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@@ -48,7 +48,13 @@ blob = AES128-CTR-DECRYPT(encryption_key, IV, encrypted)
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The blob is then used as described in the next section.
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## Blob based Authentication
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-TODO
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+```
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+data = b64_decode(blob)
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+base_key = PBKDF2(SHA1(deviceID), username, 0x100, 1)
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+key = SHA1(base_key) || htonl(len(base_key))
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+login_data = AES192-DECRYPT(key, data)
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+```
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## Facebook based Authentication
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TODO
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+
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Paul Lietar