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+The digest package provides a function 'digest' for the creation
+of hash digests of arbitrary R objects (using the md5, sha-1, sha-256
+and crc32 algorithms) permitting easy comparison of R language
+objects, as well as a function hmac() to create hash-based message
+authentication code. The md5 algorithm by Ron Rivest is specified
+in RFC 1321, the SHA-1 and SHA-256 algorithms are specified in
+FIPS-180-1 and FIPS-180-2, and the crc32 algorithm is described in
+ftp://ftp.rocksoft.com/cliens/rocksoft/papers/crc_v3.txt. For md5,
+sha-1 and sha-256, this packages uses small standalone implementations
+that were provided by Christophe Devine. For crc32, code from the
+zlib library is used. Please note that this package is not meant
+to be deployed for cryptographic purposes for which more comprehensive
+(and widely tested) libraries such as OpenSSL should be used.
+
+WWW: http://cran.r-project.org/web/packages/digest/