| 1 | /*
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| 2 | * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <stdio.h>
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| 11 | #include "internal/cryptlib.h"
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| 12 | #include <openssl/x509.h>
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| 13 | #include <openssl/objects.h>
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| 14 | #include <openssl/evp.h>
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| 15 | #include <openssl/ui.h>
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| 16 |
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| 17 | #ifndef BUFSIZ
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| 18 | # define BUFSIZ 256
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| 19 | #endif
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| 20 |
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| 21 | /* should be init to zeros. */
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| 22 | static char prompt_string[80];
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| 23 |
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| 24 | void EVP_set_pw_prompt(const char *prompt)
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| 25 | {
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| 26 | if (prompt == NULL)
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| 27 | prompt_string[0] = '\0';
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| 28 | else {
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| 29 | strncpy(prompt_string, prompt, 79);
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| 30 | prompt_string[79] = '\0';
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| 31 | }
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| 32 | }
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| 33 |
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| 34 | char *EVP_get_pw_prompt(void)
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| 35 | {
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| 36 | if (prompt_string[0] == '\0')
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| 37 | return NULL;
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| 38 | else
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| 39 | return prompt_string;
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| 40 | }
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| 41 |
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| 42 | /*
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| 43 | * For historical reasons, the standard function for reading passwords is in
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| 44 | * the DES library -- if someone ever wants to disable DES, this function
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| 45 | * will fail
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| 46 | */
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| 47 | int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
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| 48 | {
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| 49 | return EVP_read_pw_string_min(buf, 0, len, prompt, verify);
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| 50 | }
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| 51 |
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| 52 | int EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt,
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| 53 | int verify)
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| 54 | {
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| 55 | int ret = -1;
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| 56 | char buff[BUFSIZ];
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| 57 | UI *ui;
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| 58 |
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| 59 | if ((prompt == NULL) && (prompt_string[0] != '\0'))
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| 60 | prompt = prompt_string;
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| 61 | ui = UI_new();
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| 62 | if (ui == NULL)
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| 63 | return ret;
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| 64 | if (UI_add_input_string(ui, prompt, 0, buf, min,
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| 65 | (len >= BUFSIZ) ? BUFSIZ - 1 : len) < 0
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| 66 | || (verify
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| 67 | && UI_add_verify_string(ui, prompt, 0, buff, min,
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| 68 | (len >= BUFSIZ) ? BUFSIZ - 1 : len,
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| 69 | buf) < 0))
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| 70 | goto end;
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| 71 | ret = UI_process(ui);
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| 72 | OPENSSL_cleanse(buff, BUFSIZ);
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| 73 | end:
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| 74 | UI_free(ui);
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| 75 | return ret;
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| 76 | }
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| 77 |
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| 78 | int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
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| 79 | const unsigned char *salt, const unsigned char *data,
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| 80 | int datal, int count, unsigned char *key,
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| 81 | unsigned char *iv)
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| 82 | {
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| 83 | EVP_MD_CTX *c;
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| 84 | unsigned char md_buf[EVP_MAX_MD_SIZE];
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| 85 | int niv, nkey, addmd = 0;
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| 86 | unsigned int mds = 0, i;
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| 87 | int rv = 0;
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| 88 | nkey = EVP_CIPHER_get_key_length(type);
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| 89 | niv = EVP_CIPHER_get_iv_length(type);
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| 90 | OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH);
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| 91 | OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH);
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| 92 |
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| 93 | if (data == NULL)
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| 94 | return nkey;
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| 95 |
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| 96 | c = EVP_MD_CTX_new();
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| 97 | if (c == NULL)
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| 98 | goto err;
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| 99 | for (;;) {
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| 100 | if (!EVP_DigestInit_ex(c, md, NULL))
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| 101 | goto err;
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| 102 | if (addmd++)
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| 103 | if (!EVP_DigestUpdate(c, &(md_buf[0]), mds))
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| 104 | goto err;
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| 105 | if (!EVP_DigestUpdate(c, data, datal))
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| 106 | goto err;
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| 107 | if (salt != NULL)
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| 108 | if (!EVP_DigestUpdate(c, salt, PKCS5_SALT_LEN))
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| 109 | goto err;
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| 110 | if (!EVP_DigestFinal_ex(c, &(md_buf[0]), &mds))
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| 111 | goto err;
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| 112 |
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| 113 | for (i = 1; i < (unsigned int)count; i++) {
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| 114 | if (!EVP_DigestInit_ex(c, md, NULL))
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| 115 | goto err;
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| 116 | if (!EVP_DigestUpdate(c, &(md_buf[0]), mds))
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| 117 | goto err;
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| 118 | if (!EVP_DigestFinal_ex(c, &(md_buf[0]), &mds))
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| 119 | goto err;
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| 120 | }
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| 121 | i = 0;
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| 122 | if (nkey) {
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| 123 | for (;;) {
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| 124 | if (nkey == 0)
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| 125 | break;
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| 126 | if (i == mds)
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| 127 | break;
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| 128 | if (key != NULL)
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| 129 | *(key++) = md_buf[i];
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| 130 | nkey--;
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| 131 | i++;
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| 132 | }
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| 133 | }
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| 134 | if (niv && (i != mds)) {
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| 135 | for (;;) {
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| 136 | if (niv == 0)
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| 137 | break;
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| 138 | if (i == mds)
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| 139 | break;
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| 140 | if (iv != NULL)
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| 141 | *(iv++) = md_buf[i];
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| 142 | niv--;
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| 143 | i++;
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| 144 | }
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| 145 | }
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| 146 | if ((nkey == 0) && (niv == 0))
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| 147 | break;
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| 148 | }
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| 149 | rv = EVP_CIPHER_get_key_length(type);
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| 150 | err:
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| 151 | EVP_MD_CTX_free(c);
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| 152 | OPENSSL_cleanse(md_buf, sizeof(md_buf));
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| 153 | return rv;
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| 154 | }
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