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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** NetX Crypto Component */
/** */
/** CCM Mode */
/** */
/**************************************************************************/
/**************************************************************************/
#include "nx_crypto_ccm.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ccm_xor PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs XOR operation on the output buffer. */
/* */
/* INPUT */
/* */
/* plaintext Pointer to input plantext */
/* key Value to be xor'ed */
/* ciphertext Output buffer of 16 bytes */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_crypto_ccm_cbc_pad Compute CBC-MAC value with */
/* padding for CCM mode */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), disabled */
/* unaligned access by default,*/
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP static VOID _nx_crypto_ccm_xor(UCHAR *plaintext, UCHAR *key, UCHAR *ciphertext)
{
#ifdef NX_CRYPTO_ENABLE_UNALIGNED_ACCESS
UINT *p = (UINT *)plaintext;
UINT *c = (UINT *)ciphertext;
UINT *k = (UINT *)key;
c[0] = p[0] ^ k[0];
c[1] = p[1] ^ k[1];
c[2] = p[2] ^ k[2];
c[3] = p[3] ^ k[3];
#else
ciphertext[0] = plaintext[0] ^ key[0];
ciphertext[1] = plaintext[1] ^ key[1];
ciphertext[2] = plaintext[2] ^ key[2];
ciphertext[3] = plaintext[3] ^ key[3];
ciphertext[4] = plaintext[4] ^ key[4];
ciphertext[5] = plaintext[5] ^ key[5];
ciphertext[6] = plaintext[6] ^ key[6];
ciphertext[7] = plaintext[7] ^ key[7];
ciphertext[8] = plaintext[8] ^ key[8];
ciphertext[9] = plaintext[9] ^ key[9];
ciphertext[10] = plaintext[10] ^ key[10];
ciphertext[11] = plaintext[11] ^ key[11];
ciphertext[12] = plaintext[12] ^ key[12];
ciphertext[13] = plaintext[13] ^ key[13];
ciphertext[14] = plaintext[14] ^ key[14];
ciphertext[15] = plaintext[15] ^ key[15];
#endif
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ccm_cbc_pad PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function compute CBC-MAC value with padding for CCM mode. */
/* */
/* INPUT */
/* */
/* crypto_metadata Pointer to crypto metadata */
/* crypto_function Pointer to crypto function */
/* input Pointer to clear text input */
/* output Pointer to encrypted output */
/* The output is the last */
/* 16 bytes cipher. */
/* length Length of the input message. */
/* iv Initial Vector */
/* block_size Block size */
/* */
/* OUTPUT */
/* */
/* status Completion status */
/* */
/* CALLS */
/* */
/* _nx_crypto_ccm_xor Perform CCM XOR operation */
/* */
/* CALLED BY */
/* */
/* _nx_crypto_ccm_authentication Perform CCM authentication */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP static VOID _nx_crypto_ccm_cbc_pad(VOID *crypto_metadata,
UINT (*crypto_function)(VOID *, UCHAR *, UCHAR *, UINT),
UCHAR *input, UCHAR *output, UINT length, UCHAR *iv, UINT block_size)
{
UINT i = 0;
UCHAR last_cipher[NX_CRYPTO_CCM_BLOCK_SIZE];
NX_CRYPTO_MEMCPY(last_cipher, iv, block_size); /* Use case of memcpy is verified. */
for (i = 0; i < length; i += block_size)
{
/* XOR */
if ((length - i) < block_size)
{
/* If the length of this block is less than block size, pad it with zero. */
NX_CRYPTO_MEMCPY(output, input + i, length - i); /* Use case of memcpy is verified. */
NX_CRYPTO_MEMSET(output + length - i, 0, block_size - (length - i));
_nx_crypto_ccm_xor(output, last_cipher, output);
}
else
{
_nx_crypto_ccm_xor(input + i, last_cipher, output);
}
/* Encrypt the block. */
crypto_function(crypto_metadata, output, last_cipher, block_size);
}
/* Return last block of the cipher. */
NX_CRYPTO_MEMCPY(output, last_cipher, block_size); /* Use case of memcpy is verified. */
#ifdef NX_SECURE_KEY_CLEAR
NX_CRYPTO_MEMSET(last_cipher, 0, sizeof(last_cipher));
#endif /* NX_SECURE_KEY_CLEAR */
}
NX_CRYPTO_KEEP static VOID _nx_crypto_ccm_authentication_init(VOID *crypto_metadata,
UINT (*crypto_function)(VOID *, UCHAR *, UCHAR *, UINT),
UCHAR *a_data, UINT a_len, UINT m_len,
UCHAR *X, UCHAR *Nonce, UCHAR L,
USHORT M, UINT block_size)
{
UCHAR Flags = 0;
UCHAR B[NX_CRYPTO_CCM_BLOCK_SIZE];
UCHAR temp_len = 0;
NX_CRYPTO_MEMSET(B, 0, NX_CRYPTO_CCM_BLOCK_SIZE);
NX_CRYPTO_MEMSET(X, 0, NX_CRYPTO_CCM_BLOCK_SIZE);
/* AddAuthData: Right-concatenate the l(a) with the string a,
and pad it with zero so that the AddAuthData has length divisible by 16. */
/* PlaintextData: Pad string m with zero so that the PlaintextData has length divisible by 16. */
/* AuthData = AddAuthData||PlaintextData. */
/* Parse the AuthData as B(1)||B(2)||...||B(t), where the block B(i) is a 16-bytes string. */
/* CBC-MAC value X(i + 1) = E(Key, X(i) ^ B(i)), for i = 0, 1,..., t. */
/* Create Flag for B(0). */
if (a_len > 0)
{
Flags = 1 << 6;
}
else
{
Flags = 0;
}
Flags |= (UCHAR)(((M - 2) >> 1) << 3);
Flags |= (UCHAR)(L - 1);
/* B(0) = Flags||Nonce||l(m) */
B[0] = Flags;
NX_CRYPTO_MEMCPY(B + 1, Nonce, (UINT)15 - L); /* Use case of memcpy is verified. */
B[14] = (UCHAR)(m_len >> 8);
B[15] = (UCHAR)(m_len);
/* Get the CBC-MAC value X(1). */
_nx_crypto_ccm_cbc_pad(crypto_metadata, crypto_function, B, X, block_size, X, block_size);
/* B(1) = 2 bytes l(a) + leftmost 14 bytes of string a. */
B[0] = (UCHAR)(a_len >> 8);
B[1] = (UCHAR)(a_len);
/* If the length of string a is less than 14, pad B(1) with 0. */
temp_len = (UCHAR)((a_len > (block_size - 2)) ? (block_size - 2) : a_len);
NX_CRYPTO_MEMCPY(B + 2, a_data, (UINT)temp_len); /* Use case of memcpy is verified. */
/* Get the CBC-MAC value X(2). */
_nx_crypto_ccm_cbc_pad(crypto_metadata, crypto_function, B, X, (UINT)(temp_len + 2), X, block_size);
/* Get the CBC-MAC value X(i), for i = 3,...,t + 1. */
if (a_len > (block_size - 2))
{
_nx_crypto_ccm_cbc_pad(crypto_metadata, crypto_function, a_data + block_size - 2, X, a_len - (block_size - 2), X, block_size);
}
#ifdef NX_SECURE_KEY_CLEAR
NX_CRYPTO_MEMSET(B, 0, sizeof(B));
#endif /* NX_SECURE_KEY_CLEAR */
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ccm_encrypt_init PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function initialize the CCM mode for encryption. */
/* */
/* Note, the first byte of iv represents the length of IV excluding its*/
/* first byte. For example, 0x0401020304 indicates the length of IV is */
/* 4 bytes and the content of IV is 0x01020304. */
/* */
/* INPUT */
/* */
/* crypto_metadata Pointer to crypto metadata */
/* ccm_metadata Pointer to CCM metadata */
/* crypto_function Pointer to crypto function */
/* additional_data Pointer to additional data */
/* additional_len Length of additional data */
/* length Total length of plain/cipher */
/* iv Pointer to Initial Vector */
/* icv_len Length of TAG */
/* block_size Block size of crypto algorithm*/
/* */
/* OUTPUT */
/* */
/* status */
/* */
/* CALLS */
/* */
/* _nx_crypto_ccm_authentication_init Initialize authentication */
/* */
/* CALLED BY */
/* */
/* _nx_crypto_method_aes_ccm_operation Handle AES encrypt or decrypt */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_ccm_encrypt_init(VOID *crypto_metadata, NX_CRYPTO_CCM *ccm_metadata,
UINT (*crypto_function)(VOID *, UCHAR *, UCHAR *, UINT),
VOID *additional_data, UINT additional_len,
UINT length, UCHAR *iv, USHORT icv_len, USHORT block_size)
{
UCHAR L = (UCHAR)(15 - iv[0]);
UCHAR *Nonce = iv + 1;
UCHAR Flags = 0;
UCHAR *A = ccm_metadata -> nx_crypto_ccm_A;
/* Check the block size. */
/* Accroding to RFC 3610, valid values of L range between 2 octets and 8 octets, iv[0] range between 7 octets and 13 octets. */
if (block_size != NX_CRYPTO_CCM_BLOCK_SIZE || iv[0] > 13 || iv[0] < 7)
{
return(NX_CRYPTO_PTR_ERROR);
}
ccm_metadata -> nx_crypto_ccm_icv_length = icv_len;
/* Data authentication. */
if (icv_len > 0)
{
/* Compute authentication tag T. */
_nx_crypto_ccm_authentication_init(crypto_metadata, crypto_function,
(UCHAR *)additional_data, additional_len, length,
ccm_metadata -> nx_crypto_ccm_X,
Nonce, L, icv_len, block_size);
}
NX_CRYPTO_MEMSET(A, 0, sizeof(ccm_metadata -> nx_crypto_ccm_A));
/* Create A(i) = Flags||Nonce||Counter i, for i = 0, 1, 2,.... */
Flags = (UCHAR)(L - 1);
A[0] = Flags;
NX_CRYPTO_MEMCPY(A + 1, Nonce, (UINT)(15 - L)); /* Use case of memcpy is verified. */
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ccm_encrypt_update PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function updates data for GCM encryption or decryption. */
/* */
/* INPUT */
/* */
/* crypto_metadata Pointer to crypto metadata */
/* ccm_metadata Pointer to CCM metadata */
/* crypto_function Pointer to crypto function */
/* input Pointer to bytes of input */
/* output Pointer to output buffer */
/* length Length of bytes of input */
/* block_size Block size of crypto algorithm*/
/* */
/* OUTPUT */
/* */
/* status */
/* */
/* CALLS */
/* */
/* _nx_crypto_ccm_cbc_pad Update data for CCM mode */
/* */
/* CALLED BY */
/* */
/* _nx_crypto_method_aes_ccm_operation Handle AES encrypt or decrypt */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_ccm_encrypt_update(UINT op, VOID *crypto_metadata, NX_CRYPTO_CCM *ccm_metadata,
UINT (*crypto_function)(VOID *, UCHAR *, UCHAR *, UINT),
UCHAR *input, UCHAR *output, UINT length, UINT block_size)
{
UCHAR *A = ccm_metadata -> nx_crypto_ccm_A;
UCHAR X[NX_CRYPTO_CCM_BLOCK_SIZE];
UINT i = 0, k = 0;
/* Check the block size. */
if (block_size != NX_CRYPTO_CCM_BLOCK_SIZE)
{
return(NX_CRYPTO_PTR_ERROR);
}
if (op == NX_CRYPTO_ENCRYPT_UPDATE)
{
/* Data authentication. */
if (ccm_metadata -> nx_crypto_ccm_icv_length > 0)
{
/* Compute authentication tag T. */
_nx_crypto_ccm_cbc_pad(crypto_metadata, crypto_function, input,
ccm_metadata -> nx_crypto_ccm_X, length,
ccm_metadata -> nx_crypto_ccm_X, block_size);
}
}
/* Data encryption. */
if (length > 0)
{
/* Parse the plain text as M(1)||M(2)||..., where the block M(i) is a 16-byte string. */
/* Cipher text block: C(i) = E(Key, A(i)) ^ M(i) */
for (i = 0; i < length; i += block_size)
{
A[15] = (UCHAR)(A[15] + 1);
crypto_function(crypto_metadata, A, X, block_size);
for (k = 0; (k < block_size) && ((i + k) < length); k++)
{
output[i + k] = X[k] ^ input[i + k];
}
}
}
if (op == NX_CRYPTO_DECRYPT_UPDATE)
{
/* Data authentication. */
if (ccm_metadata -> nx_crypto_ccm_icv_length > 0)
{
/* Compute authentication tag T. */
_nx_crypto_ccm_cbc_pad(crypto_metadata, crypto_function, output,
ccm_metadata -> nx_crypto_ccm_X, length,
ccm_metadata -> nx_crypto_ccm_X, block_size);
}
}
#ifdef NX_SECURE_KEY_CLEAR
NX_CRYPTO_MEMSET(X, 0, sizeof(X));
#endif
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ccm_encrypt_calculate PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function calculates TAG for CCM mode. */
/* */
/* INPUT */
/* */
/* crypto_metadata Pointer to crypto metadata */
/* gcm_metadata Pointer to GCM metadata */
/* crypto_function Pointer to crypto function */
/* icv Pointer to TAG buffer */
/* block_size Block size of crypto algorithm*/
/* */
/* OUTPUT */
/* */
/* status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_crypto_method_aes_ccm_operation Handle AES encrypt or decrypt */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_ccm_encrypt_calculate(VOID *crypto_metadata, NX_CRYPTO_CCM *ccm_metadata,
UINT (*crypto_function)(VOID *, UCHAR *, UCHAR *, UINT),
UCHAR *icv, UINT block_size)
{
UCHAR *A = ccm_metadata -> nx_crypto_ccm_A;
UINT i;
/* Check the block size. */
if (block_size != NX_CRYPTO_CCM_BLOCK_SIZE)
{
return(NX_CRYPTO_PTR_ERROR);
}
/* Data authentication. */
if (ccm_metadata -> nx_crypto_ccm_icv_length > 0)
{
/* The authentication tag T is the leftmost M bytes of the CBC-MAC value X(t + 1). */
NX_CRYPTO_MEMCPY(icv, ccm_metadata -> nx_crypto_ccm_X, ccm_metadata -> nx_crypto_ccm_icv_length); /* Use case of memcpy is verified. */
/* Get encryption block X. */
A[15] = 0;
crypto_function(crypto_metadata, A, A, block_size);
/* Encrypt authentication tag. */
for (i = 0; i < ccm_metadata -> nx_crypto_ccm_icv_length; i++)
{
icv[i] = A[i] ^ icv[i];
}
}
#ifdef NX_SECURE_KEY_CLEAR
NX_CRYPTO_MEMSET(ccm_metadata, 0, sizeof(NX_CRYPTO_CCM));
#endif
return(NX_CRYPTO_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _nx_crypto_ccm_decrypt_calculate PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Timothy Stapko, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function verifies the TAG for CCM mode. */
/* */
/* INPUT */
/* */
/* crypto_metadata Pointer to crypto metadata */
/* gcm_metadata Pointer to GCM metadata */
/* crypto_function Pointer to crypto function */
/* icv Pointer to TAG buffer */
/* block_size Block size of crypto algorithm*/
/* */
/* OUTPUT */
/* */
/* status */
/* */
/* CALLS */
/* */
/* None */
/* */
/* CALLED BY */
/* */
/* _nx_crypto_method_aes_ccm_operation Handle AES encrypt or decrypt */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Timothy Stapko Initial Version 6.0 */
/* 09-30-2020 Timothy Stapko Modified comment(s), */
/* verified memcpy use cases, */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
NX_CRYPTO_KEEP UINT _nx_crypto_ccm_decrypt_calculate(VOID *crypto_metadata, NX_CRYPTO_CCM *ccm_metadata,
UINT (*crypto_function)(VOID *, UCHAR *, UCHAR *, UINT),
UCHAR *icv, UINT block_size)
{
UCHAR temp[NX_CRYPTO_CCM_BLOCK_SIZE];
UINT i;
/* Check the block size. */
if (block_size != NX_CRYPTO_CCM_BLOCK_SIZE)
{
return(NX_CRYPTO_PTR_ERROR);
}
/* Data authentication. */
if (ccm_metadata -> nx_crypto_ccm_icv_length > 0)
{
NX_CRYPTO_MEMCPY(temp, ccm_metadata -> nx_crypto_ccm_A, block_size); /* Use case of memcpy is verified. */
temp[15] = 0;
crypto_function(crypto_metadata, temp, temp, block_size);
/* Encrypt authentication tag. */
for (i = 0; i < ccm_metadata -> nx_crypto_ccm_icv_length; i++)
{
temp[i] = temp[i] ^ icv[i];
}
/* The authentication tag T is the leftmost M bytes of the CBC-MAC value X(t + 1). */
if (NX_CRYPTO_MEMCMP(temp, ccm_metadata -> nx_crypto_ccm_X, ccm_metadata -> nx_crypto_ccm_icv_length))
{
/* Authentication failed. */
return(NX_CRYPTO_AUTHENTICATION_FAILED);
}
}
#ifdef NX_SECURE_KEY_CLEAR
NX_CRYPTO_MEMSET(ccm_metadata, 0, sizeof(NX_CRYPTO_CCM));
#endif
return(NX_CRYPTO_SUCCESS);
}