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.Dd January 16, 2022
.Dt LIBMD 3LIB
.Os
.Sh NAME
.Nm libmd
.Nd Message Digest library
.Sh LIBRARY
.Lb libmd
.Sh SYNOPSIS
.In md4.h
.In md5.h
.In sha1.h
.In sha2.h
.In sys/edonr.h
.In sys/skein.h
.Sh DESCRIPTION
This library provides hashing routines for the following suites of hash
functions:
.Bl -bullet -offset indent -compact
.It
MD4
.Pq RFC1320
.It
MD5
.Pq RFC1321
.It
SHA1
.Pq RFC3174
.It
SHA256
.Pq FIPS 180-2
.It
SHA384
.Pq FIPS 180-2
.It
SHA512
.Pq FIPS 180-2
.It
Edon-R
.Po
.Rs
.%T Cryptographic hash function Edon-R
.Re
.Pc
.It
Skein 256, 512, and 1024
.Po
.Rs
.%T The Skein Hash Function Family
.Re
.Pc
.El
.Sh INTERFACES
The shared object
.Sy libmd.so.1
provides the public interfaces defined below.
See
.Xr Intro 3
for additional information on shared object interfaces.
.Bl -column -offset indent ".Sy Skein1024_Final_Pad" ".Sy Skein1024_Final_Pad"
.It Sy EdonRFinal Ta Sy EdonRHash
.It Sy EdonRInit Ta Sy EdonRUpdate
.It Sy MD4Final Ta Sy MD4Init
.It Sy MD4Update Ta Sy md5_calc
.It Sy MD5Final Ta Sy MD5Init
.It Sy MD5Update Ta Sy SHA1Final
.It Sy SHA1Init Ta Sy SHA1Update
.It Sy SHA2Final Ta Sy SHA2Init
.It Sy SHA2Update Ta Sy Skein_256_Final
.It Sy Skein_256_Final_Pad Ta Sy Skein_256_Init
.It Sy Skein_256_InitExt Ta Sy Skein_256_Output
.It Sy Skein_256_Update Ta Sy Skein_512_Final
.It Sy Skein_512_Final_Pad Ta Sy Skein_512_Init
.It Sy Skein_512_InitExt Ta Sy Skein_512_Output
.It Sy Skein_512_Update Ta Sy Skein1024_Final
.It Sy Skein1024_Final_Pad Ta Sy Skein1024_Init
.It Sy Skein1024_InitExt Ta Sy Skein1024_Output
.It Sy Skein1024_Update Ta ""
.El
.Sh SECURITY
The MD4 and MD5 algorithms are currently considered weak for cryptographic use.
The algorithms should be used only for compatibility with legacy systems or
protocols.
.Pp
The SHA1 algorithm is also believed to have some weaknesses.
Migration to one of the SHA2 algorithms \(em including SHA256, SHA386 or SHA512
\(em is highly recommended when data formats and on wire protocols support the
use of SHA2.
.Sh FILES
.Bl -tag -width Ds
.It Pa /lib/libmd.so.1
32-bit shared object
.It Pa /lib/64/libmd.so.1
64-bit shared object
.El
.Sh INTERFACE STABILITY
.Sy Committed
.Sh MT-LEVEL
.Sy MT-Safe