD_KEY_LENGTH); return 0; } if ((size_t)niv > EVP_MAX_IV_LENGTH) { EVPerror(EVP_R_IV_TOO_LARGE); return 0; } if (data == NULL) return nkey; if ((md_ctx = EVP_MD_CTX_new()) == NULL) goto err; for (;;) { if (!EVP_DigestInit_ex(md_ctx, md, NULL)) goto err; if (addmd++) if (!EVP_DigestUpdate(md_ctx, &(md_buf[0]), mds)) goto err; if (!EVP_DigestUpdate(md_ctx, data, datal)) goto err; if (salt != NULL) if (!EVP_DigestUpdate(md_ctx, salt, PKCS5_SALT_LEN)) goto err; if (!EVP_DigestFinal_ex(md_ctx, &(md_buf[0]), &mds)) goto err; for (i = 1; i < (unsigned int)count; i++) { if (!EVP_DigestInit_ex(md_ctx, md, NULL)) goto err; if (!EVP_DigestUpdate(md_ctx, &(md_buf[0]), mds)) goto err; if (!EVP_DigestFinal_ex(md_ctx, &(md_buf[0]), &mds)) goto err; } i = 0; if (nkey) { for (;;) { if (nkey == 0) break; if (i == mds) break; if (key != NULL) *(key++) = md_buf[i]; nkey--; i++; } } if (niv && (i != mds)) { for (;;) { if (niv == 0) break; if (i == mds) break; if (iv != NULL) *(iv++) = md_buf[i]; niv--; i++; } } if ((nkey == 0) && (niv == 0)) break; } rv = type->key_len; err: EVP_MD_CTX_free(md_ctx); explicit_bzero(md_buf, sizeof md_buf); return rv; } LCRYPTO_ALIAS(EVP_BytesToKey);
