message-digest-primitive

Documentation

The Message Digest Primitive Type; reification of a message digest algorithm.

Usage

(import message-digest-primitive)

Common Argument Definitions

PRIM is a message-digest-primitive

message-digest-primitive?

(message-digest-primitive? OBJ) --> boolean(check-message-digest-primitive LOC OBJ [NAM])(error-message-digest-primitive LOC OBJ [NAM])

message-digest-primitive accessors

(message-digest-primitive-context-info PRIM) --> *(message-digest-primitive-digest-length PRIM) --> fixnum(message-digest-primitive-init PRIM) --> procedure(message-digest-primitive-update PRIM) --> procedure(message-digest-primitive-raw-update PRIM) --> (or #f procedure)(message-digest-primitive-final PRIM) --> procedure(message-digest-primitive-block-length PRIM) --> fixnum(message-digest-primitive-name PRIM) --> symbol

make-message-digest-primitive

[procedure]

(make-message-digest-primitive CONTEXT-INFO DIGEST-SIZE INIT UPDATE FINAL [block-length 4] [name 'mdp] [raw-update #f]) -> message-digest-primitive

Create a message-digest-primitive object, defining a message digest algorithm.

The processing of a message digest is split into three phases: initialization, update, & finalization. These are represented by procedures: INIT, UPDATE | RAW-UPDATE, & FINAL, respectively.

CONTEXT-INFO: (or (CONTEXT-INFO -> context-object) positive-fixnum)

(CONTEXT-INFO -> CONTEXT) ; returns the context-object, which should be unique. At least the object cannot be shared with another activated primitive.
positive-fixnum : a memory-block of length CONTEXT-INFO bytes is allocated; the memory is automatically free'ed. The context-object here is a {pointer}} to a block of uninitialized memory.

DIGEST-SIZE: positive-fixnum

The count of bytes in the result.

INIT: (CONTEXT -> void))

sets up the CONTEXT.

UPDATE: #f or (CONTEXT SOURCE COUNT -> void))

Must accumulate the SOURCE, beginning at 0, for COUNT bytes. Will be called zero or more times. SOURCE is usually a (or bytevector string) object.
COUNT is the actual number of bytes in the SOURCE. Only the first COUNT bytes in the SOURCE are valid. COUNT is a positive-fixnum.
when #f & RAW-UPDATE then an UPDATE is built, otherwise an error.

FINAL: (CONTEXT DESTINATION -> void)).

Must build the message-digest result in the supplied result DESTINATION, which will have a byte-count of at least DIGEST-SIZE. DESTINATION is usually a bytevector object.

RAW-UPDATE: (CONTEXT POINTER COUNT -> void)).

When UPDATE is #f RAW-UPDATE must be defined.
Must accumulate the memory at POINTER, beginning at 0, for COUNT bytes. Will be called zero or more times.
COUNT is the actual number of bytes in the SOURCE. Only the first COUNT bytes in the memory at POINTER are valid. COUNT is a positive-fixnum.

BLOCK-LENGTH: positive-fixnum ; default 4

The primitive's accumulator length in bytes.

NAME: (or symbol string) ; default uninterned-symbol.

Identifies the message digest algorithm. The suggested form is <algorithm>-primitive, 'md5-primitive for example.

make-message-digest-primitive-context

[procedure] (make-message-digest-primitive-context PRIM) -> *

Returns a message-digest-primitive-context object, used by a message digest algorithm.

Requirements

check-errors

Author

Kon Lovett

Repository

This egg is hosted on the CHICKEN Subversion repository:

https://anonymous@code.call-cc.org/svn/chicken-eggs/release/5/message-digest-primitive

If you want to check out the source code repository of this egg and you are not familiar with Subversion, see this page.

Version history

4.4.0: CHICKEN 6 release.

License

 Copyright (C) 2006-2026 Kon Lovett.  All rights reserved.

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