Add keyconv utility for decrypting and converting private keys.

Makefile

@@ -1,7 +1,7 @@
 LIBS=-lpcre -lcrypto -lm -lpthread
 CFLAGS=-ggdb -O3 -Wall
-OBJS=vanitygen.o oclvanitygen.o pattern.o util.o
-PROGS=vanitygen
+OBJS=vanitygen.o oclvanitygen.o keyconv.o pattern.o util.o
+PROGS=vanitygen keyconv
 
 all: $(PROGS)
 
@@ -11,5 +11,8 @@ vanitygen: vanitygen.o pattern.o util.o
 oclvanitygen: oclvanitygen.o pattern.o util.o
 	$(CC) $^ -o $@ $(CFLAGS) $(LIBS) -lOpenCL
 
+keyconv: keyconv.o util.o
+	$(CC) $^ -o $@ $(CFLAGS) $(LIBS)
+
 clean:
 	rm -f $(OBJS) $(PROGS) $(TESTS)

Makefile.Win32

@@ -7,7 +7,7 @@ OPENCL_INCLUDE = /I$(OPENCL_DIR)\include
 OPENCL_LIBS = $(OPENCL_DIR)\lib\x86\OpenCL.lib
 CFLAGS = /D_WIN32 /DPTW32_STATIC_LIB /DPCRE_STATIC /I$(OPENSSL_DIR)\include /I$(PTHREADS_DIR) /I$(PCRE_DIR)
 LIBS = $(OPENSSL_DIR)\lib\libeay32.lib $(PTHREADS_DIR)\pthreadVC2.lib $(PCRE_DIR)\pcre.lib ws2_32.lib
-OBJS = vanitygen.obj oclvanitygen.obj pattern.obj util.obj winglue.obj
+OBJS = vanitygen.obj oclvanitygen.obj keyconv.obj pattern.obj util.obj winglue.obj
 
 all: vanitygen.exe
 
@@ -17,6 +17,9 @@ vanitygen.exe: vanitygen.obj pattern.obj util.obj winglue.obj
 oclvanitygen.exe: oclvanitygen.obj pattern.obj util.obj winglue.obj
 	link /nologo /out:$@ $** $(LIBS) $(OPENCL_LIBS)
 
+keyconv.exe: keyconv.obj util.obj winglue.obj
+	link /nologo /out:$@ $** $(LIBS) $(OPENCL_LIBS)
+
 .c.obj:
 	@$(CC) /nologo $(CFLAGS) /c /Tp$< /Fo$@
 

Makefile.osx

@@ -1,7 +1,7 @@
 LIBS=-lpcre -lcrypto -lm -lpthread
 CFLAGS=-ggdb -O3 -Wall
-OBJS=vanitygen.o oclvanitygen.o pattern.o util.o
-PROGS=vanitygen
+OBJS=vanitygen.o oclvanitygen.o keyconv.o pattern.o util.o
+PROGS=vanitygen keyconv
 TESTS=
 
 all: $(PROGS)
@@ -12,5 +12,8 @@ vanitygen: vanitygen.o pattern.o util.o
 oclvanitygen: oclvanitygen.o pattern.o util.o
 	$(CC) $^ -o $@ $(CFLAGS) $(LIBS) -framework OpenCL
 
+keyconv: keyconv.o util.o
+	$(CC) $^ -o $@ $(CFLAGS) $(LIBS)
+
 clean:
 	rm -f $(OBJS) $(PROGS) $(TESTS)

keyconv.c

@@ -0,0 +1,157 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <assert.h>
+
+#include <openssl/evp.h>
+#include <openssl/bn.h>
+#include <openssl/ec.h>
+#include <openssl/obj_mac.h>
+
+#if !defined(_WIN32)
+#include <unistd.h>
+#else
+#include "winglue.h"
+#endif
+
+#include "util.h"
+
+const char *version = "0.17";
+
+
+static void
+usage(const char *progname)
+{
+	fprintf(stderr,
+"Vanitygen keyconv %s\n"
+"Usage: %s [-8] [-e|-E <password>] [<key>]\n"
+"-8            Output key in PKCS#8 form\n"
+"-e            Encrypt output key, prompt for password\n"
+"-E <password> Encrypt output key with <password> (UNSAFE)\n",
+		version, progname);
+}
+
+
+int
+main(int argc, char **argv)
+{
+	char pwbuf[128];
+	char ecprot[128];
+	char pbuf[1024];
+	const char *key_in;
+	const char *pass_in = NULL;
+	EC_KEY *pkey;
+	int parameter_group = -1;
+	int privtype, addrtype;
+	int pkcs8 = 0;
+	int pass_prompt = 0;
+	int opt;
+	int res;
+
+	while ((opt = getopt(argc, argv, "8E:e")) != -1) {
+		switch (opt) {
+		case '8':
+			pkcs8 = 1;
+			break;
+		case 'E':
+			if (pass_prompt) {
+				usage(argv[0]);
+				return 1;
+			}
+			pass_in = optarg;
+			if (!vg_check_password_complexity(pass_in, 1))
+				fprintf(stderr,
+					"WARNING: Using weak password\n");
+			break;
+		case 'e':
+			if (pass_in) {
+				usage(argv[0]);
+				return 1;
+			}
+			pass_prompt = 1;
+			break;
+		default:
+			usage(argv[0]);
+			return 1;
+		}
+	}
+
+	if (optind >= argc) {
+		res = fread(pbuf, 1, sizeof(pbuf) - 1, stdin);
+		pbuf[res] = '\0';
+		key_in = pbuf;
+	} else {
+		key_in = argv[optind];
+	}
+
+	OpenSSL_add_all_algorithms();
+
+	pkey = EC_KEY_new_by_curve_name(NID_secp256k1);
+
+	res = vg_decode_privkey_any(pkey, &privtype, key_in, NULL);
+	if (res < 0) {
+		if (EVP_read_pw_string(pwbuf, sizeof(pwbuf),
+				       "Enter import password:", 0) ||
+		    !vg_decode_privkey_any(pkey, &privtype, key_in, pwbuf))
+			return 1;
+	}
+
+	if (!res) {
+		fprintf(stderr, "ERROR: Unrecognized key format\n");
+		return 1;
+	}
+
+	if (pass_prompt) {
+		res = EVP_read_pw_string(pwbuf, sizeof(pwbuf),
+					 "Enter password:", 1);
+		if (res)
+			return 1;
+		pass_in = pwbuf;
+		if (!vg_check_password_complexity(pwbuf, 1))
+			fprintf(stderr, "WARNING: Using weak password\n");
+	}
+
+	switch (privtype) {
+	case 128: addrtype = 0; break;
+	case 239: addrtype = 111; break;
+	default:  addrtype = 0; break;
+	}
+
+	if (pkcs8) {
+		res = vg_pkcs8_encode_privkey(pbuf, sizeof(pbuf),
+					      pkey, pass_in);
+		if (!res) {
+			fprintf(stderr,
+				"ERROR: Could not encode private key\n");
+			return 1;
+		}
+		printf("%s", pbuf);
+	}
+
+	else if (pass_in) {
+		res = vg_protect_encode_privkey(ecprot, pkey, privtype,
+						parameter_group, pwbuf);
+
+		if (!res) {
+			fprintf(stderr, "ERROR: could not password-protect "
+				"private key\n");
+			return 1;
+		}
+
+		vg_encode_address(pkey, addrtype, pwbuf);
+		printf("Address: %s\n", pwbuf);
+		printf("Protkey: %s\n", ecprot);
+	}
+
+	else {
+		vg_encode_address(pkey, addrtype, ecprot);
+		printf("Address: %s\n", ecprot);
+		vg_encode_privkey(pkey, privtype, ecprot);
+		printf("Privkey: %s\n", ecprot);
+	}
+
+	OPENSSL_cleanse(pwbuf, sizeof(pwbuf));
+
+	EC_KEY_free(pkey);
+	return 0;
+}