crypto

Description:

crypto

A set of cryptographic hashing functions for Dart.
The following hashing algorithms are supported:

SHA-1
SHA-224
SHA-256
SHA-384
SHA-512
SHA-512/224
SHA-512/256
MD5
HMAC (i.e. HMAC-MD5, HMAC-SHA1, HMAC-SHA256)

Usage #
Digest on a single input #
To hash a list of bytes, invoke the convert method on the
sha1, sha256 or md5
objects.
import 'package:crypto/crypto.dart';
import 'dart:convert'; // for the utf8.encode method

void main() {
var bytes = utf8.encode("foobar"); // data being hashed

var digest = sha1.convert(bytes);

print("Digest as bytes: ${digest.bytes}");
print("Digest as hex string: $digest");
}
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Digest on chunked input #
If the input data is not available as a single list of bytes, use
the chunked conversion approach.
Invoke the startChunkedConversion method
to create a sink for the input data. On the sink, invoke the add
method for each chunk of input data, and invoke the close method
when all the chunks have been added. The digest can then be retrieved
from the Sink<Digest> used to create the input data sink.
import 'dart:convert';

import 'package:convert/convert.dart';
import 'package:crypto/crypto.dart';

void main() {
var firstChunk = utf8.encode("foo");
var secondChunk = utf8.encode("bar");

var output = AccumulatorSink<Digest>();
var input = sha1.startChunkedConversion(output);
input.add(firstChunk);
input.add(secondChunk); // call `add` for every chunk of input data
input.close();
var digest = output.events.single;

print("Digest as bytes: ${digest.bytes}");
print("Digest as hex string: $digest");
}
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The above example uses the AccumulatorSink class that comes with the
convert package. It is capable of accumulating multiple events, but
in this usage only a single Digest is added to it when the data sink's
close method is invoked.
HMAC #
Create an instance of the Hmac class with the hash function
and secret key being used. The object can then be used like the other
hash calculating objects.
import 'dart:convert';
import 'package:crypto/crypto.dart';

void main() {
var key = utf8.encode('p@ssw0rd');
var bytes = utf8.encode("foobar");

var hmacSha256 = Hmac(sha256, key); // HMAC-SHA256
var digest = hmacSha256.convert(bytes);

print("HMAC digest as bytes: ${digest.bytes}");
print("HMAC digest as hex string: $digest");
}
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Disclaimer #
Support for this library is given as best effort.
This library has not been reviewed or vetted by security professionals.