2 * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
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
11 * This file uses the low level AES functions (which are deprecated for
12 * non-internal use) in order to implement provider AES ciphers.
14 #include "internal/deprecated.h"
16 #include "cipher_aes.h"
17 #include "prov/providercommon.h"
18 #include "prov/providercommonerr.h"
19 #include "prov/implementations.h"
21 /* AES wrap with padding has IV length of 4, without padding 8 */
22 #define AES_WRAP_PAD_IVLEN 4
23 #define AES_WRAP_NOPAD_IVLEN 8
25 /* TODO(3.0) Figure out what flags need to be passed */
26 #define WRAP_FLAGS (EVP_CIPH_WRAP_MODE | EVP_CIPH_CUSTOM_IV \
27 | EVP_CIPH_ALWAYS_CALL_INIT)
28 #define WRAP_FLAGS_INV (WRAP_FLAGS | EVP_CIPH_FLAG_INVERSE_CIPHER)
30 typedef size_t (*aeswrap_fn)(void *key, const unsigned char *iv,
31 unsigned char *out, const unsigned char *in,
32 size_t inlen, block128_f block);
34 static OSSL_FUNC_cipher_encrypt_init_fn aes_wrap_einit;
35 static OSSL_FUNC_cipher_decrypt_init_fn aes_wrap_dinit;
36 static OSSL_FUNC_cipher_update_fn aes_wrap_cipher;
37 static OSSL_FUNC_cipher_final_fn aes_wrap_final;
38 static OSSL_FUNC_cipher_freectx_fn aes_wrap_freectx;
40 typedef struct prov_aes_wrap_ctx_st {
51 static void *aes_wrap_newctx(size_t kbits, size_t blkbits,
52 size_t ivbits, unsigned int mode, uint64_t flags)
54 PROV_AES_WRAP_CTX *wctx;
57 if (!ossl_prov_is_running())
60 wctx = OPENSSL_zalloc(sizeof(*wctx));
61 ctx = (PROV_CIPHER_CTX *)wctx;
63 ossl_cipher_generic_initkey(ctx, kbits, blkbits, ivbits, mode, flags,
65 ctx->pad = (ctx->ivlen == AES_WRAP_PAD_IVLEN);
70 static void aes_wrap_freectx(void *vctx)
72 PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
74 ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
75 OPENSSL_clear_free(wctx, sizeof(*wctx));
78 static int aes_wrap_init(void *vctx, const unsigned char *key,
79 size_t keylen, const unsigned char *iv,
80 size_t ivlen, int enc)
82 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
83 PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
85 if (!ossl_prov_is_running())
90 wctx->wrapfn = enc ? CRYPTO_128_wrap_pad : CRYPTO_128_unwrap_pad;
92 wctx->wrapfn = enc ? CRYPTO_128_wrap : CRYPTO_128_unwrap;
95 if (!ossl_cipher_generic_initiv(ctx, iv, ivlen))
99 int use_forward_transform;
101 if (keylen != ctx->keylen) {
102 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
106 * See SP800-38F : Section 5.1
107 * The forward and inverse transformations for the AES block
108 * cipher—called “cipher” and “inverse cipher” are informally known as
109 * the AES encryption and AES decryption functions, respectively.
110 * If the designated cipher function for a key-wrap algorithm is chosen
111 * to be the AES decryption function, then CIPH-1K will be the AES
112 * encryption function.
114 if ((ctx->flags & EVP_CIPH_FLAG_INVERSE_CIPHER) == 0)
115 use_forward_transform = ctx->enc;
117 use_forward_transform = !ctx->enc;
118 if (use_forward_transform) {
119 AES_set_encrypt_key(key, keylen * 8, &wctx->ks.ks);
120 ctx->block = (block128_f)AES_encrypt;
122 AES_set_decrypt_key(key, keylen * 8, &wctx->ks.ks);
123 ctx->block = (block128_f)AES_decrypt;
129 static int aes_wrap_einit(void *ctx, const unsigned char *key, size_t keylen,
130 const unsigned char *iv, size_t ivlen)
132 return aes_wrap_init(ctx, key, keylen, iv, ivlen, 1);
135 static int aes_wrap_dinit(void *ctx, const unsigned char *key, size_t keylen,
136 const unsigned char *iv, size_t ivlen)
138 return aes_wrap_init(ctx, key, keylen, iv, ivlen, 0);
141 static int aes_wrap_cipher_internal(void *vctx, unsigned char *out,
142 const unsigned char *in, size_t inlen)
144 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
145 PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
149 /* No final operation so always return zero length */
153 /* Input length must always be non-zero */
157 /* If decrypting need at least 16 bytes and multiple of 8 */
158 if (!ctx->enc && (inlen < 16 || inlen & 0x7))
161 /* If not padding input must be multiple of 8 */
162 if (!pad && inlen & 0x7)
167 /* If padding round up to multiple of 8 */
169 inlen = (inlen + 7) / 8 * 8;
174 * If not padding output will be exactly 8 bytes smaller than
175 * input. If padding it will be at least 8 bytes smaller but we
176 * don't know how much.
182 rv = wctx->wrapfn(&wctx->ks.ks, ctx->iv_set ? ctx->iv : NULL, out, in,
184 return rv ? (int)rv : -1;
187 static int aes_wrap_final(void *vctx, unsigned char *out, size_t *outl,
190 if (!ossl_prov_is_running())
197 static int aes_wrap_cipher(void *vctx,
198 unsigned char *out, size_t *outl, size_t outsize,
199 const unsigned char *in, size_t inl)
201 PROV_AES_WRAP_CTX *ctx = (PROV_AES_WRAP_CTX *)vctx;
204 if (!ossl_prov_is_running())
213 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
217 len = aes_wrap_cipher_internal(ctx, out, in, inl);
225 static int aes_wrap_set_ctx_params(void *vctx, const OSSL_PARAM params[])
227 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
231 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
233 if (!OSSL_PARAM_get_size_t(p, &keylen)) {
234 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
237 if (ctx->keylen != keylen) {
238 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
245 #define IMPLEMENT_cipher(mode, fname, UCMODE, flags, kbits, blkbits, ivbits) \
246 static OSSL_FUNC_cipher_get_params_fn aes_##kbits##_##fname##_get_params; \
247 static int aes_##kbits##_##fname##_get_params(OSSL_PARAM params[]) \
249 return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE,\
250 flags, kbits, blkbits, ivbits); \
252 static OSSL_FUNC_cipher_newctx_fn aes_##kbits##fname##_newctx; \
253 static void *aes_##kbits##fname##_newctx(void *provctx) \
255 return aes_##mode##_newctx(kbits, blkbits, ivbits, \
256 EVP_CIPH_##UCMODE##_MODE, flags); \
258 const OSSL_DISPATCH ossl_##aes##kbits##fname##_functions[] = { \
259 { OSSL_FUNC_CIPHER_NEWCTX, \
260 (void (*)(void))aes_##kbits##fname##_newctx }, \
261 { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_##mode##_einit }, \
262 { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_##mode##_dinit }, \
263 { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_##mode##_cipher }, \
264 { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_##mode##_final }, \
265 { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_##mode##_freectx }, \
266 { OSSL_FUNC_CIPHER_GET_PARAMS, \
267 (void (*)(void))aes_##kbits##_##fname##_get_params }, \
268 { OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
269 (void (*)(void))ossl_cipher_generic_gettable_params }, \
270 { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
271 (void (*)(void))ossl_cipher_generic_get_ctx_params }, \
272 { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
273 (void (*)(void))aes_wrap_set_ctx_params }, \
274 { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
275 (void (*)(void))ossl_cipher_generic_gettable_ctx_params }, \
276 { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
277 (void (*)(void))ossl_cipher_generic_settable_ctx_params }, \
281 IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_NOPAD_IVLEN * 8);
282 IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_NOPAD_IVLEN * 8);
283 IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_NOPAD_IVLEN * 8);
284 IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_PAD_IVLEN * 8);
285 IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_PAD_IVLEN * 8);
286 IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_PAD_IVLEN * 8);
288 IMPLEMENT_cipher(wrap, wrapinv, WRAP, WRAP_FLAGS_INV, 256, 64, AES_WRAP_NOPAD_IVLEN * 8);
289 IMPLEMENT_cipher(wrap, wrapinv, WRAP, WRAP_FLAGS_INV, 192, 64, AES_WRAP_NOPAD_IVLEN * 8);
290 IMPLEMENT_cipher(wrap, wrapinv, WRAP, WRAP_FLAGS_INV, 128, 64, AES_WRAP_NOPAD_IVLEN * 8);
291 IMPLEMENT_cipher(wrap, wrappadinv, WRAP, WRAP_FLAGS_INV, 256, 64, AES_WRAP_PAD_IVLEN * 8);
292 IMPLEMENT_cipher(wrap, wrappadinv, WRAP, WRAP_FLAGS_INV, 192, 64, AES_WRAP_PAD_IVLEN * 8);
293 IMPLEMENT_cipher(wrap, wrappadinv, WRAP, WRAP_FLAGS_INV, 128, 64, AES_WRAP_PAD_IVLEN * 8);