xref: /isa-l_crypto/include/sha256_mb.h (revision 672a042c19c7c87254f91480c1dd123e38f226e0)

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#ifndef _SHA256_MB_H_
#define _SHA256_MB_H_

/**
 *  @file sha256_mb.h
 *  @brief Multi-buffer CTX API SHA256 function prototypes and structures
 *
 * Interface for multi-buffer SHA256 functions
 *
 * <b> Multi-buffer SHA256  Entire or First-Update..Update-Last </b>
 *
 * The interface to this multi-buffer hashing code is carried out through the
 * context-level (CTX) init, submit and flush functions and the ISAL_SHA256_HASH_CTX_MGR and
 * ISAL_SHA256_HASH_CTX objects. Numerous ISAL_SHA256_HASH_CTX objects may be instantiated by the
 * application for use with a single ISAL_SHA256_HASH_CTX_MGR.
 *
 * The CTX interface functions carry out the initialization and padding of the jobs
 * entered by the user and add them to the multi-buffer manager. The lower level "scheduler"
 * layer then processes the jobs in an out-of-order manner. The scheduler layer functions
 * are internal and are not intended to be invoked directly. Jobs can be submitted
 * to a CTX as a complete buffer to be hashed, using the ISAL_HASH_ENTIRE flag, or as partial
 * jobs which can be started using the ISAL_HASH_FIRST flag, and later resumed or finished
 * using the ISAL_HASH_UPDATE and ISAL_HASH_LAST flags respectively.
 *
 * <b>Note:</b> The submit function does not require data buffers to be block sized.
 *
 * The SHA256 CTX interface functions are available for 4 architectures: SSE, AVX, AVX2 and
 * AVX512. In addition, a multibinary interface is provided, which selects the appropriate
 * architecture-specific function at runtime.
 *
 * <b>Usage:</b> The application creates a ISAL_SHA256_HASH_CTX_MGR object and initializes it
 * with a call to sha256_ctx_mgr_init*() function, where henceforth "*" stands for the
 * relevant suffix for each architecture; _sse, _avx, _avx2, _avx512(or no suffix for the
 * multibinary version). The ISAL_SHA256_HASH_CTX_MGR object will be used to schedule processor
 * resources, with up to 4 ISAL_SHA256_HASH_CTX objects (or 8 in the AVX2 case, 16 in the AVX512)
 * being processed at a time.
 *
 * Each ISAL_SHA256_HASH_CTX must be initialized before first use by the isal_hash_ctx_init macro
 * defined in multi_buffer.h. After initialization, the application may begin computing
 * a hash by giving the ISAL_SHA256_HASH_CTX to a ISAL_SHA256_HASH_CTX_MGR using the submit
 * functions sha256_ctx_mgr_submit*() with the ISAL_HASH_FIRST flag set. When the
 * ISAL_SHA256_HASH_CTX is returned to the application (via this or a later call to
 * sha256_ctx_mgr_submit*() or sha256_ctx_mgr_flush*()), the application can then re-submit it with
 * another call to sha256_ctx_mgr_submit*(), but without the ISAL_HASH_FIRST flag set.
 *
 * Ideally, on the last buffer for that hash, sha256_ctx_mgr_submit is called with
 * ISAL_HASH_LAST, although it is also possible to submit the hash with ISAL_HASH_LAST and a zero
 * length if necessary. When a ISAL_SHA256_HASH_CTX is returned after having been submitted with
 * ISAL_HASH_LAST, it will contain a valid hash. The ISAL_SHA256_HASH_CTX can be reused immediately
 * by submitting with ISAL_HASH_FIRST.
 *
 * For example, you would submit hashes with the following flags for the following numbers
 * of buffers:
 * <ul>
 *  <li> one buffer: ISAL_HASH_FIRST | ISAL_HASH_LAST  (or, equivalently, ISAL_HASH_ENTIRE)
 *  <li> two buffers: ISAL_HASH_FIRST, ISAL_HASH_LAST
 *  <li> three buffers: ISAL_HASH_FIRST, ISAL_HASH_UPDATE, ISAL_HASH_LAST
 * etc.
 * </ul>
 *
 * The order in which SHA256_CTX objects are returned is in general different from the order
 * in which they are submitted.
 *
 * A few possible error conditions exist:
 * <ul>
 *  <li> Submitting flags other than the allowed entire/first/update/last values
 *  <li> Submitting a context that is currently being managed by a ISAL_SHA256_HASH_CTX_MGR.
 *  <li> Submitting a context after ISAL_HASH_LAST is used but before ISAL_HASH_FIRST is set.
 * </ul>
 *
 *  These error conditions are reported by returning the ISAL_SHA256_HASH_CTX immediately after
 *  a submit with its error member set to a non-zero error code (defined in
 *  multi_buffer.h). No changes are made to the ISAL_SHA256_HASH_CTX_MGR in the case of an
 *  error; no processing is done for other hashes.
 *
 */

#include <stdint.h>
#include <string.h>
#include "multi_buffer.h"
#include "types.h"

#ifndef _MSC_VER
#include <stdbool.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Define enums from API v2.24, so applications that were using this version
 * will still be compiled successfully.
 * This list does not need to be extended for new definitions.
 */
#ifndef NO_COMPAT_ISAL_CRYPTO_API_2_24
/***** Previous hash constants and typedefs *****/
#define SHA256_DIGEST_NWORDS       ISAL_SHA256_DIGEST_NWORDS
#define SHA256_PADLENGTHFIELD_SIZE ISAL_SHA256_PADLENGTHFIELD_SIZE
#define SHA256_MAX_LANES           ISAL_SHA256_MAX_LANES
#define SHA256_MIN_LANES           ISAL_SHA256_MIN_LANES
#define SHA256_BLOCK_SIZE          ISAL_SHA256_BLOCK_SIZE
#define SHA256_WORD_T              ISAL_SHA256_WORD_T

/***** Previous structure definitions *****/
#define SHA256_JOB          ISAL_SHA256_JOB
#define SHA256_MB_ARGS_X16  ISAL_SHA256_MB_ARGS_X16
#define SHA256_LANE_DATA    ISAL_SHA256_LANE_DATA
#define SHA256_MB_JOB_MGR   ISAL_SHA256_MB_JOB_MGR
#define SHA256_HASH_CTX_MGR ISAL_SHA256_HASH_CTX_MGR
#define SHA256_HASH_CTX     ISAL_SHA256_HASH_CTX
#endif /* !NO_COMPAT_ISAL_CRYPTO_API_2_24 */

// Hash Constants and Typedefs
#define ISAL_SHA256_DIGEST_NWORDS       8
#define ISAL_SHA256_MAX_LANES           16
#define ISAL_SHA256_MIN_LANES           4
#define ISAL_SHA256_BLOCK_SIZE          64
#define ISAL_SHA256_PADLENGTHFIELD_SIZE 8

typedef uint32_t sha256_digest_array[ISAL_SHA256_DIGEST_NWORDS][ISAL_SHA256_MAX_LANES];
typedef uint32_t ISAL_SHA256_WORD_T;

/** @brief Scheduler layer - Holds info describing a single SHA256 job for the multi-buffer manager
 */

typedef struct {
        uint8_t *buffer; //!< pointer to data buffer for this job
        uint64_t len;    //!< length of buffer for this job in blocks.
        DECLARE_ALIGNED(uint32_t result_digest[ISAL_SHA256_DIGEST_NWORDS], 64);
        ISAL_JOB_STS status; //!< output job status
        void *user_data;     //!< pointer for user's job-related data
} ISAL_SHA256_JOB;

/** @brief Scheduler layer -  Holds arguments for submitted SHA256 job */

typedef struct {
        sha256_digest_array digest;
        uint8_t *data_ptr[ISAL_SHA256_MAX_LANES];
} ISAL_SHA256_MB_ARGS_X16;

/** @brief Scheduler layer - Lane data */

typedef struct {
        ISAL_SHA256_JOB *job_in_lane;
} ISAL_SHA256_LANE_DATA;

/** @brief Scheduler layer - Holds state for multi-buffer SHA256 jobs */

typedef struct {
        ISAL_SHA256_MB_ARGS_X16 args;
        DECLARE_ALIGNED(uint32_t lens[ISAL_SHA256_MAX_LANES], 16);
        uint64_t unused_lanes; //!< each nibble is index (0...3 or 0...7) of unused lanes, nibble 4
                               //!< or 8 is set to F as a flag
        ISAL_SHA256_LANE_DATA ldata[ISAL_SHA256_MAX_LANES];
        uint32_t num_lanes_inuse;
} ISAL_SHA256_MB_JOB_MGR;

/** @brief Context layer - Holds state for multi-buffer SHA256 jobs */

typedef struct {
        ISAL_SHA256_MB_JOB_MGR mgr;
} ISAL_SHA256_HASH_CTX_MGR;

/** @brief Context layer - Holds info describing a single SHA256 job for the multi-buffer CTX
 * manager This structure must be allocated to 16-byte aligned memory */

typedef struct {
        ISAL_SHA256_JOB job;             // Must be at struct offset 0.
        ISAL_HASH_CTX_STS status;        //!< Context status flag
        ISAL_HASH_CTX_ERROR error;       //!< Context error flag
        uint64_t total_length;           //!< Running counter of length processed for this CTX's job
        const void *incoming_buffer;     //!< pointer to data input buffer for this CTX's job
        uint32_t incoming_buffer_length; //!< length of buffer for this job in bytes.
        uint8_t partial_block_buffer[ISAL_SHA256_BLOCK_SIZE * 2]; //!< CTX partial blocks
        uint32_t partial_block_buffer_length;
        void *user_data; //!< pointer for user to keep any job-related data
} ISAL_SHA256_HASH_CTX;

/******************** multibinary function prototypes **********************/

/**
 * @brief Initialize the SHA256 multi-buffer manager structure.
 * @requires SSE4.1 or AVX or AVX2
 * @deprecated Please use isal_sha256_ctx_mgr_init() instead.
 *
 * @param mgr	Structure holding context level state info
 * @returns void
 */
ISAL_DEPRECATED("Please use isal_sha256_ctx_mgr_init() instead")
void
sha256_ctx_mgr_init(ISAL_SHA256_HASH_CTX_MGR *mgr);

/**
 * @brief  Submit a new SHA256 job to the multi-buffer manager.
 * @requires SSE4.1 or AVX or AVX2
 * @deprecated Please use isal_sha256_ctx_mgr_submit() instead.
 *
 * @param  mgr Structure holding context level state info
 * @param  ctx Structure holding ctx job info
 * @param  buffer Pointer to buffer to be processed
 * @param  len Length of buffer (in bytes) to be processed
 * @param  flags Input flag specifying job type (first, update, last or entire)
 * @returns NULL if no jobs complete or pointer to jobs structure.
 */
ISAL_DEPRECATED("Please use isal_sha256_ctx_mgr_submit() instead")
ISAL_SHA256_HASH_CTX *
sha256_ctx_mgr_submit(ISAL_SHA256_HASH_CTX_MGR *mgr, ISAL_SHA256_HASH_CTX *ctx, const void *buffer,
                      uint32_t len, ISAL_HASH_CTX_FLAG flags);

/**
 * @brief Finish all submitted SHA256 jobs and return when complete.
 * @requires SSE4.1 or AVX or AVX2
 * @deprecated Please use isal_sha256_ctx_mgr_flush() instead.
 *
 * @param mgr	Structure holding context level state info
 * @returns NULL if no jobs to complete or pointer to jobs structure.
 */
ISAL_DEPRECATED("Please use isal_sha256_ctx_mgr_flush() instead")
ISAL_SHA256_HASH_CTX *
sha256_ctx_mgr_flush(ISAL_SHA256_HASH_CTX_MGR *mgr);

/**
 * @brief Initialize the SHA256 multi-buffer manager structure.
 * @requires SSE4.1 for x86 or ASIMD for ARM
 *
 * @param[in] mgr Structure holding context level state info
 * @return Operation status
 * @retval 0 on success
 * @retval Non-zero \a ISAL_CRYPTO_ERR on failure
 */
int
isal_sha256_ctx_mgr_init(ISAL_SHA256_HASH_CTX_MGR *mgr);

/**
 * @brief  Submit a new SHA256 job to the multi-buffer manager.
 * @requires SSE4.1 for x86 or ASIMD for ARM
 *
 * @param[in] mgr Structure holding context level state info
 * @param[in] ctx_in Structure holding ctx job info
 * @param[out] ctx_out	Pointer address to output job ctx info.
 *			Modified to point to completed job structure or
 *			NULL if no jobs completed.
 * @param[in] buffer Pointer to buffer to be processed
 * @param[in] len Length of buffer (in bytes) to be processed
 * @param[in] flags Input flag specifying job type (first, update, last or entire)
 * @return Operation status
 * @retval 0 on success
 * @retval Non-zero \a ISAL_CRYPTO_ERR on failure
 */
int
isal_sha256_ctx_mgr_submit(ISAL_SHA256_HASH_CTX_MGR *mgr, ISAL_SHA256_HASH_CTX *ctx_in,
                           ISAL_SHA256_HASH_CTX **ctx_out, const void *buffer, const uint32_t len,
                           const ISAL_HASH_CTX_FLAG flags);

/**
 * @brief Finish all submitted SHA256 jobs and return when complete.
 * @requires SSE4.1 for x86 or ASIMD for ARM
 *
 * @param[in] mgr Structure holding context level state info
 * @param[out] ctx_out	Pointer address to output job ctx info.
 *			Modified to point to completed job structure or
 *			NULL if no jobs completed.
 * @return Operation status
 * @retval 0 on success
 * @retval Non-zero \a ISAL_CRYPTO_ERR on failure
 */
int
isal_sha256_ctx_mgr_flush(ISAL_SHA256_HASH_CTX_MGR *mgr, ISAL_SHA256_HASH_CTX **ctx_out);
#ifdef __cplusplus
}
#endif

#endif // _SHA256_MB_H_