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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/evp/evp_key.c
1 /* crypto/evp/evp_key.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 #include <openssl/x509.h>
62 #include <openssl/objects.h>
63 #include <openssl/evp.h>
64 #include <openssl/ui.h>
66 /* should be init to zeros. */
67 static char prompt_string
[80];
69 void EVP_set_pw_prompt(const char *prompt
)
72 prompt_string
[0]='\0';
75 strncpy(prompt_string
,prompt
,79);
76 prompt_string
[79]='\0';
80 char *EVP_get_pw_prompt(void)
82 if (prompt_string
[0] == '\0')
85 return(prompt_string
);
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
)
97 if ((prompt
== NULL
) && (prompt_string
[0] != '\0'))
100 UI_add_input_string(ui
,prompt
,0,buf
,0,(len
>=BUFSIZ
)?BUFSIZ
-1:len
);
102 UI_add_verify_string(ui
,prompt
,0,
103 buff
,0,(len
>=BUFSIZ
)?BUFSIZ
-1:len
,buf
);
104 ret
= UI_process(ui
);
106 OPENSSL_cleanse(buff
,BUFSIZ
);
110 int EVP_BytesToKey(const EVP_CIPHER
*type
, const EVP_MD
*md
,
111 const unsigned char *salt
, const unsigned char *data
, size_t datal
,
112 int count
, unsigned char *key
, unsigned char *iv
)
115 unsigned char md_buf
[EVP_MAX_MD_SIZE
];
116 int niv
,nkey
,addmd
=0;
117 unsigned int mds
=0,i
;
121 OPENSSL_assert(nkey
<= EVP_MAX_KEY_LENGTH
);
122 OPENSSL_assert(niv
<= EVP_MAX_IV_LENGTH
);
124 if (data
== NULL
) return(nkey
);
129 if (!EVP_DigestInit_ex(&c
,md
, NULL
))
132 EVP_DigestUpdate(&c
,&(md_buf
[0]),mds
);
133 EVP_DigestUpdate(&c
,data
,datal
);
135 EVP_DigestUpdate(&c
,salt
,PKCS5_SALT_LEN
);
136 EVP_DigestFinal_ex(&c
,&(md_buf
[0]),&mds
);
138 for (i
=1; i
<(unsigned int)count
; i
++)
140 EVP_DigestInit_ex(&c
,md
, NULL
);
141 EVP_DigestUpdate(&c
,&(md_buf
[0]),mds
);
142 EVP_DigestFinal_ex(&c
,&(md_buf
[0]),&mds
);
149 if (nkey
== 0) break;
157 if (niv
&& (i
!= mds
))
169 if ((nkey
== 0) && (niv
== 0)) break;
171 EVP_MD_CTX_cleanup(&c
);
172 OPENSSL_cleanse(&(md_buf
[0]),EVP_MAX_MD_SIZE
);
173 return(type
->key_len
);