mbedtls/library/hkdf.c

2  *  HKDF implementation -- RFC 5869
5  *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
74     unsigned char t[MBEDTLS_MD_MAX_SIZE];  in mbedtls_hkdf_expand()  local
111     memset(t, 0, hash_len);  in mbedtls_hkdf_expand()
114      * Compute T = T(1) | T(2) | T(3) | ... | T(N)  in mbedtls_hkdf_expand()
115      * Where T(N) is defined in RFC 5869 Section 2.3  in mbedtls_hkdf_expand()
126         ret = mbedtls_md_hmac_update(&ctx, t, t_len);  in mbedtls_hkdf_expand()
136         /* The constant concatenated to the end of each T(n) is a single octet.  in mbedtls_hkdf_expand()
143         ret = mbedtls_md_hmac_finish(&ctx, t);  in mbedtls_hkdf_expand()
148         num_to_copy = i != n ? hash_len : okm_len - where;  in mbedtls_hkdf_expand()
149         memcpy(okm + where, t, num_to_copy);  in mbedtls_hkdf_expand()
156     mbedtls_platform_zeroize(t, sizeof(t));  in mbedtls_hkdf_expand()