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crypto: sha512 - Use same state format as legacy drivers

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Make the export and import functions for the sha384, sha512,
hmac(sha384), and hmac(sha512) shash algorithms use the same format as
the padlock-sha and nx-sha512 drivers, as required by Herbert.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20250630160320.2888-7-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Eric Biggers 2025-06-30 09:03:10 -07:00
parent 469acaa125
commit 4bc7f7b687
1 changed files with 96 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

96
crypto/sha512.c
View file

@ -12,6 +12,44 @@
#include <linux/kernel.h>
#include <linux/module.h>
/*
* Export and import functions. crypto_shash wants a particular format that
* matches that used by some legacy drivers. It currently is the same as the
* library SHA context, except the value in bytecount_lo must be block-aligned
* and the remainder must be stored in an extra u8 appended to the struct.
*/
#define SHA512_SHASH_STATE_SIZE 209
static_assert(offsetof(struct __sha512_ctx, state) == 0);
static_assert(offsetof(struct __sha512_ctx, bytecount_lo) == 64);
static_assert(offsetof(struct __sha512_ctx, bytecount_hi) == 72);
static_assert(offsetof(struct __sha512_ctx, buf) == 80);
static_assert(sizeof(struct __sha512_ctx) + 1 == SHA512_SHASH_STATE_SIZE);
static int __crypto_sha512_export(const struct __sha512_ctx *ctx0, void *out)
{
struct __sha512_ctx ctx = *ctx0;
unsigned int partial;
u8 *p = out;
partial = ctx.bytecount_lo % SHA512_BLOCK_SIZE;
ctx.bytecount_lo -= partial;
memcpy(p, &ctx, sizeof(ctx));
p += sizeof(ctx);
*p = partial;
return 0;
}
static int __crypto_sha512_import(struct __sha512_ctx *ctx, const void *in)
{
const u8 *p = in;
memcpy(ctx, p, sizeof(*ctx));
p += sizeof(*ctx);
ctx->bytecount_lo += *p;
return 0;
}
/* SHA-384 */
const u8 sha384_zero_message_hash[SHA384_DIGEST_SIZE] = {
@ -52,6 +90,16 @@ static int crypto_sha384_digest(struct shash_desc *desc,
return 0;
}
static int crypto_sha384_export(struct shash_desc *desc, void *out)
{
return __crypto_sha512_export(&SHA384_CTX(desc)->ctx, out);
}
static int crypto_sha384_import(struct shash_desc *desc, const void *in)
{
return __crypto_sha512_import(&SHA384_CTX(desc)->ctx, in);
}
/* SHA-512 */
const u8 sha512_zero_message_hash[SHA512_DIGEST_SIZE] = {
@ -94,6 +142,16 @@ static int crypto_sha512_digest(struct shash_desc *desc,
return 0;
}
static int crypto_sha512_export(struct shash_desc *desc, void *out)
{
return __crypto_sha512_export(&SHA512_CTX(desc)->ctx, out);
}
static int crypto_sha512_import(struct shash_desc *desc, const void *in)
{
return __crypto_sha512_import(&SHA512_CTX(desc)->ctx, in);
}
/* HMAC-SHA384 */
#define HMAC_SHA384_KEY(tfm) ((struct hmac_sha384_key *)crypto_shash_ctx(tfm))
@ -133,6 +191,19 @@ static int crypto_hmac_sha384_digest(struct shash_desc *desc,
return 0;
}
static int crypto_hmac_sha384_export(struct shash_desc *desc, void *out)
{
return __crypto_sha512_export(&HMAC_SHA384_CTX(desc)->ctx.sha_ctx, out);
}
static int crypto_hmac_sha384_import(struct shash_desc *desc, const void *in)
{
struct hmac_sha384_ctx *ctx = HMAC_SHA384_CTX(desc);
ctx->ctx.ostate = HMAC_SHA384_KEY(desc->tfm)->key.ostate;
return __crypto_sha512_import(&ctx->ctx.sha_ctx, in);
}
/* HMAC-SHA512 */
#define HMAC_SHA512_KEY(tfm) ((struct hmac_sha512_key *)crypto_shash_ctx(tfm))
@ -172,6 +243,19 @@ static int crypto_hmac_sha512_digest(struct shash_desc *desc,
return 0;
}
static int crypto_hmac_sha512_export(struct shash_desc *desc, void *out)
{
return __crypto_sha512_export(&HMAC_SHA512_CTX(desc)->ctx.sha_ctx, out);
}
static int crypto_hmac_sha512_import(struct shash_desc *desc, const void *in)
{
struct hmac_sha512_ctx *ctx = HMAC_SHA512_CTX(desc);
ctx->ctx.ostate = HMAC_SHA512_KEY(desc->tfm)->key.ostate;
return __crypto_sha512_import(&ctx->ctx.sha_ctx, in);
}
/* Algorithm definitions */
static struct shash_alg algs[] = {
@ -186,7 +270,10 @@ static struct shash_alg algs[] = {
.update = crypto_sha384_update,
.final = crypto_sha384_final,
.digest = crypto_sha384_digest,
.export = crypto_sha384_export,
.import = crypto_sha384_import,
.descsize = sizeof(struct sha384_ctx),
.statesize = SHA512_SHASH_STATE_SIZE,
},
{
.base.cra_name = "sha512",
@ -199,7 +286,10 @@ static struct shash_alg algs[] = {
.update = crypto_sha512_update,
.final = crypto_sha512_final,
.digest = crypto_sha512_digest,
.export = crypto_sha512_export,
.import = crypto_sha512_import,
.descsize = sizeof(struct sha512_ctx),
.statesize = SHA512_SHASH_STATE_SIZE,
},
{
.base.cra_name = "hmac(sha384)",
@ -214,7 +304,10 @@ static struct shash_alg algs[] = {
.update = crypto_hmac_sha384_update,
.final = crypto_hmac_sha384_final,
.digest = crypto_hmac_sha384_digest,
.export = crypto_hmac_sha384_export,
.import = crypto_hmac_sha384_import,
.descsize = sizeof(struct hmac_sha384_ctx),
.statesize = SHA512_SHASH_STATE_SIZE,
},
{
.base.cra_name = "hmac(sha512)",
@ -229,7 +322,10 @@ static struct shash_alg algs[] = {
.update = crypto_hmac_sha512_update,
.final = crypto_hmac_sha512_final,
.digest = crypto_hmac_sha512_digest,
.export = crypto_hmac_sha512_export,
.import = crypto_hmac_sha512_import,
.descsize = sizeof(struct hmac_sha512_ctx),
.statesize = SHA512_SHASH_STATE_SIZE,
},
};