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Simplify the iTunes pairing hash using standard MD5
The pairing hash actually uses standard MD5, so let's simplify the code by using a standard MD5 implementation. Now that function is readable and understandable by mere mortals. Thanks to Jeff Sharkey for posting that simplified version.
This commit is contained in:
Julien BLACHE
parent
2f385bff2c
commit
71a40c5149
@ -3,7 +3,8 @@
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*
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* iTunes - Remote pairing hash function published by Michael Paul Bailey
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* <http://jinxidoru.blogspot.com/2009/06/itunes-remote-pairing-code.html>
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* Derived from Xine-lib source code, src/input/libreal/real.c::hash(), GPLv2+.
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* Simplified version using standard MD5 published by Jeff Sharkey
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* <http://jsharkey.org/blog/2009/06/21/itunes-dacp-pairing-hash-is-broken/>
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*
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* Pairing process based on the work by
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* - Michael Croes
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@ -56,6 +57,8 @@
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#include <event.h>
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#include "evhttp/evhttp.h"
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#include <gcrypt.h>
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#include "logger.h"
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#include "conffile.h"
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#include "mdns_avahi.h"
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@ -97,13 +100,14 @@ static uint64_t libhash;
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static char *
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itunes_pairing_hash(char *paircode, char *pin)
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{
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char param[64];
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char buf[24];
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char hash[33];
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uint32_t *input;
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uint32_t a;
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uint32_t b;
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uint32_t c;
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uint32_t d;
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char ebuf[64];
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uint8_t *hash_bytes;
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size_t hashlen;
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gcry_md_hd_t hd;
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gpg_error_t gc_err;
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int i;
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if (strlen(paircode) != 16)
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{
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@ -117,171 +121,40 @@ itunes_pairing_hash(char *paircode, char *pin)
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return NULL;
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}
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/* Initialization */
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a = 0x67452301;
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b = 0xefcdab89;
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c = 0x98badcfe;
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d = 0x10325476;
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memset(buf, 0, sizeof(buf));
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memcpy(buf, paircode, 16);
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memset(param, 0, sizeof(param));
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param[56] = '\xc0';
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param[24] = '\x80';
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/* Add pin code characters on 16 bits - remember Mac OS X is
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* all UTF-16 (wchar_t).
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*/
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for (i = 0; i < 4; i++)
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buf[16 + (2 * i)] = pin[i];
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strncpy(param, paircode, 16);
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strncpy(param + 16, pin, 4);
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gc_err = gcry_md_open(&hd, GCRY_MD_MD5, 0);
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if (gc_err != GPG_ERR_NO_ERROR)
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{
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gpg_strerror_r(gc_err, ebuf, sizeof(ebuf));
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DPRINTF(E_LOG, L_REMOTE, "Could not open MD5: %s\n", ebuf);
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param[22] = param[19];
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param[20] = param[18];
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param[18] = param[17];
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param[19] = param[17] = 0;
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return NULL;
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}
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input = (uint32_t *)param;
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gcry_md_write(hd, buf, sizeof(buf));
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a = ((b & c) | (~b & d)) + input[0] + a - 0x28955B88;
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a = ((a << 0x07) | (a >> 0x19)) + b;
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d = ((a & b) | (~a & c)) + input[1] + d - 0x173848AA;
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d = ((d << 0x0c) | (d >> 0x14)) + a;
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c = ((d & a) | (~d & b)) + input[2] + c + 0x242070DB;
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c = ((c << 0x11) | (c >> 0x0f)) + d;
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b = ((c & d) | (~c & a)) + input[3] + b - 0x3E423112;
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b = ((b << 0x16) | (b >> 0x0a)) + c;
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a = ((b & c) | (~b & d)) + input[4] + a - 0x0A83F051;
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a = ((a << 0x07) | (a >> 0x19)) + b;
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d = ((a & b) | (~a & c)) + input[5] + d + 0x4787C62A;
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d = ((d << 0x0c) | (d >> 0x14)) + a;
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c = ((d & a) | (~d & b)) + input[6] + c - 0x57CFB9ED;
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c = ((c << 0x11) | (c >> 0x0f)) + d;
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b = ((c & d) | (~c & a)) + input[7] + b - 0x02B96AFF;
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b = ((b << 0x16) | (b >> 0x0a)) + c;
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a = ((b & c) | (~b & d)) + input[8] + a + 0x698098D8;
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a = ((a << 0x07) | (a >> 0x19)) + b;
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d = ((a & b) | (~a & c)) + input[9] + d - 0x74BB0851;
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d = ((d << 0x0c) | (d >> 0x14)) + a;
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c = ((d & a) | (~d & b)) + input[10] + c - 0x0000A44F;
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c = ((c << 0x11) | (c >> 0x0f)) + d;
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b = ((c & d) | (~c & a)) + input[11] + b - 0x76A32842;
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b = ((b << 0x16) | (b >> 0x0a)) + c;
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a = ((b & c) | (~b & d)) + input[12] + a + 0x6B901122;
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a = ((a << 0x07) | (a >> 0x19)) + b;
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d = ((a & b) | (~a & c)) + input[13] + d - 0x02678E6D;
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d = ((d << 0x0c) | (d >> 0x14)) + a;
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c = ((d & a) | (~d & b)) + input[14] + c - 0x5986BC72;
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c = ((c << 0x11) | (c >> 0x0f)) + d;
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b = ((c & d) | (~c & a)) + input[15] + b + 0x49B40821;
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b = ((b << 0x16) | (b >> 0x0a)) + c;
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hash_bytes = gcry_md_read(hd, GCRY_MD_MD5);
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if (!hash_bytes)
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{
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DPRINTF(E_LOG, L_REMOTE, "Could not read MD5 hash\n");
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a = ((b & d) | (~d & c)) + input[1] + a - 0x09E1DA9E;
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a = ((a << 0x05) | (a >> 0x1b)) + b;
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d = ((a & c) | (~c & b)) + input[6] + d - 0x3FBF4CC0;
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d = ((d << 0x09) | (d >> 0x17)) + a;
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c = ((d & b) | (~b & a)) + input[11] + c + 0x265E5A51;
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c = ((c << 0x0e) | (c >> 0x12)) + d;
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b = ((c & a) | (~a & d)) + input[0] + b - 0x16493856;
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b = ((b << 0x14) | (b >> 0x0c)) + c;
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a = ((b & d) | (~d & c)) + input[5] + a - 0x29D0EFA3;
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a = ((a << 0x05) | (a >> 0x1b)) + b;
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d = ((a & c) | (~c & b)) + input[10] + d + 0x02441453;
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d = ((d << 0x09) | (d >> 0x17)) + a;
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c = ((d & b) | (~b & a)) + input[15] + c - 0x275E197F;
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c = ((c << 0x0e) | (c >> 0x12)) + d;
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b = ((c & a) | (~a & d)) + input[4] + b - 0x182C0438;
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b = ((b << 0x14) | (b >> 0x0c)) + c;
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a = ((b & d) | (~d & c)) + input[9] + a + 0x21E1CDE6;
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a = ((a << 0x05) | (a >> 0x1b)) + b;
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d = ((a & c) | (~c & b)) + input[14] + d - 0x3CC8F82A;
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d = ((d << 0x09) | (d >> 0x17)) + a;
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c = ((d & b) | (~b & a)) + input[3] + c - 0x0B2AF279;
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c = ((c << 0x0e) | (c >> 0x12)) + d;
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b = ((c & a) | (~a & d)) + input[8] + b + 0x455A14ED;
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b = ((b << 0x14) | (b >> 0x0c)) + c;
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a = ((b & d) | (~d & c)) + input[13] + a - 0x561C16FB;
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a = ((a << 0x05) | (a >> 0x1b)) + b;
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d = ((a & c) | (~c & b)) + input[2] + d - 0x03105C08;
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d = ((d << 0x09) | (d >> 0x17)) + a;
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c = ((d & b) | (~b & a)) + input[7] + c + 0x676F02D9;
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c = ((c << 0x0e) | (c >> 0x12)) + d;
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b = ((c & a) | (~a & d)) + input[12] + b - 0x72D5B376;
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b = ((b << 0x14) | (b >> 0x0c)) + c;
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return NULL;
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}
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a = (b ^ c ^ d) + input[5] + a - 0x0005C6BE;
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a = ((a << 0x04) | (a >> 0x1c)) + b;
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d = (a ^ b ^ c) + input[8] + d - 0x788E097F;
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d = ((d << 0x0b) | (d >> 0x15)) + a;
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c = (d ^ a ^ b) + input[11] + c + 0x6D9D6122;
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c = ((c << 0x10) | (c >> 0x10)) + d;
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b = (c ^ d ^ a) + input[14] + b - 0x021AC7F4;
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b = ((b << 0x17) | (b >> 0x09)) + c;
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a = (b ^ c ^ d) + input[1] + a - 0x5B4115BC;
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a = ((a << 0x04) | (a >> 0x1c)) + b;
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d = (a ^ b ^ c) + input[4] + d + 0x4BDECFA9;
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d = ((d << 0x0b) | (d >> 0x15)) + a;
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c = (d ^ a ^ b) + input[7] + c - 0x0944B4A0;
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c = ((c << 0x10) | (c >> 0x10)) + d;
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b = (c ^ d ^ a) + input[10] + b - 0x41404390;
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b = ((b << 0x17) | (b >> 0x09)) + c;
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a = (b ^ c ^ d) + input[13] + a + 0x289B7EC6;
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a = ((a << 0x04) | (a >> 0x1c)) + b;
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d = (a ^ b ^ c) + input[0] + d - 0x155ED806;
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d = ((d << 0x0b) | (d >> 0x15)) + a;
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c = (d ^ a ^ b) + input[3] + c - 0x2B10CF7B;
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c = ((c << 0x10) | (c >> 0x10)) + d;
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b = (c ^ d ^ a) + input[6] + b + 0x04881D05;
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b = ((b << 0x17) | (b >> 0x09)) + c;
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a = (b ^ c ^ d) + input[9] + a - 0x262B2FC7;
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a = ((a << 0x04) | (a >> 0x1c)) + b;
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d = (a ^ b ^ c) + input[12] + d - 0x1924661B;
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d = ((d << 0x0b) | (d >> 0x15)) + a;
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c = (d ^ a ^ b) + input[15] + c + 0x1fa27cf8;
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c = ((c << 0x10) | (c >> 0x10)) + d;
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b = (c ^ d ^ a) + input[2] + b - 0x3B53A99B;
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b = ((b << 0x17) | (b >> 0x09)) + c;
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hashlen = gcry_md_get_algo_dlen(GCRY_MD_MD5);
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a = ((~d | b) ^ c) + input[0] + a - 0x0BD6DDBC;
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a = ((a << 0x06) | (a >> 0x1a)) + b;
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d = ((~c | a) ^ b) + input[7] + d + 0x432AFF97;
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d = ((d << 0x0a) | (d >> 0x16)) + a;
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c = ((~b | d) ^ a) + input[14] + c - 0x546BDC59;
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c = ((c << 0x0f) | (c >> 0x11)) + d;
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b = ((~a | c) ^ d) + input[5] + b - 0x036C5FC7;
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b = ((b << 0x15) | (b >> 0x0b)) + c;
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a = ((~d | b) ^ c) + input[12] + a + 0x655B59C3;
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a = ((a << 0x06) | (a >> 0x1a)) + b;
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d = ((~c | a) ^ b) + input[3] + d - 0x70F3336E;
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d = ((d << 0x0a) | (d >> 0x16)) + a;
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c = ((~b | d) ^ a) + input[10] + c - 0x00100B83;
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c = ((c << 0x0f) | (c >> 0x11)) + d;
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b = ((~a | c) ^ d) + input[1] + b - 0x7A7BA22F;
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b = ((b << 0x15) | (b >> 0x0b)) + c;
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a = ((~d | b) ^ c) + input[8] + a + 0x6FA87E4F;
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a = ((a << 0x06) | (a >> 0x1a)) + b;
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d = ((~c | a) ^ b) + input[15] + d - 0x01D31920;
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d = ((d << 0x0a) | (d >> 0x16)) + a;
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c = ((~b | d) ^ a) + input[6] + c - 0x5CFEBCEC;
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c = ((c << 0x0f) | (c >> 0x11)) + d;
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b = ((~a | c) ^ d) + input[13] + b + 0x4E0811A1;
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b = ((b << 0x15) | (b >> 0x0b)) + c;
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a = ((~d | b) ^ c) + input[4] + a - 0x08AC817E;
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a = ((a << 0x06) | (a >> 0x1a)) + b;
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d = ((~c | a) ^ b) + input[11] + d - 0x42C50DCB;
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d = ((d << 0x0a) | (d >> 0x16)) + a;
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c = ((~b | d) ^ a) + input[2] + c + 0x2AD7D2BB;
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c = ((c << 0x0f) | (c >> 0x11)) + d;
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b = ((~a | c) ^ d) + input[9] + b - 0x14792C6F;
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b = ((b << 0x15) | (b >> 0x0b)) + c;
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for (i = 0; i < hashlen; i++)
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sprintf(hash + (2 * i), "%02X", hash_bytes[i]);
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a += 0x67452301;
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b += 0xefcdab89;
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c += 0x98badcfe;
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d += 0x10325476;
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/* Byteswap to big endian */
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a = htobe32(a);
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b = htobe32(b);
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c = htobe32(c);
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d = htobe32(d);
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/* Write out the pairing hash */
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snprintf(hash, sizeof(hash), "%08X%08X%08X%08X", a, b, c, d);
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gcry_md_close(hd);
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return strdup(hash);
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}
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