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message-digest

Documentation

Message Digest provides support for message digest primitives. A message-digest is a function taking some input source and returning a fixed-length hash.

For best results the source object(s) to be accumulated into the digest should be something easily treated as a {}{bytevector}}.

Message Digest Byte Vector

Digest routines for string & blob.

Usage

(use message-digest-byte-vector)

message-digest-update-blob

[procedure] (message-digest-update-blob DIGEST BLOB [START [END]])

Update the DIGEST with a BLOB, optionally sliced by START END.

message-digest-update-string

[procedure] (message-digest-update-string DIGEST STRING [START [END]])

Update the DIGEST with a STRING, optionally sliced by START END.

message-digest-string

[procedure] (message-digest-string PRIM STRING [RESULT-FORM [START [END]]]) -> message-digest-result-type

Returns the RESULT for the digest algorithm PRIM applied to STRING, optionally sliced by START END, in the RESULT-FORM.

RESULT-FORM default is (message-digest-result-form).

message-digest-blob

[procedure] (message-digest-blob PRIM BLOB [RESULT-FORM [START [END]]]) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to BLOB, optionally sliced by START END, in the RESULT-FORM.

RESULT-FORM default is (message-digest-result-form).

message-digest-string!

[procedure] (message-digest-string! PRIM STRING BUFFER [START [END]]) -> message-digest-result-type

Returns the RESULT for the digest algorithm PRIM applied to STRING, optionally sliced by START END, in the BUFFER.

message-digest-blob!

[procedure] (message-digest-blob! PRIM BLOB BUFFER [START [END]]) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to BLOB, optionally sliced by START END, in the {BUFFER}.

message-digest-update-substring (DEPRECATED)

[procedure] (message-digest-update-substring DIGEST STRING START END)

Update the DIGEST with a substring STRING START END.

Message Digest Int

Provides digest update operations for character and integer datatypes.

Usage

(use message-digest-int)

message-digest-update-char-u8

[procedure] (message-digest-update-char-u8 DIGEST CHAR)

Update the DIGEST with the low-order 8-bits of a character CHAR.

message-digest-update-char

[procedure] (message-digest-update-char DIGEST CHAR [ENDIAN])

Update the DIGEST with a the character CHAR 32-bit integer value treated as ENDIAN.

ENDIAN default is (machine-byte-order).

message-digest-update-char-be

[procedure] (message-digest-update-char-be DIGEST CHAR)

Update the DIGEST with a the character CHAR 32-bit integer value treated as big-endian.

message-digest-update-char-le

[procedure] (message-digest-update-char-le DIGEST CHAR)

Update the DIGEST with a the character CHAR 32-bit integer value treated as little-endian.

message-digest-update-u8

[procedure] (message-digest-update-u8 DIGEST U8)

Update the DIGEST with an 8-bit integer U8.

message-digest-update-u16

[procedure] (message-digest-update-u16 DIGEST U16 [ENDIAN])

Update the DIGEST with a 16-bit integer U16 treated as ENDIAN.

ENDIAN default is (machine-byte-order).

message-digest-update-u16-be

[procedure] (message-digest-update-u16-be DIGEST U16)

Update the DIGEST with a 16-bit integer U16 treated as big-endian.

message-digest-update-u16-le

[procedure] (message-digest-update-u16-le DIGEST U16)

Update the DIGEST with a 16-bit integer U16 treated as little-endian.

message-digest-update-u32

[procedure] (message-digest-update-u32 DIGEST U32 [ENDIAN])

Update the DIGEST with a 32-bit integer U32 treated as ENDIAN.

ENDIAN default is (machine-byte-order).

message-digest-update-u32-be

[procedure] (message-digest-update-u32-be DIGEST U32)

Update the DIGEST with a 32-bit integer U32 treated as big-endian.

message-digest-update-u32-le

[procedure] (message-digest-update-u32-le DIGEST U32)

Update the DIGEST with a 32-bit integer U32 treated as little-endian.

message-digest-update-u64

[procedure] (message-digest-update-u64 DIGEST U64 [ENDIAN])

Update the DIGEST with a 64-bit integer U64 treated as ENDIAN.

ENDIAN default is (machine-byte-order).

message-digest-update-u64-be

[procedure] (message-digest-update-u64-be DIGEST U64)

Update the DIGEST with a 64-bit integer U64 treated as big-endian.

message-digest-update-u64-le

[procedure] (message-digest-update-u64-le DIGEST U64)

Update the DIGEST with a 64-bit integer U64 treated as little-endian.

Message Digest Update Item

Provides digest update operations for Scheme objects.

Usage

(use message-digest-update-item)

message-digest-update-file

[procedure] (message-digest-update-file DIGEST FILENAME)

Update the DIGEST with the contents of file FILENAME.

message-digest-update-procedure

[procedure] (message-digest-update-procedure DIGEST THUNK)

Update the DIGEST with a THUNK until it returns #f.

THUNK is a (-> byte-source).

message-digest-update-port

[procedure] (message-digest-update-port DIGEST INPUT-PORT)

Update the DIGEST with byte-source from an INPUT-PORT until #!eof encountered.

Uses the message-digest-chunk-read-maker to create a reader for the port.

message-digest-update-object

[procedure] (message-digest-update-object DIGEST SOURCE [START [END]])

Update the DIGEST with some SOURCE.

SOURCE maybe

input-port

as in message-digest-update-port

procedure

as in message-digest-update-procedure

string

blob

srfi-4-vector

*

((message-digest-chunk-converter) SOURCE) -> byte-source.

If START END supplied, and possible, the byte-source is sliced.

Message Digest Item

Provides digest operations for whole Scheme objects.

Usage

(use message-digest-item)

message-digest-object

[procedure] (message-digest-object PRIM SOURCE [RESULT-FORM [START [END]]]) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to SOURCE, optionally sliced by START END, in the RESULT-FORM.

RESULT-FORM default is (message-digest-result-form).

message-digest-file

[procedure] (message-digest-file PRIM FILENAME [RESULT-FORM]) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to the file FILENAME in the RESULT-FORM. Reads until #!eof encountered.

RESULT-FORM default is (message-digest-result-form).

message-digest-port

[procedure] (message-digest-port PRIM INPUT-PORT [RESULT-FORM]) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to INPUT-PORT in the RESULT-FORM. Reads until #!eof encountered.

RESULT-FORM default is (message-digest-result-form).

message-digest-object!

[procedure] (message-digest-object! PRIM SOURCE BUFFER [START [END]]) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to SOURCE, optionally sliced by START END, in the BUFFER.

message-digest-file!

[procedure] (message-digest-file! PRIM FILENAME BUFFER) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to the file FILENAME in the BUFFER. Reads until #!eof encountered.

message-digest-port!

[procedure] (message-digest-port! PRIM INPUT-PORT BUFFER) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to INPUT-PORT in the BUFFER. Reads until #!eof encountered.

Message Digest SRFI 4

Provides digest operations for SRFI-4 packed-vectors.

Usage

(use message-digest-srfi-4)

message-digest-update-u8vector

[procedure] (message-digest-update-u8vector DIGEST U8VECTOR [START [END]])

Update the DIGEST with a U8VECTOR, optionally sliced by START END.

message-digest-u8vector

[procedure] (message-digest-u8vector PRIM U8VECTOR [RESULT-FORM [START [END]]]) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to U8VECTOR, optionally sliced by START END, in the RESULT-FORM.

RESULT-FORM default is (message-digest-result-form).

message-digest-u8vector!

[procedure] (message-digest-u8vector! PRIM U8VECTOR BUFFER [START [END]]) -> message-digest-result-type

Returns the result for the digest algorithm PRIM applied to U8VECTOR, optionally sliced by START END, in the BUFFER.

message-digest-update-subu8vector (DEPRECATED)

[procedure] (message-digest-update-subu8vector DIGEST U8VECTOR START END)

Update the DIGEST with a subvector U8VECTOR START END.

message-digest-update-bytevector (DEPRECATED)

[procedure] (message-digest-update-bytevector DIGEST BYTEVECTOR [LENGTH])

Update the DIGEST with the BYTEVECTOR, a blob, string, or srfi-4-vector.

The LENGTH is the byte count. Default is the size in bytes of the BYTEVECTOR.

Message Digest Port

Provides a port abstraction for a message-digest-primitive.

Usage

(use message-digest-port)

Common Argument Definitions

PORT is a digest-output-port.

digest-output-port

[procedure] (digest-output-port? OBJ) -> boolean
[procedure] (check-digest-output-port LOC OBJ [NAM])
[procedure] (error-digest-output-port LOC OBJ [NAM])
[procedure] (digest-output-port-name PORT) -> string

open-output-digest

[procedure] (open-output-digest PRIM) -> digest-output-port

Returns a message digest output port for the supplied algorithm PRIM.

The initialization phase.

get-output-digest

[procedure] (get-output-digest PORT [RESULT-FORM]) -> string

Closes the PORT and returns the result as a RESULT-FORM.

RESULT-FORM default is (message-digest-result-form).

The finalization phase.

call-with-output-digest

[procedure] (call-with-output-digest PRIM PROC [RESULT-FORM]) -> message-digest-result-type

Returns the result of the call of PROC with an open-output-digest for PRIM in the RESULT-FORM.

RESULT-FORM default is (message-digest-result-form).

with-output-to-digest

[procedure] (with-output-to-digest PRIM THUNK [RESULT-FORM]) -> message-digest-result-type

Invoke the procedure THUNK with (current-output-port) bound to a digest-output-port and return in the RESULT-FORM.

RESULT-FORM default is (message-digest-result-form).

Message Digest Chunk

An inchoate Chunking API.

Usage

(use message-digest-chunk)

message-digest-chunk-port-read-maker

[parameter] (message-digest-chunk-port-read-maker [CONSTRUCTOR]) -> procedure

Supplies the procedure used to create an input procedure.

CONSTRUCTOR is a (INPUT-PORT #!optional SIZE) -> (-> byte-source). The first argument is the chunk source port and the second argument is the size of chunks.

The default CONSTRUCTOR will return a procedure that reads from INPUT-PORT in (message-digest-chunk-size) bytes.

message-digest-chunk-fileno-read-maker

[parameter] (message-digest-chunk-fileno-read-maker [CONSTRUCTOR]) -> procedure

Supplies the procedure used to create an input procedure.

CONSTRUCTOR is a FD #!optional SIZE) -> (-> byte-source)). The first argument is the chunk source open fileno and the second argument is the size of chunks.

The default CONSTRUCTOR will return a procedure that reads from FD in (file-size FD) bytes.

message-digest-chunk-size

[parameter] (message-digest-chunk-size [SIZE]) -> positive-integer

The number of bytes to read from a binary-stream during the message-digest update phase. Used by the default message-digest-chunk-read-maker.

SIZE is a positive-integer, with default 1024.

message-digest-chunk-converter

[parameter] (message-digest-chunk-converter [CONVERTER]) -> (or #f procedure)

The procedure used to translate an arbitrary object into something suitable for an UPDATE procedure. See make-message-digest-primitive.

CONVERTER is a (* -> byte-source) or #f.

The default CONVERTER is #f.

Should the CONVERTER be #f or return #f then no translation is attempted.

message-digest-chunk-read-maker (DEPRECATED)

[parameter] (message-digest-chunk-read-maker [CONSTRUCTOR]) -> procedure

Synonym for message-digest-chunk-port-read-maker.

Examples

Uses the message-digest port abstraction to get an MD5 digest of a string:

(use message-digest-port md5) ; Or sha1, or sha2, ...

(call-with-output-digest (md5-primitive) (cut display "foo" <>))
;=> "acbd18db4cc2f85cedef654fccc4a4d8"

Bugs and Limitations

• Only messages on a byte-boundary supported. Bit-boundary messages are not handled.
• The number update routines will not process an integer represented as anything other than a fixnum or flonum.
• Since Chicken does not really have a binary port the digest-output-port will only accumulate strings. For example, writing a 16-bit integer is actually writing the result of number->string and not the 16-bit value itself! To get this effect the value must first be packed into a string and then written. However, the extras#write-byte routine should function as expected with a digest-output-port.
• The chunk-converter and source-reader interface is clumsy.

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.

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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