Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2017, Google Inc. |
| 2 | * |
| 3 | * Permission to use, copy, modify, and/or distribute this software for any |
| 4 | * purpose with or without fee is hereby granted, provided that the above |
| 5 | * copyright notice and this permission notice appear in all copies. |
| 6 | * |
| 7 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 8 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 9 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 10 | * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 11 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| 12 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| 13 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ |
| 14 | |
| 15 | #include <openssl/evp.h> |
| 16 | |
| 17 | #include <openssl/curve25519.h> |
| 18 | #include <openssl/err.h> |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame^] | 19 | #include <openssl/mem.h> |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 20 | |
| 21 | #include "internal.h" |
| 22 | |
| 23 | |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 24 | // Ed25519 has no parameters to copy. |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 25 | static int pkey_ed25519_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { return 1; } |
| 26 | |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame^] | 27 | static int pkey_ed25519_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { |
| 28 | ED25519_KEY *key = OPENSSL_malloc(sizeof(ED25519_KEY)); |
| 29 | if (key == NULL) { |
| 30 | OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE); |
| 31 | return 0; |
| 32 | } |
| 33 | |
| 34 | if (!EVP_PKEY_set_type(pkey, EVP_PKEY_ED25519)) { |
| 35 | OPENSSL_free(key); |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | uint8_t pubkey_unused[32]; |
| 40 | ED25519_keypair(pubkey_unused, key->key.priv); |
| 41 | key->has_private = 1; |
| 42 | |
| 43 | OPENSSL_free(pkey->pkey.ptr); |
| 44 | pkey->pkey.ptr = key; |
| 45 | return 1; |
| 46 | } |
| 47 | |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 48 | static int pkey_ed25519_sign_message(EVP_PKEY_CTX *ctx, uint8_t *sig, |
| 49 | size_t *siglen, const uint8_t *tbs, |
| 50 | size_t tbslen) { |
| 51 | ED25519_KEY *key = ctx->pkey->pkey.ptr; |
| 52 | if (!key->has_private) { |
| 53 | OPENSSL_PUT_ERROR(EVP, EVP_R_NOT_A_PRIVATE_KEY); |
| 54 | return 0; |
| 55 | } |
| 56 | |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 57 | if (sig == NULL) { |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame^] | 58 | *siglen = 64; |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 59 | return 1; |
| 60 | } |
| 61 | |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame^] | 62 | if (*siglen < 64) { |
| 63 | OPENSSL_PUT_ERROR(EVP, EVP_R_BUFFER_TOO_SMALL); |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | if (!ED25519_sign(sig, tbs, tbslen, key->key.priv)) { |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | *siglen = 64; |
| 72 | return 1; |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | static int pkey_ed25519_verify_message(EVP_PKEY_CTX *ctx, const uint8_t *sig, |
| 76 | size_t siglen, const uint8_t *tbs, |
| 77 | size_t tbslen) { |
| 78 | ED25519_KEY *key = ctx->pkey->pkey.ptr; |
| 79 | if (siglen != 64 || |
| 80 | !ED25519_verify(tbs, tbslen, sig, key->key.pub.value)) { |
| 81 | OPENSSL_PUT_ERROR(EVP, EVP_R_INVALID_SIGNATURE); |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | return 1; |
| 86 | } |
| 87 | |
| 88 | const EVP_PKEY_METHOD ed25519_pkey_meth = { |
| 89 | EVP_PKEY_ED25519, |
| 90 | NULL /* init */, |
| 91 | pkey_ed25519_copy, |
| 92 | NULL /* cleanup */, |
Pete Bentley | 0c61efe | 2019-08-13 09:32:23 +0100 | [diff] [blame^] | 93 | pkey_ed25519_keygen, |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 94 | NULL /* sign */, |
| 95 | pkey_ed25519_sign_message, |
| 96 | NULL /* verify */, |
| 97 | pkey_ed25519_verify_message, |
| 98 | NULL /* verify_recover */, |
| 99 | NULL /* encrypt */, |
| 100 | NULL /* decrypt */, |
| 101 | NULL /* derive */, |
Robert Sloan | 4c22c5f | 2019-03-01 15:53:37 -0800 | [diff] [blame] | 102 | NULL /* paramgen */, |
Robert Sloan | 572a4e2 | 2017-04-17 10:52:19 -0700 | [diff] [blame] | 103 | NULL /* ctrl */, |
| 104 | }; |