Conv from UTF-8 to ASCII

`file *.c` to see file types (ASCII or UTF-8), convert UTF-8 (with BOM) to ASCII

```sh
sed '1s/^\xEF\xBB\xBF//'  sm4.c | iconv -f UTF-8 -t ASCII//TRANSLIT > temp.c
mv temp.c sm4.c
```

include/gmssl/endian.h

@@ -35,7 +35,7 @@
 	 (uint64_t)(p)[7])
 
 
-// 注意：PUTU32(buf, val++) 会出错！
+// WARNING: must not write PUTU32(buf, val++)
 #define PUTU16(p,V) \
 	((p)[0] = (uint8_t)((V) >> 8), \
 	 (p)[1] = (uint8_t)(V))

include/gmssl/file.h

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

include/gmssl/oid.h

@@ -147,7 +147,7 @@ enum {
 	OID_aes192_cbc,
 	OID_aes256_cbc,
 
-	OID_aes128, // 没有OID
+	OID_aes128, // No OID
 
 	OID_ecdsa_with_sha1,
 	OID_ecdsa_with_sha224,

include/gmssl/pkcs8.h

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may
@@ -34,7 +34,7 @@ PBKDF2-params ::= SEQUENCE {
 		otherSource	AlgorithmIdentifier {{PBKDF2-SaltSources}}
 	},
 	iterationCount		INTEGER (1..MAX),
-	keyLength		INTEGER (1..MAX) OPTIONAL, -- 这个参数可以由函数指定
+	keyLength		INTEGER (1..MAX) OPTIONAL,
 	prf			AlgorithmIdentifier {{PBKDF2-PRFs}} DEFAULT algid-hmacWithSHA1
 }
 

include/gmssl/sm2.h

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2024 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may
@@ -45,7 +45,7 @@ from RFC 5915
 
 ECPrivateKey ::= SEQUENCE {
 	version		INTEGER,	-- value MUST be (1)
-	privateKey	OCTET STRING,	-- big endian encoding of integer 这里不是以INTEGER编码的，因此长度固定
+	privateKey	OCTET STRING,	-- big endian encoding of integer, fixed length
 	parameters	[0] EXPLICIT ECParameters OPTIONAL,
 					-- ONLY namedCurve OID is permitted, by RFC 5480
 					-- MUST always include this field, by RFC 5915

include/gmssl/sm2_key_share.h

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

include/gmssl/sm2_recover.h

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

include/gmssl/sm2_ring.h

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

include/gmssl/tls.h

@@ -75,7 +75,7 @@ typedef enum {
 	TLS_cipher_sm4_ccm_sm3			= 0x00c7,
 
 	// TLCP, GB/T 38636-2020, GM/T 0024-2012
-	TLS_cipher_ecdhe_sm4_cbc_sm3		= 0xe011, // 可以让TLSv1.2使用这个
+	TLS_cipher_ecdhe_sm4_cbc_sm3		= 0xe011, // TODO: let TLSv1.2 use this as default cipher suite
 	TLS_cipher_ecdhe_sm4_gcm_sm3		= 0xe051,
 	TLS_cipher_ecc_sm4_cbc_sm3		= 0xe013,
 	TLS_cipher_ecc_sm4_gcm_sm3		= 0xe053,
@@ -253,8 +253,6 @@ typedef enum {
 const char *tls_curve_type_name(int type);
 
 
-// 与其支持v2，还不如直接修改v2，让v2和v3兼容
-
 typedef enum {
 	TLS_curve_secp256k1			= 22,
 	TLS_curve_secp256r1			= 23,

include/gmssl/x509.h

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

include/gmssl/x509_cer.h

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

src/file.c

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

src/http.c

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

src/sm2_key.c

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2024 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

src/sm2_z256.c

@@ -386,8 +386,7 @@ int sm2_z256_print(FILE *fp, int ind, int fmt, const char *label, const sm2_z256
 const uint64_t SM2_Z256_P[4] = {
 	0xffffffffffffffff, 0xffffffff00000000, 0xffffffffffffffff, 0xfffffffeffffffff,
 };
-// 注意这里 SM2_Z256_P[0] 和 SM2_Z256_P[2] 是特殊值，在汇编中可以根据这个特殊值做特定的实现
+// TODO: SM2_Z256_P[0] and SM2_Z256_P[2] are special values (fff...f), use this to optimize the ASM code	
-
 
 
 const uint64_t *sm2_z256_prime(void) {
@@ -969,7 +968,7 @@ void sm2_z256_modn_exp(sm2_z256_t r, const sm2_z256_t a, const sm2_z256_t e)
 const uint64_t SM2_Z256_N_MINUS_TWO[4] = {
 	0x53bbf40939d54121, 0x7203df6b21c6052b, 0xffffffffffffffff, 0xfffffffeffffffff,
 };
-// exp都是从高位开始的，如果都是1的话，那么就是都要平方和乘
+// TODO: use the special form of SM2_Z256_N_MINUS_TWO[2, 3]		
 
 void sm2_z256_modn_mont_inv(sm2_z256_t r, const sm2_z256_t a)
 {
@@ -1266,7 +1265,7 @@ void sm2_z256_point_add(SM2_Z256_POINT *r, const SM2_Z256_POINT *a, const SM2_Z2
 	in1infty = is_zero(in1infty);
 	in2infty = is_zero(in2infty);
 
-	// 这里很明显有极好的并行性
+	// TODO: can we parallel on the following code?		
 	sm2_z256_modp_mont_sqr(Z2sqr, in2_z);        /* Z2^2 */
 	sm2_z256_modp_mont_sqr(Z1sqr, in1_z);        /* Z1^2 */
 

src/sm4_ce.c

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2024 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

src/sm9_key.c

@@ -389,7 +389,7 @@ int sm9_sign_master_key_extract_key(SM9_SIGN_MASTER_KEY *msk, const char *id, si
 	sm9_z256_hash1(t, id, idlen, SM9_HID_SIGN);
 	sm9_z256_modn_add(t, t, msk->ks);
 	if (sm9_z256_is_zero(t)) {
-		// 这是一个严重问题，意味着整个msk都需要作废了
+		// TODO: when this happen, the admin should re-generate the MSK. Some speciall error/warning should return on this!			
 		error_print();
 		return -1;
 	}
@@ -494,7 +494,7 @@ int sm9_oid_to_der(int oid, uint8_t **out, size_t *outlen)
 {
 	const ASN1_OID_INFO *info;
 	if (oid == -1) {
-		// TODO: 检查其他的oid_to_der是否支持这个default == -1 的特性
+		// FIXME: check if other oid_to_der support this default == -1 behavior				
 		return 0;
 	}
 	if (!(info = asn1_oid_info_from_oid(sm9_oids, sm9_oids_count, oid))) {
@@ -686,7 +686,7 @@ static int sm9_private_key_info_decrypt_from_der(int *alg, int *params, uint8_t
 	sm4_set_decrypt_key(&sm4_key, key);
 	if (sm4_cbc_padding_decrypt(&sm4_key, iv, enced_pkey_info, enced_pkey_info_len,
 			pkey_info, &pkey_info_len) != 1
-		|| sm9_private_key_info_from_der(alg, params, &cp_prikey, prikey_len, // 注意这里的是const uint8_t *，必须拷贝到外面
+		|| sm9_private_key_info_from_der(alg, params, &cp_prikey, prikey_len, // the const uint8_t *, must be copy outside			
 			&cp, &pkey_info_len) != 1
 		|| asn1_length_is_zero(pkey_info_len) != 1) {
 		error_print();

src/socket.c

@@ -1,4 +1,4 @@
-/*
+/*
  *  Copyright 2014-2023 The GmSSL Project. All Rights Reserved.
  *
  *  Licensed under the Apache License, Version 2.0 (the License); you may

src/x509_crl.c

@@ -802,14 +802,14 @@ int x509_issuing_distribution_point_to_der(
 	if (x509_uri_as_explicit_distribution_point_name_to_der(0, dist_point_uri, dist_point_uri_len, NULL, &len) < 0
 		|| asn1_implicit_boolean_to_der(1, only_contains_user_certs, NULL, &len) < 0
 		|| asn1_implicit_boolean_to_der(2, only_contains_ca_certs, NULL, &len) < 0
-		|| asn1_implicit_bits_to_der(3, only_some_reasons, NULL, &len) < 0 // TODO: 特化的类型
+		|| asn1_implicit_bits_to_der(3, only_some_reasons, NULL, &len) < 0 // TODO: create a new type, instead of use bits		
 		|| asn1_implicit_boolean_to_der(4, indirect_crl, NULL, &len) < 0
 		|| asn1_implicit_boolean_to_der(5, only_contains_attr_certs, NULL, &len) < 0
 		|| asn1_sequence_header_to_der(len, out, outlen) != 1
 		|| x509_uri_as_explicit_distribution_point_name_to_der(0, dist_point_uri, dist_point_uri_len, out, outlen) < 0
 		|| asn1_implicit_boolean_to_der(1, only_contains_user_certs, out, outlen) < 0
 		|| asn1_implicit_boolean_to_der(2, only_contains_ca_certs, out, outlen) < 0
-		|| asn1_implicit_bits_to_der(3, only_some_reasons, out, outlen) < 0 // TODO: 特化的类型
+		|| asn1_implicit_bits_to_der(3, only_some_reasons, out, outlen) < 0 // TODO: create a new type, instead of use bits              
 		|| asn1_implicit_boolean_to_der(4, indirect_crl, out, outlen) < 0
 		|| asn1_implicit_boolean_to_der(5, only_contains_attr_certs, out, outlen) < 0) {
 		error_print();