mirror of https://gitee.com/openkylin/linux.git
[CRYPTO] geode: Add fallback for unsupported modes
The Geode AES crypto engine supports only 128 bit long key. This patch adds fallback for other key sizes which are required by the AES standard. Signed-off-by: Sebastian Siewior <sebastian@breakpoint.cc> Acked-by: Jordan Crouse <jordan.crouse@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Sebastian Siewior
Herbert Xu
parent
5157dea813
commit
cd7c3bfe54
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@ -113,18 +113,103 @@ geode_aes_crypt(struct geode_aes_op *op)
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/* CRYPTO-API Functions */
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static int
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geode_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int len)
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static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key,
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unsigned int len)
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{
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struct geode_aes_op *op = crypto_tfm_ctx(tfm);
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unsigned int ret;
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if (len != AES_KEY_LENGTH) {
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op->keylen = len;
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if (len == AES_KEYSIZE_128) {
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memcpy(op->key, key, len);
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return 0;
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}
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if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
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/* not supported at all */
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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memcpy(op->key, key, len);
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return 0;
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/*
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* The requested key size is not supported by HW, do a fallback
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*/
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op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
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op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
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ret = crypto_cipher_setkey(op->fallback.cip, key, len);
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if (ret) {
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tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
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tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
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}
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return ret;
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}
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static int geode_setkey_blk(struct crypto_tfm *tfm, const u8 *key,
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unsigned int len)
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{
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struct geode_aes_op *op = crypto_tfm_ctx(tfm);
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unsigned int ret;
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op->keylen = len;
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if (len == AES_KEYSIZE_128) {
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memcpy(op->key, key, len);
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return 0;
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}
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if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) {
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/* not supported at all */
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tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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/*
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* The requested key size is not supported by HW, do a fallback
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*/
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op->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
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op->fallback.blk->base.crt_flags |= (tfm->crt_flags & CRYPTO_TFM_REQ_MASK);
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ret = crypto_blkcipher_setkey(op->fallback.blk, key, len);
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if (ret) {
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tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
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tfm->crt_flags |= (op->fallback.blk->base.crt_flags & CRYPTO_TFM_RES_MASK);
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}
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return ret;
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}
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static int fallback_blk_dec(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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unsigned int ret;
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struct crypto_blkcipher *tfm;
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struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
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tfm = desc->tfm;
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desc->tfm = op->fallback.blk;
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ret = crypto_blkcipher_decrypt(desc, dst, src, nbytes);
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desc->tfm = tfm;
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return ret;
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}
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static int fallback_blk_enc(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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unsigned int ret;
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struct crypto_blkcipher *tfm;
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struct geode_aes_op *op = crypto_blkcipher_ctx(desc->tfm);
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tfm = desc->tfm;
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desc->tfm = op->fallback.blk;
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ret = crypto_blkcipher_encrypt(desc, dst, src, nbytes);
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desc->tfm = tfm;
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return ret;
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}
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static void
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@ -132,8 +217,10 @@ geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct geode_aes_op *op = crypto_tfm_ctx(tfm);
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if ((out == NULL) || (in == NULL))
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if (unlikely(op->keylen != AES_KEYSIZE_128)) {
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crypto_cipher_encrypt_one(op->fallback.cip, out, in);
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return;
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}
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op->src = (void *) in;
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op->dst = (void *) out;
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@ -151,8 +238,10 @@ geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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struct geode_aes_op *op = crypto_tfm_ctx(tfm);
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if ((out == NULL) || (in == NULL))
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if (unlikely(op->keylen != AES_KEYSIZE_128)) {
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crypto_cipher_decrypt_one(op->fallback.cip, out, in);
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return;
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}
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op->src = (void *) in;
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op->dst = (void *) out;
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@ -164,24 +253,50 @@ geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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geode_aes_crypt(op);
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}
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static int fallback_init_cip(struct crypto_tfm *tfm)
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{
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const char *name = tfm->__crt_alg->cra_name;
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struct geode_aes_op *op = crypto_tfm_ctx(tfm);
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op->fallback.cip = crypto_alloc_cipher(name, 0,
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CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(op->fallback.cip)) {
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printk(KERN_ERR "Error allocating fallback algo %s\n", name);
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return PTR_ERR(op->fallback.blk);
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}
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return 0;
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}
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static void fallback_exit_cip(struct crypto_tfm *tfm)
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{
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struct geode_aes_op *op = crypto_tfm_ctx(tfm);
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crypto_free_cipher(op->fallback.cip);
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op->fallback.cip = NULL;
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}
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static struct crypto_alg geode_alg = {
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.cra_name = "aes",
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.cra_driver_name = "geode-aes-128",
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.cra_priority = 300,
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.cra_alignmask = 15,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_name = "aes",
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.cra_driver_name = "geode-aes",
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.cra_priority = 300,
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.cra_alignmask = 15,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_init = fallback_init_cip,
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.cra_exit = fallback_exit_cip,
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.cra_blocksize = AES_MIN_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct geode_aes_op),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
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.cra_u = {
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.cipher = {
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.cia_min_keysize = AES_KEY_LENGTH,
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.cia_max_keysize = AES_KEY_LENGTH,
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.cia_setkey = geode_setkey,
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.cia_encrypt = geode_encrypt,
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.cia_decrypt = geode_decrypt
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(geode_alg.cra_list),
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.cra_u = {
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.cipher = {
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.cia_min_keysize = AES_MIN_KEY_SIZE,
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.cia_max_keysize = AES_MAX_KEY_SIZE,
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.cia_setkey = geode_setkey_cip,
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.cia_encrypt = geode_encrypt,
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.cia_decrypt = geode_decrypt
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}
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}
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};
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@ -195,6 +310,9 @@ geode_cbc_decrypt(struct blkcipher_desc *desc,
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struct blkcipher_walk walk;
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int err, ret;
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if (unlikely(op->keylen != AES_KEYSIZE_128))
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return fallback_blk_dec(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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memcpy(op->iv, walk.iv, AES_IV_LENGTH);
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@ -225,6 +343,9 @@ geode_cbc_encrypt(struct blkcipher_desc *desc,
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struct blkcipher_walk walk;
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int err, ret;
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if (unlikely(op->keylen != AES_KEYSIZE_128))
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return fallback_blk_enc(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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memcpy(op->iv, walk.iv, AES_IV_LENGTH);
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@ -245,22 +366,49 @@ geode_cbc_encrypt(struct blkcipher_desc *desc,
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return err;
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}
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static int fallback_init_blk(struct crypto_tfm *tfm)
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{
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const char *name = tfm->__crt_alg->cra_name;
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struct geode_aes_op *op = crypto_tfm_ctx(tfm);
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op->fallback.blk = crypto_alloc_blkcipher(name, 0,
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CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(op->fallback.blk)) {
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printk(KERN_ERR "Error allocating fallback algo %s\n", name);
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return PTR_ERR(op->fallback.blk);
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}
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return 0;
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}
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static void fallback_exit_blk(struct crypto_tfm *tfm)
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{
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struct geode_aes_op *op = crypto_tfm_ctx(tfm);
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crypto_free_blkcipher(op->fallback.blk);
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op->fallback.blk = NULL;
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}
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static struct crypto_alg geode_cbc_alg = {
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.cra_name = "cbc(aes)",
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.cra_driver_name = "cbc-aes-geode-128",
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.cra_driver_name = "cbc-aes-geode",
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.cra_priority = 400,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_init = fallback_init_blk,
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.cra_exit = fallback_exit_blk,
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.cra_blocksize = AES_MIN_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct geode_aes_op),
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.cra_alignmask = 15,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = AES_KEY_LENGTH,
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.max_keysize = AES_KEY_LENGTH,
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.setkey = geode_setkey,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(geode_cbc_alg.cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.setkey = geode_setkey_blk,
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.encrypt = geode_cbc_encrypt,
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.decrypt = geode_cbc_decrypt,
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.ivsize = AES_IV_LENGTH,
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@ -277,6 +425,9 @@ geode_ecb_decrypt(struct blkcipher_desc *desc,
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struct blkcipher_walk walk;
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int err, ret;
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if (unlikely(op->keylen != AES_KEYSIZE_128))
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return fallback_blk_dec(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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@ -304,6 +455,9 @@ geode_ecb_encrypt(struct blkcipher_desc *desc,
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struct blkcipher_walk walk;
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int err, ret;
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if (unlikely(op->keylen != AES_KEYSIZE_128))
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return fallback_blk_enc(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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err = blkcipher_walk_virt(desc, &walk);
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@ -323,21 +477,24 @@ geode_ecb_encrypt(struct blkcipher_desc *desc,
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}
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static struct crypto_alg geode_ecb_alg = {
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.cra_name = "ecb(aes)",
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.cra_driver_name = "ecb-aes-geode-128",
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.cra_name = "ecb(aes)",
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.cra_driver_name = "ecb-aes-geode",
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.cra_priority = 400,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_init = fallback_init_blk,
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.cra_exit = fallback_exit_blk,
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.cra_blocksize = AES_MIN_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct geode_aes_op),
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.cra_alignmask = 15,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = AES_KEY_LENGTH,
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.max_keysize = AES_KEY_LENGTH,
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.setkey = geode_setkey,
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(geode_ecb_alg.cra_list),
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.cra_u = {
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.blkcipher = {
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.setkey = geode_setkey_blk,
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.encrypt = geode_ecb_encrypt,
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.decrypt = geode_ecb_decrypt,
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}
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@ -367,7 +524,7 @@ geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id)
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if ((ret = pci_enable_device(dev)))
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return ret;
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if ((ret = pci_request_regions(dev, "geode-aes-128")))
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if ((ret = pci_request_regions(dev, "geode-aes")))
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goto eenable;
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_iobase = pci_iomap(dev, 0, 0);
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@ -66,6 +66,12 @@ struct geode_aes_op {
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u8 key[AES_KEY_LENGTH];
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u8 iv[AES_IV_LENGTH];
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union {
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struct crypto_blkcipher *blk;
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struct crypto_cipher *cip;
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} fallback;
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u32 keylen;
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};
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#endif
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