443 lines
13 KiB
C
443 lines
13 KiB
C
/* $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/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.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_local.h>
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#include <crypto/rijndael/rijndael-api-fst.h>
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#ifndef TRUE
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#define TRUE 1
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#endif
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typedef u_int8_t BYTE;
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int rijndael_makeKey(keyInstance *key, BYTE direction, int keyLen,
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const char *keyMaterial) {
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u_int8_t cipherKey[RIJNDAEL_MAXKB];
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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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memcpy(key->keyMaterial, keyMaterial, keyLen/8);
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}
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/* initialize key schedule: */
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memcpy(cipherKey, key->keyMaterial, keyLen/8);
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if (direction == DIR_ENCRYPT) {
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key->Nr = rijndaelKeySetupEnc(key->rk, cipherKey, keyLen);
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} else {
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key->Nr = rijndaelKeySetupDec(key->rk, cipherKey, keyLen);
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}
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rijndaelKeySetupEnc(key->ek, cipherKey, keyLen);
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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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memcpy(cipher->IV, IV, RIJNDAEL_MAX_IV_SIZE);
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} else {
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memset(cipher->IV, 0, RIJNDAEL_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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const BYTE *input, int inputLen, BYTE *outBuffer) {
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int i, k, numBlocks;
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u_int8_t 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(key->rk, key->Nr, input, outBuffer);
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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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memcpy(block, cipher->IV, 16);
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memcpy(iv, input, 16);
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((u_int32_t*)block)[0] ^= ((u_int32_t*)iv)[0];
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((u_int32_t*)block)[1] ^= ((u_int32_t*)iv)[1];
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((u_int32_t*)block)[2] ^= ((u_int32_t*)iv)[2];
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((u_int32_t*)block)[3] ^= ((u_int32_t*)iv)[3];
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#else
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((u_int32_t*)block)[0] = ((u_int32_t*)cipher->IV)[0] ^ ((u_int32_t*)input)[0];
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((u_int32_t*)block)[1] = ((u_int32_t*)cipher->IV)[1] ^ ((u_int32_t*)input)[1];
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((u_int32_t*)block)[2] = ((u_int32_t*)cipher->IV)[2] ^ ((u_int32_t*)input)[2];
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((u_int32_t*)block)[3] = ((u_int32_t*)cipher->IV)[3] ^ ((u_int32_t*)input)[3];
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#endif
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rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
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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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memcpy(block, outBuffer, 16);
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memcpy(iv, input, 16);
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((u_int32_t*)block)[0] ^= ((u_int32_t*)iv)[0];
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((u_int32_t*)block)[1] ^= ((u_int32_t*)iv)[1];
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((u_int32_t*)block)[2] ^= ((u_int32_t*)iv)[2];
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((u_int32_t*)block)[3] ^= ((u_int32_t*)iv)[3];
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#else
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((u_int32_t*)block)[0] = ((u_int32_t*)outBuffer)[0] ^ ((u_int32_t*)input)[0];
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((u_int32_t*)block)[1] = ((u_int32_t*)outBuffer)[1] ^ ((u_int32_t*)input)[1];
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((u_int32_t*)block)[2] = ((u_int32_t*)outBuffer)[2] ^ ((u_int32_t*)input)[2];
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((u_int32_t*)block)[3] = ((u_int32_t*)outBuffer)[3] ^ ((u_int32_t*)input)[3];
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#endif
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outBuffer += 16;
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rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
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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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memcpy(iv, cipher->IV, 16);
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#else /* !STRICT_ALIGN */
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*((u_int32_t*)iv[0]) = *((u_int32_t*)(cipher->IV ));
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*((u_int32_t*)iv[1]) = *((u_int32_t*)(cipher->IV+ 4));
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*((u_int32_t*)iv[2]) = *((u_int32_t*)(cipher->IV+ 8));
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*((u_int32_t*)iv[3]) = *((u_int32_t*)(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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*((u_int32_t*) block ) = *((u_int32_t*)iv[0]);
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*((u_int32_t*)(block+ 4)) = *((u_int32_t*)iv[1]);
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*((u_int32_t*)(block+ 8)) = *((u_int32_t*)iv[2]);
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*((u_int32_t*)(block+12)) = *((u_int32_t*)iv[3]);
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rijndaelEncrypt(key->ek, key->Nr, block,
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block);
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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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const BYTE *input, int inputOctets, BYTE *outBuffer) {
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int i, numBlocks, padLen;
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u_int8_t 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(key->rk, key->Nr, input, 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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return BAD_CIPHER_STATE;
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memcpy(block, input, 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(key->rk, key->Nr, block, outBuffer);
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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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((u_int32_t*)block)[0] = ((const u_int32_t*)input)[0] ^ ((u_int32_t*)iv)[0];
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((u_int32_t*)block)[1] = ((const u_int32_t*)input)[1] ^ ((u_int32_t*)iv)[1];
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((u_int32_t*)block)[2] = ((const u_int32_t*)input)[2] ^ ((u_int32_t*)iv)[2];
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((u_int32_t*)block)[3] = ((const u_int32_t*)input)[3] ^ ((u_int32_t*)iv)[3];
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rijndaelEncrypt(key->rk, key->Nr, block, outBuffer);
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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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return BAD_CIPHER_STATE;
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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(key->rk, key->Nr, block, outBuffer);
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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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const BYTE *input, int inputLen, BYTE *outBuffer) {
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int i, k, numBlocks;
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u_int8_t 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(key->rk, key->Nr, input, outBuffer);
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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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memcpy(iv, cipher->IV, 16);
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#else
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*((u_int32_t*)iv[0]) = *((u_int32_t*)(cipher->IV ));
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*((u_int32_t*)iv[1]) = *((u_int32_t*)(cipher->IV+ 4));
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*((u_int32_t*)iv[2]) = *((u_int32_t*)(cipher->IV+ 8));
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*((u_int32_t*)iv[3]) = *((u_int32_t*)(cipher->IV+12));
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#endif
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for (i = numBlocks; i > 0; i--) {
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rijndaelDecrypt(key->rk, key->Nr, input, block);
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((u_int32_t*)block)[0] ^= *((u_int32_t*)iv[0]);
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((u_int32_t*)block)[1] ^= *((u_int32_t*)iv[1]);
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((u_int32_t*)block)[2] ^= *((u_int32_t*)iv[2]);
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((u_int32_t*)block)[3] ^= *((u_int32_t*)iv[3]);
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#if 1 /*STRICT_ALIGN*/
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memcpy(iv, input, 16);
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memcpy(outBuffer, block, 16);
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#else
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*((u_int32_t*)iv[0]) = ((u_int32_t*)input)[0]; ((u_int32_t*)outBuffer)[0] = ((u_int32_t*)block)[0];
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*((u_int32_t*)iv[1]) = ((u_int32_t*)input)[1]; ((u_int32_t*)outBuffer)[1] = ((u_int32_t*)block)[1];
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*((u_int32_t*)iv[2]) = ((u_int32_t*)input)[2]; ((u_int32_t*)outBuffer)[2] = ((u_int32_t*)block)[2];
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*((u_int32_t*)iv[3]) = ((u_int32_t*)input)[3]; ((u_int32_t*)outBuffer)[3] = ((u_int32_t*)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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memcpy(iv, cipher->IV, 16);
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#else
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*((u_int32_t*)iv[0]) = *((u_int32_t*)(cipher->IV));
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*((u_int32_t*)iv[1]) = *((u_int32_t*)(cipher->IV+ 4));
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*((u_int32_t*)iv[2]) = *((u_int32_t*)(cipher->IV+ 8));
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*((u_int32_t*)iv[3]) = *((u_int32_t*)(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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*((u_int32_t*) block ) = *((u_int32_t*)iv[0]);
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*((u_int32_t*)(block+ 4)) = *((u_int32_t*)iv[1]);
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*((u_int32_t*)(block+ 8)) = *((u_int32_t*)iv[2]);
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*((u_int32_t*)(block+12)) = *((u_int32_t*)iv[3]);
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rijndaelEncrypt(key->ek, key->Nr, block,
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block);
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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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const BYTE *input, int inputOctets, BYTE *outBuffer) {
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int i, numBlocks, padLen;
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u_int8_t block[16];
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u_int32_t 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(key->rk, key->Nr, input, outBuffer);
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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(key->rk, key->Nr, input, block);
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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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memcpy(outBuffer, block, 16 - padLen);
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break;
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case MODE_CBC:
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memcpy(iv, cipher->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(key->rk, key->Nr, input, block);
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((u_int32_t*)block)[0] ^= iv[0];
|
|
((u_int32_t*)block)[1] ^= iv[1];
|
|
((u_int32_t*)block)[2] ^= iv[2];
|
|
((u_int32_t*)block)[3] ^= iv[3];
|
|
memcpy(iv, input, 16);
|
|
memcpy(outBuffer, block, 16);
|
|
input += 16;
|
|
outBuffer += 16;
|
|
}
|
|
/* last block */
|
|
rijndaelDecrypt(key->rk, key->Nr, input, block);
|
|
((u_int32_t*)block)[0] ^= iv[0];
|
|
((u_int32_t*)block)[1] ^= iv[1];
|
|
((u_int32_t*)block)[2] ^= iv[2];
|
|
((u_int32_t*)block)[3] ^= iv[3];
|
|
padLen = block[15];
|
|
if (padLen <= 0 || padLen > 16) {
|
|
return BAD_DATA;
|
|
}
|
|
for (i = 16 - padLen; i < 16; i++) {
|
|
if (block[i] != padLen) {
|
|
return BAD_DATA;
|
|
}
|
|
}
|
|
memcpy(outBuffer, block, 16 - padLen);
|
|
break;
|
|
|
|
default:
|
|
return BAD_CIPHER_STATE;
|
|
}
|
|
|
|
return 16*numBlocks - padLen;
|
|
}
|