+++ /dev/null
-/*
- * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
-
-/* Dispatch functions for ccm mode */
-
-#include "prov/ciphercommon.h"
-#include "prov/cipher_ccm.h"
-#include "prov/providercommonerr.h"
-
-static int ccm_cipher_internal(PROV_CCM_CTX *ctx, unsigned char *out,
- size_t *padlen, const unsigned char *in,
- size_t len);
-
-static int ccm_tls_init(PROV_CCM_CTX *ctx, unsigned char *aad, size_t alen)
-{
- size_t len;
-
- if (alen != EVP_AEAD_TLS1_AAD_LEN)
- return 0;
-
- /* Save the aad for later use. */
- memcpy(ctx->buf, aad, alen);
- ctx->tls_aad_len = alen;
-
- len = ctx->buf[alen - 2] << 8 | ctx->buf[alen - 1];
- if (len < EVP_CCM_TLS_EXPLICIT_IV_LEN)
- return 0;
-
- /* Correct length for explicit iv. */
- len -= EVP_CCM_TLS_EXPLICIT_IV_LEN;
-
- if (!ctx->enc) {
- if (len < ctx->m)
- return 0;
- /* Correct length for tag. */
- len -= ctx->m;
- }
- ctx->buf[alen - 2] = (unsigned char)(len >> 8);
- ctx->buf[alen - 1] = (unsigned char)(len & 0xff);
-
- /* Extra padding: tag appended to record. */
- return ctx->m;
-}
-
-static int ccm_tls_iv_set_fixed(PROV_CCM_CTX *ctx, unsigned char *fixed,
- size_t flen)
-{
- if (flen != EVP_CCM_TLS_FIXED_IV_LEN)
- return 0;
-
- /* Copy to first part of the iv. */
- memcpy(ctx->iv, fixed, flen);
- return 1;
-}
-
-static size_t ccm_get_ivlen(PROV_CCM_CTX *ctx)
-{
- return 15 - ctx->l;
-}
-
-int ccm_set_ctx_params(void *vctx, const OSSL_PARAM params[])
-{
- PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
- const OSSL_PARAM *p;
- size_t sz;
-
- p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TAG);
- if (p != NULL) {
- if (p->data_type != OSSL_PARAM_OCTET_STRING) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
- return 0;
- }
- if ((p->data_size & 1) || (p->data_size < 4) || p->data_size > 16) {
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAGLEN);
- return 0;
- }
-
- if (p->data != NULL) {
- if (ctx->enc) {
- ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_NEEDED);
- return 0;
- }
- memcpy(ctx->buf, p->data, p->data_size);
- ctx->tag_set = 1;
- }
- ctx->m = p->data_size;
- }
-
- p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_IVLEN);
- if (p != NULL) {
- size_t ivlen;
-
- if (!OSSL_PARAM_get_size_t(p, &sz)) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
- return 0;
- }
- ivlen = 15 - sz;
- if (ivlen < 2 || ivlen > 8) {
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN);
- return 0;
- }
- ctx->l = ivlen;
- }
-
- p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD);
- if (p != NULL) {
- if (p->data_type != OSSL_PARAM_OCTET_STRING) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
- return 0;
- }
- sz = ccm_tls_init(ctx, p->data, p->data_size);
- if (sz == 0) {
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DATA);
- return 0;
- }
- ctx->tls_aad_pad_sz = sz;
- }
-
- p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED);
- if (p != NULL) {
- if (p->data_type != OSSL_PARAM_OCTET_STRING) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
- return 0;
- }
- if (ccm_tls_iv_set_fixed(ctx, p->data, p->data_size) == 0) {
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN);
- return 0;
- }
- }
-
- return 1;
-}
-
-int ccm_get_ctx_params(void *vctx, OSSL_PARAM params[])
-{
- PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
- OSSL_PARAM *p;
-
- p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN);
- if (p != NULL && !OSSL_PARAM_set_size_t(p, ccm_get_ivlen(ctx))) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
- return 0;
- }
-
- p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAGLEN);
- if (p != NULL) {
- size_t m = ctx->m;
-
- if (!OSSL_PARAM_set_size_t(p, m)) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
- return 0;
- }
- }
-
- p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IV);
- if (p != NULL) {
- if (ccm_get_ivlen(ctx) != p->data_size) {
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN);
- return 0;
- }
- if (!OSSL_PARAM_set_octet_string(p, ctx->iv, p->data_size)) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
- return 0;
- }
- }
-
- p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN);
- if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->keylen)) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
- return 0;
- }
-
- p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD);
- if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tls_aad_pad_sz)) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
- return 0;
- }
-
- p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAG);
- if (p != NULL) {
- if (!ctx->enc || !ctx->tag_set) {
- ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOTSET);
- return 0;
- }
- if (p->data_type != OSSL_PARAM_OCTET_STRING) {
- ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
- return 0;
- }
- if (!ctx->hw->gettag(ctx, p->data, p->data_size))
- return 0;
- ctx->tag_set = 0;
- ctx->iv_set = 0;
- ctx->len_set = 0;
- }
- return 1;
-}
-
-static int ccm_init(void *vctx, const unsigned char *key, size_t keylen,
- const unsigned char *iv, size_t ivlen, int enc)
-{
- PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
-
- ctx->enc = enc;
-
- if (iv != NULL) {
- if (ivlen != ccm_get_ivlen(ctx)) {
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN);
- return 0;
- }
- memcpy(ctx->iv, iv, ivlen);
- ctx->iv_set = 1;
- }
- if (key != NULL) {
- if (keylen != ctx->keylen) {
- ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEYLEN);
- return 0;
- }
- return ctx->hw->setkey(ctx, key, keylen);
- }
- return 1;
-}
-
-int ccm_einit(void *vctx, const unsigned char *key, size_t keylen,
- const unsigned char *iv, size_t ivlen)
-{
- return ccm_init(vctx, key, keylen, iv, ivlen, 1);
-}
-
-int ccm_dinit(void *vctx, const unsigned char *key, size_t keylen,
- const unsigned char *iv, size_t ivlen)
-{
- return ccm_init(vctx, key, keylen, iv, ivlen, 0);
-}
-
-int ccm_stream_update(void *vctx, unsigned char *out, size_t *outl,
- size_t outsize, const unsigned char *in,
- size_t inl)
-{
- PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
-
- if (outsize < inl) {
- ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
- return 0;
- }
-
- if (!ccm_cipher_internal(ctx, out, outl, in, inl)) {
- ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
- return 0;
- }
- return 1;
-}
-
-int ccm_stream_final(void *vctx, unsigned char *out, size_t *outl,
- size_t outsize)
-{
- PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
- int i;
-
- i = ccm_cipher_internal(ctx, out, outl, NULL, 0);
- if (i <= 0)
- return 0;
-
- *outl = 0;
- return 1;
-}
-
-int ccm_cipher(void *vctx,
- unsigned char *out, size_t *outl, size_t outsize,
- const unsigned char *in, size_t inl)
-{
- PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
-
- if (outsize < inl) {
- ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
- return 0;
- }
-
- if (ccm_cipher_internal(ctx, out, outl, in, inl) <= 0)
- return 0;
-
- *outl = inl;
- return 1;
-}
-
-/* Copy the buffered iv */
-static int ccm_set_iv(PROV_CCM_CTX *ctx, size_t mlen)
-{
- const PROV_CCM_HW *hw = ctx->hw;
-
- if (!hw->setiv(ctx, ctx->iv, ccm_get_ivlen(ctx), mlen))
- return 0;
- ctx->len_set = 1;
- return 1;
-}
-
-static int ccm_tls_cipher(PROV_CCM_CTX *ctx,
- unsigned char *out, size_t *padlen,
- const unsigned char *in, size_t len)
-{
- int rv = 0;
- size_t olen = 0;
-
- /* Encrypt/decrypt must be performed in place */
- if (out != in || len < (EVP_CCM_TLS_EXPLICIT_IV_LEN + (size_t)ctx->m))
- goto err;
-
- /* If encrypting set explicit IV from sequence number (start of AAD) */
- if (ctx->enc)
- memcpy(out, ctx->buf, EVP_CCM_TLS_EXPLICIT_IV_LEN);
- /* Get rest of IV from explicit IV */
- memcpy(ctx->iv + EVP_CCM_TLS_FIXED_IV_LEN, in, EVP_CCM_TLS_EXPLICIT_IV_LEN);
- /* Correct length value */
- len -= EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m;
- if (!ccm_set_iv(ctx, len))
- goto err;
-
- /* Use saved AAD */
- if (!ctx->hw->setaad(ctx, ctx->buf, ctx->tls_aad_len))
- goto err;
-
- /* Fix buffer to point to payload */
- in += EVP_CCM_TLS_EXPLICIT_IV_LEN;
- out += EVP_CCM_TLS_EXPLICIT_IV_LEN;
- if (ctx->enc) {
- if (!ctx->hw->auth_encrypt(ctx, in, out, len, out + len, ctx->m))
- goto err;
- olen = len + EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m;
- } else {
- if (!ctx->hw->auth_decrypt(ctx, in, out, len,
- (unsigned char *)in + len, ctx->m))
- goto err;
- olen = len;
- }
- rv = 1;
-err:
- *padlen = olen;
- return rv;
-}
-
-static int ccm_cipher_internal(PROV_CCM_CTX *ctx, unsigned char *out,
- size_t *padlen, const unsigned char *in,
- size_t len)
-{
- int rv = 0;
- size_t olen = 0;
- const PROV_CCM_HW *hw = ctx->hw;
-
- /* If no key set, return error */
- if (!ctx->key_set)
- return 0;
-
- if (ctx->tls_aad_len != UNINITIALISED_SIZET)
- return ccm_tls_cipher(ctx, out, padlen, in, len);
-
- /* EVP_*Final() doesn't return any data */
- if (in == NULL && out != NULL)
- goto finish;
-
- if (!ctx->iv_set)
- goto err;
-
- if (out == NULL) {
- if (in == NULL) {
- if (!ccm_set_iv(ctx, len))
- goto err;
- } else {
- /* If we have AAD, we need a message length */
- if (!ctx->len_set && len)
- goto err;
- if (!hw->setaad(ctx, in, len))
- goto err;
- }
- } else {
- /* If not set length yet do it */
- if (!ctx->len_set && !ccm_set_iv(ctx, len))
- goto err;
-
- if (ctx->enc) {
- if (!hw->auth_encrypt(ctx, in, out, len, NULL, 0))
- goto err;
- ctx->tag_set = 1;
- } else {
- /* The tag must be set before actually decrypting data */
- if (!ctx->tag_set)
- goto err;
-
- if (!hw->auth_decrypt(ctx, in, out, len, ctx->buf, ctx->m))
- goto err;
- /* Finished - reset flags so calling this method again will fail */
- ctx->iv_set = 0;
- ctx->tag_set = 0;
- ctx->len_set = 0;
- }
- }
- olen = len;
-finish:
- rv = 1;
-err:
- *padlen = olen;
- return rv;
-}
-
-void ccm_initctx(PROV_CCM_CTX *ctx, size_t keybits, const PROV_CCM_HW *hw)
-{
- ctx->keylen = keybits / 8;
- ctx->key_set = 0;
- ctx->iv_set = 0;
- ctx->tag_set = 0;
- ctx->len_set = 0;
- ctx->l = 8;
- ctx->m = 12;
- ctx->tls_aad_len = UNINITIALISED_SIZET;
- ctx->hw = hw;
-}
-
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