evalphobia/hierogolyph

package argon2

import (
    "encoding/hex"

    "golang.org/x/crypto/argon2"
)

const (
    // see: https://godoc.org/golang.org/x/crypto/argon2
    defaultArgon2Time      = 1
    defaultArgon2Memory    = 64 * 1024
    defaultArgon2Threads   = 4
    defaultArgon2KeyLength = 32
)

// Argon2 is struct to create hash using Argon2id.
type Argon2 struct {
    Time      uint32
    Memory    uint32
    Threads   uint8
    KeyLength uint32
}

// Hash creates hased text from password and salt using Argon2id.
func (a Argon2) Hash(password, salt string) string {
    return hex.EncodeToString(argon2.IDKey(
        []byte(password),
        []byte(salt),
        a.getTime(),
        a.getMemory(),
        a.getThreads(),
        a.getKeyLength(),
    ))
}

func (a Argon2) getTime() uint32 {
    if a.Time == 0 {
        return defaultArgon2Time
    }
    return a.Time
}

func (a Argon2) getMemory() uint32 {
    if a.Memory == 0 {
        return defaultArgon2Memory
    }
    return a.Memory
}

func (a Argon2) getThreads() uint8 {
    if a.Threads == 0 {
        return defaultArgon2Threads
    }
    return a.Threads
}

func (a Argon2) getKeyLength() uint32 {
    if a.KeyLength == 0 {
        return defaultArgon2KeyLength
    }
    return a.KeyLength
}