NewDriverAudio creates a driver of audio.

NewDriverChinese creates a driver of Chinese characters.

NewDriverDigit creates a digit driver.

NewDriverLetter creates a letter driver.

NewDriverMath creates a math driver.

NewDriverString creates a string driver.

NewItemChar creates a captcha item of characters.

RandomBytes returns a byte slice of the given length read from CSPRNG.

RandomColor returns a random color.RGBA.

RandomDigits returns a byte slice of the given length, where each byte is a.

RandomInt returns a random integer in range [0, n)].

RandomRange returns a random number in range [from, to).].

RandomString returns a random string of given size.

RandomText returns a random string of given size.

MimeTypeAudio output base64 mine-type.

MimeTypeImage output base64 mine-type.

OptionShowHollowLine shows hollow line.

OptionShowSineLine shows sine line.

OptionShowSlimeLine shows slime line.

DefaultDriverAudio is a default audio driver.

DefaultDriverChinese is a default chinese driver.

DefaultDriverDigit is a default digit driver.

DefaultDriverLetter is a default letter driver.

DefaultDriverMath is a default math driver.

DefaultDriverString is a default string driver.

DriverAudio captcha config for captcha-engine-audio.

DriverChinese config for chinese driver.

DriverDigit config for digit driver.

DriverLetter config for letter driver.

DriverMath config for math driver.

DriverString config for string driver.

ItemAudio captcha-audio-engine return type.

ItemChar captcha item of unicode characters.

Driver captcha interface for captcha engine to write staff.

Item is captcha item interface.