Imports of package hash

PathSynopsis
crypto/md5Package md5 implements the MD5 hash algorithm as defined in RFC 1321.
crypto/sha1Package sha1 implements the SHA-1 hash algorithm as defined in RFC 3174.
crypto/sha256Package sha256 implements the SHA224 and SHA256 hash algorithms as defined in FIPS 180-4.
hashPackage hash provides interfaces for hash functions.