1 /* 2 * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (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 8 */ 9 10 /* 11 * This file uses the low level AES functions (which are deprecated for 12 * non-internal use) in order to implement provider AES ciphers. 13 */ 14 #include "internal/deprecated.h" 15 16 #include "cipher_aes_siv.h" 17 18 static void aes_siv_cleanup(void *vctx); 19 20 static int aes_siv_initkey(void *vctx, const unsigned char *key, size_t keylen) 21 { 22 PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx; 23 SIV128_CONTEXT *sctx = &ctx->siv; 24 size_t klen = keylen / 2; 25 OSSL_LIB_CTX *libctx = ctx->libctx; 26 const char *propq = NULL; 27 28 EVP_CIPHER_free(ctx->cbc); 29 EVP_CIPHER_free(ctx->ctr); 30 ctx->cbc = NULL; 31 ctx->ctr = NULL; 32 33 switch (klen) { 34 case 16: 35 ctx->cbc = EVP_CIPHER_fetch(libctx, "AES-128-CBC", propq); 36 ctx->ctr = EVP_CIPHER_fetch(libctx, "AES-128-CTR", propq); 37 break; 38 case 24: 39 ctx->cbc = EVP_CIPHER_fetch(libctx, "AES-192-CBC", propq); 40 ctx->ctr = EVP_CIPHER_fetch(libctx, "AES-192-CTR", propq); 41 break; 42 case 32: 43 ctx->cbc = EVP_CIPHER_fetch(libctx, "AES-256-CBC", propq); 44 ctx->ctr = EVP_CIPHER_fetch(libctx, "AES-256-CTR", propq); 45 break; 46 default: 47 break; 48 } 49 if (ctx->cbc == NULL || ctx->ctr == NULL) 50 return 0; 51 /* 52 * klen is the length of the underlying cipher, not the input key, 53 * which should be twice as long 54 */ 55 return ossl_siv128_init(sctx, key, klen, ctx->cbc, ctx->ctr, libctx, 56 propq); 57 } 58 59 static int aes_siv_dupctx(void *in_vctx, void *out_vctx) 60 { 61 PROV_AES_SIV_CTX *in = (PROV_AES_SIV_CTX *)in_vctx; 62 PROV_AES_SIV_CTX *out = (PROV_AES_SIV_CTX *)out_vctx; 63 64 *out = *in; 65 out->siv.cipher_ctx = NULL; 66 out->siv.mac_ctx_init = NULL; 67 out->siv.mac = NULL; 68 if (!ossl_siv128_copy_ctx(&out->siv, &in->siv)) 69 return 0; 70 if (out->cbc != NULL) 71 EVP_CIPHER_up_ref(out->cbc); 72 if (out->ctr != NULL) 73 EVP_CIPHER_up_ref(out->ctr); 74 return 1; 75 } 76 77 static int aes_siv_settag(void *vctx, const unsigned char *tag, size_t tagl) 78 { 79 PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx; 80 SIV128_CONTEXT *sctx = &ctx->siv; 81 82 return ossl_siv128_set_tag(sctx, tag, tagl); 83 } 84 85 static void aes_siv_setspeed(void *vctx, int speed) 86 { 87 PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx; 88 SIV128_CONTEXT *sctx = &ctx->siv; 89 90 ossl_siv128_speed(sctx, (int)speed); 91 } 92 93 static void aes_siv_cleanup(void *vctx) 94 { 95 PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx; 96 SIV128_CONTEXT *sctx = &ctx->siv; 97 98 ossl_siv128_cleanup(sctx); 99 EVP_CIPHER_free(ctx->cbc); 100 EVP_CIPHER_free(ctx->ctr); 101 } 102 103 static int aes_siv_cipher(void *vctx, unsigned char *out, 104 const unsigned char *in, size_t len) 105 { 106 PROV_AES_SIV_CTX *ctx = (PROV_AES_SIV_CTX *)vctx; 107 SIV128_CONTEXT *sctx = &ctx->siv; 108 109 /* EncryptFinal or DecryptFinal */ 110 if (in == NULL) 111 return ossl_siv128_finish(sctx) == 0; 112 113 /* Deal with associated data */ 114 if (out == NULL) 115 return (ossl_siv128_aad(sctx, in, len) == 1); 116 117 if (ctx->enc) 118 return ossl_siv128_encrypt(sctx, in, out, len) > 0; 119 120 return ossl_siv128_decrypt(sctx, in, out, len) > 0; 121 } 122 123 static const PROV_CIPHER_HW_AES_SIV aes_siv_hw = 124 { 125 aes_siv_initkey, 126 aes_siv_cipher, 127 aes_siv_setspeed, 128 aes_siv_settag, 129 aes_siv_cleanup, 130 aes_siv_dupctx, 131 }; 132 133 const PROV_CIPHER_HW_AES_SIV *ossl_prov_cipher_hw_aes_siv(size_t keybits) 134 { 135 return &aes_siv_hw; 136 } 137