The Cryptographic Protocol Shapes Analyzer (CPSA) has been released on Hackage at http://hackage.haskell.org/package/cpsa. CPSA attempts to enumerate all essentially different executions possible for a cryptographic protocol. We call them the shapes of the protocol. Naturally occurring protocols have only finitely many, indeed very few shapes. Authentication and secrecy properties are easy to determine from them, as are attacks and anomalies. For each input problem, the CPSA program is given some initial behavior, and it descovers what shapes are compatible with it. Normally, the initial behavior is from the point of view of one participant. The analysis reveals what the other participants must have done, given the participant's view. We are working towards a version of CPSA with the property that whenever it successfully terminates, every possible execution is described by its output. However, the current implementation occasionally fails to find some executions. The package contains a set of programs used to perform and display the analysis. Program documentation is in the doc directory in the source distribution, and installed in the package's data directory. You can locate the package's data directory by searching for the file cpsauser.html. New users should study the documentation and the sample inputs in the data directory. The theory and algorithm used by CPSA was developed with the help of Joshua D. Guttman, John D. Ramsdell, Jon C. Herzog, Shaddin F. Doghmi, F. Javier Thayer, and Paul D. Rowe. John D. Ramsdell implemented the algorithm in Haskell.