hotp

Description:

hotp

HMAC-based One-time Password (HOTP) #
This is an implementation of the HOTP algorithm as specified in RFC 4226.

Installation #
dart pub add hotp
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Usage #
final hotp = Hotp(secret: '12345678901234567890'.codeUnits);

// Generate a HOTP
final password = hotp.generate(counter: 0); // 755224
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Base32 encoding #
final hotp = Hotp.fromBase32('GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ');

print(hotp.generate(counter: 0)); // 755224
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Supported algorithms #

SHA1 - default, as specified in RFC 4226
SHA256
SHA512

APIs #
Constructor parameters #



Name
Type
Description




secret
List<int>
The secret key.


algorithm
Algorithm
The algorithm to use.


digits
int
The number of digits to generate.



If you want to use a Base32 encoded secret, use the fromBase32 constructor.



Name
Type
Description




secret
String
The Base32 encoded secret key.


digits
int
The number of digits to generate.


algorithm
Algorithm
The algorithm to use.


encoding
Encoding
The encoding to use.



Methods #



Name
Return type
Description




generate
int
Generates a HOTP for the given counter.


validate
bool
Validates a HOTP for the given counter.



Exported other package types #



Name
Type
Description




base32
class
Base32 encoding and decoding util


Encoding
int
Base32 encoding and decoding alg



License #
The project is licensed under the MIT license.