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CC_crypto(3cc)                       LOCAL                      CC_crypto(3cc)

     Common Crypto -- libSystem digest library

     The libSystem Common Crypto library implements a wide range of crypto-graphic cryptographic
     graphic algorithms used in various Internet standards. The services pro-vided provided
     vided by this library are used by the CDSA implementations of SSL, TLS
     and S/MIME.

     libSystem contains the Common Crypto collection of algorithms. Digest and
     encryption algorithms contained in this library are optimized for speed.
     The algorithms have been collected from various sources and chosen for
     their performance characteristics.  Since libSystem is linked into all
     executables it is preferable for applications to use these functions
     rather than implementing their own versions.

     To use the digest functions with existing code which uses the correspond-ing corresponding
     ing openssl functions, #define the symbol COMMON_DIGEST_FOR_OPENSSL in
     your client code (BEFORE including <CommonCrypto/CommonDigest.h> ).

     You can *NOT* mix and match functions operating on a given data type from
     the two implementations; i.e., if you do a CC_MD5_Init() on a CC_MD5_CTX
     object, do not assume that you can do an openssl-style MD5_Update() on
     that same context.

     The interfaces to the encryption and HMAC algorithms have a calling
     interface that is different from that provided by OpenSSL.

     CC_MD5(3cc), CC_SHA(3cc), CCHmac(3cc), CCCryptor(3cc)

BSD                              April 5, 2007                             BSD