Documentation
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Overview ¶
Package api provides the ChaCha20 implementation abstract interface.
Index ¶
Constants ¶
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const ( // BlockSize is the size of a ChaCha20 block in bytes. BlockSize = 64 // StateSize is the size of the ChaCha20 state as 32 bit unsigned words. StateSize = 16 // HashSize is the size of the HChaCha output in bytes. HashSize = 32 // HNonceSize is the HChaCha20 nonce size in bytes. HNonceSize = 16 // Sigma0 is the first word of the ChaCha constant. Sigma0 = uint32(0x61707865) // Sigma1 is the second word of the ChaCha constant. Sigma1 = uint32(0x3320646e) // Sigma2 is the third word of the ChaCha constant. Sigma2 = uint32(0x79622d32) // Sigma3 is the fourth word of the ChaCha constant. Sigma3 = uint32(0x6b206574) )
Variables ¶
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Functions ¶
This section is empty.
Types ¶
type Implementation ¶
type Implementation interface {
// Name returns the name of the implementation.
Name() string
// Blocks calculates the ChaCha20 blocks. If src is not nil, dst will
// be set to the XOR of src with the key stream, otherwise dst will be
// set to the key stream.
Blocks(x *[StateSize]uint32, dst, src []byte, nrBlocks int)
// HChaCha calculates the HChaCha20 hash.
//
// Note: `dst` is guaranteed to be HashSize bytes.
HChaCha(key, nonce []byte, dst []byte)
}
Implementation is a ChaCha20 implementation
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