static krb5_error_code
validate_and_schedule(krb5_key key, const krb5_data *ivec,
const krb5_crypto_iov *data, size_t num_data,
mit_des_key_schedule schedule)
{
size_t i, input_length;
for (i = 0, input_length = 0; i < num_data; i++) {
const krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_IOV(iov))
input_length += iov->data.length;
}
if (key->keyblock.length != 8)
return KRB5_BAD_KEYSIZE;
if (input_length % 8 != 0 || (ivec != NULL && ivec->length != 8))
return KRB5_BAD_MSIZE;
switch (mit_des_key_sched(key->keyblock.contents, schedule)) {
case -1:
return(KRB5DES_BAD_KEYPAR);
case -2:
return(KRB5DES_WEAK_KEY);
}
return 0;
}
krb5_error_code
krb5int_aes_decrypt(krb5_key key, const krb5_data *ivec,
krb5_crypto_iov *data, size_t num_data)
{
int ret = 0;
int nblocks = 0;
size_t input_length, i;
for (i = 0, input_length = 0; i < num_data; i++) {
krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_IOV(iov))
input_length += iov->data.length;
}
nblocks = (input_length + BLOCK_SIZE - 1) / BLOCK_SIZE;
if (nblocks == 1) {
if (input_length != BLOCK_SIZE)
return KRB5_BAD_MSIZE;
ret = cbc_decr(key, ivec, data, num_data);
} else if (nblocks > 1) {
ret = cts_decr(key, ivec, data, num_data, input_length);
}
return ret;
}
/* In-place encryption */
static krb5_error_code
k5_arcfour_docrypt_iov(const krb5_keyblock *key,
const krb5_data *state,
krb5_crypto_iov *data,
size_t num_data)
{
ArcfourContext *arcfour_ctx = NULL;
ArcFourCipherState *cipher_state = NULL;
krb5_error_code ret;
size_t i;
if (key->length != 16)
return KRB5_BAD_KEYSIZE;
if (state != NULL && (state->length != sizeof(ArcFourCipherState)))
return KRB5_BAD_MSIZE;
if (state != NULL) {
cipher_state = (ArcFourCipherState *)state->data;
arcfour_ctx = &cipher_state->ctx;
if (cipher_state->initialized == 0) {
ret = k5_arcfour_init(arcfour_ctx, key->contents, key->length);
if (ret != 0)
return ret;
cipher_state->initialized = 1;
}
} else {
arcfour_ctx = (ArcfourContext *)malloc(sizeof(ArcfourContext));
if (arcfour_ctx == NULL)
return ENOMEM;
ret = k5_arcfour_init(arcfour_ctx, key->contents, key->length);
if (ret != 0) {
free(arcfour_ctx);
return ret;
}
}
for (i = 0; i < num_data; i++) {
krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_IOV(iov))
k5_arcfour_crypt(arcfour_ctx, (unsigned char *)iov->data.data,
(const unsigned char *)iov->data.data, iov->data.length);
}
if (state == NULL) {
memset(arcfour_ctx, 0, sizeof(ArcfourContext));
free(arcfour_ctx);
}
return 0;
}
static krb5_error_code
validate(krb5_key key, const krb5_data *ivec, const krb5_crypto_iov *data,
size_t num_data, krb5_boolean *empty)
{
size_t i, input_length;
for (i = 0, input_length = 0; i < num_data; i++) {
const krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_IOV(iov))
input_length += iov->data.length;
}
if (key->keyblock.length != KRB5_MIT_DES3_KEYSIZE)
return(KRB5_BAD_KEYSIZE);
if ((input_length%DES_BLOCK_SIZE) != 0)
return(KRB5_BAD_MSIZE);
if (ivec && (ivec->length != 8))
return(KRB5_BAD_MSIZE);
*empty = (input_length == 0);
return 0;
}
static krb5_error_code
krb5int_aes_decrypt_iov(const krb5_keyblock *key,
const krb5_data *ivec,
krb5_crypto_iov *data,
size_t num_data)
{
aes_ctx ctx;
char tmp[BLOCK_SIZE], tmp2[BLOCK_SIZE], tmp3[BLOCK_SIZE];
int nblocks = 0, blockno, i;
size_t input_length;
struct iov_block_state input_pos, output_pos;
CHECK_SIZES;
if (aes_dec_key(key->contents, key->length, &ctx) != aes_good)
abort();
if (ivec != NULL)
memcpy(tmp, ivec->data, BLOCK_SIZE);
else
memset(tmp, 0, BLOCK_SIZE);
for (i = 0, input_length = 0; i < num_data; i++) {
krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_IOV(iov))
input_length += iov->data.length;
}
IOV_BLOCK_STATE_INIT(&input_pos);
IOV_BLOCK_STATE_INIT(&output_pos);
nblocks = (input_length + BLOCK_SIZE - 1) / BLOCK_SIZE;
if (nblocks == 1) {
krb5int_c_iov_get_block((unsigned char *)tmp, BLOCK_SIZE,
data, num_data, &input_pos);
dec(tmp2, tmp, &ctx);
krb5int_c_iov_put_block(data, num_data, (unsigned char *)tmp2,
BLOCK_SIZE, &output_pos);
} else if (nblocks > 1) {
char blockN2[BLOCK_SIZE]; /* second last */
char blockN1[BLOCK_SIZE]; /* last block */
for (blockno = 0; blockno < nblocks - 2; blockno++) {
char blockN[BLOCK_SIZE];
krb5int_c_iov_get_block((unsigned char *)blockN, BLOCK_SIZE, data, num_data, &input_pos);
dec(tmp2, blockN, &ctx);
xorblock(tmp2, tmp);
krb5int_c_iov_put_block(data, num_data, (unsigned char *)tmp2, BLOCK_SIZE, &output_pos);
memcpy(tmp, blockN, BLOCK_SIZE);
}
/* Do last two blocks, the second of which (next-to-last block
of plaintext) may be incomplete. */
/* First, get the last two encrypted blocks */
memset(blockN1, 0, sizeof(blockN1)); /* pad last block with zeros */
krb5int_c_iov_get_block((unsigned char *)blockN2, BLOCK_SIZE, data, num_data, &input_pos);
krb5int_c_iov_get_block((unsigned char *)blockN1, BLOCK_SIZE, data, num_data, &input_pos);
/* Decrypt second last block */
dec(tmp2, blockN2, &ctx);
/* Set tmp2 to last (possibly partial) plaintext block, and
save it. */
xorblock(tmp2, blockN1);
memcpy(blockN2, tmp2, BLOCK_SIZE);
/* Maybe keep the trailing part, and copy in the last
ciphertext block. */
input_length %= BLOCK_SIZE;
memcpy(tmp2, blockN1, input_length ? input_length : BLOCK_SIZE);
dec(tmp3, tmp2, &ctx);
xorblock(tmp3, tmp);
/* Copy out ivec first before we clobber blockN1 with plaintext */
if (ivec != NULL)
memcpy(ivec->data, blockN1, BLOCK_SIZE);
memcpy(blockN1, tmp3, BLOCK_SIZE);
/* Put the last two blocks back into the iovec */
krb5int_c_iov_put_block(data, num_data, (unsigned char *)blockN1, BLOCK_SIZE, &output_pos);
krb5int_c_iov_put_block(data, num_data, (unsigned char *)blockN2, BLOCK_SIZE, &output_pos);
}
return 0;
}
static krb5_error_code
krb5int_aes_encrypt_iov(const krb5_keyblock *key,
const krb5_data *ivec,
krb5_crypto_iov *data,
size_t num_data)
{
aes_ctx ctx;
char tmp[BLOCK_SIZE], tmp2[BLOCK_SIZE];
int nblocks = 0, blockno;
size_t input_length, i;
struct iov_block_state input_pos, output_pos;
if (aes_enc_key(key->contents, key->length, &ctx) != aes_good)
abort();
if (ivec != NULL)
memcpy(tmp, ivec->data, BLOCK_SIZE);
else
memset(tmp, 0, BLOCK_SIZE);
for (i = 0, input_length = 0; i < num_data; i++) {
krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_IOV(iov))
input_length += iov->data.length;
}
IOV_BLOCK_STATE_INIT(&input_pos);
IOV_BLOCK_STATE_INIT(&output_pos);
nblocks = (input_length + BLOCK_SIZE - 1) / BLOCK_SIZE;
if (nblocks == 1) {
krb5int_c_iov_get_block((unsigned char *)tmp, BLOCK_SIZE,
data, num_data, &input_pos);
enc(tmp2, tmp, &ctx);
krb5int_c_iov_put_block(data, num_data, (unsigned char *)tmp2,
BLOCK_SIZE, &output_pos);
} else if (nblocks > 1) {
char blockN2[BLOCK_SIZE]; /* second last */
char blockN1[BLOCK_SIZE]; /* last block */
for (blockno = 0; blockno < nblocks - 2; blockno++) {
char blockN[BLOCK_SIZE];
krb5int_c_iov_get_block((unsigned char *)blockN, BLOCK_SIZE, data, num_data, &input_pos);
xorblock(tmp, blockN);
enc(tmp2, tmp, &ctx);
krb5int_c_iov_put_block(data, num_data, (unsigned char *)tmp2, BLOCK_SIZE, &output_pos);
/* Set up for next block. */
memcpy(tmp, tmp2, BLOCK_SIZE);
}
/* Do final CTS step for last two blocks (the second of which
may or may not be incomplete). */
/* First, get the last two blocks */
memset(blockN1, 0, sizeof(blockN1)); /* pad last block with zeros */
krb5int_c_iov_get_block((unsigned char *)blockN2, BLOCK_SIZE, data, num_data, &input_pos);
krb5int_c_iov_get_block((unsigned char *)blockN1, BLOCK_SIZE, data, num_data, &input_pos);
/* Encrypt second last block */
xorblock(tmp, blockN2);
enc(tmp2, tmp, &ctx);
memcpy(blockN2, tmp2, BLOCK_SIZE); /* blockN2 now contains first block */
memcpy(tmp, tmp2, BLOCK_SIZE);
/* Encrypt last block */
xorblock(tmp, blockN1);
enc(tmp2, tmp, &ctx);
memcpy(blockN1, tmp2, BLOCK_SIZE);
/* Put the last two blocks back into the iovec (reverse order) */
krb5int_c_iov_put_block(data, num_data, (unsigned char *)blockN1, BLOCK_SIZE, &output_pos);
krb5int_c_iov_put_block(data, num_data, (unsigned char *)blockN2, BLOCK_SIZE, &output_pos);
if (ivec != NULL)
memcpy(ivec->data, blockN1, BLOCK_SIZE);
}
return 0;
}
static krb5_error_code
krb5int_camellia_encrypt(krb5_key key, const krb5_data *ivec,
krb5_crypto_iov *data, size_t num_data)
{
unsigned char tmp[BLOCK_SIZE], tmp2[BLOCK_SIZE];
int nblocks = 0, blockno;
size_t input_length, i;
struct iov_block_state input_pos, output_pos;
if (key->cache == NULL) {
key->cache = malloc(sizeof(struct camellia_key_info_cache));
if (key->cache == NULL)
return ENOMEM;
CACHE(key)->enc_ctx.keybitlen = CACHE(key)->dec_ctx.keybitlen = 0;
}
if (CACHE(key)->enc_ctx.keybitlen == 0) {
if (camellia_enc_key(key->keyblock.contents, key->keyblock.length,
&CACHE(key)->enc_ctx) != camellia_good)
abort();
}
if (ivec != NULL)
memcpy(tmp, ivec->data, BLOCK_SIZE);
else
memset(tmp, 0, BLOCK_SIZE);
for (i = 0, input_length = 0; i < num_data; i++) {
krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_IOV(iov))
input_length += iov->data.length;
}
IOV_BLOCK_STATE_INIT(&input_pos);
IOV_BLOCK_STATE_INIT(&output_pos);
nblocks = (input_length + BLOCK_SIZE - 1) / BLOCK_SIZE;
if (nblocks == 1) {
krb5int_c_iov_get_block(tmp, BLOCK_SIZE, data, num_data, &input_pos);
enc(tmp2, tmp, &CACHE(key)->enc_ctx);
krb5int_c_iov_put_block(data, num_data, tmp2, BLOCK_SIZE, &output_pos);
} else if (nblocks > 1) {
unsigned char blockN2[BLOCK_SIZE]; /* second last */
unsigned char blockN1[BLOCK_SIZE]; /* last block */
for (blockno = 0; blockno < nblocks - 2; blockno++) {
unsigned char blockN[BLOCK_SIZE], *block;
krb5int_c_iov_get_block_nocopy(blockN, BLOCK_SIZE,
data, num_data, &input_pos, &block);
xorblock(tmp, block);
enc(block, tmp, &CACHE(key)->enc_ctx);
krb5int_c_iov_put_block_nocopy(data, num_data, blockN, BLOCK_SIZE,
&output_pos, block);
/* Set up for next block. */
memcpy(tmp, block, BLOCK_SIZE);
}
/* Do final CTS step for last two blocks (the second of which
may or may not be incomplete). */
/* First, get the last two blocks */
memset(blockN1, 0, sizeof(blockN1)); /* pad last block with zeros */
krb5int_c_iov_get_block(blockN2, BLOCK_SIZE, data, num_data,
&input_pos);
krb5int_c_iov_get_block(blockN1, BLOCK_SIZE, data, num_data,
&input_pos);
/* Encrypt second last block */
xorblock(tmp, blockN2);
enc(tmp2, tmp, &CACHE(key)->enc_ctx);
memcpy(blockN2, tmp2, BLOCK_SIZE); /* blockN2 now contains first block */
memcpy(tmp, tmp2, BLOCK_SIZE);
/* Encrypt last block */
xorblock(tmp, blockN1);
enc(tmp2, tmp, &CACHE(key)->enc_ctx);
memcpy(blockN1, tmp2, BLOCK_SIZE);
/* Put the last two blocks back into the iovec (reverse order) */
krb5int_c_iov_put_block(data, num_data, blockN1, BLOCK_SIZE,
&output_pos);
krb5int_c_iov_put_block(data, num_data, blockN2, BLOCK_SIZE,
&output_pos);
if (ivec != NULL)
memcpy(ivec->data, blockN1, BLOCK_SIZE);
}
return 0;
}
static krb5_error_code
krb5int_camellia_decrypt(krb5_key key, const krb5_data *ivec,
krb5_crypto_iov *data, size_t num_data)
{
unsigned char tmp[BLOCK_SIZE], tmp2[BLOCK_SIZE], tmp3[BLOCK_SIZE];
int nblocks = 0, blockno;
unsigned int i;
size_t input_length;
struct iov_block_state input_pos, output_pos;
if (key->cache == NULL) {
key->cache = malloc(sizeof(struct camellia_key_info_cache));
if (key->cache == NULL)
return ENOMEM;
CACHE(key)->enc_ctx.keybitlen = CACHE(key)->dec_ctx.keybitlen = 0;
}
if (CACHE(key)->dec_ctx.keybitlen == 0) {
if (camellia_dec_key(key->keyblock.contents, key->keyblock.length,
&CACHE(key)->dec_ctx) != camellia_good)
abort();
}
if (ivec != NULL)
memcpy(tmp, ivec->data, BLOCK_SIZE);
else
memset(tmp, 0, BLOCK_SIZE);
for (i = 0, input_length = 0; i < num_data; i++) {
krb5_crypto_iov *iov = &data[i];
if (ENCRYPT_IOV(iov))
input_length += iov->data.length;
}
IOV_BLOCK_STATE_INIT(&input_pos);
IOV_BLOCK_STATE_INIT(&output_pos);
nblocks = (input_length + BLOCK_SIZE - 1) / BLOCK_SIZE;
if (nblocks == 1) {
krb5int_c_iov_get_block(tmp, BLOCK_SIZE, data, num_data, &input_pos);
dec(tmp2, tmp, &CACHE(key)->dec_ctx);
krb5int_c_iov_put_block(data, num_data, tmp2, BLOCK_SIZE, &output_pos);
} else if (nblocks > 1) {
unsigned char blockN2[BLOCK_SIZE]; /* second last */
unsigned char blockN1[BLOCK_SIZE]; /* last block */
for (blockno = 0; blockno < nblocks - 2; blockno++) {
unsigned char blockN[BLOCK_SIZE], *block;
krb5int_c_iov_get_block_nocopy(blockN, BLOCK_SIZE,
data, num_data, &input_pos, &block);
memcpy(tmp2, block, BLOCK_SIZE);
dec(block, block, &CACHE(key)->dec_ctx);
xorblock(block, tmp);
memcpy(tmp, tmp2, BLOCK_SIZE);
krb5int_c_iov_put_block_nocopy(data, num_data, blockN, BLOCK_SIZE,
&output_pos, block);
}
/* Do last two blocks, the second of which (next-to-last block
of plaintext) may be incomplete. */
/* First, get the last two encrypted blocks */
memset(blockN1, 0, sizeof(blockN1)); /* pad last block with zeros */
krb5int_c_iov_get_block(blockN2, BLOCK_SIZE, data, num_data,
&input_pos);
krb5int_c_iov_get_block(blockN1, BLOCK_SIZE, data, num_data,
&input_pos);
if (ivec != NULL)
memcpy(ivec->data, blockN2, BLOCK_SIZE);
/* Decrypt second last block */
dec(tmp2, blockN2, &CACHE(key)->dec_ctx);
/* Set tmp2 to last (possibly partial) plaintext block, and
save it. */
xorblock(tmp2, blockN1);
memcpy(blockN2, tmp2, BLOCK_SIZE);
/* Maybe keep the trailing part, and copy in the last
ciphertext block. */
input_length %= BLOCK_SIZE;
memcpy(tmp2, blockN1, input_length ? input_length : BLOCK_SIZE);
dec(tmp3, tmp2, &CACHE(key)->dec_ctx);
xorblock(tmp3, tmp);
memcpy(blockN1, tmp3, BLOCK_SIZE);
/* Put the last two blocks back into the iovec */
krb5int_c_iov_put_block(data, num_data, blockN1, BLOCK_SIZE,
&output_pos);
krb5int_c_iov_put_block(data, num_data, blockN2, BLOCK_SIZE,
&output_pos);
}
return 0;
}
