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[BLOCK] dm-crypt: Use block ciphers where applicable
This patch converts dm-crypt to use the new block cipher type where applicable. It also changes simple cipher operations to use the new encrypt_one/decrypt_one interface. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
parent
69affe7fc5
commit
d1806f6a97
@ -5,6 +5,7 @@
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* This file is released under the GPL.
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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@ -78,11 +79,13 @@ struct crypt_config {
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*/
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struct crypt_iv_operations *iv_gen_ops;
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char *iv_mode;
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void *iv_gen_private;
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struct crypto_cipher *iv_gen_private;
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sector_t iv_offset;
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unsigned int iv_size;
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struct crypto_tfm *tfm;
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char cipher[CRYPTO_MAX_ALG_NAME];
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char chainmode[CRYPTO_MAX_ALG_NAME];
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struct crypto_blkcipher *tfm;
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unsigned int key_size;
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u8 key[0];
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};
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@ -118,11 +121,12 @@ static int crypt_iv_plain_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
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static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
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const char *opts)
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{
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struct crypto_tfm *essiv_tfm;
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struct crypto_cipher *essiv_tfm;
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struct crypto_tfm *hash_tfm;
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struct scatterlist sg;
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unsigned int saltsize;
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u8 *salt;
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int err;
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if (opts == NULL) {
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ti->error = "Digest algorithm missing for ESSIV mode";
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@ -155,51 +159,44 @@ static int crypt_iv_essiv_ctr(struct crypt_config *cc, struct dm_target *ti,
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crypto_free_tfm(hash_tfm);
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/* Setup the essiv_tfm with the given salt */
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essiv_tfm = crypto_alloc_tfm(crypto_tfm_alg_name(cc->tfm),
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CRYPTO_TFM_MODE_ECB |
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CRYPTO_TFM_REQ_MAY_SLEEP);
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if (essiv_tfm == NULL) {
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essiv_tfm = crypto_alloc_cipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(essiv_tfm)) {
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ti->error = "Error allocating crypto tfm for ESSIV";
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kfree(salt);
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return -EINVAL;
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return PTR_ERR(essiv_tfm);
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}
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if (crypto_tfm_alg_blocksize(essiv_tfm)
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!= crypto_tfm_alg_ivsize(cc->tfm)) {
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if (crypto_cipher_blocksize(essiv_tfm) !=
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crypto_blkcipher_ivsize(cc->tfm)) {
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ti->error = "Block size of ESSIV cipher does "
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"not match IV size of block cipher";
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crypto_free_tfm(essiv_tfm);
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crypto_free_cipher(essiv_tfm);
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kfree(salt);
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return -EINVAL;
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}
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if (crypto_cipher_setkey(essiv_tfm, salt, saltsize) < 0) {
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err = crypto_cipher_setkey(essiv_tfm, salt, saltsize);
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if (err) {
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ti->error = "Failed to set key for ESSIV cipher";
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crypto_free_tfm(essiv_tfm);
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crypto_free_cipher(essiv_tfm);
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kfree(salt);
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return -EINVAL;
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return err;
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}
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kfree(salt);
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cc->iv_gen_private = (void *)essiv_tfm;
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cc->iv_gen_private = essiv_tfm;
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return 0;
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}
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static void crypt_iv_essiv_dtr(struct crypt_config *cc)
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{
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crypto_free_tfm((struct crypto_tfm *)cc->iv_gen_private);
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crypto_free_cipher(cc->iv_gen_private);
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cc->iv_gen_private = NULL;
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}
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static int crypt_iv_essiv_gen(struct crypt_config *cc, u8 *iv, sector_t sector)
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{
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struct scatterlist sg;
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memset(iv, 0, cc->iv_size);
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*(u64 *)iv = cpu_to_le64(sector);
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sg_set_buf(&sg, iv, cc->iv_size);
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crypto_cipher_encrypt((struct crypto_tfm *)cc->iv_gen_private,
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&sg, &sg, cc->iv_size);
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crypto_cipher_encrypt_one(cc->iv_gen_private, iv, iv);
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return 0;
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}
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@ -220,6 +217,11 @@ crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
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int write, sector_t sector)
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{
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u8 iv[cc->iv_size];
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struct blkcipher_desc desc = {
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.tfm = cc->tfm,
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.info = iv,
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.flags = CRYPTO_TFM_REQ_MAY_SLEEP,
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};
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int r;
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if (cc->iv_gen_ops) {
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@ -228,14 +230,14 @@ crypt_convert_scatterlist(struct crypt_config *cc, struct scatterlist *out,
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return r;
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if (write)
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r = crypto_cipher_encrypt_iv(cc->tfm, out, in, length, iv);
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r = crypto_blkcipher_encrypt_iv(&desc, out, in, length);
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else
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r = crypto_cipher_decrypt_iv(cc->tfm, out, in, length, iv);
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r = crypto_blkcipher_decrypt_iv(&desc, out, in, length);
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} else {
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if (write)
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r = crypto_cipher_encrypt(cc->tfm, out, in, length);
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r = crypto_blkcipher_encrypt(&desc, out, in, length);
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else
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r = crypto_cipher_decrypt(cc->tfm, out, in, length);
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r = crypto_blkcipher_decrypt(&desc, out, in, length);
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}
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return r;
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@ -510,13 +512,12 @@ static void crypt_encode_key(char *hex, u8 *key, unsigned int size)
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static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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{
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struct crypt_config *cc;
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struct crypto_tfm *tfm;
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struct crypto_blkcipher *tfm;
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char *tmp;
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char *cipher;
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char *chainmode;
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char *ivmode;
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char *ivopts;
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unsigned int crypto_flags;
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unsigned int key_size;
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unsigned long long tmpll;
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@ -556,31 +557,25 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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ivmode = "plain";
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}
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/* Choose crypto_flags according to chainmode */
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if (strcmp(chainmode, "cbc") == 0)
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crypto_flags = CRYPTO_TFM_MODE_CBC;
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else if (strcmp(chainmode, "ecb") == 0)
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crypto_flags = CRYPTO_TFM_MODE_ECB;
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else {
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ti->error = "Unknown chaining mode";
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goto bad1;
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}
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if (crypto_flags != CRYPTO_TFM_MODE_ECB && !ivmode) {
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if (strcmp(chainmode, "ecb") && !ivmode) {
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ti->error = "This chaining mode requires an IV mechanism";
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goto bad1;
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}
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tfm = crypto_alloc_tfm(cipher, crypto_flags | CRYPTO_TFM_REQ_MAY_SLEEP);
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if (!tfm) {
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if (snprintf(cc->cipher, CRYPTO_MAX_ALG_NAME, "%s(%s)", chainmode,
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cipher) >= CRYPTO_MAX_ALG_NAME) {
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ti->error = "Chain mode + cipher name is too long";
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goto bad1;
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}
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tfm = crypto_alloc_blkcipher(cc->cipher, 0, CRYPTO_ALG_ASYNC);
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if (IS_ERR(tfm)) {
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ti->error = "Error allocating crypto tfm";
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goto bad1;
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}
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if (crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER) {
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ti->error = "Expected cipher algorithm";
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goto bad2;
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}
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strcpy(cc->cipher, cipher);
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strcpy(cc->chainmode, chainmode);
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cc->tfm = tfm;
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/*
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@ -603,12 +598,12 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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cc->iv_gen_ops->ctr(cc, ti, ivopts) < 0)
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goto bad2;
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if (tfm->crt_cipher.cit_decrypt_iv && tfm->crt_cipher.cit_encrypt_iv)
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cc->iv_size = crypto_blkcipher_ivsize(tfm);
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if (cc->iv_size)
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/* at least a 64 bit sector number should fit in our buffer */
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cc->iv_size = max(crypto_tfm_alg_ivsize(tfm),
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cc->iv_size = max(cc->iv_size,
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(unsigned int)(sizeof(u64) / sizeof(u8)));
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else {
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cc->iv_size = 0;
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if (cc->iv_gen_ops) {
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DMWARN("Selected cipher does not support IVs");
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if (cc->iv_gen_ops->dtr)
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@ -629,7 +624,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
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goto bad4;
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}
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if (tfm->crt_cipher.cit_setkey(tfm, cc->key, key_size) < 0) {
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if (crypto_blkcipher_setkey(tfm, cc->key, key_size) < 0) {
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ti->error = "Error setting key";
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goto bad5;
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}
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@ -675,7 +670,7 @@ bad3:
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if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
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cc->iv_gen_ops->dtr(cc);
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bad2:
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crypto_free_tfm(tfm);
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crypto_free_blkcipher(tfm);
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bad1:
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/* Must zero key material before freeing */
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memset(cc, 0, sizeof(*cc) + cc->key_size * sizeof(u8));
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@ -693,7 +688,7 @@ static void crypt_dtr(struct dm_target *ti)
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kfree(cc->iv_mode);
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if (cc->iv_gen_ops && cc->iv_gen_ops->dtr)
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cc->iv_gen_ops->dtr(cc);
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crypto_free_tfm(cc->tfm);
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crypto_free_blkcipher(cc->tfm);
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dm_put_device(ti, cc->dev);
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/* Must zero key material before freeing */
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@ -858,18 +853,9 @@ static int crypt_status(struct dm_target *ti, status_type_t type,
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break;
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case STATUSTYPE_TABLE:
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cipher = crypto_tfm_alg_name(cc->tfm);
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cipher = crypto_blkcipher_name(cc->tfm);
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switch(cc->tfm->crt_cipher.cit_mode) {
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case CRYPTO_TFM_MODE_CBC:
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chainmode = "cbc";
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break;
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case CRYPTO_TFM_MODE_ECB:
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chainmode = "ecb";
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break;
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default:
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BUG();
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}
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chainmode = cc->chainmode;
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if (cc->iv_mode)
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DMEMIT("%s-%s-%s ", cipher, chainmode, cc->iv_mode);
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