Added app for EVP_KDF

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8762)

1 files changed, 158 insertions, 0 deletions

diff --git a/apps/kdf.c b/apps/kdf.c
new file mode 100644
index 0000000000..684fd44cc0
--- /dev/null
+++ b/apps/kdf.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (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>
+
+typedef enum OPTION_choice {
+    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
+    OPT_KDFOPT, OPT_BIN, OPT_KEYLEN, OPT_OUT
+} OPTION_CHOICE;
+
+const OPTIONS kdf_options[] = {
+    {OPT_HELP_STR, 1, '-', "Usage: %s [options] kdf_name\n"},
+    {OPT_HELP_STR, 1, '-', "kdf_name\t KDF algorithm.\n"},
+    {"help", OPT_HELP, '-', "Display this summary"},
+    {"kdfopt", OPT_KDFOPT, 's', "KDF algorithm control parameters in n:v form. "
+                                "See 'Supported Controls' in the EVP_KDF_ docs"},
+    {"keylen", OPT_KEYLEN, 's', "The size of the output derived key"},
+    {"out", OPT_OUT, '>', "Output to filename rather than stdout"},
+    {"binary", OPT_BIN, '-', "Output in binary format (Default is hexadecimal "
+                             "output)"},
+    {NULL}
+};
+
+static int kdf_ctrl_string(EVP_KDF_CTX *ctx, const char *value)
+{
+    int rv;
+    char *stmp, *vtmp = NULL;
+
+    stmp = OPENSSL_strdup(value);
+    if (stmp == NULL)
+        return -1;
+    vtmp = strchr(stmp, ':');
+    if (vtmp != NULL) {
+        *vtmp = 0;
+        vtmp++;
+    }
+    rv = EVP_KDF_ctrl_str(ctx, stmp, vtmp);
+    OPENSSL_free(stmp);
+    return rv;
+}
+
+int kdf_main(int argc, char **argv)
+{
+    int ret = 1, i, id, 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_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;
+        }
+    }
+    argc = opt_num_rest();
+    argv = opt_rest();
+
+    if (argc != 1) {
+        BIO_printf(bio_err, "Invalid number of extra arguments\n");
+        goto opthelp;
+    }
+
+    id = OBJ_sn2nid(argv[0]);
+    if (id == NID_undef) {
+        BIO_printf(bio_err, "Invalid KDF name %s\n", argv[0]);
+        goto opthelp;
+    }
+
+    ctx = EVP_KDF_CTX_new_id(id);
+    if (ctx == NULL)
+        goto err;
+
+    if (opts != NULL) {
+        for (i = 0; i < sk_OPENSSL_STRING_num(opts); i++) {
+            char *opt = sk_OPENSSL_STRING_value(opts, i);
+            if (kdf_ctrl_string(ctx, opt) <= 0) {
+                BIO_printf(bio_err, "KDF parameter error '%s'\n", opt);
+                ERR_print_errors(bio_err);
+                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)) {
+        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);
+        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_CTX_free(ctx);
+    BIO_free(out);
+    OPENSSL_free(hexout);
+    return ret;
+}