xref: /isa-l_crypto/sha256_mb/sha256_ctx_avx.c (revision 0a437795c8360736f38dfa5934aa03a1861d784c)

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  modification, are permitted provided that the following conditions
  are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
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      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#if defined(__clang__)
#pragma clang attribute push(__attribute__((target("avx"))), apply_to = function)
#elif defined(__ICC)
#pragma intel optimization_parameter target_arch = AVX
#elif defined(__ICL)
#pragma[intel] optimization_parameter target_arch = AVX
#elif (__GNUC__ >= 5)
#pragma GCC target("avx")
#endif

#include "sha256_mb_internal.h"
#include "memcpy_inline.h"
#include "endian_helper.h"

#ifdef _MSC_VER
#include <intrin.h>
#define inline __inline
#endif

static inline void
hash_init_digest(ISAL_SHA256_WORD_T *digest);
static inline uint32_t
hash_pad(uint8_t padblock[ISAL_SHA256_BLOCK_SIZE * 2], uint64_t total_len);
static ISAL_SHA256_HASH_CTX *
sha256_ctx_mgr_resubmit(ISAL_SHA256_HASH_CTX_MGR *mgr, ISAL_SHA256_HASH_CTX *ctx);

void
_sha256_ctx_mgr_init_avx(ISAL_SHA256_HASH_CTX_MGR *mgr)
{
        _sha256_mb_mgr_init_avx(&mgr->mgr);
}

ISAL_SHA256_HASH_CTX *
_sha256_ctx_mgr_submit_avx(ISAL_SHA256_HASH_CTX_MGR *mgr, ISAL_SHA256_HASH_CTX *ctx,
                           const void *buffer, uint32_t len, ISAL_HASH_CTX_FLAG flags)
{
        if (flags & (~ISAL_HASH_ENTIRE)) {
                // User should not pass anything other than FIRST, UPDATE, or LAST
                ctx->error = ISAL_HASH_CTX_ERROR_INVALID_FLAGS;
                return ctx;
        }

        if (ctx->status & ISAL_HASH_CTX_STS_PROCESSING) {
                // Cannot submit to a currently processing job.
                ctx->error = ISAL_HASH_CTX_ERROR_ALREADY_PROCESSING;
                return ctx;
        }

        if ((ctx->status & ISAL_HASH_CTX_STS_COMPLETE) && !(flags & ISAL_HASH_FIRST)) {
                // Cannot update a finished job.
                ctx->error = ISAL_HASH_CTX_ERROR_ALREADY_COMPLETED;
                return ctx;
        }

        if (flags & ISAL_HASH_FIRST) {
                // Init digest
                hash_init_digest(ctx->job.result_digest);

                // Reset byte counter
                ctx->total_length = 0;

                // Clear extra blocks
                ctx->partial_block_buffer_length = 0;
        }
        // If we made it here, there were no errors during this call to submit
        ctx->error = ISAL_HASH_CTX_ERROR_NONE;

        // Store buffer ptr info from user
        ctx->incoming_buffer = buffer;
        ctx->incoming_buffer_length = len;

        // Store the user's request flags and mark this ctx as currently being processed.
        ctx->status = (flags & ISAL_HASH_LAST) ? (ISAL_HASH_CTX_STS) (ISAL_HASH_CTX_STS_PROCESSING |
                                                                      ISAL_HASH_CTX_STS_LAST)
                                               : ISAL_HASH_CTX_STS_PROCESSING;

        // Advance byte counter
        ctx->total_length += len;

        // If there is anything currently buffered in the extra blocks, append to it until it
        // contains a whole block. Or if the user's buffer contains less than a whole block, append
        // as much as possible to the extra block.
        if ((ctx->partial_block_buffer_length) | (len < ISAL_SHA256_BLOCK_SIZE)) {
                // Compute how many bytes to copy from user buffer into extra block
                uint32_t copy_len = ISAL_SHA256_BLOCK_SIZE - ctx->partial_block_buffer_length;
                if (len < copy_len)
                        copy_len = len;

                if (copy_len) {
                        // Copy and update relevant pointers and counters
                        memcpy_varlen(&ctx->partial_block_buffer[ctx->partial_block_buffer_length],
                                      buffer, copy_len);

                        ctx->partial_block_buffer_length += copy_len;
                        ctx->incoming_buffer = (const void *) ((const char *) buffer + copy_len);
                        ctx->incoming_buffer_length = len - copy_len;
                }
                // The extra block should never contain more than 1 block here
                assert(ctx->partial_block_buffer_length <= ISAL_SHA256_BLOCK_SIZE);

                // If the extra block buffer contains exactly 1 block, it can be hashed.
                if (ctx->partial_block_buffer_length >= ISAL_SHA256_BLOCK_SIZE) {
                        ctx->partial_block_buffer_length = 0;

                        ctx->job.buffer = ctx->partial_block_buffer;
                        ctx->job.len = 1;
                        ctx = (ISAL_SHA256_HASH_CTX *) _sha256_mb_mgr_submit_avx(&mgr->mgr,
                                                                                 &ctx->job);
                }
        }

        return sha256_ctx_mgr_resubmit(mgr, ctx);
}

ISAL_SHA256_HASH_CTX *
_sha256_ctx_mgr_flush_avx(ISAL_SHA256_HASH_CTX_MGR *mgr)
{
        ISAL_SHA256_HASH_CTX *ctx;

        while (1) {
                ctx = (ISAL_SHA256_HASH_CTX *) _sha256_mb_mgr_flush_avx(&mgr->mgr);

                // If flush returned 0, there are no more jobs in flight.
                if (!ctx)
                        return NULL;

                // If flush returned a job, verify that it is safe to return to the user.
                // If it is not ready, resubmit the job to finish processing.
                ctx = sha256_ctx_mgr_resubmit(mgr, ctx);

                // If sha256_ctx_mgr_resubmit returned a job, it is ready to be returned.
                if (ctx)
                        return ctx;

                // Otherwise, all jobs currently being managed by the ISAL_SHA256_HASH_CTX_MGR still
                // need processing. Loop.
        }
}

static ISAL_SHA256_HASH_CTX *
sha256_ctx_mgr_resubmit(ISAL_SHA256_HASH_CTX_MGR *mgr, ISAL_SHA256_HASH_CTX *ctx)
{
        while (ctx) {
                if (ctx->status & ISAL_HASH_CTX_STS_COMPLETE) {
                        ctx->status = ISAL_HASH_CTX_STS_COMPLETE; // Clear PROCESSING bit
                        return ctx;
                }
                // If the extra blocks are empty, begin hashing what remains in the user's buffer.
                if (ctx->partial_block_buffer_length == 0 && ctx->incoming_buffer_length) {
                        const void *buffer = ctx->incoming_buffer;
                        uint32_t len = ctx->incoming_buffer_length;

                        // Only entire blocks can be hashed. Copy remainder to extra blocks buffer.
                        uint32_t copy_len = len & (ISAL_SHA256_BLOCK_SIZE - 1);

                        if (copy_len) {
                                len -= copy_len;
                                memcpy_varlen(ctx->partial_block_buffer,
                                              ((const char *) buffer + len), copy_len);
                                ctx->partial_block_buffer_length = copy_len;
                        }

                        ctx->incoming_buffer_length = 0;

                        // len should be a multiple of the block size now
                        assert((len % ISAL_SHA256_BLOCK_SIZE) == 0);

                        // Set len to the number of blocks to be hashed in the user's buffer
                        len >>= ISAL_SHA256_LOG2_BLOCK_SIZE;

                        if (len) {
                                ctx->job.buffer = (uint8_t *) buffer;
                                ctx->job.len = len;
                                ctx = (ISAL_SHA256_HASH_CTX *) _sha256_mb_mgr_submit_avx(&mgr->mgr,
                                                                                         &ctx->job);
                                continue;
                        }
                }
                // If the extra blocks are not empty, then we are either on the last block(s)
                // or we need more user input before continuing.
                if (ctx->status & ISAL_HASH_CTX_STS_LAST) {
                        uint8_t *buf = ctx->partial_block_buffer;
                        uint32_t n_extra_blocks = hash_pad(buf, ctx->total_length);

                        ctx->status = (ISAL_HASH_CTX_STS) (ISAL_HASH_CTX_STS_PROCESSING |
                                                           ISAL_HASH_CTX_STS_COMPLETE);
                        ctx->job.buffer = buf;
                        ctx->job.len = (uint32_t) n_extra_blocks;
                        ctx = (ISAL_SHA256_HASH_CTX *) _sha256_mb_mgr_submit_avx(&mgr->mgr,
                                                                                 &ctx->job);
                        continue;
                }

                if (ctx)
                        ctx->status = ISAL_HASH_CTX_STS_IDLE;
                return ctx;
        }

        return NULL;
}

static inline void
hash_init_digest(ISAL_SHA256_WORD_T *digest)
{
        static const ISAL_SHA256_WORD_T hash_initial_digest[ISAL_SHA256_DIGEST_NWORDS] = {
                ISAL_SHA256_INITIAL_DIGEST
        };
        memcpy_fixedlen(digest, hash_initial_digest, sizeof(hash_initial_digest));
}

static inline uint32_t
hash_pad(uint8_t padblock[ISAL_SHA256_BLOCK_SIZE * 2], uint64_t total_len)
{
        uint32_t i = (uint32_t) (total_len & (ISAL_SHA256_BLOCK_SIZE - 1));

        memclr_fixedlen(&padblock[i], ISAL_SHA256_BLOCK_SIZE);
        padblock[i] = 0x80;

        // Move i to the end of either 1st or 2nd extra block depending on length
        i += ((ISAL_SHA256_BLOCK_SIZE - 1) &
              (0 - (total_len + ISAL_SHA256_PADLENGTHFIELD_SIZE + 1))) +
             1 + ISAL_SHA256_PADLENGTHFIELD_SIZE;

#if ISAL_SHA256_PADLENGTHFIELD_SIZE == 16
        *((uint64_t *) &padblock[i - 16]) = 0;
#endif

        *((uint64_t *) &padblock[i - 8]) = to_be64((uint64_t) total_len << 3);

        return i >> ISAL_SHA256_LOG2_BLOCK_SIZE; // Number of extra blocks to hash
}

struct slver {
        uint16_t snum;
        uint8_t ver;
        uint8_t core;
};
struct slver _sha256_ctx_mgr_init_avx_slver_02020154;
struct slver _sha256_ctx_mgr_init_avx_slver = { 0x0154, 0x02, 0x02 };

struct slver _sha256_ctx_mgr_submit_avx_slver_02020155;
struct slver _sha256_ctx_mgr_submit_avx_slver = { 0x0155, 0x02, 0x02 };

struct slver _sha256_ctx_mgr_flush_avx_slver_02020156;
struct slver _sha256_ctx_mgr_flush_avx_slver = { 0x0156, 0x02, 0x02 };

#if defined(__clang__)
#pragma clang attribute pop
#endif