TElSymmetricCrypto.Padding property

TElSymmetricCrypto.Padding

TElSymmetricCrypto See also

Filter: C# VB.NET Pascal C++ PHP Java

This property specifies the padding mode, used for symmetric encryption or decryption

Declaration

[C#]
TSBSymmetricCipherPadding Padding;

[VB.NET]
Property Padding As TSBSymmetricCipherPadding

[Pascal]
property Padding : TSBSymmetricCipherPadding;

[C++]
TSBSymmetricCipherPadding get_Padding();
void set_Padding(TSBSymmetricCipherPadding Value);

[PHP]
integer get_Padding()
void set_Padding(integer $Value)

[Java]
TSBSymmetricCipherPadding getPadding();
void setPadding(TSBSymmetricCipherPadding Value);

Values

[.NET]	[Pascal]	[C++]	Description
cpNone = 0	cpNone	_cpNone = 0	No padding. This mode can be used only if the data length is multiple of the block length OR if the stream cipher is used OR if stream mode (CTR, CFB8) is used
cpPKCS5 = 1	cpPKCS5	_cpPKCS5 = 1	PKCS#5 padding is used.

Description

Use this property to specify the padding mode for the data. When encrypting the data, the encryptor will apply padding to the data. When decrypting the data, padding mode tells the decryptor what mode was actually used during encryption.

Padding is used to completement the data to have length of multiple of the block size. Padding is used for block modes of block encryption algorithms.

Note: Original PKCS#5 padding is defined for 8 byte encryption blocks only. PKCS#7 generalizes the original definition by extending it to support any block size while leaving the padding method itself unchanged. Certain standards therefore refer to the described padding type as 'PKCS#7 padding'. This might be confusing because 'PKCS#5 padding' name is widely used to refer to the same kind of padding (thus de-facto extending the original PKCS#5 declaration beyond the 8 byte block size limitation).

We understand that it is not entirely correct, but we prefer to keep the PKCS#5 naming for backward compatibility with earlier versions of SecureBlackbox and to avoid confusion with other PKCS#7 types. So whenever you are required to support PKCS#7 symmetric cipher padding, use cpPKCS5 type.