Extend SHA-384 and SHA-512 support to match SHA-256

The additional SHA-384 and SHA-512 functionality is needed to support
DPP with various ECC curves.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

hostapd/Android.mk

@@ -859,6 +859,15 @@ endif
 ifdef NEED_TLS_PRF_SHA256
 OBJS += src/crypto/sha256-tlsprf.c
 endif
+ifdef NEED_HMAC_SHA256_KDF
+OBJS += src/crypto/sha256-kdf.c
+endif
+ifdef NEED_HMAC_SHA384_KDF
+OBJS += src/crypto/sha384-kdf.c
+endif
+ifdef NEED_HMAC_SHA512_KDF
+OBJS += src/crypto/sha512-kdf.c
+endif
 endif
 ifdef NEED_SHA384
 L_CFLAGS += -DCONFIG_SHA384
@@ -867,6 +876,15 @@ OBJS += src/crypto/sha384.c
 endif
 OBJS += src/crypto/sha384-prf.c
 endif
+ifdef NEED_SHA512
+L_CFLAGS += -DCONFIG_SHA512
+ifneq ($(CONFIG_TLS), openssl)
+ifneq ($(CONFIG_TLS), linux)
+OBJS += src/crypto/sha512.c
+endif
+endif
+OBJS += src/crypto/sha512-prf.c
+endif
 
 ifdef CONFIG_INTERNAL_SHA384
 L_CFLAGS += -DCONFIG_INTERNAL_SHA384

hostapd/Makefile

@@ -952,6 +952,12 @@ endif
 ifdef NEED_HMAC_SHA256_KDF
 OBJS += ../src/crypto/sha256-kdf.o
 endif
+ifdef NEED_HMAC_SHA384_KDF
+OBJS += ../src/crypto/sha384-kdf.o
+endif
+ifdef NEED_HMAC_SHA512_KDF
+OBJS += ../src/crypto/sha512-kdf.o
+endif
 endif
 ifdef NEED_SHA384
 CFLAGS += -DCONFIG_SHA384
@@ -962,6 +968,15 @@ endif
 endif
 OBJS += ../src/crypto/sha384-prf.o
 endif
+ifdef NEED_SHA512
+CFLAGS += -DCONFIG_SHA512
+ifneq ($(CONFIG_TLS), openssl)
+ifneq ($(CONFIG_TLS), linux)
+OBJS += ../src/crypto/sha512.o
+endif
+endif
+OBJS += ../src/crypto/sha512-prf.o
+endif
 
 ifdef CONFIG_INTERNAL_SHA384
 CFLAGS += -DCONFIG_INTERNAL_SHA384

src/crypto/crypto_openssl.c

@@ -246,6 +246,7 @@ int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len,
 }
 #endif /* NO_SHA256_WRAPPER */
 
+
 #ifndef NO_SHA384_WRAPPER
 int sha384_vector(size_t num_elem, const u8 *addr[], const size_t *len,
 		  u8 *mac)
@@ -255,6 +256,15 @@ int sha384_vector(size_t num_elem, const u8 *addr[], const size_t *len,
 #endif /* NO_SHA384_WRAPPER */
 
 
+#ifndef NO_SHA512_WRAPPER
+int sha512_vector(size_t num_elem, const u8 *addr[], const size_t *len,
+		  u8 *mac)
+{
+	return openssl_digest_vector(EVP_sha512(), num_elem, addr, len, mac);
+}
+#endif /* NO_SHA512_WRAPPER */
+
+
 static const EVP_CIPHER * aes_get_evp_cipher(size_t keylen)
 {
 	switch (keylen) {
@@ -1049,6 +1059,25 @@ int hmac_sha384(const u8 *key, size_t key_len, const u8 *data,
 #endif /* CONFIG_SHA384 */
 
 
+#ifdef CONFIG_SHA512
+
+int hmac_sha512_vector(const u8 *key, size_t key_len, size_t num_elem,
+		       const u8 *addr[], const size_t *len, u8 *mac)
+{
+	return openssl_hmac_vector(EVP_sha512(), key, key_len, num_elem, addr,
+				   len, mac, 64);
+}
+
+
+int hmac_sha512(const u8 *key, size_t key_len, const u8 *data,
+		size_t data_len, u8 *mac)
+{
+	return hmac_sha512_vector(key, key_len, 1, &data, &data_len, mac);
+}
+
+#endif /* CONFIG_SHA512 */
+
+
 int crypto_get_random(void *buf, size_t len)
 {
 	if (RAND_bytes(buf, len) != 1)

src/crypto/sha384-kdf.c

@@ -0,0 +1,87 @@
+/*
+ * HMAC-SHA384 KDF (RFC 5295) and HKDF-Expand(SHA384) (RFC 5869)
+ * Copyright (c) 2014-2017, 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 "sha384.h"
+
+
+/**
+ * hmac_sha384_kdf - HMAC-SHA384 based KDF (RFC 5295)
+ * @secret: Key for KDF
+ * @secret_len: Length of the key in bytes
+ * @label: A unique label for each purpose of the KDF or %NULL to select
+ *	RFC 5869 HKDF-Expand() with arbitrary seed (= info)
+ * @seed: Seed value to bind into the key
+ * @seed_len: Length of the seed
+ * @out: Buffer for the generated pseudo-random key
+ * @outlen: 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 in ERP. This KDF is defined in RFC 5295, Chapter 3.1.2. When used
+ * with label = NULL and seed = info, this matches HKDF-Expand() defined in
+ * RFC 5869, Chapter 2.3.
+ */
+int hmac_sha384_kdf(const u8 *secret, size_t secret_len,
+		    const char *label, const u8 *seed, size_t seed_len,
+		    u8 *out, size_t outlen)
+{
+	u8 T[SHA384_MAC_LEN];
+	u8 iter = 1;
+	const unsigned char *addr[4];
+	size_t len[4];
+	size_t pos, clen;
+
+	addr[0] = T;
+	len[0] = SHA384_MAC_LEN;
+	if (label) {
+		addr[1] = (const unsigned char *) label;
+		len[1] = os_strlen(label) + 1;
+	} else {
+		addr[1] = (const u8 *) "";
+		len[1] = 0;
+	}
+	addr[2] = seed;
+	len[2] = seed_len;
+	addr[3] = &iter;
+	len[3] = 1;
+
+	if (hmac_sha384_vector(secret, secret_len, 3, &addr[1], &len[1], T) < 0)
+		return -1;
+
+	pos = 0;
+	for (;;) {
+		clen = outlen - pos;
+		if (clen > SHA384_MAC_LEN)
+			clen = SHA384_MAC_LEN;
+		os_memcpy(out + pos, T, clen);
+		pos += clen;
+
+		if (pos == outlen)
+			break;
+
+		if (iter == 255) {
+			os_memset(out, 0, outlen);
+			os_memset(T, 0, SHA384_MAC_LEN);
+			return -1;
+		}
+		iter++;
+
+		if (hmac_sha384_vector(secret, secret_len, 4, addr, len, T) < 0)
+		{
+			os_memset(out, 0, outlen);
+			os_memset(T, 0, SHA384_MAC_LEN);
+			return -1;
+		}
+	}
+
+	os_memset(T, 0, SHA384_MAC_LEN);
+	return 0;
+}

src/crypto/sha384.h

@@ -20,5 +20,8 @@ int sha384_prf(const u8 *key, size_t key_len, const char *label,
 int sha384_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);
+int hmac_sha384_kdf(const u8 *secret, size_t secret_len,
+		    const char *label, const u8 *seed, size_t seed_len,
+		    u8 *out, size_t outlen);
 
 #endif /* SHA384_H */

src/crypto/sha512-kdf.c

@@ -0,0 +1,87 @@
+/*
+ * HMAC-SHA512 KDF (RFC 5295) and HKDF-Expand(SHA512) (RFC 5869)
+ * Copyright (c) 2014-2017, 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 "sha512.h"
+
+
+/**
+ * hmac_sha512_kdf - HMAC-SHA512 based KDF (RFC 5295)
+ * @secret: Key for KDF
+ * @secret_len: Length of the key in bytes
+ * @label: A unique label for each purpose of the KDF or %NULL to select
+ *	RFC 5869 HKDF-Expand() with arbitrary seed (= info)
+ * @seed: Seed value to bind into the key
+ * @seed_len: Length of the seed
+ * @out: Buffer for the generated pseudo-random key
+ * @outlen: 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 in ERP. This KDF is defined in RFC 5295, Chapter 3.1.2. When used
+ * with label = NULL and seed = info, this matches HKDF-Expand() defined in
+ * RFC 5869, Chapter 2.3.
+ */
+int hmac_sha512_kdf(const u8 *secret, size_t secret_len,
+		    const char *label, const u8 *seed, size_t seed_len,
+		    u8 *out, size_t outlen)
+{
+	u8 T[SHA512_MAC_LEN];
+	u8 iter = 1;
+	const unsigned char *addr[4];
+	size_t len[4];
+	size_t pos, clen;
+
+	addr[0] = T;
+	len[0] = SHA512_MAC_LEN;
+	if (label) {
+		addr[1] = (const unsigned char *) label;
+		len[1] = os_strlen(label) + 1;
+	} else {
+		addr[1] = (const u8 *) "";
+		len[1] = 0;
+	}
+	addr[2] = seed;
+	len[2] = seed_len;
+	addr[3] = &iter;
+	len[3] = 1;
+
+	if (hmac_sha512_vector(secret, secret_len, 3, &addr[1], &len[1], T) < 0)
+		return -1;
+
+	pos = 0;
+	for (;;) {
+		clen = outlen - pos;
+		if (clen > SHA512_MAC_LEN)
+			clen = SHA512_MAC_LEN;
+		os_memcpy(out + pos, T, clen);
+		pos += clen;
+
+		if (pos == outlen)
+			break;
+
+		if (iter == 255) {
+			os_memset(out, 0, outlen);
+			os_memset(T, 0, SHA512_MAC_LEN);
+			return -1;
+		}
+		iter++;
+
+		if (hmac_sha512_vector(secret, secret_len, 4, addr, len, T) < 0)
+		{
+			os_memset(out, 0, outlen);
+			os_memset(T, 0, SHA512_MAC_LEN);
+			return -1;
+		}
+	}
+
+	os_memset(T, 0, SHA512_MAC_LEN);
+	return 0;
+}

src/crypto/sha512-prf.c

@@ -0,0 +1,108 @@
+/*
+ * SHA512-based KDF (IEEE 802.11ac)
+ * Copyright (c) 2003-2017, 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 "sha512.h"
+#include "crypto.h"
+
+
+/**
+ * sha512_prf - SHA512-based Key derivation function (IEEE 802.11ac, 11.6.1.7.2)
+ * @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 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 sha512_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 sha512_prf_bits(key, key_len, label, data, data_len, buf,
+			       buf_len * 8);
+}
+
+
+/**
+ * sha512_prf_bits - IEEE Std 802.11ac-2013, 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 sha512_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[SHA512_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 >= SHA512_MAC_LEN) {
+			if (hmac_sha512_vector(key, key_len, 4, addr, len,
+					       &buf[pos]) < 0)
+				return -1;
+			pos += SHA512_MAC_LEN;
+		} else {
+			if (hmac_sha512_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;
+	}
+
+	os_memset(hash, 0, sizeof(hash));
+
+	return 0;
+}

src/crypto/sha512.h

@@ -0,0 +1,27 @@
+/*
+ * SHA512 hash implementation and interface functions
+ * Copyright (c) 2015-2017, Jouni Malinen <j@w1.fi>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#ifndef SHA512_H
+#define SHA512_H
+
+#define SHA512_MAC_LEN 64
+
+int hmac_sha512_vector(const u8 *key, size_t key_len, size_t num_elem,
+		       const u8 *addr[], const size_t *len, u8 *mac);
+int hmac_sha512(const u8 *key, size_t key_len, const u8 *data,
+		size_t data_len, u8 *mac);
+int sha512_prf(const u8 *key, size_t key_len, const char *label,
+	       const u8 *data, size_t data_len, u8 *buf, size_t buf_len);
+int sha512_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);
+int hmac_sha512_kdf(const u8 *secret, size_t secret_len,
+		    const char *label, const u8 *seed, size_t seed_len,
+		    u8 *out, size_t outlen);
+
+#endif /* SHA512_H */

wpa_supplicant/Android.mk

@@ -1306,6 +1306,14 @@ ifdef NEED_HMAC_SHA256_KDF
 L_CFLAGS += -DCONFIG_HMAC_SHA256_KDF
 SHA256OBJS += src/crypto/sha256-kdf.c
 endif
+ifdef NEED_HMAC_SHA384_KDF
+L_CFLAGS += -DCONFIG_HMAC_SHA384_KDF
+SHA256OBJS += src/crypto/sha384-kdf.c
+endif
+ifdef NEED_HMAC_SHA512_KDF
+L_CFLAGS += -DCONFIG_HMAC_SHA512_KDF
+SHA256OBJS += src/crypto/sha512-kdf.c
+endif
 OBJS += $(SHA256OBJS)
 endif
 ifdef NEED_SHA384
@@ -1315,6 +1323,13 @@ OBJS += src/crypto/sha384.c
 endif
 OBJS += src/crypto/sha384-prf.c
 endif
+ifdef NEED_SHA512
+L_CFLAGS += -DCONFIG_SHA512
+ifneq ($(CONFIG_TLS), openssl)
+OBJS += src/crypto/sha512.c
+endif
+OBJS += src/crypto/sha512-prf.c
+endif
 
 ifdef NEED_DH_GROUPS
 OBJS += src/crypto/dh_groups.c

wpa_supplicant/Makefile

@@ -1403,6 +1403,14 @@ ifdef NEED_HMAC_SHA256_KDF
 CFLAGS += -DCONFIG_HMAC_SHA256_KDF
 OBJS += ../src/crypto/sha256-kdf.o
 endif
+ifdef NEED_HMAC_SHA384_KDF
+CFLAGS += -DCONFIG_HMAC_SHA384_KDF
+OBJS += ../src/crypto/sha384-kdf.o
+endif
+ifdef NEED_HMAC_SHA512_KDF
+CFLAGS += -DCONFIG_HMAC_SHA512_KDF
+OBJS += ../src/crypto/sha512-kdf.o
+endif
 OBJS += $(SHA256OBJS)
 endif
 ifdef NEED_SHA384
@@ -1414,6 +1422,15 @@ endif
 CFLAGS += -DCONFIG_SHA384
 OBJS += ../src/crypto/sha384-prf.o
 endif
+ifdef NEED_SHA512
+ifneq ($(CONFIG_TLS), openssl)
+ifneq ($(CONFIG_TLS), linux)
+OBJS += ../src/crypto/sha512.o
+endif
+endif
+CFLAGS += -DCONFIG_SHA512
+OBJS += ../src/crypto/sha512-prf.o
+endif
 
 ifdef NEED_DH_GROUPS
 OBJS += ../src/crypto/dh_groups.o