crypto: powerpc/ghash - Use API partial block handling

Use the Crypto API partial block handling.

Signed-off-by: Herbert Xu <[e-mail]>

arch/powerpc/crypto/ghash.c

···
  */
 
 #include "aesp8-ppc.h"
-#include <asm/simd.h>
 #include <asm/switch_to.h>
 #include <crypto/aes.h>
-#include <crypto/b128ops.h>
+#include <crypto/gf128mul.h>
 #include <crypto/ghash.h>
 #include <crypto/internal/hash.h>
 #include <crypto/internal/simd.h>
-#include <crypto/scatterwalk.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/string.h>
 #include <linux/uaccess.h>
 
 void gcm_init_p8(u128 htable[16], const u64 Xi[2]);
···
 
 struct p8_ghash_desc_ctx {
 	u64 shash[2];
-	u8 buffer[GHASH_DIGEST_SIZE];
-	int bytes;
 };
 
 static int p8_ghash_init(struct shash_desc *desc)
 {
 	struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
 
-	dctx->bytes = 0;
 	memset(dctx->shash, 0, GHASH_DIGEST_SIZE);
 	return 0;
 }
···
 }
 
 static inline void __ghash_block(struct p8_ghash_ctx *ctx,
-				 struct p8_ghash_desc_ctx *dctx)
+				 struct p8_ghash_desc_ctx *dctx,
+				 const u8 *src)
 {
 	if (crypto_simd_usable()) {
 		preempt_disable();
 		pagefault_disable();
 		enable_kernel_vsx();
-		gcm_ghash_p8(dctx->shash, ctx->htable,
-				dctx->buffer, GHASH_DIGEST_SIZE);
+		gcm_ghash_p8(dctx->shash, ctx->htable, src, GHASH_BLOCK_SIZE);
 		disable_kernel_vsx();
 		pagefault_enable();
 		preempt_enable();
 	} else {
-		crypto_xor((u8 *)dctx->shash, dctx->buffer, GHASH_BLOCK_SIZE);
+		crypto_xor((u8 *)dctx->shash, src, GHASH_BLOCK_SIZE);
 		gf128mul_lle((be128 *)dctx->shash, &ctx->key);
 	}
 }
 
-static inline void __ghash_blocks(struct p8_ghash_ctx *ctx,
-				  struct p8_ghash_desc_ctx *dctx,
-				  const u8 *src, unsigned int srclen)
+static inline int __ghash_blocks(struct p8_ghash_ctx *ctx,
+				 struct p8_ghash_desc_ctx *dctx,
+				 const u8 *src, unsigned int srclen)
 {
+	int remain = srclen - round_down(srclen, GHASH_BLOCK_SIZE);
+
+	srclen -= remain;
 	if (crypto_simd_usable()) {
 		preempt_disable();
 		pagefault_disable();
···
 		pagefault_enable();
 		preempt_enable();
 	} else {
-		while (srclen >= GHASH_BLOCK_SIZE) {
+		do {
 			crypto_xor((u8 *)dctx->shash, src, GHASH_BLOCK_SIZE);
 			gf128mul_lle((be128 *)dctx->shash, &ctx->key);
 			srclen -= GHASH_BLOCK_SIZE;
 			src += GHASH_BLOCK_SIZE;
-		}
+		} while (srclen);
 	}
+
+	return remain;
 }
 
 static int p8_ghash_update(struct shash_desc *desc,
 			   const u8 *src, unsigned int srclen)
 {
-	unsigned int len;
 	struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(desc->tfm));
 	struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
 
-	if (dctx->bytes) {
-		if (dctx->bytes + srclen < GHASH_DIGEST_SIZE) {
-			memcpy(dctx->buffer + dctx->bytes, src,
-				srclen);
-			dctx->bytes += srclen;
-			return 0;
-		}
-		memcpy(dctx->buffer + dctx->bytes, src,
-			GHASH_DIGEST_SIZE - dctx->bytes);
-
-		__ghash_block(ctx, dctx);
-
-		src += GHASH_DIGEST_SIZE - dctx->bytes;
-		srclen -= GHASH_DIGEST_SIZE - dctx->bytes;
-		dctx->bytes = 0;
-	}
-	len = srclen & ~(GHASH_DIGEST_SIZE - 1);
-	if (len) {
-		__ghash_blocks(ctx, dctx, src, len);
-		src += len;
-		srclen -= len;
-	}
-	if (srclen) {
-		memcpy(dctx->buffer, src, srclen);
-		dctx->bytes = srclen;
-	}
-	return 0;
+	return __ghash_blocks(ctx, dctx, src, srclen);
 }
 
-static int p8_ghash_final(struct shash_desc *desc, u8 *out)
+static int p8_ghash_finup(struct shash_desc *desc, const u8 *src,
+			  unsigned int len, u8 *out)
 {
-	int i;
 	struct p8_ghash_ctx *ctx = crypto_tfm_ctx(crypto_shash_tfm(desc->tfm));
 	struct p8_ghash_desc_ctx *dctx = shash_desc_ctx(desc);
 
-	if (dctx->bytes) {
-		for (i = dctx->bytes; i < GHASH_DIGEST_SIZE; i++)
-			dctx->buffer[i] = 0;
-		__ghash_block(ctx, dctx);
-		dctx->bytes = 0;
+	if (len) {
+		u8 buf[GHASH_BLOCK_SIZE] = {};
+
+		memcpy(buf, src, len);
+		__ghash_block(ctx, dctx, buf);
+		memzero_explicit(buf, sizeof(buf));
 	}
 	memcpy(out, dctx->shash, GHASH_DIGEST_SIZE);
 	return 0;
···
 	.digestsize = GHASH_DIGEST_SIZE,
 	.init = p8_ghash_init,
 	.update = p8_ghash_update,
-	.final = p8_ghash_final,
+	.finup = p8_ghash_finup,
 	.setkey = p8_ghash_setkey,
-	.descsize = sizeof(struct p8_ghash_desc_ctx)
-		+ sizeof(struct ghash_desc_ctx),
+	.descsize = sizeof(struct p8_ghash_desc_ctx),
 	.base = {
 		 .cra_name = "ghash",
 		 .cra_driver_name = "p8_ghash",
 		 .cra_priority = 1000,
+		 .cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY,
 		 .cra_blocksize = GHASH_BLOCK_SIZE,
 		 .cra_ctxsize = sizeof(struct p8_ghash_ctx),
 		 .cra_module = THIS_MODULE,