Hawkynt

MDC-2

Modification Detection Code 2, an ISO/IEC 10118-2 standard hash function based on DES encryption. Produces 128-bit hashes using Davies-Meyer construction.

Properties

Property	Value
Category	Hash Functions
Sub-category	Hash Function
Security status	⚠️ Deprecated
Complexity	Intermediate
Inventor	Brachtl, Coppersmith, Hyden, Matyas, Meyer, Oseas, Pilpel, Schilling
Year	1988
Origin	🇺🇸 United States
Source	algorithms/hash/mdc2.js

Parameters

Parameter	Supported values
Output sizes	16 bytes (128 bits)

Security

Status: ⚠️ Deprecated

No vulnerabilities are recorded for this implementation.

Documentation

• ISO/IEC 10118-2:2010 Standard
• OpenSSL MDC2 Documentation
• Research Paper on MDC-2

References

• MDC-2 in ISO Standards
• OpenSSL Implementation

Test vectors

2 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — OpenSSL Test Vector - ‘Now is the time for all ‘ (pad_type=2)

Field	Value
padType	2
input	4e6f77206973207468652074696d6520666f7220616c6c20
expected	2e4679b5add9ca7535d87afeab33bee2

Vector 2 — OpenSSL Test Vector - ‘Now is the time for all ‘ (pad_type=1, default)

Field	Value
padType	1
input	4e6f77206973207468652074696d6520666f7220616c6c20
expected	42e50cd224baceba760bdd2bd409281a

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