TrueCloudLab/rfc6979
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Small cleanup.

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This commit is contained in:
Coda Hale 2013-08-20 17:39:06 -07:00
parent ce0a68115f
commit 2c93b6d329
1 changed files with 3 additions and 5 deletions
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8
rfc6979.go
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@ -80,10 +80,10 @@ func bits2octets(in []byte, q *big.Int, qlen, rolen int) []byte {
// https://tools.ietf.org/html/rfc6979#section-3.2
func generateSecret(q, x *big.Int, alg HashAlgorithm, hash []byte, test func(*big.Int) bool) {
// Step A
qlen := q.BitLen()
holen := alg().Size()
rolen := (qlen + 7) >> 3
bx := append(int2octets(x, rolen), bits2octets(hash, q, qlen, rolen)...)
// Step B
v := bytes.Repeat([]byte{0x01}, holen)
@ -92,9 +92,6 @@ func generateSecret(q, x *big.Int, alg HashAlgorithm, hash []byte, test func(*bi
k := bytes.Repeat([]byte{0x00}, holen)
// Step D
b := int2octets(x, rolen)
bh := bits2octets(hash, q, qlen, rolen)
bx := append(b, bh...)
k = alg.mac(k, append(append(v, 0x00), bx...))
@ -107,6 +104,7 @@ func generateSecret(q, x *big.Int, alg HashAlgorithm, hash []byte, test func(*bi
// Step G
v = alg.mac(k, v)
// Step H
for {
// Step H1
t := make([]byte, 0)
@ -117,12 +115,12 @@ func generateSecret(q, x *big.Int, alg HashAlgorithm, hash []byte, test func(*bi
t = append(t, v...)
}
// Step H3
secret := bits2int(t, qlen)
if secret.Cmp(big.NewInt(1)) >= 0 && secret.Cmp(q) < 0 && test(secret) {
return
}
k = alg.mac(k, append(v, 0x00))
v = alg.mac(k, v)
}
}