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totp.go
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totp.go
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// Package totp generates a Timed One Time Password conforming to RFC6238
package totp
const (
DefaultT0 = "1970-01-01T00:00:00Z"
DefaultX = 30
DefaultCodeDigits = 8
CryptoSHA1 = "HMACSHA1"
CryptoSHA256 = "HMACSHA256"
CryptoSHA512 = "HMACSHA512"
)
type TOTPConfig struct {
// Epoc time in standard format
// eg: "1970-01-01T00:00:00Z"
T0 string
// Time step
// eg 30.0
X int64
// shared secret K
SecretK string
// number of digits in OTP
CodeDigits int
// HMAC algorithm
// enum{'HMACSHA1', 'HMACSHA256', 'HMACSHA512'}
Crypto string
}
/**
Returns a TOTP config object that uses SHA1 for HMAC hashing
and default values for `T0`, `X`, and `CodeDigits`.
The secret key still needs supplied by the user.
*/
func NewDefaultSHA1(seed string) *TOTPConfig {
totp := DefaultConfig(seed)
totp.Crypto = CryptoSHA1
return totp
}
/**
Returns a TOTP config object that uses SHA256 for HMAC hashing
and default values for `T0`, `X`, and `CodeDigits`.
The secret key still needs supplied by the user.
*/
func NewDefaultSHA256(seed string) *TOTPConfig {
totp := DefaultConfig(seed)
totp.Crypto = CryptoSHA256
return totp
}
/**
Returns a TOTP config object that uses SHA512 for HMAC hashing
and default values for `T0`, `X`, and `CodeDigits`.
The secret key still needs supplied by the user.
*/
func NewDefaultSHA512(seed string) *TOTPConfig {
totp := DefaultConfig(seed)
totp.Crypto = CryptoSHA512
return totp
}
// Returns TOTP config object with defaults
func DefaultConfig(seed string) *TOTPConfig {
return &TOTPConfig{
T0: DefaultT0,
X: DefaultX,
SecretK: seed,
CodeDigits: DefaultCodeDigits,
}
}