Crypto build cleanup: remove CONFIG_NO_PBKDF2

Instead of using a define and conditional building of sha1.c parts,
move the PBKDF2 implementation into a separate file.

hostapd/Makefile

@@ -38,7 +38,7 @@ CFLAGS += -DCONFIG_NATIVE_WINDOWS
 LIBS += -lws2_32
 endif
 
-SHA1OBJS = ../src/crypto/sha1.o
+SHA1OBJS = ../src/crypto/sha1.o ../src/crypto/sha1-pbkdf2.o
 
 OBJS =	hostapd.o main.o ieee802_1x.o eapol_sm.o \
 	config.o ieee802_11_auth.o \

src/crypto/sha1-pbkdf2.c

@@ -0,0 +1,91 @@
+/*
+ * SHA1-based key derivation function (PBKDF2) for IEEE 802.11i
+ * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "sha1.h"
+#include "md5.h"
+#include "crypto.h"
+
+static void pbkdf2_sha1_f(const char *passphrase, const char *ssid,
+			  size_t ssid_len, int iterations, unsigned int count,
+			  u8 *digest)
+{
+	unsigned char tmp[SHA1_MAC_LEN], tmp2[SHA1_MAC_LEN];
+	int i, j;
+	unsigned char count_buf[4];
+	const u8 *addr[2];
+	size_t len[2];
+	size_t passphrase_len = os_strlen(passphrase);
+
+	addr[0] = (u8 *) ssid;
+	len[0] = ssid_len;
+	addr[1] = count_buf;
+	len[1] = 4;
+
+	/* F(P, S, c, i) = U1 xor U2 xor ... Uc
+	 * U1 = PRF(P, S || i)
+	 * U2 = PRF(P, U1)
+	 * Uc = PRF(P, Uc-1)
+	 */
+
+	count_buf[0] = (count >> 24) & 0xff;
+	count_buf[1] = (count >> 16) & 0xff;
+	count_buf[2] = (count >> 8) & 0xff;
+	count_buf[3] = count & 0xff;
+	hmac_sha1_vector((u8 *) passphrase, passphrase_len, 2, addr, len, tmp);
+	os_memcpy(digest, tmp, SHA1_MAC_LEN);
+
+	for (i = 1; i < iterations; i++) {
+		hmac_sha1((u8 *) passphrase, passphrase_len, tmp, SHA1_MAC_LEN,
+			  tmp2);
+		os_memcpy(tmp, tmp2, SHA1_MAC_LEN);
+		for (j = 0; j < SHA1_MAC_LEN; j++)
+			digest[j] ^= tmp2[j];
+	}
+}
+
+
+/**
+ * pbkdf2_sha1 - SHA1-based key derivation function (PBKDF2) for IEEE 802.11i
+ * @passphrase: ASCII passphrase
+ * @ssid: SSID
+ * @ssid_len: SSID length in bytes
+ * @iterations: Number of iterations to run
+ * @buf: Buffer for the generated key
+ * @buflen: Length of the buffer in bytes
+ *
+ * This function is used to derive PSK for WPA-PSK. For this protocol,
+ * iterations is set to 4096 and buflen to 32. This function is described in
+ * IEEE Std 802.11-2004, Clause H.4. The main construction is from PKCS#5 v2.0.
+ */
+void pbkdf2_sha1(const char *passphrase, const char *ssid, size_t ssid_len,
+		 int iterations, u8 *buf, size_t buflen)
+{
+	unsigned int count = 0;
+	unsigned char *pos = buf;
+	size_t left = buflen, plen;
+	unsigned char digest[SHA1_MAC_LEN];
+
+	while (left > 0) {
+		count++;
+		pbkdf2_sha1_f(passphrase, ssid, ssid_len, iterations, count,
+			      digest);
+		plen = left > SHA1_MAC_LEN ? SHA1_MAC_LEN : left;
+		os_memcpy(pos, digest, plen);
+		pos += plen;
+		left -= plen;
+	}
+}

src/crypto/sha1.c

@@ -152,79 +152,3 @@ void sha1_prf(const u8 *key, size_t key_len, const char *label,
 		counter++;
 	}
 }
-
-
-#ifndef CONFIG_NO_PBKDF2
-
-static void pbkdf2_sha1_f(const char *passphrase, const char *ssid,
-			  size_t ssid_len, int iterations, unsigned int count,
-			  u8 *digest)
-{
-	unsigned char tmp[SHA1_MAC_LEN], tmp2[SHA1_MAC_LEN];
-	int i, j;
-	unsigned char count_buf[4];
-	const u8 *addr[2];
-	size_t len[2];
-	size_t passphrase_len = os_strlen(passphrase);
-
-	addr[0] = (u8 *) ssid;
-	len[0] = ssid_len;
-	addr[1] = count_buf;
-	len[1] = 4;
-
-	/* F(P, S, c, i) = U1 xor U2 xor ... Uc
-	 * U1 = PRF(P, S || i)
-	 * U2 = PRF(P, U1)
-	 * Uc = PRF(P, Uc-1)
-	 */
-
-	count_buf[0] = (count >> 24) & 0xff;
-	count_buf[1] = (count >> 16) & 0xff;
-	count_buf[2] = (count >> 8) & 0xff;
-	count_buf[3] = count & 0xff;
-	hmac_sha1_vector((u8 *) passphrase, passphrase_len, 2, addr, len, tmp);
-	os_memcpy(digest, tmp, SHA1_MAC_LEN);
-
-	for (i = 1; i < iterations; i++) {
-		hmac_sha1((u8 *) passphrase, passphrase_len, tmp, SHA1_MAC_LEN,
-			  tmp2);
-		os_memcpy(tmp, tmp2, SHA1_MAC_LEN);
-		for (j = 0; j < SHA1_MAC_LEN; j++)
-			digest[j] ^= tmp2[j];
-	}
-}
-
-
-/**
- * pbkdf2_sha1 - SHA1-based key derivation function (PBKDF2) for IEEE 802.11i
- * @passphrase: ASCII passphrase
- * @ssid: SSID
- * @ssid_len: SSID length in bytes
- * @iterations: Number of iterations to run
- * @buf: Buffer for the generated key
- * @buflen: Length of the buffer in bytes
- *
- * This function is used to derive PSK for WPA-PSK. For this protocol,
- * iterations is set to 4096 and buflen to 32. This function is described in
- * IEEE Std 802.11-2004, Clause H.4. The main construction is from PKCS#5 v2.0.
- */
-void pbkdf2_sha1(const char *passphrase, const char *ssid, size_t ssid_len,
-		 int iterations, u8 *buf, size_t buflen)
-{
-	unsigned int count = 0;
-	unsigned char *pos = buf;
-	size_t left = buflen, plen;
-	unsigned char digest[SHA1_MAC_LEN];
-
-	while (left > 0) {
-		count++;
-		pbkdf2_sha1_f(passphrase, ssid, ssid_len, iterations, count,
-			      digest);
-		plen = left > SHA1_MAC_LEN ? SHA1_MAC_LEN : left;
-		os_memcpy(pos, digest, plen);
-		pos += plen;
-		left -= plen;
-	}
-}
-
-#endif /* CONFIG_NO_PBKDF2 */

wpa_supplicant/Makefile

@@ -1066,8 +1066,8 @@ ifdef CONFIG_NO_WPA2
 CFLAGS += -DCONFIG_NO_WPA2
 endif
 
-ifdef CONFIG_NO_WPA_PASSPHRASE
-CFLAGS += -DCONFIG_NO_PBKDF2
+ifndef CONFIG_NO_WPA_PASSPHRASE
+SHA1OBJS += ../src/crypto/sha1-pbkdf2.o
 endif
 
 ifdef CONFIG_NO_AES_EXTRAS