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Article contents:[[tags: egg]] == message-digest-primitive [[toc:]] == Documentation The Message Digest Primitive Type; reification of a message digest algorithm. === Usage <enscript highlight=scheme> (import message-digest-primitive) </enscript> === Common Argument Definitions {{PRIM}} is a {{message-digest-primitive}} === message-digest-primitive? <procedure>(message-digest-primitive? OBJ) --> boolean</procedure> <procedure>(check-message-digest-primitive LOC OBJ [NAM])</procedure> <procedure>(error-message-digest-primitive LOC OBJ [NAM])</procedure> === message-digest-primitive Accessors <procedure>(message-digest-primitive-context-info PRIM) --> *</procedure> <procedure>(message-digest-primitive-digest-length PRIM) --> fixnum</procedure> <procedure>(message-digest-primitive-init PRIM) --> procedure</procedure> <procedure>(message-digest-primitive-update PRIM) --> procedure</procedure> <procedure>(message-digest-primitive-raw-update PRIM) --> (or #f procedure)</procedure> <procedure>(message-digest-primitive-final PRIM) --> procedure</procedure> <procedure>(message-digest-primitive-block-length PRIM) --> fixnum</procedure> <procedure>(message-digest-primitive-name PRIM) --> symbol</procedure> === 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</procedure> 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 blob 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 {{(or blob string)}} 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) -> *</procedure> Returns a {{message-digest-primitive-context}} object, used by a message digest algorithm. == Requirements [[check-errors]] == Author [[/users/kon-lovett|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|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 [[/egg-svn-checkout|this page]]. == Version history ; 4.3.0 : Add {{message-digest-primitive.types.scm}}. ; 4.2.1 : . ; 4.2.0 : Add make missing update procedure from raw-update procedure argument. ; 4.1.0 : Fix {{make-message-digest-primitive-context}} argument. ; 4.0.0 : CHICKEN 5 release as ''own'' egg. ; 3.9.0 : Add types. ; 3.8.0 : Fix {{message-digest-primitive?}}; accept {{*}}. ; 3.7.1 : ; 3.7.0 : Add {{message-digest-object!}}, {{message-digest-file!}}, and {{message-digest-port!}}. ; 3.6.0 : Add {{START}} and/or {{END}} optional arguments. ; 3.5.0 : Add {{finalize-message-digest!}}. ; 3.4.0 : Deprecate {{message-digest-chunk-read-maker}}. Add {{message-digest-chunk-port-read-maker}}, {{message-digest-chunk-fileno-read-maker}}. Add {{message-digest-primitive-raw-update}}. ; 3.3.0 : Deprecate {{message-digest-default-result-type}}. Add {{message-digest-result-form}}. ; 3.2.0 : Add {{message-digest-default-result-type}}. {{message-digest-chunk-*}} are parameters. ; 3.1.1 : Fix {{check-u8vector}} import. ; 3.1.0 : Added optional {{message-digest-primitive-block-length}}. ; 3.0.5 : Reverted 64 bit support. ; 3.0.4 : Removed 64 bit support. ; 3.0.3 : ; 3.0.2 : Use of compiled setup-helper. ; 3.0.1 : ; 3.0.0 : Removed deprecated procedures to own module. Removed integer packing procedures. Split into many modules. Deprecated some procedures. ; 2.3.8 : Treat integers as unsigned. (Ticket #534) Uses blob for finalization result buffer. ; 2.3.7 : Remove no checks optimization compier options. ; 2.3.6 : Deprecated close-output-digest. Restricted no checks optimization compier option. ; 2.3.5 : The {{'u8vector}} {{RESULT-FORM}} is slightly faster. Revert to allocated context memory. ; 2.3.4 : Try w/o C-level memory allocation so no finalizer needed. ; 2.3.3 : The {{'blob}} {{RESULT-FORM}} is slightly faster. ; 2.3.2 : Deprecated {{byte-string->hexadecimal}}. Deprecated {{string->hex}}, use [[string-utils]] {{string-hexadecimal#string->hex}}. Fix for the default {{message-digest-chunk-read-maker}}, blob was always chunk-size. ; 2.3.1 : Moved some utility routines into own egg(s). ; 2.3.0 : Added {{message-digest-update-char-u8}}, {{message-digest-update-char-be}}, and {{message-digest-update-char-le}}. {{message-digest-update-char}} now treats the actual bit-width of char correctly. ; 2.2.0 : Added [[Byte Packing]] API. Downgraded {{message-digest-chunk-read-maker}}, {{message-digest-chunk-size}} & {{message-digest-chunk-converter}} from {{parameter}}. ; 2.1.1 : Bug fix for hexstring: must use lowercase. ; 2.1.0 : Added message digest "phase" and port APIs. Deprecated old API. ; 2.0.1 : Bug fix for {{(message-digest-chunk-converter)}} use by {{make-binary-message-digest}}. ; 2.0.0 : Release for Chicken 4 [From a diff provided by Christian Kellermann] == License Copyright (C) 2006-2020 Kon Lovett. All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the Software), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED ASIS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Description of your changes:

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