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183 lines
4.1 KiB
V
183 lines
4.1 KiB
V
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module bcrypt
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import encoding.base64
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import crypto.rand
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import crypto.blowfish
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pub const (
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min_cost = 4
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max_cost = 31
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default_cost = 10
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solt_length = 16
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max_crypted_hash_size = 23
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encoded_salt_size = 22
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encoded_hash_size = 31
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min_hash_size = 59
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major_version = '2'
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minor_version = 'a'
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)
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pub struct Hashed {
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mut:
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hash []byte
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salt []byte
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cost int
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major string
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minor string
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}
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const magic_cipher_data = [byte(0x4f727068), 0x65616e42, 0x65686f6c, 0x64657253, 0x63727944,
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0x6f756274]
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pub fn generate_from_password(password []byte, cost int) ?string {
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mut p := new_from_password(password, cost) or { return error('Error: $err') }
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return string(p.hash_byte())
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}
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pub fn compare_hash_and_password(password []byte, hashed_password []byte) ? {
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mut p := new_from_hash(hashed_password) or { return error('Error: $err') }
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p.salt << '=='.bytes()
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other_hash := bcrypt(password, p.cost, p.salt) or { return error('err') }
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mut other_p := Hashed{
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hash: other_hash
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salt: p.salt
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cost: p.cost
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major: p.major
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minor: p.minor
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}
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if string(p.hash_byte()) != string(other_p.hash_byte()) {
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return error('mismatched hash and password')
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}
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}
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pub fn generate_salt() string {
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randbytes := rand.read(bcrypt.solt_length) or { panic(err) }
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return randbytes.bytestr()
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}
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fn new_from_password(password []byte, cost int) ?&Hashed {
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mut cost_ := cost
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if cost < bcrypt.min_cost {
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cost_ = bcrypt.default_cost
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}
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mut p := Hashed{}
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p.major = bcrypt.major_version
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p.minor = bcrypt.minor_version
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if cost_ < bcrypt.min_cost || cost_ > bcrypt.max_cost {
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return error('invalid cost')
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}
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p.cost = cost_
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p.salt = base64.encode(generate_salt().bytes()).bytes()
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hash := bcrypt(password, p.cost, p.salt) or { return err }
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p.hash = hash
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return &p
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}
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fn new_from_hash(hashed_secret []byte) ?&Hashed {
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mut tmp := hashed_secret.clone()
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if tmp.len < bcrypt.min_hash_size {
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return error('hash to short')
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}
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mut p := Hashed{}
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mut n := p.decode_version(tmp) or { return err }
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tmp = tmp[n..]
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n = p.decode_cost(tmp) or { return err }
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tmp = tmp[n..]
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p.salt = tmp[..bcrypt.encoded_salt_size].clone()
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p.hash = tmp[bcrypt.encoded_salt_size..].clone()
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return &p
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}
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fn bcrypt(password []byte, cost int, salt []byte) ?[]byte {
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mut cipher_data := []byte{len: 72 - bcrypt.magic_cipher_data.len, init: 0}
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cipher_data << bcrypt.magic_cipher_data
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mut bf := expensive_blowfish_setup(password, u32(cost), salt) or { return err }
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for i := 0; i < 24; i += 8 {
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for j := 0; j < 64; j++ {
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bf.encrypt(mut cipher_data[i..i + 8], cipher_data[i..i + 8])
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}
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}
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hsh := base64.encode(cipher_data[..bcrypt.max_crypted_hash_size])
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return hsh.bytes()
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}
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fn expensive_blowfish_setup(key []byte, cost u32, salt []byte) ?&blowfish.Blowfish {
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csalt := base64.decode(salt.bytestr())
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mut bf := blowfish.new_salted_cipher(key, csalt) or { return err }
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mut i := u64(0)
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mut rounds := u64(0)
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rounds = 1 << cost
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for i = 0; i < rounds; i++ {
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blowfish.expand_key(key, mut bf)
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blowfish.expand_key(csalt, mut bf)
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}
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return &bf
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}
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fn (mut h Hashed) hash_byte() []byte {
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mut arr := []byte{len: 60, init: 0}
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arr[0] = '$'.bytes()[0]
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arr[1] = h.major.bytes()[0]
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mut n := 2
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if h.minor != '0' {
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arr[2] = h.minor.bytes()[0]
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n = 3
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}
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arr[n] = '$'.bytes()[0]
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n++
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copy(arr[n..], '${int(h.cost):02}'.bytes())
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n += 2
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arr[n] = '$'.bytes()[0]
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n++
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copy(arr[n..], h.salt)
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n += bcrypt.encoded_salt_size
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copy(arr[n..], h.hash)
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n += bcrypt.encoded_hash_size
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return arr[..n]
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}
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fn (mut h Hashed) decode_version(sbytes []byte) ?int {
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if sbytes[0] != '$'.bytes()[0] {
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return error("bcrypt hashes must start with '$'")
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}
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if sbytes[1] != bcrypt.major_version.bytes()[0] {
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return error('bcrypt algorithm version $bcrypt.major_version')
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}
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h.major = sbytes[1].ascii_str()
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mut n := 3
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if sbytes[2] != '$'.bytes()[0] {
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h.minor = sbytes[2].ascii_str()
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n++
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}
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return n
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}
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fn (mut h Hashed) decode_cost(sbytes []byte) ?int {
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cost := string(sbytes[0..2]).int()
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check_cost(cost) or { return err }
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h.cost = cost
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return 3
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}
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fn check_cost(cost int) ? {
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if cost < bcrypt.min_cost || cost > bcrypt.max_cost {
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return error('invalid cost')
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}
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}
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