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)
29 typedef size_t (*aeswrap_fn)(void *key, const unsigned char *iv,
30 unsigned char *out, const unsigned char *in,
31 size_t inlen, block128_f block);
33 static OSSL_FUNC_cipher_encrypt_init_fn aes_wrap_einit;
34 static OSSL_FUNC_cipher_decrypt_init_fn aes_wrap_dinit;
35 static OSSL_FUNC_cipher_update_fn aes_wrap_cipher;
36 static OSSL_FUNC_cipher_final_fn aes_wrap_final;
37 static OSSL_FUNC_cipher_freectx_fn aes_wrap_freectx;
39 typedef struct prov_aes_wrap_ctx_st {
50 static void *aes_wrap_newctx(size_t kbits, size_t blkbits,
51 size_t ivbits, unsigned int mode, uint64_t flags)
53 PROV_AES_WRAP_CTX *wctx;
56 if (!ossl_prov_is_running())
59 wctx = OPENSSL_zalloc(sizeof(*wctx));
60 ctx = (PROV_CIPHER_CTX *)wctx;
62 ossl_cipher_generic_initkey(ctx, kbits, blkbits, ivbits, mode, flags,
64 ctx->pad = (ctx->ivlen == AES_WRAP_PAD_IVLEN);
69 static void aes_wrap_freectx(void *vctx)
71 PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
73 ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
74 OPENSSL_clear_free(wctx, sizeof(*wctx));
77 static int aes_wrap_init(void *vctx, const unsigned char *key,
78 size_t keylen, const unsigned char *iv,
79 size_t ivlen, int enc)
81 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
82 PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
84 if (!ossl_prov_is_running())
88 ctx->block = enc ? (block128_f)AES_encrypt : (block128_f)AES_decrypt;
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 if (keylen != ctx->keylen) {
100 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
104 AES_set_encrypt_key(key, keylen * 8, &wctx->ks.ks);
106 AES_set_decrypt_key(key, keylen * 8, &wctx->ks.ks);
111 static int aes_wrap_einit(void *ctx, const unsigned char *key, size_t keylen,
112 const unsigned char *iv, size_t ivlen)
114 return aes_wrap_init(ctx, key, keylen, iv, ivlen, 1);
117 static int aes_wrap_dinit(void *ctx, const unsigned char *key, size_t keylen,
118 const unsigned char *iv, size_t ivlen)
120 return aes_wrap_init(ctx, key, keylen, iv, ivlen, 0);
123 static int aes_wrap_cipher_internal(void *vctx, unsigned char *out,
124 const unsigned char *in, size_t inlen)
126 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
127 PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
131 /* No final operation so always return zero length */
135 /* Input length must always be non-zero */
139 /* If decrypting need at least 16 bytes and multiple of 8 */
140 if (!ctx->enc && (inlen < 16 || inlen & 0x7))
143 /* If not padding input must be multiple of 8 */
144 if (!pad && inlen & 0x7)
149 /* If padding round up to multiple of 8 */
151 inlen = (inlen + 7) / 8 * 8;
156 * If not padding output will be exactly 8 bytes smaller than
157 * input. If padding it will be at least 8 bytes smaller but we
158 * don't know how much.
164 rv = wctx->wrapfn(&wctx->ks.ks, ctx->iv_set ? ctx->iv : NULL, out, in,
166 return rv ? (int)rv : -1;
169 static int aes_wrap_final(void *vctx, unsigned char *out, size_t *outl,
172 if (!ossl_prov_is_running())
179 static int aes_wrap_cipher(void *vctx,
180 unsigned char *out, size_t *outl, size_t outsize,
181 const unsigned char *in, size_t inl)
183 PROV_AES_WRAP_CTX *ctx = (PROV_AES_WRAP_CTX *)vctx;
186 if (!ossl_prov_is_running())
195 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
199 len = aes_wrap_cipher_internal(ctx, out, in, inl);
207 static int aes_wrap_set_ctx_params(void *vctx, const OSSL_PARAM params[])
209 PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
213 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
215 if (!OSSL_PARAM_get_size_t(p, &keylen)) {
216 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
219 if (ctx->keylen != keylen) {
220 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
227 #define IMPLEMENT_cipher(mode, fname, UCMODE, flags, kbits, blkbits, ivbits) \
228 static OSSL_FUNC_cipher_get_params_fn aes_##kbits##_##fname##_get_params; \
229 static int aes_##kbits##_##fname##_get_params(OSSL_PARAM params[]) \
231 return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE,\
232 flags, kbits, blkbits, ivbits); \
234 static OSSL_FUNC_cipher_newctx_fn aes_##kbits##fname##_newctx; \
235 static void *aes_##kbits##fname##_newctx(void *provctx) \
237 return aes_##mode##_newctx(kbits, blkbits, ivbits, \
238 EVP_CIPH_##UCMODE##_MODE, flags); \
240 const OSSL_DISPATCH ossl_##aes##kbits##fname##_functions[] = { \
241 { OSSL_FUNC_CIPHER_NEWCTX, \
242 (void (*)(void))aes_##kbits##fname##_newctx }, \
243 { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_##mode##_einit }, \
244 { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_##mode##_dinit }, \
245 { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_##mode##_cipher }, \
246 { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_##mode##_final }, \
247 { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_##mode##_freectx }, \
248 { OSSL_FUNC_CIPHER_GET_PARAMS, \
249 (void (*)(void))aes_##kbits##_##fname##_get_params }, \
250 { OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
251 (void (*)(void))ossl_cipher_generic_gettable_params }, \
252 { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
253 (void (*)(void))ossl_cipher_generic_get_ctx_params }, \
254 { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
255 (void (*)(void))aes_wrap_set_ctx_params }, \
256 { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
257 (void (*)(void))ossl_cipher_generic_gettable_ctx_params }, \
258 { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
259 (void (*)(void))ossl_cipher_generic_settable_ctx_params }, \
263 IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_NOPAD_IVLEN * 8);
264 IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_NOPAD_IVLEN * 8);
265 IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_NOPAD_IVLEN * 8);
266 IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_PAD_IVLEN * 8);
267 IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_PAD_IVLEN * 8);
268 IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_PAD_IVLEN * 8);