ng:checksum

ng:checksum

The built in function, ng:checksum(InputText,Method) returns the calculated checksum for a text input (InputText) and a given method (Method). Please note, that the function returns the checksum only and not the InputText with the added checksum.

The function has these two input parameters:

TextToEncrypt
This first parameter is the input text for which the checksum is to be calculated. This must be a string, which means, that if you want to use a number as input, then you need either to delimit the number with single or double quotes or use the string function to convert the number into a string.

Method
The method of checksum to use. 
These methods can be used:
(The value must be written in lower case exactly as shown below.)
Value
Short description
Additional description
Example
mod10
Modulus 10 / Luhn formula
Used in credit cards checksums, IMEI for preventing accidental typing errors. ISO/IEC 7812-1
ng:checksum('123456789','mod10') 
returns 7
pzn
Modulus 11 / PZN PharmaZentralNummer
Used for pharmaceutical products.
ng:checksum('1234567','pzn')
returns 3
isbn10
Modulus 11 / ISBN 10 - International standard book number
Identifies a book by 9 digits and a control digit.
ng:checksum('034539180','isbn10')
returns 2
isbn13
EAN13 / ISBN 13 - International standard book number
Identifies a book by 12 digits and a control digit. This is identical to an EAN 13 checksum and can be used in an EAN 13 barcode. (ISBN10 and ISBN13 are currently interchangeable numbers)
ng:checksum('978034539180','isbn13')
returns 3
issn
ISSN / International standard serial number
Represents periodical items, like a magazine, newspaper
ng:checksum('0360528','issn')
returns 0
mod43
Modulo43
Often used in code39 barcodes
ng:checksum('1234567AB','mod43')
Returns 6
crc32
CRC-32 / ISO-HDLC Cyclic redundancy check
Used as integrity test of data,  specially in from volatile medias or in zip files.
ng:checksum('ABCDEFGHIJKLMN','crc32')
Returns 2871390021 (always a 32 bit number)
md5
MD5 / Message-digest algorithm
Used for data verification and is modified checks. Historically used for password encryption (Unsafe for security purposes)
ng:checksum('ABCDEFGHIJKLMN','md5')
Returns 47e441c9bbd571f97fc86c5be32f6cc0 (Hex representation of bytes)
sha1
SHA1 / Secure Hash Algorithm 1
Used for data verification (In GitHub and other places. Historically used for password encryption (Considered unsafe today, but requires a lot of CPU power to break)
ng:checksum('ABCDEFGHIJKLMN','sha1')
Returns 6238bf61dd8df8f77156b2378e9e39cd3939680c (Hex representation of bytes)
sha256
SHA256 / Secure Hash Algorithm 2 (256)
Used for password encryption, considered safe.
ng:checksum('ABCDEFGHIJKLMN','sha256')
Returns: 93c5f007220b38ab257456a0e96540d148d4425cf91569dbcdfe6b72685538a4 (Hex representation of bytes)
fik
FIK - Fælles indbtalingskort (Common payment slip)
The Danish Giro kort / indbetalingskort payment slip system.
ng:checksum('00000000404066','fik')
Returns 3​

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