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iot_pkcs11_psa.c
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iot_pkcs11_psa.c
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/*
* Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
* Copyright (c) 2019-2021 Arm Limited. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
/*
* This file is derivative of amazon-freertos\libraries\abstractions\pkcs11\mbedtls
* \iot_pkcs11_mbedtls.c(amazon-freertos commit 74875b1d2)
*/
/**
* @file iot_pkcs11_psa.c
* @brief PSA based PKCS#11 implementation.
*/
/* C runtime includes. */
#include <stdio.h>
#include <string.h>
/* FreeRTOS includes. */
#include "FreeRTOS.h"
#define MBEDTLS_ALLOW_PRIVATE_ACCESS
/* PKCS#11 includes. */
#include "core_pkcs11_config.h"
#include "core_pkcs11.h"
#include "iot_pkcs11_psa_object_management.h"
#include "iot_pkcs11_psa_input_format.h"
/* mbedTLS includes. */
#include "mbedtls/pk.h"
#define PKCS11_PRINT( X ) vLoggingPrintf X
#define PKCS11_WARNING_PRINT( X ) /* vLoggingPrintf X */
#define pkcs11NO_OPERATION ( ( CK_MECHANISM_TYPE ) 0xFFFFFFFFUL )
/*
* The length of the content of an ECPoint n uncompressed
* representation format defined by SEC1 §2.3.3.
*/
#define pkcs11KEY_ECPOINT_LENGTH ( 65 )
/**
* @brief Cryptoki module attribute definitions.
*/
#define pkcs11SLOT_ID ( 1 )
/* Private defines for checking that attribute templates are complete. */
#define LABEL_IN_TEMPLATE ( 1U )
#define PRIVATE_IN_TEMPLATE ( 1U << 1 )
#define SIGN_IN_TEMPLATE ( 1U << 2 )
#define EC_PARAMS_IN_TEMPLATE ( 1U << 3 )
#define VERIFY_IN_TEMPLATE ( 1U << 4 )
/**
* @brief Helper definitions.
*/
#define PKCS11_MODULE_IS_INITIALIZED ( ( xP11Context.xIsInitialized == CK_TRUE ) ? CK_TRUE : CK_FALSE )
#define PKCS11_SESSION_IS_OPEN( xSessionHandle ) ( ( ( ( P11SessionPtr_t ) xSessionHandle )->xOpened ) == CK_TRUE ? CKR_OK : CKR_SESSION_CLOSED )
#define PKCS11_SESSION_IS_VALID( xSessionHandle ) ( ( ( P11SessionPtr_t ) xSessionHandle != NULL ) ? PKCS11_SESSION_IS_OPEN( xSessionHandle ) : CKR_SESSION_HANDLE_INVALID )
#define PKCS11_SESSION_VALID_AND_MODULE_INITIALIZED( xSessionHandle ) ( PKCS11_MODULE_IS_INITIALIZED ? PKCS11_SESSION_IS_VALID( xSessionHandle ) : CKR_CRYPTOKI_NOT_INITIALIZED )
typedef struct P11Object_t
{
CK_OBJECT_HANDLE xHandle; /* The "PSA Handle". */
CK_BYTE xLabel[ pkcs11configMAX_LABEL_LENGTH + 1 ]; /* Plus 1 for the null terminator. */
} P11Object_t;
/* This structure helps the aws_pkcs11_psa.c maintain a mapping of all objects in one place.
* The ObjectList maintains a list of what object handles are available.
*/
typedef struct P11ObjectList_t
{
SemaphoreHandle_t xMutex; /* Mutex that protects write operations to the xObjects array. */
P11Object_t xObjects[ pkcs11configMAX_NUM_OBJECTS ];
} P11ObjectList_t;
/* PKCS #11 Module Object */
typedef struct P11Struct_t
{
CK_BBOOL xIsInitialized; /* Indicates whether PKCS #11 module has been initialized with a call to C_Initialize. */
P11ObjectList_t xObjectList; /* List of PKCS #11 objects that have been found/created since module initialization.
* The array position indicates the "App Handle" */
} P11Struct_t, * P11Context_t;
/* The global PKCS #11 module object.
* Entropy/randomness and object lists are shared across PKCS #11 sessions. */
static P11Struct_t xP11Context;
/**
* @brief Session structure.
*/
typedef struct P11Session
{
CK_ULONG ulState;
CK_BBOOL xOpened;
CK_MECHANISM_TYPE xOperationInProgress;
CK_BBOOL xFindObjectInit;
CK_BYTE * pxFindObjectLabel;
uint8_t xFindObjectLabelLength;
SemaphoreHandle_t xVerifyMutex; /* Protects the verification key from being modified while in use. */
psa_key_handle_t uxVerifyKey;
CK_MECHANISM_TYPE xVerifyMechanism; /* The mechanism of verify operation in progress. Set during C_VerifyInit. */
psa_algorithm_t xVerifyAlgorithm; /* Verify algorithm that is compatible with the type of key. */
SemaphoreHandle_t xSignMutex; /* Protects the signing key from being modified while in use. */
psa_key_handle_t uxSignKey;
CK_MECHANISM_TYPE xSignMechanism; /* Mechanism of the sign operation in progress. Set during C_SignInit. */
psa_algorithm_t xSignAlgorithm; /* Signature algorithm that is compatible with the type of key. */
psa_hash_operation_t *pxHashOperationHandle; /* hash operation handle in PSA crypto service. */
} P11Session_t, * P11SessionPtr_t;
/*
* PKCS#11 module implementation.
*/
/**
* @brief PKCS#11 interface functions implemented by this Cryptoki module.
*/
static CK_FUNCTION_LIST prvP11FunctionList =
{
{ CRYPTOKI_VERSION_MAJOR, CRYPTOKI_VERSION_MINOR },
C_Initialize,
C_Finalize,
NULL, /*C_GetInfo */
C_GetFunctionList,
C_GetSlotList,
NULL, /*C_GetSlotInfo*/
C_GetTokenInfo,
NULL, /*C_GetMechanismList*/
C_GetMechanismInfo,
C_InitToken,
NULL, /*C_InitPIN*/
NULL, /*C_SetPIN*/
C_OpenSession,
C_CloseSession,
NULL, /*C_CloseAllSessions*/
NULL, /*C_GetSessionInfo*/
NULL, /*C_GetOperationState*/
NULL, /*C_SetOperationState*/
C_Login, /*C_Login*/
NULL, /*C_Logout*/
C_CreateObject,
NULL, /*C_CopyObject*/
C_DestroyObject,
NULL, /*C_GetObjectSize*/
C_GetAttributeValue,
NULL, /*C_SetAttributeValue*/
C_FindObjectsInit,
C_FindObjects,
C_FindObjectsFinal,
NULL, /*C_EncryptInit*/
NULL, /*C_Encrypt*/
NULL, /*C_EncryptUpdate*/
NULL, /*C_EncryptFinal*/
NULL, /*C_DecryptInit*/
NULL, /*C_Decrypt*/
NULL, /*C_DecryptUpdate*/
NULL, /*C_DecryptFinal*/
C_DigestInit,
NULL, /*C_Digest*/
C_DigestUpdate,
NULL, /* C_DigestKey*/
C_DigestFinal,
C_SignInit,
C_Sign,
NULL, /*C_SignUpdate*/
NULL, /*C_SignFinal*/
NULL, /*C_SignRecoverInit*/
NULL, /*C_SignRecover*/
C_VerifyInit,
C_Verify,
NULL, /*C_VerifyUpdate*/
NULL, /*C_VerifyFinal*/
NULL, /*C_VerifyRecoverInit*/
NULL, /*C_VerifyRecover*/
NULL, /*C_DigestEncryptUpdate*/
NULL, /*C_DecryptDigestUpdate*/
NULL, /*C_SignEncryptUpdate*/
NULL, /*C_DecryptVerifyUpdate*/
NULL, /*C_GenerateKey*/
C_GenerateKeyPair,
NULL, /*C_WrapKey*/
NULL, /*C_UnwrapKey*/
NULL, /*C_DeriveKey*/
NULL, /*C_SeedRandom*/
C_GenerateRandom,
NULL, /*C_GetFunctionStatus*/
NULL, /*C_CancelFunction*/
NULL /*C_WaitForSlotEvent*/
};
/*-----------------------------------------------------------*/
/**
* @brief Maps an opaque caller session handle into its internal state structure.
*/
P11SessionPtr_t prvSessionPointerFromHandle( CK_SESSION_HANDLE xSession )
{
return ( P11SessionPtr_t ) xSession; /*lint !e923 Allow casting integer type to pointer for handle. */
}
/**
* @brief Add an object that exists in NVM to the application object array.
*
* @param[in[ xPalHandle The handle used by the PKCS #11 PAL for object.
* @param[out] pxAppHandle Updated to contain the application handle corresponding to xPalHandle.
* @param[in] pcLabel Pointer to object label.
* @param[in] xLabelLength Length of the PKCS #11 label.
*
*/
CK_RV prvAddObjectToList( CK_OBJECT_HANDLE xPalHandle,
CK_OBJECT_HANDLE_PTR pxAppHandle,
uint8_t * pcLabel,
size_t xLabelLength )
{
CK_RV xResult = CKR_OK;
BaseType_t xGotSemaphore;
CK_BBOOL xObjectFound = CK_FALSE;
int lInsertIndex = -1;
int lSearchIndex = pkcs11configMAX_NUM_OBJECTS - 1;
xGotSemaphore = xSemaphoreTake( xP11Context.xObjectList.xMutex, portMAX_DELAY );
if( xGotSemaphore == pdTRUE )
{
for( lSearchIndex = pkcs11configMAX_NUM_OBJECTS - 1; lSearchIndex >= 0; lSearchIndex-- )
{
if( xP11Context.xObjectList.xObjects[ lSearchIndex ].xHandle == xPalHandle )
{
/* Object already exists in list. */
xObjectFound = CK_TRUE;
/* Assign the object handle. */
*pxAppHandle = lSearchIndex + 1;
break;
}
else if( xP11Context.xObjectList.xObjects[ lSearchIndex ].xHandle == CK_INVALID_HANDLE )
{
lInsertIndex = lSearchIndex;
}
}
if( xObjectFound == CK_FALSE )
{
if( lInsertIndex != -1 )
{
if( xLabelLength < pkcs11configMAX_LABEL_LENGTH )
{
xP11Context.xObjectList.xObjects[ lInsertIndex ].xHandle = xPalHandle;
memcpy( xP11Context.xObjectList.xObjects[ lInsertIndex ].xLabel, pcLabel, xLabelLength );
*pxAppHandle = lInsertIndex + 1;
}
else
{
xResult = CKR_DATA_LEN_RANGE;
}
}
else
{
xResult = CKR_BUFFER_TOO_SMALL;
}
}
xSemaphoreGive( xP11Context.xObjectList.xMutex );
}
else
{
xResult = CKR_CANT_LOCK;
}
return xResult;
}
/**
* @brief Looks up a PKCS #11 object's label and PAL handle given an application handle.
*
* @param[in] xAppHandle The handle of the object being lookedup for, used by the application.
* @param[out] xPalHandle Pointer to the handle corresponding to xPalHandle being used by the PAL.
* @param[out] ppcLabel Pointer to an array containing label. NULL if object not found.
* @param[out] pxLabelLength Pointer to label length (includes a string null terminator).
* 0 if no object found.
*/
void prvFindObjectInListByHandle( CK_OBJECT_HANDLE xAppHandle,
CK_OBJECT_HANDLE_PTR pxPalHandle,
uint8_t ** ppcLabel,
size_t * pxLabelLength )
{
int lIndex = xAppHandle - 1;
*ppcLabel = NULL;
*pxLabelLength = 0;
*pxPalHandle = CK_INVALID_HANDLE;
if( lIndex < pkcs11configMAX_NUM_OBJECTS ) /* Check that handle is in bounds. */
{
if( xP11Context.xObjectList.xObjects[ lIndex ].xHandle != CK_INVALID_HANDLE )
{
*ppcLabel = xP11Context.xObjectList.xObjects[ lIndex ].xLabel;
*pxLabelLength = strlen( ( const char * ) xP11Context.xObjectList.xObjects[ lIndex ].xLabel ) + 1;
*pxPalHandle = xP11Context.xObjectList.xObjects[ lIndex ].xHandle;
}
}
}
/**
* @brief Searches the PKCS #11 module's object list for label and provides handle.
*
* @param[in] pcLabel Array containing label.
* @param[in] xLableLength Length of the label, in bytes.
* @param[out] pxPalHandle Pointer to the PAL handle to be provided.
* CK_INVALID_HANDLE if no object found.
* @param[out] pxAppHandle Pointer to the application handle to be provided.
* CK_INVALID_HANDLE if no object found.
*/
void prvFindObjectInListByLabel( uint8_t * pcLabel,
size_t xLabelLength,
CK_OBJECT_HANDLE_PTR pxPalHandle,
CK_OBJECT_HANDLE_PTR pxAppHandle )
{
uint8_t ucIndex;
*pxPalHandle = CK_INVALID_HANDLE;
*pxAppHandle = CK_INVALID_HANDLE;
for( ucIndex = 0; ucIndex < pkcs11configMAX_NUM_OBJECTS; ucIndex++ )
{
if( 0 == memcmp( pcLabel, xP11Context.xObjectList.xObjects[ ucIndex ].xLabel, xLabelLength ) )
{
*pxPalHandle = xP11Context.xObjectList.xObjects[ ucIndex ].xHandle;
*pxAppHandle = ucIndex + 1; /* Zero is not a valid handle, so let's offset by 1. */
break;
}
}
}
/**
* @brief This function is not implemented for this port.
*
* C_Login() is only implemented for compatibility with other ports.
* All inputs to this function are ignored, and calling this
* function on this port does not add any security.
*
* @return CKR_OK.
*/
CK_DECLARE_FUNCTION( CK_RV, C_Login )( CK_SESSION_HANDLE hSession,
CK_USER_TYPE userType,
CK_UTF8CHAR_PTR pPin,
CK_ULONG ulPinLen )
{
/* Avoid warnings about unused parameters. */
( void ) hSession;
( void ) userType;
( void ) pPin;
( void ) ulPinLen;
return CKR_OK;
}
/* Helper function for parsing the templates of device certificates for
* C_CreateObject. */
CK_RV prvCreateCertificate( CK_ATTRIBUTE_PTR pxTemplate,
CK_ULONG ulCount,
CK_OBJECT_HANDLE_PTR pxObject )
{
CK_RV xResult = CKR_OK;
CK_BYTE_PTR pxCertificateValue = NULL;
CK_ULONG xCertificateLength = 0;
CK_ATTRIBUTE_PTR pxLabel = NULL;
CK_ATTRIBUTE_PTR pxClass = NULL;
CK_OBJECT_HANDLE xPalHandle = CK_INVALID_HANDLE;
CK_CERTIFICATE_TYPE xCertificateType = 0; /* = CKC_X_509; */
uint32_t ulIndex = 0;
CK_BBOOL xBool = CK_FALSE;
CK_ATTRIBUTE xAttribute;
/* Search for the pointer to the certificate VALUE. */
for( ulIndex = 0; ulIndex < ulCount; ulIndex++ )
{
xAttribute = pxTemplate[ ulIndex ];
switch( xAttribute.type )
{
case ( CKA_VALUE ):
pxCertificateValue = xAttribute.pValue;
xCertificateLength = xAttribute.ulValueLen;
break;
case ( CKA_LABEL ):
if( xAttribute.ulValueLen <= pkcs11configMAX_LABEL_LENGTH )
{
pxLabel = &pxTemplate[ ulIndex ];
}
else
{
xResult = CKR_DATA_LEN_RANGE;
}
break;
case ( CKA_CERTIFICATE_TYPE ):
memcpy( &xCertificateType, xAttribute.pValue, sizeof( CK_CERTIFICATE_TYPE ) );
if( xCertificateType != CKC_X_509 )
{
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
}
break;
case ( CKA_TOKEN ):
memcpy( &xBool, xAttribute.pValue, sizeof( CK_BBOOL ) );
if( xBool != CK_TRUE )
{
PKCS11_PRINT( ( "ERROR: Only token key object is supported. \r\n" ) );
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
}
break;
case ( CKA_CLASS ):
pxClass = &pxTemplate[ ulIndex ];
break;
case ( CKA_SUBJECT ):
/* Do nothing. This was already parsed out of the template previously. */
break;
default:
xResult = CKR_TEMPLATE_INCONSISTENT;
break;
}
}
if( ( pxCertificateValue == NULL ) || ( pxLabel == NULL ) )
{
xResult = CKR_TEMPLATE_INCOMPLETE;
}
if( xResult == CKR_OK )
{
xPalHandle = PKCS11PSASaveObject( pxClass, pxLabel, pxCertificateValue, xCertificateLength, NULL );
if( xPalHandle == 0 ) /*Invalid handle. */
{
xResult = CKR_DEVICE_MEMORY;
}
}
if( xResult == CKR_OK )
{
/* If adding the object to the list fails, an error will be returned. In this case, remain the
* saved object in PSA as the object list as well as the PSA secure storage will be searched when
* finding an object in C_findobjects.
*/
xResult = prvAddObjectToList( xPalHandle, pxObject, pxLabel->pValue, pxLabel->ulValueLen );
}
return xResult;
}
#define PKCS11_INVALID_KEY_TYPE ( ( CK_KEY_TYPE ) 0xFFFFFFFF )
/* Helper to search an attribute for the key type attribute. */
void prvGetKeyType( CK_KEY_TYPE * pxKeyType,
CK_ATTRIBUTE_PTR pxTemplate,
CK_ULONG ulCount )
{
uint32_t ulIndex;
CK_ATTRIBUTE xAttribute;
*pxKeyType = PKCS11_INVALID_KEY_TYPE;
for( ulIndex = 0; ulIndex < ulCount; ulIndex++ )
{
xAttribute = pxTemplate[ ulIndex ];
if( xAttribute.type == CKA_KEY_TYPE )
{
memcpy( pxKeyType, xAttribute.pValue, sizeof( CK_KEY_TYPE ) );
break;
}
}
}
/* Helper to search a template for the label attribute. */
void prvGetLabel( CK_ATTRIBUTE_PTR * ppxLabel,
CK_ATTRIBUTE_PTR pxTemplate,
CK_ULONG ulCount )
{
CK_ATTRIBUTE xAttribute;
uint32_t ulIndex;
*ppxLabel = NULL;
for( ulIndex = 0; ulIndex < ulCount; ulIndex++ )
{
xAttribute = pxTemplate[ ulIndex ];
if( xAttribute.type == CKA_LABEL )
{
*ppxLabel = &pxTemplate[ ulIndex ];
break;
}
}
}
/* Helper function for checking attribute templates of elliptic curve
* private keys before import with C_CreateObject. */
CK_RV prvCreateEcPrivateKey( mbedtls_pk_context * pxMbedContext,
CK_ATTRIBUTE_PTR * ppxLabel,
CK_ATTRIBUTE_PTR * ppxClass,
CK_ATTRIBUTE_PTR pxTemplate,
CK_ULONG ulCount,
CK_OBJECT_HANDLE_PTR pxObject )
{
CK_RV xResult = CKR_OK;
int lMbedReturn;
CK_BBOOL xBool;
uint32_t ulIndex;
CK_ATTRIBUTE xAttribute;
*ppxLabel = NULL;
*ppxClass = NULL;
/* Key will be assembled in the mbedTLS key context and then exported to DER for storage. */
mbedtls_ecp_keypair * pxKeyPair = ( mbedtls_ecp_keypair * ) pxMbedContext->pk_ctx;
for( ulIndex = 0; ulIndex < ulCount; ulIndex++ )
{
xAttribute = pxTemplate[ ulIndex ];
switch( xAttribute.type )
{
case ( CKA_CLASS ):
*ppxClass = &pxTemplate[ ulIndex ];
break;
case ( CKA_KEY_TYPE ):
/* Do nothing.
* Key type and object type were checked previously. */
break;
case ( CKA_TOKEN ):
memcpy( &xBool, xAttribute.pValue, sizeof( CK_BBOOL ) );
if( xBool != CK_TRUE )
{
PKCS11_PRINT( ( "ERROR: Only token key creation is supported. \r\n" ) );
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
}
break;
case ( CKA_SIGN ):
memcpy( &xBool, xAttribute.pValue, sizeof( CK_BBOOL ) );
if( xBool != CK_TRUE )
{
PKCS11_PRINT( ( "ERROR: Only keys with signing priveledges are supported. \r\n" ) );
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
}
break;
case ( CKA_LABEL ):
if( xAttribute.ulValueLen <= pkcs11configMAX_LABEL_LENGTH )
{
*ppxLabel = &pxTemplate[ ulIndex ];
}
else
{
xResult = CKR_DATA_LEN_RANGE;
}
break;
case ( CKA_EC_PARAMS ):
if( memcmp( ( CK_BYTE[] ) pkcs11DER_ENCODED_OID_P256, xAttribute.pValue, xAttribute.ulValueLen ) )
{
PKCS11_PRINT( ( "ERROR: Only elliptic curve P-256 is supported.\r\n" ) );
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
}
break;
case ( CKA_VALUE ):
lMbedReturn = mbedtls_mpi_read_binary( &pxKeyPair->d,
xAttribute.pValue,
xAttribute.ulValueLen );
if( lMbedReturn != 0 )
{
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
}
break;
default:
xResult = CKR_TEMPLATE_INCONSISTENT;
break;
}
}
return xResult;
}
/* Helper function for parsing RSA Private Key attribute templates
* for C_CreateObject. */
CK_RV prvCreateRsaPrivateKey( mbedtls_pk_context * pxMbedContext,
CK_ATTRIBUTE_PTR * ppxLabel,
CK_ATTRIBUTE_PTR * ppxClass,
CK_ATTRIBUTE_PTR pxTemplate,
CK_ULONG ulCount,
CK_OBJECT_HANDLE_PTR pxObject )
{
CK_RV xResult = CKR_OK;
mbedtls_rsa_context * pxRsaContext;
int lMbedReturn = 0;
CK_BBOOL xBool;
uint32_t ulIndex;
CK_ATTRIBUTE xAttribute;
*ppxLabel = NULL;
*ppxClass = NULL;
pxRsaContext = pxMbedContext->pk_ctx;
mbedtls_rsa_init( pxRsaContext );
/* Parse template and collect the relevant parts. */
for( ulIndex = 0; ulIndex < ulCount; ulIndex++ )
{
xAttribute = pxTemplate[ ulIndex ];
switch( xAttribute.type )
{
case ( CKA_CLASS ):
*ppxClass = &pxTemplate[ ulIndex ];
break;
case ( CKA_KEY_TYPE ):
/* Do nothing.
* Key type & object type were checked previously.
*/
break;
case ( CKA_TOKEN ):
memcpy( &xBool, xAttribute.pValue, sizeof( CK_BBOOL ) );
if( xBool != CK_TRUE )
{
PKCS11_PRINT( ( "ERROR: Only token key creation is supported. \r\n" ) );
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
}
break;
case ( CKA_LABEL ):
if( xAttribute.ulValueLen <= pkcs11configMAX_LABEL_LENGTH )
{
*ppxLabel = &pxTemplate[ ulIndex ];
}
else
{
xResult = CKR_DATA_LEN_RANGE;
}
break;
case ( CKA_SIGN ):
memcpy( &xBool, xAttribute.pValue, xAttribute.ulValueLen );
if( xBool != CK_TRUE )
{
PKCS11_PRINT( ( "Only RSA private keys with signing permissions supported. \r\n" ) );
xResult = CKR_TEMPLATE_INCONSISTENT;
}
break;
case ( CKA_MODULUS ):
lMbedReturn = mbedtls_rsa_import_raw( pxRsaContext,
xAttribute.pValue, xAttribute.ulValueLen, /* N */
NULL, 0, /* P */
NULL, 0, /* Q */
NULL, 0, /* D */
NULL, 0 ); /* E */
break;
case ( CKA_PUBLIC_EXPONENT ):
lMbedReturn = mbedtls_rsa_import_raw( pxRsaContext,
NULL, 0, /* N */
NULL, 0, /* P */
NULL, 0, /* Q */
NULL, 0, /* D */
xAttribute.pValue, xAttribute.ulValueLen ); /* E */
break;
case ( CKA_PRIME_1 ):
lMbedReturn = mbedtls_rsa_import_raw( pxRsaContext,
NULL, 0, /* N */
xAttribute.pValue, xAttribute.ulValueLen, /* P */
NULL, 0, /* Q */
NULL, 0, /* D */
NULL, 0 ); /* E */
break;
case ( CKA_PRIME_2 ):
lMbedReturn = mbedtls_rsa_import_raw( pxRsaContext,
NULL, 0, /* N */
NULL, 0, /* P */
xAttribute.pValue, xAttribute.ulValueLen, /* Q */
NULL, 0, /* D */
NULL, 0 ); /* E */
break;
case ( CKA_PRIVATE_EXPONENT ):
lMbedReturn = mbedtls_rsa_import_raw( pxRsaContext,
NULL, 0, /* N */
NULL, 0, /* P */
NULL, 0, /* Q */
xAttribute.pValue, xAttribute.ulValueLen, /* D */
NULL, 0 ); /* E */
break;
case ( CKA_EXPONENT_1 ):
lMbedReturn = mbedtls_mpi_read_binary( &pxRsaContext->DP, xAttribute.pValue, xAttribute.ulValueLen );
break;
case ( CKA_EXPONENT_2 ):
lMbedReturn = mbedtls_mpi_read_binary( &pxRsaContext->DQ, xAttribute.pValue, xAttribute.ulValueLen );
break;
case ( CKA_COEFFICIENT ):
lMbedReturn = mbedtls_mpi_read_binary( &pxRsaContext->QP, xAttribute.pValue, xAttribute.ulValueLen );
break;
default:
PKCS11_PRINT( ( "Unknown attribute found for RSA private key. %d \r\n", xAttribute.type ) );
xResult = CKR_TEMPLATE_INCONSISTENT;
break;
}
if( lMbedReturn != 0 )
{
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
break;
}
}
return xResult;
}
/* Helper function for importing private keys using template
* C_CreateObject. */
CK_RV prvCreatePrivateKey( CK_ATTRIBUTE_PTR pxTemplate,
CK_ULONG ulCount,
CK_OBJECT_HANDLE_PTR pxObject )
{
/*
* RSAPrivateKey ::= SEQUENCE {
* version Version,
* modulus INTEGER, -- n (256 bytes for RSA-2048)
* publicExponent INTEGER, -- e (3 or 4 bytes for RSA-2048)
* privateExponent INTEGER, -- d (about 256 bytes for RSA-2048)
* prime1 INTEGER, -- p (128 bytes for RSA-2048)
* prime2 INTEGER, -- q (128 bytes for RSA-2048)
* exponent1 INTEGER, -- d mod (p-1) (128 bytes for RSA-2048)
* exponent2 INTEGER, -- d mod (q-1) (128 bytes for RSA-2048)
* coefficient INTEGER, -- (inverse of q) mod p (128 bytes for RSA-2048)
* otherPrimeInfos OtherPrimeInfos OPTIONAL
* }
* Besides, when encode the key, some ASN tags are also introduced.
* For RSA-2048, the encoded length should be around 1232 bytes.
*/
#define MAX_PRIVATE_KEY_SIZE 1300
mbedtls_pk_context xMbedContext;
int lDerKeyLength = 0;
int compare = 0;
CK_BYTE_PTR pxDerKey = NULL;
CK_RV xResult = CKR_OK;
CK_KEY_TYPE xKeyType;
CK_ATTRIBUTE_PTR pxLabel = NULL;
CK_ATTRIBUTE_PTR pxClass = NULL;
CK_OBJECT_HANDLE xPalHandle = CK_INVALID_HANDLE;
mbedtls_rsa_context * pxRsaCtx = NULL;
mbedtls_ecp_keypair * pxKeyPair = NULL;
prvGetKeyType( &xKeyType, pxTemplate, ulCount );
mbedtls_pk_init( &xMbedContext );
if( xKeyType == CKK_RSA )
{
/* mbedtls_rsa_context must be malloc'ed to use with mbedtls_pk_free function. */
pxRsaCtx = pvPortMalloc( sizeof( mbedtls_rsa_context ) );
if( pxRsaCtx != NULL )
{
xMbedContext.pk_ctx = pxRsaCtx;
xMbedContext.pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_RSA);
xResult = prvCreateRsaPrivateKey( &xMbedContext,
&pxLabel,
&pxClass,
pxTemplate,
ulCount,
pxObject );
}
else
{
xResult = CKR_HOST_MEMORY;
}
}
#if ( pkcs11configSUPPRESS_ECDSA_MECHANISM != 1 )
else if( xKeyType == CKK_EC ) /* CKK_EC = CKK_ECDSA. */
{
/* Key will be assembled in the mbedTLS key context and then exported to DER for storage. */
prvGetLabel( &pxLabel, pxTemplate, ulCount );
/* An mbedTLS key is comprised of 2 pieces of data- an "info" and a "context".
* Since a valid key was not found by prvGetExistingKeyComponent, we are going to initialize
* the structure so that the mbedTLS structures will look the same as they would if a key
* had been found, minus the public key component. */
/* If a key had been found by prvGetExistingKeyComponent, the keypair context
* would have been malloc'ed. */
pxKeyPair = pvPortMalloc( sizeof( mbedtls_ecp_keypair ) );
if( pxKeyPair != NULL )
{
/* Initialize the info. */
xMbedContext.pk_info = mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY);
/* Initialize the context. */
xMbedContext.pk_ctx = pxKeyPair;
mbedtls_ecp_keypair_init( pxKeyPair );
mbedtls_ecp_group_init( &pxKeyPair->grp );
/*/ * At this time, only P-256 curves are supported. * / */
mbedtls_ecp_group_load( &pxKeyPair->grp, MBEDTLS_ECP_DP_SECP256R1 );
}
else
{
xResult = CKR_HOST_MEMORY;
}
xResult = prvCreateEcPrivateKey( &xMbedContext,
&pxLabel,
&pxClass,
pxTemplate,
ulCount,
pxObject );
}
#endif /* if ( pkcs11configSUPPRESS_ECDSA_MECHANISM != 1 ) */
else
{
xResult = CKR_MECHANISM_INVALID;
}
/* Convert back to DER and save to memory. */
if( xResult == CKR_OK )
{
pxDerKey = pvPortMalloc( MAX_PRIVATE_KEY_SIZE );
if( pxDerKey == NULL )
{
xResult = CKR_HOST_MEMORY;
}
}
if( xResult == CKR_OK )
{
lDerKeyLength = mbedtls_pk_write_key_der( &xMbedContext, pxDerKey, MAX_PRIVATE_KEY_SIZE );
if( lDerKeyLength < 0 )
{
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
}
/* Do not clean up the mbedTLS key context here as it will be used in psa_save_object. */
}
/* Save the object to device NVM. */
if( xResult == CKR_OK )
{
xPalHandle = PKCS11PSASaveObject( pxClass,
pxLabel,
pxDerKey + ( MAX_PRIVATE_KEY_SIZE - lDerKeyLength ),
lDerKeyLength,
&xMbedContext );
if( xPalHandle == 0 )
{
xResult = CKR_DEVICE_MEMORY;
}
mbedtls_pk_free( &xMbedContext );
}
/* Store the PAL handle/label/application handle in lookup. */
if( xResult == CKR_OK )
{
xResult = prvAddObjectToList( xPalHandle, pxObject, pxLabel->pValue, pxLabel->ulValueLen );
}
if( pxDerKey != NULL )
{
vPortFree( pxDerKey );
}
return xResult;
}
/* Helper function for importing elliptic curve public keys from
* template using C_CreateObject. */
CK_RV prvCreateECPublicKey( mbedtls_pk_context * pxMbedContext,
CK_ATTRIBUTE_PTR * ppxLabel,
CK_ATTRIBUTE_PTR *ppxClass,
CK_ATTRIBUTE_PTR pxTemplate,
CK_ULONG ulCount,
CK_OBJECT_HANDLE_PTR pxObject )
{
CK_RV xResult = CKR_OK;
int lMbedReturn;
CK_BBOOL xBool;
uint32_t ulIndex;
CK_ATTRIBUTE xAttribute;
*ppxLabel = NULL;
*ppxClass = NULL;
/* Key will be assembled in the mbedTLS key context and then exported to DER for storage. */
mbedtls_ecp_keypair * pxKeyPair = ( mbedtls_ecp_keypair * ) pxMbedContext->pk_ctx;
for( ulIndex = 0; ulIndex < ulCount; ulIndex++ )
{
xAttribute = pxTemplate[ ulIndex ];
switch( xAttribute.type )
{
case ( CKA_CLASS ):
*ppxClass = &pxTemplate[ ulIndex ];
case ( CKA_KEY_TYPE ):
/* Do nothing.
* Key type and class were checked previously. */
break;
case ( CKA_TOKEN ):
memcpy( &xBool, xAttribute.pValue, sizeof( CK_BBOOL ) );
if( xBool != CK_TRUE )
{
PKCS11_PRINT( ( "ERROR: Only token key creation is supported. \r\n" ) );
xResult = CKR_ATTRIBUTE_VALUE_INVALID;
}
break;
case ( CKA_LABEL ):
if( xAttribute.ulValueLen < pkcs11configMAX_LABEL_LENGTH )
{
*ppxLabel = &pxTemplate[ ulIndex ];
}
else
{
xResult = CKR_DATA_LEN_RANGE;
}
break;
case ( CKA_VERIFY ):
memcpy( &xBool, xAttribute.pValue, xAttribute.ulValueLen );
if( xBool != CK_TRUE )
{
PKCS11_PRINT( ( "Only EC Public Keys with verify permissions supported. \r\n" ) );