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Allow to pass large blobs and a new content provider to simplify this

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Since AIDL is not for passing large data, a blob can be passed to APG by
a Uri. This Uri is opened as a file by APG and read/written to. Note the
file is overwritten by APG, so make sure it is a copy if you want to
keep the original.

With the ApgServiceBlobProvider, Apg has an own ContentProvider that can
be used like mentioned above. For now the data is stored in the dir
where APG stores other files and NOT DELETED after en/decryption. This
is tbd. It can only be accessed by an application with the permission
"org.thialfihar.android.apg.permission.STORE_BLOBS".

ApgCon has been updated accordingly and can handle blobs with `setBlob`
and `getBlobResult`. That is a really easy way to en/decrypt large data.

Note that encrypting by blob should only be used for large files (1MB+).
On all other cases, the data should be passed as as String through the
AIDl-Interface, so no temporary file must be created.

See ApgCon for a complete example of how to connect to the AIDL and use
it. Or use it in your own project!
This commit is contained in:
Markus Doits
2011-11-04 21:22:49 +01:00
parent a7294d50b1
commit ad16574657
10 changed files with 422 additions and 35 deletions
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18
src/org/thialfihar/android/apg/IApgService.aidl
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@@ -27,6 +27,11 @@ interface IApgService {
*
* (required)
* String "MESSAGE" = Message to encrypt
* OR
* String "BLOB" = ContentUri to a file handle
* with binary data to encrypt
* (Attention: file will be overwritten
* with encrypted content!)
*
* (optional)
* int "ENCRYPTION_ALGORYTHM" = Encryption Algorithm
@@ -55,7 +60,8 @@ interface IApgService {
* String "PRIVATE_KEY_PASSPHRASE" = Passphrase for signing key
*
* Bundle returnVals (in addition to the ERRORS/WARNINGS above):
* String "RESULT" = Encrypted message
* If "MESSAGE" was set:
* String "RESULT" = Encrypted message
*/
/* Additional argument for function below:
@@ -77,7 +83,12 @@ interface IApgService {
/* Bundle params:
* (required)
* String "MESSAGE" = Message to decrypt
* String "MESSAGE" = Message to dencrypt
* OR
* String "BLOB" = ContentUri to a file handle
* with binary data to dencrypt
* (Attention: file will be overwritten
* with dencrypted content!)
*
* (optional)
* String "SYMMETRIC_PASSPHRASE" = Symmetric passphrase for decryption
@@ -86,7 +97,8 @@ interface IApgService {
* String "PRIVATE_KEY_PASSPHRASE" = Private keys's passphrase on asymmetric encryption
*
* Bundle return_vals:
* String "RESULT" = Decrypted message
* If "MESSAGE" was set:
* String "RESULT" = Decrypted message
*/
boolean decrypt(in Bundle params, out Bundle returnVals);