100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
// Copyright (c) 2017, Google Inc.
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// SPDX-License-Identifier: ISC
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#include <openssl/evp.h>
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#include <openssl/curve25519.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include "internal.h"
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#include "../curve25519/internal.h"
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// Ed25519 has no parameters to copy.
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static int pkey_ed25519_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { return 1; }
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static int pkey_ed25519_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) {
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ED25519_KEY *key = OPENSSL_malloc(sizeof(ED25519_KEY));
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if (key == NULL) {
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return 0;
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}
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evp_pkey_set_method(pkey, &ed25519_asn1_meth);
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uint8_t pubkey_unused[32];
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int result = ED25519_keypair_internal(pubkey_unused, key->key);
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if (result) {
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key->has_private = 1;
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OPENSSL_free(pkey->pkey.ptr);
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pkey->pkey.ptr = key;
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}
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return result;
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}
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static int pkey_ed25519_sign_message(EVP_PKEY_CTX *ctx, uint8_t *sig,
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size_t *siglen, const uint8_t *tbs,
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size_t tbslen) {
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ED25519_KEY *key = ctx->pkey->pkey.ptr;
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if (!key->has_private) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_NOT_A_PRIVATE_KEY);
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return 0;
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}
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if (sig == NULL) {
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*siglen = 64;
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return 1;
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}
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if (*siglen < 64) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL);
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return 0;
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}
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if (!ED25519_sign(sig, tbs, tbslen, key->key)) {
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return 0;
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}
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*siglen = 64;
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return 1;
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}
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static int pkey_ed25519_verify_message(EVP_PKEY_CTX *ctx, const uint8_t *sig,
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size_t siglen, const uint8_t *tbs,
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size_t tbslen) {
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ED25519_KEY *key = ctx->pkey->pkey.ptr;
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if (siglen != 64 ||
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!ED25519_verify(tbs, tbslen, sig, key->key + ED25519_PUBLIC_KEY_OFFSET)) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_SIGNATURE);
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return 0;
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}
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return 1;
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}
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DEFINE_METHOD_FUNCTION(EVP_PKEY_METHOD, EVP_PKEY_ed25519_pkey_meth) {
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out->pkey_id = EVP_PKEY_ED25519;
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out->init = NULL;
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out->copy = pkey_ed25519_copy;
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out->cleanup = NULL;
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out->keygen = pkey_ed25519_keygen;
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out->sign_init = NULL;
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out->sign = NULL;
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out->sign_message = pkey_ed25519_sign_message;
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out->verify_init = NULL;
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out->verify = NULL;
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out->verify_message = pkey_ed25519_verify_message;
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out->verify_recover = NULL;
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out->encrypt = NULL;
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out->decrypt = NULL;
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out->derive = NULL;
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out->paramgen = NULL;
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out->ctrl = NULL;
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out->ctrl_str = NULL;
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out->keygen_deterministic = NULL;
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out->encapsulate_deterministic = NULL;
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out->encapsulate = NULL;
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out->decapsulate = NULL;
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}
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