tc_ccm_config() function

-- CCM state

IN -- AES key schedule

IN - nonce

-- nonce length in bytes

-- mac length in bytes (parameter t in SP-800 38C)

CCM tag generation and encryption procedure @note: out buffer should be at least (plen + c->mlen) bytes long. @note: The sequence b for encryption is formatted as follows: b = [FLAGS | nonce | counter ], where: FLAGS is 1 byte long nonce is 13 bytes long counter is 2 bytes long The byte FLAGS is composed by the following 8 bits: 0-2 bits: used to represent the value of q-1 3-7 btis: always 0's @note: The sequence b for authentication is formatted as follows: b = [FLAGS | nonce | length(mac length)], where: FLAGS is 1 byte long nonce is 13 bytes long length(mac length) is 2 bytes long The byte FLAGS is composed by the following 8 bits: 0-2 bits: used to represent the value of q-1 3-5 bits: mac length (encoded as: (mlen-2)/2) 6: Adata (0 if alen == 0, and 1 otherwise) 7: always 0

CCM decryption and tag verification procedure @note: out buffer should be at least (plen - c->mlen) bytes long. @note: The sequence b for encryption is formatted as follows: b = [FLAGS | nonce | counter ], where: FLAGS is 1 byte long nonce is 13 bytes long counter is 2 bytes long The byte FLAGS is composed by the following 8 bits: 0-2 bits: used to represent the value of q-1 3-7 btis: always 0's @note: The sequence b for authentication is formatted as follows: b = [FLAGS | nonce | length(mac length)], where: FLAGS is 1 byte long nonce is 13 bytes long length(mac length) is 2 bytes long The byte FLAGS is composed by the following 8 bits: 0-2 bits: used to represent the value of q-1 3-5 bits: mac length (encoded as: (mlen-2)/2) 6: Adata (0 if alen == 0, and 1 otherwise) 7: always 0