Add SM3 LMS/HSS hash-based post-quantum signatures

tools/sm3lmsverify.c

@@ -0,0 +1,157 @@
+/*
+ *  Copyright 2014-2025 The GmSSL Project. All Rights Reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the License); you may
+ *  not use this file except in compliance with the License.
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <gmssl/mem.h>
+#include <gmssl/error.h>
+#include <gmssl/sm3_lms.h>
+
+static const char *usage = "-pubkey file [-in file] -sig file [-verbose]\n";
+
+static const char *options =
+"Options\n"
+"    -pubkey file                Input public key file\n"
+"    -in file                    Input data file (if not using stdin)\n"
+"    -sig file                   Input signature file\n"
+"    -verbose                    Print public key and signature\n"
+"\n";
+
+int sm3lmsverify_main(int argc, char **argv)
+{
+	int ret = 1;
+	char *prog = argv[0];
+	char *pubkeyfile = NULL;
+	char *infile = NULL;
+	char *sigfile = NULL;
+	int verbose = 0;
+	FILE *pubkeyfp = NULL;
+	FILE *infp = stdin;
+	FILE *sigfp = NULL;
+	uint8_t pubkeybuf[SM3_LMS_PUBLIC_KEY_SIZE];
+	size_t pubkeylen = SM3_LMS_PUBLIC_KEY_SIZE;
+	const uint8_t *cp = pubkeybuf;
+	uint8_t sig[SM3_LMS_SIGNATURE_MAX_SIZE];
+	size_t siglen;
+	SM3_LMS_KEY key;
+	SM3_LMS_SIGN_CTX ctx;
+	int vr;
+
+	argc--;
+	argv++;
+
+	if (argc < 1) {
+		fprintf(stderr, "usage: gmssl %s %s\n", prog, usage);
+		return 1;
+	}
+
+	while (argc > 0) {
+		if (!strcmp(*argv, "-help")) {
+			printf("usage: %s %s\n", prog, usage);
+			printf("%s\n", options);
+			ret = 0;
+			goto end;
+		} else if (!strcmp(*argv, "-pubkey")) {
+			if (--argc < 1) goto bad;
+			pubkeyfile = *(++argv);
+			if (!(pubkeyfp = fopen(pubkeyfile, "rb"))) {
+				fprintf(stderr, "%s: open '%s' failure: %s\n", prog, pubkeyfile, strerror(errno));
+				goto end;
+			}
+		} else if (!strcmp(*argv, "-in")) {
+			if (--argc < 1) goto bad;
+			infile = *(++argv);
+			if (!(infp = fopen(infile, "rb"))) {
+				fprintf(stderr, "%s: open '%s' failure: %s\n", prog, infile, strerror(errno));
+				goto end;
+			}
+		} else if (!strcmp(*argv, "-sig")) {
+			if (--argc < 1) goto bad;
+			sigfile = *(++argv);
+			if (!(sigfp = fopen(sigfile, "rb"))) {
+				fprintf(stderr, "%s: open '%s' failure: %s\n", prog, sigfile, strerror(errno));
+				goto end;
+			}
+		} else if (!strcmp(*argv, "-verbose")) {
+			verbose = 1;
+		} else {
+			fprintf(stderr, "%s: illegal option '%s'\n", prog, *argv);
+			goto end;
+bad:
+			fprintf(stderr, "%s: `%s` option value missing\n", prog, *argv);
+			goto end;
+		}
+
+		argc--;
+		argv++;
+	}
+
+	if (!pubkeyfile) {
+		fprintf(stderr, "%s: `-key` option required\n", prog);
+		goto end;
+	}
+	if (!sigfile) {
+		fprintf(stderr, "%s: `-sig` option required\n", prog);
+		goto end;
+	}
+
+	if (fread(pubkeybuf, 1, pubkeylen, pubkeyfp) != pubkeylen) {
+		fprintf(stderr, "%s: read public key failure\n", prog);
+		goto end;
+	}
+	if (sm3_lms_public_key_from_bytes(&key, &cp, &pubkeylen) != 1) {
+		error_print();
+		goto end;
+	}
+	if (verbose) {
+		sm3_lms_public_key_print(stderr, 0, 0, "lms_public_key", &key.public_key);
+	}
+
+	// read signature even if signature not compatible with the public key
+	if ((siglen = fread(sig, 1, SM3_LMS_SIGNATURE_MAX_SIZE, sigfp)) <= 0) {
+		fprintf(stderr, "%s: read signature failure\n", prog);
+		goto end;
+	}
+	if (verbose) {
+		sm3_lms_signature_print(stderr, 0, 0, "lms_signature", sig, siglen);
+	}
+	if (sm3_lms_verify_init(&ctx, &key, sig, siglen) != 1) {
+		error_print();
+		goto end;
+	}
+
+	while (1) {
+		uint8_t buf[1024];
+		size_t len = fread(buf, 1, sizeof(buf), infp);
+		if (len == 0) {
+			break;
+		}
+		if (sm3_lms_verify_update(&ctx, buf, len) != 1) {
+			error_print();
+			goto end;
+		}
+	}
+	if ((vr = sm3_lms_verify_finish(&ctx)) < 0) {
+		error_print();
+		goto end;
+	}
+	fprintf(stdout, "verify : %s\n", vr == 1 ? "success" : "failure");
+	if (vr == 1) {
+		ret = 0;
+	}
+
+end:
+	if (pubkeyfp) fclose(pubkeyfp);
+	if (infp && infp != stdin) fclose(infp);
+	if (sigfp) fclose(sigfp);
+	return ret;
+}