// GetHash returns and instance of hash.Hash using options opts.
// If opts is nil then the default hash function is returned.
func (csp *impl) GetHash(opts bccsp.HashOpts) (h hash.Hash, err error) {
if opts == nil {
return csp.conf.hashFunction(), nil
}
switch opts.(type) {
case *bccsp.SHAOpts:
return csp.conf.hashFunction(), nil
case *bccsp.SHA256Opts:
return sha256.New(), nil
case *bccsp.SHA384Opts:
return sha512.New384(), nil
case *bccsp.SHA3_256Opts:
return sha3.New256(), nil
case *bccsp.SHA3_384Opts:
return sha3.New384(), nil
default:
return nil, fmt.Errorf("Algorithm not recognized [%s]", opts.Algorithm())
}
}
// Hash hashes messages msg using options opts.
func (csp *impl) Hash(msg []byte, opts bccsp.HashOpts) (digest []byte, err error) {
var h hash.Hash
if opts == nil {
h = csp.conf.hashFunction()
} else {
switch opts.(type) {
case *bccsp.SHAOpts:
h = csp.conf.hashFunction()
case *bccsp.SHA256Opts:
h = sha256.New()
case *bccsp.SHA384Opts:
h = sha512.New384()
case *bccsp.SHA3_256Opts:
h = sha3.New256()
case *bccsp.SHA3_384Opts:
h = sha3.New384()
default:
return nil, fmt.Errorf("Algorithm not recognized [%s]", opts.Algorithm())
}
}
h.Write(msg)
return h.Sum(nil), nil
}
