[pulseaudio-discuss] [PATCH v6 14/37] raop: Add a MD5 hashing fuction
Hajime Fujita
crisp.fujita at gmail.com
Sun Jan 31 20:16:11 PST 2016
From: Martin Blanchard <tchaik at gmx.com>
MD5 hashing will be needed during the authentication process. Base64 and
MD5 code is now in a commun file called raop_util.c. Old Base64 files are
removed but copyright is preserved.
---
src/Makefile.am | 4 +-
src/modules/raop/base64.c | 136 ---------------------------------
src/modules/raop/base64.h | 32 --------
src/modules/raop/raop_client.c | 6 +-
src/modules/raop/raop_crypto.c | 10 +--
src/modules/raop/raop_util.c | 170 +++++++++++++++++++++++++++++++++++++++++
src/modules/raop/raop_util.h | 28 +++++++
7 files changed, 208 insertions(+), 178 deletions(-)
delete mode 100644 src/modules/raop/base64.c
delete mode 100644 src/modules/raop/base64.h
create mode 100644 src/modules/raop/raop_util.c
create mode 100644 src/modules/raop/raop_util.h
diff --git a/src/Makefile.am b/src/Makefile.am
index e5b9131..9a1e1cf 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1133,9 +1133,9 @@ librtp_la_LIBADD = $(AM_LIBADD) libpulsecore- at PA_MAJORMINOR@.la libpulsecommon-@
libraop_la_SOURCES = \
modules/raop/raop_client.c modules/raop/raop_client.h \
+ modules/raop/raop_packet_buffer.h modules/raop/raop_packet_buffer.c \
modules/raop/raop_crypto.c modules/raop/raop_crypto.h \
- modules/raop/base64.c modules/raop/base64.h \
- modules/raop/raop_packet_buffer.h modules/raop/raop_packet_buffer.c
+ modules/raop/raop_util.c modules/raop/raop_util.h
libraop_la_CFLAGS = $(AM_CFLAGS) $(OPENSSL_CFLAGS) -I$(top_srcdir)/src/modules/rtp
libraop_la_LDFLAGS = $(AM_LDFLAGS) $(AM_LIBLDFLAGS) -avoid-version
libraop_la_LIBADD = $(AM_LIBADD) $(OPENSSL_LIBS) libpulsecore- at PA_MAJORMINOR@.la librtp.la libpulsecommon- at PA_MAJORMINOR@.la libpulse.la
diff --git a/src/modules/raop/base64.c b/src/modules/raop/base64.c
deleted file mode 100644
index d541745..0000000
--- a/src/modules/raop/base64.c
+++ /dev/null
@@ -1,136 +0,0 @@
-/***
- This file is part of PulseAudio.
-
- Copyright 2008 Colin Guthrie
-
- PulseAudio is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published
- by the Free Software Foundation; either version 2.1 of the License,
- or (at your option) any later version.
-
- PulseAudio is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
-***/
-
-/***
- This file was originally inspired by a file developed by
- Kungliga Tekniska Høgskolan.
-***/
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <stdlib.h>
-#include <string.h>
-
-#include <pulse/xmalloc.h>
-
-#include "base64.h"
-
-static const char base64_chars[] =
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
-static int pos(char c) {
- if (c >= 'A' && c <= 'Z')
- return c - 'A' + 0;
- if (c >= 'a' && c <= 'z')
- return c - 'a' + 26;
- if (c >= '0' && c <= '9')
- return c - '0' + 52;
- if (c == '+')
- return 62;
- if (c == '/')
- return 63;
-
- return -1;
-}
-
-int pa_base64_encode(const void *data, int size, char **str) {
- char *s, *p;
- int i;
- int c;
- const unsigned char *q;
-
- p = s = pa_xnew(char, size * 4 / 3 + 4);
- q = (const unsigned char *) data;
- for (i = 0; i < size;) {
- c = q[i++];
- c *= 256;
- if (i < size)
- c += q[i];
- i++;
- c *= 256;
- if (i < size)
- c += q[i];
- i++;
- p[0] = base64_chars[(c & 0x00fc0000) >> 18];
- p[1] = base64_chars[(c & 0x0003f000) >> 12];
- p[2] = base64_chars[(c & 0x00000fc0) >> 6];
- p[3] = base64_chars[(c & 0x0000003f) >> 0];
- if (i > size)
- p[3] = '=';
- if (i > size + 1)
- p[2] = '=';
- p += 4;
- }
-
- *p = 0;
- *str = s;
-
- return strlen(s);
-}
-
-#define DECODE_ERROR 0xffffffff
-
-static unsigned int token_decode(const char *token) {
- int i;
- unsigned int val = 0;
- int marker = 0;
-
- if (strlen(token) < 4)
- return DECODE_ERROR;
- for (i = 0; i < 4; i++) {
- val *= 64;
- if (token[i] == '=')
- marker++;
- else if (marker > 0)
- return DECODE_ERROR;
- else {
- int lpos = pos(token[i]);
- if (lpos < 0)
- return DECODE_ERROR;
- val += lpos;
- }
- }
-
- if (marker > 2)
- return DECODE_ERROR;
-
- return (marker << 24) | val;
-}
-
-int pa_base64_decode(const char *str, void *data) {
- const char *p;
- unsigned char *q;
-
- q = data;
- for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) {
- unsigned int val = token_decode(p);
- unsigned int marker = (val >> 24) & 0xff;
- if (val == DECODE_ERROR)
- return -1;
- *q++ = (val >> 16) & 0xff;
- if (marker < 2)
- *q++ = (val >> 8) & 0xff;
- if (marker < 1)
- *q++ = val & 0xff;
- }
-
- return q - (unsigned char *) data;
-}
diff --git a/src/modules/raop/base64.h b/src/modules/raop/base64.h
deleted file mode 100644
index ce6b9c4..0000000
--- a/src/modules/raop/base64.h
+++ /dev/null
@@ -1,32 +0,0 @@
-#ifndef foobase64hfoo
-#define foobase64hfoo
-
-/***
- This file is part of PulseAudio.
-
- Copyright 2008 Colin Guthrie
- Copyright Kungliga Tekniska Høgskolan
-
- PulseAudio is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published
- by the Free Software Foundation; either version 2.1 of the License,
- or (at your option) any later version.
-
- PulseAudio is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
-***/
-
-/***
- This file was originally inspired by a file developed by
- Kungliga Tekniska Høgskolan.
-***/
-
-int pa_base64_encode(const void *data, int size, char **str);
-int pa_base64_decode(const char *str, void *data);
-
-#endif
diff --git a/src/modules/raop/raop_client.c b/src/modules/raop/raop_client.c
index 5c825eb..a2ec91e 100644
--- a/src/modules/raop/raop_client.c
+++ b/src/modules/raop/raop_client.c
@@ -53,7 +53,7 @@
#include "rtsp_client.h"
#include "raop_packet_buffer.h"
#include "raop_crypto.h"
-#include "base64.h"
+#include "raop_util.h"
#define JACK_STATUS_DISCONNECTED 0
#define JACK_STATUS_CONNECTED 1
@@ -528,7 +528,7 @@ static void do_rtsp_announce(pa_raop_client *c) {
/* UDP protocol does not need "Apple-Challenge" at announce. */
if (c->protocol == RAOP_TCP) {
pa_random(&rand_data, sizeof(rand_data));
- pa_base64_encode(&rand_data, sizeof(rand_data), &sac);
+ pa_raop_base64_encode(&rand_data, 8*sizeof(rand_data), &sac);
rtrimchar(sac, '=');
pa_rtsp_add_header(c->rtsp, "Apple-Challenge", sac);
}
@@ -689,7 +689,7 @@ static void udp_rtsp_cb(pa_rtsp_client *rtsp, pa_rtsp_state state, pa_headerlist
/* Set the Apple-Challenge key */
pa_random(&rand, sizeof(rand));
- pa_base64_encode(&rand, sizeof(rand), &sac);
+ pa_raop_base64_encode(&rand, 8*sizeof(rand), &sac);
rtrimchar(sac, '=');
pa_rtsp_add_header(c->rtsp, "Apple-Challenge", sac);
diff --git a/src/modules/raop/raop_crypto.c b/src/modules/raop/raop_crypto.c
index cd2934b..eacf392 100644
--- a/src/modules/raop/raop_crypto.c
+++ b/src/modules/raop/raop_crypto.c
@@ -37,7 +37,7 @@
#include <pulsecore/random.h>
#include "raop_crypto.h"
-#include "base64.h"
+#include "raop_util.h"
#define AES_CHUNK_SIZE 16
@@ -68,9 +68,9 @@ static int rsa_encrypt(uint8_t *data, int len, uint8_t *str) {
pa_assert(str);
rsa = RSA_new();
- size = pa_base64_decode(rsa_modulus, modules);
+ size = pa_raop_base64_decode(rsa_modulus, modules);
rsa->n = BN_bin2bn(modules, size, NULL);
- size = pa_base64_decode(rsa_exponent, exponent);
+ size = pa_raop_base64_decode(rsa_exponent, exponent);
rsa->e = BN_bin2bn(exponent, size, NULL);
size = RSA_public_encrypt(len, data, str, rsa, RSA_PKCS1_OAEP_PADDING);
@@ -102,7 +102,7 @@ char* pa_raop_secret_get_iv(pa_raop_secret *s) {
pa_assert(s);
- pa_base64_encode(s->iv, AES_CHUNK_SIZE, &base64_iv);
+ pa_raop_base64_encode(s->iv, AES_CHUNK_SIZE, &base64_iv);
return base64_iv;
}
@@ -116,7 +116,7 @@ char* pa_raop_secret_get_key(pa_raop_secret *s) {
/* Encrypt our AES public key to send to the device */
size = rsa_encrypt(s->key, AES_CHUNK_SIZE, rsa_key);
- pa_base64_encode(rsa_key, size, &base64_key);
+ pa_raop_base64_encode(rsa_key, size, &base64_key);
return base64_key;
}
diff --git a/src/modules/raop/raop_util.c b/src/modules/raop/raop_util.c
new file mode 100644
index 0000000..54f7c6d
--- /dev/null
+++ b/src/modules/raop/raop_util.c
@@ -0,0 +1,170 @@
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2013 Martin Blanchard
+ Copyright Kungliga Tekniska Høgskolan & Colin Guthrie
+
+ PulseAudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1 of the License,
+ or (at your option) any later version.
+
+ PulseAudio is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+/***
+ The base64 implementation was originally inspired by a file developed
+ by Kungliga Tekniska Høgskolan.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <openssl/err.h>
+#include <openssl/md5.h>
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/macro.h>
+
+#include "raop_util.h"
+
+#ifndef MD5_DIGEST_LENGTH
+#define MD5_DIGEST_LENGTH 16
+#endif
+
+#define MD5_HASH_LENGTH (2*MD5_DIGEST_LENGTH)
+
+#define BASE64_DECODE_ERROR 0xffffffff
+
+static const char base64_chars[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static int char_position(char c) {
+ if (c >= 'A' && c <= 'Z')
+ return c - 'A' + 0;
+ if (c >= 'a' && c <= 'z')
+ return c - 'a' + 26;
+ if (c >= '0' && c <= '9')
+ return c - '0' + 52;
+ if (c == '+')
+ return 62;
+ if (c == '/')
+ return 63;
+
+ return -1;
+}
+
+static unsigned int token_decode(const char *token) {
+ unsigned int val = 0;
+ int marker = 0;
+ int i;
+
+ if (strlen(token) < 4)
+ return BASE64_DECODE_ERROR;
+ for (i = 0; i < 4; i++) {
+ val *= 64;
+ if (token[i] == '=')
+ marker++;
+ else if (marker > 0)
+ return BASE64_DECODE_ERROR;
+ else {
+ int lpos = char_position(token[i]);
+ if (lpos < 0)
+ return BASE64_DECODE_ERROR;
+ val += lpos;
+ }
+ }
+
+ if (marker > 2)
+ return BASE64_DECODE_ERROR;
+
+ return (marker << 24) | val;
+}
+
+int pa_raop_base64_encode(const void *data, int len, char **str) {
+ const unsigned char *q;
+ char *p, *s = NULL;
+ int i, c;
+
+ pa_assert(data);
+ pa_assert(str);
+
+ p = s = pa_xnew(char, len * 4 / 3 + 4);
+ q = (const unsigned char *) data;
+ for (i = 0; i < len;) {
+ c = q[i++];
+ c *= 256;
+ if (i < len)
+ c += q[i];
+ i++;
+ c *= 256;
+ if (i < len)
+ c += q[i];
+ i++;
+ p[0] = base64_chars[(c & 0x00fc0000) >> 18];
+ p[1] = base64_chars[(c & 0x0003f000) >> 12];
+ p[2] = base64_chars[(c & 0x00000fc0) >> 6];
+ p[3] = base64_chars[(c & 0x0000003f) >> 0];
+ if (i > len)
+ p[3] = '=';
+ if (i > len + 1)
+ p[2] = '=';
+ p += 4;
+ }
+
+ *p = 0;
+ *str = s;
+ return strlen(s);
+}
+
+int pa_raop_base64_decode(const char *str, void *data) {
+ const char *p;
+ unsigned char *q;
+
+ pa_assert(str);
+ pa_assert(data);
+
+ q = data;
+ for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4) {
+ unsigned int val = token_decode(p);
+ unsigned int marker = (val >> 24) & 0xff;
+ if (val == BASE64_DECODE_ERROR)
+ return -1;
+ *q++ = (val >> 16) & 0xff;
+ if (marker < 2)
+ *q++ = (val >> 8) & 0xff;
+ if (marker < 1)
+ *q++ = val & 0xff;
+ }
+
+ return q - (unsigned char *) data;
+}
+
+int pa_raop_md5_hash(const char *data, int len, char **str) {
+ unsigned char d[MD5_DIGEST_LENGTH];
+ char *s = NULL;
+ int i;
+
+ pa_assert(data);
+ pa_assert(str);
+
+ MD5((unsigned char*) data, len, d);
+ s = pa_xnew(char, MD5_HASH_LENGTH);
+ for (i = 0; i < MD5_DIGEST_LENGTH; i++)
+ sprintf(&s[2*i], "%02x", (unsigned int) d[i]);
+
+ *str = s;
+ s[MD5_HASH_LENGTH] = 0;
+ return strlen(s);
+}
diff --git a/src/modules/raop/raop_util.h b/src/modules/raop/raop_util.h
new file mode 100644
index 0000000..a95c822
--- /dev/null
+++ b/src/modules/raop/raop_util.h
@@ -0,0 +1,28 @@
+#ifndef fooraoputilfoo
+#define fooraoputilfoo
+
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2013 Martin Blanchard
+
+ PulseAudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1 of the License,
+ or (at your option) any later version.
+
+ PulseAudio is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+int pa_raop_base64_encode(const void *data, int len, char **str);
+int pa_raop_base64_decode(const char *str, void *data);
+
+int pa_raop_md5_hash(const char *data, int len, char **str);
+
+#endif
--
2.5.0
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