summaryrefslogtreecommitdiffstats
path: root/apps/kdf.c
blob: c036a1bf47ba9add800e5397f466e66581bc8a23 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
/*
 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <string.h>

#include "apps.h"
#include "progs.h"
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/kdf.h>
#include <openssl/params.h>

typedef enum OPTION_choice {
    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
    OPT_KDFOPT, OPT_BIN, OPT_KEYLEN, OPT_OUT,
    OPT_PROV_ENUM
} OPTION_CHOICE;

const OPTIONS kdf_options[] = {
    {OPT_HELP_STR, 1, '-', "Usage: %s [options] kdf_name\n"},

    OPT_SECTION("General"),
    {"help", OPT_HELP, '-', "Display this summary"},
    {"kdfopt", OPT_KDFOPT, 's', "KDF algorithm control parameters in n:v form"},
    {OPT_MORE_STR, 1, '-', "See 'Supported Controls' in the EVP_KDF_ docs\n"},
    {"keylen", OPT_KEYLEN, 's', "The size of the output derived key"},

    OPT_SECTION("Output"),
    {"out", OPT_OUT, '>', "Output to filename rather than stdout"},
    {"binary", OPT_BIN, '-',
        "Output in binary format (default is hexadecimal)"},

    OPT_PROV_OPTIONS,

    OPT_PARAMETERS(),
    {"kdf_name", 0, 0, "Name of the KDF algorithm"},
    {NULL}
};

int kdf_main(int argc, char **argv)
{
    int ret = 1, out_bin = 0;
    OPTION_CHOICE o;
    STACK_OF(OPENSSL_STRING) *opts = NULL;
    char *prog, *hexout = NULL;
    const char *outfile = NULL;
    unsigned char *dkm_bytes = NULL;
    size_t dkm_len = 0;
    BIO *out = NULL;
    EVP_KDF *kdf = NULL;
    EVP_KDF_CTX *ctx = NULL;

    prog = opt_init(argc, argv, kdf_options);
    while ((o = opt_next()) != OPT_EOF) {
        switch (o) {
        default:
opthelp:
            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);
            goto err;
        case OPT_HELP:
            opt_help(kdf_options);
            ret = 0;
            goto err;
        case OPT_BIN:
            out_bin = 1;
            break;
        case OPT_KEYLEN:
            dkm_len = (size_t)atoi(opt_arg());
            break;
        case OPT_OUT:
            outfile = opt_arg();
            break;
        case OPT_KDFOPT:
            if (opts == NULL)
                opts = sk_OPENSSL_STRING_new_null();
            if (opts == NULL || !sk_OPENSSL_STRING_push(opts, opt_arg()))
                goto opthelp;
            break;
        case OPT_PROV_CASES:
            if (!opt_provider(o))
                goto err;
            break;
        }
    }

    /* One argument, the KDF name. */
    argc = opt_num_rest();
    argv = opt_rest();
    if (argc != 1)
        goto opthelp;

    if ((kdf = EVP_KDF_fetch(NULL, argv[0], NULL)) == NULL) {
        BIO_printf(bio_err, "Invalid KDF name %s\n", argv[0]);
        goto opthelp;
    }

    ctx = EVP_KDF_CTX_new(kdf);
    if (ctx == NULL)
        goto err;

    if (opts != NULL) {
        int ok = 1;
        OSSL_PARAM *params =
            app_params_new_from_opts(opts, EVP_KDF_settable_ctx_params(kdf));

        if (params == NULL)
            goto err;

        if (!EVP_KDF_CTX_set_params(ctx, params)) {
            BIO_printf(bio_err, "KDF parameter error\n");
            ERR_print_errors(bio_err);
            ok = 0;
        }
        app_params_free(params);
        if (!ok)
            goto err;
    }

    out = bio_open_default(outfile, 'w', out_bin ? FORMAT_BINARY : FORMAT_TEXT);
    if (out == NULL)
        goto err;

    if (dkm_len <= 0) {
        BIO_printf(bio_err, "Invalid derived key length.\n");
        goto err;
    }
    dkm_bytes = app_malloc(dkm_len, "out buffer");
    if (dkm_bytes == NULL)
        goto err;

    if (!EVP_KDF_derive(ctx, dkm_bytes, dkm_len, NULL)) {
        BIO_printf(bio_err, "EVP_KDF_derive failed\n");
        goto err;
    }

    if (out_bin) {
        BIO_write(out, dkm_bytes, dkm_len);
    } else {
        hexout = OPENSSL_buf2hexstr(dkm_bytes, dkm_len);
        if (hexout == NULL) {
            BIO_printf(bio_err, "Memory allocation failure\n");
            goto err;
        }
        BIO_printf(out, "%s\n\n", hexout);
    }

    ret = 0;
err:
    if (ret != 0)
        ERR_print_errors(bio_err);
    OPENSSL_clear_free(dkm_bytes, dkm_len);
    sk_OPENSSL_STRING_free(opts);
    EVP_KDF_free(kdf);
    EVP_KDF_CTX_free(ctx);
    BIO_free(out);
    OPENSSL_free(hexout);
    return ret;
}