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mirror_buffer.c cleanup in creating video aes ctr key and iv

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fduncanh
2022-01-21 16:49:17 -05:00
parent 5c70725181
commit 1ac3876b44
5 changed files with 22 additions and 29 deletions
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43
lib/mirror_buffer.c
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@@ -37,42 +37,35 @@ struct mirror_buffer_s {
};
void
mirror_buffer_init_aes(mirror_buffer_t *mirror_buffer, uint64_t streamConnectionID)
mirror_buffer_init_aes(mirror_buffer_t *mirror_buffer, uint64_t *streamConnectionID)
{
unsigned char eaeskey[16];
memcpy(eaeskey, mirror_buffer->aeskey, 16);
unsigned char hash1[64];
unsigned char hash2[64];
char* skey = "AirPlayStreamKey";
char* siv = "AirPlayStreamIV";
unsigned char skeyall[255];
unsigned char sivall[255];
sprintf((char*) skeyall, "%s%" PRIu64, skey, streamConnectionID);
sprintf((char*) sivall, "%s%" PRIu64, siv, streamConnectionID);
unsigned char aeskey_audio[16];
unsigned char aeskey_video[64];
unsigned char aesiv_video[64];
memcpy(aeskey_audio, mirror_buffer->aeskey, 16);
sprintf((char*) aeskey_video, "AirPlayStreamKey%" PRIu64, *streamConnectionID);
sprintf((char*) aesiv_video, "AirPlayStreamIV%" PRIu64, *streamConnectionID);
sha_ctx_t *ctx = sha_init();
sha_update(ctx, skeyall, strlen((char*) skeyall));
sha_update(ctx, eaeskey, 16);
sha_final(ctx, hash1, NULL);
sha_update(ctx, aeskey_video, strlen((char*) aeskey_video));
sha_update(ctx, aeskey_audio, 16);
sha_final(ctx, aeskey_video, NULL);
sha_reset(ctx);
sha_update(ctx, sivall, strlen((char*) sivall));
sha_update(ctx, eaeskey, 16);
sha_final(ctx, hash2, NULL);
sha_update(ctx, aesiv_video, strlen((char*) aesiv_video));
sha_update(ctx, aeskey_audio, 16);
sha_final(ctx, aesiv_video, NULL);
sha_destroy(ctx);
unsigned char decrypt_aeskey[16];
unsigned char decrypt_aesiv[16];
memcpy(decrypt_aeskey, hash1, 16);
memcpy(decrypt_aesiv, hash2, 16);
// Need to be initialized externally
mirror_buffer->aes_ctx = aes_ctr_init(aeskey_video, aesiv_video);
#ifdef DUMP_KEI_IV
FILE* keyfile = fopen("/sdcard/111.keyiv", "wb");
fwrite(decrypt_aeskey, 16, 1, keyfile);
fwrite(decrypt_aesiv, 16, 1, keyfile);
fwrite(aeskey_video, 16, 1, keyfile);
fwrite(aesiv_video, 16, 1, keyfile);
fclose(keyfile);
#endif
// Need to be initialized externally
mirror_buffer->aes_ctx = aes_ctr_init(decrypt_aeskey, decrypt_aesiv);
mirror_buffer->nextDecryptCount = 0;
}