Linux HMACSHA256
时间: 2023-11-07 15:01:09 浏览: 34
HMACSHA256 is a cryptographic hash function that is commonly used in Linux for secure authentication and message integrity checks. It is a type of message authentication code (MAC) that uses a secret key to ensure the integrity and authenticity of a message.
To use HMACSHA256 in Linux, you can use the OpenSSL library, which provides a command-line utility called openssl dgst. Here's an example of how to use HMACSHA256 to compute a message digest:
```
$ echo "hello world" | openssl dgst -sha256 -hmac "secretkey"
```
This command computes the HMACSHA256 hash of the message "hello world" using the secret key "secretkey". The output will be a hexadecimal string representing the hash value.
In addition to the command-line utility, you can also use the OpenSSL library in your own programs to perform HMACSHA256 computations. The library provides functions such as HMAC() and HMAC_Init() that you can use to compute HMACSHA256 hashes.
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