1 /* crypto/evp/evp_key.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/x509.h>
62 #include <openssl/objects.h>
63 #include <openssl/evp.h>
64 #include <openssl/ui.h>
65
66 /* should be init to zeros. */
67 static char prompt_string[80];
68
69 void EVP_set_pw_prompt(const char *prompt)
70 {
71 if (prompt == NULL)
72 prompt_string[0]='\0';
73 else
74 {
75 strncpy(prompt_string,prompt,79);
76 prompt_string[79]='\0';
77 }
78 }
79
80 char *EVP_get_pw_prompt(void)
81 {
82 if (prompt_string[0] == '\0')
83 return(NULL);
84 else
85 return(prompt_string);
86 }
87
88 /* For historical reasons, the standard function for reading passwords is
89 * in the DES library -- if someone ever wants to disable DES,
90 * this function will fail */
91 int EVP_read_pw_string(char *buf, int len, const char *prompt, int verify)
92 {
93 return EVP_read_pw_string_min(buf, 0, len, prompt, verify);
94 }
95
96 int EVP_read_pw_string_min(char *buf, int min, int len, const char *prompt, int verify)
97 {
98 int ret;
99 char buff[BUFSIZ];
100 UI *ui;
101
102 if ((prompt == NULL) && (prompt_string[0] != '\0'))
103 prompt=prompt_string;
104 ui = UI_new();
105 UI_add_input_string(ui,prompt,0,buf,min,(len>=BUFSIZ)?BUFSIZ-1:len);
106 if (verify)
107 UI_add_verify_string(ui,prompt,0,
108 buff,min,(len>=BUFSIZ)?BUFSIZ-1:len,buf);
109 ret = UI_process(ui);
110 UI_free(ui);
111 OPENSSL_cleanse(buff,BUFSIZ);
112 return ret;
113 }
114
115 int EVP_BytesToKey(const EVP_CIPHER *type, const EVP_MD *md,
116 const unsigned char *salt, const unsigned char *data, int datal,
117 int count, unsigned char *key, unsigned char *iv)
118 {
119 EVP_MD_CTX c;
120 unsigned char md_buf[EVP_MAX_MD_SIZE];
121 int niv,nkey,addmd=0;
122 unsigned int mds=0,i;
123 int rv = 0;
124 nkey=type->key_len;
125 niv=type->iv_len;
126 OPENSSL_assert(nkey <= EVP_MAX_KEY_LENGTH);
127 OPENSSL_assert(niv <= EVP_MAX_IV_LENGTH);
128
129 if (data == NULL) return(nkey);
130
131 EVP_MD_CTX_init(&c);
132 for (;;)
133 {
134 if (!EVP_DigestInit_ex(&c,md, NULL))
135 return 0;
136 if (addmd++)
137 if (!EVP_DigestUpdate(&c,&(md_buf[0]),mds))
138 goto err;
139 if (!EVP_DigestUpdate(&c,data,datal))
140 goto err;
141 if (salt != NULL)
142 if (!EVP_DigestUpdate(&c,salt,PKCS5_SALT_LEN))
143 goto err;
144 if (!EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds))
145 goto err;
146
147 for (i=1; i<(unsigned int)count; i++)
148 {
149 if (!EVP_DigestInit_ex(&c,md, NULL))
150 goto err;
151 if (!EVP_DigestUpdate(&c,&(md_buf[0]),mds))
152 goto err;
153 if (!EVP_DigestFinal_ex(&c,&(md_buf[0]),&mds))
154 goto err;
155 }
156 i=0;
157 if (nkey)
158 {
159 for (;;)
160 {
161 if (nkey == 0) break;
162 if (i == mds) break;
163 if (key != NULL)
164 *(key++)=md_buf[i];
165 nkey--;
166 i++;
167 }
168 }
169 if (niv && (i != mds))
170 {
171 for (;;)
172 {
173 if (niv == 0) break;
174 if (i == mds) break;
175 if (iv != NULL)
176 *(iv++)=md_buf[i];
177 niv--;
178 i++;
179 }
180 }
181 if ((nkey == 0) && (niv == 0)) break;
182 }
183 rv = type->key_len;
184 err:
185 EVP_MD_CTX_cleanup(&c);
186 OPENSSL_cleanse(&(md_buf[0]),EVP_MAX_MD_SIZE);
187 return rv;
188 }