otp_auth 1.0.1

A Dart package for generating and verifying HOTP and TOTP one-time passwords using RFC 4226 and RFC 6238.

1.0.1

• Fix constant-time comparison to use max length of both strings.
• Fix URI label encoding to use literal colon per Google Authenticator spec.
• Add constructor validation for OTPUri type, HOTP/TOTP digits range, and TOTP period.
• Clamp HOTP.verify window to avoid negative counter values.

1.0.0

• HOTP generation and verification (RFC 4226).
• TOTP generation and verification (RFC 6238).
• SHA-1, SHA-256, SHA-512 algorithm support.
• Base32 encoding and decoding (RFC 4648).
• otpauth:// URI parsing and building.
• Constant-time code comparison.