linux/crypto/cts.c

65 static inline u8 *crypto_cts_reqctx_space(struct skcipher_request *req)
67 	struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
68 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
90 	struct skcipher_request *req = data;
95 	skcipher_request_complete(req, err);
98 static int cts_cbc_encrypt(struct skcipher_request *req)
100 	struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
101 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
110 	lastn = req->cryptlen - offset;
112 	sg = scatterwalk_ffwd(rctx->sg, req->dst, offset - bsize);
116 	scatterwalk_map_and_copy(d, req->src, offset, lastn, 0);
121 	skcipher_request_set_callback(subreq, req->base.flags &
123 				      cts_cbc_crypt_done, req);
124 	skcipher_request_set_crypt(subreq, sg, sg, bsize, req->iv);
130 	struct skcipher_request *req = data;
135 	err = cts_cbc_encrypt(req);
140 	skcipher_request_complete(req, err);
143 static int crypto_cts_encrypt(struct skcipher_request *req)
145 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
146 	struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
150 	unsigned int nbytes = req->cryptlen;
159 		skcipher_request_set_callback(subreq, req->base.flags,
160 					      req->base.complete,
161 					      req->base.data);
162 		skcipher_request_set_crypt(subreq, req->src, req->dst, nbytes,
163 					   req->iv);
170 	skcipher_request_set_callback(subreq, req->base.flags,
171 				      crypto_cts_encrypt_done, req);
172 	skcipher_request_set_crypt(subreq, req->src, req->dst,
173 				   offset, req->iv);
176 	       cts_cbc_encrypt(req);
179 static int cts_cbc_decrypt(struct skcipher_request *req)
181 	struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
182 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
192 	lastn = req->cryptlen - offset;
194 	sg = scatterwalk_ffwd(rctx->sg, req->dst, offset - bsize);
198 	space = crypto_cts_reqctx_space(req);
202 	scatterwalk_map_and_copy(d, req->src, offset, lastn, 0);
214 	skcipher_request_set_callback(subreq, req->base.flags &
216 				      cts_cbc_crypt_done, req);
224 	struct skcipher_request *req = data;
229 	err = cts_cbc_decrypt(req);
234 	skcipher_request_complete(req, err);
237 static int crypto_cts_decrypt(struct skcipher_request *req)
239 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
240 	struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
244 	unsigned int nbytes = req->cryptlen;
254 		skcipher_request_set_callback(subreq, req->base.flags,
255 					      req->base.complete,
256 					      req->base.data);
257 		skcipher_request_set_crypt(subreq, req->src, req->dst, nbytes,
258 					   req->iv);
262 	skcipher_request_set_callback(subreq, req->base.flags,
263 				      crypto_cts_decrypt_done, req);
265 	space = crypto_cts_reqctx_space(req);
271 		memcpy(space, req->iv, bsize);
273 		scatterwalk_map_and_copy(space, req->src, offset - 2 * bsize,
276 	skcipher_request_set_crypt(subreq, req->src, req->dst,
277 				   offset, req->iv);
280 	       cts_cbc_decrypt(req);