demos/cipher/aesccm.c - third_party/openssl - Git at Google

 /*
  * Copyright 2013-2021 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
  */

 /*
  * Simple AES CCM authenticated encryption with additional data (AEAD)
  * demonstration program.
  */

 #include <stdio.h>
 #include <openssl/err.h>
 #include <openssl/bio.h>
 #include <openssl/evp.h>
 #include <openssl/core_names.h>

 /* AES-CCM test data obtained from NIST public test vectors */

 /* AES key */
 static const unsigned char ccm_key[] = {
     0xce, 0xb0, 0x09, 0xae, 0xa4, 0x45, 0x44, 0x51, 0xfe, 0xad, 0xf0, 0xe6,
     0xb3, 0x6f, 0x45, 0x55, 0x5d, 0xd0, 0x47, 0x23, 0xba, 0xa4, 0x48, 0xe8
 };

 /* Unique nonce to be used for this message */
 static const unsigned char ccm_nonce[] = {
     0x76, 0x40, 0x43, 0xc4, 0x94, 0x60, 0xb7
 };

 /*
  * Example of Additional Authenticated Data (AAD), i.e. unencrypted data
  * which can be authenticated using the generated Tag value.
  */
 static const unsigned char ccm_adata[] = {
     0x6e, 0x80, 0xdd, 0x7f, 0x1b, 0xad, 0xf3, 0xa1, 0xc9, 0xab, 0x25, 0xc7,
     0x5f, 0x10, 0xbd, 0xe7, 0x8c, 0x23, 0xfa, 0x0e, 0xb8, 0xf9, 0xaa, 0xa5,
     0x3a, 0xde, 0xfb, 0xf4, 0xcb, 0xf7, 0x8f, 0xe4
 };

 /* Example plaintext to encrypt */
 static const unsigned char ccm_pt[] = {
     0xc8, 0xd2, 0x75, 0xf9, 0x19, 0xe1, 0x7d, 0x7f, 0xe6, 0x9c, 0x2a, 0x1f,
     0x58, 0x93, 0x9d, 0xfe, 0x4d, 0x40, 0x37, 0x91, 0xb5, 0xdf, 0x13, 0x10
 };

 /* Expected ciphertext value */
 static const unsigned char ccm_ct[] = {
     0x8a, 0x0f, 0x3d, 0x82, 0x29, 0xe4, 0x8e, 0x74, 0x87, 0xfd, 0x95, 0xa2,
     0x8a, 0xd3, 0x92, 0xc8, 0x0b, 0x36, 0x81, 0xd4, 0xfb, 0xc7, 0xbb, 0xfd
 };

 /* Expected AEAD Tag value */
 static const unsigned char ccm_tag[] = {
     0x2d, 0xd6, 0xef, 0x1c, 0x45, 0xd4, 0xcc, 0xb7, 0x23, 0xdc, 0x07, 0x44,
     0x14, 0xdb, 0x50, 0x6d
 };

 /*
  * A library context and property query can be used to select & filter
  * algorithm implementations. If they are NULL then the default library
  * context and properties are used.
  */
 OSSL_LIB_CTX *libctx = NULL;
 const char *propq = NULL;


 int aes_ccm_encrypt(void)
 {
     int ret = 0;
     EVP_CIPHER_CTX *ctx;
     EVP_CIPHER *cipher = NULL;
     int outlen, tmplen;
     size_t ccm_nonce_len = sizeof(ccm_nonce);
     size_t ccm_tag_len = sizeof(ccm_tag);
     unsigned char outbuf[1024];
     unsigned char outtag[16];
     OSSL_PARAM params[3] = {
         OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END
     };

     printf("AES CCM Encrypt:\n");
     printf("Plaintext:\n");
     BIO_dump_fp(stdout, ccm_pt, sizeof(ccm_pt));

     /* Create a context for the encrypt operation */
     if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
         goto err;

     /* Fetch the cipher implementation */
     if ((cipher = EVP_CIPHER_fetch(libctx, "AES-192-CCM", propq)) == NULL)
         goto err;

     /* Set nonce length if default 96 bits is not appropriate */
     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_IVLEN,
                                             &ccm_nonce_len);
     /* Set tag length */
     params[1] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
                                                   NULL, ccm_tag_len);

     /*
      * Initialise encrypt operation with the cipher & mode,
      * nonce length and tag length parameters.
      */
     if (!EVP_EncryptInit_ex2(ctx, cipher, NULL, NULL, params))
         goto err;

     /* Initialise key and nonce */
     if (!EVP_EncryptInit_ex(ctx, NULL, NULL, ccm_key, ccm_nonce))
         goto err;

     /* Set plaintext length: only needed if AAD is used */
     if (!EVP_EncryptUpdate(ctx, NULL, &outlen, NULL, sizeof(ccm_pt)))
         goto err;

     /* Zero or one call to specify any AAD */
     if (!EVP_EncryptUpdate(ctx, NULL, &outlen, ccm_adata, sizeof(ccm_adata)))
         goto err;

     /* Encrypt plaintext: can only be called once */
     if (!EVP_EncryptUpdate(ctx, outbuf, &outlen, ccm_pt, sizeof(ccm_pt)))
         goto err;

     /* Output encrypted block */
     printf("Ciphertext:\n");
     BIO_dump_fp(stdout, outbuf, outlen);

     /* Finalise: note get no output for CCM */
     if (!EVP_EncryptFinal_ex(ctx, NULL, &tmplen))
         goto err;

     /* Get tag */
     params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
                                                   outtag, ccm_tag_len);
     params[1] = OSSL_PARAM_construct_end();

     if (!EVP_CIPHER_CTX_get_params(ctx, params))
         goto err;

     /* Output tag */
     printf("Tag:\n");
     BIO_dump_fp(stdout, outtag, ccm_tag_len);

     ret = 1;
 err:
     if (!ret)
         ERR_print_errors_fp(stderr);

     EVP_CIPHER_free(cipher);
     EVP_CIPHER_CTX_free(ctx);

     return ret;
 }

 int aes_ccm_decrypt(void)
 {
     int ret = 0;
     EVP_CIPHER_CTX *ctx;
     EVP_CIPHER *cipher = NULL;
     int outlen, rv;
     unsigned char outbuf[1024];
     size_t ccm_nonce_len = sizeof(ccm_nonce);
     OSSL_PARAM params[3] = {
         OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END
     };

     printf("AES CCM Decrypt:\n");
     printf("Ciphertext:\n");
     BIO_dump_fp(stdout, ccm_ct, sizeof(ccm_ct));

     if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
         goto err;

     /* Fetch the cipher implementation */
     if ((cipher = EVP_CIPHER_fetch(libctx, "AES-192-CCM", propq)) == NULL)
         goto err;

     /* Set nonce length if default 96 bits is not appropriate */
     params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_IVLEN,
                                             &ccm_nonce_len);
     /* Set tag length */
     params[1] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
                                                   (unsigned char *)ccm_tag,
                                                   sizeof(ccm_tag));
     /*
      * Initialise decrypt operation with the cipher & mode,
      * nonce length and expected tag parameters.
      */
     if (!EVP_DecryptInit_ex2(ctx, cipher, NULL, NULL, params))
         goto err;

     /* Specify key and IV */
     if (!EVP_DecryptInit_ex(ctx, NULL, NULL, ccm_key, ccm_nonce))
         goto err;

     /* Set ciphertext length: only needed if we have AAD */
     if (!EVP_DecryptUpdate(ctx, NULL, &outlen, NULL, sizeof(ccm_ct)))
         goto err;

     /* Zero or one call to specify any AAD */
     if (!EVP_DecryptUpdate(ctx, NULL, &outlen, ccm_adata, sizeof(ccm_adata)))
         goto err;

     /* Decrypt plaintext, verify tag: can only be called once */
     rv = EVP_DecryptUpdate(ctx, outbuf, &outlen, ccm_ct, sizeof(ccm_ct));

     /* Output decrypted block: if tag verify failed we get nothing */
     if (rv > 0) {
         printf("Tag verify successful!\nPlaintext:\n");
         BIO_dump_fp(stdout, outbuf, outlen);
     } else {
         printf("Tag verify failed!\nPlaintext not available\n");
         goto err;
     }
     ret = 1;
 err:
     if (!ret)
         ERR_print_errors_fp(stderr);

     EVP_CIPHER_free(cipher);
     EVP_CIPHER_CTX_free(ctx);

     return ret;
 }

 int main(int argc, char **argv)
 {
     if (!aes_ccm_encrypt())
         return 1;

     if (!aes_ccm_decrypt())
         return 1;

     return 0;
 }
	/*
	* Copyright 2013-2021 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
	*/

	/*
	* Simple AES CCM authenticated encryption with additional data (AEAD)
	* demonstration program.
	*/

	#include <stdio.h>
	#include <openssl/err.h>
	#include <openssl/bio.h>
	#include <openssl/evp.h>
	#include <openssl/core_names.h>

	/* AES-CCM test data obtained from NIST public test vectors */

	/* AES key */
	static const unsigned char ccm_key[] = {
	0xce, 0xb0, 0x09, 0xae, 0xa4, 0x45, 0x44, 0x51, 0xfe, 0xad, 0xf0, 0xe6,
	0xb3, 0x6f, 0x45, 0x55, 0x5d, 0xd0, 0x47, 0x23, 0xba, 0xa4, 0x48, 0xe8
	};

	/* Unique nonce to be used for this message */
	static const unsigned char ccm_nonce[] = {
	0x76, 0x40, 0x43, 0xc4, 0x94, 0x60, 0xb7
	};

	/*
	* Example of Additional Authenticated Data (AAD), i.e. unencrypted data
	* which can be authenticated using the generated Tag value.
	*/
	static const unsigned char ccm_adata[] = {
	0x6e, 0x80, 0xdd, 0x7f, 0x1b, 0xad, 0xf3, 0xa1, 0xc9, 0xab, 0x25, 0xc7,
	0x5f, 0x10, 0xbd, 0xe7, 0x8c, 0x23, 0xfa, 0x0e, 0xb8, 0xf9, 0xaa, 0xa5,
	0x3a, 0xde, 0xfb, 0xf4, 0xcb, 0xf7, 0x8f, 0xe4
	};

	/* Example plaintext to encrypt */
	static const unsigned char ccm_pt[] = {
	0xc8, 0xd2, 0x75, 0xf9, 0x19, 0xe1, 0x7d, 0x7f, 0xe6, 0x9c, 0x2a, 0x1f,
	0x58, 0x93, 0x9d, 0xfe, 0x4d, 0x40, 0x37, 0x91, 0xb5, 0xdf, 0x13, 0x10
	};

	/* Expected ciphertext value */
	static const unsigned char ccm_ct[] = {
	0x8a, 0x0f, 0x3d, 0x82, 0x29, 0xe4, 0x8e, 0x74, 0x87, 0xfd, 0x95, 0xa2,
	0x8a, 0xd3, 0x92, 0xc8, 0x0b, 0x36, 0x81, 0xd4, 0xfb, 0xc7, 0xbb, 0xfd
	};

	/* Expected AEAD Tag value */
	static const unsigned char ccm_tag[] = {
	0x2d, 0xd6, 0xef, 0x1c, 0x45, 0xd4, 0xcc, 0xb7, 0x23, 0xdc, 0x07, 0x44,
	0x14, 0xdb, 0x50, 0x6d
	};

	/*
	* A library context and property query can be used to select & filter
	* algorithm implementations. If they are NULL then the default library
	* context and properties are used.
	*/
	OSSL_LIB_CTX *libctx = NULL;
	const char *propq = NULL;


	int aes_ccm_encrypt(void)
	{
	int ret = 0;
	EVP_CIPHER_CTX *ctx;
	EVP_CIPHER *cipher = NULL;
	int outlen, tmplen;
	size_t ccm_nonce_len = sizeof(ccm_nonce);
	size_t ccm_tag_len = sizeof(ccm_tag);
	unsigned char outbuf[1024];
	unsigned char outtag[16];
	OSSL_PARAM params[3] = {
	OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END
	};

	printf("AES CCM Encrypt:\n");
	printf("Plaintext:\n");
	BIO_dump_fp(stdout, ccm_pt, sizeof(ccm_pt));

	/* Create a context for the encrypt operation */
	if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
	goto err;

	/* Fetch the cipher implementation */
	if ((cipher = EVP_CIPHER_fetch(libctx, "AES-192-CCM", propq)) == NULL)
	goto err;

	/* Set nonce length if default 96 bits is not appropriate */
	params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_IVLEN,
	&ccm_nonce_len);
	/* Set tag length */
	params[1] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
	NULL, ccm_tag_len);

	/*
	* Initialise encrypt operation with the cipher & mode,
	* nonce length and tag length parameters.
	*/
	if (!EVP_EncryptInit_ex2(ctx, cipher, NULL, NULL, params))
	goto err;

	/* Initialise key and nonce */
	if (!EVP_EncryptInit_ex(ctx, NULL, NULL, ccm_key, ccm_nonce))
	goto err;

	/* Set plaintext length: only needed if AAD is used */
	if (!EVP_EncryptUpdate(ctx, NULL, &outlen, NULL, sizeof(ccm_pt)))
	goto err;

	/* Zero or one call to specify any AAD */
	if (!EVP_EncryptUpdate(ctx, NULL, &outlen, ccm_adata, sizeof(ccm_adata)))
	goto err;

	/* Encrypt plaintext: can only be called once */
	if (!EVP_EncryptUpdate(ctx, outbuf, &outlen, ccm_pt, sizeof(ccm_pt)))
	goto err;

	/* Output encrypted block */
	printf("Ciphertext:\n");
	BIO_dump_fp(stdout, outbuf, outlen);

	/* Finalise: note get no output for CCM */
	if (!EVP_EncryptFinal_ex(ctx, NULL, &tmplen))
	goto err;

	/* Get tag */
	params[0] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
	outtag, ccm_tag_len);
	params[1] = OSSL_PARAM_construct_end();

	if (!EVP_CIPHER_CTX_get_params(ctx, params))
	goto err;

	/* Output tag */
	printf("Tag:\n");
	BIO_dump_fp(stdout, outtag, ccm_tag_len);

	ret = 1;
	err:
	if (!ret)
	ERR_print_errors_fp(stderr);

	EVP_CIPHER_free(cipher);
	EVP_CIPHER_CTX_free(ctx);

	return ret;
	}

	int aes_ccm_decrypt(void)
	{
	int ret = 0;
	EVP_CIPHER_CTX *ctx;
	EVP_CIPHER *cipher = NULL;
	int outlen, rv;
	unsigned char outbuf[1024];
	size_t ccm_nonce_len = sizeof(ccm_nonce);
	OSSL_PARAM params[3] = {
	OSSL_PARAM_END, OSSL_PARAM_END, OSSL_PARAM_END
	};

	printf("AES CCM Decrypt:\n");
	printf("Ciphertext:\n");
	BIO_dump_fp(stdout, ccm_ct, sizeof(ccm_ct));

	if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
	goto err;

	/* Fetch the cipher implementation */
	if ((cipher = EVP_CIPHER_fetch(libctx, "AES-192-CCM", propq)) == NULL)
	goto err;

	/* Set nonce length if default 96 bits is not appropriate */
	params[0] = OSSL_PARAM_construct_size_t(OSSL_CIPHER_PARAM_AEAD_IVLEN,
	&ccm_nonce_len);
	/* Set tag length */
	params[1] = OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG,
	(unsigned char *)ccm_tag,
	sizeof(ccm_tag));
	/*
	* Initialise decrypt operation with the cipher & mode,
	* nonce length and expected tag parameters.
	*/
	if (!EVP_DecryptInit_ex2(ctx, cipher, NULL, NULL, params))
	goto err;

	/* Specify key and IV */
	if (!EVP_DecryptInit_ex(ctx, NULL, NULL, ccm_key, ccm_nonce))
	goto err;

	/* Set ciphertext length: only needed if we have AAD */
	if (!EVP_DecryptUpdate(ctx, NULL, &outlen, NULL, sizeof(ccm_ct)))
	goto err;

	/* Zero or one call to specify any AAD */
	if (!EVP_DecryptUpdate(ctx, NULL, &outlen, ccm_adata, sizeof(ccm_adata)))
	goto err;

	/* Decrypt plaintext, verify tag: can only be called once */
	rv = EVP_DecryptUpdate(ctx, outbuf, &outlen, ccm_ct, sizeof(ccm_ct));

	/* Output decrypted block: if tag verify failed we get nothing */
	if (rv > 0) {
	printf("Tag verify successful!\nPlaintext:\n");
	BIO_dump_fp(stdout, outbuf, outlen);
	} else {
	printf("Tag verify failed!\nPlaintext not available\n");
	goto err;
	}
	ret = 1;
	err:
	if (!ret)
	ERR_print_errors_fp(stderr);

	EVP_CIPHER_free(cipher);
	EVP_CIPHER_CTX_free(ctx);

	return ret;
	}

	int main(int argc, char **argv)
	{
	if (!aes_ccm_encrypt())
	return 1;

	if (!aes_ccm_decrypt())
	return 1;

	return 0;
	}