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RIPEMD160(3) Library Functions Manual RIPEMD160(3)

RIPEMD160, RIPEMD160_Init, RIPEMD160_Update, RIPEMD160_Final
RIPEMD-160 hash function

#include <openssl/ripemd.h>
unsigned char *
RIPEMD160(const unsigned char *d, unsigned long n, unsigned char *md);
RIPEMD160_Init(RIPEMD160_CTX *c);
RIPEMD160_Update(RIPEMD_CTX *c, const void *data, unsigned long len);
RIPEMD160_Final(unsigned char *md, RIPEMD160_CTX *c);

RIPEMD-160 is a cryptographic hash function with a 160-bit output.
RIPEMD160() computes the RIPEMD-160 message digest of the n bytes at d and places it in md, which must have space for RIPEMD160_DIGEST_LENGTH == 20 bytes of output. If md is NULL, the digest is placed in a static array.
The following functions may be used if the message is not completely stored in memory:
RIPEMD160_Init() initializes a RIPEMD160_CTX structure.
RIPEMD160_Update() can be called repeatedly with chunks of the message to be hashed (len bytes at data).
RIPEMD160_Final() places the message digest in md, which must have space for RIPEMD160_DIGEST_LENGTH == 20 bytes of output, and erases the RIPEMD160_CTX.
Applications should use the higher level functions EVP_DigestInit(3) etc. instead of calling the hash functions directly.

RIPEMD160() returns a pointer to the hash value.
RIPEMD160_Init(), RIPEMD160_Update(), and RIPEMD160_Final() return 1 for success or 0 otherwise.

EVP_DigestInit(3), HMAC(3)

ISO/IEC 10118-3:2004/Cor 1:2011 
Hash-functions — Part 3: Dedicated hash-functions 
Clause 7: RIPEMD-160

RIPEMD160(), RIPEMD160_Init(), RIPEMD160_Update(), and RIPEMD160_Final() first appeared in SSLeay 0.9.0 and have been available since OpenBSD 2.4.
March 21, 2018 OpenBSD-current