sha512_glue.c

Go to the documentation of this file.

/* Glue code for SHA512 hashing optimized for sparc64 crypto opcodes.
 *
 * This is based largely upon crypto/sha512_generic.c
 *
 * Copyright (c) Jean-Luc Cooke <[email protected]>
 * Copyright (c) Andrew McDonald <[email protected]>
 * Copyright (c) 2003 Kyle McMartin <[email protected]>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <crypto/internal/hash.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <crypto/sha.h>

#include <asm/pstate.h>
#include <asm/elf.h>

#include "opcodes.h"

asmlinkage void sha512_sparc64_transform(u64 *digest, const char *data,
                     unsigned int rounds);

static int sha512_sparc64_init(struct shash_desc *desc)
{
    struct sha512_state *sctx = shash_desc_ctx(desc);
    sctx->state[0] = SHA512_H0;
    sctx->state[1] = SHA512_H1;
    sctx->state[2] = SHA512_H2;
    sctx->state[3] = SHA512_H3;
    sctx->state[4] = SHA512_H4;
    sctx->state[5] = SHA512_H5;
    sctx->state[6] = SHA512_H6;
    sctx->state[7] = SHA512_H7;
    sctx->count[0] = sctx->count[1] = 0;

    return 0;
}

static int sha384_sparc64_init(struct shash_desc *desc)
{
    struct sha512_state *sctx = shash_desc_ctx(desc);
    sctx->state[0] = SHA384_H0;
    sctx->state[1] = SHA384_H1;
    sctx->state[2] = SHA384_H2;
    sctx->state[3] = SHA384_H3;
    sctx->state[4] = SHA384_H4;
    sctx->state[5] = SHA384_H5;
    sctx->state[6] = SHA384_H6;
    sctx->state[7] = SHA384_H7;
    sctx->count[0] = sctx->count[1] = 0;

    return 0;
}

static void __sha512_sparc64_update(struct sha512_state *sctx, const u8 *data,
                    unsigned int len, unsigned int partial)
{
    unsigned int done = 0;

    if ((sctx->count[0] += len) < len)
        sctx->count[1]++;
    if (partial) {
        done = SHA512_BLOCK_SIZE - partial;
        memcpy(sctx->buf + partial, data, done);
        sha512_sparc64_transform(sctx->state, sctx->buf, 1);
    }
    if (len - done >= SHA512_BLOCK_SIZE) {
        const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;

        sha512_sparc64_transform(sctx->state, data + done, rounds);
        done += rounds * SHA512_BLOCK_SIZE;
    }

    memcpy(sctx->buf, data + done, len - done);
}

static int sha512_sparc64_update(struct shash_desc *desc, const u8 *data,
                 unsigned int len)
{
    struct sha512_state *sctx = shash_desc_ctx(desc);
    unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;

    /* Handle the fast case right here */
    if (partial + len < SHA512_BLOCK_SIZE) {
        if ((sctx->count[0] += len) < len)
            sctx->count[1]++;
        memcpy(sctx->buf + partial, data, len);
    } else
        __sha512_sparc64_update(sctx, data, len, partial);

    return 0;
}

static int sha512_sparc64_final(struct shash_desc *desc, u8 *out)
{
    struct sha512_state *sctx = shash_desc_ctx(desc);
    unsigned int i, index, padlen;
    __be64 *dst = (__be64 *)out;
    __be64 bits[2];
    static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };

    /* Save number of bits */
    bits[1] = cpu_to_be64(sctx->count[0] << 3);
    bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);

    /* Pad out to 112 mod 128 and append length */
    index = sctx->count[0] % SHA512_BLOCK_SIZE;
    padlen = (index < 112) ? (112 - index) : ((SHA512_BLOCK_SIZE+112) - index);

    /* We need to fill a whole block for __sha512_sparc64_update() */
    if (padlen <= 112) {
        if ((sctx->count[0] += padlen) < padlen)
            sctx->count[1]++;
        memcpy(sctx->buf + index, padding, padlen);
    } else {
        __sha512_sparc64_update(sctx, padding, padlen, index);
    }
    __sha512_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 112);

    /* Store state in digest */
    for (i = 0; i < 8; i++)
        dst[i] = cpu_to_be64(sctx->state[i]);

    /* Wipe context */
    memset(sctx, 0, sizeof(*sctx));

    return 0;
}

static int sha384_sparc64_final(struct shash_desc *desc, u8 *hash)
{
    u8 D[64];

    sha512_sparc64_final(desc, D);

    memcpy(hash, D, 48);
    memset(D, 0, 64);

    return 0;
}

static struct shash_alg sha512 = {
    .digestsize =   SHA512_DIGEST_SIZE,
    .init       =   sha512_sparc64_init,
    .update     =   sha512_sparc64_update,
    .final      =   sha512_sparc64_final,
    .descsize   =   sizeof(struct sha512_state),
    .base       =   {
        .cra_name   =   "sha512",
        .cra_driver_name=   "sha512-sparc64",
        .cra_priority   =   SPARC_CR_OPCODE_PRIORITY,
        .cra_flags  =   CRYPTO_ALG_TYPE_SHASH,
        .cra_blocksize  =   SHA512_BLOCK_SIZE,
        .cra_module =   THIS_MODULE,
    }
};

static struct shash_alg sha384 = {
    .digestsize =   SHA384_DIGEST_SIZE,
    .init       =   sha384_sparc64_init,
    .update     =   sha512_sparc64_update,
    .final      =   sha384_sparc64_final,
    .descsize   =   sizeof(struct sha512_state),
    .base       =   {
        .cra_name   =   "sha384",
        .cra_driver_name=   "sha384-sparc64",
        .cra_priority   =   SPARC_CR_OPCODE_PRIORITY,
        .cra_flags  =   CRYPTO_ALG_TYPE_SHASH,
        .cra_blocksize  =   SHA384_BLOCK_SIZE,
        .cra_module =   THIS_MODULE,
    }
};

static bool __init sparc64_has_sha512_opcode(void)
{
    unsigned long cfr;

    if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
        return false;

    __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
    if (!(cfr & CFR_SHA512))
        return false;

    return true;
}

static int __init sha512_sparc64_mod_init(void)
{
    if (sparc64_has_sha512_opcode()) {
        int ret = crypto_register_shash(&sha384);
        if (ret < 0)
            return ret;

        ret = crypto_register_shash(&sha512);
        if (ret < 0) {
            crypto_unregister_shash(&sha384);
            return ret;
        }

        pr_info("Using sparc64 sha512 opcode optimized SHA-512/SHA-384 implementation\n");
        return 0;
    }
    pr_info("sparc64 sha512 opcode not available.\n");
    return -ENODEV;
}

static void __exit sha512_sparc64_mod_fini(void)
{
    crypto_unregister_shash(&sha384);
    crypto_unregister_shash(&sha512);
}

module_init(sha512_sparc64_mod_init);
module_exit(sha512_sparc64_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SHA-384 and SHA-512 Secure Hash Algorithm, sparc64 sha512 opcode accelerated");

MODULE_ALIAS("sha384");
MODULE_ALIAS("sha512");

#include "crop_devid.c"