/* crypto/evp/evp_key.c */ /* 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 #include "cryptlib.h" #include #include #include #include /* 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 { strncpy(prompt_string, prompt, 79); prompt_string[79] = '\0'; } } char *EVP_get_pw_prompt(void) { if (prompt_string[0] == '\0') return (NULL); else return (prompt_string); } /* * For historical reasons, the standard function for reading passwords is in * the DES library -- if someone ever wants to disable DES, this function * will fail */ int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify) { int ret; char buff[BUFSIZ]; UI *ui; if ((prompt == NULL) && (prompt_string[0] != '\0')) prompt = prompt_string; ui = UI_new(); UI_add_input_string(ui, prompt, 0, buf, 0, (len >= BUFSIZ) ? BUFSIZ - 1 : len); if (verify) UI_add_verify_string(ui, prompt, 0, buff, 0, (len >= BUFSIZ) ? BUFSIZ - 1 : len, buf); ret = UI_process(ui); UI_free(ui); OPENSSL_cleanse(buff, BUFSIZ); return ret; } 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 c; unsigned char md_buf[EVP_MAX_MD_SIZE]; int niv, nkey, addmd = 0; unsigned int mds = 0, i; nkey = type->key_len; niv = type->iv_len; OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH); OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH); if (data == NULL) return (nkey); EVP_MD_CTX_init(&c); for (;;) { if (!EVP_DigestInit_ex(&c, md, NULL)) return 0; if (addmd++) EVP_DigestUpdate(&c, &(md_buf[0]), mds); EVP_DigestUpdate(&c, data, datal); if (salt != NULL) EVP_DigestUpdate(&c, salt, PKCS5_SALT_LEN); EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds); for (i = 1; i < (unsigned int)count; i++) { EVP_DigestInit_ex(&c, md, NULL); EVP_DigestUpdate(&c, &(md_buf[0]), mds); EVP_DigestFinal_ex(&c, &(md_buf[0]), &mds); } 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; } EVP_MD_CTX_cleanup(&c); OPENSSL_cleanse(&(md_buf[0]), EVP_MAX_MD_SIZE); return (type->key_len); }