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authorDennis Neufeld <dennis.neufeld@students.bfh.ch>2019-10-13 13:26:16 +0200
committerDennis Neufeld <dennis.neufeld@students.bfh.ch>2019-10-13 13:26:16 +0200
commitca0d2b428d3073e8ba09aabb0b1de0fac4b9a63e (patch)
tree8d3784fc09e631a3034275c011c404c2456e34ba /anastasis.rst
parent0822538a1cb6e1b19b04bed09b1cb5ca29b3d032 (diff)
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Worked on issues with anastasis.rst
Diffstat (limited to 'anastasis.rst')
-rw-r--r--anastasis.rst51
1 files changed, 21 insertions, 30 deletions
diff --git a/anastasis.rst b/anastasis.rst
index 35d1803..f20433b 100644
--- a/anastasis.rst
+++ b/anastasis.rst
@@ -145,7 +145,7 @@ determined by an adversary performing a targeted attack, as a user's
likely also be available to other actors.
-.. code-block:: tsref
+::
kdf_id := SCrypt( identifier, server_salt, keysize )
@@ -173,7 +173,7 @@ generate the corresponding public key. Here, "ver" is used as a salt for the
HKDF to ensure that the result differs from other cases where we hash
**kdf_id**.
-.. code-block:: tsref
+::
ver_secret:= HKDF(kdf_id, "ver", keysize)
eddsa_priv := eddsa_d_to_a(ver_secret)
@@ -190,7 +190,7 @@ HKDF to ensure that the result differs from other cases where we hash
**eddsa_d_to_a()**: Function which converts the ver_key to a valid EdDSA private key. Specifically, assuming the value eddsa_priv is in a 32-byte array "digest", the function clears and sets certain bits as follows:
-.. code-block:: tsref
+::
digest[0] = (digest[0] & 0x7f) | 0x40;
digest[31] &= 0xf8;
@@ -208,7 +208,7 @@ symmetric key and an initialization vector (IV). To ensure that the
symmetric key changes for each encryption operation, we compute the
key material using an HKDF over a nonce and the kdf_id.
-.. code-block:: tsref
+::
(iv,key) := HKDF(kdf_id, nonce, keysize + ivsize)
@@ -248,7 +248,7 @@ the **key_share**. To ensure that the key derivation for the encryption
of the **recovery document** differs fundamentally from that of an
individual **key share**, we use different salts ("erd" and "eks" respectively).
-.. code-block:: tsref
+::
(iv0, key0) = HKDF(key_id, nonce0, "erd", keysize + ivsize)
(encrypted_recovery_document, aes_gcm_tag) = AES256_GCM(recovery_document, key0, iv0)
@@ -277,7 +277,7 @@ The EdDSA keys are used to sign the data sent from the client to the
server. Everything the client sends to server is signed. The following
algorithm is equivalent for **Anastasis-Policy-Signature**.
-.. code-block:: tsref
+::
(anastasis-account-signature) = eddsa_sign(h_body, eddsa_priv)
ver_res = eddsa_verifiy(h_body, anastasis-account-signature, eddsa_pub)
@@ -291,7 +291,8 @@ algorithm is equivalent for **Anastasis-Policy-Signature**.
When requesting policy downloads, the client must also provide a signature:
-.. code-block:: tsref
+::
+
(anastasis-account-signature) = eddsa_sign(version, eddsa_priv)
ver_res = eddsa_verifiy(version, anastasis-account-signature, eddsa_pub)
@@ -356,9 +357,7 @@ Obtain salt
Returns a `SaltResponse`_.
- .. _SaltResponse:
- .. _tsref-type-SaltResponse:
- .. code-block:: tsref
+ .. ts:def:: SaltResponse
interface SaltResponse {
// salt value, at least 128 bits of entropy
@@ -379,9 +378,7 @@ Receiving Terms of Service
Returns a `EscrowTermsOfServiceResponse`_.
- .. _EscrowTermsOfServiceResponse:
- .. _tsref-type-EscrowTermsOfServiceResponse:
- .. code-block:: tsref
+ .. ts:def:: EscrowTermsOfServiceResponse
interface EscrowTermsOfServiceResponse {
@@ -428,6 +425,8 @@ Receiving Terms of Service
}
+ .. ts:def:: AuthenticationMethod
+
interface AuthenticationMethod {
// name of the authentication method
name: string;
@@ -550,8 +549,7 @@ public key using the Crockford base32-encoding.
**Details:**
- .. _EncryptedRecoveryDocument:
- .. code-block:: tsref
+ .. ts:def:: EncryptedRecoveryDocument
interface EncryptedRecoveryDocument {
// Nonce used to compute the (iv,key) pair for encryption of the
@@ -569,8 +567,7 @@ public key using the Crockford base32-encoding.
}
- .. _RecoveryDocument:
- .. code-block:: tsref
+ .. ts:def:: RecoveryDocument
interface RecoveryDocument {
// Account identifier at backup provider, AES-encrypted with
@@ -588,8 +585,7 @@ public key using the Crockford base32-encoding.
}
- .. _EscrowMethod:
- .. code-block:: tsref
+ .. ts:def:: EscrowMethod
interface EscrowMethod {
// URL of the escrow provider (including possibly this Anastasis server)
@@ -617,8 +613,7 @@ public key using the Crockford base32-encoding.
}
- .. _EscrowPolicy:
- .. code-block:: tsref
+ .. ts:def:: DecryptionPolicy
interface DecryptionPolicy {
// Salt included to encrypt master key share when
@@ -657,7 +652,7 @@ charge per truth operation using GNU Taler.
Upload a Truth-Object according to the policy the client created before (see RecoveryDocument_).
If request has been seen before, the server should do nothing, and otherwise store the new object.
- FIXME: The body must begin with the EncryptedKeyShare_ as binary block (see below). In addition,
+ The body must begin with the EncryptedKeyShare_ as binary block (see below). In addition,
the name of the chosen key share method, the Base32-encoded ground truth and the MIME type of
Truth must be included in the body.
The Anastasis server cannot fully validate the format, but MAY impose
@@ -684,8 +679,7 @@ charge per truth operation using GNU Taler.
**Details:**
- .. _Truth:
- .. code-block:: tsref
+ .. ts:def:: Truth
interface Truth {
// Contains the information of an `interface EncryptedKeyShare`_, but simply
@@ -744,8 +738,7 @@ charge per truth operation using GNU Taler.
**Details:**
- .. _EncryptedKeyShare:
- .. code-block:: tsref
+ .. ts:def:: EncryptedKeyShare
interface EncryptedKeyShare {
// Nonce used to compute the decryption (iv,key) pair.
@@ -769,8 +762,7 @@ charge per truth operation using GNU Taler.
}
- .. _KeyShare:
- .. code-block:: tsref
+ .. ts:def:: KeyShare
interface KeyShare {
// Key material to concatenate with policy_salt and KDF to derive
@@ -782,8 +774,7 @@ charge per truth operation using GNU Taler.
}
- .. _EscrowChallenge:
- .. code-block:: tsref
+ .. ts:def:: EscrowChallenge
interface EscrowChallenge {
// ground truth, i.e. challenge question,