implementations/kdfs/hkdf.c

49 static int HKDF(OSSL_LIB_CTX *libctx, const EVP_MD *evp_md,
63 /* Settable context parameters that are common across HKDF and the TLS KDF */
176         return HKDF(libctx, md, ctx->salt, ctx->salt_len,
379  * Refer to "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)"
381  * "Cryptographic Extraction and Key Derivation: The HKDF Scheme"
385  *   The scheme HKDF is specified as:
386  *     HKDF(XTS, SKM, CTXinfo, L) = K(1) | K(2) | ... | K(t)
399  *     HKDF-Extract(salt, IKM) -> PRK
401  *     HKDF-Expand(PRK, info, L) -> OKM
403 static int HKDF(OSSL_LIB_CTX *libctx, const EVP_MD *evp_md,
418     /* Step 1: HKDF-Extract(salt, IKM) -> PRK */
423     /* Step 2: HKDF-Expand(PRK, info, L) -> OKM */
431  * Refer to "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)"
436  *   HKDF-Extract(salt, IKM) -> PRK
475  * Refer to "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)"
480  *   HKDF-Expand(PRK, info, L) -> OKM