1 /*
2 * Copyright 1995-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/x509.h>
13 #include <openssl/objects.h>
14 #include <openssl/evp.h>
15 #include <openssl/ui.h>
16
17 #ifndef BUFSIZ
18 # define BUFSIZ 256
19 #endif
20
21 /* should be init to zeros. */
22 static char prompt_string[80];
23
EVP_set_pw_prompt(const char * prompt)24 void EVP_set_pw_prompt(const char *prompt)
25 {
26 if (prompt == NULL)
27 prompt_string[0] = '\0';
28 else {
29 strncpy(prompt_string, prompt, 79);
30 prompt_string[79] = '\0';
31 }
32 }
33
EVP_get_pw_prompt(void)34 char *EVP_get_pw_prompt(void)
35 {
36 if (prompt_string[0] == '\0')
37 return NULL;
38 else
39 return prompt_string;
40 }
41
42 /*
43 * For historical reasons, the standard function for reading passwords is in
44 * the DES library -- if someone ever wants to disable DES, this function
45 * will fail
46 */
EVP_read_pw_string(char * buf,int len,const char * prompt,int verify)47 int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
48 {
49 return EVP_read_pw_string_min(buf, 0, len, prompt, verify);
50 }
51
EVP_read_pw_string_min(char * buf,int min,int len,const char * prompt,int verify)52 int EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt,
53 int verify)
54 {
55 int ret = -1;
56 char buff[BUFSIZ];
57 UI *ui;
58
59 if ((prompt == NULL) && (prompt_string[0] != '\0'))
60 prompt = prompt_string;
61 ui = UI_new();
62 if (ui == NULL)
63 return ret;
64 if (UI_add_input_string(ui, prompt, 0, buf, min,
65 (len >= BUFSIZ) ? BUFSIZ - 1 : len) < 0
66 || (verify
67 && UI_add_verify_string(ui, prompt, 0, buff, min,
68 (len >= BUFSIZ) ? BUFSIZ - 1 : len,
69 buf) < 0))
70 goto end;
71 ret = UI_process(ui);
72 OPENSSL_cleanse(buff, BUFSIZ);
73 end:
74 UI_free(ui);
75 return ret;
76 }
77
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)78 int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
79 const unsigned char *salt, const unsigned char *data,
80 int datal, int count, unsigned char *key,
81 unsigned char *iv)
82 {
83 EVP_MD_CTX *c;
84 unsigned char md_buf[EVP_MAX_MD_SIZE];
85 int niv, nkey, addmd = 0;
86 unsigned int mds = 0, i;
87 int rv = 0;
88 nkey = EVP_CIPHER_get_key_length(type);
89 niv = EVP_CIPHER_get_iv_length(type);
90 OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH);
91 OPENSSL_assert(niv >= 0 && niv <= EVP_MAX_IV_LENGTH);
92
93 if (data == NULL)
94 return nkey;
95
96 c = EVP_MD_CTX_new();
97 if (c == NULL)
98 goto err;
99 for (;;) {
100 if (!EVP_DigestInit_ex(c, md, NULL))
101 goto err;
102 if (addmd++)
103 if (!EVP_DigestUpdate(c, &(md_buf[0]), mds))
104 goto err;
105 if (!EVP_DigestUpdate(c, data, datal))
106 goto err;
107 if (salt != NULL)
108 if (!EVP_DigestUpdate(c, salt, PKCS5_SALT_LEN))
109 goto err;
110 if (!EVP_DigestFinal_ex(c, &(md_buf[0]), &mds))
111 goto err;
112
113 for (i = 1; i < (unsigned int)count; i++) {
114 if (!EVP_DigestInit_ex(c, md, NULL))
115 goto err;
116 if (!EVP_DigestUpdate(c, &(md_buf[0]), mds))
117 goto err;
118 if (!EVP_DigestFinal_ex(c, &(md_buf[0]), &mds))
119 goto err;
120 }
121 i = 0;
122 if (nkey) {
123 for (;;) {
124 if (nkey == 0)
125 break;
126 if (i == mds)
127 break;
128 if (key != NULL)
129 *(key++) = md_buf[i];
130 nkey--;
131 i++;
132 }
133 }
134 if (niv && (i != mds)) {
135 for (;;) {
136 if (niv == 0)
137 break;
138 if (i == mds)
139 break;
140 if (iv != NULL)
141 *(iv++) = md_buf[i];
142 niv--;
143 i++;
144 }
145 }
146 if ((nkey == 0) && (niv == 0))
147 break;
148 }
149 rv = EVP_CIPHER_get_key_length(type);
150 err:
151 EVP_MD_CTX_free(c);
152 OPENSSL_cleanse(md_buf, sizeof(md_buf));
153 return rv;
154 }
155
