diff options
Diffstat (limited to 'libgo/go/crypto/crypto.go')
| -rw-r--r-- | libgo/go/crypto/crypto.go | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/libgo/go/crypto/crypto.go b/libgo/go/crypto/crypto.go index c913494f61b..ecefc657254 100644 --- a/libgo/go/crypto/crypto.go +++ b/libgo/go/crypto/crypto.go @@ -14,15 +14,15 @@ import ( type Hash uint const ( - MD4 Hash = 1 + iota // in package crypto/md4 - MD5 // in package crypto/md5 - SHA1 // in package crypto/sha1 - SHA224 // in package crypto/sha256 - SHA256 // in package crypto/sha256 - SHA384 // in package crypto/sha512 - SHA512 // in package crypto/sha512 + MD4 Hash = 1 + iota // import code.google.com/p/go.crypto/md4 + MD5 // import crypto/md5 + SHA1 // import crypto/sha1 + SHA224 // import crypto/sha256 + SHA256 // import crypto/sha256 + SHA384 // import crypto/sha512 + SHA512 // import crypto/sha512 MD5SHA1 // no implementation; MD5+SHA1 used for TLS RSA - RIPEMD160 // in package crypto/ripemd160 + RIPEMD160 // import code.google.com/p/go.crypto/ripemd160 maxHash ) @@ -50,8 +50,8 @@ func (h Hash) Size() int { var hashes = make([]func() hash.Hash, maxHash) -// New returns a new hash.Hash calculating the given hash function. If the -// hash function is not linked into the binary, New returns nil. +// New returns a new hash.Hash calculating the given hash function. New panics +// if the hash function is not linked into the binary. func (h Hash) New() hash.Hash { if h > 0 && h < maxHash { f := hashes[h] @@ -59,7 +59,12 @@ func (h Hash) New() hash.Hash { return f() } } - return nil + panic("crypto: requested hash function is unavailable") +} + +// Available reports whether the given hash function is linked into the binary. +func (h Hash) Available() bool { + return h < maxHash && hashes[h] != nil } // RegisterHash registers a function that returns a new instance of the given |
