diff options
| -rw-r--r-- | crypto/sha512.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/crypto/sha512.c b/crypto/sha512.c index d1e5400fe590..fb1c520978ef 100644 --- a/crypto/sha512.c +++ b/crypto/sha512.c @@ -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, }, }; |