kcapi_kdf_dpi - Double Pipeline Mode Key Derivation Function

handle
           [in] cipher handle allocated by caller. This cipher handle must be allocated with kcapi_md_init. If
           the caller is interested in a KDF using a keyed message digest, the caller should also call
           kcapi_md_setkey before invoking this function.

       src
           [in] Input data that should be transformed into a key (see below).

       slen
           [in] Length of the src input data.

       dst
           [out] Buffer to store the generated key in,

       dlen
           [in] Length of the dst buffer. This value defines the number of bytes generated by the KDF.

StephanMueller <smueller@chronox.de>
           Author.

libkcapi Manual 1.5.0                              April 2024                                   KCAPI_KDF_DPI(3)

       This function is an implementation of the KDF in double pipeline iteration mode according with counter to
       SP800-108 section 5.3.

       The caller must provide Label || 0x00 || Context in src. This src pointer may also be NULL if the caller
       wishes not to provide anything.

       return 0 upon success; a negative errno-style error code if an error occurred

       kcapi_kdf_dpi - Double Pipeline Mode Key Derivation Function

ssize_tkcapi_kdf_dpi(structkcapi_handle*handle,constuint8_t*src,size_tslen,uint8_t*dst,size_tdlen);