diff --git a/src/sm4_cbc.c b/src/sm4_cbc.c
index 2349153c..3a833f7a 100644
--- a/src/sm4_cbc.c
+++ b/src/sm4_cbc.c
@@ -117,7 +117,6 @@ int sm4_cbc_encrypt_update(SM4_CBC_CTX *ctx,
 		}
 		memcpy(ctx->block + ctx->block_nbytes, in, left);
 		sm4_cbc_encrypt_blocks(&ctx->sm4_key, ctx->iv, ctx->block, 1, out);
-		//memcpy(ctx->iv, out, SM4_BLOCK_SIZE);
 		in += left;
 		inlen -= left;
 		out += SM4_BLOCK_SIZE;
@@ -127,10 +126,8 @@ int sm4_cbc_encrypt_update(SM4_CBC_CTX *ctx,
 		nblocks = inlen / SM4_BLOCK_SIZE;
 		len = nblocks * SM4_BLOCK_SIZE;
 		sm4_cbc_encrypt_blocks(&ctx->sm4_key, ctx->iv, in, nblocks, out);
-		//memcpy(ctx->iv, out + len - SM4_BLOCK_SIZE, SM4_BLOCK_SIZE);
 		in += len;
 		inlen -= len;
-		out += len;
 		*outlen += len;
 	}
 	if (inlen) {
@@ -214,7 +211,6 @@ int sm4_cbc_decrypt_update(SM4_CBC_CTX *ctx,
 		sm4_cbc_decrypt_blocks(&ctx->sm4_key, ctx->iv, in, nblocks, out);
 		in += len;
 		inlen -= len;
-		out += len;
 		*outlen += len;
 	}
 	memcpy(ctx->block, in, inlen);
diff --git a/src/sm4_ctr.c b/src/sm4_ctr.c
index d4a312a1..e0a0f9fa 100644
--- a/src/sm4_ctr.c
+++ b/src/sm4_ctr.c
@@ -103,7 +103,6 @@ int sm4_ctr_encrypt_update(SM4_CTR_CTX *ctx,
 		sm4_ctr_encrypt_blocks(&ctx->sm4_key, ctx->ctr, in, nblocks, out);
 		in += len;
 		inlen -= len;
-		out += len;
 		*outlen += len;
 	}
 	if (inlen) {
@@ -187,7 +186,6 @@ int sm4_ctr32_encrypt_update(SM4_CTR_CTX *ctx,
 		sm4_ctr32_encrypt_blocks(&ctx->sm4_key, ctx->ctr, in, nblocks, out);
 		in += len;
 		inlen -= len;
-		out += len;
 		*outlen += len;
 	}
 	if (inlen) {
diff --git a/tests/sm4_gcmtest.c b/tests/sm4_gcmtest.c
index ffba235b..b55ad54a 100644
--- a/tests/sm4_gcmtest.c
+++ b/tests/sm4_gcmtest.c
@@ -342,13 +342,12 @@ static int speed_sm4_gcm_encrypt(void)
 	return 1;
 }
 
-
 int main(void)
 {
-//	if (test_sm4_gcm() != 1) goto err;
-//	if (test_sm4_gcm_gbt36624_1() != 1) goto err;
+	if (test_sm4_gcm() != 1) goto err;
+	if (test_sm4_gcm_gbt36624_1() != 1) goto err;
 	if (test_sm4_gcm_gbt36624_2() != 1) goto err;
-//	if (test_sm4_gcm_ctx() != 1) goto err;
+	if (test_sm4_gcm_ctx() != 1) goto err;
 #if ENABLE_TEST_SPEED
 	if (speed_sm4_gcm_encrypt() != 1) goto err;
 #endif