digest-update

Arguments: context data &key start end external-format foreign

You may need to evaluate (require :digest) to load the digest code before calling this function.

Add data to the running hashing computation in context (digest-init returns a context). data may be a string or an (unsigned-byte 8) vector or (if foreign is true) an integer.

If data is a string, the start and end keyword arguments specify character positions in the string. start defaults to 0 and end defaults to nil, equivalent to the length of the string. external-format specifies the external hashing of the string that will be used to update the context. If not specified, the default external format will be used.

If data is an (unsigned-byte 8) vector, start and end refer to locations in the vector (again defaulting to 0 and nil, meaning the length of the vector). external-format is ignored.

If foreign is non-nil, then data must be an integer address in foreign memory (such as what would be passed to sys:memref) and the bytes contained at that address are used as the input to the digest function.

This function returns no values, but side-effects context.

See MD5, SHA*, HMAC, RC4, and other message digest support in miscellaneous.htm.

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This page was not revised from the 10.0 page.
Created 2019.8.20.