增加了sm2keyparse部分 (#1423)

* Update gmssl.c

添加sm2keyparse功能，以十六进制明文查看SM2的公钥和私钥。

* Create sm2keyparse.c

增加sm2keyparse部分。

* Update CMakeLists.txt

增加tools/sm2keyparse.c

* Update sm2keyparse.c

CMakeLists.txt

@@ -83,6 +83,7 @@ set(tools
 	tools/sm3.c
 	tools/sm3hmac.c
 	tools/sm2keygen.c
+	tools/sm2keyparse.c
 	tools/sm2sign.c
 	tools/sm2verify.c
 	tools/sm2encrypt.c

tools/gmssl.c

@@ -28,6 +28,7 @@ extern int reqgen_main(int argc, char **argv);
 extern int reqparse_main(int argc, char **argv);
 extern int reqsign_main(int argc, char **argv);
 extern int sm2keygen_main(int argc, char **argv);
+extern int sm2keyparse_main(int argc,char **argv);
 extern int sm2sign_main(int argc, char **argv);
 extern int sm2verify_main(int argc, char **argv);
 extern int sm2encrypt_main(int argc, char **argv);
@@ -66,6 +67,7 @@ static const char *options =
 	"  version         Print version\n"
 	"  rand            Generate random bytes\n"
 	"  sm2keygen       Generate SM2 keypair\n"
+	"  sm2keyparse     Parse SM2 key to hex plaintext\n"
 	"  sm2sign         Generate SM2 signature\n"
 	"  sm2verify       Verify SM2 signature\n"
 	"  sm2encrypt      Encrypt with SM2 public key\n"
@@ -157,6 +159,8 @@ int main(int argc, char **argv)
 			return pbkdf2_main(argc, argv);
 		} else if (!strcmp(*argv, "sm2keygen")) {
 			return sm2keygen_main(argc, argv);
+		} else if (!strcmp(*argv, "sm2keyparse")) {
+			return sm2keyparse_main(argc, argv);
 		} else if (!strcmp(*argv, "sm2sign")) {
 			return sm2sign_main(argc, argv);
 		} else if (!strcmp(*argv, "sm2verify")) {

tools/sm2keyparse.c

@@ -0,0 +1,135 @@
+/*
+ *  Copyright 2014-2022 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/sm2.h>
+
+
+static const char *usage = "-in private.pem -pass pass / -pubin public.pem";
+
+static const char *options =
+"Options\n"
+"    -pass pass                  Password to encrypt the private key\n"
+"    -in pem                     Input private key in PEM format\n"
+"    -pubin pem                  Input public key in PEM format\n"
+"\n";
+
+
+int sm2keyparse_main(int argc, char **argv)
+{
+	int ret = 1;
+	char *prog = argv[0];
+	char *pass = NULL;
+	char *pubinfile = NULL;
+    char *infile = NULL;
+	FILE *pubinfp = NULL;
+    FILE *infp = NULL;
+	SM2_KEY key;
+
+	argc--;
+	argv++;
+
+	if (argc < 1) {
+		fprintf(stderr, "usage: %s %s\n", prog, options);
+		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,"-pubin")){
+            if (--argc<1) goto bad;
+            pubinfile=(*++argv);
+            if (!(pubinfp = fopen(pubinfile, "rb"))) {
+				fprintf(stderr, "%s: open '%s' failure : %s\n", prog, pubinfile, strerror(errno));
+				goto end;
+			}
+            goto pubkey;
+        } 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, "-pass")) {
+			if (--argc < 1) goto bad;
+			pass = *(++argv);
+		} 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 (!pass) {
+		fprintf(stderr, "%s: `-pass` option required\n", prog);
+		goto end;
+	}
+
+	if (sm2_private_key_info_decrypt_from_pem(&key, pass, infp) != 1) {
+		fprintf(stderr, "%s: private key decryption failure\n", prog);
+		goto end;
+	} else {
+        printf("\n");
+        for(int i=0;i<4;i++){
+            for(int j=0;j<8;j++){
+                printf("%02x ",key.private_key[i*8+j]);
+            }
+            printf("\n");
+        }
+        printf("\n");
+    }
+
+    if(pubinfile){
+pubkey:
+        if (sm2_public_key_info_from_pem(&key, pubinfp) != 1) {
+                fprintf(stderr, "%s: parse public key failed\n", prog);
+                goto end;
+        } else {
+            printf("\nx:\n");
+            for(int i=0;i<4;i++){
+                for(int j=0;j<8;j++){
+                    printf("%02x ",key.public_key.x[i*8+j]);
+                }
+                printf("\n");
+            }
+            printf("\n");
+
+            printf("y:\n");
+            for(int i=0;i<4;i++){
+                for(int j=0;j<8;j++){
+                    printf("%02x ",key.public_key.y[i*8+j]);
+                }
+                printf("\n");
+            }
+            printf("\n");
+        }
+    }
+
+end:
+	gmssl_secure_clear(&key, sizeof(key));
+	if (infile && infp) fclose(infp);
+	if (pubinfile && pubinfp) fclose(pubinfp);
+	return ret;
+}
+