- struct crypto_hash *parent = pdesc->tfm;
- struct crypto_xcbc_ctx *ctx = crypto_hash_ctx_aligned(parent);
- struct crypto_cipher *tfm = ctx->child;
- int bs = crypto_hash_blocksize(parent);
- unsigned int i = 0;
-
- do {
-
- struct page *pg = sg_page(&sg[i]);
- unsigned int offset = sg[i].offset;
- unsigned int slen = sg[i].length;
-
- while (slen > 0) {
- unsigned int len = min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
- char *p = crypto_kmap(pg, 0) + offset;
-
- /* checking the data can fill the block */
- if ((ctx->len + len) <= bs) {
- memcpy(ctx->odds + ctx->len, p, len);
- ctx->len += len;
- slen -= len;
-
- /* checking the rest of the page */
- if (len + offset >= PAGE_SIZE) {
- offset = 0;
- pg++;
- } else
- offset += len;
-
- crypto_kunmap(p, 0);
- crypto_yield(pdesc->flags);
- continue;
- }
-
- /* filling odds with new data and encrypting it */
- memcpy(ctx->odds + ctx->len, p, bs - ctx->len);
- len -= bs - ctx->len;
- p += bs - ctx->len;
-
- ctx->xor(ctx->prev, ctx->odds, bs);
- crypto_cipher_encrypt_one(tfm, ctx->prev, ctx->prev);
-
- /* clearing the length */
- ctx->len = 0;
-
- /* encrypting the rest of data */
- while (len > bs) {
- ctx->xor(ctx->prev, p, bs);
- crypto_cipher_encrypt_one(tfm, ctx->prev,
- ctx->prev);
- p += bs;
- len -= bs;
- }
-
- /* keeping the surplus of blocksize */
- if (len) {
- memcpy(ctx->odds, p, len);
- ctx->len = len;
- }
- crypto_kunmap(p, 0);
- crypto_yield(pdesc->flags);
- slen -= min(slen, ((unsigned int)(PAGE_SIZE)) - offset);
- offset = 0;
- pg++;
- }
- nbytes-=sg[i].length;
- i++;
- } while (nbytes>0);
+ struct crypto_shash *parent = pdesc->tfm;
+ unsigned long alignmask = crypto_shash_alignmask(parent);
+ struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent);
+ struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc);
+ struct crypto_cipher *tfm = tctx->child;
+ int bs = crypto_shash_blocksize(parent);
+ u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1);
+ u8 *prev = odds + bs;
+
+ /* checking the data can fill the block */
+ if ((ctx->len + len) <= bs) {
+ memcpy(odds + ctx->len, p, len);
+ ctx->len += len;
+ return 0;
+ }