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678 lines
18 KiB
678 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* ChaCha20-Poly1305 AEAD, RFC7539 |
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* |
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* Copyright (C) 2015 Martin Willi |
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*/ |
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#include <crypto/internal/aead.h> |
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#include <crypto/internal/hash.h> |
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#include <crypto/internal/skcipher.h> |
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#include <crypto/scatterwalk.h> |
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#include <crypto/chacha.h> |
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#include <crypto/poly1305.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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struct chachapoly_instance_ctx { |
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struct crypto_skcipher_spawn chacha; |
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struct crypto_ahash_spawn poly; |
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unsigned int saltlen; |
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}; |
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struct chachapoly_ctx { |
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struct crypto_skcipher *chacha; |
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struct crypto_ahash *poly; |
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/* key bytes we use for the ChaCha20 IV */ |
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unsigned int saltlen; |
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u8 salt[]; |
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}; |
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struct poly_req { |
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/* zero byte padding for AD/ciphertext, as needed */ |
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u8 pad[POLY1305_BLOCK_SIZE]; |
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/* tail data with AD/ciphertext lengths */ |
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struct { |
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__le64 assoclen; |
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__le64 cryptlen; |
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} tail; |
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struct scatterlist src[1]; |
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struct ahash_request req; /* must be last member */ |
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}; |
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struct chacha_req { |
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u8 iv[CHACHA_IV_SIZE]; |
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struct scatterlist src[1]; |
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struct skcipher_request req; /* must be last member */ |
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}; |
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struct chachapoly_req_ctx { |
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struct scatterlist src[2]; |
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struct scatterlist dst[2]; |
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/* the key we generate for Poly1305 using Chacha20 */ |
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u8 key[POLY1305_KEY_SIZE]; |
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/* calculated Poly1305 tag */ |
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u8 tag[POLY1305_DIGEST_SIZE]; |
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/* length of data to en/decrypt, without ICV */ |
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unsigned int cryptlen; |
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/* Actual AD, excluding IV */ |
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unsigned int assoclen; |
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/* request flags, with MAY_SLEEP cleared if needed */ |
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u32 flags; |
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union { |
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struct poly_req poly; |
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struct chacha_req chacha; |
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} u; |
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}; |
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static inline void async_done_continue(struct aead_request *req, int err, |
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int (*cont)(struct aead_request *)) |
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{ |
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if (!err) { |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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rctx->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
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err = cont(req); |
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} |
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if (err != -EINPROGRESS && err != -EBUSY) |
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aead_request_complete(req, err); |
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} |
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static void chacha_iv(u8 *iv, struct aead_request *req, u32 icb) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
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__le32 leicb = cpu_to_le32(icb); |
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memcpy(iv, &leicb, sizeof(leicb)); |
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memcpy(iv + sizeof(leicb), ctx->salt, ctx->saltlen); |
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memcpy(iv + sizeof(leicb) + ctx->saltlen, req->iv, |
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CHACHA_IV_SIZE - sizeof(leicb) - ctx->saltlen); |
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} |
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static int poly_verify_tag(struct aead_request *req) |
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{ |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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u8 tag[sizeof(rctx->tag)]; |
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scatterwalk_map_and_copy(tag, req->src, |
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req->assoclen + rctx->cryptlen, |
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sizeof(tag), 0); |
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if (crypto_memneq(tag, rctx->tag, sizeof(tag))) |
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return -EBADMSG; |
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return 0; |
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} |
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static int poly_copy_tag(struct aead_request *req) |
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{ |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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scatterwalk_map_and_copy(rctx->tag, req->dst, |
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req->assoclen + rctx->cryptlen, |
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sizeof(rctx->tag), 1); |
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return 0; |
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} |
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static void chacha_decrypt_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_verify_tag); |
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} |
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static int chacha_decrypt(struct aead_request *req) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct chacha_req *creq = &rctx->u.chacha; |
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struct scatterlist *src, *dst; |
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int err; |
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if (rctx->cryptlen == 0) |
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goto skip; |
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chacha_iv(creq->iv, req, 1); |
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src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen); |
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dst = src; |
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if (req->src != req->dst) |
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dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); |
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skcipher_request_set_callback(&creq->req, rctx->flags, |
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chacha_decrypt_done, req); |
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skcipher_request_set_tfm(&creq->req, ctx->chacha); |
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skcipher_request_set_crypt(&creq->req, src, dst, |
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rctx->cryptlen, creq->iv); |
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err = crypto_skcipher_decrypt(&creq->req); |
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if (err) |
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return err; |
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skip: |
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return poly_verify_tag(req); |
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} |
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static int poly_tail_continue(struct aead_request *req) |
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{ |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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if (rctx->cryptlen == req->cryptlen) /* encrypting */ |
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return poly_copy_tag(req); |
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return chacha_decrypt(req); |
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} |
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static void poly_tail_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_tail_continue); |
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} |
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static int poly_tail(struct aead_request *req) |
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{ |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct poly_req *preq = &rctx->u.poly; |
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int err; |
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preq->tail.assoclen = cpu_to_le64(rctx->assoclen); |
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preq->tail.cryptlen = cpu_to_le64(rctx->cryptlen); |
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sg_init_one(preq->src, &preq->tail, sizeof(preq->tail)); |
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ahash_request_set_callback(&preq->req, rctx->flags, |
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poly_tail_done, req); |
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ahash_request_set_tfm(&preq->req, ctx->poly); |
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ahash_request_set_crypt(&preq->req, preq->src, |
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rctx->tag, sizeof(preq->tail)); |
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err = crypto_ahash_finup(&preq->req); |
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if (err) |
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return err; |
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return poly_tail_continue(req); |
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} |
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static void poly_cipherpad_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_tail); |
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} |
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static int poly_cipherpad(struct aead_request *req) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct poly_req *preq = &rctx->u.poly; |
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unsigned int padlen; |
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int err; |
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padlen = -rctx->cryptlen % POLY1305_BLOCK_SIZE; |
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memset(preq->pad, 0, sizeof(preq->pad)); |
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sg_init_one(preq->src, preq->pad, padlen); |
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ahash_request_set_callback(&preq->req, rctx->flags, |
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poly_cipherpad_done, req); |
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ahash_request_set_tfm(&preq->req, ctx->poly); |
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ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); |
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err = crypto_ahash_update(&preq->req); |
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if (err) |
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return err; |
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return poly_tail(req); |
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} |
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static void poly_cipher_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_cipherpad); |
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} |
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static int poly_cipher(struct aead_request *req) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct poly_req *preq = &rctx->u.poly; |
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struct scatterlist *crypt = req->src; |
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int err; |
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if (rctx->cryptlen == req->cryptlen) /* encrypting */ |
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crypt = req->dst; |
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crypt = scatterwalk_ffwd(rctx->src, crypt, req->assoclen); |
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ahash_request_set_callback(&preq->req, rctx->flags, |
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poly_cipher_done, req); |
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ahash_request_set_tfm(&preq->req, ctx->poly); |
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ahash_request_set_crypt(&preq->req, crypt, NULL, rctx->cryptlen); |
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err = crypto_ahash_update(&preq->req); |
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if (err) |
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return err; |
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return poly_cipherpad(req); |
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} |
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static void poly_adpad_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_cipher); |
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} |
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static int poly_adpad(struct aead_request *req) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct poly_req *preq = &rctx->u.poly; |
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unsigned int padlen; |
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int err; |
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padlen = -rctx->assoclen % POLY1305_BLOCK_SIZE; |
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memset(preq->pad, 0, sizeof(preq->pad)); |
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sg_init_one(preq->src, preq->pad, padlen); |
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ahash_request_set_callback(&preq->req, rctx->flags, |
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poly_adpad_done, req); |
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ahash_request_set_tfm(&preq->req, ctx->poly); |
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ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); |
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err = crypto_ahash_update(&preq->req); |
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if (err) |
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return err; |
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return poly_cipher(req); |
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} |
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static void poly_ad_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_adpad); |
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} |
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static int poly_ad(struct aead_request *req) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct poly_req *preq = &rctx->u.poly; |
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int err; |
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ahash_request_set_callback(&preq->req, rctx->flags, |
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poly_ad_done, req); |
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ahash_request_set_tfm(&preq->req, ctx->poly); |
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ahash_request_set_crypt(&preq->req, req->src, NULL, rctx->assoclen); |
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err = crypto_ahash_update(&preq->req); |
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if (err) |
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return err; |
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return poly_adpad(req); |
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} |
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static void poly_setkey_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_ad); |
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} |
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static int poly_setkey(struct aead_request *req) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct poly_req *preq = &rctx->u.poly; |
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int err; |
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sg_init_one(preq->src, rctx->key, sizeof(rctx->key)); |
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ahash_request_set_callback(&preq->req, rctx->flags, |
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poly_setkey_done, req); |
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ahash_request_set_tfm(&preq->req, ctx->poly); |
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ahash_request_set_crypt(&preq->req, preq->src, NULL, sizeof(rctx->key)); |
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err = crypto_ahash_update(&preq->req); |
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if (err) |
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return err; |
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return poly_ad(req); |
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} |
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static void poly_init_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_setkey); |
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} |
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static int poly_init(struct aead_request *req) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct poly_req *preq = &rctx->u.poly; |
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int err; |
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ahash_request_set_callback(&preq->req, rctx->flags, |
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poly_init_done, req); |
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ahash_request_set_tfm(&preq->req, ctx->poly); |
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err = crypto_ahash_init(&preq->req); |
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if (err) |
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return err; |
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return poly_setkey(req); |
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} |
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static void poly_genkey_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_init); |
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} |
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static int poly_genkey(struct aead_request *req) |
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{ |
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struct crypto_aead *tfm = crypto_aead_reqtfm(req); |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct chacha_req *creq = &rctx->u.chacha; |
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int err; |
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rctx->assoclen = req->assoclen; |
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if (crypto_aead_ivsize(tfm) == 8) { |
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if (rctx->assoclen < 8) |
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return -EINVAL; |
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rctx->assoclen -= 8; |
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} |
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memset(rctx->key, 0, sizeof(rctx->key)); |
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sg_init_one(creq->src, rctx->key, sizeof(rctx->key)); |
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chacha_iv(creq->iv, req, 0); |
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skcipher_request_set_callback(&creq->req, rctx->flags, |
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poly_genkey_done, req); |
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skcipher_request_set_tfm(&creq->req, ctx->chacha); |
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skcipher_request_set_crypt(&creq->req, creq->src, creq->src, |
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POLY1305_KEY_SIZE, creq->iv); |
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err = crypto_skcipher_decrypt(&creq->req); |
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if (err) |
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return err; |
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return poly_init(req); |
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} |
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static void chacha_encrypt_done(struct crypto_async_request *areq, int err) |
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{ |
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async_done_continue(areq->data, err, poly_genkey); |
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} |
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static int chacha_encrypt(struct aead_request *req) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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struct chacha_req *creq = &rctx->u.chacha; |
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struct scatterlist *src, *dst; |
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int err; |
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if (req->cryptlen == 0) |
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goto skip; |
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chacha_iv(creq->iv, req, 1); |
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src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen); |
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dst = src; |
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if (req->src != req->dst) |
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dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); |
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skcipher_request_set_callback(&creq->req, rctx->flags, |
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chacha_encrypt_done, req); |
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skcipher_request_set_tfm(&creq->req, ctx->chacha); |
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skcipher_request_set_crypt(&creq->req, src, dst, |
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req->cryptlen, creq->iv); |
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err = crypto_skcipher_encrypt(&creq->req); |
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if (err) |
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return err; |
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skip: |
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return poly_genkey(req); |
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} |
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static int chachapoly_encrypt(struct aead_request *req) |
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{ |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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rctx->cryptlen = req->cryptlen; |
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rctx->flags = aead_request_flags(req); |
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/* encrypt call chain: |
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* - chacha_encrypt/done() |
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* - poly_genkey/done() |
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* - poly_init/done() |
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* - poly_setkey/done() |
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* - poly_ad/done() |
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* - poly_adpad/done() |
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* - poly_cipher/done() |
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* - poly_cipherpad/done() |
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* - poly_tail/done/continue() |
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* - poly_copy_tag() |
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*/ |
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return chacha_encrypt(req); |
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} |
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static int chachapoly_decrypt(struct aead_request *req) |
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{ |
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struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
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rctx->cryptlen = req->cryptlen - POLY1305_DIGEST_SIZE; |
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rctx->flags = aead_request_flags(req); |
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/* decrypt call chain: |
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* - poly_genkey/done() |
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* - poly_init/done() |
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* - poly_setkey/done() |
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* - poly_ad/done() |
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* - poly_adpad/done() |
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* - poly_cipher/done() |
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* - poly_cipherpad/done() |
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* - poly_tail/done/continue() |
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* - chacha_decrypt/done() |
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* - poly_verify_tag() |
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*/ |
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return poly_genkey(req); |
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} |
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static int chachapoly_setkey(struct crypto_aead *aead, const u8 *key, |
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unsigned int keylen) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(aead); |
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if (keylen != ctx->saltlen + CHACHA_KEY_SIZE) |
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return -EINVAL; |
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keylen -= ctx->saltlen; |
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memcpy(ctx->salt, key + keylen, ctx->saltlen); |
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crypto_skcipher_clear_flags(ctx->chacha, CRYPTO_TFM_REQ_MASK); |
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crypto_skcipher_set_flags(ctx->chacha, crypto_aead_get_flags(aead) & |
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CRYPTO_TFM_REQ_MASK); |
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return crypto_skcipher_setkey(ctx->chacha, key, keylen); |
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} |
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static int chachapoly_setauthsize(struct crypto_aead *tfm, |
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unsigned int authsize) |
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{ |
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if (authsize != POLY1305_DIGEST_SIZE) |
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return -EINVAL; |
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return 0; |
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} |
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static int chachapoly_init(struct crypto_aead *tfm) |
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{ |
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struct aead_instance *inst = aead_alg_instance(tfm); |
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struct chachapoly_instance_ctx *ictx = aead_instance_ctx(inst); |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
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struct crypto_skcipher *chacha; |
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struct crypto_ahash *poly; |
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unsigned long align; |
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poly = crypto_spawn_ahash(&ictx->poly); |
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if (IS_ERR(poly)) |
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return PTR_ERR(poly); |
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chacha = crypto_spawn_skcipher(&ictx->chacha); |
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if (IS_ERR(chacha)) { |
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crypto_free_ahash(poly); |
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return PTR_ERR(chacha); |
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} |
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ctx->chacha = chacha; |
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ctx->poly = poly; |
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ctx->saltlen = ictx->saltlen; |
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align = crypto_aead_alignmask(tfm); |
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align &= ~(crypto_tfm_ctx_alignment() - 1); |
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crypto_aead_set_reqsize( |
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tfm, |
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align + offsetof(struct chachapoly_req_ctx, u) + |
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max(offsetof(struct chacha_req, req) + |
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sizeof(struct skcipher_request) + |
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crypto_skcipher_reqsize(chacha), |
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offsetof(struct poly_req, req) + |
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sizeof(struct ahash_request) + |
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crypto_ahash_reqsize(poly))); |
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return 0; |
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} |
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static void chachapoly_exit(struct crypto_aead *tfm) |
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{ |
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struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
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|
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crypto_free_ahash(ctx->poly); |
|
crypto_free_skcipher(ctx->chacha); |
|
} |
|
|
|
static void chachapoly_free(struct aead_instance *inst) |
|
{ |
|
struct chachapoly_instance_ctx *ctx = aead_instance_ctx(inst); |
|
|
|
crypto_drop_skcipher(&ctx->chacha); |
|
crypto_drop_ahash(&ctx->poly); |
|
kfree(inst); |
|
} |
|
|
|
static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, |
|
const char *name, unsigned int ivsize) |
|
{ |
|
u32 mask; |
|
struct aead_instance *inst; |
|
struct chachapoly_instance_ctx *ctx; |
|
struct skcipher_alg *chacha; |
|
struct hash_alg_common *poly; |
|
int err; |
|
|
|
if (ivsize > CHACHAPOLY_IV_SIZE) |
|
return -EINVAL; |
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); |
|
if (err) |
|
return err; |
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
|
if (!inst) |
|
return -ENOMEM; |
|
ctx = aead_instance_ctx(inst); |
|
ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize; |
|
|
|
err = crypto_grab_skcipher(&ctx->chacha, aead_crypto_instance(inst), |
|
crypto_attr_alg_name(tb[1]), 0, mask); |
|
if (err) |
|
goto err_free_inst; |
|
chacha = crypto_spawn_skcipher_alg(&ctx->chacha); |
|
|
|
err = crypto_grab_ahash(&ctx->poly, aead_crypto_instance(inst), |
|
crypto_attr_alg_name(tb[2]), 0, mask); |
|
if (err) |
|
goto err_free_inst; |
|
poly = crypto_spawn_ahash_alg(&ctx->poly); |
|
|
|
err = -EINVAL; |
|
if (poly->digestsize != POLY1305_DIGEST_SIZE) |
|
goto err_free_inst; |
|
/* Need 16-byte IV size, including Initial Block Counter value */ |
|
if (crypto_skcipher_alg_ivsize(chacha) != CHACHA_IV_SIZE) |
|
goto err_free_inst; |
|
/* Not a stream cipher? */ |
|
if (chacha->base.cra_blocksize != 1) |
|
goto err_free_inst; |
|
|
|
err = -ENAMETOOLONG; |
|
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
|
"%s(%s,%s)", name, chacha->base.cra_name, |
|
poly->base.cra_name) >= CRYPTO_MAX_ALG_NAME) |
|
goto err_free_inst; |
|
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
|
"%s(%s,%s)", name, chacha->base.cra_driver_name, |
|
poly->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
|
goto err_free_inst; |
|
|
|
inst->alg.base.cra_priority = (chacha->base.cra_priority + |
|
poly->base.cra_priority) / 2; |
|
inst->alg.base.cra_blocksize = 1; |
|
inst->alg.base.cra_alignmask = chacha->base.cra_alignmask | |
|
poly->base.cra_alignmask; |
|
inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) + |
|
ctx->saltlen; |
|
inst->alg.ivsize = ivsize; |
|
inst->alg.chunksize = crypto_skcipher_alg_chunksize(chacha); |
|
inst->alg.maxauthsize = POLY1305_DIGEST_SIZE; |
|
inst->alg.init = chachapoly_init; |
|
inst->alg.exit = chachapoly_exit; |
|
inst->alg.encrypt = chachapoly_encrypt; |
|
inst->alg.decrypt = chachapoly_decrypt; |
|
inst->alg.setkey = chachapoly_setkey; |
|
inst->alg.setauthsize = chachapoly_setauthsize; |
|
|
|
inst->free = chachapoly_free; |
|
|
|
err = aead_register_instance(tmpl, inst); |
|
if (err) { |
|
err_free_inst: |
|
chachapoly_free(inst); |
|
} |
|
return err; |
|
} |
|
|
|
static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb) |
|
{ |
|
return chachapoly_create(tmpl, tb, "rfc7539", 12); |
|
} |
|
|
|
static int rfc7539esp_create(struct crypto_template *tmpl, struct rtattr **tb) |
|
{ |
|
return chachapoly_create(tmpl, tb, "rfc7539esp", 8); |
|
} |
|
|
|
static struct crypto_template rfc7539_tmpls[] = { |
|
{ |
|
.name = "rfc7539", |
|
.create = rfc7539_create, |
|
.module = THIS_MODULE, |
|
}, { |
|
.name = "rfc7539esp", |
|
.create = rfc7539esp_create, |
|
.module = THIS_MODULE, |
|
}, |
|
}; |
|
|
|
static int __init chacha20poly1305_module_init(void) |
|
{ |
|
return crypto_register_templates(rfc7539_tmpls, |
|
ARRAY_SIZE(rfc7539_tmpls)); |
|
} |
|
|
|
static void __exit chacha20poly1305_module_exit(void) |
|
{ |
|
crypto_unregister_templates(rfc7539_tmpls, |
|
ARRAY_SIZE(rfc7539_tmpls)); |
|
} |
|
|
|
subsys_initcall(chacha20poly1305_module_init); |
|
module_exit(chacha20poly1305_module_exit); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Martin Willi <[email protected]>"); |
|
MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD"); |
|
MODULE_ALIAS_CRYPTO("rfc7539"); |
|
MODULE_ALIAS_CRYPTO("rfc7539esp");
|
|
|