_MD5$

The _MD5$ function returns the MD5 hash value of any arbitrary string.

Syntax

md5hash$ = _MD5$(dataString$)

Parameters

• md5hash$ is the hash value returned as hexadecimal STRING, if the given dataString$ was empty the unusual but absolutely correct hash value is:
  • D41D8CD98F00B204E9800998ECF8427E
• dataString$ is any literal or variable STRING to build the hash value from.

Description

• MD5 can be used as a checksum to verify data integrity against unintentional corruption.
• Historically it was widely used as a cryptographic hash function, however it has been found to suffer from extensive vulnerabilities.
• It remains suitable for other non-cryptographic purposes and may be preferred due to lower computational requirements than more recent Secure Hash Algorithms.

Availability

• 

  none

• 

  v3.12.0

• 
• 

  yes

• 

  yes

• 

  yes

Examples

Example

Showing how the MD5 hash value can detect differences in two strings.

'this is the correct text t$ = "QB64 Phoenix Edition" PRINT "Correct Text: "; t$ PRINT " MD5 hash: "; _MD5$(t$) PRINT 'this text differs in just 1 bit from the above, by changing 4 to 5 'ASC("4") = 52 = &B00110100 'ASC("5") = 53 = &B00110101 t$ = "QB65 Phoenix Edition" PRINT "Mangled Text: "; t$ PRINT " MD5 hash: "; _MD5$(t$) END

Example by RhoSigma

Correct Text: QB64 Phoenix Edition MD5 hash: E512ECA19E9487D7C2F564E848314238 Mangled Text: QB65 Phoenix Edition MD5 hash: 3EF03E7B0DB46F7D1FA6B9626563C10B

See also

• Featured in our "Keyword of the Day" series
• _DEFLATE$, _INFLATE$
• _ADLER32, _CRC32

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