diff --git a/include/gmssl/pbkdf2.h b/include/gmssl/pbkdf2.h
index 06233b27..2b26b086 100644
--- a/include/gmssl/pbkdf2.h
+++ b/include/gmssl/pbkdf2.h
@@ -29,11 +29,7 @@ extern "C" {
 #define PBKDF2_DEFAULT_SALT_SIZE	8
 
 
-int pbkdf2_genkey(const DIGEST *digest,
-	const char *pass, size_t passlen, const uint8_t *salt, size_t saltlen, size_t iter,
-	size_t outlen, uint8_t *out);
-
-int pbkdf2_hmac_sm3_genkey(
+int pbkdf2_hmac_genkey(const DIGEST *digest,
 	const char *pass, size_t passlen, const uint8_t *salt, size_t saltlen, size_t iter,
 	size_t outlen, uint8_t *out);
 
diff --git a/src/pbkdf2.c b/src/pbkdf2.c
new file mode 100644
index 00000000..6f75a0f1
--- /dev/null
+++ b/src/pbkdf2.c
@@ -0,0 +1,112 @@
+/*
+ *  Copyright 2014-2026 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 <stdint.h>
+#include <string.h>
+#include <gmssl/pbkdf2.h>
+#include <gmssl/error.h>
+#include <gmssl/endian.h>
+#include <gmssl/mem.h>
+
+
+int pbkdf2_hmac_genkey(const DIGEST *digest,
+	const char *pass, size_t passlen, const uint8_t *salt, size_t saltlen,
+	size_t iter, size_t outlen, uint8_t *out)
+{
+	int ret = -1;
+	HMAC_CTX ctx;
+	HMAC_CTX ctx_tmpl;
+	uint8_t iter_be[4];
+	uint8_t tmp_block[DIGEST_MAX_SIZE];
+	uint8_t key_block[DIGEST_MAX_SIZE];
+	uint32_t block_index = 1;
+	size_t digest_size;
+	size_t block_count;
+
+	if (!digest || !iter || !outlen || !out) {
+		error_print();
+		return -1;
+	}
+	if (digest->digest_size > HMAC_MAX_SIZE
+		|| !digest->digest_size) {
+		error_print();
+		return -1;
+	}
+	if (!pass && passlen) {
+		error_print();
+		return -1;
+	}
+	if (!salt && saltlen) {
+		error_print();
+		return -1;
+	}
+
+	digest_size = digest->digest_size;
+
+	block_count = outlen / digest_size;
+	if (outlen % digest_size) {
+		block_count++;
+	}
+	if (block_count > UINT32_MAX) {
+		error_print();
+		return -1;
+	}
+
+	if (hmac_init(&ctx_tmpl, digest, (const uint8_t *)pass, passlen) != 1) {
+		error_print();
+		return -1;
+	}
+
+	while (outlen) {
+		size_t maclen;
+		size_t i;
+
+		PUTU32(iter_be, block_index);
+		block_index++;
+
+		ctx = ctx_tmpl;
+		if (hmac_update(&ctx, salt, saltlen) < 0
+			|| hmac_update(&ctx, iter_be, sizeof(iter_be)) != 1
+			|| hmac_finish(&ctx, tmp_block, &maclen) != 1) {
+			error_print();
+			goto end;
+		}
+		memcpy(key_block, tmp_block, digest_size);
+
+		for (i = 1; i < iter; i++) {
+			ctx = ctx_tmpl;
+			if (hmac_update(&ctx, tmp_block, digest_size) != 1
+				|| hmac_finish(&ctx, tmp_block, &maclen) != 1) {
+				error_print();
+				goto end;
+			}
+			memxor(key_block, tmp_block, digest_size);
+		}
+
+		if (outlen < digest_size) {
+			memcpy(out, key_block, outlen);
+			out += outlen;
+			outlen = 0;
+		} else {
+			memcpy(out, key_block, digest_size);
+			out += digest_size;
+			outlen -= digest_size;
+		}
+	}
+
+	ret = 1;
+
+end:
+	gmssl_secure_clear(&ctx, sizeof(ctx));
+	gmssl_secure_clear(&ctx_tmpl, sizeof(ctx_tmpl));
+	gmssl_secure_clear(key_block, sizeof(key_block));
+	gmssl_secure_clear(tmp_block, sizeof(tmp_block));
+	return ret;
+}
diff --git a/tests/pbkdf2test.c b/tests/pbkdf2test.c
index e2c0f2a0..90778a91 100644
--- a/tests/pbkdf2test.c
+++ b/tests/pbkdf2test.c
@@ -111,7 +111,7 @@ static int test_pbkdf2_genkey(void)
 	for (i = 0; i < sizeof(pbkdf2_hmac_sha1_tests)/sizeof(pbkdf2_hmac_sha1_tests[0]); i++) {
 		hex_to_bytes(pbkdf2_hmac_sha1_tests[i].dk, strlen(pbkdf2_hmac_sha1_tests[i].dk), buf, &len);
 
-		if (pbkdf2_genkey(DIGEST_sha1(),
+		if (pbkdf2_hmac_genkey(DIGEST_sha1(),
 			pbkdf2_hmac_sha1_tests[i].pass, strlen(pbkdf2_hmac_sha1_tests[i].pass),
 			(uint8_t *)pbkdf2_hmac_sha1_tests[i].salt, strlen(pbkdf2_hmac_sha1_tests[i].salt),
 			pbkdf2_hmac_sha1_tests[i].iter, pbkdf2_hmac_sha1_tests[i].dklen, key) != 1) {