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The Common Crypto library in Mac OS X 10.4 and later provides simple APIs for five SHA algorithms:

CC_SHA1() computes the SHA-1 message digest of the len bytes at data and places it in md (which must have space for CC_SHA1_DIGEST_LENGTH == 20 bytes of output). It returns the md pointer.

CC_SHA1_Init() initializes a CC_SHA1_CTX structure.

CC_SHA1_Update() can be called repeatedly with chunks of the message to be hashed (len bytes at data).

CC_SHA1_Final() places the message digest in md, which must have space for CC_SHA1_DIGEST_LENGTH == 20 bytes of output, and erases the CC_SHA1_CTX.

The successor versions of SHA-1, SHA-2, are also implemented for hash bit lengths of 224, 256, 384, and 512. The functions to call to invoke the larger hash-size versions of the algorithms include the hash size as part of the function names: …

RETURN VALUES

All routines return 1 except for the one-shot routines ( CC_SHA1(), etc.), which return the pointer passed in via the md parameter.

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