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![Gary R Hook](/assets/img/avatar_default.png)
A version 5 CCP can handle an RSA modulus up to 16k bits. Signed-off-by: Gary R Hook <gary.hook@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
299 lines
6.9 KiB
C
299 lines
6.9 KiB
C
/*
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* AMD Cryptographic Coprocessor (CCP) RSA crypto API support
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*
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* Copyright (C) 2017 Advanced Micro Devices, Inc.
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*
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* Author: Gary R Hook <gary.hook@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/scatterlist.h>
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#include <linux/crypto.h>
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#include <crypto/algapi.h>
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#include <crypto/internal/rsa.h>
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#include <crypto/internal/akcipher.h>
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#include <crypto/akcipher.h>
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#include <crypto/scatterwalk.h>
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#include "ccp-crypto.h"
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static inline struct akcipher_request *akcipher_request_cast(
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struct crypto_async_request *req)
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{
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return container_of(req, struct akcipher_request, base);
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}
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static inline int ccp_copy_and_save_keypart(u8 **kpbuf, unsigned int *kplen,
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const u8 *buf, size_t sz)
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{
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int nskip;
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for (nskip = 0; nskip < sz; nskip++)
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if (buf[nskip])
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break;
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*kplen = sz - nskip;
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*kpbuf = kzalloc(*kplen, GFP_KERNEL);
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if (!*kpbuf)
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return -ENOMEM;
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memcpy(*kpbuf, buf + nskip, *kplen);
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return 0;
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}
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static int ccp_rsa_complete(struct crypto_async_request *async_req, int ret)
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{
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struct akcipher_request *req = akcipher_request_cast(async_req);
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struct ccp_rsa_req_ctx *rctx = akcipher_request_ctx(req);
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if (ret)
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return ret;
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req->dst_len = rctx->cmd.u.rsa.key_size >> 3;
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return 0;
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}
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static unsigned int ccp_rsa_maxsize(struct crypto_akcipher *tfm)
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{
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if (ccp_version() > CCP_VERSION(3, 0))
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return CCP5_RSA_MAXMOD;
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else
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return CCP_RSA_MAXMOD;
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}
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static int ccp_rsa_crypt(struct akcipher_request *req, bool encrypt)
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{
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struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
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struct ccp_ctx *ctx = akcipher_tfm_ctx(tfm);
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struct ccp_rsa_req_ctx *rctx = akcipher_request_ctx(req);
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int ret = 0;
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memset(&rctx->cmd, 0, sizeof(rctx->cmd));
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INIT_LIST_HEAD(&rctx->cmd.entry);
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rctx->cmd.engine = CCP_ENGINE_RSA;
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rctx->cmd.u.rsa.key_size = ctx->u.rsa.key_len; /* in bits */
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if (encrypt) {
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rctx->cmd.u.rsa.exp = &ctx->u.rsa.e_sg;
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rctx->cmd.u.rsa.exp_len = ctx->u.rsa.e_len;
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} else {
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rctx->cmd.u.rsa.exp = &ctx->u.rsa.d_sg;
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rctx->cmd.u.rsa.exp_len = ctx->u.rsa.d_len;
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}
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rctx->cmd.u.rsa.mod = &ctx->u.rsa.n_sg;
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rctx->cmd.u.rsa.mod_len = ctx->u.rsa.n_len;
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rctx->cmd.u.rsa.src = req->src;
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rctx->cmd.u.rsa.src_len = req->src_len;
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rctx->cmd.u.rsa.dst = req->dst;
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ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
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return ret;
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}
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static int ccp_rsa_encrypt(struct akcipher_request *req)
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{
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return ccp_rsa_crypt(req, true);
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}
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static int ccp_rsa_decrypt(struct akcipher_request *req)
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{
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return ccp_rsa_crypt(req, false);
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}
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static int ccp_check_key_length(unsigned int len)
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{
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/* In bits */
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if (len < 8 || len > 4096)
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return -EINVAL;
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return 0;
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}
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static void ccp_rsa_free_key_bufs(struct ccp_ctx *ctx)
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{
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/* Clean up old key data */
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kzfree(ctx->u.rsa.e_buf);
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ctx->u.rsa.e_buf = NULL;
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ctx->u.rsa.e_len = 0;
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kzfree(ctx->u.rsa.n_buf);
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ctx->u.rsa.n_buf = NULL;
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ctx->u.rsa.n_len = 0;
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kzfree(ctx->u.rsa.d_buf);
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ctx->u.rsa.d_buf = NULL;
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ctx->u.rsa.d_len = 0;
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}
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static int ccp_rsa_setkey(struct crypto_akcipher *tfm, const void *key,
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unsigned int keylen, bool private)
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{
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struct ccp_ctx *ctx = akcipher_tfm_ctx(tfm);
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struct rsa_key raw_key;
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int ret;
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ccp_rsa_free_key_bufs(ctx);
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memset(&raw_key, 0, sizeof(raw_key));
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/* Code borrowed from crypto/rsa.c */
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if (private)
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ret = rsa_parse_priv_key(&raw_key, key, keylen);
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else
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ret = rsa_parse_pub_key(&raw_key, key, keylen);
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if (ret)
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goto n_key;
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ret = ccp_copy_and_save_keypart(&ctx->u.rsa.n_buf, &ctx->u.rsa.n_len,
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raw_key.n, raw_key.n_sz);
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if (ret)
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goto key_err;
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sg_init_one(&ctx->u.rsa.n_sg, ctx->u.rsa.n_buf, ctx->u.rsa.n_len);
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ctx->u.rsa.key_len = ctx->u.rsa.n_len << 3; /* convert to bits */
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if (ccp_check_key_length(ctx->u.rsa.key_len)) {
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ret = -EINVAL;
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goto key_err;
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}
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ret = ccp_copy_and_save_keypart(&ctx->u.rsa.e_buf, &ctx->u.rsa.e_len,
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raw_key.e, raw_key.e_sz);
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if (ret)
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goto key_err;
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sg_init_one(&ctx->u.rsa.e_sg, ctx->u.rsa.e_buf, ctx->u.rsa.e_len);
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if (private) {
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ret = ccp_copy_and_save_keypart(&ctx->u.rsa.d_buf,
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&ctx->u.rsa.d_len,
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raw_key.d, raw_key.d_sz);
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if (ret)
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goto key_err;
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sg_init_one(&ctx->u.rsa.d_sg,
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ctx->u.rsa.d_buf, ctx->u.rsa.d_len);
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}
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return 0;
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key_err:
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ccp_rsa_free_key_bufs(ctx);
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n_key:
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return ret;
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}
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static int ccp_rsa_setprivkey(struct crypto_akcipher *tfm, const void *key,
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unsigned int keylen)
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{
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return ccp_rsa_setkey(tfm, key, keylen, true);
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}
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static int ccp_rsa_setpubkey(struct crypto_akcipher *tfm, const void *key,
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unsigned int keylen)
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{
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return ccp_rsa_setkey(tfm, key, keylen, false);
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}
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static int ccp_rsa_init_tfm(struct crypto_akcipher *tfm)
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{
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struct ccp_ctx *ctx = akcipher_tfm_ctx(tfm);
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akcipher_set_reqsize(tfm, sizeof(struct ccp_rsa_req_ctx));
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ctx->complete = ccp_rsa_complete;
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return 0;
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}
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static void ccp_rsa_exit_tfm(struct crypto_akcipher *tfm)
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{
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struct ccp_ctx *ctx = crypto_tfm_ctx(&tfm->base);
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ccp_rsa_free_key_bufs(ctx);
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}
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static struct akcipher_alg ccp_rsa_defaults = {
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.encrypt = ccp_rsa_encrypt,
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.decrypt = ccp_rsa_decrypt,
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.sign = ccp_rsa_decrypt,
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.verify = ccp_rsa_encrypt,
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.set_pub_key = ccp_rsa_setpubkey,
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.set_priv_key = ccp_rsa_setprivkey,
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.max_size = ccp_rsa_maxsize,
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.init = ccp_rsa_init_tfm,
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.exit = ccp_rsa_exit_tfm,
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.base = {
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.cra_name = "rsa",
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.cra_driver_name = "rsa-ccp",
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.cra_priority = CCP_CRA_PRIORITY,
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.cra_module = THIS_MODULE,
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.cra_ctxsize = 2 * sizeof(struct ccp_ctx),
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},
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};
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struct ccp_rsa_def {
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unsigned int version;
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const char *name;
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const char *driver_name;
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unsigned int reqsize;
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struct akcipher_alg *alg_defaults;
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};
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static struct ccp_rsa_def rsa_algs[] = {
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{
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.version = CCP_VERSION(3, 0),
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.name = "rsa",
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.driver_name = "rsa-ccp",
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.reqsize = sizeof(struct ccp_rsa_req_ctx),
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.alg_defaults = &ccp_rsa_defaults,
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}
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};
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int ccp_register_rsa_alg(struct list_head *head, const struct ccp_rsa_def *def)
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{
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struct ccp_crypto_akcipher_alg *ccp_alg;
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struct akcipher_alg *alg;
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int ret;
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ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
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if (!ccp_alg)
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return -ENOMEM;
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INIT_LIST_HEAD(&ccp_alg->entry);
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alg = &ccp_alg->alg;
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*alg = *def->alg_defaults;
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snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
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snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
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def->driver_name);
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ret = crypto_register_akcipher(alg);
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if (ret) {
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pr_err("%s akcipher algorithm registration error (%d)\n",
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alg->base.cra_name, ret);
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kfree(ccp_alg);
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return ret;
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}
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list_add(&ccp_alg->entry, head);
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return 0;
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}
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int ccp_register_rsa_algs(struct list_head *head)
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{
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int i, ret;
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unsigned int ccpversion = ccp_version();
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/* Register the RSA algorithm in standard mode
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* This works for CCP v3 and later
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*/
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for (i = 0; i < ARRAY_SIZE(rsa_algs); i++) {
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if (rsa_algs[i].version > ccpversion)
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continue;
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ret = ccp_register_rsa_alg(head, &rsa_algs[i]);
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if (ret)
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return ret;
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}
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return 0;
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}
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