Package org.bouncycastle.tls.crypto.impl
Class TlsSuiteHMac
- java.lang.Object
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- org.bouncycastle.tls.crypto.impl.TlsSuiteHMac
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- All Implemented Interfaces:
TlsSuiteMac
public final class TlsSuiteHMac extends java.lang.Object implements TlsSuiteMac
A generic TLS MAC implementation, acting as an HMAC based on some underlying Digest.
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Constructor Summary
Constructors Constructor Description TlsSuiteHMac(TlsCryptoParameters cryptoParams, TlsHMAC mac)
Generate a new instance of a TlsMac.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description byte[]
calculateMac(long seqNo, short type, byte[] connectionID, byte[] msg, int msgOff, int msgLen)
Calculate the MAC for some given data.byte[]
calculateMacConstantTime(long seqNo, short type, byte[] connectionID, byte[] msg, int msgOff, int msgLen, int fullLength, byte[] dummyData)
Constant time calculation of the MAC for some given data with a given expected length.int
getSize()
Return the output length (in bytes) of this MAC.
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Constructor Detail
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TlsSuiteHMac
public TlsSuiteHMac(TlsCryptoParameters cryptoParams, TlsHMAC mac)
Generate a new instance of a TlsMac.- Parameters:
cryptoParams
- the TLS client context specific crypto parameters.mac
- The MAC to use.
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Method Detail
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getSize
public int getSize()
Description copied from interface:TlsSuiteMac
Return the output length (in bytes) of this MAC.- Specified by:
getSize
in interfaceTlsSuiteMac
- Returns:
- The output length of this MAC.
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calculateMac
public byte[] calculateMac(long seqNo, short type, byte[] connectionID, byte[] msg, int msgOff, int msgLen)
Description copied from interface:TlsSuiteMac
Calculate the MAC for some given data.- Specified by:
calculateMac
in interfaceTlsSuiteMac
- Parameters:
seqNo
- The sequence number of the record.type
- The content type of the message.msg
- A byte array containing the message.msgOff
- The number of bytes to skip, before the message starts.msgLen
- The length of the message.- Returns:
- A new byte array containing the MAC value.
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calculateMacConstantTime
public byte[] calculateMacConstantTime(long seqNo, short type, byte[] connectionID, byte[] msg, int msgOff, int msgLen, int fullLength, byte[] dummyData)
Description copied from interface:TlsSuiteMac
Constant time calculation of the MAC for some given data with a given expected length.- Specified by:
calculateMacConstantTime
in interfaceTlsSuiteMac
- Parameters:
seqNo
- The sequence number of the record.type
- The content type of the message.msg
- A byte array containing the message.msgOff
- The number of bytes to skip, before the message starts.msgLen
- The length of the message.fullLength
- The expected length of the full message.dummyData
- Random data for padding out the MAC calculation if required.- Returns:
- A new byte array containing the MAC value.
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