To generate secrete key we can use Java KeyGenerator class which provides the functionality of a secret (symmetric) key generator. Key generators are constructed using one of the getInstance class methods of this class. The secret key is a single key that is used for both encryption and decryption. The Java APIs in the Java Development Kit are very similar, so an understanding of the key pair API in this chapter is necessary. There are many similarities to generating the key pairs.
java-otp is a Java library for generating HOTP (RFC 4226) or TOTP (RFC 6238) one-time passwords.
You can download java-otp as a jar file (it has no dependencies) from the GitHub releases page and add it to your project's classpath. If you're using Maven (or something that understands Maven dependencies) to build your project, you can add java-otp as a dependency:
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java-otp works with Java 8 or newer. If you need support for versions of Java older than Java 8, you may try using java-otp v0.1 (although it is no longer supported).
To demonstrate generating one-time passwords, we'll focus on the TOTP algorithm. To create a TOTP generator with a default password length (6 digits), time step (30 seconds), and HMAC algorithm (HMAC-SHA1):
To actually generate time-based one-time passwords, you'll need a key and a timestamp. Secure key management is beyond the scope of this document; for the purposes of an example, though, we'll generate a random key:
Armed with a key, we can deterministically generate one-time passwords for any timestamp:
…which produces (for one randomly-generated key):
java-otp is published under the MIT License.
Must be unguessable and kept confidential. Any potential leak of a secret is a security incident requiring immediate revocation of the key. The only way to generate a secret is with a secure random generator. Secrets shall never be stored in clear text format. Jan 12, 2020 A one-time password (HOTP/TOTP) library for Java. Contribute to jchambers/java-otp development by creating an account on GitHub. We'll generate a random key.