Hash algorithms are the heart of the cryptography and security. SHA-256 is a Secure Hash Algorithm which will generate an output hash value in 256 bit. SHA-256 is designed by the National Security Agency (NSA). SHA-256 is one of the cryptographic hash functions. SHA-256 is also named one-way function where the generated hash value cannot be reversed theoretically. This makes SHA-256 very useful for password validation, challenge hash authentication, anti-tamper, digital signatures, X.509, SSL/TLS certificates etc.
As SHA-256 is a cryptographic function it provides some features for cryptographic and security operations.
- SHA-256 generated or calculated data will be
One-Way. This means it can not be reversed back to the original data with a function. There is an exception where brute-force or rainbow tables can be used.
- SHA-256 is a member of the SHA-2 cryptographic hash functions family which is created by NSA.
- SHA-256 is an anti-tamper feature which means calculating the hash of the same data at different times will provide the same hash value. If there is a single bit change in the data the hash value will be very different. So we can decide the tamper with this feature.
- SHA-256 can be used in
challenge handshake authenticationbecause the password is not transmitted in clear text.
- SHA-256 can be used in
digital signaturesin order to check the given data validity and integrity with authenticity.
Generate SHA-256 For Given Text In Python
In Python programming language SHA-256 is provided by the
hashlib module. We will use
sha256() function. In order to provide a string to calculate the hash, we should encode the string with the
encode() function like below. We will print the calculated hash value in hexadecimal format with the
We can see that we have calculated two data hash values. These data is very similar where the first one is
mysecretpassword and the second one is
mysecretpasswrt where only the last letter is different. This changes the calculated hash value completely.
Generate SHA-256 For Given Text In Go
Go is a new generation programming language where SHA-256 is supported. We can use the
Sum256() function by providing the data.
s := "mysecretpassword"
sha256 := sha256.Sum256(byte(s))
Generate SHA-256 For Given Text In PHP
PHP is a web and server-side scripting and programming language. We can use
hash() function by providing the data we can to calculate its hash. We will also provide the hash algorithm we want to use which is
sha256 in this case.
Generate SHA-256 For Given Text In PowerShell
PowerShell provides HashAlgorithms library in order to implement SHA256. We will use
Create() function and provide the hash algorithm name which is
$StringBuilder = New-Object System.Text.StringBuilder
Generate SHA-256 For Given Text In Java
Java programming language provides the SHA-256 for a long time. We will use
MessageDigest library in order to create an SHA-256 hash object. Then we will use
digest() function in order to calculate the hash of the given text. Calculated hash value will be stored into the byte array named
MessageDigest digest = MessageDigest.getInstance("SHA-256");
byte encodedhash = digest.digest("mysecretpassword".getBytes(StandardCharsets.UTF_8));