Also, technically bcrypt is not a general hash algorithm, but rather a password-hash construction. Where SHA1 and MD5 are primitives that can be used in arbitra

Also, technically bcrypt is not a general hash algorithm, but rather a password-hash construction. Where SHA1 and MD5 are primitives that can be used in arbitrary crypt constructions, bcrypt is already a construction specialized for passwords. You wouldn't (or at least shouldn't) hash a file with bcrypt.