bcrypt 加密算法

The prefix “$2a$” or “$2b$” (or “$2y$”) in a hash string in a shadow password file indicates that hash string is a bcrypt hash in modular crypt format.[3] The rest of the hash string includes the cost parameter, a 128-bit salt (base-64 encoded as 22 characters), and B184 bits of the resulting hash value (base-64…