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-rw-r--r--crypto/cipher.c447
1 files changed, 3 insertions, 444 deletions
diff --git a/crypto/cipher.c b/crypto/cipher.c
index 9e03701cfdc..333aab2f027 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -12,274 +12,13 @@
* any later version.
*
*/
-#include <linux/compiler.h>
+
#include <linux/kernel.h>
#include <linux/crypto.h>
#include <linux/errno.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
+#include <linux/scatterlist.h>
#include <linux/string.h>
-#include <asm/scatterlist.h>
#include "internal.h"
-#include "scatterwalk.h"
-
-struct cipher_alg_compat {
- unsigned int cia_min_keysize;
- unsigned int cia_max_keysize;
- int (*cia_setkey)(struct crypto_tfm *tfm, const u8 *key,
- unsigned int keylen);
- void (*cia_encrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
- void (*cia_decrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
-
- unsigned int (*cia_encrypt_ecb)(const struct cipher_desc *desc,
- u8 *dst, const u8 *src,
- unsigned int nbytes);
- unsigned int (*cia_decrypt_ecb)(const struct cipher_desc *desc,
- u8 *dst, const u8 *src,
- unsigned int nbytes);
- unsigned int (*cia_encrypt_cbc)(const struct cipher_desc *desc,
- u8 *dst, const u8 *src,
- unsigned int nbytes);
- unsigned int (*cia_decrypt_cbc)(const struct cipher_desc *desc,
- u8 *dst, const u8 *src,
- unsigned int nbytes);
-};
-
-static inline void xor_64(u8 *a, const u8 *b)
-{
- ((u32 *)a)[0] ^= ((u32 *)b)[0];
- ((u32 *)a)[1] ^= ((u32 *)b)[1];
-}
-
-static inline void xor_128(u8 *a, const u8 *b)
-{
- ((u32 *)a)[0] ^= ((u32 *)b)[0];
- ((u32 *)a)[1] ^= ((u32 *)b)[1];
- ((u32 *)a)[2] ^= ((u32 *)b)[2];
- ((u32 *)a)[3] ^= ((u32 *)b)[3];
-}
-
-static unsigned int crypt_slow(const struct cipher_desc *desc,
- struct scatter_walk *in,
- struct scatter_walk *out, unsigned int bsize)
-{
- unsigned long alignmask = crypto_tfm_alg_alignmask(desc->tfm);
- u8 buffer[bsize * 2 + alignmask];
- u8 *src = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
- u8 *dst = src + bsize;
-
- scatterwalk_copychunks(src, in, bsize, 0);
- desc->prfn(desc, dst, src, bsize);
- scatterwalk_copychunks(dst, out, bsize, 1);
-
- return bsize;
-}
-
-static inline unsigned int crypt_fast(const struct cipher_desc *desc,
- struct scatter_walk *in,
- struct scatter_walk *out,
- unsigned int nbytes, u8 *tmp)
-{
- u8 *src, *dst;
- u8 *real_src, *real_dst;
-
- real_src = scatterwalk_map(in, 0);
- real_dst = scatterwalk_map(out, 1);
-
- src = real_src;
- dst = scatterwalk_samebuf(in, out) ? src : real_dst;
-
- if (tmp) {
- memcpy(tmp, src, nbytes);
- src = tmp;
- dst = tmp;
- }
-
- nbytes = desc->prfn(desc, dst, src, nbytes);
-
- if (tmp)
- memcpy(real_dst, tmp, nbytes);
-
- scatterwalk_unmap(real_src, 0);
- scatterwalk_unmap(real_dst, 1);
-
- scatterwalk_advance(in, nbytes);
- scatterwalk_advance(out, nbytes);
-
- return nbytes;
-}
-
-/*
- * Generic encrypt/decrypt wrapper for ciphers, handles operations across
- * multiple page boundaries by using temporary blocks. In user context,
- * the kernel is given a chance to schedule us once per page.
- */
-static int crypt(const struct cipher_desc *desc,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- struct scatter_walk walk_in, walk_out;
- struct crypto_tfm *tfm = desc->tfm;
- const unsigned int bsize = crypto_tfm_alg_blocksize(tfm);
- unsigned int alignmask = crypto_tfm_alg_alignmask(tfm);
- unsigned long buffer = 0;
-
- if (!nbytes)
- return 0;
-
- if (nbytes % bsize) {
- tfm->crt_flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
- return -EINVAL;
- }
-
- scatterwalk_start(&walk_in, src);
- scatterwalk_start(&walk_out, dst);
-
- for(;;) {
- unsigned int n = nbytes;
- u8 *tmp = NULL;
-
- if (!scatterwalk_aligned(&walk_in, alignmask) ||
- !scatterwalk_aligned(&walk_out, alignmask)) {
- if (!buffer) {
- buffer = __get_free_page(GFP_ATOMIC);
- if (!buffer)
- n = 0;
- }
- tmp = (u8 *)buffer;
- }
-
- n = scatterwalk_clamp(&walk_in, n);
- n = scatterwalk_clamp(&walk_out, n);
-
- if (likely(n >= bsize))
- n = crypt_fast(desc, &walk_in, &walk_out, n, tmp);
- else
- n = crypt_slow(desc, &walk_in, &walk_out, bsize);
-
- nbytes -= n;
-
- scatterwalk_done(&walk_in, 0, nbytes);
- scatterwalk_done(&walk_out, 1, nbytes);
-
- if (!nbytes)
- break;
-
- crypto_yield(tfm->crt_flags);
- }
-
- if (buffer)
- free_page(buffer);
-
- return 0;
-}
-
-static int crypt_iv_unaligned(struct cipher_desc *desc,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- struct crypto_tfm *tfm = desc->tfm;
- unsigned long alignmask = crypto_tfm_alg_alignmask(tfm);
- u8 *iv = desc->info;
-
- if (unlikely(((unsigned long)iv & alignmask))) {
- unsigned int ivsize = tfm->crt_cipher.cit_ivsize;
- u8 buffer[ivsize + alignmask];
- u8 *tmp = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
- int err;
-
- desc->info = memcpy(tmp, iv, ivsize);
- err = crypt(desc, dst, src, nbytes);
- memcpy(iv, tmp, ivsize);
-
- return err;
- }
-
- return crypt(desc, dst, src, nbytes);
-}
-
-static unsigned int cbc_process_encrypt(const struct cipher_desc *desc,
- u8 *dst, const u8 *src,
- unsigned int nbytes)
-{
- struct crypto_tfm *tfm = desc->tfm;
- void (*xor)(u8 *, const u8 *) = tfm->crt_u.cipher.cit_xor_block;
- int bsize = crypto_tfm_alg_blocksize(tfm);
-
- void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = desc->crfn;
- u8 *iv = desc->info;
- unsigned int done = 0;
-
- nbytes -= bsize;
-
- do {
- xor(iv, src);
- fn(tfm, dst, iv);
- memcpy(iv, dst, bsize);
-
- src += bsize;
- dst += bsize;
- } while ((done += bsize) <= nbytes);
-
- return done;
-}
-
-static unsigned int cbc_process_decrypt(const struct cipher_desc *desc,
- u8 *dst, const u8 *src,
- unsigned int nbytes)
-{
- struct crypto_tfm *tfm = desc->tfm;
- void (*xor)(u8 *, const u8 *) = tfm->crt_u.cipher.cit_xor_block;
- int bsize = crypto_tfm_alg_blocksize(tfm);
- unsigned long alignmask = crypto_tfm_alg_alignmask(desc->tfm);
-
- u8 stack[src == dst ? bsize + alignmask : 0];
- u8 *buf = (u8 *)ALIGN((unsigned long)stack, alignmask + 1);
- u8 **dst_p = src == dst ? &buf : &dst;
-
- void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = desc->crfn;
- u8 *iv = desc->info;
- unsigned int done = 0;
-
- nbytes -= bsize;
-
- do {
- u8 *tmp_dst = *dst_p;
-
- fn(tfm, tmp_dst, src);
- xor(tmp_dst, iv);
- memcpy(iv, src, bsize);
- if (tmp_dst != dst)
- memcpy(dst, tmp_dst, bsize);
-
- src += bsize;
- dst += bsize;
- } while ((done += bsize) <= nbytes);
-
- return done;
-}
-
-static unsigned int ecb_process(const struct cipher_desc *desc, u8 *dst,
- const u8 *src, unsigned int nbytes)
-{
- struct crypto_tfm *tfm = desc->tfm;
- int bsize = crypto_tfm_alg_blocksize(tfm);
- void (*fn)(struct crypto_tfm *, u8 *, const u8 *) = desc->crfn;
- unsigned int done = 0;
-
- nbytes -= bsize;
-
- do {
- fn(tfm, dst, src);
-
- src += bsize;
- dst += bsize;
- } while ((done += bsize) <= nbytes);
-
- return done;
-}
static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
@@ -293,122 +32,6 @@ static int setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
return cia->cia_setkey(tfm, key, keylen);
}
-static int ecb_encrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src, unsigned int nbytes)
-{
- struct cipher_desc desc;
- struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
-
- desc.tfm = tfm;
- desc.crfn = cipher->cia_encrypt;
- desc.prfn = cipher->cia_encrypt_ecb ?: ecb_process;
-
- return crypt(&desc, dst, src, nbytes);
-}
-
-static int ecb_decrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- struct cipher_desc desc;
- struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
-
- desc.tfm = tfm;
- desc.crfn = cipher->cia_decrypt;
- desc.prfn = cipher->cia_decrypt_ecb ?: ecb_process;
-
- return crypt(&desc, dst, src, nbytes);
-}
-
-static int cbc_encrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- struct cipher_desc desc;
- struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
-
- desc.tfm = tfm;
- desc.crfn = cipher->cia_encrypt;
- desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt;
- desc.info = tfm->crt_cipher.cit_iv;
-
- return crypt(&desc, dst, src, nbytes);
-}
-
-static int cbc_encrypt_iv(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes, u8 *iv)
-{
- struct cipher_desc desc;
- struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
-
- desc.tfm = tfm;
- desc.crfn = cipher->cia_encrypt;
- desc.prfn = cipher->cia_encrypt_cbc ?: cbc_process_encrypt;
- desc.info = iv;
-
- return crypt_iv_unaligned(&desc, dst, src, nbytes);
-}
-
-static int cbc_decrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- struct cipher_desc desc;
- struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
-
- desc.tfm = tfm;
- desc.crfn = cipher->cia_decrypt;
- desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt;
- desc.info = tfm->crt_cipher.cit_iv;
-
- return crypt(&desc, dst, src, nbytes);
-}
-
-static int cbc_decrypt_iv(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes, u8 *iv)
-{
- struct cipher_desc desc;
- struct cipher_alg_compat *cipher = (void *)&tfm->__crt_alg->cra_cipher;
-
- desc.tfm = tfm;
- desc.crfn = cipher->cia_decrypt;
- desc.prfn = cipher->cia_decrypt_cbc ?: cbc_process_decrypt;
- desc.info = iv;
-
- return crypt_iv_unaligned(&desc, dst, src, nbytes);
-}
-
-static int nocrypt(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes)
-{
- return -ENOSYS;
-}
-
-static int nocrypt_iv(struct crypto_tfm *tfm,
- struct scatterlist *dst,
- struct scatterlist *src,
- unsigned int nbytes, u8 *iv)
-{
- return -ENOSYS;
-}
-
-int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags)
-{
- u32 mode = flags & CRYPTO_TFM_MODE_MASK;
- tfm->crt_cipher.cit_mode = mode ? mode : CRYPTO_TFM_MODE_ECB;
- return 0;
-}
-
static void cipher_crypt_unaligned(void (*fn)(struct crypto_tfm *, u8 *,
const u8 *),
struct crypto_tfm *tfm,
@@ -454,7 +77,6 @@ static void cipher_decrypt_unaligned(struct crypto_tfm *tfm,
int crypto_init_cipher_ops(struct crypto_tfm *tfm)
{
- int ret = 0;
struct cipher_tfm *ops = &tfm->crt_cipher;
struct cipher_alg *cipher = &tfm->__crt_alg->cra_cipher;
@@ -464,70 +86,7 @@ int crypto_init_cipher_ops(struct crypto_tfm *tfm)
ops->cit_decrypt_one = crypto_tfm_alg_alignmask(tfm) ?
cipher_decrypt_unaligned : cipher->cia_decrypt;
- switch (tfm->crt_cipher.cit_mode) {
- case CRYPTO_TFM_MODE_ECB:
- ops->cit_encrypt = ecb_encrypt;
- ops->cit_decrypt = ecb_decrypt;
- ops->cit_encrypt_iv = nocrypt_iv;
- ops->cit_decrypt_iv = nocrypt_iv;
- break;
-
- case CRYPTO_TFM_MODE_CBC:
- ops->cit_encrypt = cbc_encrypt;
- ops->cit_decrypt = cbc_decrypt;
- ops->cit_encrypt_iv = cbc_encrypt_iv;
- ops->cit_decrypt_iv = cbc_decrypt_iv;
- break;
-
- case CRYPTO_TFM_MODE_CFB:
- ops->cit_encrypt = nocrypt;
- ops->cit_decrypt = nocrypt;
- ops->cit_encrypt_iv = nocrypt_iv;
- ops->cit_decrypt_iv = nocrypt_iv;
- break;
-
- case CRYPTO_TFM_MODE_CTR:
- ops->cit_encrypt = nocrypt;
- ops->cit_decrypt = nocrypt;
- ops->cit_encrypt_iv = nocrypt_iv;
- ops->cit_decrypt_iv = nocrypt_iv;
- break;
-
- default:
- BUG();
- }
-
- if (ops->cit_mode == CRYPTO_TFM_MODE_CBC) {
- unsigned long align;
- unsigned long addr;
-
- switch (crypto_tfm_alg_blocksize(tfm)) {
- case 8:
- ops->cit_xor_block = xor_64;
- break;
-
- case 16:
- ops->cit_xor_block = xor_128;
- break;
-
- default:
- printk(KERN_WARNING "%s: block size %u not supported\n",
- crypto_tfm_alg_name(tfm),
- crypto_tfm_alg_blocksize(tfm));
- ret = -EINVAL;
- goto out;
- }
-
- ops->cit_ivsize = crypto_tfm_alg_blocksize(tfm);
- align = crypto_tfm_alg_alignmask(tfm) + 1;
- addr = (unsigned long)crypto_tfm_ctx(tfm);
- addr = ALIGN(addr, align);
- addr += ALIGN(tfm->__crt_alg->cra_ctxsize, align);
- ops->cit_iv = (void *)addr;
- }
-
-out:
- return ret;
+ return 0;
}
void crypto_exit_cipher_ops(struct crypto_tfm *tfm)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-02 08:01:34 +0000