package crypto

import (
	"bytes"
	"crypto"

	. "github.com/onsi/ginkgo"
	. "github.com/onsi/gomega"
)

var _ = Describe("HKDF", func() {
	// test case A.1 from https://tools.ietf.org/html/rfc5869
	It("extracts", func() {
		salt := []byte{0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc}
		secret := bytes.Repeat([]byte{0x0b}, 22)
		Expect(hkdfExtract(crypto.SHA256, secret, salt)).To(Equal([]byte{0x7, 0x77, 0x9, 0x36, 0x2c, 0x2e, 0x32, 0xdf, 0xd, 0xdc, 0x3f, 0xd, 0xc4, 0x7b, 0xba, 0x63, 0x90, 0xb6, 0xc7, 0x3b, 0xb5, 0xf, 0x9c, 0x31, 0x22, 0xec, 0x84, 0x4a, 0xd7, 0xc2, 0xb3, 0xe5}))
	})
})