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package shacrypt
import (
"fmt"
"github.com/go-crypt/crypt/algorithm"
)
// Opt describes the functional option pattern for the shacrypt.Hasher.
type Opt func(h *Hasher) (err error)
// WithVariant configures the shacrypt.Variant of the resulting shacrypt.Digest.
// Default is shacrypt.VariantSHA512.
func WithVariant(variant Variant) Opt {
return func(h *Hasher) (err error) {
switch variant {
case VariantNone:
return nil
case VariantSHA256, VariantSHA512:
h.variant = variant
return nil
default:
return fmt.Errorf(algorithm.ErrFmtHasherValidation, AlgName, fmt.Errorf("%w: variant '%d' is invalid", algorithm.ErrParameterInvalid, variant))
}
}
}
// WithVariantName uses the variant name or identifier to configure the shacrypt.Variant of the resulting shacrypt.Digest.
// Default is shacrypt.VariantSHA512.
func WithVariantName(identifier string) Opt {
return func(h *Hasher) (err error) {
if identifier == "" {
return nil
}
variant := NewVariant(identifier)
if variant == VariantNone {
return fmt.Errorf(algorithm.ErrFmtHasherValidation, AlgName, fmt.Errorf("%w: variant identifier '%s' is invalid", algorithm.ErrParameterInvalid, identifier))
}
h.variant = variant
return nil
}
}
// WithSHA256 adjusts this Hasher to utilize the SHA256 hash.Hash.
func WithSHA256() Opt {
return func(h *Hasher) (err error) {
h.variant = VariantSHA256
return nil
}
}
// WithSHA512 adjusts this Hasher to utilize the SHA512 hash.Hash.
func WithSHA512() Opt {
return func(h *Hasher) (err error) {
h.variant = VariantSHA512
return nil
}
}
// WithIterations sets the iterations parameter of the resulting shacrypt.Digest.
// Minimum 1000, Maximum 999999999. Default is 1000000.
func WithIterations(iterations int) Opt {
return func(h *Hasher) (err error) {
if iterations < IterationsMin || iterations > IterationsMax {
return fmt.Errorf(algorithm.ErrFmtHasherValidation, AlgName, fmt.Errorf(algorithm.ErrFmtInvalidIntParameter, algorithm.ErrParameterInvalid, "iterations", IterationsMin, "", IterationsMax, iterations))
}
h.iterations = iterations
return nil
}
}
// WithRounds is an alias for shacrypt.WithIterations.
func WithRounds(rounds int) Opt {
return WithIterations(rounds)
}
// WithSaltLength adjusts the salt size (in bytes) of the resulting shacrypt.Digest.
// Minimum 1, Maximum 16. Default is 16.
func WithSaltLength(bytes int) Opt {
return func(h *Hasher) (err error) {
if bytes < SaltLengthMin || bytes > SaltLengthMax {
return fmt.Errorf(algorithm.ErrFmtHasherValidation, AlgName, fmt.Errorf(algorithm.ErrFmtInvalidIntParameter, algorithm.ErrParameterInvalid, "salt length", SaltLengthMin, "", SaltLengthMax, bytes))
}
h.bytesSalt = bytes
return nil
}
}
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