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1.\" $OpenBSD: RIPEMD160.3,v 1.8 2024/05/26 09:54:16 tb Exp $
2.\" full merge up to: OpenSSL 72a7a702 Feb 26 14:05:09 2019 +0000
3.\"
4.\" This file was written by Ulf Moeller <ulf@openssl.org>.
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51.Dd $Mdocdate: May 26 2024 $
52.Dt RIPEMD160 3
53.Os
54.Sh NAME
55.Nm RIPEMD160 ,
56.Nm RIPEMD160_Init ,
57.Nm RIPEMD160_Update ,
58.Nm RIPEMD160_Final
59.Nd RIPEMD-160 hash function
60.Sh SYNOPSIS
61.In openssl/ripemd.h
62.Ft unsigned char *
63.Fo RIPEMD160
64.Fa "const unsigned char *d"
65.Fa "unsigned long n"
66.Fa "unsigned char *md"
67.Fc
68.Ft int
69.Fo RIPEMD160_Init
70.Fa "RIPEMD160_CTX *c"
71.Fc
72.Ft int
73.Fo RIPEMD160_Update
74.Fa "RIPEMD160_CTX *c"
75.Fa "const void *data"
76.Fa "unsigned long len"
77.Fc
78.Ft int
79.Fo RIPEMD160_Final
80.Fa "unsigned char *md"
81.Fa "RIPEMD160_CTX *c"
82.Fc
83.Sh DESCRIPTION
84RIPEMD-160 is a cryptographic hash function with a 160-bit output.
85.Pp
86.Fn RIPEMD160
87computes the RIPEMD-160 message digest of the
88.Fa n
89bytes at
90.Fa d
91and places it in
92.Fa md ,
93which must have space for
94.Dv RIPEMD160_DIGEST_LENGTH
95== 20 bytes of output.
96.Pp
97The following functions may be used if the message is not completely
98stored in memory:
99.Pp
100.Fn RIPEMD160_Init
101initializes a
102.Vt RIPEMD160_CTX
103structure.
104.Pp
105.Fn RIPEMD160_Update
106can be called repeatedly with chunks of the message to be hashed
107.Pq Fa len No bytes at Fa data .
108.Pp
109.Fn RIPEMD160_Final
110places the message digest in
111.Fa md ,
112which must have space for
113.Dv RIPEMD160_DIGEST_LENGTH
114== 20 bytes of output,
115and erases the
116.Vt RIPEMD160_CTX .
117.Pp
118Applications should use the higher level functions
119.Xr EVP_DigestInit 3
120etc. instead of calling the hash functions directly.
121.Sh RETURN VALUES
122.Fn RIPEMD160
123returns a pointer to the hash value.
124.Pp
125.Fn RIPEMD160_Init ,
126.Fn RIPEMD160_Update ,
127and
128.Fn RIPEMD160_Final
129return 1 for success or 0 otherwise.
130.Sh SEE ALSO
131.Xr EVP_DigestInit 3 ,
132.Xr HMAC 3
133.Sh STANDARDS
134.Bd -unfilled
135ISO/IEC 10118-3:2004/Cor 1:2011
136Hash-functions \(em Part 3: Dedicated hash-functions
137Clause 7: RIPEMD-160
138.Ed
139.Sh HISTORY
140.Fn RIPEMD160 ,
141.Fn RIPEMD160_Init ,
142.Fn RIPEMD160_Update ,
143and
144.Fn RIPEMD160_Final
145first appeared in SSLeay 0.9.0 and have been available since
146.Ox 2.4 .
147.Sh CAVEATS
148Other implementations allow
149.Fa md
150in
151.Fn RIPEMD160
152to be
153.Dv NULL
154and return a static array, which is not thread safe.
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