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crypto: sha256 - Implement export_core() and import_core()

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Since commit 9d7a0ab1c7 ("crypto: ahash - Handle partial blocks in
API"), the recently-added export_core() and import_core() methods in
struct shash_alg have effectively become mandatory (even though it is
not tested or enforced), since legacy drivers that need a fallback
depend on them.  Make crypto/sha256.c compatible with these legacy
drivers by adding export_core() and import_core() methods to it.

Reported-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reported-by: Ovidiu Panait <ovidiu.panait.oss@gmail.com>
Closes: https://lore.kernel.org/r/aLSnCc9Ws5L9y+8X@gcabiddu-mobl.ger.corp.intel.com
Fixes: 07f090959b ("crypto: sha256 - Use same state format as legacy drivers")
Tested-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Tested-by: Ovidiu Panait <ovidiu.panait.oss@gmail.com>
Link: https://lore.kernel.org/r/20250901165013.48649-3-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers
2025-09-01 09:50:12 -07:00
parent 827733acbe
commit 30b2a8c4f2
1 changed files with 71 additions and 0 deletions
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71
crypto/sha256.c
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@@ -50,6 +50,19 @@ static int __crypto_sha256_import(struct __sha256_ctx *ctx, const void *in)
return 0;
}
static int __crypto_sha256_export_core(const struct __sha256_ctx *ctx,
void *out)
{
memcpy(out, ctx, offsetof(struct __sha256_ctx, buf));
return 0;
}
static int __crypto_sha256_import_core(struct __sha256_ctx *ctx, const void *in)
{
memcpy(ctx, in, offsetof(struct __sha256_ctx, buf));
return 0;
}
/* SHA-224 */
const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {
@@ -98,6 +111,16 @@ static int crypto_sha224_import(struct shash_desc *desc, const void *in)
return __crypto_sha256_import(&SHA224_CTX(desc)->ctx, in);
}
static int crypto_sha224_export_core(struct shash_desc *desc, void *out)
{
return __crypto_sha256_export_core(&SHA224_CTX(desc)->ctx, out);
}
static int crypto_sha224_import_core(struct shash_desc *desc, const void *in)
{
return __crypto_sha256_import_core(&SHA224_CTX(desc)->ctx, in);
}
/* SHA-256 */
const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
@@ -146,6 +169,16 @@ static int crypto_sha256_import(struct shash_desc *desc, const void *in)
return __crypto_sha256_import(&SHA256_CTX(desc)->ctx, in);
}
static int crypto_sha256_export_core(struct shash_desc *desc, void *out)
{
return __crypto_sha256_export_core(&SHA256_CTX(desc)->ctx, out);
}
static int crypto_sha256_import_core(struct shash_desc *desc, const void *in)
{
return __crypto_sha256_import_core(&SHA256_CTX(desc)->ctx, in);
}
/* HMAC-SHA224 */
#define HMAC_SHA224_KEY(tfm) ((struct hmac_sha224_key *)crypto_shash_ctx(tfm))
@@ -198,6 +231,21 @@ static int crypto_hmac_sha224_import(struct shash_desc *desc, const void *in)
return __crypto_sha256_import(&ctx->ctx.sha_ctx, in);
}
static int crypto_hmac_sha224_export_core(struct shash_desc *desc, void *out)
{
return __crypto_sha256_export_core(&HMAC_SHA224_CTX(desc)->ctx.sha_ctx,
out);
}
static int crypto_hmac_sha224_import_core(struct shash_desc *desc,
const void *in)
{
struct hmac_sha224_ctx *ctx = HMAC_SHA224_CTX(desc);
ctx->ctx.ostate = HMAC_SHA224_KEY(desc->tfm)->key.ostate;
return __crypto_sha256_import_core(&ctx->ctx.sha_ctx, in);
}
/* HMAC-SHA256 */
#define HMAC_SHA256_KEY(tfm) ((struct hmac_sha256_key *)crypto_shash_ctx(tfm))
@@ -250,6 +298,21 @@ static int crypto_hmac_sha256_import(struct shash_desc *desc, const void *in)
return __crypto_sha256_import(&ctx->ctx.sha_ctx, in);
}
static int crypto_hmac_sha256_export_core(struct shash_desc *desc, void *out)
{
return __crypto_sha256_export_core(&HMAC_SHA256_CTX(desc)->ctx.sha_ctx,
out);
}
static int crypto_hmac_sha256_import_core(struct shash_desc *desc,
const void *in)
{
struct hmac_sha256_ctx *ctx = HMAC_SHA256_CTX(desc);
ctx->ctx.ostate = HMAC_SHA256_KEY(desc->tfm)->key.ostate;
return __crypto_sha256_import_core(&ctx->ctx.sha_ctx, in);
}
/* Algorithm definitions */
static struct shash_alg algs[] = {
@@ -266,6 +329,8 @@ static struct shash_alg algs[] = {
.digest = crypto_sha224_digest,
.export = crypto_sha224_export,
.import = crypto_sha224_import,
.export_core = crypto_sha224_export_core,
.import_core = crypto_sha224_import_core,
.descsize = sizeof(struct sha224_ctx),
.statesize = SHA256_SHASH_STATE_SIZE,
},
@@ -282,6 +347,8 @@ static struct shash_alg algs[] = {
.digest = crypto_sha256_digest,
.export = crypto_sha256_export,
.import = crypto_sha256_import,
.export_core = crypto_sha256_export_core,
.import_core = crypto_sha256_import_core,
.descsize = sizeof(struct sha256_ctx),
.statesize = SHA256_SHASH_STATE_SIZE,
},
@@ -300,6 +367,8 @@ static struct shash_alg algs[] = {
.digest = crypto_hmac_sha224_digest,
.export = crypto_hmac_sha224_export,
.import = crypto_hmac_sha224_import,
.export_core = crypto_hmac_sha224_export_core,
.import_core = crypto_hmac_sha224_import_core,
.descsize = sizeof(struct hmac_sha224_ctx),
.statesize = SHA256_SHASH_STATE_SIZE,
},
@@ -318,6 +387,8 @@ static struct shash_alg algs[] = {
.digest = crypto_hmac_sha256_digest,
.export = crypto_hmac_sha256_export,
.import = crypto_hmac_sha256_import,
.export_core = crypto_hmac_sha256_export_core,
.import_core = crypto_hmac_sha256_import_core,
.descsize = sizeof(struct hmac_sha256_ctx),
.statesize = SHA256_SHASH_STATE_SIZE,
},