shamir

func Combine ¶

func Combine(shares []string) (string, error)

*

• Takes a string array of shares encoded in base64 created via Shamir's
• Algorithm; each string must be of equal length of a multiple of 88 characters
• as a single 88 character share is a pair of 256-bit numbers (x, y). *
• Note: the polynomial will converge if the specified minimum number of shares
• or more are passed to this function. Passing thus does not affect it
• Passing fewer however, simply means that the returned secret is wrong.

*

func Create ¶

func Create(minimum int, shares int, raw string) ([]string, error)

*

• Returns a new arary of secret shares (encoding x,y pairs as base64 strings)
• created by Shamir's Secret Sharing Algorithm requring a minimum number of
• share to recreate, of length shares, from the input secret raw as a string

*

func IsValidShare ¶

func IsValidShare(candidate string) bool

*

• Takes in a given string to check if it is a valid secret *
• Requirements:
• Length multiple of 88
• Can decode each 44 character block as base64 *
• Returns only success/failure (bool)

*

func ReconstructSecret ¶

func ReconstructSecret(sharesMap map[int]*big.Int, modulus *big.Int) (secret *big.Int, err error)

ReconstructSecret is used to reconstruct the original secret based on the shares given in the sharesMap parameter. The number of shares given need to be greater than or equal to the threshold, otherwise the result of this function is undefined