Class CryptoAttribute

Class for the crypto SDP attribute for SRTP. See Section 9 of RFC 4568. The format is like:

a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:PS1uQCVeeCFCanVmcjkpPywjNWhcYD0mXXtxaVBR|2^20|1:4

There may be more than one inline parameter. inline parameters are delimited by a ";".

Inheritance
object
CryptoAttribute
Inherited Members
Namespace: SipLib.RtpCrypto
Assembly: SipLib.dll
Syntax
public class CryptoAttribute

Fields

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CryptoSuite

Specifies the crypto-suite to use. The default is AES_CM_128_HMAC_SHA1_80.

Declaration
public string CryptoSuite
Field Value
Type Description
string
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FEC_KEY

Specifies the fec-key session parameter. The value depends upon the FEC scheme being used. Optional. Set to null if it is not specified.

Declaration
public string? FEC_KEY
Field Value
Type Description
string
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FEC_ORDER

Specifies the fec-order (for forward error correction) session parameter. Must be "FEC_SRTP" or "SRTP_FEC". Optional. Set to null if it is not specified.

Declaration
public string? FEC_ORDER
Field Value
Type Description
string
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InlineParameters

Contains a list of key-params. This list must contain at least 1 element.

Declaration
public List<InlineParams> InlineParameters
Field Value
Type Description
List<InlineParams>
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KDR

Specifies the Key Derivation Rate. Must be in the range of 0 - 24 and is an integer power of 2. Optional. Set to -1 to indicate not specified. An unspecified KDR means that the default KDR of 0 should be used.

Declaration
public int KDR
Field Value
Type Description
int
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Tag

Value of the tag parameter.

Declaration
public int Tag
Field Value
Type Description
int
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WSH

Specifies the Window Size Hint used for replay detection. This session parameter is optional. The minimum value is 64. A value of -1 indicates that the field has not been set.

Declaration
public int WSH
Field Value
Type Description
int

Methods

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Parse(string)

Parses the value portion of a crypto SDP attribute. See Section 9.1 of RFC 4568. The ABNF for the value portion of this attribute is: tag 1WSP crypto-suite 1WSP key-params (1WSP session-param)

Declaration
public static CryptoAttribute? Parse(string strCrypto)
Parameters
Type Name Description
string strCrypto

Input containing the value portion of a crypto SDP attribute.
Returns
Type Description
CryptoAttribute

Returns a new CryptoAttribute object if successful or null if an error occurred or the crypto suite is not supported.
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ToString()

Converts this object to a string.

Declaration
public string ToString()
Returns
Type Description
string

Returns the string version of this object that can be used for the parameters part of a crypto SDP attribute.