Function PRF

tls12/tls12.go:14–22

PRF implements the TLS 1.2 pseudo-random function, as defined in RFC 5246, Section 5 and allowed by SP 800-135, Revision 1, Section 4.2.2.

(hash func() H, secret []byte, label string, seed []byte, keyLen int)

// PRF implements the TLS 1.2 pseudo-random function, as defined in RFC 5246,
// Section 5 and allowed by SP 800-135, Revision 1, Section 4.2.2.
func PRF[H hash.Hash](hash func() H, secret []byte, label string, seed []byte, keyLen int) []byte {
	labelAndSeed := make([]byte, len(label)+len(seed))
	copy(labelAndSeed, label)
	copy(labelAndSeed[len(label):], seed)

	result := make([]byte, keyLen)
	pHash(hash, result, secret, labelAndSeed)
	return result
}

// pHash implements the P_hash function, as defined in RFC 5246, Section 5.
func pHash[H hash.Hash](hash1 func() H, result, secret, seed []byte) {