Lightweight Cryptography Primitives
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spoc.h File Reference

SpoC authenticated encryption algorithm. More...

#include "aead-common.h"

Go to the source code of this file.

Macros

#define SPOC_KEY_SIZE   16
 Size of the key for all SpoC variants.
 
#define SPOC_128_TAG_SIZE   16
 Size of the authentication tag for SpoC-128.
 
#define SPOC_64_TAG_SIZE   8
 Size of the authentication tag for SpoC-64.
 
#define SPOC_NONCE_SIZE   16
 Size of the nonce for all SpoC variants.
 

Functions

int spoc_128_aead_encrypt (unsigned char *c, unsigned long long *clen, const unsigned char *m, unsigned long long mlen, const unsigned char *ad, unsigned long long adlen, const unsigned char *nsec, const unsigned char *npub, const unsigned char *k)
 Encrypts and authenticates a packet with SpoC-128. More...
 
int spoc_128_aead_decrypt (unsigned char *m, unsigned long long *mlen, unsigned char *nsec, const unsigned char *c, unsigned long long clen, const unsigned char *ad, unsigned long long adlen, const unsigned char *npub, const unsigned char *k)
 Decrypts and authenticates a packet with SpoC-128. More...
 
int spoc_64_aead_encrypt (unsigned char *c, unsigned long long *clen, const unsigned char *m, unsigned long long mlen, const unsigned char *ad, unsigned long long adlen, const unsigned char *nsec, const unsigned char *npub, const unsigned char *k)
 Encrypts and authenticates a packet with SpoC-64. More...
 
int spoc_64_aead_decrypt (unsigned char *m, unsigned long long *mlen, unsigned char *nsec, const unsigned char *c, unsigned long long clen, const unsigned char *ad, unsigned long long adlen, const unsigned char *npub, const unsigned char *k)
 Decrypts and authenticates a packet with SpoC-64. More...
 

Variables

aead_cipher_t const spoc_128_cipher
 Meta-information block for the SpoC-128 cipher.
 
aead_cipher_t const spoc_64_cipher
 Meta-information block for the SpoC-64 cipher.
 

Detailed Description

SpoC authenticated encryption algorithm.

SpoC is a family of authenticated encryption algorithms with two members, SpoC-128 and Spoc-64. The algorithms use a Beetle-like sponge construction built on top of the sLiSCP-light permutation.

Spoc-128 has good performance on small packets (16 bytes or less) on 32-bit embedded platforms.

References: https://uwaterloo.ca/communications-security-lab/lwc/spoc

Function Documentation

int spoc_128_aead_decrypt ( unsigned char *  m,
unsigned long long *  mlen,
unsigned char *  nsec,
const unsigned char *  c,
unsigned long long  clen,
const unsigned char *  ad,
unsigned long long  adlen,
const unsigned char *  npub,
const unsigned char *  k 
)

Decrypts and authenticates a packet with SpoC-128.

Parameters
mBuffer to receive the plaintext message on output.
mlenReceives the length of the plaintext message on output.
nsecSecret nonce - not used by this algorithm.
cBuffer that contains the ciphertext and authentication tag to decrypt.
clenLength of the input data in bytes, which includes the ciphertext and the 16 byte authentication tag.
adBuffer that contains associated data to authenticate along with the packet but which does not need to be encrypted.
adlenLength of the associated data in bytes.
npubPoints to the public nonce for the packet which must be 16 bytes in length.
kPoints to the 16 bytes of the key to use to decrypt the packet.
Returns
0 on success, -1 if the authentication tag was incorrect, or some other negative number if there was an error in the parameters.
See Also
spoc_128_aead_encrypt()
int spoc_128_aead_encrypt ( unsigned char *  c,
unsigned long long *  clen,
const unsigned char *  m,
unsigned long long  mlen,
const unsigned char *  ad,
unsigned long long  adlen,
const unsigned char *  nsec,
const unsigned char *  npub,
const unsigned char *  k 
)

Encrypts and authenticates a packet with SpoC-128.

Parameters
cBuffer to receive the output.
clenOn exit, set to the length of the output which includes the ciphertext and the 16 byte authentication tag.
mBuffer that contains the plaintext message to encrypt.
mlenLength of the plaintext message in bytes.
adBuffer that contains associated data to authenticate along with the packet but which does not need to be encrypted.
adlenLength of the associated data in bytes.
nsecSecret nonce - not used by this algorithm.
npubPoints to the public nonce for the packet which must be 16 bytes in length.
kPoints to the 16 bytes of the key to use to encrypt the packet.
Returns
0 on success, or a negative value if there was an error in the parameters.
See Also
spoc_128_aead_decrypt()
int spoc_64_aead_decrypt ( unsigned char *  m,
unsigned long long *  mlen,
unsigned char *  nsec,
const unsigned char *  c,
unsigned long long  clen,
const unsigned char *  ad,
unsigned long long  adlen,
const unsigned char *  npub,
const unsigned char *  k 
)

Decrypts and authenticates a packet with SpoC-64.

Parameters
mBuffer to receive the plaintext message on output.
mlenReceives the length of the plaintext message on output.
nsecSecret nonce - not used by this algorithm.
cBuffer that contains the ciphertext and authentication tag to decrypt.
clenLength of the input data in bytes, which includes the ciphertext and the 8 byte authentication tag.
adBuffer that contains associated data to authenticate along with the packet but which does not need to be encrypted.
adlenLength of the associated data in bytes.
npubPoints to the public nonce for the packet which must be 16 bytes in length.
kPoints to the 16 bytes of the key to use to decrypt the packet.
Returns
0 on success, -1 if the authentication tag was incorrect, or some other negative number if there was an error in the parameters.
See Also
spoc_64_aead_encrypt()
int spoc_64_aead_encrypt ( unsigned char *  c,
unsigned long long *  clen,
const unsigned char *  m,
unsigned long long  mlen,
const unsigned char *  ad,
unsigned long long  adlen,
const unsigned char *  nsec,
const unsigned char *  npub,
const unsigned char *  k 
)

Encrypts and authenticates a packet with SpoC-64.

Parameters
cBuffer to receive the output.
clenOn exit, set to the length of the output which includes the ciphertext and the 8 byte authentication tag.
mBuffer that contains the plaintext message to encrypt.
mlenLength of the plaintext message in bytes.
adBuffer that contains associated data to authenticate along with the packet but which does not need to be encrypted.
adlenLength of the associated data in bytes.
nsecSecret nonce - not used by this algorithm.
npubPoints to the public nonce for the packet which must be 16 bytes in length.
kPoints to the 16 bytes of the key to use to encrypt the packet.
Returns
0 on success, or a negative value if there was an error in the parameters.
See Also
spoc_64_aead_decrypt()