forked from moncho/warpwallet
/
seeds.go
75 lines (59 loc) · 1.35 KB
/
seeds.go
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package warp
import (
"crypto/sha256"
"golang.org/x/crypto/pbkdf2"
"golang.org/x/crypto/scrypt"
)
type result struct {
seed []byte
err error
}
type seedGenerator func() ([]byte, error)
func scryptSeed(passphrase, salt string) seedGenerator {
return func() ([]byte, error) {
return scrypt.Key([]byte(passphrase+"\u0001"), []byte(salt+"\u0001"), 262144, 8, 1, 32)
}
}
func pbkdf2Seed(passphrase, salt string) seedGenerator {
return func() ([]byte, error) {
dk := pbkdf2.Key([]byte(passphrase+"\u0002"), []byte(salt+"\u0002"), 65536, 32, sha256.New)
return dk, nil
}
}
//xorSeeds xor's the result of the given seedGenerators
func xorSeeds(generators ...seedGenerator) seedGenerator {
return func() ([]byte, error) {
genCount := len(generators)
results := make(chan result, genCount)
done := make(chan struct{})
defer close(results)
defer close(done)
for _, g := range generators {
go func(s seedGenerator) {
b, err := s()
select {
case results <- result{b, err}:
case <-done:
}
}(g)
}
var finalKey []byte
for i := 0; i < genCount; i++ {
r := <-results
if r.err != nil {
return nil, r.err
}
if finalKey == nil {
finalKey = r.seed
} else {
blockXOR(finalKey, r.seed)
}
}
return finalKey, nil
}
}
func blockXOR(dst, src []byte) {
for i, v := range src {
dst[i] ^= v
}
}