-/**
- * @file ed448goldilocks/eddsa.c
- * @author Mike Hamburg
+/*
+ * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2015-2016 Cryptography Research, Inc.
*
- * @copyright
- * Copyright (c) 2015-2016 Cryptography Research, Inc. \n
- * Released under the MIT License. See LICENSE.txt for license information.
+ * 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
*
- * @cond internal
- * @brief EdDSA routines.
- *
- * @warning This file was automatically generated in Python.
- * Please do not edit it.
+ * Originally written by Mike Hamburg
*/
+#include <openssl/crypto.h>
+#include <openssl/evp.h>
+
+#include "curve448_lcl.h"
#include "word.h"
#include "ed448.h"
-#include "shake.h"
#include <string.h>
+#include "internal/numbers.h"
#define API_NAME "decaf_448"
-#define API_NS(_id) decaf_448_##_id
-
-#define hash_ctx_t decaf_shake256_ctx_t
-#define hash_init decaf_shake256_init
-#define hash_update decaf_shake256_update
-#define hash_final decaf_shake256_final
-#define hash_destroy decaf_shake256_destroy
-#define hash_hash decaf_shake256_hash
#define NO_CONTEXT DECAF_EDDSA_448_SUPPORTS_CONTEXTLESS_SIGS
#define EDDSA_USE_SIGMA_ISOGENY 0
#if NO_CONTEXT
const uint8_t NO_CONTEXT_POINTS_HERE = 0;
-const uint8_t * const DECAF_ED448_NO_CONTEXT = &NO_CONTEXT_POINTS_HERE;
+const uint8_t *const DECAF_ED448_NO_CONTEXT = &NO_CONTEXT_POINTS_HERE;
#endif
-/* EDDSA_BASE_POINT_RATIO = 1 or 2
- * Because EdDSA25519 is not on E_d but on the isogenous E_sigma_d,
- * its base point is twice ours.
+/*
+ * EDDSA_BASE_POINT_RATIO = 1 or 2 Because EdDSA25519 is not on E_d but on the
+ * isogenous E_sigma_d, its base point is twice ours.
*/
#define EDDSA_BASE_POINT_RATIO (1+EDDSA_USE_SIGMA_ISOGENY) /* TODO: remove */
-static void clamp (
- uint8_t secret_scalar_ser[DECAF_EDDSA_448_PRIVATE_BYTES]
-) {
+static decaf_error_t oneshot_hash(uint8_t *out, size_t outlen,
+ const uint8_t *in, size_t inlen)
+{
+ EVP_MD_CTX *hashctx = EVP_MD_CTX_new();
+
+ if (hashctx == NULL)
+ return DECAF_FAILURE;
+
+ if (!EVP_DigestInit_ex(hashctx, EVP_shake256(), NULL)
+ || !EVP_DigestUpdate(hashctx, in, inlen)
+ || !EVP_DigestFinalXOF(hashctx, out, outlen)) {
+ EVP_MD_CTX_free(hashctx);
+ return DECAF_FAILURE;
+ }
+
+ EVP_MD_CTX_free(hashctx);
+ return DECAF_SUCCESS;
+}
+
+static void clamp(uint8_t secret_scalar_ser[DECAF_EDDSA_448_PRIVATE_BYTES]
+ )
+{
+ uint8_t hibit = (1 << 0) >> 1;
+
/* Blarg */
secret_scalar_ser[0] &= -COFACTOR;
- uint8_t hibit = (1<<0)>>1;
if (hibit == 0) {
secret_scalar_ser[DECAF_EDDSA_448_PRIVATE_BYTES - 1] = 0;
secret_scalar_ser[DECAF_EDDSA_448_PRIVATE_BYTES - 2] |= 0x80;
} else {
- secret_scalar_ser[DECAF_EDDSA_448_PRIVATE_BYTES - 1] &= hibit-1;
+ secret_scalar_ser[DECAF_EDDSA_448_PRIVATE_BYTES - 1] &= hibit - 1;
secret_scalar_ser[DECAF_EDDSA_448_PRIVATE_BYTES - 1] |= hibit;
}
}
-static void hash_init_with_dom(
- hash_ctx_t hash,
- uint8_t prehashed,
- uint8_t for_prehash,
- const uint8_t *context,
- uint8_t context_len
-) {
- hash_init(hash);
+static decaf_error_t hash_init_with_dom(EVP_MD_CTX *hashctx,
+ uint8_t prehashed,
+ uint8_t for_prehash,
+ const uint8_t *context,
+ size_t context_len)
+{
+ const char *dom_s = "SigEd448";
+ uint8_t dom[2];
+
+ dom[0] = 2 + word_is_zero(prehashed) + word_is_zero(for_prehash);
+ dom[1] = (uint8_t)context_len;
+
+ if (context_len > UINT8_MAX)
+ return DECAF_FAILURE;
#if NO_CONTEXT
if (context_len == 0 && context == DECAF_ED448_NO_CONTEXT) {
(void)for_prehash;
(void)context;
(void)context_len;
- return;
+ return DECAF_SUCCESS;
}
#endif
- const char *dom_s = "SigEd448";
- const uint8_t dom[2] = {2+word_is_zero(prehashed)+word_is_zero(for_prehash), context_len};
- hash_update(hash,(const unsigned char *)dom_s, strlen(dom_s));
- hash_update(hash,dom,2);
- hash_update(hash,context,context_len);
-}
-void decaf_ed448_prehash_init (
- hash_ctx_t hash
-) {
- hash_init(hash);
+ if (!EVP_DigestInit_ex(hashctx, EVP_shake256(), NULL)
+ || !EVP_DigestUpdate(hashctx, dom_s, strlen(dom_s))
+ || !EVP_DigestUpdate(hashctx, dom, sizeof(dom))
+ || !EVP_DigestUpdate(hashctx, context, context_len))
+ return DECAF_FAILURE;
+
+ return DECAF_SUCCESS;
}
/* In this file because it uses the hash */
-void decaf_ed448_convert_private_key_to_x448 (
- uint8_t x[DECAF_X448_PRIVATE_BYTES],
- const uint8_t ed[DECAF_EDDSA_448_PRIVATE_BYTES]
-) {
- /* pass the private key through hash_hash function */
+decaf_error_t decaf_ed448_convert_private_key_to_x448(uint8_t
+ x
+ [DECAF_X448_PRIVATE_BYTES],
+ const uint8_t
+ ed
+ [DECAF_EDDSA_448_PRIVATE_BYTES]
+ )
+{
+ /* pass the private key through oneshot_hash function */
/* and keep the first DECAF_X448_PRIVATE_BYTES bytes */
- hash_hash(
- x,
- DECAF_X448_PRIVATE_BYTES,
- ed,
- DECAF_EDDSA_448_PRIVATE_BYTES
- );
+ return oneshot_hash(x,
+ DECAF_X448_PRIVATE_BYTES,
+ ed, DECAF_EDDSA_448_PRIVATE_BYTES);
}
-
-void decaf_ed448_derive_public_key (
- uint8_t pubkey[DECAF_EDDSA_448_PUBLIC_BYTES],
- const uint8_t privkey[DECAF_EDDSA_448_PRIVATE_BYTES]
-) {
+
+decaf_error_t decaf_ed448_derive_public_key(uint8_t
+ pubkey
+ [DECAF_EDDSA_448_PUBLIC_BYTES],
+ const uint8_t
+ privkey
+ [DECAF_EDDSA_448_PRIVATE_BYTES]
+ )
+{
/* only this much used for keygen */
uint8_t secret_scalar_ser[DECAF_EDDSA_448_PRIVATE_BYTES];
-
- hash_hash(
- secret_scalar_ser,
- sizeof(secret_scalar_ser),
- privkey,
- DECAF_EDDSA_448_PRIVATE_BYTES
- );
+ curve448_scalar_t secret_scalar;
+ unsigned int c;
+ curve448_point_t p;
+
+ if (!oneshot_hash(secret_scalar_ser, sizeof(secret_scalar_ser), privkey,
+ DECAF_EDDSA_448_PRIVATE_BYTES)) {
+ return DECAF_FAILURE;
+ }
clamp(secret_scalar_ser);
-
- API_NS(scalar_t) secret_scalar;
- API_NS(scalar_decode_long)(secret_scalar, secret_scalar_ser, sizeof(secret_scalar_ser));
-
- /* Since we are going to mul_by_cofactor during encoding, divide by it here.
- * However, the EdDSA base point is not the same as the decaf base point if
- * the sigma isogeny is in use: the EdDSA base point is on Etwist_d/(1-d) and
- * the decaf base point is on Etwist_d, and when converted it effectively
- * picks up a factor of 2 from the isogenies. So we might start at 2 instead of 1.
+
+ curve448_scalar_decode_long(secret_scalar, secret_scalar_ser,
+ sizeof(secret_scalar_ser));
+
+ /*
+ * Since we are going to mul_by_cofactor during encoding, divide by it
+ * here. However, the EdDSA base point is not the same as the decaf base
+ * point if the sigma isogeny is in use: the EdDSA base point is on
+ * Etwist_d/(1-d) and the decaf base point is on Etwist_d, and when
+ * converted it effectively picks up a factor of 2 from the isogenies. So
+ * we might start at 2 instead of 1.
*/
- for (unsigned int c=1; c<DECAF_448_EDDSA_ENCODE_RATIO; c <<= 1) {
- API_NS(scalar_halve)(secret_scalar,secret_scalar);
+ for (c = 1; c < DECAF_448_EDDSA_ENCODE_RATIO; c <<= 1) {
+ curve448_scalar_halve(secret_scalar, secret_scalar);
}
-
- API_NS(point_t) p;
- API_NS(precomputed_scalarmul)(p,API_NS(precomputed_base),secret_scalar);
-
- API_NS(point_mul_by_ratio_and_encode_like_eddsa)(pubkey, p);
-
+
+ curve448_precomputed_scalarmul(p, curve448_precomputed_base, secret_scalar);
+
+ curve448_point_mul_by_ratio_and_encode_like_eddsa(pubkey, p);
+
/* Cleanup */
- API_NS(scalar_destroy)(secret_scalar);
- API_NS(point_destroy)(p);
- decaf_bzero(secret_scalar_ser, sizeof(secret_scalar_ser));
+ curve448_scalar_destroy(secret_scalar);
+ curve448_point_destroy(p);
+ OPENSSL_cleanse(secret_scalar_ser, sizeof(secret_scalar_ser));
+
+ return DECAF_SUCCESS;
}
-void decaf_ed448_sign (
- uint8_t signature[DECAF_EDDSA_448_SIGNATURE_BYTES],
- const uint8_t privkey[DECAF_EDDSA_448_PRIVATE_BYTES],
- const uint8_t pubkey[DECAF_EDDSA_448_PUBLIC_BYTES],
- const uint8_t *message,
- size_t message_len,
- uint8_t prehashed,
- const uint8_t *context,
- uint8_t context_len
-) {
- API_NS(scalar_t) secret_scalar;
- hash_ctx_t hash;
+decaf_error_t decaf_ed448_sign(uint8_t
+ signature[DECAF_EDDSA_448_SIGNATURE_BYTES],
+ const uint8_t
+ privkey[DECAF_EDDSA_448_PRIVATE_BYTES],
+ const uint8_t
+ pubkey[DECAF_EDDSA_448_PUBLIC_BYTES],
+ const uint8_t *message, size_t message_len,
+ uint8_t prehashed, const uint8_t *context,
+ size_t context_len)
+{
+ curve448_scalar_t secret_scalar;
+ EVP_MD_CTX *hashctx = EVP_MD_CTX_new();
+ decaf_error_t ret = DECAF_FAILURE;
+ curve448_scalar_t nonce_scalar;
+ uint8_t nonce_point[DECAF_EDDSA_448_PUBLIC_BYTES] = { 0 };
+ unsigned int c;
+ curve448_scalar_t challenge_scalar;
+
+ if (hashctx == NULL)
+ return DECAF_FAILURE;
+
{
/* Schedule the secret key */
struct {
uint8_t secret_scalar_ser[DECAF_EDDSA_448_PRIVATE_BYTES];
uint8_t seed[DECAF_EDDSA_448_PRIVATE_BYTES];
- } __attribute__((packed)) expanded;
- hash_hash(
- (uint8_t *)&expanded,
- sizeof(expanded),
- privkey,
- DECAF_EDDSA_448_PRIVATE_BYTES
- );
- clamp(expanded.secret_scalar_ser);
- API_NS(scalar_decode_long)(secret_scalar, expanded.secret_scalar_ser, sizeof(expanded.secret_scalar_ser));
-
+ } __attribute__ ((packed)) expanded;
+
+ if (!oneshot_hash((uint8_t *)&expanded, sizeof(expanded), privkey,
+ DECAF_EDDSA_448_PRIVATE_BYTES))
+ goto err;
+ clamp(expanded.secret_scalar_ser);
+ curve448_scalar_decode_long(secret_scalar, expanded.secret_scalar_ser,
+ sizeof(expanded.secret_scalar_ser));
+
/* Hash to create the nonce */
- hash_init_with_dom(hash,prehashed,0,context,context_len);
- hash_update(hash,expanded.seed,sizeof(expanded.seed));
- hash_update(hash,message,message_len);
- decaf_bzero(&expanded, sizeof(expanded));
+ if (!hash_init_with_dom(hashctx, prehashed, 0, context, context_len)
+ || !EVP_DigestUpdate(hashctx, expanded.seed, sizeof(expanded.seed))
+ || !EVP_DigestUpdate(hashctx, message, message_len)) {
+ OPENSSL_cleanse(&expanded, sizeof(expanded));
+ goto err;
+ }
+ OPENSSL_cleanse(&expanded, sizeof(expanded));
}
-
+
/* Decode the nonce */
- API_NS(scalar_t) nonce_scalar;
{
- uint8_t nonce[2*DECAF_EDDSA_448_PRIVATE_BYTES];
- hash_final(hash,nonce,sizeof(nonce));
- API_NS(scalar_decode_long)(nonce_scalar, nonce, sizeof(nonce));
- decaf_bzero(nonce, sizeof(nonce));
+ uint8_t nonce[2 * DECAF_EDDSA_448_PRIVATE_BYTES];
+
+ if (!EVP_DigestFinalXOF(hashctx, nonce, sizeof(nonce)))
+ goto err;
+ curve448_scalar_decode_long(nonce_scalar, nonce, sizeof(nonce));
+ OPENSSL_cleanse(nonce, sizeof(nonce));
}
-
- uint8_t nonce_point[DECAF_EDDSA_448_PUBLIC_BYTES] = {0};
+
{
/* Scalarmul to create the nonce-point */
- API_NS(scalar_t) nonce_scalar_2;
- API_NS(scalar_halve)(nonce_scalar_2,nonce_scalar);
- for (unsigned int c = 2; c < DECAF_448_EDDSA_ENCODE_RATIO; c <<= 1) {
- API_NS(scalar_halve)(nonce_scalar_2,nonce_scalar_2);
+ curve448_scalar_t nonce_scalar_2;
+ curve448_point_t p;
+
+ curve448_scalar_halve(nonce_scalar_2, nonce_scalar);
+ for (c = 2; c < DECAF_448_EDDSA_ENCODE_RATIO; c <<= 1) {
+ curve448_scalar_halve(nonce_scalar_2, nonce_scalar_2);
}
-
- API_NS(point_t) p;
- API_NS(precomputed_scalarmul)(p,API_NS(precomputed_base),nonce_scalar_2);
- API_NS(point_mul_by_ratio_and_encode_like_eddsa)(nonce_point, p);
- API_NS(point_destroy)(p);
- API_NS(scalar_destroy)(nonce_scalar_2);
+
+ curve448_precomputed_scalarmul(p, curve448_precomputed_base,
+ nonce_scalar_2);
+ curve448_point_mul_by_ratio_and_encode_like_eddsa(nonce_point, p);
+ curve448_point_destroy(p);
+ curve448_scalar_destroy(nonce_scalar_2);
}
-
- API_NS(scalar_t) challenge_scalar;
+
{
+ uint8_t challenge[2 * DECAF_EDDSA_448_PRIVATE_BYTES];
+
/* Compute the challenge */
- hash_init_with_dom(hash,prehashed,0,context,context_len);
- hash_update(hash,nonce_point,sizeof(nonce_point));
- hash_update(hash,pubkey,DECAF_EDDSA_448_PUBLIC_BYTES);
- hash_update(hash,message,message_len);
- uint8_t challenge[2*DECAF_EDDSA_448_PRIVATE_BYTES];
- hash_final(hash,challenge,sizeof(challenge));
- hash_destroy(hash);
- API_NS(scalar_decode_long)(challenge_scalar,challenge,sizeof(challenge));
- decaf_bzero(challenge,sizeof(challenge));
+ if (!hash_init_with_dom(hashctx, prehashed, 0, context, context_len)
+ || !EVP_DigestUpdate(hashctx, nonce_point, sizeof(nonce_point))
+ || !EVP_DigestUpdate(hashctx, pubkey, DECAF_EDDSA_448_PUBLIC_BYTES)
+ || !EVP_DigestUpdate(hashctx, message, message_len)
+ || !EVP_DigestFinalXOF(hashctx, challenge, sizeof(challenge)))
+ goto err;
+
+ curve448_scalar_decode_long(challenge_scalar, challenge,
+ sizeof(challenge));
+ OPENSSL_cleanse(challenge, sizeof(challenge));
}
-
- API_NS(scalar_mul)(challenge_scalar,challenge_scalar,secret_scalar);
- API_NS(scalar_add)(challenge_scalar,challenge_scalar,nonce_scalar);
-
- decaf_bzero(signature,DECAF_EDDSA_448_SIGNATURE_BYTES);
- memcpy(signature,nonce_point,sizeof(nonce_point));
- API_NS(scalar_encode)(&signature[DECAF_EDDSA_448_PUBLIC_BYTES],challenge_scalar);
-
- API_NS(scalar_destroy)(secret_scalar);
- API_NS(scalar_destroy)(nonce_scalar);
- API_NS(scalar_destroy)(challenge_scalar);
+
+ curve448_scalar_mul(challenge_scalar, challenge_scalar, secret_scalar);
+ curve448_scalar_add(challenge_scalar, challenge_scalar, nonce_scalar);
+
+ OPENSSL_cleanse(signature, DECAF_EDDSA_448_SIGNATURE_BYTES);
+ memcpy(signature, nonce_point, sizeof(nonce_point));
+ curve448_scalar_encode(&signature[DECAF_EDDSA_448_PUBLIC_BYTES],
+ challenge_scalar);
+
+ curve448_scalar_destroy(secret_scalar);
+ curve448_scalar_destroy(nonce_scalar);
+ curve448_scalar_destroy(challenge_scalar);
+
+ ret = DECAF_SUCCESS;
+ err:
+ EVP_MD_CTX_free(hashctx);
+ return ret;
+}
+
+decaf_error_t decaf_ed448_sign_prehash(uint8_t
+ signature
+ [DECAF_EDDSA_448_SIGNATURE_BYTES],
+ const uint8_t
+ privkey[DECAF_EDDSA_448_PRIVATE_BYTES],
+ const uint8_t
+ pubkey[DECAF_EDDSA_448_PUBLIC_BYTES],
+ const uint8_t hash[64],
+ const uint8_t *context,
+ size_t context_len)
+{
+ return decaf_ed448_sign(signature, privkey, pubkey, hash, 64, 1, context,
+ context_len);
+ /*
+ * OPENSSL_cleanse(hash,sizeof(hash));
+ */
}
+decaf_error_t decaf_ed448_verify(const uint8_t
+ signature[DECAF_EDDSA_448_SIGNATURE_BYTES],
+ const uint8_t
+ pubkey[DECAF_EDDSA_448_PUBLIC_BYTES],
+ const uint8_t *message, size_t message_len,
+ uint8_t prehashed, const uint8_t *context,
+ uint8_t context_len)
+{
+ curve448_point_t pk_point, r_point;
+ decaf_error_t error =
+ curve448_point_decode_like_eddsa_and_mul_by_ratio(pk_point, pubkey);
+ curve448_scalar_t challenge_scalar;
+ curve448_scalar_t response_scalar;
+ unsigned int c;
-void decaf_ed448_sign_prehash (
- uint8_t signature[DECAF_EDDSA_448_SIGNATURE_BYTES],
- const uint8_t privkey[DECAF_EDDSA_448_PRIVATE_BYTES],
- const uint8_t pubkey[DECAF_EDDSA_448_PUBLIC_BYTES],
- const decaf_ed448_prehash_ctx_t hash,
- const uint8_t *context,
- uint8_t context_len
-) {
- uint8_t hash_output[EDDSA_PREHASH_BYTES];
- {
- decaf_ed448_prehash_ctx_t hash_too;
- memcpy(hash_too,hash,sizeof(hash_too));
- hash_final(hash_too,hash_output,sizeof(hash_output));
- hash_destroy(hash_too);
+ if (DECAF_SUCCESS != error) {
+ return error;
}
- decaf_ed448_sign(signature,privkey,pubkey,hash_output,sizeof(hash_output),1,context,context_len);
- decaf_bzero(hash_output,sizeof(hash_output));
-}
+ error =
+ curve448_point_decode_like_eddsa_and_mul_by_ratio(r_point, signature);
+ if (DECAF_SUCCESS != error) {
+ return error;
+ }
-decaf_error_t decaf_ed448_verify (
- const uint8_t signature[DECAF_EDDSA_448_SIGNATURE_BYTES],
- const uint8_t pubkey[DECAF_EDDSA_448_PUBLIC_BYTES],
- const uint8_t *message,
- size_t message_len,
- uint8_t prehashed,
- const uint8_t *context,
- uint8_t context_len
-) {
- API_NS(point_t) pk_point, r_point;
- decaf_error_t error = API_NS(point_decode_like_eddsa_and_mul_by_ratio)(pk_point,pubkey);
- if (DECAF_SUCCESS != error) { return error; }
-
- error = API_NS(point_decode_like_eddsa_and_mul_by_ratio)(r_point,signature);
- if (DECAF_SUCCESS != error) { return error; }
-
- API_NS(scalar_t) challenge_scalar;
{
/* Compute the challenge */
- hash_ctx_t hash;
- hash_init_with_dom(hash,prehashed,0,context,context_len);
- hash_update(hash,signature,DECAF_EDDSA_448_PUBLIC_BYTES);
- hash_update(hash,pubkey,DECAF_EDDSA_448_PUBLIC_BYTES);
- hash_update(hash,message,message_len);
- uint8_t challenge[2*DECAF_EDDSA_448_PRIVATE_BYTES];
- hash_final(hash,challenge,sizeof(challenge));
- hash_destroy(hash);
- API_NS(scalar_decode_long)(challenge_scalar,challenge,sizeof(challenge));
- decaf_bzero(challenge,sizeof(challenge));
+ EVP_MD_CTX *hashctx = EVP_MD_CTX_new();
+ uint8_t challenge[2 * DECAF_EDDSA_448_PRIVATE_BYTES];
+
+ if (hashctx == NULL
+ || !hash_init_with_dom(hashctx, prehashed, 0, context, context_len)
+ || !EVP_DigestUpdate(hashctx, signature,
+ DECAF_EDDSA_448_PUBLIC_BYTES)
+ || !EVP_DigestUpdate(hashctx, pubkey, DECAF_EDDSA_448_PUBLIC_BYTES)
+ || !EVP_DigestUpdate(hashctx, message, message_len)
+ || !EVP_DigestFinalXOF(hashctx, challenge, sizeof(challenge))) {
+ EVP_MD_CTX_free(hashctx);
+ return DECAF_FAILURE;
+ }
+
+ EVP_MD_CTX_free(hashctx);
+ curve448_scalar_decode_long(challenge_scalar, challenge,
+ sizeof(challenge));
+ OPENSSL_cleanse(challenge, sizeof(challenge));
}
- API_NS(scalar_sub)(challenge_scalar, API_NS(scalar_zero), challenge_scalar);
-
- API_NS(scalar_t) response_scalar;
- API_NS(scalar_decode_long)(
- response_scalar,
- &signature[DECAF_EDDSA_448_PUBLIC_BYTES],
- DECAF_EDDSA_448_PRIVATE_BYTES
- );
-
- for (unsigned c=1; c<DECAF_448_EDDSA_DECODE_RATIO; c<<=1) {
- API_NS(scalar_add)(response_scalar,response_scalar,response_scalar);
+ curve448_scalar_sub(challenge_scalar, curve448_scalar_zero,
+ challenge_scalar);
+
+ curve448_scalar_decode_long(response_scalar,
+ &signature[DECAF_EDDSA_448_PUBLIC_BYTES],
+ DECAF_EDDSA_448_PRIVATE_BYTES);
+
+ for (c = 1; c < DECAF_448_EDDSA_DECODE_RATIO; c <<= 1) {
+ curve448_scalar_add(response_scalar, response_scalar, response_scalar);
}
-
-
+
/* pk_point = -c(x(P)) + (cx + k)G = kG */
- API_NS(base_double_scalarmul_non_secret)(
- pk_point,
- response_scalar,
- pk_point,
- challenge_scalar
- );
- return decaf_succeed_if(API_NS(point_eq(pk_point,r_point)));
+ curve448_base_double_scalarmul_non_secret(pk_point,
+ response_scalar,
+ pk_point, challenge_scalar);
+ return decaf_succeed_if(curve448_point_eq(pk_point, r_point));
}
-
-decaf_error_t decaf_ed448_verify_prehash (
- const uint8_t signature[DECAF_EDDSA_448_SIGNATURE_BYTES],
- const uint8_t pubkey[DECAF_EDDSA_448_PUBLIC_BYTES],
- const decaf_ed448_prehash_ctx_t hash,
- const uint8_t *context,
- uint8_t context_len
-) {
+decaf_error_t decaf_ed448_verify_prehash(const uint8_t
+ signature
+ [DECAF_EDDSA_448_SIGNATURE_BYTES],
+ const uint8_t
+ pubkey[DECAF_EDDSA_448_PUBLIC_BYTES],
+ const uint8_t hash[64],
+ const uint8_t *context,
+ uint8_t context_len)
+{
decaf_error_t ret;
-
- uint8_t hash_output[EDDSA_PREHASH_BYTES];
- {
- decaf_ed448_prehash_ctx_t hash_too;
- memcpy(hash_too,hash,sizeof(hash_too));
- hash_final(hash_too,hash_output,sizeof(hash_output));
- hash_destroy(hash_too);
- }
-
- ret = decaf_ed448_verify(signature,pubkey,hash_output,sizeof(hash_output),1,context,context_len);
-
+
+ ret =
+ decaf_ed448_verify(signature, pubkey, hash, 64, 1, context,
+ context_len);
+
return ret;
}
+
+int ED448_sign(uint8_t *out_sig, const uint8_t *message, size_t message_len,
+ const uint8_t public_key[57], const uint8_t private_key[57],
+ const uint8_t *context, size_t context_len)
+{
+
+ return decaf_ed448_sign(out_sig, private_key, public_key, message,
+ message_len, 0, context, context_len)
+ == DECAF_SUCCESS;
+}
+
+int ED448_verify(const uint8_t *message, size_t message_len,
+ const uint8_t signature[114], const uint8_t public_key[57],
+ const uint8_t *context, size_t context_len)
+{
+ return decaf_ed448_verify(signature, public_key, message, message_len, 0,
+ context, context_len) == DECAF_SUCCESS;
+}
+
+int ED448ph_sign(uint8_t *out_sig, const uint8_t hash[64],
+ const uint8_t public_key[57], const uint8_t private_key[57],
+ const uint8_t *context, size_t context_len)
+{
+ return decaf_ed448_sign_prehash(out_sig, private_key, public_key, hash,
+ context, context_len) == DECAF_SUCCESS;
+
+}
+
+int ED448ph_verify(const uint8_t hash[64], const uint8_t signature[114],
+ const uint8_t public_key[57], const uint8_t *context,
+ size_t context_len)
+{
+ return decaf_ed448_verify_prehash(signature, public_key, hash, context,
+ context_len) == DECAF_SUCCESS;
+}
+
+int ED448_public_from_private(uint8_t out_public_key[57],
+ const uint8_t private_key[57])
+{
+ return decaf_ed448_derive_public_key(out_public_key, private_key)
+ == DECAF_SUCCESS;
+}
projects / openssl.git / blobdiff