Update cpk

fix bug and add demo code

demos/cpk/cpk-sign.c

@@ -0,0 +1,141 @@
+/* ====================================================================
+ * Copyright (c) 2018 The GmSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the GmSSL Project.
+ *    (http://gmssl.org/)"
+ *
+ * 4. The name "GmSSL Project" must not be used to endorse or promote
+ *    products derived from this software without prior written
+ *    permission. For written permission, please contact
+ *    guanzhi1980@gmail.com.
+ *
+ * 5. Products derived from this software may not be called "GmSSL"
+ *    nor may "GmSSL" appear in their names without prior written
+ *    permission of the GmSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the GmSSL Project
+ *    (http://gmssl.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE GmSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <libgen.h>
+#include <openssl/cpk.h>
+#include <openssl/pem.h>
+
+int main(int argc, char **argv)
+{
+	int ret = -1;
+	char *prog = basename(argv[0]);
+	EVP_MD_CTX *md_ctx = NULL;
+	EVP_PKEY_CTX *pctx;
+	EVP_PKEY *sk = NULL;
+	unsigned char magic[] = "~CPK signature appended~";
+	unsigned char sig[128] = {0};
+	size_t sigsize = sizeof(sig);
+	unsigned int idlen, siglen, totallen;
+	BIO *in_bio = NULL;
+	BIO *sk_bio = NULL;
+	BIO *out_bio = NULL;
+	unsigned char buf[1024];
+	int len;
+
+	if (argc != 5) {
+		printf("usage: %s <file> <id> <sk-file> <signed-file>\n", prog);
+		return 0;
+	}
+
+	if (strlen(argv[2]) > 64) {
+		fprintf(stderr, "%s: signer's id too long\n", prog);
+		goto end;
+	}
+
+	if (!(in_bio = BIO_new_file(argv[1], "r"))
+		|| !(sk_bio = BIO_new_file(argv[3], "r"))
+		|| !(out_bio = BIO_new_file(argv[4], "w"))) {
+		ERR_print_errors_fp(stderr);
+		goto end;
+	}
+
+	if (!(sk = PEM_read_bio_PrivateKey(sk_bio, NULL, NULL, NULL))) {
+		ERR_print_errors_fp(stderr);
+		goto end;
+	}
+
+	if (!(md_ctx = EVP_MD_CTX_new())) {
+		ERR_print_errors_fp(stderr);
+		goto end;
+	}
+	if (!EVP_DigestSignInit(md_ctx, &pctx, EVP_sm3(), NULL, sk)) {
+		ERR_print_errors_fp(stderr);
+		goto end;
+	}
+	while ((len = BIO_read(in_bio, buf, sizeof(buf))) > 0) {
+		if (!EVP_DigestSignUpdate(md_ctx, buf, len)) {
+			ERR_print_errors_fp(stderr);
+			goto end;
+		}
+		if (len != BIO_write(out_bio, buf, len)) {
+			ERR_print_errors_fp(stderr);
+			goto end;
+		}
+	}
+	if (!EVP_DigestSignFinal(md_ctx, sig, &sigsize)) {
+		ERR_print_errors_fp(stderr);
+		goto end;
+	}
+
+	idlen = strlen(argv[2]);
+	siglen = (unsigned int)sigsize;
+	totallen = sizeof(idlen) + idlen + sizeof(siglen) + siglen;
+
+	if (BIO_write(out_bio, &idlen, sizeof(idlen)) != sizeof(idlen)
+		|| BIO_write(out_bio, argv[2], strlen(argv[2])) != strlen(argv[2])
+		|| BIO_write(out_bio, &siglen, sizeof(siglen)) != sizeof(siglen)
+		|| BIO_write(out_bio, sig, siglen) != siglen
+		|| BIO_write(out_bio, &totallen, sizeof(totallen)) != sizeof(totallen)
+		|| BIO_write(out_bio, magic, sizeof(magic)) != sizeof(magic)) {
+		ERR_print_errors_fp(stderr);
+		goto end;
+	}
+
+	ret = 0;
+
+end:
+	EVP_MD_CTX_free(md_ctx);
+	EVP_PKEY_free(sk);
+	BIO_free(in_bio);
+	BIO_free(sk_bio);
+	BIO_free(out_bio);
+	return ret;
+}