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Fixed pk_verify not being set when writing encrypted entries.

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This commit is contained in:
Nathan Moinvaziri 2020-12-13 10:58:41 -08:00
parent c76f28f217
commit 215a7a84dc
1 changed files with 25 additions and 15 deletions
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40
mz_zip.c
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@ -187,6 +187,16 @@ static int32_t mz_zip_search_zip64_eocd(void *stream, const int64_t end_central_
return err;
}
/* Get PKWARE traditional encryption verifier */
static uint16_t mz_zip_get_pk_verify(uint32_t dos_date, uint64_t crc, uint16_t flag)
{
/* Info-ZIP modification to ZipCrypto format: if bit 3 of the general
* purpose bit flag is set, it uses high byte of 16-bit File Time. */
if (flag & MZ_ZIP_FLAG_DATA_DESCRIPTOR)
return ((dos_date >> 16) & 0xff) << 8 | ((dos_date >> 8) & 0xff);
return ((crc >> 16) & 0xff) << 8 | ((crc >> 24) & 0xff);
}
/* Get info about the current file in the zip file */
static int32_t mz_zip_entry_read_header(void *stream, uint8_t local, mz_zip_file *file_info, void *file_extra_stream) {
uint64_t ntfs_time = 0;
@ -241,15 +251,8 @@ static int32_t mz_zip_entry_read_header(void *stream, uint8_t local, mz_zip_file
err = mz_stream_read_uint32(stream, &file_info->crc);
#ifdef HAVE_PKCRYPT
if (err == MZ_OK && file_info->flag & MZ_ZIP_FLAG_ENCRYPTED) {
/* Info-ZIP modification to ZipCrypto format: if bit 3 of the general
* purpose bit flag is set, it uses high byte of 16-bit File Time. */
if (file_info->flag & MZ_ZIP_FLAG_DATA_DESCRIPTOR)
file_info->pk_verify = ((dos_date >> 16) & 0xff) << 8 |
((dos_date >> 8) & 0xff);
else
file_info->pk_verify = ((file_info->crc >> 16) & 0xff) << 8 |
((file_info->crc >> 24) & 0xff);
/* Use dos_date from header instead of derived from time in zip extensions */
file_info->pk_verify = mz_zip_get_pk_verify(dos_date, file_info->crc, file_info->flag);
}
#endif
if (err == MZ_OK) {
@ -1942,16 +1945,23 @@ int32_t mz_zip_entry_write_open(void *handle, const mz_zip_file *file_info, int1
mz_stream_get_prop_int64(zip->stream, MZ_STREAM_PROP_DISK_NUMBER, &disk_number);
zip->file_info.disk_number = (uint32_t)disk_number;
zip->file_info.disk_offset = mz_stream_tell(zip->stream);
if (zip->file_info.flag & MZ_ZIP_FLAG_ENCRYPTED) {
#ifdef HAVE_PKCRYPT
/* Pre-calculated CRC value is required for PKWARE traditional encryption */
uint32_t dos_date = mz_zip_time_t_to_dos_date(zip->file_info.modified_date);
zip->file_info.pk_verify = mz_zip_get_pk_verify(dos_date, zip->file_info.crc, zip->file_info.flag);
#endif
#ifdef HAVE_WZAES
if (zip->file_info.aes_version && zip->file_info.aes_encryption_mode == 0)
zip->file_info.aes_encryption_mode = MZ_AES_ENCRYPTION_MODE_256;
#endif
}
zip->file_info.crc = 0;
zip->file_info.compressed_size = 0;
#ifdef HAVE_WZAES
if (zip->file_info.aes_version && zip->file_info.aes_encryption_mode == 0)
zip->file_info.aes_encryption_mode = MZ_AES_ENCRYPTION_MODE_256;
#endif
if ((compress_level == 0) || (is_dir))
zip->file_info.compression_method = MZ_COMPRESS_METHOD_STORE;