What are the commonly used encryption methods in php?

PHP commonly used encryption methods are: 1. Use the md5() function; 2. Use the crypt() function; 3. Use the sha1() function; 4. Use the urlencode() function; 5. Use base64_encode( ) function; 6. Use the password_hash() function.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Commonly used PHP encryption method

1. MD5 encryption

string md5 ( string $str [, bool $raw_output = false ] )

Parameters

• str -- Original string.

• raw_output -- If the optional raw_output is set to TRUE, the MD5 message digest will be returned in raw binary format with a length of 16 bytes.

2. Crype Encryption

crypt() Returns a Cryptocryption algorithm based on the standard UNIX DES algorithm or other alternative algorithms available on the system. Hash string.

string crypt ( string $str [, string $salt ] )

Parameters

• str -- The string to be hashed.

• salt -- Optional salt value string. If not provided, algorithm behavior will be determined by different algorithm implementations and may lead to unpredictable endings.

This is also an irreversible encryption

3. Sha1 encryption

string sha1 ( string $str [, bool $raw_output = false ] )

Parameters

• str -- Input string.

• raw_output -- If the optional raw_output parameter is set to TRUE, the sha1 digest will be returned in raw format with a length of 20 characters, otherwise the return value will be a 40-character length sixteen Base numbers.

This is also an irreversible encryption

4. URL encryption

string urlencode ( string $str )

This function facilitates encoding and Use this for the request part of the URL, and it also makes it easy to pass variables to the next page.

Returns a string. All non-alphanumeric characters in this string except -_. will be replaced with a percent sign (%) followed by two hexadecimal digits. Spaces are encoded as plus( ). This encoding is the same as the encoding of WWW form POST data, and the same encoding as the application/x-www-form-urlencoded media type. For historical reasons, this encoding differs from the RFC1738 encoding in encoding spaces as plus signs ( ).

string urldecode ( string $str )

Decode any %## in the given encoded string. The plus sign (' ') is decoded into a space character.

This is a reversible encryption, the urlencode method is used for encryption, and the urldecode method is used for decryption

5. Base64 information encoding encryption

string base64_encode ( string $data )

Use base64 to encode data.

This encoding is designed to enable binary data to be transmitted over non-pure 8-bit transport layers, such as the body of an email.

Base64-encoded data takes up about 33% more space than the original data.

string base64_decode ( string $data [, bool $strict = false ] )

Decode base64 encoded data.

Parameters

• #data -- Encoded data.

• strict -- Returns FALSE if the input data exceeds the base64 alphabet.

6.phpass (recommended)

Tested with phpass 0.3, the standard way to protect user passwords by hashing them before storing them in the database. Many commonly used hashing algorithms such as md5 and even sha1 are not secure for password storage because hackers can easily crack passwords using those algorithms.

The most secure way to hash passwords is to use the bcrypt algorithm. The open source phpass library provides this function in an easy-to-use class

7. Personally think a better password encryption method

PHP5.5 introduces the Password Hashing function , the kernel comes with no need to install extensions. It is possible to test it under PHP5.4. It is best to confirm whether your current environment supports these functions before using it.

Password Hashing mainly provides 4 functions

//1.查看哈希值的相关信息
array password_get_info (string $hash)
 
//2.创建hash密码
string password_hash(string $password , integer $algo [, array $options ])

//3.判断hash密码是否特定选项、算法所创建
boolean password_needs_rehash (string $hash , integer $algo [, array $options ] 

//4.验证密码
boolean password_verify (string $password , string $hash)

The following examples:

$password = 'password123456';//原始密码
$hash_password = password_hash($password, PASSWORD_BCRYPT);//使用BCRYPT算法加密密码
if (password_verify($password , $hash_password)){
   echo "密码匹配";
}else{  
   echo "密码错误";
}

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