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aead/chacha20-poly1305: inline anycrypt

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Also use decrypt for the decryption path instead of relying on ChaCha20
using the same stream for encryption and decryption.
This commit is contained in:
Lucas Gabriel Vuotto 2024-06-09 02:19:51 +00:00
parent fdcba8bcf7
commit d2817487e8
1 changed files with 33 additions and 21 deletions
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54
aead_chacha20_poly1305.c
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@ -48,23 +48,6 @@ aead_poly1305_keysetup(struct lc_cipher_ctx *cctx,
return akeylen == LC_POLY1305_KEYLEN; return akeylen == LC_POLY1305_KEYLEN;
} }
static int
aead_poly1305_anycrypt(struct lc_cipher_ctx *cctx, uint8_t *out,
size_t *outlen, const void *initparams, const uint8_t *in, size_t inlen)
{
size_t olen;
if (!lc_cipher_encrypt_init(cctx, initparams) ||
!lc_cipher_encrypt_update(cctx, out, &olen, in, inlen))
return 0;
*outlen = olen;
if (!lc_cipher_encrypt_final(cctx, out + olen, &olen))
return 0;
*outlen += olen;
return *outlen == inlen;
}
static int static int
chacha20_poly1305_seal(uint8_t *out, size_t *outlen, const void *initparams, chacha20_poly1305_seal(uint8_t *out, size_t *outlen, const void *initparams,
const uint8_t *aad, size_t aadlen, const uint8_t *in, size_t inlen) const uint8_t *aad, size_t aadlen, const uint8_t *in, size_t inlen)
@ -118,7 +101,14 @@ chacha20_poly1305_seal(uint8_t *out, size_t *outlen, const void *initparams,
goto cleanup; goto cleanup;
cparams.counter = 1; cparams.counter = 1;
if (!aead_poly1305_anycrypt(cctx, out, outlen, &cparams, in, inlen)) if (!lc_cipher_encrypt_init(cctx, &cparams) ||
!lc_cipher_encrypt_update(cctx, out, &olen, in, inlen))
goto cleanup;
*outlen = olen;
if (!lc_cipher_encrypt_final(cctx, out + olen, &olen))
goto cleanup;
*outlen += olen;
if (*outlen != inlen)
goto cleanup; goto cleanup;
if (!lc_auth_update(actx, out, inlen)) if (!lc_auth_update(actx, out, inlen))
@ -200,7 +190,14 @@ xchacha20_poly1305_seal(uint8_t *out, size_t *outlen, const void *initparams,
goto cleanup; goto cleanup;
cparams.counter = 1; cparams.counter = 1;
if (!aead_poly1305_anycrypt(cctx, out, outlen, &cparams, in, inlen)) if (!lc_cipher_encrypt_init(cctx, &cparams) ||
!lc_cipher_encrypt_update(cctx, out, &olen, in, inlen))
goto cleanup;
*outlen = olen;
if (!lc_cipher_encrypt_final(cctx, out + olen, &olen))
goto cleanup;
*outlen += olen;
if (*outlen != inlen)
goto cleanup; goto cleanup;
if (!lc_auth_update(actx, out, inlen)) if (!lc_auth_update(actx, out, inlen))
@ -301,8 +298,16 @@ chacha20_poly1305_open(uint8_t *out, size_t *outlen, const void *initparams,
goto cleanup; goto cleanup;
cparams.counter = 1; cparams.counter = 1;
if (!aead_poly1305_anycrypt(cctx, out, outlen, &cparams, in, ctlen)) if (!lc_cipher_decrypt_init(cctx, &cparams) ||
!lc_cipher_decrypt_update(cctx, out, &olen, in, ctlen))
goto cleanup; goto cleanup;
*outlen = olen;
if (!lc_cipher_decrypt_final(cctx, out + olen, &olen))
goto cleanup;
*outlen += olen;
if (*outlen != ctlen)
goto cleanup;
ret = 1; ret = 1;
cleanup: cleanup:
@ -388,7 +393,14 @@ xchacha20_poly1305_open(uint8_t *out, size_t *outlen, const void *initparams,
goto cleanup; goto cleanup;
cparams.counter = 1; cparams.counter = 1;
if (!aead_poly1305_anycrypt(cctx, out, outlen, &cparams, in, ctlen)) if (!lc_cipher_decrypt_init(cctx, &cparams) ||
!lc_cipher_decrypt_update(cctx, out, &olen, in, ctlen))
goto cleanup;
*outlen = olen;
if (!lc_cipher_decrypt_final(cctx, out + olen, &olen))
goto cleanup;
*outlen += olen;
if (*outlen != ctlen)
goto cleanup; goto cleanup;
ret = 1; ret = 1;