crypto: arm/sha2-ce - move SHA-224/256 ARMv8 implementation to base layer

This removes all the boilerplate from the existing implementation,
and replaces it with calls into the base layer.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 39 insertions, 137 deletions

diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig
index 5ed98bc6f95d..a267529d9577 100644
--- a/arch/arm/crypto/Kconfig
+++ b/arch/arm/crypto/Kconfig
@@ -39,7 +39,7 @@ config CRYPTO_SHA1_ARM_CE
 config CRYPTO_SHA2_ARM_CE
         tristate "SHA-224/256 digest algorithm (ARM v8 Crypto Extensions)"
         depends on KERNEL_MODE_NEON
-        select CRYPTO_SHA256
+        select CRYPTO_SHA256_ARM
         select CRYPTO_HASH
         help
           SHA-256 secure hash standard (DFIPS 180-2) implemented
diff --git a/arch/arm/crypto/sha2-ce-core.S b/arch/arm/crypto/sha2-ce-core.S
index 96af09fe957b..87ec11a5f405 100644
--- a/arch/arm/crypto/sha2-ce-core.S
+++ b/arch/arm/crypto/sha2-ce-core.S
@@ -69,27 +69,18 @@
         .word           0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
 
         /*
-         * void sha2_ce_transform(int blocks, u8 const *src, u32 *state,
-         *                        u8 *head);
+         * void sha2_ce_transform(struct sha256_state *sst, u8 const *src,
+                                  int blocks);
          */
 ENTRY(sha2_ce_transform)
         /* load state */
-        vld1.32         {dga-dgb}, [r2]
-
-        /* load partial input (if supplied) */
-        teq             r3, #0
-        beq             0f
-        vld1.32         {q0-q1}, [r3]!
-        vld1.32         {q2-q3}, [r3]
-        teq             r0, #0
-        b               1f
+        vld1.32         {dga-dgb}, [r0]
 
         /* load input */
 0:      vld1.32         {q0-q1}, [r1]!
         vld1.32         {q2-q3}, [r1]!
-        subs            r0, r0, #1
+        subs            r2, r2, #1
 
-1:
 #ifndef CONFIG_CPU_BIG_ENDIAN
         vrev32.8        q0, q0
         vrev32.8        q1, q1
@@ -129,6 +120,6 @@ ENTRY(sha2_ce_transform)
         bne             0b
 
         /* store new state */
-        vst1.32         {dga-dgb}, [r2]
+        vst1.32         {dga-dgb}, [r0]
         bx              lr
 ENDPROC(sha2_ce_transform)
diff --git a/arch/arm/crypto/sha2-ce-glue.c b/arch/arm/crypto/sha2-ce-glue.c
index 0449eca3aab3..0755b2d657f3 100644
--- a/arch/arm/crypto/sha2-ce-glue.c
+++ b/arch/arm/crypto/sha2-ce-glue.c
@@ -10,6 +10,7 @@
 
 #include <crypto/internal/hash.h>
 #include <crypto/sha.h>
+#include <crypto/sha256_base.h>
 #include <linux/crypto.h>
 #include <linux/module.h>
 
@@ -18,148 +19,60 @@
 #include <asm/neon.h>
 #include <asm/unaligned.h>
 
+#include "sha256_glue.h"
+
 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
 MODULE_LICENSE("GPL v2");
 
-asmlinkage void sha2_ce_transform(int blocks, u8 const *src, u32 *state,
-                                  u8 *head);
+asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src,
+                                  int blocks);
 
-static int sha224_init(struct shash_desc *desc)
+static int sha2_ce_update(struct shash_desc *desc, const u8 *data,
+                          unsigned int len)
 {
         struct sha256_state *sctx = shash_desc_ctx(desc);
 
-        *sctx = (struct sha256_state){
-                .state = {
-                        SHA224_H0, SHA224_H1, SHA224_H2, SHA224_H3,
-                        SHA224_H4, SHA224_H5, SHA224_H6, SHA224_H7,
-                }
-        };
-        return 0;
-}
+        if (!may_use_simd() ||
+            (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
+                return crypto_sha256_arm_update(desc, data, len);
 
-static int sha256_init(struct shash_desc *desc)
-{
-        struct sha256_state *sctx = shash_desc_ctx(desc);
+        kernel_neon_begin();
+        sha256_base_do_update(desc, data, len,
+                              (sha256_block_fn *)sha2_ce_transform);
+        kernel_neon_end();
 
-        *sctx = (struct sha256_state){
-                .state = {
-                        SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
-                        SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7,
-                }
-        };
         return 0;
 }
 
-static int sha2_update(struct shash_desc *desc, const u8 *data,
-                       unsigned int len)
+static int sha2_ce_finup(struct shash_desc *desc, const u8 *data,
+                         unsigned int len, u8 *out)
 {
-        struct sha256_state *sctx = shash_desc_ctx(desc);
-        unsigned int partial;
-
         if (!may_use_simd())
-                return crypto_sha256_update(desc, data, len);
-
-        partial = sctx->count % SHA256_BLOCK_SIZE;
-        sctx->count += len;
-
-        if ((partial + len) >= SHA256_BLOCK_SIZE) {
-                int blocks;
-
-                if (partial) {
-                        int p = SHA256_BLOCK_SIZE - partial;
-
-                        memcpy(sctx->buf + partial, data, p);
-                        data += p;
-                        len -= p;
-                }
-
-                blocks = len / SHA256_BLOCK_SIZE;
-                len %= SHA256_BLOCK_SIZE;
+                return crypto_sha256_arm_finup(desc, data, len, out);
 
-                kernel_neon_begin();
-                sha2_ce_transform(blocks, data, sctx->state,
-                                  partial ? sctx->buf : NULL);
-                kernel_neon_end();
-
-                data += blocks * SHA256_BLOCK_SIZE;
-                partial = 0;
-        }
+        kernel_neon_begin();
         if (len)
-                memcpy(sctx->buf + partial, data, len);
-        return 0;
-}
-
-static void sha2_final(struct shash_desc *desc)
-{
-        static const u8 padding[SHA256_BLOCK_SIZE] = { 0x80, };
+                sha256_base_do_update(desc, data, len,
+                                      (sha256_block_fn *)sha2_ce_transform);
+        sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
+        kernel_neon_end();
 
-        struct sha256_state *sctx = shash_desc_ctx(desc);
-        __be64 bits = cpu_to_be64(sctx->count << 3);
-        u32 padlen = SHA256_BLOCK_SIZE
-                     - ((sctx->count + sizeof(bits)) % SHA256_BLOCK_SIZE);
-
-        sha2_update(desc, padding, padlen);
-        sha2_update(desc, (const u8 *)&bits, sizeof(bits));
+        return sha256_base_finish(desc, out);
 }
 
-static int sha224_final(struct shash_desc *desc, u8 *out)
+static int sha2_ce_final(struct shash_desc *desc, u8 *out)
 {
-        struct sha256_state *sctx = shash_desc_ctx(desc);
-        __be32 *dst = (__be32 *)out;
-        int i;
-
-        sha2_final(desc);
-
-        for (i = 0; i < SHA224_DIGEST_SIZE / sizeof(__be32); i++)
-                put_unaligned_be32(sctx->state[i], dst++);
-
-        *sctx = (struct sha256_state){};
-        return 0;
-}
-
-static int sha256_final(struct shash_desc *desc, u8 *out)
-{
-        struct sha256_state *sctx = shash_desc_ctx(desc);
-        __be32 *dst = (__be32 *)out;
-        int i;
-
-        sha2_final(desc);
-
-        for (i = 0; i < SHA256_DIGEST_SIZE / sizeof(__be32); i++)
-                put_unaligned_be32(sctx->state[i], dst++);
-
-        *sctx = (struct sha256_state){};
-        return 0;
-}
-
-static int sha2_export(struct shash_desc *desc, void *out)
-{
-        struct sha256_state *sctx = shash_desc_ctx(desc);
-        struct sha256_state *dst = out;
-
-        *dst = *sctx;
-        return 0;
-}
-
-static int sha2_import(struct shash_desc *desc, const void *in)
-{
-        struct sha256_state *sctx = shash_desc_ctx(desc);
-        struct sha256_state const *src = in;
-
-        *sctx = *src;
-        return 0;
+        return sha2_ce_finup(desc, NULL, 0, out);
 }
 
 static struct shash_alg algs[] = { {
-        .init                   = sha224_init,
-        .update                 = sha2_update,
-        .final                  = sha224_final,
-        .export                 = sha2_export,
-        .import                 = sha2_import,
+        .init                   = sha224_base_init,
+        .update                 = sha2_ce_update,
+        .final                  = sha2_ce_final,
+        .finup                  = sha2_ce_finup,
         .descsize               = sizeof(struct sha256_state),
         .digestsize             = SHA224_DIGEST_SIZE,
-        .statesize              = sizeof(struct sha256_state),
         .base                   = {
                 .cra_name               = "sha224",
                 .cra_driver_name        = "sha224-ce",
@@ -169,14 +82,12 @@ static struct shash_alg algs[] = { {
                 .cra_module             = THIS_MODULE,
         }
 }, {
-        .init                   = sha256_init,
-        .update                 = sha2_update,
-        .final                  = sha256_final,
-        .export                 = sha2_export,
-        .import                 = sha2_import,
+        .init                   = sha256_base_init,
+        .update                 = sha2_ce_update,
+        .final                  = sha2_ce_final,
+        .finup                  = sha2_ce_finup,
         .descsize               = sizeof(struct sha256_state),
         .digestsize             = SHA256_DIGEST_SIZE,
-        .statesize              = sizeof(struct sha256_state),
         .base                   = {
                 .cra_name               = "sha256",
                 .cra_driver_name        = "sha256-ce",