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-rw-r--r--crypto/chacha_generic.c (renamed from crypto/chacha20_generic.c)110
1 files changed, 59 insertions, 51 deletions
diff --git a/crypto/chacha20_generic.c b/crypto/chacha_generic.c
index 4305b1b6..438f15a1 100644
--- a/crypto/chacha20_generic.c
+++ b/crypto/chacha_generic.c
@@ -12,33 +12,33 @@
#include <asm/unaligned.h>
#include <crypto/algapi.h>
-#include <crypto/chacha20.h>
+#include <crypto/chacha.h>
#include <crypto/internal/skcipher.h>
#include <linux/module.h>
-static void chacha20_docrypt(u32 *state, u8 *dst, const u8 *src,
- unsigned int bytes)
+static void chacha_docrypt(u32 *state, u8 *dst, const u8 *src,
+ unsigned int bytes, int nrounds)
{
/* aligned to potentially speed up crypto_xor() */
- u8 stream[CHACHA20_BLOCK_SIZE] __aligned(sizeof(long));
+ u8 stream[CHACHA_BLOCK_SIZE] __aligned(sizeof(long));
if (dst != src)
memcpy(dst, src, bytes);
- while (bytes >= CHACHA20_BLOCK_SIZE) {
- chacha20_block(state, stream);
- crypto_xor(dst, stream, CHACHA20_BLOCK_SIZE);
- bytes -= CHACHA20_BLOCK_SIZE;
- dst += CHACHA20_BLOCK_SIZE;
+ while (bytes >= CHACHA_BLOCK_SIZE) {
+ chacha_block(state, stream, nrounds);
+ crypto_xor(dst, stream, CHACHA_BLOCK_SIZE);
+ bytes -= CHACHA_BLOCK_SIZE;
+ dst += CHACHA_BLOCK_SIZE;
}
if (bytes) {
- chacha20_block(state, stream);
+ chacha_block(state, stream, nrounds);
crypto_xor(dst, stream, bytes);
}
}
-static int chacha20_stream_xor(struct skcipher_request *req,
- struct chacha20_ctx *ctx, u8 *iv)
+static int chacha_stream_xor(struct skcipher_request *req,
+ struct chacha_ctx *ctx, u8 *iv)
{
struct skcipher_walk walk;
u32 state[16];
@@ -46,7 +46,7 @@ static int chacha20_stream_xor(struct skcipher_request *req,
err = skcipher_walk_virt(&walk, req, false);
- crypto_chacha20_init(state, ctx, iv);
+ crypto_chacha_init(state, ctx, iv);
while (walk.nbytes > 0) {
unsigned int nbytes = walk.nbytes;
@@ -54,15 +54,15 @@ static int chacha20_stream_xor(struct skcipher_request *req,
if (nbytes < walk.total)
nbytes = round_down(nbytes, walk.stride);
- chacha20_docrypt(state, walk.dst.virt.addr, walk.src.virt.addr,
- nbytes);
+ chacha_docrypt(state, walk.dst.virt.addr, walk.src.virt.addr,
+ nbytes, ctx->nrounds);
err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
}
return err;
}
-void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv)
+void crypto_chacha_init(u32 *state, struct chacha_ctx *ctx, u8 *iv)
{
state[0] = 0x61707865; /* "expa" */
state[1] = 0x3320646e; /* "nd 3" */
@@ -81,53 +81,61 @@ void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv)
state[14] = get_unaligned_le32(iv + 8);
state[15] = get_unaligned_le32(iv + 12);
}
-EXPORT_SYMBOL_GPL(crypto_chacha20_init);
+EXPORT_SYMBOL_GPL(crypto_chacha_init);
-int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
- unsigned int keysize)
+static int chacha_setkey(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int keysize, int nrounds)
{
- struct chacha20_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
int i;
- if (keysize != CHACHA20_KEY_SIZE)
+ if (keysize != CHACHA_KEY_SIZE)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(ctx->key); i++)
ctx->key[i] = get_unaligned_le32(key + i * sizeof(u32));
+ ctx->nrounds = nrounds;
return 0;
}
+
+int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int keysize)
+{
+ return chacha_setkey(tfm, key, keysize, 20);
+}
EXPORT_SYMBOL_GPL(crypto_chacha20_setkey);
-int crypto_chacha20_crypt(struct skcipher_request *req)
+int crypto_chacha_crypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct chacha20_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
- return chacha20_stream_xor(req, ctx, req->iv);
+ return chacha_stream_xor(req, ctx, req->iv);
}
-EXPORT_SYMBOL_GPL(crypto_chacha20_crypt);
+EXPORT_SYMBOL_GPL(crypto_chacha_crypt);
-int crypto_xchacha20_crypt(struct skcipher_request *req)
+int crypto_xchacha_crypt(struct skcipher_request *req)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
- struct chacha20_ctx *ctx = crypto_skcipher_ctx(tfm);
- struct chacha20_ctx subctx;
+ struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
+ struct chacha_ctx subctx;
u32 state[16];
u8 real_iv[16];
/* Compute the subkey given the original key and first 128 nonce bits */
- crypto_chacha20_init(state, ctx, req->iv);
- hchacha20_block(state, subctx.key);
+ crypto_chacha_init(state, ctx, req->iv);
+ hchacha_block(state, subctx.key, ctx->nrounds);
+ subctx.nrounds = ctx->nrounds;
/* Build the real IV */
memcpy(&real_iv[0], req->iv + 24, 8); /* stream position */
memcpy(&real_iv[8], req->iv + 16, 8); /* remaining 64 nonce bits */
/* Generate the stream and XOR it with the data */
- return chacha20_stream_xor(req, &subctx, real_iv);
+ return chacha_stream_xor(req, &subctx, real_iv);
}
-EXPORT_SYMBOL_GPL(crypto_xchacha20_crypt);
+EXPORT_SYMBOL_GPL(crypto_xchacha_crypt);
static struct skcipher_alg algs[] = {
{
@@ -135,50 +143,50 @@ static struct skcipher_alg algs[] = {
.base.cra_driver_name = "chacha20-generic",
.base.cra_priority = 100,
.base.cra_blocksize = 1,
- .base.cra_ctxsize = sizeof(struct chacha20_ctx),
+ .base.cra_ctxsize = sizeof(struct chacha_ctx),
.base.cra_module = THIS_MODULE,
- .min_keysize = CHACHA20_KEY_SIZE,
- .max_keysize = CHACHA20_KEY_SIZE,
- .ivsize = CHACHA20_IV_SIZE,
- .chunksize = CHACHA20_BLOCK_SIZE,
+ .min_keysize = CHACHA_KEY_SIZE,
+ .max_keysize = CHACHA_KEY_SIZE,
+ .ivsize = CHACHA_IV_SIZE,
+ .chunksize = CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha20_setkey,
- .encrypt = crypto_chacha20_crypt,
- .decrypt = crypto_chacha20_crypt,
+ .encrypt = crypto_chacha_crypt,
+ .decrypt = crypto_chacha_crypt,
}, {
.base.cra_name = "xchacha20",
.base.cra_driver_name = "xchacha20-generic",
.base.cra_priority = 100,
.base.cra_blocksize = 1,
- .base.cra_ctxsize = sizeof(struct chacha20_ctx),
+ .base.cra_ctxsize = sizeof(struct chacha_ctx),
.base.cra_module = THIS_MODULE,
- .min_keysize = CHACHA20_KEY_SIZE,
- .max_keysize = CHACHA20_KEY_SIZE,
- .ivsize = XCHACHA20_IV_SIZE,
- .chunksize = CHACHA20_BLOCK_SIZE,
+ .min_keysize = CHACHA_KEY_SIZE,
+ .max_keysize = CHACHA_KEY_SIZE,
+ .ivsize = XCHACHA_IV_SIZE,
+ .chunksize = CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha20_setkey,
- .encrypt = crypto_xchacha20_crypt,
- .decrypt = crypto_xchacha20_crypt,
+ .encrypt = crypto_xchacha_crypt,
+ .decrypt = crypto_xchacha_crypt,
}
};
-static int __init chacha20_generic_mod_init(void)
+static int __init chacha_generic_mod_init(void)
{
return crypto_register_skciphers(algs, ARRAY_SIZE(algs));
}
-static void __exit chacha20_generic_mod_fini(void)
+static void __exit chacha_generic_mod_fini(void)
{
crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
}
-module_init(chacha20_generic_mod_init);
-module_exit(chacha20_generic_mod_fini);
+module_init(chacha_generic_mod_init);
+module_exit(chacha_generic_mod_fini);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
-MODULE_DESCRIPTION("ChaCha20 and XChaCha20 stream ciphers (generic)");
+MODULE_DESCRIPTION("ChaCha and XChaCha stream ciphers (generic)");
MODULE_ALIAS_CRYPTO("chacha20");
MODULE_ALIAS_CRYPTO("chacha20-generic");
MODULE_ALIAS_CRYPTO("xchacha20");
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-20 13:29:33 +0000