crypto: arm64/crc32 - bring in line with generic CRC32

The arm64 CRC32 (not CRC32c) implementation was not quite doing
the same thing as the generic one. Fix that.

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

diff --git a/arch/arm64/crypto/crc32-arm64.c b/arch/arm64/crypto/crc32-arm64.c
index 9499199..6a37c3c 100644 (file)
--- a/arch/arm64/crypto/crc32-arm64.c
+++ b/arch/arm64/crypto/crc32-arm64.c
@@ -147,13 +147,21 @@ static int chksum_final(struct shash_desc *desc, u8 *out)
 {
        struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
 
+       put_unaligned_le32(ctx->crc, out);
+       return 0;
+}
+
+static int chksumc_final(struct shash_desc *desc, u8 *out)
+{
+       struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
+
        put_unaligned_le32(~ctx->crc, out);
        return 0;
 }
 
 static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
 {
-       put_unaligned_le32(~crc32_arm64_le_hw(crc, data, len), out);
+       put_unaligned_le32(crc32_arm64_le_hw(crc, data, len), out);
        return 0;
 }
 
@@ -199,6 +207,14 @@ static int crc32_cra_init(struct crypto_tfm *tfm)
 {
        struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
 
+       mctx->key = 0;
+       return 0;
+}
+
+static int crc32c_cra_init(struct crypto_tfm *tfm)
+{
+       struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
+
        mctx->key = ~0;
        return 0;
 }
@@ -229,7 +245,7 @@ static struct shash_alg crc32c_alg = {
        .setkey                 =       chksum_setkey,
        .init                   =       chksum_init,
        .update                 =       chksumc_update,
-       .final                  =       chksum_final,
+       .final                  =       chksumc_final,
        .finup                  =       chksumc_finup,
        .digest                 =       chksumc_digest,
        .descsize               =       sizeof(struct chksum_desc_ctx),
@@ -241,7 +257,7 @@ static struct shash_alg crc32c_alg = {
                .cra_alignmask          =       0,
                .cra_ctxsize            =       sizeof(struct chksum_ctx),
                .cra_module             =       THIS_MODULE,
-               .cra_init               =       crc32_cra_init,
+               .cra_init               =       crc32c_cra_init,
        }
 };