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📄 aes-cbc.c(1.93 KB)
📄 aes-ccm.c(4.92 KB)
📄 aes-ctr.c(1.64 KB)
📄 aes-eax.c(3.24 KB)
📄 aes-encblock.c(704 B)
📄 aes-gcm.c(6.47 KB)
📄 aes-internal-dec.c(3.64 KB)
📄 aes-internal-enc.c(2.66 KB)
📄 aes-internal.c(41.23 KB)
📄 aes-omac1.c(4.46 KB)
📄 aes-siv.c(4.06 KB)
📄 aes-unwrap.c(1.78 KB)
📄 aes-wrap.c(1.62 KB)
📄 aes.h(548 B)
📄 aes_i.h(4.16 KB)
📄 aes_siv.h(565 B)
📄 aes_wrap.h(2.91 KB)
📄 crypto.h(28.61 KB)
📄 crypto_gnutls.c(11.42 KB)
📄 crypto_internal-cipher.c(5.08 KB)
📄 crypto_internal-modexp.c(2.95 KB)
📄 crypto_internal-rsa.c(2.81 KB)
📄 crypto_internal.c(6.84 KB)
📄 crypto_libtomcrypt.c(15.07 KB)
📄 crypto_linux.c(21.77 KB)
📄 crypto_module_tests.c(61.19 KB)
📄 crypto_nettle.c(9.7 KB)
📄 crypto_none.c(461 B)
📄 crypto_openssl.c(44.34 KB)
📄 crypto_wolfssl.c(33.91 KB)
📄 des-internal.c(14.83 KB)
📄 des_i.h(709 B)
📄 dh_group5.c(806 B)
📄 dh_group5.h(556 B)
📄 dh_groups.c(54.26 KB)
📄 dh_groups.h(692 B)
📄 fips_prf_internal.c(1.37 KB)
📄 fips_prf_openssl.c(2.05 KB)
📄 fips_prf_wolfssl.c(1.75 KB)
📄 md4-internal.c(7.91 KB)
📄 md5-internal.c(8.79 KB)
📄 md5.c(2.64 KB)
📄 md5.h(505 B)
📄 md5_i.h(516 B)
📄 milenage.c(9.5 KB)
📄 milenage.h(1019 B)
📄 ms_funcs.c(16.16 KB)
📄 ms_funcs.h(2.41 KB)
📄 random.c(11.66 KB)
📄 random.h(855 B)
📄 rc4.c(1009 B)
📄 sha1-internal.c(8.93 KB)
📄 sha1-pbkdf2.c(2.34 KB)
📄 sha1-prf.c(1.58 KB)
📄 sha1-tlsprf.c(2.69 KB)
📄 sha1-tprf.c(1.75 KB)
📄 sha1.c(2.69 KB)
📄 sha1.h(1.03 KB)
📄 sha1_i.h(590 B)
📄 sha256-internal.c(6 KB)
📄 sha256-kdf.c(2.08 KB)
📄 sha256-prf.c(2.84 KB)
📄 sha256-tlsprf.c(1.81 KB)
📄 sha256.c(2.64 KB)
📄 sha256.h(1.07 KB)
📄 sha256_i.h(584 B)
📄 sha384-internal.c(2.17 KB)
📄 sha384-kdf.c(2.08 KB)
📄 sha384-prf.c(2.85 KB)
📄 sha384.c(2.63 KB)
📄 sha384.h(949 B)
📄 sha384_i.h(573 B)
📄 sha512-internal.c(7.71 KB)
📄 sha512-kdf.c(2.08 KB)
📄 sha512-prf.c(2.85 KB)
📄 sha512.c(2.63 KB)
📄 sha512.h(949 B)
📄 sha512_i.h(591 B)
📄 tls.h(23.71 KB)
📄 tls_gnutls.c(44.97 KB)
📄 tls_internal.c(18.93 KB)
📄 tls_none.c(3.9 KB)
📄 tls_openssl.c(137.99 KB)
📄 tls_openssl.h(477 B)
📄 tls_openssl_ocsp.c(20.52 KB)
📄 tls_wolfssl.c(51.88 KB)

Editing: sha256-prf.c

/*
 * SHA256-based PRF (IEEE 802.11r)
 * Copyright (c) 2003-2016, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "includes.h"

#include "common.h"
#include "sha256.h"
#include "crypto.h"

/**
 * sha256_prf - SHA256-based Pseudo-Random Function (IEEE 802.11r, 8.5.1.5.2)
 * @key: Key for PRF
 * @key_len: Length of the key in bytes
 * @label: A unique label for each purpose of the PRF
 * @data: Extra data to bind into the key
 * @data_len: Length of the data
 * @buf: Buffer for the generated pseudo-random key
 * @buf_len: Number of bytes of key to generate
 * Returns: 0 on success, -1 on failure
 *
 * This function is used to derive new, cryptographically separate keys from a
 * given key.
 */
int sha256_prf(const u8 *key, size_t key_len, const char *label,
		const u8 *data, size_t data_len, u8 *buf, size_t buf_len)
{
	return sha256_prf_bits(key, key_len, label, data, data_len, buf,
			       buf_len * 8);
}

/**
 * sha256_prf_bits - IEEE Std 802.11-2012, 11.6.1.7.2 Key derivation function
 * @key: Key for KDF
 * @key_len: Length of the key in bytes
 * @label: A unique label for each purpose of the PRF
 * @data: Extra data to bind into the key
 * @data_len: Length of the data
 * @buf: Buffer for the generated pseudo-random key
 * @buf_len: Number of bits of key to generate
 * Returns: 0 on success, -1 on failure
 *
 * This function is used to derive new, cryptographically separate keys from a
 * given key. If the requested buf_len is not divisible by eight, the least
 * significant 1-7 bits of the last octet in the output are not part of the
 * requested output.
 */
int sha256_prf_bits(const u8 *key, size_t key_len, const char *label,
		    const u8 *data, size_t data_len, u8 *buf,
		    size_t buf_len_bits)
{
	u16 counter = 1;
	size_t pos, plen;
	u8 hash[SHA256_MAC_LEN];
	const u8 *addr[4];
	size_t len[4];
	u8 counter_le[2], length_le[2];
	size_t buf_len = (buf_len_bits + 7) / 8;

addr[0] = counter_le;
	len[0] = 2;
	addr[1] = (u8 *) label;
	len[1] = os_strlen(label);
	addr[2] = data;
	len[2] = data_len;
	addr[3] = length_le;
	len[3] = sizeof(length_le);

WPA_PUT_LE16(length_le, buf_len_bits);
	pos = 0;
	while (pos < buf_len) {
		plen = buf_len - pos;
		WPA_PUT_LE16(counter_le, counter);
		if (plen >= SHA256_MAC_LEN) {
			if (hmac_sha256_vector(key, key_len, 4, addr, len,
					       &buf[pos]) < 0)
				return -1;
			pos += SHA256_MAC_LEN;
		} else {
			if (hmac_sha256_vector(key, key_len, 4, addr, len,
					       hash) < 0)
				return -1;
			os_memcpy(&buf[pos], hash, plen);
			pos += plen;
			break;
		}
		counter++;
	}

/*
	 * Mask out unused bits in the last octet if it does not use all the
	 * bits.
	 */
	if (buf_len_bits % 8) {
		u8 mask = 0xff << (8 - buf_len_bits % 8);
		buf[pos - 1] &= mask;
	}

forced_memzero(hash, sizeof(hash));

return 0;
}

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Editing: sha256-prf.c

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