Class EstablishedSas

Shared secret of a SAS verification: emoji or decimals to compare, and MACs over the keys being verified.

Inheritance
object
EstablishedSas
Implements
Inherited Members
Namespace: Uniform.Matrix.Protocol.Crypto
Assembly: Uniform.Matrix.Protocol.Crypto.dll
Syntax
public sealed class EstablishedSas : IDisposable
Remarks

MACs are hkdf-hmac-sha256.v2: HKDF-SHA-256 of the shared secret under the info gives the HMAC key.

Methods

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CalculateMac(string, string)

Calculate the MAC of input, e.g. a key, with info; base64.

Declaration
public string CalculateMac(string input, string info)
Parameters
Type Name Description
string input
string info
Returns
Type Description
string
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Decimals(byte[])

Return the 3 four-digit numbers of bytes: 13 bits each from the first 39 bits, plus 1000.

Declaration
public static int[] Decimals(byte[] bytes)
Parameters
Type Name Description
byte[] bytes
Returns
Type Description
int[]
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Dispose()

Wipe the shared secret.

Declaration
public void Dispose()
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EmojiIndices(byte[])

Return the 7 emoji indices of bytes: 6 bits each from the first 42 bits.

Declaration
public static int[] EmojiIndices(byte[] bytes)
Parameters
Type Name Description
byte[] bytes
Returns
Type Description
int[]
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GetBytes(string)

Return the 6 bytes derived for info, from which EmojiIndices(byte[]) and Decimals(byte[]) come.

Declaration
public byte[] GetBytes(string info)
Parameters
Type Name Description
string info
Returns
Type Description
byte[]
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VerifyMac(string, string, string)

Return whether mac is the MAC of input with info.

Declaration
public bool VerifyMac(string input, string info, string mac)
Parameters
Type Name Description
string input
string info
string mac
Returns
Type Description
bool

Implements