486 lines
13 KiB
C
486 lines
13 KiB
C
/* $FreeBSD$ */
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/* $KAME: rijndael-api-fst.c,v 1.10 2001/05/27 09:34:18 itojun Exp $ */
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/*
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* rijndael-api-fst.c v2.3 April '2000
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*
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* Optimised ANSI C code
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*
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* authors: v1.0: Antoon Bosselaers
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* v2.0: Vincent Rijmen
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* v2.1: Vincent Rijmen
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* v2.2: Vincent Rijmen
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* v2.3: Paulo Barreto
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* v2.4: Vincent Rijmen
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*
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* This code is placed in the public domain.
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#ifdef _KERNEL
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#include <sys/systm.h>
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#else
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#include <string.h>
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#endif
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#include <crypto/rijndael/rijndael-alg-fst.h>
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#include <crypto/rijndael/rijndael-api-fst.h>
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#include <crypto/rijndael/rijndael_local.h>
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int rijndael_makeKey(keyInstance *key, BYTE direction, int keyLen, char *keyMaterial) {
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word8 k[MAXKC][4];
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int i;
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char *keyMat;
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if (key == NULL) {
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return BAD_KEY_INSTANCE;
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}
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if ((direction == DIR_ENCRYPT) || (direction == DIR_DECRYPT)) {
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key->direction = direction;
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} else {
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return BAD_KEY_DIR;
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}
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if ((keyLen == 128) || (keyLen == 192) || (keyLen == 256)) {
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key->keyLen = keyLen;
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} else {
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return BAD_KEY_MAT;
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}
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if (keyMaterial != NULL) {
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bcopy(keyMaterial, key->keyMaterial, keyLen/8);
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}
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key->ROUNDS = keyLen/32 + 6;
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/* initialize key schedule: */
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keyMat = key->keyMaterial;
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for (i = 0; i < key->keyLen/8; i++) {
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k[i >> 2][i & 3] = (word8)keyMat[i];
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}
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rijndaelKeySched(k, key->keySched, key->ROUNDS);
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if (direction == DIR_DECRYPT) {
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rijndaelKeyEncToDec(key->keySched, key->ROUNDS);
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}
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return TRUE;
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}
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int rijndael_cipherInit(cipherInstance *cipher, BYTE mode, char *IV) {
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if ((mode == MODE_ECB) || (mode == MODE_CBC) || (mode == MODE_CFB1)) {
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cipher->mode = mode;
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} else {
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return BAD_CIPHER_MODE;
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}
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if (IV != NULL) {
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bcopy(IV, cipher->IV, MAX_IV_SIZE);
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} else {
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bzero(cipher->IV, MAX_IV_SIZE);
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}
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return TRUE;
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}
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int rijndael_blockEncrypt(cipherInstance *cipher, keyInstance *key,
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BYTE *input, int inputLen, BYTE *outBuffer) {
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int i, k, numBlocks;
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word8 block[16], iv[4][4];
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if (cipher == NULL ||
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key == NULL ||
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key->direction == DIR_DECRYPT) {
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return BAD_CIPHER_STATE;
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}
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if (input == NULL || inputLen <= 0) {
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return 0; /* nothing to do */
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}
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numBlocks = inputLen/128;
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switch (cipher->mode) {
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case MODE_ECB:
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for (i = numBlocks; i > 0; i--) {
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rijndaelEncrypt(input, outBuffer, key->keySched, key->ROUNDS);
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input += 16;
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outBuffer += 16;
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}
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break;
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case MODE_CBC:
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#if 1 /*STRICT_ALIGN*/
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bcopy(cipher->IV, block, 16);
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bcopy(input, iv, 16);
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((word32*)block)[0] ^= ((word32*)iv)[0];
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((word32*)block)[1] ^= ((word32*)iv)[1];
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((word32*)block)[2] ^= ((word32*)iv)[2];
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((word32*)block)[3] ^= ((word32*)iv)[3];
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#else
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((word32*)block)[0] = ((word32*)cipher->IV)[0] ^ ((word32*)input)[0];
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((word32*)block)[1] = ((word32*)cipher->IV)[1] ^ ((word32*)input)[1];
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((word32*)block)[2] = ((word32*)cipher->IV)[2] ^ ((word32*)input)[2];
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((word32*)block)[3] = ((word32*)cipher->IV)[3] ^ ((word32*)input)[3];
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#endif
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rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS);
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input += 16;
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for (i = numBlocks - 1; i > 0; i--) {
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#if 1 /*STRICT_ALIGN*/
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bcopy(outBuffer, block, 16);
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bcopy(input, iv, 16);
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((word32*)block)[0] ^= ((word32*)iv)[0];
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((word32*)block)[1] ^= ((word32*)iv)[1];
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((word32*)block)[2] ^= ((word32*)iv)[2];
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((word32*)block)[3] ^= ((word32*)iv)[3];
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#else
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((word32*)block)[0] = ((word32*)outBuffer)[0] ^ ((word32*)input)[0];
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((word32*)block)[1] = ((word32*)outBuffer)[1] ^ ((word32*)input)[1];
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((word32*)block)[2] = ((word32*)outBuffer)[2] ^ ((word32*)input)[2];
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((word32*)block)[3] = ((word32*)outBuffer)[3] ^ ((word32*)input)[3];
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#endif
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outBuffer += 16;
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rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS);
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input += 16;
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}
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break;
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case MODE_CFB1:
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#if 1 /*STRICT_ALIGN*/
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bcopy(cipher->IV, iv, 16);
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#else /* !STRICT_ALIGN */
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*((word32*)iv[0]) = *((word32*)(cipher->IV ));
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*((word32*)iv[1]) = *((word32*)(cipher->IV+ 4));
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*((word32*)iv[2]) = *((word32*)(cipher->IV+ 8));
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*((word32*)iv[3]) = *((word32*)(cipher->IV+12));
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#endif /* ?STRICT_ALIGN */
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for (i = numBlocks; i > 0; i--) {
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for (k = 0; k < 128; k++) {
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*((word32*) block ) = *((word32*)iv[0]);
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*((word32*)(block+ 4)) = *((word32*)iv[1]);
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*((word32*)(block+ 8)) = *((word32*)iv[2]);
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*((word32*)(block+12)) = *((word32*)iv[3]);
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rijndaelEncrypt(block, block, key->keySched, key->ROUNDS);
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outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
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iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
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iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
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iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
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iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
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iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
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iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
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iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
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iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
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iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
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iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
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iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
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iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
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iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
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iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
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iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
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iv[3][3] = (iv[3][3] << 1) | ((outBuffer[k/8] >> (7-(k&7))) & 1);
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}
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}
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break;
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default:
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return BAD_CIPHER_STATE;
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}
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return 128*numBlocks;
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}
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/**
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* Encrypt data partitioned in octets, using RFC 2040-like padding.
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*
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* @param input data to be encrypted (octet sequence)
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* @param inputOctets input length in octets (not bits)
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* @param outBuffer encrypted output data
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*
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* @return length in octets (not bits) of the encrypted output buffer.
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*/
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int rijndael_padEncrypt(cipherInstance *cipher, keyInstance *key,
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BYTE *input, int inputOctets, BYTE *outBuffer) {
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int i, numBlocks, padLen;
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word8 block[16], *iv, *cp;
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if (cipher == NULL ||
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key == NULL ||
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key->direction == DIR_DECRYPT) {
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return BAD_CIPHER_STATE;
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}
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if (input == NULL || inputOctets <= 0) {
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return 0; /* nothing to do */
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}
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numBlocks = inputOctets/16;
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switch (cipher->mode) {
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case MODE_ECB:
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for (i = numBlocks; i > 0; i--) {
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rijndaelEncrypt(input, outBuffer, key->keySched, key->ROUNDS);
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input += 16;
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outBuffer += 16;
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}
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padLen = 16 - (inputOctets - 16*numBlocks);
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if (padLen > 0 && padLen <= 16)
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panic("rijndael_padEncrypt(ECB)");
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bcopy(input, block, 16 - padLen);
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for (cp = block + 16 - padLen; cp < block + 16; cp++)
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*cp = padLen;
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rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS);
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break;
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case MODE_CBC:
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iv = cipher->IV;
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for (i = numBlocks; i > 0; i--) {
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((word32*)block)[0] = ((word32*)input)[0] ^ ((word32*)iv)[0];
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((word32*)block)[1] = ((word32*)input)[1] ^ ((word32*)iv)[1];
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((word32*)block)[2] = ((word32*)input)[2] ^ ((word32*)iv)[2];
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((word32*)block)[3] = ((word32*)input)[3] ^ ((word32*)iv)[3];
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rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS);
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iv = outBuffer;
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input += 16;
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outBuffer += 16;
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}
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padLen = 16 - (inputOctets - 16*numBlocks);
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if (padLen > 0 && padLen <= 16)
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panic("rijndael_padEncrypt(CBC)");
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for (i = 0; i < 16 - padLen; i++) {
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block[i] = input[i] ^ iv[i];
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}
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for (i = 16 - padLen; i < 16; i++) {
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block[i] = (BYTE)padLen ^ iv[i];
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}
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rijndaelEncrypt(block, outBuffer, key->keySched, key->ROUNDS);
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break;
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default:
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return BAD_CIPHER_STATE;
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}
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return 16*(numBlocks + 1);
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}
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int rijndael_blockDecrypt(cipherInstance *cipher, keyInstance *key,
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BYTE *input, int inputLen, BYTE *outBuffer) {
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int i, k, numBlocks;
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word8 block[16], iv[4][4];
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if (cipher == NULL ||
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key == NULL ||
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(cipher->mode != MODE_CFB1 && key->direction == DIR_ENCRYPT)) {
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return BAD_CIPHER_STATE;
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}
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if (input == NULL || inputLen <= 0) {
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return 0; /* nothing to do */
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}
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numBlocks = inputLen/128;
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switch (cipher->mode) {
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case MODE_ECB:
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for (i = numBlocks; i > 0; i--) {
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rijndaelDecrypt(input, outBuffer, key->keySched, key->ROUNDS);
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input += 16;
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outBuffer += 16;
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}
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break;
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case MODE_CBC:
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#if 1 /*STRICT_ALIGN */
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bcopy(cipher->IV, iv, 16);
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#else
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*((word32*)iv[0]) = *((word32*)(cipher->IV ));
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*((word32*)iv[1]) = *((word32*)(cipher->IV+ 4));
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*((word32*)iv[2]) = *((word32*)(cipher->IV+ 8));
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*((word32*)iv[3]) = *((word32*)(cipher->IV+12));
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#endif
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for (i = numBlocks; i > 0; i--) {
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rijndaelDecrypt(input, block, key->keySched, key->ROUNDS);
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((word32*)block)[0] ^= *((word32*)iv[0]);
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((word32*)block)[1] ^= *((word32*)iv[1]);
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((word32*)block)[2] ^= *((word32*)iv[2]);
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((word32*)block)[3] ^= *((word32*)iv[3]);
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#if 1 /*STRICT_ALIGN*/
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bcopy(input, iv, 16);
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bcopy(block, outBuffer, 16);
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#else
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*((word32*)iv[0]) = ((word32*)input)[0]; ((word32*)outBuffer)[0] = ((word32*)block)[0];
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*((word32*)iv[1]) = ((word32*)input)[1]; ((word32*)outBuffer)[1] = ((word32*)block)[1];
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*((word32*)iv[2]) = ((word32*)input)[2]; ((word32*)outBuffer)[2] = ((word32*)block)[2];
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*((word32*)iv[3]) = ((word32*)input)[3]; ((word32*)outBuffer)[3] = ((word32*)block)[3];
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#endif
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input += 16;
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outBuffer += 16;
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}
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break;
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case MODE_CFB1:
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#if 1 /*STRICT_ALIGN */
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bcopy(cipher->IV, iv, 16);
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#else
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*((word32*)iv[0]) = *((word32*)(cipher->IV));
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*((word32*)iv[1]) = *((word32*)(cipher->IV+ 4));
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*((word32*)iv[2]) = *((word32*)(cipher->IV+ 8));
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*((word32*)iv[3]) = *((word32*)(cipher->IV+12));
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#endif
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for (i = numBlocks; i > 0; i--) {
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for (k = 0; k < 128; k++) {
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*((word32*) block ) = *((word32*)iv[0]);
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*((word32*)(block+ 4)) = *((word32*)iv[1]);
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*((word32*)(block+ 8)) = *((word32*)iv[2]);
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*((word32*)(block+12)) = *((word32*)iv[3]);
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rijndaelEncrypt(block, block, key->keySched, key->ROUNDS);
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iv[0][0] = (iv[0][0] << 1) | (iv[0][1] >> 7);
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iv[0][1] = (iv[0][1] << 1) | (iv[0][2] >> 7);
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iv[0][2] = (iv[0][2] << 1) | (iv[0][3] >> 7);
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iv[0][3] = (iv[0][3] << 1) | (iv[1][0] >> 7);
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iv[1][0] = (iv[1][0] << 1) | (iv[1][1] >> 7);
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iv[1][1] = (iv[1][1] << 1) | (iv[1][2] >> 7);
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iv[1][2] = (iv[1][2] << 1) | (iv[1][3] >> 7);
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iv[1][3] = (iv[1][3] << 1) | (iv[2][0] >> 7);
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iv[2][0] = (iv[2][0] << 1) | (iv[2][1] >> 7);
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iv[2][1] = (iv[2][1] << 1) | (iv[2][2] >> 7);
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iv[2][2] = (iv[2][2] << 1) | (iv[2][3] >> 7);
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iv[2][3] = (iv[2][3] << 1) | (iv[3][0] >> 7);
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iv[3][0] = (iv[3][0] << 1) | (iv[3][1] >> 7);
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iv[3][1] = (iv[3][1] << 1) | (iv[3][2] >> 7);
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iv[3][2] = (iv[3][2] << 1) | (iv[3][3] >> 7);
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iv[3][3] = (iv[3][3] << 1) | ((input[k/8] >> (7-(k&7))) & 1);
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outBuffer[k/8] ^= (block[0] & 0x80) >> (k & 7);
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}
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}
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break;
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default:
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return BAD_CIPHER_STATE;
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}
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return 128*numBlocks;
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}
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int rijndael_padDecrypt(cipherInstance *cipher, keyInstance *key,
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BYTE *input, int inputOctets, BYTE *outBuffer) {
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int i, numBlocks, padLen;
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word8 block[16];
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word32 iv[4];
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if (cipher == NULL ||
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key == NULL ||
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key->direction == DIR_ENCRYPT) {
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return BAD_CIPHER_STATE;
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}
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if (input == NULL || inputOctets <= 0) {
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return 0; /* nothing to do */
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}
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if (inputOctets % 16 != 0) {
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return BAD_DATA;
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}
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numBlocks = inputOctets/16;
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switch (cipher->mode) {
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case MODE_ECB:
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/* all blocks but last */
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for (i = numBlocks - 1; i > 0; i--) {
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rijndaelDecrypt(input, outBuffer, key->keySched, key->ROUNDS);
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input += 16;
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outBuffer += 16;
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}
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/* last block */
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rijndaelDecrypt(input, block, key->keySched, key->ROUNDS);
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padLen = block[15];
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if (padLen >= 16) {
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return BAD_DATA;
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}
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for (i = 16 - padLen; i < 16; i++) {
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if (block[i] != padLen) {
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return BAD_DATA;
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}
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}
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bcopy(block, outBuffer, 16 - padLen);
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break;
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case MODE_CBC:
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bcopy(cipher->IV, iv, 16);
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/* all blocks but last */
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for (i = numBlocks - 1; i > 0; i--) {
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rijndaelDecrypt(input, block, key->keySched, key->ROUNDS);
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((word32*)block)[0] ^= iv[0];
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((word32*)block)[1] ^= iv[1];
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((word32*)block)[2] ^= iv[2];
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((word32*)block)[3] ^= iv[3];
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bcopy(input, iv, 16);
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bcopy(block, outBuffer, 16);
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input += 16;
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outBuffer += 16;
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}
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/* last block */
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rijndaelDecrypt(input, block, key->keySched, key->ROUNDS);
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((word32*)block)[0] ^= iv[0];
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((word32*)block)[1] ^= iv[1];
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((word32*)block)[2] ^= iv[2];
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((word32*)block)[3] ^= iv[3];
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padLen = block[15];
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if (padLen <= 0 || padLen > 16) {
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return BAD_DATA;
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}
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for (i = 16 - padLen; i < 16; i++) {
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if (block[i] != padLen) {
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return BAD_DATA;
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}
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}
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bcopy(block, outBuffer, 16 - padLen);
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break;
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default:
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return BAD_CIPHER_STATE;
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}
|
|
|
|
return 16*numBlocks - padLen;
|
|
}
|
|
|
|
#ifdef INTERMEDIATE_VALUE_KAT
|
|
/**
|
|
* cipherUpdateRounds:
|
|
*
|
|
* Encrypts/Decrypts exactly one full block a specified number of rounds.
|
|
* Only used in the Intermediate Value Known Answer Test.
|
|
*
|
|
* Returns:
|
|
* TRUE - on success
|
|
* BAD_CIPHER_STATE - cipher in bad state (e.g., not initialized)
|
|
*/
|
|
int rijndael_cipherUpdateRounds(cipherInstance *cipher, keyInstance *key,
|
|
BYTE *input, int inputLen, BYTE *outBuffer, int rounds) {
|
|
int j;
|
|
word8 block[4][4];
|
|
|
|
if (cipher == NULL || key == NULL) {
|
|
return BAD_CIPHER_STATE;
|
|
}
|
|
|
|
for (j = 3; j >= 0; j--) {
|
|
/* parse input stream into rectangular array */
|
|
*((word32*)block[j]) = *((word32*)(input+4*j));
|
|
}
|
|
|
|
switch (key->direction) {
|
|
case DIR_ENCRYPT:
|
|
rijndaelEncryptRound(block, key->keySched, key->ROUNDS, rounds);
|
|
break;
|
|
|
|
case DIR_DECRYPT:
|
|
rijndaelDecryptRound(block, key->keySched, key->ROUNDS, rounds);
|
|
break;
|
|
|
|
default:
|
|
return BAD_KEY_DIR;
|
|
}
|
|
|
|
for (j = 3; j >= 0; j--) {
|
|
/* parse rectangular array into output ciphertext bytes */
|
|
*((word32*)(outBuffer+4*j)) = *((word32*)block[j]);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
#endif /* INTERMEDIATE_VALUE_KAT */
|