diff --git a/tests/sm3test.c b/tests/sm3test.c
index a12d8939..100fbaac 100644
--- a/tests/sm3test.c
+++ b/tests/sm3test.c
@@ -53,130 +53,132 @@
 #include <stdint.h>
 #include <gmssl/sm3.h>
 #include <gmssl/hex.h>
+#include <gmssl/error.h>
 
-static char *testhex[] = {
-	/* 0 "abc" */
-	"616263",
-	/* 1 "abcd" 16 times */
-	"6162636461626364616263646162636461626364616263646162636461626364"
-	"6162636461626364616263646162636461626364616263646162636461626364",
-	/* 2 p.57 ZA */
-	"0090"
-	"414C494345313233405941484F4F2E434F4D"
-	"787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498"
-	"63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A"
-	"421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D"
-	"0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2"
-	"0AE4C7798AA0F119471BEE11825BE46202BB79E2A5844495E97C04FF4DF2548A"
-	"7C0240F88F1CD4E16352A73C17B7F16F07353E53A176D684A9FE0C6BB798E857",
-	/* 3 p.59 ZA */
-	"0090"
-	"414C494345313233405941484F4F2E434F4D"
-	"000000000000000000000000000000000000000000000000000000000000000000"
-	"00E78BCD09746C202378A7E72B12BCE00266B9627ECB0B5A25367AD1AD4CC6242B"
-	"00CDB9CA7F1E6B0441F658343F4B10297C0EF9B6491082400A62E7A7485735FADD"
-	"013DE74DA65951C4D76DC89220D5F7777A611B1C38BAE260B175951DC8060C2B3E"
-	"0165961645281A8626607B917F657D7E9382F1EA5CD931F40F6627F357542653B2"
-	"01686522130D590FB8DE635D8FCA715CC6BF3D05BEF3F75DA5D543454448166612",
-	/* 4 p.72 ZA */
-	"0090"
-	"414C494345313233405941484F4F2E434F4D"
-	"787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498"
-	"63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A"
-	"421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D"
-	"0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2"
-	"3099093BF3C137D8FCBBCDF4A2AE50F3B0F216C3122D79425FE03A45DBFE1655"
-	"3DF79E8DAC1CF0ECBAA2F2B49D51A4B387F2EFAF482339086A27A8E05BAED98B",
-	/* 5 p.72 ZB */
-	"0088"
-	"42494C4C343536405941484F4F2E434F4D"
-	"787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498"
-	"63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A"
-	"421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D"
-	"0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2"
-	"245493D446C38D8CC0F118374690E7DF633A8A4BFB3329B5ECE604B2B4F37F43"
-	"53C0869F4B9E17773DE68FEC45E14904E0DEA45BF6CECF9918C85EA047C60A4C",
-	/* 6 p.75 ZA */
-	"0090"
-	"414C494345313233405941484F4F2E434F4D"
-	"000000000000000000000000000000000000000000000000000000000000000000"
-	"00E78BCD09746C202378A7E72B12BCE00266B9627ECB0B5A25367AD1AD4CC6242B"
-	"00CDB9CA7F1E6B0441F658343F4B10297C0EF9B6491082400A62E7A7485735FADD"
-	"013DE74DA65951C4D76DC89220D5F7777A611B1C38BAE260B175951DC8060C2B3E"
-	"008E3BDB2E11F9193388F1F901CCC857BF49CFC065FB38B9069CAAE6D5AFC3592F"
-	"004555122AAC0075F42E0A8BBD2C0665C789120DF19D77B4E3EE4712F598040415",
-	/* 7 p.76 ZB */
-	"0088"
-	"42494C4C343536405941484F4F2E434F4D"
-	"000000000000000000000000000000000000000000000000000000000000000000"
-	"00E78BCD09746C202378A7E72B12BCE00266B9627ECB0B5A25367AD1AD4CC6242B"
-	"00CDB9CA7F1E6B0441F658343F4B10297C0EF9B6491082400A62E7A7485735FADD"
-	"013DE74DA65951C4D76DC89220D5F7777A611B1C38BAE260B175951DC8060C2B3E"
-	"0034297DD83AB14D5B393B6712F32B2F2E938D4690B095424B89DA880C52D4A7D9"
-	"0199BBF11AC95A0EA34BBD00CA50B93EC24ACB68335D20BA5DCFE3B33BDBD2B62D",
-	/* 8 TopsecCA cert ZA */
-	"0080"
-	"31323334353637383132333435363738"
-	"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC"
-	"28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93"
-	"32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7"
-	"BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"
-	"D69C2F1EEC3BFB6B95B30C28085C77B125D77A9C39525D8190768F37D6B205B5"
-	"89DCD316BBE7D89A9DC21917F17799E698531F5E6E3E10BD31370B259C3F81C3",
-	/* 9 */
-	"4D38D2958CA7FD2CFAE3AF04486959CF92C8EF48E8B83A05C112E739D5F181D0"
-	"3082020CA003020102020900"
-	"AF28725D98D33143300C06082A811CCF"
-	"550183750500307D310B300906035504"
-	"060C02636E310B300906035504080C02"
-	"626A310B300906035504070C02626A31"
-	"0F300D060355040A0C06746F70736563"
-	"310F300D060355040B0C06746F707365"
-	"633111300F06035504030C08546F7073"
-	"65634341311F301D06092A864886F70D"
-	"0109010C10626A40746F707365632E63"
-	"6F6D2E636E301E170D31323036323430"
-	"37353433395A170D3332303632303037"
-	"353433395A307D310B30090603550406"
-	"0C02636E310B300906035504080C0262"
-	"6A310B300906035504070C02626A310F"
-	"300D060355040A0C06746F7073656331"
-	"0F300D060355040B0C06746F70736563"
-	"3111300F06035504030C08546F707365"
-	"634341311F301D06092A864886F70D01"
-	"09010C10626A40746F707365632E636F"
-	"6D2E636E3059301306072A8648CE3D02"
-	"0106082A811CCF5501822D03420004D6"
-	"9C2F1EEC3BFB6B95B30C28085C77B125"
-	"D77A9C39525D8190768F37D6B205B589"
-	"DCD316BBE7D89A9DC21917F17799E698"
-	"531F5E6E3E10BD31370B259C3F81C3A3"
-	"733071300F0603551D130101FF040530"
-	"030101FF301D0603551D0E041604148E"
-	"5D90347858BAAAD870D8BDFBA6A85E7B"
-	"563B64301F0603551D23041830168014"
-	"8E5D90347858BAAAD870D8BDFBA6A85E"
-	"7B563B64300B0603551D0F0404030201"
-	"06301106096086480186F84201010404"
-	"03020057",
-};
 
-static char *dgsthex[] = {
-	"66c7f0f462eeedd9d1f2d46bdc10e4e24167c4875cf2f7a2297da02b8f4ba8e0",
-	"debe9ff92275b8a138604889c18e5a4d6fdb70e5387e5765293dcba39c0c5732",
-	"F4A38489E32B45B6F876E3AC2168CA392362DC8F23459C1D1146FC3DBFB7BC9A",
-	"26352AF82EC19F207BBC6F9474E11E90CE0F7DDACE03B27F801817E897A81FD5",
-	"E4D1D0C3CA4C7F11BC8FF8CB3F4C02A78F108FA098E51A668487240F75E20F31",
-	"6B4B6D0E276691BD4A11BF72F4FB501AE309FDACB72FA6CC336E6656119ABD67",
-	"329c2f6030cc7e0ca3af6c97b76243ca250338ad3d3dc3a8b322d1cfdf98c2b7",
-	/*"ECF0080215977B2E5D6D61B98A99442F03E8803DC39E349F8DCA5621A9ACDF2B",*/
-	"557BAD30E183559AEEC3B2256E1C7C11F870D22B165D015ACF9465B09B87B527",
-	"4D38D2958CA7FD2CFAE3AF04486959CF92C8EF48E8B83A05C112E739D5F181D0",
-	"C3B02E500A8B60B77DEDCF6F4C11BEF8D56E5CDE708C72065654FD7B2167915A",
-};
-
-int main(int argc, char **argv)
+static int test_sm3(void)
 {
+	const char *testhex[] = {
+		/* 0 "abc" */
+		"616263",
+		/* 1 "abcd" 16 times */
+		"6162636461626364616263646162636461626364616263646162636461626364"
+		"6162636461626364616263646162636461626364616263646162636461626364",
+		/* 2 p.57 ZA */
+		"0090"
+		"414C494345313233405941484F4F2E434F4D"
+		"787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498"
+		"63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A"
+		"421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D"
+		"0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2"
+		"0AE4C7798AA0F119471BEE11825BE46202BB79E2A5844495E97C04FF4DF2548A"
+		"7C0240F88F1CD4E16352A73C17B7F16F07353E53A176D684A9FE0C6BB798E857",
+		/* 3 p.59 ZA */
+		"0090"
+		"414C494345313233405941484F4F2E434F4D"
+		"000000000000000000000000000000000000000000000000000000000000000000"
+		"00E78BCD09746C202378A7E72B12BCE00266B9627ECB0B5A25367AD1AD4CC6242B"
+		"00CDB9CA7F1E6B0441F658343F4B10297C0EF9B6491082400A62E7A7485735FADD"
+		"013DE74DA65951C4D76DC89220D5F7777A611B1C38BAE260B175951DC8060C2B3E"
+		"0165961645281A8626607B917F657D7E9382F1EA5CD931F40F6627F357542653B2"
+		"01686522130D590FB8DE635D8FCA715CC6BF3D05BEF3F75DA5D543454448166612",
+		/* 4 p.72 ZA */
+		"0090"
+		"414C494345313233405941484F4F2E434F4D"
+		"787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498"
+		"63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A"
+		"421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D"
+		"0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2"
+		"3099093BF3C137D8FCBBCDF4A2AE50F3B0F216C3122D79425FE03A45DBFE1655"
+		"3DF79E8DAC1CF0ECBAA2F2B49D51A4B387F2EFAF482339086A27A8E05BAED98B",
+		/* 5 p.72 ZB */
+		"0088"
+		"42494C4C343536405941484F4F2E434F4D"
+		"787968B4FA32C3FD2417842E73BBFEFF2F3C848B6831D7E0EC65228B3937E498"
+		"63E4C6D3B23B0C849CF84241484BFE48F61D59A5B16BA06E6E12D1DA27C5249A"
+		"421DEBD61B62EAB6746434EBC3CC315E32220B3BADD50BDC4C4E6C147FEDD43D"
+		"0680512BCBB42C07D47349D2153B70C4E5D7FDFCBFA36EA1A85841B9E46E09A2"
+		"245493D446C38D8CC0F118374690E7DF633A8A4BFB3329B5ECE604B2B4F37F43"
+		"53C0869F4B9E17773DE68FEC45E14904E0DEA45BF6CECF9918C85EA047C60A4C",
+		/* 6 p.75 ZA */
+		"0090"
+		"414C494345313233405941484F4F2E434F4D"
+		"000000000000000000000000000000000000000000000000000000000000000000"
+		"00E78BCD09746C202378A7E72B12BCE00266B9627ECB0B5A25367AD1AD4CC6242B"
+		"00CDB9CA7F1E6B0441F658343F4B10297C0EF9B6491082400A62E7A7485735FADD"
+		"013DE74DA65951C4D76DC89220D5F7777A611B1C38BAE260B175951DC8060C2B3E"
+		"008E3BDB2E11F9193388F1F901CCC857BF49CFC065FB38B9069CAAE6D5AFC3592F"
+		"004555122AAC0075F42E0A8BBD2C0665C789120DF19D77B4E3EE4712F598040415",
+		/* 7 p.76 ZB */
+		"0088"
+		"42494C4C343536405941484F4F2E434F4D"
+		"000000000000000000000000000000000000000000000000000000000000000000"
+		"00E78BCD09746C202378A7E72B12BCE00266B9627ECB0B5A25367AD1AD4CC6242B"
+		"00CDB9CA7F1E6B0441F658343F4B10297C0EF9B6491082400A62E7A7485735FADD"
+		"013DE74DA65951C4D76DC89220D5F7777A611B1C38BAE260B175951DC8060C2B3E"
+		"0034297DD83AB14D5B393B6712F32B2F2E938D4690B095424B89DA880C52D4A7D9"
+		"0199BBF11AC95A0EA34BBD00CA50B93EC24ACB68335D20BA5DCFE3B33BDBD2B62D",
+		/* 8 TopsecCA cert ZA */
+		"0080"
+		"31323334353637383132333435363738"
+		"FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC"
+		"28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93"
+		"32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7"
+		"BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"
+		"D69C2F1EEC3BFB6B95B30C28085C77B125D77A9C39525D8190768F37D6B205B5"
+		"89DCD316BBE7D89A9DC21917F17799E698531F5E6E3E10BD31370B259C3F81C3",
+		/* 9 */
+		"4D38D2958CA7FD2CFAE3AF04486959CF92C8EF48E8B83A05C112E739D5F181D0"
+		"3082020CA003020102020900"
+		"AF28725D98D33143300C06082A811CCF"
+		"550183750500307D310B300906035504"
+		"060C02636E310B300906035504080C02"
+		"626A310B300906035504070C02626A31"
+		"0F300D060355040A0C06746F70736563"
+		"310F300D060355040B0C06746F707365"
+		"633111300F06035504030C08546F7073"
+		"65634341311F301D06092A864886F70D"
+		"0109010C10626A40746F707365632E63"
+		"6F6D2E636E301E170D31323036323430"
+		"37353433395A170D3332303632303037"
+		"353433395A307D310B30090603550406"
+		"0C02636E310B300906035504080C0262"
+		"6A310B300906035504070C02626A310F"
+		"300D060355040A0C06746F7073656331"
+		"0F300D060355040B0C06746F70736563"
+		"3111300F06035504030C08546F707365"
+		"634341311F301D06092A864886F70D01"
+		"09010C10626A40746F707365632E636F"
+		"6D2E636E3059301306072A8648CE3D02"
+		"0106082A811CCF5501822D03420004D6"
+		"9C2F1EEC3BFB6B95B30C28085C77B125"
+		"D77A9C39525D8190768F37D6B205B589"
+		"DCD316BBE7D89A9DC21917F17799E698"
+		"531F5E6E3E10BD31370B259C3F81C3A3"
+		"733071300F0603551D130101FF040530"
+		"030101FF301D0603551D0E041604148E"
+		"5D90347858BAAAD870D8BDFBA6A85E7B"
+		"563B64301F0603551D23041830168014"
+		"8E5D90347858BAAAD870D8BDFBA6A85E"
+		"7B563B64300B0603551D0F0404030201"
+		"06301106096086480186F84201010404"
+		"03020057",
+	};
+
+	const char *dgsthex[] = {
+		"66c7f0f462eeedd9d1f2d46bdc10e4e24167c4875cf2f7a2297da02b8f4ba8e0",
+		"debe9ff92275b8a138604889c18e5a4d6fdb70e5387e5765293dcba39c0c5732",
+		"F4A38489E32B45B6F876E3AC2168CA392362DC8F23459C1D1146FC3DBFB7BC9A",
+		"26352AF82EC19F207BBC6F9474E11E90CE0F7DDACE03B27F801817E897A81FD5",
+		"E4D1D0C3CA4C7F11BC8FF8CB3F4C02A78F108FA098E51A668487240F75E20F31",
+		"6B4B6D0E276691BD4A11BF72F4FB501AE309FDACB72FA6CC336E6656119ABD67",
+		"329c2f6030cc7e0ca3af6c97b76243ca250338ad3d3dc3a8b322d1cfdf98c2b7",
+		/*"ECF0080215977B2E5D6D61B98A99442F03E8803DC39E349F8DCA5621A9ACDF2B",*/
+		"557BAD30E183559AEEC3B2256E1C7C11F870D22B165D015ACF9465B09B87B527",
+		"4D38D2958CA7FD2CFAE3AF04486959CF92C8EF48E8B83A05C112E739D5F181D0",
+		"C3B02E500A8B60B77DEDCF6F4C11BEF8D56E5CDE708C72065654FD7B2167915A",
+	};
+
 	int err = 0;
 	char *p;
 	uint8_t testbuf[sizeof(testhex)/2 + 1000];
@@ -193,18 +195,29 @@ int main(int argc, char **argv)
 
 		if (memcmp(dgstbuf, dgst, sizeof(dgst)) != 0) {
 			int n;
-			printf("error calculating SM3 on %s\n", testhex[i]);
-			printf(" digest(corret) = ");
+			fprintf(stderr, "sm3 test %lu failed\n", i+1);
+			fprintf(stderr, "error calculating SM3 on %s\n", testhex[i]);
+			fprintf(stderr, " digest(corret) = ");
 			for (n = 0; n < sizeof(dgst); n++) {
-				printf("%02X", dgst[n]);
+				fprintf(stderr, "%02X", dgst[n]);
 			}
-			printf("\n");
-			printf(" digest(error)  = %s\n", dgsthex[i]);
-			err++;
-		} else {
-			printf("sm3 test %lu ok\n", i+1);
+			fprintf(stderr, "\n");
+			fprintf(stderr, " digest(error)  = %s\n", dgsthex[i]);
+			return -1;
 		}
 	}
 
-	return err;
+	printf("%s() ok\n", __FUNCTION__);
+	return 1;
+}
+
+
+int main(void)
+{
+	if (test_sm3() != 1) goto err;
+	printf("%s all tests passed\n", __FILE__);
+	return 0;
+err:
+	error_print();
+	return 1;
 }