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1.\" $OpenBSD: MD5.3,v 1.9 2024/05/26 09:54:16 tb Exp $
2.\" OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
3.\"
4.\" This file was written by Ulf Moeller <ulf@openssl.org> and
5.\" Richard Levitte <levitte@openssl.org>.
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52.Dd $Mdocdate: May 26 2024 $
53.Dt MD5 3
54.Os
55.Sh NAME
56.Nm MD4 ,
57.Nm MD5 ,
58.Nm MD4_Init ,
59.Nm MD4_Update ,
60.Nm MD4_Final ,
61.Nm MD5_Init ,
62.Nm MD5_Update ,
63.Nm MD5_Final
64.Nd MD4 and MD5 hash functions
65.Sh SYNOPSIS
66.In openssl/md4.h
67.Ft unsigned char *
68.Fo MD4
69.Fa "const unsigned char *d"
70.Fa "unsigned long n"
71.Fa "unsigned char *md"
72.Fc
73.Ft int
74.Fo MD4_Init
75.Fa "MD4_CTX *c"
76.Fc
77.Ft int
78.Fo MD4_Update
79.Fa "MD4_CTX *c"
80.Fa "const void *data"
81.Fa "unsigned long len"
82.Fc
83.Ft int
84.Fo MD4_Final
85.Fa "unsigned char *md"
86.Fa "MD4_CTX *c"
87.Fc
88.In openssl/md5.h
89.Ft unsigned char *
90.Fo MD5
91.Fa "const unsigned char *d"
92.Fa "unsigned long n"
93.Fa "unsigned char *md"
94.Fc
95.Ft int
96.Fo MD5_Init
97.Fa "MD5_CTX *c"
98.Fc
99.Ft int
100.Fo MD5_Update
101.Fa "MD5_CTX *c"
102.Fa "const void *data"
103.Fa "unsigned long len"
104.Fc
105.Ft int
106.Fo MD5_Final
107.Fa "unsigned char *md"
108.Fa "MD5_CTX *c"
109.Fc
110.Sh DESCRIPTION
111MD4 and MD5 are cryptographic hash functions with a 128-bit
112output.
113.Pp
114.Fn MD4
115and
116.Fn MD5
117compute the MD4 and MD5 message digest of the
118.Fa n
119bytes at
120.Fa d
121and place it in
122.Fa md ,
123which must have space for
124.Dv MD4_DIGEST_LENGTH No == Dv MD5_DIGEST_LENGTH No == 16
125bytes of output.
126.Pp
127The following functions may be used if the message is not completely
128stored in memory:
129.Pp
130.Fn MD5_Init
131initializes a
132.Vt MD5_CTX
133structure.
134.Pp
135.Fn MD5_Update
136can be called repeatedly with chunks of the message to be hashed
137.Pq Fa len No bytes at Fa data .
138.Pp
139.Fn MD5_Final
140places the message digest in
141.Fa md ,
142which must have space for
143.Dv MD5_DIGEST_LENGTH No == 16
144bytes of output, and erases the
145.Vt MD5_CTX .
146.Pp
147.Fn MD4_Init ,
148.Fn MD4_Update ,
149and
150.Fn MD4_Final
151are analogous using an
152.Vt MD4_CTX
153structure.
154.Pp
155Applications should use the higher level functions
156.Xr EVP_DigestInit 3
157etc. instead of calling these hash functions directly.
158.Sh RETURN VALUES
159.Fn MD4
160and
161.Fn MD5
162return pointers to the hash value.
163.Pp
164.Fn MD4_Init ,
165.Fn MD4_Update ,
166.Fn MD4_Final ,
167.Fn MD5_Init ,
168.Fn MD5_Update ,
169and
170.Fn MD5_Final
171return 1 for success or 0 otherwise.
172.Sh SEE ALSO
173.Xr EVP_DigestInit 3
174.Sh STANDARDS
175RFC 1320, RFC 1321
176.Sh HISTORY
177.Fn MD5 ,
178.Fn MD5_Init ,
179.Fn MD5_Update ,
180and
181.Fn MD5_Final
182appeared in SSLeay 0.4 or earlier and have been available since
183.Ox 2.4 .
184.Pp
185.Fn MD4 ,
186.Fn MD4_Init ,
187.Fn MD4_Update ,
188and
189.Fn MD4_Final
190first appeared in OpenSSL 0.9.6 and have been available since
191.Ox 2.9 .
192.Sh CAVEATS
193Other implementations allow
194.Fa md
195in
196.Fn MD4
197and
198.Fn MD5
199to be
200.Dv NULL
201and return a static array, which is not thread safe.
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