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
10 /* Dispatch functions for ccm mode */
12 #include "prov/ciphercommon.h"
13 #include "prov/ciphercommon_ccm.h"
14 #include "prov/providercommonerr.h"
16 static int ccm_cipher_internal(PROV_CCM_CTX *ctx, unsigned char *out,
17 size_t *padlen, const unsigned char *in,
20 static int ccm_tls_init(PROV_CCM_CTX *ctx, unsigned char *aad, size_t alen)
24 if (alen != EVP_AEAD_TLS1_AAD_LEN)
27 /* Save the aad for later use. */
28 memcpy(ctx->buf, aad, alen);
29 ctx->tls_aad_len = alen;
31 len = ctx->buf[alen - 2] << 8 | ctx->buf[alen - 1];
32 if (len < EVP_CCM_TLS_EXPLICIT_IV_LEN)
35 /* Correct length for explicit iv. */
36 len -= EVP_CCM_TLS_EXPLICIT_IV_LEN;
41 /* Correct length for tag. */
44 ctx->buf[alen - 2] = (unsigned char)(len >> 8);
45 ctx->buf[alen - 1] = (unsigned char)(len & 0xff);
47 /* Extra padding: tag appended to record. */
51 static int ccm_tls_iv_set_fixed(PROV_CCM_CTX *ctx, unsigned char *fixed,
54 if (flen != EVP_CCM_TLS_FIXED_IV_LEN)
57 /* Copy to first part of the iv. */
58 memcpy(ctx->iv, fixed, flen);
62 static size_t ccm_get_ivlen(PROV_CCM_CTX *ctx)
67 int ccm_set_ctx_params(void *vctx, const OSSL_PARAM params[])
69 PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
73 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TAG);
75 if (p->data_type != OSSL_PARAM_OCTET_STRING) {
76 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
79 if ((p->data_size & 1) || (p->data_size < 4) || p->data_size > 16) {
80 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAGLEN);
84 if (p->data != NULL) {
86 ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_NEEDED);
89 memcpy(ctx->buf, p->data, p->data_size);
92 ctx->m = p->data_size;
95 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_IVLEN);
99 if (!OSSL_PARAM_get_size_t(p, &sz)) {
100 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
104 if (ivlen < 2 || ivlen > 8) {
105 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN);
111 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD);
113 if (p->data_type != OSSL_PARAM_OCTET_STRING) {
114 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
117 sz = ccm_tls_init(ctx, p->data, p->data_size);
119 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DATA);
122 ctx->tls_aad_pad_sz = sz;
125 p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED);
127 if (p->data_type != OSSL_PARAM_OCTET_STRING) {
128 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
131 if (ccm_tls_iv_set_fixed(ctx, p->data, p->data_size) == 0) {
132 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN);
140 int ccm_get_ctx_params(void *vctx, OSSL_PARAM params[])
142 PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
145 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
146 if (p != NULL && !OSSL_PARAM_set_size_t(p, ccm_get_ivlen(ctx))) {
147 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
151 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAGLEN);
155 if (!OSSL_PARAM_set_size_t(p, m)) {
156 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
161 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IV);
163 if (ccm_get_ivlen(ctx) > p->data_size) {
164 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN);
167 if (!OSSL_PARAM_set_octet_string(p, ctx->iv, p->data_size)
168 && !OSSL_PARAM_set_octet_ptr(p, &ctx->iv, p->data_size)) {
169 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
174 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
175 if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->keylen)) {
176 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
180 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD);
181 if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tls_aad_pad_sz)) {
182 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
186 p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAG);
188 if (!ctx->enc || !ctx->tag_set) {
189 ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOTSET);
192 if (p->data_type != OSSL_PARAM_OCTET_STRING) {
193 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
196 if (!ctx->hw->gettag(ctx, p->data, p->data_size))
205 static int ccm_init(void *vctx, const unsigned char *key, size_t keylen,
206 const unsigned char *iv, size_t ivlen, int enc)
208 PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
213 if (ivlen != ccm_get_ivlen(ctx)) {
214 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN);
217 memcpy(ctx->iv, iv, ivlen);
221 if (keylen != ctx->keylen) {
222 ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEYLEN);
225 return ctx->hw->setkey(ctx, key, keylen);
230 int ccm_einit(void *vctx, const unsigned char *key, size_t keylen,
231 const unsigned char *iv, size_t ivlen)
233 return ccm_init(vctx, key, keylen, iv, ivlen, 1);
236 int ccm_dinit(void *vctx, const unsigned char *key, size_t keylen,
237 const unsigned char *iv, size_t ivlen)
239 return ccm_init(vctx, key, keylen, iv, ivlen, 0);
242 int ccm_stream_update(void *vctx, unsigned char *out, size_t *outl,
243 size_t outsize, const unsigned char *in,
246 PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
249 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
253 if (!ccm_cipher_internal(ctx, out, outl, in, inl)) {
254 ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
260 int ccm_stream_final(void *vctx, unsigned char *out, size_t *outl,
263 PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
266 i = ccm_cipher_internal(ctx, out, outl, NULL, 0);
274 int ccm_cipher(void *vctx,
275 unsigned char *out, size_t *outl, size_t outsize,
276 const unsigned char *in, size_t inl)
278 PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
281 ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
285 if (ccm_cipher_internal(ctx, out, outl, in, inl) <= 0)
292 /* Copy the buffered iv */
293 static int ccm_set_iv(PROV_CCM_CTX *ctx, size_t mlen)
295 const PROV_CCM_HW *hw = ctx->hw;
297 if (!hw->setiv(ctx, ctx->iv, ccm_get_ivlen(ctx), mlen))
303 static int ccm_tls_cipher(PROV_CCM_CTX *ctx,
304 unsigned char *out, size_t *padlen,
305 const unsigned char *in, size_t len)
310 /* Encrypt/decrypt must be performed in place */
311 if (in == NULL || out != in || len < EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m)
314 /* If encrypting set explicit IV from sequence number (start of AAD) */
316 memcpy(out, ctx->buf, EVP_CCM_TLS_EXPLICIT_IV_LEN);
317 /* Get rest of IV from explicit IV */
318 memcpy(ctx->iv + EVP_CCM_TLS_FIXED_IV_LEN, in, EVP_CCM_TLS_EXPLICIT_IV_LEN);
319 /* Correct length value */
320 len -= EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m;
321 if (!ccm_set_iv(ctx, len))
325 if (!ctx->hw->setaad(ctx, ctx->buf, ctx->tls_aad_len))
328 /* Fix buffer to point to payload */
329 in += EVP_CCM_TLS_EXPLICIT_IV_LEN;
330 out += EVP_CCM_TLS_EXPLICIT_IV_LEN;
332 if (!ctx->hw->auth_encrypt(ctx, in, out, len, out + len, ctx->m))
334 olen = len + EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m;
336 if (!ctx->hw->auth_decrypt(ctx, in, out, len,
337 (unsigned char *)in + len, ctx->m))
347 static int ccm_cipher_internal(PROV_CCM_CTX *ctx, unsigned char *out,
348 size_t *padlen, const unsigned char *in,
353 const PROV_CCM_HW *hw = ctx->hw;
355 /* If no key set, return error */
359 if (ctx->tls_aad_len != UNINITIALISED_SIZET)
360 return ccm_tls_cipher(ctx, out, padlen, in, len);
362 /* EVP_*Final() doesn't return any data */
363 if (in == NULL && out != NULL)
371 if (!ccm_set_iv(ctx, len))
374 /* If we have AAD, we need a message length */
375 if (!ctx->len_set && len)
377 if (!hw->setaad(ctx, in, len))
381 /* If not set length yet do it */
382 if (!ctx->len_set && !ccm_set_iv(ctx, len))
386 if (!hw->auth_encrypt(ctx, in, out, len, NULL, 0))
390 /* The tag must be set before actually decrypting data */
394 if (!hw->auth_decrypt(ctx, in, out, len, ctx->buf, ctx->m))
396 /* Finished - reset flags so calling this method again will fail */
410 void ccm_initctx(PROV_CCM_CTX *ctx, size_t keybits, const PROV_CCM_HW *hw)
412 ctx->keylen = keybits / 8;
419 ctx->tls_aad_len = UNINITIALISED_SIZET;