2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "internal/cryptlib.h"
12 #include <openssl/x509.h>
13 #include <openssl/ec.h>
14 #include <openssl/rand.h>
15 #include "internal/asn1_int.h"
16 #include "internal/evp_int.h"
19 #define X25519_KEYLEN 32
20 #define X25519_BITS 253
21 #define X25519_SECURITY_BITS 128
23 #define ED25519_SIGSIZE 64
26 unsigned char pubkey[X25519_KEYLEN];
27 unsigned char *privkey;
36 /* Setup EVP_PKEY using public, private or generation */
37 static int ecx_key_op(EVP_PKEY *pkey, int id, const X509_ALGOR *palg,
38 const unsigned char *p, int plen, ecx_key_op_t op)
42 if (op != X25519_KEYGEN) {
46 /* Algorithm parameters must be absent */
47 X509_ALGOR_get0(NULL, &ptype, NULL, palg);
48 if (ptype != V_ASN1_UNDEF) {
49 ECerr(EC_F_ECX_KEY_OP, EC_R_INVALID_ENCODING);
54 if (p == NULL || plen != X25519_KEYLEN) {
55 ECerr(EC_F_ECX_KEY_OP, EC_R_INVALID_ENCODING);
60 xkey = OPENSSL_zalloc(sizeof(*xkey));
62 ECerr(EC_F_ECX_KEY_OP, ERR_R_MALLOC_FAILURE);
66 if (op == X25519_PUBLIC) {
67 memcpy(xkey->pubkey, p, plen);
69 xkey->privkey = OPENSSL_secure_malloc(X25519_KEYLEN);
70 if (xkey->privkey == NULL) {
71 ECerr(EC_F_ECX_KEY_OP, ERR_R_MALLOC_FAILURE);
75 if (op == X25519_KEYGEN) {
76 if (RAND_bytes(xkey->privkey, X25519_KEYLEN) <= 0) {
77 OPENSSL_secure_free(xkey->privkey);
81 if (id == NID_X25519) {
82 xkey->privkey[0] &= 248;
83 xkey->privkey[31] &= 127;
84 xkey->privkey[31] |= 64;
87 memcpy(xkey->privkey, p, X25519_KEYLEN);
90 X25519_public_from_private(xkey->pubkey, xkey->privkey);
92 ED25519_public_from_private(xkey->pubkey, xkey->privkey);
95 EVP_PKEY_assign(pkey, id, xkey);
99 static int ecx_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
101 const X25519_KEY *xkey = pkey->pkey.ptr;
105 ECerr(EC_F_ECX_PUB_ENCODE, EC_R_INVALID_KEY);
109 penc = OPENSSL_memdup(xkey->pubkey, X25519_KEYLEN);
111 ECerr(EC_F_ECX_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
115 if (!X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
116 V_ASN1_UNDEF, NULL, penc, X25519_KEYLEN)) {
118 ECerr(EC_F_ECX_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
124 static int ecx_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
126 const unsigned char *p;
130 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
132 return ecx_key_op(pkey, pkey->ameth->pkey_id, palg, p, pklen,
136 static int ecx_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
138 const X25519_KEY *akey = a->pkey.ptr;
139 const X25519_KEY *bkey = b->pkey.ptr;
141 if (akey == NULL || bkey == NULL)
143 return !CRYPTO_memcmp(akey->pubkey, bkey->pubkey, X25519_KEYLEN);
146 static int ecx_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
148 const unsigned char *p;
150 ASN1_OCTET_STRING *oct = NULL;
151 const X509_ALGOR *palg;
154 if (!PKCS8_pkey_get0(NULL, &p, &plen, &palg, p8))
157 oct = d2i_ASN1_OCTET_STRING(NULL, &p, plen);
162 p = ASN1_STRING_get0_data(oct);
163 plen = ASN1_STRING_length(oct);
166 rv = ecx_key_op(pkey, pkey->ameth->pkey_id, palg, p, plen, X25519_PRIVATE);
167 ASN1_OCTET_STRING_free(oct);
171 static int ecx_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
173 const X25519_KEY *xkey = pkey->pkey.ptr;
174 ASN1_OCTET_STRING oct;
175 unsigned char *penc = NULL;
178 if (xkey == NULL || xkey->privkey == NULL) {
179 ECerr(EC_F_ECX_PRIV_ENCODE, EC_R_INVALID_PRIVATE_KEY);
183 oct.data = xkey->privkey;
184 oct.length = X25519_KEYLEN;
187 penclen = i2d_ASN1_OCTET_STRING(&oct, &penc);
189 ECerr(EC_F_ECX_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
193 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
194 V_ASN1_UNDEF, NULL, penc, penclen)) {
195 OPENSSL_clear_free(penc, penclen);
196 ECerr(EC_F_ECX_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
203 static int ecx_size(const EVP_PKEY *pkey)
205 return X25519_KEYLEN;
208 static int ecx_bits(const EVP_PKEY *pkey)
213 static int ecx_security_bits(const EVP_PKEY *pkey)
215 return X25519_SECURITY_BITS;
218 static void ecx_free(EVP_PKEY *pkey)
220 X25519_KEY *xkey = pkey->pkey.ptr;
223 OPENSSL_secure_free(xkey->privkey);
227 /* "parameters" are always equal */
228 static int ecx_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
233 static int ecx_key_print(BIO *bp, const EVP_PKEY *pkey, int indent,
234 ASN1_PCTX *ctx, ecx_key_op_t op)
236 const X25519_KEY *xkey = pkey->pkey.ptr;
238 const char *nm = OBJ_nid2ln(pkey->ameth->pkey_id);
240 if (op == X25519_PRIVATE) {
241 if (xkey == NULL || xkey->privkey == NULL) {
242 if (BIO_printf(bp, "%*s<INVALID PRIVATE KEY>\n", indent, "") <= 0)
246 if (BIO_printf(bp, "%*s%s Private-Key:\n", indent, "", nm) <= 0)
248 if (BIO_printf(bp, "%*spriv:\n", indent, "") <= 0)
250 if (ASN1_buf_print(bp, xkey->privkey, X25519_KEYLEN, indent + 4) == 0)
254 if (BIO_printf(bp, "%*s<INVALID PUBLIC KEY>\n", indent, "") <= 0)
258 if (BIO_printf(bp, "%*s%s Public-Key:\n", indent, "", nm) <= 0)
261 if (BIO_printf(bp, "%*spub:\n", indent, "") <= 0)
263 if (ASN1_buf_print(bp, xkey->pubkey, X25519_KEYLEN, indent + 4) == 0)
268 static int ecx_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
271 return ecx_key_print(bp, pkey, indent, ctx, X25519_PRIVATE);
274 static int ecx_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
277 return ecx_key_print(bp, pkey, indent, ctx, X25519_PUBLIC);
280 static int ecx_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
284 case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
285 return ecx_key_op(pkey, NID_X25519, NULL, arg2, arg1, X25519_PUBLIC);
287 case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
288 if (pkey->pkey.ptr != NULL) {
289 const X25519_KEY *xkey = pkey->pkey.ptr;
290 unsigned char **ppt = arg2;
291 *ppt = OPENSSL_memdup(xkey->pubkey, X25519_KEYLEN);
293 return X25519_KEYLEN;
297 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
298 *(int *)arg2 = NID_sha256;
307 const EVP_PKEY_ASN1_METHOD ecx25519_asn1_meth = {
312 "OpenSSL X25519 algorithm",
337 static int ecd_size(const EVP_PKEY *pkey)
339 return ED25519_SIGSIZE;
342 static int ecd_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
343 X509_ALGOR *sigalg, ASN1_BIT_STRING *str,
346 const ASN1_OBJECT *obj;
349 X509_ALGOR_get0(&obj, &ptype, NULL, sigalg);
350 /* Sanity check: make sure it is ED25519 with absent parameters */
351 if (OBJ_obj2nid(obj) != NID_ED25519 || ptype != V_ASN1_UNDEF) {
352 ECerr(EC_F_ECD_ITEM_VERIFY, EC_R_INVALID_ENCODING);
356 if (!EVP_DigestVerifyInit(ctx, NULL, NULL, NULL, pkey))
362 static int ecd_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
363 X509_ALGOR *alg1, X509_ALGOR *alg2,
364 ASN1_BIT_STRING *str)
366 /* Set algorithms identifiers */
367 X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_ED25519), V_ASN1_UNDEF, NULL);
369 X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_ED25519), V_ASN1_UNDEF, NULL);
370 /* Algorithm idetifiers set: carry on as normal */
374 static int ecd_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *alg,
375 const ASN1_STRING *sig)
377 X509_SIG_INFO_set(siginf, NID_undef, NID_ED25519, X25519_SECURITY_BITS,
382 const EVP_PKEY_ASN1_METHOD ed25519_asn1_meth = {
387 "OpenSSL ED25519 algorithm",
415 static int pkey_ecx_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
417 return ecx_key_op(pkey, ctx->pmeth->pkey_id, NULL, NULL, 0, X25519_KEYGEN);
420 static int pkey_ecx_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
423 const X25519_KEY *pkey, *peerkey;
425 if (ctx->pkey == NULL || ctx->peerkey == NULL) {
426 ECerr(EC_F_PKEY_ECX_DERIVE, EC_R_KEYS_NOT_SET);
429 pkey = ctx->pkey->pkey.ptr;
430 peerkey = ctx->peerkey->pkey.ptr;
431 if (pkey == NULL || pkey->privkey == NULL) {
432 ECerr(EC_F_PKEY_ECX_DERIVE, EC_R_INVALID_PRIVATE_KEY);
435 if (peerkey == NULL) {
436 ECerr(EC_F_PKEY_ECX_DERIVE, EC_R_INVALID_PEER_KEY);
439 *keylen = X25519_KEYLEN;
440 if (key != NULL && X25519(key, pkey->privkey, peerkey->pubkey) == 0)
445 static int pkey_ecx_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
447 /* Only need to handle peer key for derivation */
448 if (type == EVP_PKEY_CTRL_PEER_KEY)
453 const EVP_PKEY_METHOD ecx25519_pkey_meth = {
457 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
463 static int pkey_ecd_digestsign(EVP_MD_CTX *ctx, unsigned char *sig,
464 size_t *siglen, const unsigned char *tbs,
467 const X25519_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ptr;
470 *siglen = ED25519_SIGSIZE;
473 if (*siglen < ED25519_SIGSIZE) {
474 ECerr(EC_F_PKEY_ECD_DIGESTSIGN, EC_R_BUFFER_TOO_SMALL);
478 if (ED25519_sign(sig, tbs, tbslen, edkey->pubkey, edkey->privkey) == 0)
480 *siglen = ED25519_SIGSIZE;
484 static int pkey_ecd_digestverify(EVP_MD_CTX *ctx, const unsigned char *sig,
485 size_t siglen, const unsigned char *tbs,
488 const X25519_KEY *edkey = EVP_MD_CTX_pkey_ctx(ctx)->pkey->pkey.ptr;
490 if (siglen != ED25519_SIGSIZE)
493 return ED25519_verify(tbs, tbslen, sig, edkey->pubkey);
496 static int pkey_ecd_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
499 case EVP_PKEY_CTRL_MD:
500 /* Only NULL allowed as digest */
503 ECerr(EC_F_PKEY_ECD_CTRL, EC_R_INVALID_DIGEST_TYPE);
506 case EVP_PKEY_CTRL_DIGESTINIT:
512 const EVP_PKEY_METHOD ed25519_pkey_meth = {
513 NID_ED25519, EVP_PKEY_FLAG_SIGCTX_CUSTOM,
516 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
520 pkey_ecd_digestverify