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154 lines
3.1 KiB
154 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Cryptographic API. |
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* |
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* s390 implementation of the GHASH algorithm for GCM (Galois/Counter Mode). |
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* |
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* Copyright IBM Corp. 2011 |
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* Author(s): Gerald Schaefer <[email protected]> |
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*/ |
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#include <crypto/internal/hash.h> |
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#include <linux/module.h> |
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#include <linux/cpufeature.h> |
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#include <asm/cpacf.h> |
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#define GHASH_BLOCK_SIZE 16 |
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#define GHASH_DIGEST_SIZE 16 |
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struct ghash_ctx { |
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u8 key[GHASH_BLOCK_SIZE]; |
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}; |
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struct ghash_desc_ctx { |
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u8 icv[GHASH_BLOCK_SIZE]; |
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u8 key[GHASH_BLOCK_SIZE]; |
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u8 buffer[GHASH_BLOCK_SIZE]; |
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u32 bytes; |
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}; |
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static int ghash_init(struct shash_desc *desc) |
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{ |
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struct ghash_desc_ctx *dctx = shash_desc_ctx(desc); |
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struct ghash_ctx *ctx = crypto_shash_ctx(desc->tfm); |
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memset(dctx, 0, sizeof(*dctx)); |
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memcpy(dctx->key, ctx->key, GHASH_BLOCK_SIZE); |
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return 0; |
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} |
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static int ghash_setkey(struct crypto_shash *tfm, |
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const u8 *key, unsigned int keylen) |
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{ |
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struct ghash_ctx *ctx = crypto_shash_ctx(tfm); |
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if (keylen != GHASH_BLOCK_SIZE) |
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return -EINVAL; |
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memcpy(ctx->key, key, GHASH_BLOCK_SIZE); |
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return 0; |
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} |
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static int ghash_update(struct shash_desc *desc, |
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const u8 *src, unsigned int srclen) |
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{ |
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struct ghash_desc_ctx *dctx = shash_desc_ctx(desc); |
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unsigned int n; |
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u8 *buf = dctx->buffer; |
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if (dctx->bytes) { |
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u8 *pos = buf + (GHASH_BLOCK_SIZE - dctx->bytes); |
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n = min(srclen, dctx->bytes); |
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dctx->bytes -= n; |
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srclen -= n; |
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memcpy(pos, src, n); |
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src += n; |
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if (!dctx->bytes) { |
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cpacf_kimd(CPACF_KIMD_GHASH, dctx, buf, |
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GHASH_BLOCK_SIZE); |
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} |
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} |
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n = srclen & ~(GHASH_BLOCK_SIZE - 1); |
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if (n) { |
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cpacf_kimd(CPACF_KIMD_GHASH, dctx, src, n); |
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src += n; |
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srclen -= n; |
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} |
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if (srclen) { |
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dctx->bytes = GHASH_BLOCK_SIZE - srclen; |
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memcpy(buf, src, srclen); |
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} |
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return 0; |
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} |
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static int ghash_flush(struct ghash_desc_ctx *dctx) |
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{ |
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u8 *buf = dctx->buffer; |
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if (dctx->bytes) { |
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u8 *pos = buf + (GHASH_BLOCK_SIZE - dctx->bytes); |
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memset(pos, 0, dctx->bytes); |
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cpacf_kimd(CPACF_KIMD_GHASH, dctx, buf, GHASH_BLOCK_SIZE); |
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dctx->bytes = 0; |
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} |
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return 0; |
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} |
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static int ghash_final(struct shash_desc *desc, u8 *dst) |
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{ |
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struct ghash_desc_ctx *dctx = shash_desc_ctx(desc); |
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int ret; |
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ret = ghash_flush(dctx); |
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if (!ret) |
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memcpy(dst, dctx->icv, GHASH_BLOCK_SIZE); |
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return ret; |
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} |
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static struct shash_alg ghash_alg = { |
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.digestsize = GHASH_DIGEST_SIZE, |
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.init = ghash_init, |
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.update = ghash_update, |
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.final = ghash_final, |
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.setkey = ghash_setkey, |
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.descsize = sizeof(struct ghash_desc_ctx), |
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.base = { |
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.cra_name = "ghash", |
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.cra_driver_name = "ghash-s390", |
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.cra_priority = 300, |
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.cra_blocksize = GHASH_BLOCK_SIZE, |
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.cra_ctxsize = sizeof(struct ghash_ctx), |
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.cra_module = THIS_MODULE, |
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}, |
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}; |
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static int __init ghash_mod_init(void) |
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{ |
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if (!cpacf_query_func(CPACF_KIMD, CPACF_KIMD_GHASH)) |
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return -ENODEV; |
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return crypto_register_shash(&ghash_alg); |
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} |
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static void __exit ghash_mod_exit(void) |
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{ |
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crypto_unregister_shash(&ghash_alg); |
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} |
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module_cpu_feature_match(MSA, ghash_mod_init); |
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module_exit(ghash_mod_exit); |
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MODULE_ALIAS_CRYPTO("ghash"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("GHASH hash function, s390 implementation");
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