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+/*
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+ * Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
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+ *
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+ * Licensed under the Apache License 2.0 (the "License"). You may not use
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+ * this file except in compliance with the License. You can obtain a copy
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+ * in the file LICENSE in the source distribution or at
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+ * https://www.openssl.org/source/license.html
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+ */
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+
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+/*
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+ * Simple aes wrap encryption demonstration program.
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+ */
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+
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+#include <stdio.h>
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+#include <openssl/err.h>
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+#include <openssl/bio.h>
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+#include <openssl/evp.h>
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+#include <openssl/crypto.h>
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+#include <openssl/core_names.h>
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+
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+/* aes key */
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+static const unsigned char wrap_key[] = {
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+ 0xee, 0xbc, 0x1f, 0x57, 0x48, 0x7f, 0x51, 0x92, 0x1c, 0x04, 0x65, 0x66,
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+ 0x5f, 0x8a, 0xe6, 0xd1, 0x65, 0x8b, 0xb2, 0x6d, 0xe6, 0xf8, 0xa0, 0x69,
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+ 0xa3, 0x52, 0x02, 0x93, 0xa5, 0x72, 0x07, 0x8f
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+};
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+
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+/* Unique initialisation vector */
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+static const unsigned char wrap_iv[] = {
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+ 0x99, 0xaa, 0x3e, 0x68, 0xed, 0x81, 0x73, 0xa0, 0xee, 0xd0, 0x66, 0x84,
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+ 0x99, 0xaa, 0x3e, 0x68,
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+};
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+
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+/* Example plaintext to encrypt */
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+static const unsigned char wrap_pt[] = {
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+ 0xad, 0x4f, 0xc9, 0xfc, 0x77, 0x69, 0xc9, 0xea, 0xfc, 0xdf, 0x00, 0xac,
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+ 0x34, 0xec, 0x40, 0xbc, 0x28, 0x3f, 0xa4, 0x5e, 0xd8, 0x99, 0xe4, 0x5d,
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+ 0x5e, 0x7a, 0xc4, 0xe6, 0xca, 0x7b, 0xa5, 0xb7,
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+};
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+
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+/* Expected ciphertext value */
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+static const unsigned char wrap_ct[] = {
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+ 0x97, 0x99, 0x55, 0xca, 0xf6, 0x3e, 0x95, 0x54, 0x39, 0xd6, 0xaf, 0x63, 0xff, 0x2c, 0xe3, 0x96,
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+ 0xf7, 0x0d, 0x2c, 0x9c, 0xc7, 0x43, 0xc0, 0xb6, 0x31, 0x43, 0xb9, 0x20, 0xac, 0x6b, 0xd3, 0x67,
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+ 0xad, 0x01, 0xaf, 0xa7, 0x32, 0x74, 0x26, 0x92,
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+};
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+
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+/*
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+ * A library context and property query can be used to select & filter
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+ * algorithm implementations. If they are NULL then the default library
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+ * context and properties are used.
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+ */
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+OSSL_LIB_CTX *libctx = NULL;
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+const char *propq = NULL;
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+
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+int aes_wrap_encrypt(void)
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+{
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+ int ret = 0;
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+ EVP_CIPHER_CTX *ctx;
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+ EVP_CIPHER *cipher = NULL;
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+ int outlen, tmplen;
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+ unsigned char outbuf[1024];
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+
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+ printf("aes wrap Encrypt:\n");
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+ printf("Plaintext:\n");
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+ BIO_dump_fp(stdout, wrap_pt, sizeof(wrap_pt));
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+
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+ /* Create a context for the encrypt operation */
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+ if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
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+ goto err;
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+
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+ EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
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+
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+ /* Fetch the cipher implementation */
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+ if ((cipher = EVP_CIPHER_fetch(libctx, "AES-256-WRAP", propq)) == NULL)
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+ goto err;
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+
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+ /*
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+ * Initialise an encrypt operation with the cipher/mode, key and IV.
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+ * We are not setting any custom params so let params be just NULL.
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+ */
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+ if (!EVP_EncryptInit_ex2(ctx, cipher, wrap_key, wrap_iv, /* params */ NULL))
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+ goto err;
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+
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+ /* Encrypt plaintext */
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+ if (!EVP_EncryptUpdate(ctx, outbuf, &outlen, wrap_pt, sizeof(wrap_pt)))
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+ goto err;
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+
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+ /* Finalise: there can be some additional output from padding */
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+ if (!EVP_EncryptFinal_ex(ctx, outbuf + outlen, &tmplen))
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+ goto err;
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+ outlen += tmplen;
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+
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+ /* Output encrypted block */
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+ printf("Ciphertext (outlen:%d):\n", outlen);
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+ BIO_dump_fp(stdout, outbuf, outlen);
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+
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+ if (sizeof(wrap_ct) == outlen && !CRYPTO_memcmp(outbuf, wrap_ct, outlen))
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+ printf("Final ciphertext matches expected ciphertext\n");
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+ else
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+ printf("Final ciphertext differs from expected ciphertext\n");
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+
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+ ret = 1;
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+err:
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+ if (!ret)
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+ ERR_print_errors_fp(stderr);
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+
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+ EVP_CIPHER_free(cipher);
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+ EVP_CIPHER_CTX_free(ctx);
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+
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+ return ret;
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+}
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+
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+int aes_wrap_decrypt(void)
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+{
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+ int ret = 0;
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+ EVP_CIPHER_CTX *ctx;
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+ EVP_CIPHER *cipher = NULL;
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+ int outlen, tmplen;
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+ unsigned char outbuf[1024];
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+
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+ printf("aes wrap Decrypt:\n");
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+ printf("Ciphertext:\n");
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+ BIO_dump_fp(stdout, wrap_ct, sizeof(wrap_ct));
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+
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+ if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
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+ goto err;
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+
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+ EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
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+
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+ /* Fetch the cipher implementation */
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+ if ((cipher = EVP_CIPHER_fetch(libctx, "aes-256-wrap", propq)) == NULL)
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+ goto err;
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+
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+ /*
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+ * Initialise an encrypt operation with the cipher/mode, key and IV.
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+ * We are not setting any custom params so let params be just NULL.
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+ */
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+ if (!EVP_DecryptInit_ex2(ctx, cipher, wrap_key, wrap_iv, /* params */ NULL))
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+ goto err;
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+
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+ /* Decrypt plaintext */
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+ if (!EVP_DecryptUpdate(ctx, outbuf, &outlen, wrap_ct, sizeof(wrap_ct)))
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+ goto err;
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+
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+ /* Finalise: there can be some additional output from padding */
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+ if (!EVP_DecryptFinal_ex(ctx, outbuf + outlen, &tmplen))
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+ goto err;
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+ outlen += tmplen;
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+
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+ /* Output decrypted block */
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+ printf("Plaintext (outlen:%d):\n", outlen);
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+ BIO_dump_fp(stdout, outbuf, outlen);
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+
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+ if (sizeof(wrap_pt) == outlen && !CRYPTO_memcmp(outbuf, wrap_pt, outlen))
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+ printf("Final plaintext matches original plaintext\n");
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+ else
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+ printf("Final plaintext differs from original plaintext\n");
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+
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+ ret = 1;
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+err:
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+ if (!ret)
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+ ERR_print_errors_fp(stderr);
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+
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+ EVP_CIPHER_free(cipher);
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+ EVP_CIPHER_CTX_free(ctx);
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+
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+ return ret;
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+}
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+
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+int main(int argc, char **argv)
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+{
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+ if (!aes_wrap_encrypt())
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+ return 1;
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+
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+ if (!aes_wrap_decrypt())
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+ return 1;
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+
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+ return 0;
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+}
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+
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