DESCRIPTION
The RIPEMD160_ functions calculate a 160-bit cryptographic checksum (digest) for any number of input bytes. A cryptographic checksum is a one-way hash function; that is, it is computationally impractical to find the input corresponding to a particular output. This net result is a "fingerprint" of the input-data, which does not disclose the actual input. The RIPEMD160_Init, RIPEMD160_Update, and RIPEMD160_Final functions are the core functions. Allocate an
.Vt RIPEMD160_CTX , initialize it with RIPEMD160_Init, run over the data with RIPEMD160_Update, and finally extract the result using RIPEMD160_Final.
The RIPEMD160_End function is a wrapper for RIPEMD160_Final which converts the return value to a 41-character (including the terminating ’\0’) ASCII string which represents the 160 bits in hexadecimal.
The RIPEMD160_File function calculates the digest of a file, and uses RIPEMD160_End to return the result. If the file cannot be opened, a null pointer is returned. The RIPEMD160_FileChunk function is similar to RIPEMD160_File, but it only calculates the digest over a byte-range of the file specified, starting at offset and spanning length bytes. If the length parameter is specified as 0, or more than the length of the remaining part of the file, RIPEMD160_FileChunk calculates the digest from offset to the end of file. The RIPEMD160_Data function calculates the digest of a chunk of data in memory, and uses RIPEMD160_End to return the result.
When using RIPEMD160_End, RIPEMD160_File, or RIPEMD160_Data, the buf argument can be a null pointer, in which case the returned string is allocated with malloc(3) and subsequently must be explicitly deallocated using free(3) after use. If the buf argument is non-null it must point to at least 41 characters of buffer space.
SEE ALSO
md2(3), md4(3), md5(3), sha(3)
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