I need to get the sha256 hash of a chunk of a binary file.I wrote a little shell script for that task:
dd if=$1 skip=$2 count=$3 bs=1 | sha256sum
When I test it, I get the following result:
bernardo@bernardo-ThinkCentre-Edge72:~$ ./test.sh test.bin 10 2020+0 records in20+0 records out20 bytes (20 B) copied, 0,000100981 s, 198 kB/s7d9330a7c51eabe36a81a6cff308ac4d2035e63d7a356fc112f4fcd16208f43d -
Does that mean the hash is based solely on the chunk output by dd, or did it also use dd's feedback "20+0 records in..."?
I'm writing a register form for a application but still having problems with being new to c#.
I am looking to encrypt/hash passwords to md5 or sha-256, preferably sha-256.
Any good examples? I want it to be able to take the information from "string password;" and then hash it and store in the variable "string hPassword;". Any ideas?
This question already has an answer here:
I am trying to convert and hash function in java below to c# equivalent
String mt ="411111111990"; String hash_data="testclient111111222222016-12-26 12:37"; MessageDigest algorithm = MessageDigest.getInstance("SHA-256"); //get the instance of sha256 algorithm.reset(); byte key=meterno.getBytes(); //converts the meter number into bytes and read into a byte array algorithm.update(key); byte messageDigest = algorithm.digest(hash_data.getBytes("UTF-8")); //convert messageDigest into individual hex nibble.. that is your hash
The Security services API doesn't appear to allow me to compute a hash directly. There are plenty of public domain and liberally licensed versions available, but I'd rather use a system library implementation if possible.
The data is accessible via NSData, or plain pointers.
The cryptographic strength of the hash is important to me. SHA-256 is the minimum acceptable hash size.
In this question it turned out, that I cannot use the
sha256 mechanism in the
FROM line in a
Dockerfile to verify I am using the correct locally built non-DockerHub image in another derived image.
Is there another way to verify locally built Docker images? Some best practice maybe?