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/*
* Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include "crypto/poly1305.h"
#include "poly1305_local.h"
#include "crypto/evp.h"
/* POLY1305 pkey context structure */
typedef struct {
ASN1_OCTET_STRING ktmp; /* Temp storage for key */
POLY1305 ctx;
} POLY1305_PKEY_CTX;
static int pkey_poly1305_init(EVP_PKEY_CTX *ctx)
{
POLY1305_PKEY_CTX *pctx;
if ((pctx = OPENSSL_zalloc(sizeof(*pctx))) == NULL) {
CRYPTOerr(CRYPTO_F_PKEY_POLY1305_INIT, ERR_R_MALLOC_FAILURE);
return 0;
}
pctx->ktmp.type = V_ASN1_OCTET_STRING;
EVP_PKEY_CTX_set_data(ctx, pctx);
EVP_PKEY_CTX_set0_keygen_info(ctx, NULL, 0);
return 1;
}
static void pkey_poly1305_cleanup(EVP_PKEY_CTX *ctx)
{
POLY1305_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
if (pctx != NULL) {
OPENSSL_clear_free(pctx->ktmp.data, pctx->ktmp.length);
OPENSSL_clear_free(pctx, sizeof(*pctx));
EVP_PKEY_CTX_set_data(ctx, NULL);
}
}
static int pkey_poly1305_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
POLY1305_PKEY_CTX *sctx, *dctx;
/* allocate memory for dst->data and a new POLY1305_CTX in dst->data->ctx */
if (!pkey_poly1305_init(dst))
return 0;
sctx = EVP_PKEY_CTX_get_data(src);
dctx = EVP_PKEY_CTX_get_data(dst);
if (ASN1_STRING_get0_data(&sctx->ktmp) != NULL &&
!ASN1_STRING_copy(&dctx->ktmp, &sctx->ktmp)) {
/* cleanup and free the POLY1305_PKEY_CTX in dst->data */
pkey_poly1305_cleanup(dst);
return 0;
}
memcpy(&dctx->ctx, &sctx->ctx, sizeof(POLY1305));
return 1;
}
static int pkey_poly1305_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
ASN1_OCTET_STRING *key;
POLY1305_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
if (ASN1_STRING_get0_data(&pctx->ktmp) == NULL)
return 0;
key = ASN1_OCTET_STRING_dup(&pctx->ktmp);
if (key == NULL)
return 0;
return EVP_PKEY_assign_POLY1305(pkey, key);
}
static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
{
POLY1305_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(EVP_MD_CTX_pkey_ctx(ctx));
Poly1305_Update(&pctx->ctx, data, count);
return 1;
}
static int poly1305_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
{
POLY1305_PKEY_CTX *pctx = ctx->data;
ASN1_OCTET_STRING *key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
if (key->length != POLY1305_KEY_SIZE)
return 0;
EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
EVP_MD_CTX_set_update_fn(mctx, int_update);
Poly1305_Init(&pctx->ctx, key->data);
return 1;
}
static int poly1305_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
EVP_MD_CTX *mctx)
{
POLY1305_PKEY_CTX *pctx = ctx->data;
*siglen = POLY1305_DIGEST_SIZE;
if (sig != NULL)
Poly1305_Final(&pctx->ctx, sig);
return 1;
}
static int pkey_poly1305_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
POLY1305_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
const unsigned char *key;
size_t len;
switch (type) {
case EVP_PKEY_CTRL_MD:
/* ignore */
break;
case EVP_PKEY_CTRL_SET_MAC_KEY:
case EVP_PKEY_CTRL_DIGESTINIT:
if (type == EVP_PKEY_CTRL_SET_MAC_KEY) {
/* user explicitly setting the key */
key = p2;
len = p1;
} else {
/* user indirectly setting the key via EVP_DigestSignInit */
key = EVP_PKEY_get0_poly1305(EVP_PKEY_CTX_get0_pkey(ctx), &len);
}
if (key == NULL || len != POLY1305_KEY_SIZE ||
!ASN1_OCTET_STRING_set(&pctx->ktmp, key, len))
return 0;
Poly1305_Init(&pctx->ctx, ASN1_STRING_get0_data(&pctx->ktmp));
break;
default:
return -2;
}
return 1;
}
static int pkey_poly1305_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (value == NULL)
return 0;
if (strcmp(type, "key") == 0)
return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
if (strcmp(type, "hexkey") == 0)
return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
return -2;
}
const EVP_PKEY_METHOD poly1305_pkey_meth = {
EVP_PKEY_POLY1305,
EVP_PKEY_FLAG_SIGCTX_CUSTOM, /* we don't deal with a separate MD */
pkey_poly1305_init,
pkey_poly1305_copy,
pkey_poly1305_cleanup,
0, 0,
0,
pkey_poly1305_keygen,
0, 0,
0, 0,
0, 0,
poly1305_signctx_init,
poly1305_signctx,
0, 0,
0, 0,
0, 0,
0, 0,
pkey_poly1305_ctrl,
pkey_poly1305_ctrl_str
};
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