Andrew Boyson / crypto

A simple library to support serving https.

Dependents:   oldheating gps motorhome heating

aes-gcm/aes.h@6:819c17738dc2, 2019-09-01 (annotated)

Committer:
andrewboyson
Date:
Sun Sep 01 18:15:12 2019 +0000
Revision:
6:819c17738dc2
Making progress - now have decryption working.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 6:819c17738dc2 1 /******************************************************************************
andrewboyson 6:819c17738dc2 2 *
andrewboyson 6:819c17738dc2 3 * THIS SOURCE CODE IS HEREBY PLACED INTO THE PUBLIC DOMAIN FOR THE GOOD OF ALL
andrewboyson 6:819c17738dc2 4 *
andrewboyson 6:819c17738dc2 5 * This is a simple and straightforward implementation of the AES Rijndael
andrewboyson 6:819c17738dc2 6 * 128-bit block cipher designed by Vincent Rijmen and Joan Daemen. The focus
andrewboyson 6:819c17738dc2 7 * of this work was correctness & accuracy. It is written in 'C' without any
andrewboyson 6:819c17738dc2 8 * particular focus upon optimization or speed. It should be endian (memory
andrewboyson 6:819c17738dc2 9 * byte order) neutral since the few places that care are handled explicitly.
andrewboyson 6:819c17738dc2 10 *
andrewboyson 6:819c17738dc2 11 * This implementation of Rijndael was created by Steven M. Gibson of GRC.com.
andrewboyson 6:819c17738dc2 12 *
andrewboyson 6:819c17738dc2 13 * It is intended for general purpose use, but was written in support of GRC's
andrewboyson 6:819c17738dc2 14 * reference implementation of the SQRL (Secure Quick Reliable Login) client.
andrewboyson 6:819c17738dc2 15 *
andrewboyson 6:819c17738dc2 16 * See: http://csrc.nist.gov/archive/aes/rijndael/wsdindex.html
andrewboyson 6:819c17738dc2 17 *
andrewboyson 6:819c17738dc2 18 * NO COPYRIGHT IS CLAIMED IN THIS WORK, HOWEVER, NEITHER IS ANY WARRANTY MADE
andrewboyson 6:819c17738dc2 19 * REGARDING ITS FITNESS FOR ANY PARTICULAR PURPOSE. USE IT AT YOUR OWN RISK.
andrewboyson 6:819c17738dc2 20 *
andrewboyson 6:819c17738dc2 21 *******************************************************************************/
andrewboyson 6:819c17738dc2 22
andrewboyson 6:819c17738dc2 23 #ifndef AES_HEADER
andrewboyson 6:819c17738dc2 24 #define AES_HEADER
andrewboyson 6:819c17738dc2 25
andrewboyson 6:819c17738dc2 26 /******************************************************************************/
andrewboyson 6:819c17738dc2 27 #define AES_DECRYPTION 0 // whether AES decryption is supported
andrewboyson 6:819c17738dc2 28 /******************************************************************************/
andrewboyson 6:819c17738dc2 29
andrewboyson 6:819c17738dc2 30 #include <string.h>
andrewboyson 6:819c17738dc2 31
andrewboyson 6:819c17738dc2 32 #define ENCRYPT 1 // specify whether we're encrypting
andrewboyson 6:819c17738dc2 33 #define DECRYPT 0 // or decrypting
andrewboyson 6:819c17738dc2 34
andrewboyson 6:819c17738dc2 35 #if defined(_MSC_VER)
andrewboyson 6:819c17738dc2 36 #include <basetsd.h>
andrewboyson 6:819c17738dc2 37 typedef UINT32 uint32_t;
andrewboyson 6:819c17738dc2 38 #else
andrewboyson 6:819c17738dc2 39 #include <inttypes.h>
andrewboyson 6:819c17738dc2 40 #endif
andrewboyson 6:819c17738dc2 41
andrewboyson 6:819c17738dc2 42 typedef unsigned char uchar; // add some convienent shorter types
andrewboyson 6:819c17738dc2 43 typedef unsigned int uint;
andrewboyson 6:819c17738dc2 44
andrewboyson 6:819c17738dc2 45
andrewboyson 6:819c17738dc2 46 /******************************************************************************
andrewboyson 6:819c17738dc2 47 * AES_INIT_KEYGEN_TABLES : MUST be called once before any AES use
andrewboyson 6:819c17738dc2 48 ******************************************************************************/
andrewboyson 6:819c17738dc2 49 void aes_init_keygen_tables( void );
andrewboyson 6:819c17738dc2 50
andrewboyson 6:819c17738dc2 51
andrewboyson 6:819c17738dc2 52 /******************************************************************************
andrewboyson 6:819c17738dc2 53 * AES_CONTEXT : cipher context / holds inter-call data
andrewboyson 6:819c17738dc2 54 ******************************************************************************/
andrewboyson 6:819c17738dc2 55 typedef struct {
andrewboyson 6:819c17738dc2 56 int mode; // 1 for Encryption, 0 for Decryption
andrewboyson 6:819c17738dc2 57 int rounds; // keysize-based rounds count
andrewboyson 6:819c17738dc2 58 uint32_t *rk; // pointer to current round key
andrewboyson 6:819c17738dc2 59 uint32_t buf[68]; // key expansion buffer
andrewboyson 6:819c17738dc2 60 } aes_context;
andrewboyson 6:819c17738dc2 61
andrewboyson 6:819c17738dc2 62
andrewboyson 6:819c17738dc2 63 /******************************************************************************
andrewboyson 6:819c17738dc2 64 * AES_SETKEY : called to expand the key for encryption or decryption
andrewboyson 6:819c17738dc2 65 ******************************************************************************/
andrewboyson 6:819c17738dc2 66 int aes_setkey( aes_context *ctx, // pointer to context
andrewboyson 6:819c17738dc2 67 int mode, // 1 or 0 for Encrypt/Decrypt
andrewboyson 6:819c17738dc2 68 const uchar *key, // AES input key
andrewboyson 6:819c17738dc2 69 uint keysize ); // 128, 192 or 256 bits
andrewboyson 6:819c17738dc2 70 // returns 0 for success
andrewboyson 6:819c17738dc2 71
andrewboyson 6:819c17738dc2 72 /******************************************************************************
andrewboyson 6:819c17738dc2 73 * AES_CIPHER : called to encrypt or decrypt ONE 128-bit block of data
andrewboyson 6:819c17738dc2 74 ******************************************************************************/
andrewboyson 6:819c17738dc2 75 int aes_cipher( aes_context *ctx, // pointer to context
andrewboyson 6:819c17738dc2 76 const uchar input[16], // 128-bit block to en/decipher
andrewboyson 6:819c17738dc2 77 uchar output[16] ); // 128-bit output result block
andrewboyson 6:819c17738dc2 78 // returns 0 for success
andrewboyson 6:819c17738dc2 79
andrewboyson 6:819c17738dc2 80 #endif /* AES_HEADER */