lavf: Add a fate test for the SRTP functions

Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/Makefile

@@ -379,6 +379,7 @@ EXAMPLES  = metadata                                                    \
             output                                                      \
 
 TESTPROGS = seek                                                        \
+            srtp                                                        \
             url                                                         \
 
 TOOLS     = aviocat                                                     \

libavformat/srtp.c

@@ -291,3 +291,132 @@ int ff_srtp_encrypt(struct SRTPContext *s, const uint8_t *in, int len,
     len += s->hmac_size;
     return buf + len - out;
 }
+
+#ifdef TEST
+#include <stdio.h>
+
+static const char *aes128_80_key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn";
+
+static const uint8_t rtp_aes128_80[] = {
+    // RTP header
+    0x80, 0xe0, 0x12, 0x34,
+    0x12, 0x34, 0x56, 0x78,
+    0x12, 0x34, 0x56, 0x78,
+    // encrypted payload
+    0x62, 0x69, 0x76, 0xca, 0xc5,
+    // HMAC
+    0xa1, 0xac, 0x1b, 0xb4, 0xa0, 0x1c, 0xd5, 0x49, 0x28, 0x99,
+};
+
+static const uint8_t rtcp_aes128_80[] = {
+    // RTCP header
+    0x81, 0xc9, 0x00, 0x07,
+    0x12, 0x34, 0x56, 0x78,
+    // encrypted payload
+    0x8a, 0xac, 0xdc, 0xa5,
+    0x4c, 0xf6, 0x78, 0xa6,
+    0x62, 0x8f, 0x24, 0xda,
+    0x6c, 0x09, 0x3f, 0xa9,
+    0x28, 0x7a, 0xb5, 0x7f,
+    0x1f, 0x0f, 0xc9, 0x35,
+    // RTCP index
+    0x80, 0x00, 0x00, 0x03,
+    // HMAC
+    0xe9, 0x3b, 0xc0, 0x5c, 0x0c, 0x06, 0x9f, 0xab, 0xc0, 0xde,
+};
+
+static const char *aes128_32_key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn";
+
+static const uint8_t rtp_aes128_32[] = {
+    // RTP header
+    0x80, 0xe0, 0x12, 0x34,
+    0x12, 0x34, 0x56, 0x78,
+    0x12, 0x34, 0x56, 0x78,
+    // encrypted payload
+    0x62, 0x69, 0x76, 0xca, 0xc5,
+    // HMAC
+    0xa1, 0xac, 0x1b, 0xb4,
+};
+
+static const uint8_t rtcp_aes128_32[] = {
+    // RTCP header
+    0x81, 0xc9, 0x00, 0x07,
+    0x12, 0x34, 0x56, 0x78,
+    // encrypted payload
+    0x35, 0xe9, 0xb5, 0xff,
+    0x0d, 0xd1, 0xde, 0x70,
+    0x74, 0x10, 0xaa, 0x1b,
+    0xb2, 0x8d, 0xf0, 0x20,
+    0x02, 0x99, 0x6b, 0x1b,
+    0x0b, 0xd0, 0x47, 0x34,
+    // RTCP index
+    0x80, 0x00, 0x00, 0x04,
+    // HMAC
+    0x5b, 0xd2, 0xa9, 0x9d,
+};
+
+static void print_data(const uint8_t *buf, int len)
+{
+    int i;
+    for (i = 0; i < len; i++)
+        printf("%02x", buf[i]);
+    printf("\n");
+}
+
+static int test_decrypt(struct SRTPContext *srtp, const uint8_t *in, int len,
+                        uint8_t *out)
+{
+    memcpy(out, in, len);
+    if (!ff_srtp_decrypt(srtp, out, &len)) {
+        print_data(out, len);
+        return len;
+    } else
+        return -1;
+}
+
+static void test_encrypt(const uint8_t *data, int in_len, const char *suite,
+                         const char *key)
+{
+    struct SRTPContext enc = { 0 }, dec = { 0 };
+    int len;
+    char buf[1500];
+    ff_srtp_set_crypto(&enc, suite, key);
+    ff_srtp_set_crypto(&dec, suite, key);
+    len = ff_srtp_encrypt(&enc, data, in_len, buf, sizeof(buf));
+    if (!ff_srtp_decrypt(&dec, buf, &len)) {
+        if (len == in_len && !memcmp(buf, data, len))
+            printf("Decrypted content matches input\n");
+        else
+            printf("Decrypted content doesn't match input\n");
+    } else {
+        printf("Decryption failed\n");
+    }
+    ff_srtp_free(&enc);
+    ff_srtp_free(&dec);
+}
+
+int main(void)
+{
+    static const char *aes128_80_suite = "AES_CM_128_HMAC_SHA1_80";
+    static const char *aes128_32_suite = "AES_CM_128_HMAC_SHA1_32";
+    static const char *test_key = "abcdefghijklmnopqrstuvwxyz1234567890ABCD";
+    uint8_t buf[1500];
+    struct SRTPContext srtp = { 0 };
+    int len;
+    ff_srtp_set_crypto(&srtp, aes128_80_suite, aes128_80_key);
+    len = test_decrypt(&srtp, rtp_aes128_80, sizeof(rtp_aes128_80), buf);
+    test_encrypt(buf, len, aes128_80_suite, test_key);
+    test_encrypt(buf, len, aes128_32_suite, test_key);
+    test_decrypt(&srtp, rtcp_aes128_80, sizeof(rtcp_aes128_80), buf);
+    test_encrypt(buf, len, aes128_80_suite, test_key);
+    test_encrypt(buf, len, aes128_32_suite, test_key);
+    ff_srtp_free(&srtp);
+
+    memset(&srtp, 0, sizeof(srtp)); // Clear the context
+    ff_srtp_set_crypto(&srtp, aes128_32_suite, aes128_32_key);
+    test_decrypt(&srtp, rtp_aes128_32, sizeof(rtp_aes128_32), buf);
+    test_decrypt(&srtp, rtcp_aes128_32, sizeof(rtcp_aes128_32), buf);
+    ff_srtp_free(&srtp);
+    return 0;
+}
+#endif /* TEST */

tests/fate/libavformat.mak

+FATE_LIBAVFORMAT += fate-srtp
+fate-srtp: libavformat/srtp-test$(EXESUF)
+fate-srtp: CMD = run libavformat/srtp-test
+
 FATE_LIBAVFORMAT += fate-url
 fate-url: libavformat/url-test$(EXESUF)
 fate-url: CMD = run libavformat/url-test

tests/ref/fate/srtp

+80e0123412345678123456780102030405
+Decrypted content matches input
+Decrypted content matches input
+81c90007123456788765432100000000000012340000069ec73069ba000001fd
+Decrypted content matches input
+Decrypted content matches input
+80e0123412345678123456780102030405
+81c90007123456788765432100000000000012340000069ec73069ba000001fd