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package pbkdf2
import (
"crypto/sha1" //nolint:gosec
"crypto/sha256"
"crypto/sha512"
"github.com/go-crypt/crypt/algorithm"
)
// NewVariant converts an identifier string to a pbkdf2.Variant.
func NewVariant(identifier string) (variant Variant) {
switch identifier {
case AlgIdentifier, AlgIdentifierSHA1, algorithm.DigestSHA1:
return VariantSHA1
case AlgIdentifierSHA224, algorithm.DigestSHA224:
return VariantSHA224
case AlgIdentifierSHA256, algorithm.DigestSHA256:
return VariantSHA256
case AlgIdentifierSHA384, algorithm.DigestSHA384:
return VariantSHA384
case AlgIdentifierSHA512, algorithm.DigestSHA512:
return VariantSHA512
default:
return VariantNone
}
}
// Variant is a variant of the pbkdf2.Digest.
type Variant int
const (
// VariantNone is a variant of the pbkdf2.Digest which is unknown.
VariantNone Variant = iota
// VariantSHA1 is a variant of the pbkdf2.Digest which uses HMAC-SHA-1.
VariantSHA1
// VariantSHA224 is a variant of the pbkdf2.Digest which uses HMAC-SHA-224.
VariantSHA224
// VariantSHA256 is a variant of the pbkdf2.Digest which uses HMAC-SHA-256.
VariantSHA256
// VariantSHA384 is a variant of the pbkdf2.Digest which uses HMAC-SHA-384.
VariantSHA384
// VariantSHA512 is a variant of the pbkdf2.Digest which uses HMAC-SHA-512.
VariantSHA512
)
// String implements the fmt.Stringer returning a string representation of the pbkdf2.Variant.
func (v Variant) String() (variant string) {
switch v {
case VariantSHA1:
return algorithm.DigestSHA1
case VariantSHA224:
return algorithm.DigestSHA224
case VariantSHA256:
return algorithm.DigestSHA256
case VariantSHA384:
return algorithm.DigestSHA384
case VariantSHA512:
return algorithm.DigestSHA512
default:
return
}
}
// Prefix returns the pbkdf2.Variant prefix identifier.
func (v Variant) Prefix() (prefix string) {
switch v {
case VariantSHA1:
return AlgIdentifier
case VariantSHA224:
return AlgIdentifierSHA224
case VariantSHA256:
return AlgIdentifierSHA256
case VariantSHA384:
return AlgIdentifierSHA384
case VariantSHA512:
return AlgIdentifierSHA512
default:
return
}
}
// HashFunc returns the internal HMAC algorithm.HashFunc.
func (v Variant) HashFunc() algorithm.HashFunc {
switch v {
case VariantSHA1:
return sha1.New
case VariantSHA224:
return sha256.New224
case VariantSHA256:
return sha256.New
case VariantSHA384:
return sha512.New384
case VariantSHA512:
return sha512.New
default:
return nil
}
}
// DefaultIterations returns the default iterations for a variant.
func (v Variant) DefaultIterations() int {
switch v {
case VariantSHA1, VariantSHA224:
return IterationsDefaultSHA1
case VariantSHA256, VariantSHA384:
return IterationsDefaultSHA256
case VariantSHA512:
return IterationsDefaultSHA512
default:
return IterationsDefaultSHA1
}
}
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