CC_crypto(3cc) LOCAL CC_crypto(3cc)NAME
Common Crypto — libSystem digest library
DESCRIPTION
The libSystem Common Crypto library implements a wide range of crypto‐
graphic algorithms used in various Internet standards. The services pro‐
vided by this library are used by the CDSA implementations of SSL, TLS
and S/MIME.
OVERVIEW
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.
NOTES
To use the digest functions with existing code which uses the correspond‐
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.
HISTORY
The Common Crypto collection of functions started to become available in
OS X 10.4 and later.
SEE ALSOCC_MD5(3cc), CC_SHA(3cc), CCHmac(3cc), CCCryptor(3cc)BSD April 5, 2007 BSD
