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+.Dd $Mdocdate: November 5 2016 $
+.Dt RIPEMD160 3
+.Os
+.Sh NAME
+.Nm RIPEMD160 ,
+.Nm RIPEMD160_Init ,
+.Nm RIPEMD160_Update ,
+.Nm RIPEMD160_Final
+.Nd RIPEMD-160 hash function
+.Sh SYNOPSIS
+.In openssl/ripemd.h
+.Ft unsigned char *
+.Fo RIPEMD160
+.Fa "const unsigned char *d"
+.Fa "unsigned long n"
+.Fa "unsigned char *md"
+.Fc
+.Ft int
+.Fo RIPEMD160_Init
+.Fa "RIPEMD160_CTX *c"
+.Fc
+.Ft int
+.Fo RIPEMD160_Update
+.Fa "RIPEMD_CTX *c"
+.Fa "const void *data"
+.Fa "unsigned long len"
+.Fc
+.Ft int
+.Fo RIPEMD160_Final
+.Fa "unsigned char *md"
+.Fa "RIPEMD160_CTX *c"
+.Fc
+.Sh DESCRIPTION
+RIPEMD-160 is a cryptographic hash function with a 160 bit output.
+.Pp
+.Fn RIPEMD160
+computes the RIPEMD-160 message digest of the
+.Fa n
+bytes at
+.Fa d
+and places it in
+.Fa md ,
+which must have space for
+.Dv RIPEMD160_DIGEST_LENGTH
+== 20 bytes of output.
+If
+.Fa md
+is
+.Dv NULL ,
+the digest is placed in a static array.
+.Pp
+The following functions may be used if the message is not completely
+stored in memory:
+.Pp
+.Fn RIPEMD160_Init
+initializes a
+.Vt RIPEMD160_CTX
+structure.
+.Pp
+.Fn RIPEMD160_Update
+can be called repeatedly with chunks of the message to be hashed
+.Pq Fa len No bytes at Fa data .
+.Pp
+.Fn RIPEMD160_Final
+places the message digest in
+.Fa md ,
+which must have space for
+.Dv RIPEMD160_DIGEST_LENGTH
+== 20 bytes of output,
+and erases the
+.Vt RIPEMD160_CTX .
+.Pp
+Applications should use the higher level functions
+.Xr EVP_DigestInit 3
+etc. instead of calling the hash functions directly.
+.Sh RETURN VALUES
+.Fn RIPEMD160
+returns a pointer to the hash value.
+.Pp
+.Fn RIPEMD160_Init ,
+.Fn RIPEMD160_Update ,
+and
+.Fn RIPEMD160_Final
+return 1 for success or 0 otherwise.
+.Sh SEE ALSO
+.Xr EVP_DigestInit 3 ,
+.Xr HMAC 3
+.Sh STANDARDS
+ISO/IEC 10118-3 (draft) (??)
+.Sh HISTORY
+.Fn RIPEMD160 ,
+.Fn RIPEMD160_Init ,
+.Fn RIPEMD160_Update ,
+and
+.Fn RIPEMD160_Final
+are available since SSLeay 0.9.0.