kubernetes/staging/src/k8s.io/kubectl/pkg/util/hash/hash.go

// ConfigMapHash returns a hash of the ConfigMap.
// The Data, Kind, and Name are taken into account.
func ConfigMapHash(cm *v1.ConfigMap) (string, error) { … }

// SecretHash returns a hash of the Secret.
// The Data, Kind, Name, and Type are taken into account.
func SecretHash(sec *v1.Secret) (string, error) { … }

// encodeConfigMap encodes a ConfigMap.
// Data, Kind, and Name are taken into account.
func encodeConfigMap(cm *v1.ConfigMap) (string, error) { … }

// encodeSecret encodes a Secret.
// Data, Kind, Name, and Type are taken into account.
func encodeSecret(sec *v1.Secret) (string, error) { … }

// encodeHash extracts the first 40 bits of the hash from the hex string
// (1 hex char represents 4 bits), and then maps vowels and vowel-like hex
// characters to consonants to prevent bad words from being formed (the theory
// is that no vowels makes it really hard to make bad words). Since the string
// is hex, the only vowels it can contain are 'a' and 'e'.
// We picked some arbitrary consonants to map to from the same character set as GenerateName.
// See: https://github.com/kubernetes/apimachinery/blob/dc1f89aff9a7509782bde3b68824c8043a3e58cc/pkg/util/rand/rand.go#L75
// If the hex string contains fewer than ten characters, returns an error.
func encodeHash(hex string) (string, error) { … }

// hash hashes `data` with sha256 and returns the hex string
func hash(data string) string { … }