--- /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
+ */
+
+#include "cipher_aes.h"
+#include "internal/providercommonerr.h"
+#include "internal/provider_algs.h"
+
+/* AES wrap with padding has IV length of 4, without padding 8 */
+#define AES_WRAP_PAD_IVLEN 4
+#define AES_WRAP_NOPAD_IVLEN 8
+
+/* TODO(3.0) Figure out what flags need to be passed */
+#define WRAP_FLAGS (EVP_CIPH_WRAP_MODE \
+ | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \
+ | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_FLAG_DEFAULT_ASN1)
+
+typedef size_t (*aeswrap_fn)(void *key, const unsigned char *iv,
+ unsigned char *out, const unsigned char *in,
+ size_t inlen, block128_f block);
+
+static OSSL_OP_cipher_encrypt_init_fn aes_wrap_einit;
+static OSSL_OP_cipher_decrypt_init_fn aes_wrap_dinit;
+static OSSL_OP_cipher_update_fn aes_wrap_cipher;
+static OSSL_OP_cipher_final_fn aes_wrap_final;
+static OSSL_OP_cipher_freectx_fn aes_wrap_freectx;
+
+typedef struct prov_aes_wrap_ctx_st {
+ PROV_CIPHER_CTX base;
+ union {
+ OSSL_UNION_ALIGN;
+ AES_KEY ks;
+ } ks;
+ unsigned int iv_set : 1;
+ aeswrap_fn wrapfn;
+
+} PROV_AES_WRAP_CTX;
+
+
+static void *aes_wrap_newctx(size_t kbits, size_t blkbits,
+ size_t ivbits, unsigned int mode, uint64_t flags)
+{
+ PROV_AES_WRAP_CTX *wctx = OPENSSL_zalloc(sizeof(*wctx));
+ PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)wctx;
+
+ if (ctx != NULL) {
+ cipher_generic_initkey(ctx, kbits, blkbits, ivbits, mode, flags,
+ NULL, NULL);
+ ctx->pad = (ctx->ivlen == AES_WRAP_PAD_IVLEN);
+ }
+ return wctx;
+}
+
+static void aes_wrap_freectx(void *vctx)
+{
+ PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
+ PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
+
+ OPENSSL_cleanse(ctx->iv, sizeof(ctx->iv));
+ OPENSSL_clear_free(wctx, sizeof(*wctx));
+}
+
+static int aes_wrap_init(void *vctx, const unsigned char *key,
+ size_t keylen, const unsigned char *iv,
+ size_t ivlen, int enc)
+{
+ PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
+ PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
+
+ ctx->enc = enc;
+ ctx->block = enc ? (block128_f)AES_encrypt : (block128_f)AES_decrypt;
+ if (ctx->pad)
+ wctx->wrapfn = enc ? CRYPTO_128_wrap_pad : CRYPTO_128_unwrap_pad;
+ else
+ wctx->wrapfn = enc ? CRYPTO_128_wrap : CRYPTO_128_unwrap;
+
+ if (iv != NULL) {
+ ctx->ivlen = ivlen;
+ memcpy(ctx->iv, iv, ivlen);
+ wctx->iv_set = 1;
+ }
+ if (key != NULL) {
+ if (keylen != ctx->keylen) {
+ ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
+ return 0;
+ }
+ if (ctx->enc)
+ AES_set_encrypt_key(key, keylen * 8, &wctx->ks.ks);
+ else
+ AES_set_decrypt_key(key, keylen * 8, &wctx->ks.ks);
+ }
+ return 1;
+}
+
+static int aes_wrap_einit(void *ctx, const unsigned char *key, size_t keylen,
+ const unsigned char *iv, size_t ivlen)
+{
+ return aes_wrap_init(ctx, key, keylen, iv, ivlen, 1);
+}
+
+static int aes_wrap_dinit(void *ctx, const unsigned char *key, size_t keylen,
+ const unsigned char *iv, size_t ivlen)
+{
+ return aes_wrap_init(ctx, key, keylen, iv, ivlen, 0);
+}
+
+static int aes_wrap_cipher_internal(void *vctx, unsigned char *out,
+ const unsigned char *in, size_t inlen)
+{
+ PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
+ PROV_AES_WRAP_CTX *wctx = (PROV_AES_WRAP_CTX *)vctx;
+ size_t rv;
+ int pad = ctx->pad;
+
+ /* No final operation so always return zero length */
+ if (in == NULL)
+ return 0;
+
+ /* Input length must always be non-zero */
+ if (inlen == 0)
+ return -1;
+
+ /* If decrypting need at least 16 bytes and multiple of 8 */
+ if (!ctx->enc && (inlen < 16 || inlen & 0x7))
+ return -1;
+
+ /* If not padding input must be multiple of 8 */
+ if (!pad && inlen & 0x7)
+ return -1;
+
+ if (out == NULL) {
+ if (ctx->enc) {
+ /* If padding round up to multiple of 8 */
+ if (pad)
+ inlen = (inlen + 7) / 8 * 8;
+ /* 8 byte prefix */
+ return inlen + 8;
+ } else {
+ /*
+ * If not padding output will be exactly 8 bytes smaller than
+ * input. If padding it will be at least 8 bytes smaller but we
+ * don't know how much.
+ */
+ return inlen - 8;
+ }
+ }
+
+ rv = wctx->wrapfn(&wctx->ks.ks, wctx->iv_set ? ctx->iv : NULL, out, in,
+ inlen, ctx->block);
+ return rv ? (int)rv : -1;
+}
+
+static int aes_wrap_final(void *vctx, unsigned char *out, size_t *outl,
+ size_t outsize)
+{
+ *outl = 0;
+ return 1;
+}
+
+static int aes_wrap_cipher(void *vctx,
+ unsigned char *out, size_t *outl, size_t outsize,
+ const unsigned char *in, size_t inl)
+{
+ PROV_AES_WRAP_CTX *ctx = (PROV_AES_WRAP_CTX *)vctx;
+ size_t len;
+
+ if (outsize < inl) {
+ ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
+ return -1;
+ }
+
+ len = aes_wrap_cipher_internal(ctx, out, in, inl);
+ if (len == 0)
+ return -1;
+
+ *outl = len;
+ return 1;
+}
+
+static int aes_wrap_set_ctx_params(void *vctx, const OSSL_PARAM params[])
+{
+ PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
+ const OSSL_PARAM *p;
+ size_t keylen = 0;
+
+ p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN);
+ if (p != NULL) {
+ if (!OSSL_PARAM_get_size_t(p, &keylen)) {
+ ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
+ return 0;
+ }
+ if (ctx->keylen != keylen) {
+ ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
+ return 0;
+ }
+ }
+ return 1;
+}
+
+#define IMPLEMENT_cipher(mode, fname, UCMODE, flags, kbits, blkbits, ivbits) \
+ static OSSL_OP_cipher_get_params_fn aes_##kbits##_##fname##_get_params; \
+ static int aes_##kbits##_##fname##_get_params(OSSL_PARAM params[]) \
+ { \
+ return cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, \
+ flags, kbits, blkbits, ivbits); \
+ } \
+ static OSSL_OP_cipher_newctx_fn aes_##kbits##fname##_newctx; \
+ static void *aes_##kbits##fname##_newctx(void *provctx) \
+ { \
+ return aes_##mode##_newctx(kbits, blkbits, ivbits, \
+ EVP_CIPH_##UCMODE##_MODE, flags); \
+ } \
+ const OSSL_DISPATCH aes##kbits##fname##_functions[] = { \
+ { OSSL_FUNC_CIPHER_NEWCTX, \
+ (void (*)(void))aes_##kbits##fname##_newctx }, \
+ { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_##mode##_einit }, \
+ { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_##mode##_dinit }, \
+ { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))aes_##mode##_cipher }, \
+ { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))aes_##mode##_final }, \
+ { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))aes_##mode##_freectx }, \
+ { OSSL_FUNC_CIPHER_GET_PARAMS, \
+ (void (*)(void))aes_##kbits##_##fname##_get_params }, \
+ { OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
+ (void (*)(void))cipher_generic_gettable_params }, \
+ { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
+ (void (*)(void))cipher_generic_get_ctx_params }, \
+ { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
+ (void (*)(void))aes_wrap_set_ctx_params }, \
+ { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
+ (void (*)(void))cipher_generic_gettable_ctx_params }, \
+ { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
+ (void (*)(void))cipher_generic_settable_ctx_params }, \
+ { 0, NULL } \
+ }
+
+IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_NOPAD_IVLEN * 8);
+IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_NOPAD_IVLEN * 8);
+IMPLEMENT_cipher(wrap, wrap, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_NOPAD_IVLEN * 8);
+IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 256, 64, AES_WRAP_PAD_IVLEN * 8);
+IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 192, 64, AES_WRAP_PAD_IVLEN * 8);
+IMPLEMENT_cipher(wrap, wrappad, WRAP, WRAP_FLAGS, 128, 64, AES_WRAP_PAD_IVLEN * 8);
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