1 // SPDX-License-Identifier: GPL-2.0-only
3  * AMD Cryptographic Coprocessor (CCP) RSA crypto API support
13 #include <linux/crypto.h>
14 #include <crypto/algapi.h>
15 #include <crypto/internal/rsa.h>
16 #include <crypto/internal/akcipher.h>
17 #include <crypto/akcipher.h>
18 #include <crypto/scatterwalk.h>
20 #include "ccp-crypto.h"
22 static inline struct akcipher_request *akcipher_request_cast(  in akcipher_request_cast()
28 static inline int ccp_copy_and_save_keypart(u8 **kpbuf, unsigned int *kplen,  in ccp_copy_and_save_keypart()
36 	*kplen = sz - nskip;  in ccp_copy_and_save_keypart()
39 		return -ENOMEM;  in ccp_copy_and_save_keypart()
52 	req->dst_len = rctx->cmd.u.rsa.key_size >> 3;  in ccp_rsa_complete()
61 	return ctx->u.rsa.n_len;  in ccp_rsa_maxsize()
71 	memset(&rctx->cmd, 0, sizeof(rctx->cmd));  in ccp_rsa_crypt()
72 	INIT_LIST_HEAD(&rctx->cmd.entry);  in ccp_rsa_crypt()
73 	rctx->cmd.engine = CCP_ENGINE_RSA;  in ccp_rsa_crypt()
75 	rctx->cmd.u.rsa.key_size = ctx->u.rsa.key_len; /* in bits */  in ccp_rsa_crypt()
77 		rctx->cmd.u.rsa.exp = &ctx->u.rsa.e_sg;  in ccp_rsa_crypt()
78 		rctx->cmd.u.rsa.exp_len = ctx->u.rsa.e_len;  in ccp_rsa_crypt()
80 		rctx->cmd.u.rsa.exp = &ctx->u.rsa.d_sg;  in ccp_rsa_crypt()
81 		rctx->cmd.u.rsa.exp_len = ctx->u.rsa.d_len;  in ccp_rsa_crypt()
83 	rctx->cmd.u.rsa.mod = &ctx->u.rsa.n_sg;  in ccp_rsa_crypt()
84 	rctx->cmd.u.rsa.mod_len = ctx->u.rsa.n_len;  in ccp_rsa_crypt()
85 	rctx->cmd.u.rsa.src = req->src;  in ccp_rsa_crypt()
86 	rctx->cmd.u.rsa.src_len = req->src_len;  in ccp_rsa_crypt()
87 	rctx->cmd.u.rsa.dst = req->dst;  in ccp_rsa_crypt()
89 	ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);  in ccp_rsa_crypt()
108 		return -EINVAL;  in ccp_check_key_length()
115 	kfree_sensitive(ctx->u.rsa.e_buf);  in ccp_rsa_free_key_bufs()
116 	ctx->u.rsa.e_buf = NULL;  in ccp_rsa_free_key_bufs()
117 	ctx->u.rsa.e_len = 0;  in ccp_rsa_free_key_bufs()
118 	kfree_sensitive(ctx->u.rsa.n_buf);  in ccp_rsa_free_key_bufs()
119 	ctx->u.rsa.n_buf = NULL;  in ccp_rsa_free_key_bufs()
120 	ctx->u.rsa.n_len = 0;  in ccp_rsa_free_key_bufs()
121 	kfree_sensitive(ctx->u.rsa.d_buf);  in ccp_rsa_free_key_bufs()
122 	ctx->u.rsa.d_buf = NULL;  in ccp_rsa_free_key_bufs()
123 	ctx->u.rsa.d_len = 0;  in ccp_rsa_free_key_bufs()
136 	/* Code borrowed from crypto/rsa.c */  in ccp_rsa_setkey()
144 	ret = ccp_copy_and_save_keypart(&ctx->u.rsa.n_buf, &ctx->u.rsa.n_len,  in ccp_rsa_setkey()
148 	sg_init_one(&ctx->u.rsa.n_sg, ctx->u.rsa.n_buf, ctx->u.rsa.n_len);  in ccp_rsa_setkey()
150 	ctx->u.rsa.key_len = ctx->u.rsa.n_len << 3; /* convert to bits */  in ccp_rsa_setkey()
151 	if (ccp_check_key_length(ctx->u.rsa.key_len)) {  in ccp_rsa_setkey()
152 		ret = -EINVAL;  in ccp_rsa_setkey()
156 	ret = ccp_copy_and_save_keypart(&ctx->u.rsa.e_buf, &ctx->u.rsa.e_len,  in ccp_rsa_setkey()
160 	sg_init_one(&ctx->u.rsa.e_sg, ctx->u.rsa.e_buf, ctx->u.rsa.e_len);  in ccp_rsa_setkey()
163 		ret = ccp_copy_and_save_keypart(&ctx->u.rsa.d_buf,  in ccp_rsa_setkey()
164 						&ctx->u.rsa.d_len,  in ccp_rsa_setkey()
168 		sg_init_one(&ctx->u.rsa.d_sg,  in ccp_rsa_setkey()
169 			    ctx->u.rsa.d_buf, ctx->u.rsa.d_len);  in ccp_rsa_setkey()
198 	ctx->complete = ccp_rsa_complete;  in ccp_rsa_init_tfm()
220 		.cra_driver_name = "rsa-ccp",
239 		.driver_name	= "rsa-ccp",
254 		return -ENOMEM;  in ccp_register_rsa_alg()
256 	INIT_LIST_HEAD(&ccp_alg->entry);  in ccp_register_rsa_alg()
258 	alg = &ccp_alg->alg;  in ccp_register_rsa_alg()
259 	*alg = *def->alg_defaults;  in ccp_register_rsa_alg()
260 	snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);  in ccp_register_rsa_alg()
261 	snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",  in ccp_register_rsa_alg()
262 		 def->driver_name);  in ccp_register_rsa_alg()
266 		       alg->base.cra_name, ret);  in ccp_register_rsa_alg()
271 	list_add(&ccp_alg->entry, head);  in ccp_register_rsa_alg()