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/* Symmetrical operation: same function for encrypting as for decrypting. Note any IV/nonce should never be reused with the same key *//* * * This is an implementation of the AES algorithm, specifically ECB, CTR and CBC mode. * Block size can be chosen in aes.h - available choices are AES128, AES192, AES256. * * The implementation is verified against the test vectors in: * National Institute of Standards and Technology Special Publication 800-38A 2001 ED * * ECB-AES128 * ---------- * * plain-text: * 6bc1bee22e409f96e93d7e117393172a * ae2d8a571e03ac9c9eb76fac45af8e51 * 30c81c46a35ce411e5fbc1191a0a52ef * f69f2445df4f9b17ad2b417be66c3710 * * key: * 2b7e151628aed2a6abf7158809cf4f3c * * resulting cipher * 3ad77bb40d7a3660a89ecaf32466ef97 * f5d3d58503b9699de785895a96fdbaaf * 43b1cd7f598ece23881b00e3ed030688 * 7b0c785e27e8ad3f8223207104725dd4 * * * NOTE: String length must be evenly divisible by 16byte (str_len % 16 == 0) * You should pad the end of the string with zeros if this is not the case. * For AES192/256 the key size is proportionally larger. * *//*****************************************************************************//* Includes: *//*****************************************************************************/// CBC mode, for memset/*****************************************************************************//* Defines: *//*****************************************************************************/// The number of columns comprising a state in AES. This is a constant in AES. Value=4// The number of 32 bit words in a key.// The number of rounds in AES Cipher.// jcallan@github points out that declaring Multiply as a function// reduces code size considerably with the Keil ARM compiler.// See this link for more information: https://github.com/kokke/tiny-AES-C/pull/3