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[DRAFT] Add digest context copy function #158

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[DRAFT] Add digest context copy function #158

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5efbe03
Support new digest copy context function
mamckee Jan 14, 2026
178e534
Only compile new functions where supported
mamckee Jan 26, 2026
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11 changes: 11 additions & 0 deletions SymCryptProvider/src/digests/p_scossl_digest_common.c
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,17 @@ SCOSSL_DIGEST_CTX *p_scossl_digest_dupctx(SCOSSL_DIGEST_CTX *ctx)
return copyCtx;
}

#ifdef OSSL_FUNC_DIGEST_COPYCTX
_Use_decl_annotations_
void p_scossl_digest_copy_ctx(SCOSSL_DIGEST_CTX *dstCtx, SCOSSL_DIGEST_CTX *srcCtx)
{
dstCtx->pHash = srcCtx->pHash;
dstCtx->xofLen = srcCtx->xofLen;

srcCtx->pHash->stateCopyFunc(srcCtx->pState, dstCtx->pState);
}
#endif

_Use_decl_annotations_
SCOSSL_STATUS p_scossl_digest_get_params(OSSL_PARAM params[], size_t size, size_t blocksize, UINT32 flags)
{
Expand Down
43 changes: 32 additions & 11 deletions SymCryptProvider/src/digests/p_scossl_digest_common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,9 @@ typedef struct

SCOSSL_DIGEST_CTX *p_scossl_digest_dupctx(_In_ SCOSSL_DIGEST_CTX *ctx);
void p_scossl_digest_freectx(_Inout_ SCOSSL_DIGEST_CTX *ctx);
#ifdef OSSL_FUNC_DIGEST_COPYCTX
void p_scossl_digest_copy_ctx(_Inout_ SCOSSL_DIGEST_CTX *dstCtx, _In_ SCOSSL_DIGEST_CTX *srcCtx);
#endif

SCOSSL_STATUS p_scossl_digest_update(_Inout_ SCOSSL_DIGEST_CTX *ctx,
_In_reads_bytes_(inl) const unsigned char *in, size_t inl);
Expand All @@ -33,7 +36,7 @@ SCOSSL_STATUS p_scossl_digest_digest(_In_ PCSYMCRYPT_HASH pHash,
SCOSSL_STATUS p_scossl_digest_get_params(_Inout_ OSSL_PARAM params[], size_t size, size_t blocksize, UINT32 flags);
const OSSL_PARAM *p_scossl_digest_gettable_params(ossl_unused void *ctx, ossl_unused void *provctx);

#define SCOSSL_DIGEST_FUNCTIONS_COMMON(alg, dispatch_name, flags) \
#define IMPLEMENT_SCOSSL_DIGEST_FUNCTIONS_COMMON(alg, dispatch_name, flags) \
static SCOSSL_DIGEST_CTX *p_scossl_##dispatch_name##_newctx(ossl_unused void *prov_ctx) \
{ \
SCOSSL_DIGEST_CTX *ctx = OPENSSL_malloc(sizeof(SCOSSL_DIGEST_CTX)); \
Expand Down Expand Up @@ -74,16 +77,34 @@ const OSSL_PARAM *p_scossl_digest_gettable_params(ossl_unused void *ctx, ossl_un
SymCryptHashResultSize(SymCrypt##alg##Algorithm), \
SymCryptHashInputBlockSize(SymCrypt##alg##Algorithm), \
flags); \
} \
\
const OSSL_DISPATCH p_scossl_##dispatch_name##_functions[] = { \
{OSSL_FUNC_DIGEST_NEWCTX, (void (*)(void))p_scossl_##dispatch_name##_newctx}, \
{OSSL_FUNC_DIGEST_FREECTX, (void (*)(void))p_scossl_digest_freectx}, \
{OSSL_FUNC_DIGEST_DUPCTX, (void (*)(void))p_scossl_digest_dupctx}, \
{OSSL_FUNC_DIGEST_GET_PARAMS, (void (*)(void))p_scossl_##dispatch_name##_get_params}, \
{OSSL_FUNC_DIGEST_GETTABLE_PARAMS, (void (*)(void))p_scossl_digest_gettable_params}, \
{OSSL_FUNC_DIGEST_UPDATE, (void (*)(void))p_scossl_digest_update}, \
{OSSL_FUNC_DIGEST_DIGEST, (void (*)(void))p_scossl_##dispatch_name##_digest},
}

#ifdef OSSL_FUNC_DIGEST_COPYCTX
#define SCOSSL_DIGEST_FUNCTIONS_COMMON(alg, dispatch_name, flags) \
IMPLEMENT_SCOSSL_DIGEST_FUNCTIONS_COMMON(alg, dispatch_name, flags) \
\
const OSSL_DISPATCH p_scossl_##dispatch_name##_functions[] = { \
{OSSL_FUNC_DIGEST_NEWCTX, (void (*)(void))p_scossl_##dispatch_name##_newctx}, \
{OSSL_FUNC_DIGEST_FREECTX, (void (*)(void))p_scossl_digest_freectx}, \
{OSSL_FUNC_DIGEST_DUPCTX, (void (*)(void))p_scossl_digest_dupctx}, \
{OSSL_FUNC_DIGEST_COPYCTX, (void (*)(void))p_scossl_digest_copy_ctx}, \
{OSSL_FUNC_DIGEST_GET_PARAMS, (void (*)(void))p_scossl_##dispatch_name##_get_params}, \
{OSSL_FUNC_DIGEST_GETTABLE_PARAMS, (void (*)(void))p_scossl_digest_gettable_params}, \
{OSSL_FUNC_DIGEST_UPDATE, (void (*)(void))p_scossl_digest_update}, \
{OSSL_FUNC_DIGEST_DIGEST, (void (*)(void))p_scossl_##dispatch_name##_digest},
#else
#define SCOSSL_DIGEST_FUNCTIONS_COMMON(alg, dispatch_name, flags) \
IMPLEMENT_SCOSSL_DIGEST_FUNCTIONS_COMMON(alg, dispatch_name, flags) \
\
const OSSL_DISPATCH p_scossl_##dispatch_name##_functions[] = { \
{OSSL_FUNC_DIGEST_NEWCTX, (void (*)(void))p_scossl_##dispatch_name##_newctx}, \
{OSSL_FUNC_DIGEST_FREECTX, (void (*)(void))p_scossl_digest_freectx}, \
{OSSL_FUNC_DIGEST_DUPCTX, (void (*)(void))p_scossl_digest_dupctx}, \
{OSSL_FUNC_DIGEST_GET_PARAMS, (void (*)(void))p_scossl_##dispatch_name##_get_params}, \
{OSSL_FUNC_DIGEST_GETTABLE_PARAMS, (void (*)(void))p_scossl_digest_gettable_params}, \
{OSSL_FUNC_DIGEST_UPDATE, (void (*)(void))p_scossl_digest_update}, \
{OSSL_FUNC_DIGEST_DIGEST, (void (*)(void))p_scossl_##dispatch_name##_digest},
#endif

#define SCOSSL_DIGEST_FUNCTIONS_END \
{0, NULL}};
Expand Down