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message-digest

Documentation

The Message Digest Type provides support for an active message digest primitive.

Usage

(use message-digest-type)

Common Argument Definitions

RESULT-FORM is a message-digest-result-form, one of:

'byte-string 'string

the result bytes as a string; these are raw bytes, not characters!

'blob

the result bytes as a blob.

'u8vector

the result bytes as a u8vector.

'hex-string 'hex 'hexstring

the result bytes encoded as a string of lower-case hexadecimal digits.

DIGEST is a message-digest.

ENDIAN is one of 'big-endian, 'little-endian.

SOURCE is a Scheme object.

The buffer argument for the update phase is translated as:

string

buffer is SOURCE.

blob

buffer is SOURCE.

srfi-4-vector

buffer from (...vector->blob/shared SOURCE).

procedure

updates with buffer from (procedure) until #f.

input-port

like procedure above but from ((message-digest-chunk-read-maker) SOURCE).

pointer

buffer is SOURCE, thru the digest primitive raw-update usually.

*

buffer from (message-digest-chunk-converter SOURCE).

Should none of the above interpretations be available then an error is signaled.

A byte-source is one of string, blob, or srfi-4-vector.

message-digest-result-type is (or blob string u8vector)

message-digest-result-form

[parameter] (message-digest-result-form [RESULT-FORM]) -> symbol

The initial RESULT-FORM value is 'hex-string.

A RESULT-FORM of #f resets to the initial value.

initialize-message-digest

[procedure] (initialize-message-digest PRIM) -> message-digest

Returns a new, initialized, message-digest for the supplied algorithm PRIM.

Initialized here means the intialization phase is completed.

message-digest?

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

message-digest-algorithm

[procedure] (message-digest-algorithm DIGEST) -> message-digest-primitive

Returns the message digest algorithm used by this DIGEST.

Mostly for use when developing an update operation.

Do not mess with this object!

finalize-message-digest

[procedure] (finalize-message-digest DIGEST [RESULT-FORM]) -> message-digest-result-type

Finalize the DIGEST and return the result in the RESULT-FORM.

RESULT-FORM

message-digest-result-form ; default (message-digest-result-form).

Finalize here means the finalization phase is completed. The DIGEST is not in a useful state.

finalize-message-digest!

[procedure] (finalize-message-digest! DIGEST BUFFER) -> message-digest-result-type

Finalize the DIGEST and return the result in the BUFFER.

The BUFFER must be a string, blob, or u8vector of sufficient size; checked at runtime. Does not perform any initialization of the BUFFER.

The result starts at the beginning of the BUFFER, and runs for (message-digest-primitive-digest-length (message-digest-algorithm DIGEST)) bytes. Result is binary only.

Finalize here means the finalization phase is completed. The DIGEST is not in a useful state.

setup-message-digest-buffer!

[procedure] (setup-message-digest-buffer! DIGEST SIZE)

Ensure the DIGEST has a buffer of at least SIZE bytes.

Notes

• If someone needs to construct a message-digest phase procedure that cannot be built upon the existing public API please contact the maintainer. There are some routines that can be exported to aid in such a project. It must be pointed out that the message-digest port/file API is implemented using only the existing public API.

Requirements

check-errors blob-utils string-utils

Author

Kon Lovett

Version history

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) 2006-2018 Kon Lovett.  All rights reserved.

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 to deal in the Software without restriction, including without limitation
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 Software is furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included
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