diff --git a/src/md5.c b/src/md5.c
index d7a25d24..f7b3a025 100644
--- a/src/md5.c
+++ b/src/md5.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *  Copyright 2014-2023 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.
@@ -168,7 +168,6 @@ void md5_finish(MD5_CTX *ctx, unsigned char *dgst)
 		PUTU32_LE(dgst, ctx->state[i]);
 		dgst += sizeof(uint32_t);
 	}
-	memset(ctx, 0, sizeof(*ctx));
 }
 
 void md5_digest(const unsigned char *data, size_t datalen,
@@ -178,4 +177,5 @@ void md5_digest(const unsigned char *data, size_t datalen,
 	md5_init(&ctx);
 	md5_update(&ctx, data, datalen);
 	md5_finish(&ctx, dgst);
+	memset(&ctx, 0, sizeof(ctx));
 }
diff --git a/src/sha1.c b/src/sha1.c
index 909e83b6..7154f0be 100644
--- a/src/sha1.c
+++ b/src/sha1.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *  Copyright 2014-2023 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.
@@ -158,7 +158,6 @@ void sha1_finish(SHA1_CTX *ctx, unsigned char *dgst)
 	for (i = 0; i < 5; i++) {
 		PUTU32(dgst + i*4, ctx->state[i]);
 	}
-	memset(ctx, 0, sizeof(*ctx));
 }
 
 void sha1_digest(const unsigned char *data, size_t datalen,
diff --git a/src/sha256.c b/src/sha256.c
index 96f2dc18..fa8f3bda 100644
--- a/src/sha256.c
+++ b/src/sha256.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *  Copyright 2014-2023 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.
@@ -167,7 +167,6 @@ void sha256_finish(SHA256_CTX *ctx, unsigned char dgst[SHA256_DIGEST_SIZE])
 		PUTU32(dgst, ctx->state[i]);
 		dgst += sizeof(uint32_t);
 	}
-	memset(ctx, 0, sizeof(*ctx));
 }
 
 void sha256_digest(const unsigned char *data, size_t datalen,
@@ -177,6 +176,7 @@ void sha256_digest(const unsigned char *data, size_t datalen,
 	sha256_init(&ctx);
 	sha256_update(&ctx, data, datalen);
 	sha256_finish(&ctx, dgst);
+	memset(&ctx, 0, sizeof(ctx));
 }
 
 
@@ -213,4 +213,5 @@ void sha224_digest(const unsigned char *data, size_t datalen,
 	sha224_init(&ctx);
 	sha224_update(&ctx, data, datalen);
 	sha224_finish(&ctx, dgst);
+	memset(&ctx, 0, sizeof(ctx));
 }
diff --git a/src/sha512.c b/src/sha512.c
index 6bed48e7..8f38f4bf 100644
--- a/src/sha512.c
+++ b/src/sha512.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *  Copyright 2014-2023 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.
@@ -85,7 +85,6 @@ void sha512_finish(SHA512_CTX *ctx, unsigned char dgst[SHA512_DIGEST_SIZE])
 		PUTU64(dgst, ctx->state[i]);
 		dgst += sizeof(uint64_t);
 	}
-	memset(ctx, 0, sizeof(SHA512_CTX));
 }
 
 #define Ch(X, Y, Z)	(((X) & (Y)) ^ ((~(X)) & (Z)))
@@ -188,6 +187,7 @@ void sha512_digest(const unsigned char *data, size_t datalen,
 	sha512_init(&ctx);
 	sha512_update(&ctx, data, datalen);
 	sha512_finish(&ctx, dgst);
+	memset(&ctx, 0, sizeof(ctx));
 }
 
 
@@ -229,5 +229,6 @@ void sha384_digest(const unsigned char *data, size_t datalen,
 	sha384_init(&ctx);
 	sha384_update(&ctx, data, datalen);
 	sha384_finish(&ctx, dgst);
+	memset(&ctx, 0, sizeof(ctx));
 }
 
diff --git a/src/sm3.c b/src/sm3.c
index 196a88f8..a82f9015 100644
--- a/src/sm3.c
+++ b/src/sm3.c
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
+ *  Copyright 2014-2023 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.
@@ -364,7 +364,6 @@ void sm3_finish(SM3_CTX *ctx, uint8_t *digest)
 	for (i = 0; i < 8; i++) {
 		PUTU32(digest + i*4, ctx->digest[i]);
 	}
-	memset(ctx, 0, sizeof(SM3_CTX));
 }
 
 void sm3_digest(const uint8_t *msg, size_t msglen,
@@ -374,4 +373,5 @@ void sm3_digest(const uint8_t *msg, size_t msglen,
 	sm3_init(&ctx);
 	sm3_update(&ctx, msg, msglen);
 	sm3_finish(&ctx, dgst);
+	memset(&ctx, 0, sizeof(ctx));
 }