crypto: chacha20poly1305 - Convert to new AEAD interface
This patch converts rfc7539 and rfc7539esp to the new AEAD interface. The test vectors for rfc7539esp have also been updated to include the IV. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Tested-by: Martin Willi <martin@strongswan.org>
This commit is contained in:
Herbert Xu
parent
6e8ec66c3d
commit
7479092233
2 changed files with 132 additions and 89 deletions
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@ -60,12 +60,16 @@ struct chacha_req {
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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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union {
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struct poly_req poly;
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struct chacha_req chacha;
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@ -98,7 +102,9 @@ static int poly_verify_tag(struct aead_request *req)
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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, rctx->cryptlen, sizeof(tag), 0);
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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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@ -108,7 +114,8 @@ 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, rctx->cryptlen,
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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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@ -123,14 +130,24 @@ static int chacha_decrypt(struct aead_request *req)
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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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chacha_iv(creq->iv, req, 1);
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sg_init_table(rctx->src, 2);
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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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sg_init_table(rctx->dst, 2);
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dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);
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}
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ablkcipher_request_set_callback(&creq->req, aead_request_flags(req),
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chacha_decrypt_done, req);
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ablkcipher_request_set_tfm(&creq->req, ctx->chacha);
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ablkcipher_request_set_crypt(&creq->req, req->src, req->dst,
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ablkcipher_request_set_crypt(&creq->req, src, dst,
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rctx->cryptlen, creq->iv);
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err = crypto_ablkcipher_decrypt(&creq->req);
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if (err)
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@ -156,14 +173,15 @@ static void poly_tail_done(struct crypto_async_request *areq, int err)
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static int poly_tail(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 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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__le64 len;
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int err;
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sg_init_table(preq->src, 1);
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len = cpu_to_le64(req->assoclen);
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len = cpu_to_le64(rctx->assoclen);
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memcpy(&preq->tail.assoclen, &len, sizeof(len));
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len = cpu_to_le64(rctx->cryptlen);
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memcpy(&preq->tail.cryptlen, &len, sizeof(len));
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@ -228,6 +246,9 @@ static int poly_cipher(struct aead_request *req)
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if (rctx->cryptlen == req->cryptlen) /* encrypting */
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crypt = req->dst;
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sg_init_table(rctx->src, 2);
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crypt = scatterwalk_ffwd(rctx->src, crypt, req->assoclen);
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ahash_request_set_callback(&preq->req, aead_request_flags(req),
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poly_cipher_done, req);
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ahash_request_set_tfm(&preq->req, ctx->poly);
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@ -253,7 +274,7 @@ static int poly_adpad(struct aead_request *req)
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unsigned int padlen, bs = POLY1305_BLOCK_SIZE;
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int err;
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padlen = (bs - (req->assoclen % bs)) % bs;
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padlen = (bs - (rctx->assoclen % bs)) % bs;
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memset(preq->pad, 0, sizeof(preq->pad));
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sg_init_table(preq->src, 1);
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sg_set_buf(preq->src, preq->pad, padlen);
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@ -285,7 +306,7 @@ static int poly_ad(struct aead_request *req)
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ahash_request_set_callback(&preq->req, aead_request_flags(req),
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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->assoc, NULL, req->assoclen);
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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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@ -351,11 +372,20 @@ static void poly_genkey_done(struct crypto_async_request *areq, int err)
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static int poly_genkey(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 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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sg_init_table(creq->src, 1);
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memset(rctx->key, 0, sizeof(rctx->key));
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sg_set_buf(creq->src, rctx->key, sizeof(rctx->key));
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@ -385,14 +415,24 @@ static int chacha_encrypt(struct aead_request *req)
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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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chacha_iv(creq->iv, req, 1);
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sg_init_table(rctx->src, 2);
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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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sg_init_table(rctx->dst, 2);
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dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);
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}
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ablkcipher_request_set_callback(&creq->req, aead_request_flags(req),
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chacha_encrypt_done, req);
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ablkcipher_request_set_tfm(&creq->req, ctx->chacha);
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ablkcipher_request_set_crypt(&creq->req, req->src, req->dst,
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ablkcipher_request_set_crypt(&creq->req, src, dst,
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req->cryptlen, creq->iv);
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err = crypto_ablkcipher_encrypt(&creq->req);
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if (err)
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@ -426,8 +466,6 @@ 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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if (req->cryptlen < POLY1305_DIGEST_SIZE)
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return -EINVAL;
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rctx->cryptlen = req->cryptlen - POLY1305_DIGEST_SIZE;
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/* decrypt call chain:
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@ -476,11 +514,11 @@ static int chachapoly_setauthsize(struct crypto_aead *tfm,
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return 0;
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}
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static int chachapoly_init(struct crypto_tfm *tfm)
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static int chachapoly_init(struct crypto_aead *tfm)
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{
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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struct chachapoly_instance_ctx *ictx = crypto_instance_ctx(inst);
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struct chachapoly_ctx *ctx = crypto_tfm_ctx(tfm);
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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_ablkcipher *chacha;
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struct crypto_ahash *poly;
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unsigned long align;
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@ -499,77 +537,88 @@ static int chachapoly_init(struct crypto_tfm *tfm)
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ctx->poly = poly;
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ctx->saltlen = ictx->saltlen;
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align = crypto_tfm_alg_alignmask(tfm);
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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(__crypto_aead_cast(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 ablkcipher_request) +
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crypto_ablkcipher_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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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 ablkcipher_request) +
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crypto_ablkcipher_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_tfm *tfm)
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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_tfm_ctx(tfm);
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struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);
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crypto_free_ahash(ctx->poly);
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crypto_free_ablkcipher(ctx->chacha);
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}
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static struct crypto_instance *chachapoly_alloc(struct rtattr **tb,
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const char *name,
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unsigned int ivsize)
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static void chachapoly_free(struct aead_instance *inst)
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{
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struct chachapoly_instance_ctx *ctx = aead_instance_ctx(inst);
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crypto_drop_skcipher(&ctx->chacha);
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crypto_drop_ahash(&ctx->poly);
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kfree(inst);
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}
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static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
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const char *name, unsigned int ivsize)
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{
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struct crypto_attr_type *algt;
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struct crypto_instance *inst;
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struct aead_instance *inst;
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struct crypto_alg *chacha;
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struct crypto_alg *poly;
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struct ahash_alg *poly_ahash;
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struct hash_alg_common *poly_hash;
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struct chachapoly_instance_ctx *ctx;
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const char *chacha_name, *poly_name;
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int err;
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if (ivsize > CHACHAPOLY_IV_SIZE)
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return ERR_PTR(-EINVAL);
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return -EINVAL;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return ERR_CAST(algt);
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return PTR_ERR(algt);
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if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
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return ERR_PTR(-EINVAL);
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if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_AEAD_NEW)) &
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algt->mask)
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return -EINVAL;
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chacha_name = crypto_attr_alg_name(tb[1]);
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if (IS_ERR(chacha_name))
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return ERR_CAST(chacha_name);
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return PTR_ERR(chacha_name);
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poly_name = crypto_attr_alg_name(tb[2]);
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if (IS_ERR(poly_name))
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return ERR_CAST(poly_name);
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return PTR_ERR(poly_name);
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poly = crypto_find_alg(poly_name, &crypto_ahash_type,
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CRYPTO_ALG_TYPE_HASH,
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CRYPTO_ALG_TYPE_AHASH_MASK);
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if (IS_ERR(poly))
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return ERR_CAST(poly);
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return PTR_ERR(poly);
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err = -ENOMEM;
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inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
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if (!inst)
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goto out_put_poly;
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ctx = crypto_instance_ctx(inst);
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ctx = aead_instance_ctx(inst);
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ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize;
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poly_ahash = container_of(poly, struct ahash_alg, halg.base);
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err = crypto_init_ahash_spawn(&ctx->poly, &poly_ahash->halg, inst);
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poly_hash = __crypto_hash_alg_common(poly);
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err = crypto_init_ahash_spawn(&ctx->poly, poly_hash,
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aead_crypto_instance(inst));
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if (err)
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goto err_free_inst;
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crypto_set_skcipher_spawn(&ctx->chacha, inst);
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crypto_set_skcipher_spawn(&ctx->chacha, aead_crypto_instance(inst));
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err = crypto_grab_skcipher(&ctx->chacha, chacha_name, 0,
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crypto_requires_sync(algt->type,
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algt->mask));
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@ -587,37 +636,43 @@ static struct crypto_instance *chachapoly_alloc(struct rtattr **tb,
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goto out_drop_chacha;
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
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if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
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"%s(%s,%s)", name, chacha_name,
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poly_name) >= CRYPTO_MAX_ALG_NAME)
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goto out_drop_chacha;
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if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
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"%s(%s,%s)", name, chacha->cra_driver_name,
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poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
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goto out_drop_chacha;
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inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
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inst->alg.cra_flags |= (chacha->cra_flags |
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poly->cra_flags) & CRYPTO_ALG_ASYNC;
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inst->alg.cra_priority = (chacha->cra_priority +
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poly->cra_priority) / 2;
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inst->alg.cra_blocksize = 1;
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inst->alg.cra_alignmask = chacha->cra_alignmask | poly->cra_alignmask;
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inst->alg.cra_type = &crypto_nivaead_type;
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inst->alg.cra_aead.ivsize = ivsize;
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inst->alg.cra_aead.maxauthsize = POLY1305_DIGEST_SIZE;
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inst->alg.cra_ctxsize = sizeof(struct chachapoly_ctx) + ctx->saltlen;
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inst->alg.cra_init = chachapoly_init;
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inst->alg.cra_exit = chachapoly_exit;
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inst->alg.cra_aead.encrypt = chachapoly_encrypt;
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inst->alg.cra_aead.decrypt = chachapoly_decrypt;
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inst->alg.cra_aead.setkey = chachapoly_setkey;
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inst->alg.cra_aead.setauthsize = chachapoly_setauthsize;
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inst->alg.cra_aead.geniv = "seqiv";
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inst->alg.base.cra_flags = (chacha->cra_flags | poly->cra_flags) &
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CRYPTO_ALG_ASYNC;
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inst->alg.base.cra_flags |= CRYPTO_ALG_AEAD_NEW;
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inst->alg.base.cra_priority = (chacha->cra_priority +
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poly->cra_priority) / 2;
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inst->alg.base.cra_blocksize = 1;
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inst->alg.base.cra_alignmask = chacha->cra_alignmask |
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poly->cra_alignmask;
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inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) +
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ctx->saltlen;
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inst->alg.ivsize = ivsize;
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inst->alg.maxauthsize = POLY1305_DIGEST_SIZE;
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inst->alg.init = chachapoly_init;
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inst->alg.exit = chachapoly_exit;
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inst->alg.encrypt = chachapoly_encrypt;
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inst->alg.decrypt = chachapoly_decrypt;
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inst->alg.setkey = chachapoly_setkey;
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inst->alg.setauthsize = chachapoly_setauthsize;
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out:
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inst->free = chachapoly_free;
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err = aead_register_instance(tmpl, inst);
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if (err)
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goto out_drop_chacha;
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out_put_poly:
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crypto_mod_put(poly);
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return inst;
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return err;
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out_drop_chacha:
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crypto_drop_skcipher(&ctx->chacha);
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@ -625,41 +680,28 @@ static struct crypto_instance *chachapoly_alloc(struct rtattr **tb,
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crypto_drop_ahash(&ctx->poly);
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err_free_inst:
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kfree(inst);
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out_put_poly:
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inst = ERR_PTR(err);
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goto out;
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goto out_put_poly;
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}
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static struct crypto_instance *rfc7539_alloc(struct rtattr **tb)
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static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb)
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{
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return chachapoly_alloc(tb, "rfc7539", 12);
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return chachapoly_create(tmpl, tb, "rfc7539", 12);
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}
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static struct crypto_instance *rfc7539esp_alloc(struct rtattr **tb)
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static int rfc7539esp_create(struct crypto_template *tmpl, struct rtattr **tb)
|
||||
{
|
||||
return chachapoly_alloc(tb, "rfc7539esp", 8);
|
||||
}
|
||||
|
||||
static void chachapoly_free(struct crypto_instance *inst)
|
||||
{
|
||||
struct chachapoly_instance_ctx *ctx = crypto_instance_ctx(inst);
|
||||
|
||||
crypto_drop_skcipher(&ctx->chacha);
|
||||
crypto_drop_ahash(&ctx->poly);
|
||||
kfree(inst);
|
||||
return chachapoly_create(tmpl, tb, "rfc7539esp", 8);
|
||||
}
|
||||
|
||||
static struct crypto_template rfc7539_tmpl = {
|
||||
.name = "rfc7539",
|
||||
.alloc = rfc7539_alloc,
|
||||
.free = chachapoly_free,
|
||||
.create = rfc7539_create,
|
||||
.module = THIS_MODULE,
|
||||
};
|
||||
|
||||
static struct crypto_template rfc7539esp_tmpl = {
|
||||
.name = "rfc7539esp",
|
||||
.alloc = rfc7539esp_alloc,
|
||||
.free = chachapoly_free,
|
||||
.create = rfc7539esp_create,
|
||||
.module = THIS_MODULE,
|
||||
};
|
||||
|
||||
|
|
@ -690,6 +732,5 @@ module_exit(chacha20poly1305_module_exit);
|
|||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
|
||||
MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD");
|
||||
MODULE_ALIAS_CRYPTO("chacha20poly1305");
|
||||
MODULE_ALIAS_CRYPTO("rfc7539");
|
||||
MODULE_ALIAS_CRYPTO("rfc7539esp");
|
||||
|
|
|
|||
|
|
@ -23577,8 +23577,9 @@ static struct aead_testvec rfc7539esp_enc_tv_template[] = {
|
|||
.klen = 36,
|
||||
.iv = "\x01\x02\x03\x04\x05\x06\x07\x08",
|
||||
.assoc = "\xf3\x33\x88\x86\x00\x00\x00\x00"
|
||||
"\x00\x00\x4e\x91",
|
||||
.alen = 12,
|
||||
"\x00\x00\x4e\x91\x01\x02\x03\x04"
|
||||
"\x05\x06\x07\x08",
|
||||
.alen = 20,
|
||||
.input = "\x49\x6e\x74\x65\x72\x6e\x65\x74"
|
||||
"\x2d\x44\x72\x61\x66\x74\x73\x20"
|
||||
"\x61\x72\x65\x20\x64\x72\x61\x66"
|
||||
|
|
@ -23664,8 +23665,9 @@ static struct aead_testvec rfc7539esp_dec_tv_template[] = {
|
|||
.klen = 36,
|
||||
.iv = "\x01\x02\x03\x04\x05\x06\x07\x08",
|
||||
.assoc = "\xf3\x33\x88\x86\x00\x00\x00\x00"
|
||||
"\x00\x00\x4e\x91",
|
||||
.alen = 12,
|
||||
"\x00\x00\x4e\x91\x01\x02\x03\x04"
|
||||
"\x05\x06\x07\x08",
|
||||
.alen = 20,
|
||||
.input = "\x64\xa0\x86\x15\x75\x86\x1a\xf4"
|
||||
"\x60\xf0\x62\xc7\x9b\xe6\x43\xbd"
|
||||
"\x5e\x80\x5c\xfd\x34\x5c\xf3\x89"
|
||||
|
|
|
|||
Loading…
Reference in a new issue