diff --git a/libavformat/isom.h b/libavformat/isom.h index 78495fd336..5a6d504090 100644 --- a/libavformat/isom.h +++ b/libavformat/isom.h @@ -286,6 +286,10 @@ typedef struct MOVContext { int activation_bytes_size; void *audible_fixed_key; int audible_fixed_key_size; + void *audible_key; + int audible_key_size; + void *audible_iv; + int audible_iv_size; struct AVAES *aes_decrypt; uint8_t *decryption_key; int decryption_key_len; diff --git a/libavformat/mov.c b/libavformat/mov.c index dd0db6bca7..2b90e31170 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -1075,6 +1075,30 @@ fail: return ret; } +static int mov_aaxc_crypto(MOVContext *c) +{ + if (c->audible_key_size != 16) { + av_log(c->fc, AV_LOG_FATAL, "[aaxc] audible_key value needs to be 16 bytes!\n"); + return AVERROR(EINVAL); + } + + if (c->audible_iv_size != 16) { + av_log(c->fc, AV_LOG_FATAL, "[aaxc] audible_iv value needs to be 16 bytes!\n"); + return AVERROR(EINVAL); + } + + c->aes_decrypt = av_aes_alloc(); + if (!c->aes_decrypt) { + return AVERROR(ENOMEM); + } + + memcpy(c->file_key, c->audible_key, 16); + memcpy(c->file_iv, c->audible_iv, 16); + c->aax_mode = 1; + + return 0; +} + // Audible AAX (and AAX+) bytestream decryption static int aax_filter(uint8_t *input, int size, MOVContext *c) { @@ -1123,6 +1147,11 @@ static int mov_read_ftyp(MOVContext *c, AVIOContext *pb, MOVAtom atom) av_dict_set(&c->fc->metadata, "compatible_brands", comp_brands_str, AV_DICT_DONT_STRDUP_VAL); + // Logic for handling Audible's .aaxc files + if (!strcmp(type, "aaxc")) { + mov_aaxc_crypto(c); + } + return 0; } @@ -8170,6 +8199,10 @@ static const AVOption mov_options[] = { AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, .flags = FLAGS }, { "activation_bytes", "Secret bytes for Audible AAX files", OFFSET(activation_bytes), AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_DECODING_PARAM }, + { "audible_key", "AES-128 Key for Audible AAXC files", OFFSET(audible_key), + AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_DECODING_PARAM }, + { "audible_iv", "AES-128 IV for Audible AAXC files", OFFSET(audible_iv), + AV_OPT_TYPE_BINARY, .flags = AV_OPT_FLAG_DECODING_PARAM }, { "audible_fixed_key", // extracted from libAAX_SDK.so and AAXSDKWin.dll files! "Fixed key used for handling Audible AAX files", OFFSET(audible_fixed_key), AV_OPT_TYPE_BINARY, {.str="77214d4b196a87cd520045fd20a51d67"},