History

Merge commit 'ab2ad8bd56882c0ea160b154e8b836eb71abc49d'

* commit 'ab2ad8bd56882c0ea160b154e8b836eb71abc49d': lavf: Add functions for SRTP decryption/encryption lavu: Add an API for calculating HMAC (RFC 2104) Conflicts: doc/APIchanges libavutil/version.h

Michael Niedermayer committed 13 years ago

Commit e7e01862 parents e074fe2 ab2ad8b7 files · +584 −1Browse files

Unified · Split

7 files
  1. doc/APIchanges +3 −0
  2. libavformat/srtp.c +293 −0
  3. libavformat/srtp.h +52 −0
  4. libavutil/Makefile +2 −0
  5. libavutil/hmac.c +138 −0
  6. libavutil/hmac.h +95 −0
  7. libavutil/version.h +1 −1
doc/APIchanges+3−0
@@ -132,6 +132,9 @@ API changes, most recent first: · 131 unmodified lines
132132 2012-03-26 - a67d9cf - lavfi 2.66.100
133133 Add avfilter_fill_frame_from_{audio_,}buffer_ref() functions.
134134
135+2013-01-xx - xxxxxxx - lavu 52.5.0 - hmac.h
136+ Add AVHMAC.
137+
135138 2013-01-13 - xxxxxxx - lavc 54.36.0 - vdpau.h
136139 Add AVVDPAUContext struct for VDPAU hardware-accelerated decoding.
137140
libavformat/srtp.c+293−0
@@ -0,0 +1,293 @@
1+/*
2+ * SRTP encryption/decryption
3+ * Copyright (c) 2012 Martin Storsjo
4+ *
5+ * This file is part of FFmpeg.
6+ *
7+ * FFmpeg is free software; you can redistribute it and/or
8+ * modify it under the terms of the GNU Lesser General Public
9+ * License as published by the Free Software Foundation; either
10+ * version 2.1 of the License, or (at your option) any later version.
11+ *
12+ * FFmpeg is distributed in the hope that it will be useful,
13+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
14+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15+ * Lesser General Public License for more details.
16+ *
17+ * You should have received a copy of the GNU Lesser General Public
18+ * License along with FFmpeg; if not, write to the Free Software
19+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20+ */
21+
22+#include "libavutil/base64.h"
23+#include "libavutil/aes.h"
24+#include "libavutil/hmac.h"
25+#include "libavutil/intreadwrite.h"
26+#include "libavutil/log.h"
27+#include "rtp.h"
28+#include "srtp.h"
29+
30+void ff_srtp_free(struct SRTPContext *s)
31+{
32+ if (!s)
33+ return;
34+ av_freep(&s->aes);
35+ if (s->hmac)
36+ av_hmac_free(s->hmac);
37+ s->hmac = NULL;
38+}
39+
40+static void encrypt_counter(struct AVAES *aes, uint8_t *iv, uint8_t *outbuf,
41+ int outlen)
42+{
43+ int i, j, outpos;
44+ for (i = 0, outpos = 0; outpos < outlen; i++) {
45+ uint8_t keystream[16];
46+ AV_WB16(&iv[14], i);
47+ av_aes_crypt(aes, keystream, iv, 1, NULL, 0);
48+ for (j = 0; j < 16 && outpos < outlen; j++, outpos++)
49+ outbuf[outpos] ^= keystream[j];
50+ }
51+}
52+
53+static void derive_key(struct AVAES *aes, const uint8_t *salt, int label,
54+ uint8_t *out, int outlen)
55+{
56+ uint8_t input[16] = { 0 };
57+ memcpy(input, salt, 14);
58+ // Key derivation rate assumed to be zero
59+ input[14 - 7] ^= label;
60+ memset(out, 0, outlen);
61+ encrypt_counter(aes, input, out, outlen);
62+}
63+
64+int ff_srtp_set_crypto(struct SRTPContext *s, const char *suite,
65+ const char *params)
66+{
67+ uint8_t buf[30];
68+
69+ ff_srtp_free(s);
70+
71+ // RFC 4568
72+ if (!strcmp(suite, "AES_CM_128_HMAC_SHA1_80")) {
73+ s->hmac_size = 10;
74+ } else if (!strcmp(suite, "AES_CM_128_HMAC_SHA1_32")) {
75+ s->hmac_size = 4;
76+ } else {
77+ av_log(NULL, AV_LOG_WARNING, "SRTP Crypto suite %s not supported\n",
78+ suite);
79+ return AVERROR(EINVAL);
80+ }
81+ if (av_base64_decode(buf, params, sizeof(buf)) != sizeof(buf)) {
82+ av_log(NULL, AV_LOG_WARNING, "Incorrect amount of SRTP params\n");
83+ return AVERROR(EINVAL);
84+ }
85+ // MKI and lifetime not handled yet
86+ s->aes = av_aes_alloc();
87+ s->hmac = av_hmac_alloc(AV_HMAC_SHA1);
88+ if (!s->aes || !s->hmac)
89+ return AVERROR(ENOMEM);
90+ memcpy(s->master_key, buf, 16);
91+ memcpy(s->master_salt, buf + 16, 14);
92+
93+ // RFC 3711
94+ av_aes_init(s->aes, s->master_key, 128, 0);
95+
96+ derive_key(s->aes, s->master_salt, 0x00, s->rtp_key, sizeof(s->rtp_key));
97+ derive_key(s->aes, s->master_salt, 0x02, s->rtp_salt, sizeof(s->rtp_salt));
98+ derive_key(s->aes, s->master_salt, 0x01, s->rtp_auth, sizeof(s->rtp_auth));
99+
100+ derive_key(s->aes, s->master_salt, 0x03, s->rtcp_key, sizeof(s->rtcp_key));
101+ derive_key(s->aes, s->master_salt, 0x05, s->rtcp_salt, sizeof(s->rtcp_salt));
102+ derive_key(s->aes, s->master_salt, 0x04, s->rtcp_auth, sizeof(s->rtcp_auth));
103+ return 0;
104+}
105+
106+static void create_iv(uint8_t *iv, const uint8_t *salt, uint64_t index,
107+ uint32_t ssrc)
108+{
109+ uint8_t indexbuf[8];
110+ int i;
111+ memset(iv, 0, 16);
112+ AV_WB32(&iv[4], ssrc);
113+ AV_WB64(indexbuf, index);
114+ for (i = 0; i < 8; i++) // index << 16
115+ iv[6 + i] ^= indexbuf[i];
116+ for (i = 0; i < 14; i++)
117+ iv[i] ^= salt[i];
118+}
119+
120+int ff_srtp_decrypt(struct SRTPContext *s, uint8_t *buf, int *lenptr)
121+{
122+ uint8_t iv[16] = { 0 }, hmac[20];
123+ int len = *lenptr;
124+ int ext, seq_largest;
125+ uint32_t ssrc, roc;
126+ uint64_t index;
127+ int rtcp;
128+
129+ // TODO: Missing replay protection
130+
131+ if (len < s->hmac_size)
132+ return AVERROR_INVALIDDATA;
133+
134+ rtcp = RTP_PT_IS_RTCP(buf[1]);
135+
136+ // Authentication HMAC
137+ av_hmac_init(s->hmac, rtcp ? s->rtcp_auth : s->rtp_auth, sizeof(s->rtp_auth));
138+ // If MKI is used, this should exclude the MKI as well
139+ av_hmac_update(s->hmac, buf, len - s->hmac_size);
140+
141+ if (!rtcp) {
142+ int seq = AV_RB16(buf + 2);
143+ uint32_t v;
144+ uint8_t rocbuf[4];
145+
146+ // RFC 3711 section 3.3.1, appendix A
147+ seq_largest = s->seq_initialized ? s->seq_largest : seq;
148+ v = roc = s->roc;
149+ if (seq_largest < 32768) {
150+ if (seq - seq_largest > 32768)
151+ v = roc - 1;
152+ } else {
153+ if (seq_largest - 32768 > seq)
154+ v = roc + 1;
155+ }
156+ if (v == roc) {
157+ seq_largest = FFMAX(seq_largest, seq);
158+ } else if (v == roc + 1) {
159+ seq_largest = seq;
160+ roc = v;
161+ }
162+ index = seq + (((uint64_t)v) << 16);
163+
164+ AV_WB32(rocbuf, roc);
165+ av_hmac_update(s->hmac, rocbuf, 4);
166+ }
167+
168+ av_hmac_final(s->hmac, hmac, sizeof(hmac));
169+ if (memcmp(hmac, buf + len - s->hmac_size, s->hmac_size)) {
170+ av_log(NULL, AV_LOG_WARNING, "HMAC mismatch\n");
171+ return AVERROR_INVALIDDATA;
172+ }
173+
174+ len -= s->hmac_size;
175+ *lenptr = len;
176+
177+ if (len < 12)
178+ return AVERROR_INVALIDDATA;
179+
180+ if (rtcp) {
181+ uint32_t srtcp_index = AV_RB32(buf + len - 4);
182+ len -= 4;
183+ *lenptr = len;
184+
185+ ssrc = AV_RB32(buf + 4);
186+ index = srtcp_index & 0x7fffffff;
187+
188+ buf += 8;
189+ len -= 8;
190+ if (!(srtcp_index & 0x80000000))
191+ return 0;
192+ } else {
193+ s->seq_initialized = 1;
194+ s->seq_largest = seq_largest;
195+ s->roc = roc;
196+
197+ ext = buf[0] & 0x10;
198+ ssrc = AV_RB32(buf + 8);
199+
200+ buf += 12;
201+ len -= 12;
202+
203+ if (ext) {
204+ if (len < 4)
205+ return AVERROR_INVALIDDATA;
206+ ext = (AV_RB16(buf + 2) + 1) * 4;
207+ if (len < ext)
208+ return AVERROR_INVALIDDATA;
209+ len -= ext;
210+ buf += ext;
211+ }
212+ }
213+
214+ create_iv(iv, rtcp ? s->rtcp_salt : s->rtp_salt, index, ssrc);
215+ av_aes_init(s->aes, rtcp ? s->rtcp_key : s->rtp_key, 128, 0);
216+ encrypt_counter(s->aes, iv, buf, len);
217+
218+ return 0;
219+}
220+
221+int ff_srtp_encrypt(struct SRTPContext *s, const uint8_t *in, int len,
222+ uint8_t *out, int outlen)
223+{
224+ uint8_t iv[16] = { 0 }, hmac[20];
225+ uint64_t index;
226+ uint32_t ssrc;
227+ int rtcp;
228+ uint8_t *buf;
229+
230+ if (len + 14 > outlen)
231+ return 0;
232+ if (len < 12)
233+ return 0;
234+
235+ memcpy(out, in, len);
236+ buf = out;
237+
238+ rtcp = RTP_PT_IS_RTCP(buf[1]);
239+
240+ if (rtcp) {
241+ ssrc = AV_RB32(buf + 4);
242+ index = s->rtcp_index++;
243+
244+ buf += 8;
245+ len -= 8;
246+ } else {
247+ int ext;
248+ int seq = AV_RB16(buf + 2);
249+ ssrc = AV_RB32(buf + 8);
250+
251+ if (seq < s->seq_largest)
252+ s->roc++;
253+ s->seq_largest = seq;
254+ index = seq + (((uint64_t)s->roc) << 16);
255+
256+ ext = buf[0] & 0x10;
257+
258+ buf += 12;
259+ len -= 12;
260+
261+ if (ext) {
262+ if (len < 4)
263+ return AVERROR_INVALIDDATA;
264+ ext = (AV_RB16(buf + 2) + 1) * 4;
265+ if (len < ext)
266+ return AVERROR_INVALIDDATA;
267+ len -= ext;
268+ buf += ext;
269+ }
270+ }
271+
272+ create_iv(iv, rtcp ? s->rtcp_salt : s->rtp_salt, index, ssrc);
273+ av_aes_init(s->aes, rtcp ? s->rtcp_key : s->rtp_key, 128, 0);
274+ encrypt_counter(s->aes, iv, buf, len);
275+
276+ if (rtcp) {
277+ AV_WB32(buf + len, 0x80000000 | index);
278+ len += 4;
279+ }
280+
281+ av_hmac_init(s->hmac, rtcp ? s->rtcp_auth : s->rtp_auth, sizeof(s->rtp_auth));
282+ av_hmac_update(s->hmac, out, buf + len - out);
283+ if (!rtcp) {
284+ uint8_t rocbuf[4];
285+ AV_WB32(rocbuf, s->roc);
286+ av_hmac_update(s->hmac, rocbuf, 4);
287+ }
288+ av_hmac_final(s->hmac, hmac, sizeof(hmac));
289+
290+ memcpy(buf + len, hmac, s->hmac_size);
291+ len += s->hmac_size;
292+ return buf + len - out;
293+}
libavformat/srtp.h+52−0
@@ -0,0 +1,52 @@
1+/*
2+ * SRTP encryption/decryption
3+ * Copyright (c) 2012 Martin Storsjo
4+ *
5+ * This file is part of FFmpeg.
6+ *
7+ * FFmpeg is free software; you can redistribute it and/or
8+ * modify it under the terms of the GNU Lesser General Public
9+ * License as published by the Free Software Foundation; either
10+ * version 2.1 of the License, or (at your option) any later version.
11+ *
12+ * FFmpeg is distributed in the hope that it will be useful,
13+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
14+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15+ * Lesser General Public License for more details.
16+ *
17+ * You should have received a copy of the GNU Lesser General Public
18+ * License along with FFmpeg; if not, write to the Free Software
19+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20+ */
21+
22+#ifndef AVFORMAT_SRTP_H
23+#define AVFORMAT_SRTP_H
24+
25+#include <stdint.h>
26+
27+struct AVAES;
28+struct AVHMAC;
29+
30+struct SRTPContext {
31+ struct AVAES *aes;
32+ struct AVHMAC *hmac;
33+ int hmac_size;
34+ uint8_t master_key[16];
35+ uint8_t master_salt[14];
36+ uint8_t rtp_key[16], rtcp_key[16];
37+ uint8_t rtp_salt[14], rtcp_salt[14];
38+ uint8_t rtp_auth[20], rtcp_auth[20];
39+ int seq_largest, seq_initialized;
40+ uint32_t roc;
41+
42+ uint32_t rtcp_index;
43+};
44+
45+int ff_srtp_set_crypto(struct SRTPContext *s, const char *suite,
46+ const char *params);
47+void ff_srtp_free(struct SRTPContext *s);
48+int ff_srtp_decrypt(struct SRTPContext *s, uint8_t *buf, int *lenptr);
49+int ff_srtp_encrypt(struct SRTPContext *s, const uint8_t *in, int len,
50+ uint8_t *out, int outlen);
51+
52+#endif /* AVFORMAT_SRTP_H */
libavutil/Makefile+2−0
@@ -22,6 +22,7 @@ HEADERS = adler32.h \ · 21 unmodified lines
2222 eval.h \
2323 fifo.h \
2424 file.h \
25+ hmac.h \
2526 imgutils.h \
2627 intfloat.h \
2728 intfloat_readwrite.h \
@@ -72,6 +73,7 @@ OBJS = adler32.o \ · 44 unmodified lines
7273 fifo.o \
7374 file.o \
7475 float_dsp.o \
76+ hmac.o \
7577 imgutils.o \
7678 intfloat_readwrite.o \
7779 intmath.o \
libavutil/hmac.c+138−0
@@ -0,0 +1,138 @@
1+/*
2+ * Copyright (C) 2012 Martin Storsjo
3+ *
4+ * This file is part of FFmpeg.
5+ *
6+ * FFmpeg is free software; you can redistribute it and/or
7+ * modify it under the terms of the GNU Lesser General Public
8+ * License as published by the Free Software Foundation; either
9+ * version 2.1 of the License, or (at your option) any later version.
10+ *
11+ * FFmpeg is distributed in the hope that it will be useful,
12+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
13+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14+ * Lesser General Public License for more details.
15+ *
16+ * You should have received a copy of the GNU Lesser General Public
17+ * License along with FFmpeg; if not, write to the Free Software
18+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19+ */
20+
21+#include <string.h>
22+
23+#include "hmac.h"
24+#include "md5.h"
25+#include "sha.h"
26+#include "mem.h"
27+
28+#define MAX_HASHLEN 20
29+#define MAX_BLOCKLEN 64
30+
31+struct AVHMAC {
32+ void *hash;
33+ int blocklen, hashlen;
34+ void (*final)(void*, uint8_t*);
35+ void (*update)(void*, const uint8_t*, int len);
36+ void (*init)(void*);
37+ uint8_t key[MAX_BLOCKLEN];
38+ int keylen;
39+};
40+
41+static void sha1_init(void *ctx)
42+{
43+ av_sha_init(ctx, 160);
44+}
45+
46+AVHMAC *av_hmac_alloc(enum AVHMACType type)
47+{
48+ AVHMAC *c = av_mallocz(sizeof(*c));
49+ if (!c)
50+ return NULL;
51+ switch (type) {
52+ case AV_HMAC_MD5:
53+ c->blocklen = 64;
54+ c->hashlen = 16;
55+ c->init = av_md5_init;
56+ c->update = av_md5_update;
57+ c->final = av_md5_final;
58+ c->hash = av_md5_alloc();
59+ break;
60+ case AV_HMAC_SHA1:
61+ c->blocklen = 64;
62+ c->hashlen = 20;
63+ c->init = sha1_init;
64+ c->update = av_sha_update;
65+ c->final = av_sha_final;
66+ c->hash = av_sha_alloc();
67+ break;
68+ default:
69+ av_free(c);
70+ return NULL;
71+ }
72+ if (!c->hash) {
73+ av_free(c);
74+ return NULL;
75+ }
76+ return c;
77+}
78+
79+void av_hmac_free(AVHMAC *c)
80+{
81+ if (!c)
82+ return;
83+ av_free(c->hash);
84+ av_free(c);
85+}
86+
87+void av_hmac_init(AVHMAC *c, const uint8_t *key, unsigned int keylen)
88+{
89+ int i;
90+ uint8_t block[MAX_BLOCKLEN];
91+ if (keylen > c->blocklen) {
92+ c->init(c->hash);
93+ c->update(c->hash, key, keylen);
94+ c->final(c->hash, c->key);
95+ c->keylen = c->hashlen;
96+ } else {
97+ memcpy(c->key, key, keylen);
98+ c->keylen = keylen;
99+ }
100+ c->init(c->hash);
101+ for (i = 0; i < c->keylen; i++)
102+ block[i] = c->key[i] ^ 0x36;
103+ for (i = c->keylen; i < c->blocklen; i++)
104+ block[i] = 0x36;
105+ c->update(c->hash, block, c->blocklen);
106+}
107+
108+void av_hmac_update(AVHMAC *c, const uint8_t *data, unsigned int len)
109+{
110+ c->update(c->hash, data, len);
111+}
112+
113+int av_hmac_final(AVHMAC *c, uint8_t *out, unsigned int outlen)
114+{
115+ uint8_t block[MAX_BLOCKLEN];
116+ int i;
117+ if (outlen < c->hashlen)
118+ return AVERROR(EINVAL);
119+ c->final(c->hash, out);
120+ c->init(c->hash);
121+ for (i = 0; i < c->keylen; i++)
122+ block[i] = c->key[i] ^ 0x5C;
123+ for (i = c->keylen; i < c->blocklen; i++)
124+ block[i] = 0x5C;
125+ c->update(c->hash, block, c->blocklen);
126+ c->update(c->hash, out, c->hashlen);
127+ c->final(c->hash, out);
128+ return c->hashlen;
129+}
130+
131+int av_hmac_calc(AVHMAC *c, const uint8_t *data, unsigned int len,
132+ const uint8_t *key, unsigned int keylen,
133+ uint8_t *out, unsigned int outlen)
134+{
135+ av_hmac_init(c, key, keylen);
136+ av_hmac_update(c, data, len);
137+ return av_hmac_final(c, out, outlen);
138+}
libavutil/hmac.h+95−0
@@ -0,0 +1,95 @@
1+/*
2+ * Copyright (C) 2012 Martin Storsjo
3+ *
4+ * This file is part of FFmpeg.
5+ *
6+ * FFmpeg is free software; you can redistribute it and/or
7+ * modify it under the terms of the GNU Lesser General Public
8+ * License as published by the Free Software Foundation; either
9+ * version 2.1 of the License, or (at your option) any later version.
10+ *
11+ * FFmpeg is distributed in the hope that it will be useful,
12+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
13+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14+ * Lesser General Public License for more details.
15+ *
16+ * You should have received a copy of the GNU Lesser General Public
17+ * License along with FFmpeg; if not, write to the Free Software
18+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19+ */
20+
21+#ifndef AVUTIL_HMAC_H
22+#define AVUTIL_HMAC_H
23+
24+#include <stdint.h>
25+
26+/**
27+ * @defgroup lavu_hmac HMAC
28+ * @ingroup lavu_crypto
29+ * @{
30+ */
31+
32+enum AVHMACType {
33+ AV_HMAC_MD5,
34+ AV_HMAC_SHA1,
35+};
36+
37+typedef struct AVHMAC AVHMAC;
38+
39+/**
40+ * Allocate an AVHMAC context.
41+ * @param type The hash function used for the HMAC.
42+ */
43+AVHMAC *av_hmac_alloc(enum AVHMACType type);
44+
45+/**
46+ * Free an AVHMAC context.
47+ * @param ctx The context to free, may be NULL
48+ */
49+void av_hmac_free(AVHMAC *ctx);
50+
51+/**
52+ * Initialize an AVHMAC context with an authentication key.
53+ * @param ctx The HMAC context
54+ * @param key The authentication key
55+ * @param keylen The length of the key, in bytes
56+ */
57+void av_hmac_init(AVHMAC *ctx, const uint8_t *key, unsigned int keylen);
58+
59+/**
60+ * Hash data with the HMAC.
61+ * @param ctx The HMAC context
62+ * @param data The data to hash
63+ * @param len The length of the data, in bytes
64+ */
65+void av_hmac_update(AVHMAC *ctx, const uint8_t *data, unsigned int len);
66+
67+/**
68+ * Finish hashing and output the HMAC digest.
69+ * @param ctx The HMAC context
70+ * @param out The output buffer to write the digest into
71+ * @param outlen The length of the out buffer, in bytes
72+ * @return The number of bytes written to out, or a negative error code.
73+ */
74+int av_hmac_final(AVHMAC *ctx, uint8_t *out, unsigned int outlen);
75+
76+/**
77+ * Hash an array of data with a key.
78+ * @param ctx The HMAC context
79+ * @param data The data to hash
80+ * @param len The length of the data, in bytes
81+ * @param key The authentication key
82+ * @param keylen The length of the key, in bytes
83+ * @param out The output buffer to write the digest into
84+ * @param outlen The length of the out buffer, in bytes
85+ * @return The number of bytes written to out, or a negative error code.
86+ */
87+int av_hmac_calc(AVHMAC *ctx, const uint8_t *data, unsigned int len,
88+ const uint8_t *key, unsigned int keylen,
89+ uint8_t *out, unsigned int outlen);
90+
91+/**
92+ * @}
93+ */
94+
95+#endif /* AVUTIL_HMAC_H */
libavutil/version.h+1−1
@@ -75,7 +75,7 @@ · 74 unmodified lines
7575 */
7676
7777 #define LIBAVUTIL_VERSION_MAJOR 52
78−#define LIBAVUTIL_VERSION_MINOR 14
78+#define LIBAVUTIL_VERSION_MINOR 15
7979 #define LIBAVUTIL_VERSION_MICRO 100
8080
8181 #define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \

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