Release 4.11 crypto/chacha20poly1305.c

Directory: crypto
/*
 * ChaCha20-Poly1305 AEAD, RFC7539
 *
 * Copyright (C) 2015 Martin Willi
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <crypto/internal/aead.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/chacha20.h>
#include <crypto/poly1305.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>

#include "internal.h"


#define CHACHAPOLY_IV_SIZE	12


struct chachapoly_instance_ctx {
	
struct crypto_skcipher_spawn chacha;
	
struct crypto_ahash_spawn poly;
	
unsigned int saltlen;
};


struct chachapoly_ctx {
	
struct crypto_skcipher *chacha;
	
struct crypto_ahash *poly;
	/* key bytes we use for the ChaCha20 IV */
	
unsigned int saltlen;
	
u8 salt[];
};


struct poly_req {
	/* zero byte padding for AD/ciphertext, as needed */
	
u8 pad[POLY1305_BLOCK_SIZE];
	/* tail data with AD/ciphertext lengths */
	struct {
		
__le64 assoclen;
		
__le64 cryptlen;
	} 
tail;
	
struct scatterlist src[1];
	
struct ahash_request req; /* must be last member */
};


struct chacha_req {
	
u8 iv[CHACHA20_IV_SIZE];
	
struct scatterlist src[1];
	
struct skcipher_request req; /* must be last member */
};


struct chachapoly_req_ctx {
	
struct scatterlist src[2];
	
struct scatterlist dst[2];
	/* the key we generate for Poly1305 using Chacha20 */
	
u8 key[POLY1305_KEY_SIZE];
	/* calculated Poly1305 tag */
	
u8 tag[POLY1305_DIGEST_SIZE];
	/* length of data to en/decrypt, without ICV */
	
unsigned int cryptlen;
	/* Actual AD, excluding IV */
	
unsigned int assoclen;
	union {
		
struct poly_req poly;
		
struct chacha_req chacha;
	} 
u;
};



static inline void async_done_continue(struct aead_request *req, int err,
				       int (*cont)(struct aead_request *))
{
	if (!err)
		err = cont(req);

	if (err != -EINPROGRESS && err != -EBUSY)
		aead_request_complete(req, err);
}

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Martin Willi 57 100.00% 1 100.00%
Total 57 100.00% 1 100.00%



static void chacha_iv(u8 *iv, struct aead_request *req, u32 icb)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
	__le32 leicb = cpu_to_le32(icb);

	memcpy(iv, &leicb, sizeof(leicb));
	memcpy(iv + sizeof(leicb), ctx->salt, ctx->saltlen);
	memcpy(iv + sizeof(leicb) + ctx->saltlen, req->iv,
	       CHACHA20_IV_SIZE - sizeof(leicb) - ctx->saltlen);
}

Contributors
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Martin Willi 99 100.00% 1 100.00%
Total 99 100.00% 1 100.00%



static int poly_verify_tag(struct aead_request *req)
{
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	u8 tag[sizeof(rctx->tag)];

	scatterwalk_map_and_copy(tag, req->src,
				 req->assoclen + rctx->cryptlen,
				 sizeof(tag), 0);
	if (crypto_memneq(tag, rctx->tag, sizeof(tag)))
		return -EBADMSG;
	return 0;
}

Contributors
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Martin Willi 75 94.94% 1 50.00%
Herbert Xu 4 5.06% 1 50.00%
Total 79 100.00% 2 100.00%



static int poly_copy_tag(struct aead_request *req)
{
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);

	scatterwalk_map_and_copy(rctx->tag, req->dst,
				 req->assoclen + rctx->cryptlen,
				 sizeof(rctx->tag), 1);
	return 0;
}

Contributors
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Martin Willi 48 92.31% 1 50.00%
Herbert Xu 4 7.69% 1 50.00%
Total 52 100.00% 2 100.00%



static void chacha_decrypt_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_verify_tag);
}

Contributors
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Martin Willi 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static int chacha_decrypt(struct aead_request *req)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct chacha_req *creq = &rctx->u.chacha;
	struct scatterlist *src, *dst;
	int err;

	if (rctx->cryptlen == 0)
		goto skip;

	chacha_iv(creq->iv, req, 1);

	sg_init_table(rctx->src, 2);
	src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen);
	dst = src;

	if (req->src != req->dst) {
		sg_init_table(rctx->dst, 2);
		dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);
	}

	skcipher_request_set_callback(&creq->req, aead_request_flags(req),
				      chacha_decrypt_done, req);
	skcipher_request_set_tfm(&creq->req, ctx->chacha);
	skcipher_request_set_crypt(&creq->req, src, dst,
				   rctx->cryptlen, creq->iv);
	err = crypto_skcipher_decrypt(&creq->req);
	if (err)
		return err;

skip:
	return poly_verify_tag(req);
}

Contributors
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Martin Willi 128 57.92% 1 25.00%
Herbert Xu 80 36.20% 2 50.00%
Jason A. Donenfeld 13 5.88% 1 25.00%
Total 221 100.00% 4 100.00%



static int poly_tail_continue(struct aead_request *req)
{
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);

	if (rctx->cryptlen == req->cryptlen) /* encrypting */
		return poly_copy_tag(req);

	return chacha_decrypt(req);
}

Contributors
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Martin Willi 44 100.00% 1 100.00%
Total 44 100.00% 1 100.00%



static void poly_tail_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_tail_continue);
}

Contributors
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Martin Willi 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static int poly_tail(struct aead_request *req)
{
	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct poly_req *preq = &rctx->u.poly;
	__le64 len;
	int err;

	sg_init_table(preq->src, 1);
	len = cpu_to_le64(rctx->assoclen);
	memcpy(&preq->tail.assoclen, &len, sizeof(len));
	len = cpu_to_le64(rctx->cryptlen);
	memcpy(&preq->tail.cryptlen, &len, sizeof(len));
	sg_set_buf(preq->src, &preq->tail, sizeof(preq->tail));

	ahash_request_set_callback(&preq->req, aead_request_flags(req),
				   poly_tail_done, req);
	ahash_request_set_tfm(&preq->req, ctx->poly);
	ahash_request_set_crypt(&preq->req, preq->src,
				rctx->tag, sizeof(preq->tail));

	err = crypto_ahash_finup(&preq->req);
	if (err)
		return err;

	return poly_tail_continue(req);
}

Contributors
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Martin Willi 204 94.44% 1 50.00%
Herbert Xu 12 5.56% 1 50.00%
Total 216 100.00% 2 100.00%



static void poly_cipherpad_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_tail);
}

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Martin Willi 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static int poly_cipherpad(struct aead_request *req)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct poly_req *preq = &rctx->u.poly;
	unsigned int padlen, bs = POLY1305_BLOCK_SIZE;
	int err;

	padlen = (bs - (rctx->cryptlen % bs)) % bs;
	memset(preq->pad, 0, sizeof(preq->pad));
	sg_init_table(preq->src, 1);
	sg_set_buf(preq->src, &preq->pad, padlen);

	ahash_request_set_callback(&preq->req, aead_request_flags(req),
				   poly_cipherpad_done, req);
	ahash_request_set_tfm(&preq->req, ctx->poly);
	ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen);

	err = crypto_ahash_update(&preq->req);
	if (err)
		return err;

	return poly_tail(req);
}

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Martin Willi 180 100.00% 1 100.00%
Total 180 100.00% 1 100.00%



static void poly_cipher_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_cipherpad);
}

Contributors
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Martin Willi 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static int poly_cipher(struct aead_request *req)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct poly_req *preq = &rctx->u.poly;
	struct scatterlist *crypt = req->src;
	int err;

	if (rctx->cryptlen == req->cryptlen) /* encrypting */
		crypt = req->dst;

	sg_init_table(rctx->src, 2);
	crypt = scatterwalk_ffwd(rctx->src, crypt, req->assoclen);

	ahash_request_set_callback(&preq->req, aead_request_flags(req),
				   poly_cipher_done, req);
	ahash_request_set_tfm(&preq->req, ctx->poly);
	ahash_request_set_crypt(&preq->req, crypt, NULL, rctx->cryptlen);

	err = crypto_ahash_update(&preq->req);
	if (err)
		return err;

	return poly_cipherpad(req);
}

Contributors
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Martin Willi 143 85.63% 1 50.00%
Herbert Xu 24 14.37% 1 50.00%
Total 167 100.00% 2 100.00%



static void poly_adpad_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_cipher);
}

Contributors
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Martin Willi 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static int poly_adpad(struct aead_request *req)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct poly_req *preq = &rctx->u.poly;
	unsigned int padlen, bs = POLY1305_BLOCK_SIZE;
	int err;

	padlen = (bs - (rctx->assoclen % bs)) % bs;
	memset(preq->pad, 0, sizeof(preq->pad));
	sg_init_table(preq->src, 1);
	sg_set_buf(preq->src, preq->pad, padlen);

	ahash_request_set_callback(&preq->req, aead_request_flags(req),
				   poly_adpad_done, req);
	ahash_request_set_tfm(&preq->req, ctx->poly);
	ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen);

	err = crypto_ahash_update(&preq->req);
	if (err)
		return err;

	return poly_cipher(req);
}

Contributors
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Martin Willi 178 99.44% 1 50.00%
Herbert Xu 1 0.56% 1 50.00%
Total 179 100.00% 2 100.00%



static void poly_ad_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_adpad);
}

Contributors
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Martin Willi 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static int poly_ad(struct aead_request *req)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct poly_req *preq = &rctx->u.poly;
	int err;

	ahash_request_set_callback(&preq->req, aead_request_flags(req),
				   poly_ad_done, req);
	ahash_request_set_tfm(&preq->req, ctx->poly);
	ahash_request_set_crypt(&preq->req, req->src, NULL, rctx->assoclen);

	err = crypto_ahash_update(&preq->req);
	if (err)
		return err;

	return poly_adpad(req);
}

Contributors
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Martin Willi 117 98.32% 1 50.00%
Herbert Xu 2 1.68% 1 50.00%
Total 119 100.00% 2 100.00%



static void poly_setkey_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_ad);
}

Contributors
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Martin Willi 25 100.00% 2 100.00%
Total 25 100.00% 2 100.00%



static int poly_setkey(struct aead_request *req)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct poly_req *preq = &rctx->u.poly;
	int err;

	sg_init_table(preq->src, 1);
	sg_set_buf(preq->src, rctx->key, sizeof(rctx->key));

	ahash_request_set_callback(&preq->req, aead_request_flags(req),
				   poly_setkey_done, req);
	ahash_request_set_tfm(&preq->req, ctx->poly);
	ahash_request_set_crypt(&preq->req, preq->src, NULL, sizeof(rctx->key));

	err = crypto_ahash_update(&preq->req);
	if (err)
		return err;

	return poly_ad(req);
}

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Martin Willi 149 100.00% 2 100.00%
Total 149 100.00% 2 100.00%



static void poly_init_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_setkey);
}

Contributors
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Martin Willi 25 100.00% 2 100.00%
Total 25 100.00% 2 100.00%



static int poly_init(struct aead_request *req)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct poly_req *preq = &rctx->u.poly;
	int err;

	ahash_request_set_callback(&preq->req, aead_request_flags(req),
				   poly_init_done, req);
	ahash_request_set_tfm(&preq->req, ctx->poly);

	err = crypto_ahash_init(&preq->req);
	if (err)
		return err;

	return poly_setkey(req);
}

Contributors
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Martin Willi 101 100.00% 2 100.00%
Total 101 100.00% 2 100.00%



static void poly_genkey_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_init);
}

Contributors
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Martin Willi 25 100.00% 2 100.00%
Total 25 100.00% 2 100.00%



static int poly_genkey(struct aead_request *req)
{
	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct chacha_req *creq = &rctx->u.chacha;
	int err;

	rctx->assoclen = req->assoclen;

	if (crypto_aead_ivsize(tfm) == 8) {
		if (rctx->assoclen < 8)
			return -EINVAL;
		rctx->assoclen -= 8;
	}

	sg_init_table(creq->src, 1);
	memset(rctx->key, 0, sizeof(rctx->key));
	sg_set_buf(creq->src, rctx->key, sizeof(rctx->key));

	chacha_iv(creq->iv, req, 0);

	skcipher_request_set_callback(&creq->req, aead_request_flags(req),
				      poly_genkey_done, req);
	skcipher_request_set_tfm(&creq->req, ctx->chacha);
	skcipher_request_set_crypt(&creq->req, creq->src, creq->src,
				   POLY1305_KEY_SIZE, creq->iv);

	err = crypto_skcipher_decrypt(&creq->req);
	if (err)
		return err;

	return poly_init(req);
}

Contributors
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Martin Willi 169 76.47% 2 50.00%
Herbert Xu 52 23.53% 2 50.00%
Total 221 100.00% 4 100.00%



static void chacha_encrypt_done(struct crypto_async_request *areq, int err)
{
	async_done_continue(areq->data, err, poly_genkey);
}

Contributors
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Martin Willi 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static int chacha_encrypt(struct aead_request *req)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
	struct chacha_req *creq = &rctx->u.chacha;
	struct scatterlist *src, *dst;
	int err;

	if (req->cryptlen == 0)
		goto skip;

	chacha_iv(creq->iv, req, 1);

	sg_init_table(rctx->src, 2);
	src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen);
	dst = src;

	if (req->src != req->dst) {
		sg_init_table(rctx->dst, 2);
		dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);
	}

	skcipher_request_set_callback(&creq->req, aead_request_flags(req),
				      chacha_encrypt_done, req);
	skcipher_request_set_tfm(&creq->req, ctx->chacha);
	skcipher_request_set_crypt(&creq->req, src, dst,
				   req->cryptlen, creq->iv);
	err = crypto_skcipher_encrypt(&creq->req);
	if (err)
		return err;

skip:
	return poly_genkey(req);
}

Contributors
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Martin Willi 109 49.32% 1 25.00%
Herbert Xu 99 44.80% 2 50.00%
Jason A. Donenfeld 13 5.88% 1 25.00%
Total 221 100.00% 4 100.00%



static int chachapoly_encrypt(struct aead_request *req)
{
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);

	rctx->cryptlen = req->cryptlen;

	/* encrypt call chain:
         * - chacha_encrypt/done()
         * - poly_genkey/done()
         * - poly_init/done()
         * - poly_setkey/done()
         * - poly_ad/done()
         * - poly_adpad/done()
         * - poly_cipher/done()
         * - poly_cipherpad/done()
         * - poly_tail/done/continue()
         * - poly_copy_tag()
         */
	return chacha_encrypt(req);
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 36 100.00% 2 100.00%
Total 36 100.00% 2 100.00%



static int chachapoly_decrypt(struct aead_request *req)
{
	struct chachapoly_req_ctx *rctx = aead_request_ctx(req);

	rctx->cryptlen = req->cryptlen - POLY1305_DIGEST_SIZE;

	/* decrypt call chain:
         * - poly_genkey/done()
         * - poly_init/done()
         * - poly_setkey/done()
         * - poly_ad/done()
         * - poly_adpad/done()
         * - poly_cipher/done()
         * - poly_cipherpad/done()
         * - poly_tail/done/continue()
         * - chacha_decrypt/done()
         * - poly_verify_tag()
         */
	return poly_genkey(req);
}

Contributors
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Martin Willi 38 100.00% 2 100.00%
Total 38 100.00% 2 100.00%



static int chachapoly_setkey(struct crypto_aead *aead, const u8 *key,
			     unsigned int keylen)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(aead);
	int err;

	if (keylen != ctx->saltlen + CHACHA20_KEY_SIZE)
		return -EINVAL;

	keylen -= ctx->saltlen;
	memcpy(ctx->salt, key + keylen, ctx->saltlen);

	crypto_skcipher_clear_flags(ctx->chacha, CRYPTO_TFM_REQ_MASK);
	crypto_skcipher_set_flags(ctx->chacha, crypto_aead_get_flags(aead) &
					       CRYPTO_TFM_REQ_MASK);

	err = crypto_skcipher_setkey(ctx->chacha, key, keylen);
	crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctx->chacha) &
				    CRYPTO_TFM_RES_MASK);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 117 96.69% 1 50.00%
Herbert Xu 4 3.31% 1 50.00%
Total 121 100.00% 2 100.00%



static int chachapoly_setauthsize(struct crypto_aead *tfm,
				  unsigned int authsize)
{
	if (authsize != POLY1305_DIGEST_SIZE)
		return -EINVAL;

	return 0;
}

Contributors
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Martin Willi 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%



static int chachapoly_init(struct crypto_aead *tfm)
{
	struct aead_instance *inst = aead_alg_instance(tfm);
	struct chachapoly_instance_ctx *ictx = aead_instance_ctx(inst);
	struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);
	struct crypto_skcipher *chacha;
	struct crypto_ahash *poly;
	unsigned long align;

	poly = crypto_spawn_ahash(&ictx->poly);
	if (IS_ERR(poly))
		return PTR_ERR(poly);

	chacha = crypto_spawn_skcipher(&ictx->chacha);
	if (IS_ERR(chacha)) {
		crypto_free_ahash(poly);
		return PTR_ERR(chacha);
	}

	ctx->chacha = chacha;
	ctx->poly = poly;
	ctx->saltlen = ictx->saltlen;

	align = crypto_aead_alignmask(tfm);
	align &= ~(crypto_tfm_ctx_alignment() - 1);
	crypto_aead_set_reqsize(
		tfm,
		align + offsetof(struct chachapoly_req_ctx, u) +
		max(offsetof(struct chacha_req, req) +
		    sizeof(struct skcipher_request) +
		    crypto_skcipher_reqsize(chacha),
		    offsetof(struct poly_req, req) +
		    sizeof(struct ahash_request) +
		    crypto_ahash_reqsize(poly)));

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 192 94.12% 1 25.00%
Herbert Xu 11 5.39% 2 50.00%
Eric Biggers 1 0.49% 1 25.00%
Total 204 100.00% 4 100.00%



static void chachapoly_exit(struct crypto_aead *tfm)
{
	struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);

	crypto_free_ahash(ctx->poly);
	crypto_free_skcipher(ctx->chacha);
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 32 91.43% 1 33.33%
Herbert Xu 3 8.57% 2 66.67%
Total 35 100.00% 3 100.00%



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);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 39 92.86% 1 50.00%
Martin Willi 3 7.14% 1 50.00%
Total 42 100.00% 2 100.00%



static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
			     const char *name, unsigned int ivsize)
{
	struct crypto_attr_type *algt;
	struct aead_instance *inst;
	struct skcipher_alg *chacha;
	struct crypto_alg *poly;
	struct hash_alg_common *poly_hash;
	struct chachapoly_instance_ctx *ctx;
	const char *chacha_name, *poly_name;
	int err;

	if (ivsize > CHACHAPOLY_IV_SIZE)
		return -EINVAL;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return PTR_ERR(algt);

	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
		return -EINVAL;

	chacha_name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(chacha_name))
		return PTR_ERR(chacha_name);
	poly_name = crypto_attr_alg_name(tb[2]);
	if (IS_ERR(poly_name))
		return PTR_ERR(poly_name);

	poly = crypto_find_alg(poly_name, &crypto_ahash_type,
			       CRYPTO_ALG_TYPE_HASH,
			       CRYPTO_ALG_TYPE_AHASH_MASK |
			       crypto_requires_sync(algt->type,
						    algt->mask));
	if (IS_ERR(poly))
		return PTR_ERR(poly);

	err = -ENOMEM;
	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
	if (!inst)
		goto out_put_poly;

	ctx = aead_instance_ctx(inst);
	ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize;
	poly_hash = __crypto_hash_alg_common(poly);
	err = crypto_init_ahash_spawn(&ctx->poly, poly_hash,
				      aead_crypto_instance(inst));
	if (err)
		goto err_free_inst;

	crypto_set_skcipher_spawn(&ctx->chacha, aead_crypto_instance(inst));
	err = crypto_grab_skcipher(&ctx->chacha, chacha_name, 0,
				   crypto_requires_sync(algt->type,
							algt->mask));
	if (err)
		goto err_drop_poly;

	chacha = crypto_spawn_skcipher_alg(&ctx->chacha);

	err = -EINVAL;
	/* Need 16-byte IV size, including Initial Block Counter value */
	if (crypto_skcipher_alg_ivsize(chacha) != CHACHA20_IV_SIZE)
		goto out_drop_chacha;
	/* Not a stream cipher? */
	if (chacha->base.cra_blocksize != 1)
		goto out_drop_chacha;

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
		     "%s(%s,%s)", name, chacha_name,
		     poly_name) >= CRYPTO_MAX_ALG_NAME)
		goto out_drop_chacha;
	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "%s(%s,%s)", name, chacha->base.cra_driver_name,
		     poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
		goto out_drop_chacha;

	inst->alg.base.cra_flags = (chacha->base.cra_flags | poly->cra_flags) &
				   CRYPTO_ALG_ASYNC;
	inst->alg.base.cra_priority = (chacha->base.cra_priority +
				       poly->cra_priority) / 2;
	inst->alg.base.cra_blocksize = 1;
	inst->alg.base.cra_alignmask = chacha->base.cra_alignmask |
				       poly->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)
		goto out_drop_chacha;

out_put_poly:
	crypto_mod_put(poly);
	return err;

out_drop_chacha:
	crypto_drop_skcipher(&ctx->chacha);
err_drop_poly:
	crypto_drop_ahash(&ctx->poly);
err_free_inst:
	kfree(inst);
	goto out_put_poly;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 548 83.28% 1 25.00%
Herbert Xu 109 16.57% 2 50.00%
Eric Biggers 1 0.15% 1 25.00%
Total 658 100.00% 4 100.00%



static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb)
{
	return chachapoly_create(tmpl, tb, "rfc7539", 12);
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 20 68.97% 1 50.00%
Herbert Xu 9 31.03% 1 50.00%
Total 29 100.00% 2 100.00%



static int rfc7539esp_create(struct crypto_template *tmpl, struct rtattr **tb)
{
	return chachapoly_create(tmpl, tb, "rfc7539esp", 8);
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 20 68.97% 1 50.00%
Herbert Xu 9 31.03% 1 50.00%
Total 29 100.00% 2 100.00%


static struct crypto_template rfc7539_tmpl = {
	.name = "rfc7539",
	.create = rfc7539_create,
	.module = THIS_MODULE,
};


static struct crypto_template rfc7539esp_tmpl = {
	.name = "rfc7539esp",
	.create = rfc7539esp_create,
	.module = THIS_MODULE,
};



static int __init chacha20poly1305_module_init(void)
{
	int err;

	err = crypto_register_template(&rfc7539_tmpl);
	if (err)
		return err;

	err = crypto_register_template(&rfc7539esp_tmpl);
	if (err)
		crypto_unregister_template(&rfc7539_tmpl);

	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 48 100.00% 2 100.00%
Total 48 100.00% 2 100.00%



static void __exit chacha20poly1305_module_exit(void)
{
	crypto_unregister_template(&rfc7539esp_tmpl);
	crypto_unregister_template(&rfc7539_tmpl);
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 21 100.00% 2 100.00%
Total 21 100.00% 2 100.00%


module_init(chacha20poly1305_module_init);

module_exit(chacha20poly1305_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD");
MODULE_ALIAS_CRYPTO("rfc7539");
MODULE_ALIAS_CRYPTO("rfc7539esp");
Overall Contributors
Person Tokens Prop Commits CommitProp
Martin Willi 3402 86.85% 5 50.00%
Herbert Xu 487 12.43% 2 20.00%
Jason A. Donenfeld 26 0.66% 1 10.00%
Eric Biggers 2 0.05% 2 20.00%
Total 3917 100.00% 10 100.00%
Directory: crypto

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Martin Willi	57	100.00%	1	100.00%
Total	57	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 crypto/chacha20poly1305.c

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