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cipher/xchacha20: add one-pass implementation 

Fix the function pointers while at it.
This commit is contained in:
Lucas Gabriel Vuotto 2024-06-11 03:07:53 +00:00
parent fb2139eeee
commit 2b76f3df5b
1 changed files with 32 additions and 2 deletions
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34
cipher_chacha20.c
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@ -209,6 +209,36 @@ chacha20_anycrypt(uint8_t *out, size_t *outlen, void *initparams,
return rc;
}
static int
xchacha20_anycrypt(uint8_t *out, size_t *outlen, void *initparams,
const uint8_t *in, size_t inlen)
{
struct chacha20_ctx ctx;
size_t l0, l1;
int rc;
*outlen = 0;
if (inlen > SIZE_MAX - (LC_CHACHA20_BLOCKLEN - 1) ||
(inlen + LC_CHACHA20_BLOCKLEN - 1) / LC_CHACHA20_BLOCKLEN >
CHACHA20_CTRMAX)
return 0;
if (out == NULL) {
*outlen = inlen;
return 1;
}
rc = xchacha20_anycrypt_init(&ctx, initparams) &&
chacha20_anycrypt_update(&ctx, out, &l0, in, inlen) &&
chacha20_anycrypt_final(&ctx, out + l0, &l1);
if (rc)
*outlen = l0 + l1;
return rc;
}
static struct lc_cipher_impl chacha20_impl = {
.encrypt_init = &chacha20_anycrypt_init,
@ -229,12 +259,12 @@ static struct lc_cipher_impl xchacha20_impl = {
.encrypt_init = &xchacha20_anycrypt_init,
.encrypt_update = &chacha20_anycrypt_update,
.encrypt_final = &chacha20_anycrypt_final,
.encrypt = &chacha20_anycrypt,
.encrypt = &xchacha20_anycrypt,
.decrypt_init = &xchacha20_anycrypt_init,
.decrypt_update = &chacha20_anycrypt_update,
.decrypt_final = &chacha20_anycrypt_final,
.decrypt = &chacha20_anycrypt,
.decrypt = &xchacha20_anycrypt,
.argsz = sizeof(struct chacha20_ctx),
.blocklen = LC_XCHACHA20_BLOCKLEN,