1 /*
2 * Copyright (c) 2001-2019, Arm Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6 #include "cc_pal_mem.h"
7 #include "cc_rnd_common.h"
8 #include "cc_ecpki_types.h"
9 #include "cc_ecpki_error.h"
10 #include "cc_ecpki_local.h"
11 #include "pki.h"
12 #include "pka_ec_wrst.h"
13
14 /*************** EcWrstGenKeyPairBase function **************/
15 /**
16 * @brief Generates a pair of private and public keys
17 * in little endian ordinary (non-Montgomery) form using a cofigurable base point.
18 *
19 * The function performs the following:
20 * 1. Checks the validity of all of the function inputs. If one of the received
21 * parameters is not valid, it returns an error.
22 * 2. Cleans buffers and generates random private key.
23 * 3. Calls the low level function PkaEcWrstScalarMult to generate EC public key.
24 * 4. Outputs the user public and private key structures in little endian form.
25 * 5. Cleans temporary buffers.
26 * 6. Exits.
27 *
28 * @return CC_OK On success, otherwise indicates failure
29 */
EcWrstGenKeyPairBase(const CCEcpkiDomain_t * pDomain,const uint32_t ecX[CC_ECPKI_MODUL_MAX_LENGTH_IN_WORDS],const uint32_t ecY[CC_ECPKI_MODUL_MAX_LENGTH_IN_WORDS],CCEcpkiUserPrivKey_t * pUserPrivKey,CCEcpkiUserPublKey_t * pUserPublKey,CCEcpkiKgTempData_t * pTempBuff)30 CEXPORT_C CCError_t EcWrstGenKeyPairBase(const CCEcpkiDomain_t *pDomain,
31 const uint32_t ecX [CC_ECPKI_MODUL_MAX_LENGTH_IN_WORDS],
32 const uint32_t ecY [CC_ECPKI_MODUL_MAX_LENGTH_IN_WORDS],
33 CCEcpkiUserPrivKey_t *pUserPrivKey,
34 CCEcpkiUserPublKey_t *pUserPublKey,
35 CCEcpkiKgTempData_t *pTempBuff)
36 {
37 CCError_t err = CC_OK;
38 CCEcpkiPrivKey_t *pPrivKey;
39 CCEcpkiPublKey_t *pPublKey;
40 uint32_t orderSizeInWords;
41
42 if (pDomain == NULL)
43 return CC_ECPKI_DOMAIN_PTR_ERROR;
44
45 if (pUserPrivKey == NULL)
46 return CC_ECPKI_GEN_KEY_INVALID_PRIVATE_KEY_PTR_ERROR;
47
48 if (pUserPublKey == NULL)
49 return CC_ECPKI_GEN_KEY_INVALID_PUBLIC_KEY_PTR_ERROR;
50
51 if (pTempBuff == NULL)
52 return CC_ECPKI_GEN_KEY_INVALID_TEMP_DATA_PTR_ERROR;
53
54 if (NULL == ecX || NULL == ecY)
55 return CC_ECPKI_INVALID_BASE_POINT_PTR_ERROR;
56
57 /* the pointer to the key database */
58 pPrivKey = (CCEcpkiPrivKey_t *)&pUserPrivKey->PrivKeyDbBuff;
59 pPublKey = (CCEcpkiPublKey_t *)&pUserPublKey->PublKeyDbBuff;
60
61 orderSizeInWords = (pDomain->ordSizeInBits+CC_BITS_IN_32BIT_WORD-1)/CC_BITS_IN_32BIT_WORD;
62
63 /* calculate public key point coordinates */
64 err = PkaEcWrstScalarMult(pDomain,
65 pPrivKey->PrivKey/*scalar*/, orderSizeInWords, /*scalar size*/
66 ecX, ecY, /*in point coordinates*/
67 pPublKey->x, pPublKey->y, /*out point coordinates*/
68 (uint32_t*)pTempBuff);
69 if(err) {
70 err = CC_ECPKI_INTERNAL_ERROR;
71 goto End;
72 }
73
74 if(CC_OK == err) {
75 /* set the EC domain and keys valid tags */
76 CC_PalMemCopy((uint8_t*)&pPrivKey->domain, (uint8_t*)pDomain, sizeof(pPrivKey->domain));
77 pUserPrivKey->valid_tag = CC_ECPKI_PRIV_KEY_VALIDATION_TAG;
78
79 CC_PalMemCopy((uint8_t*)&pPublKey->domain, (uint8_t*)pDomain, sizeof(pPublKey->domain));
80 pUserPublKey->valid_tag = CC_ECPKI_PUBL_KEY_VALIDATION_TAG;
81 return err;
82 }
83
84 End:
85 pUserPrivKey->valid_tag = 0;
86 pUserPublKey->valid_tag = 0;
87 CC_PalMemSet(pPrivKey, 0, sizeof(pPrivKey->PrivKey));
88 CC_PalMemSet(pPublKey, 0, 2*sizeof(pPublKey->x));
89 return err;
90
91 }
92
93 /*************** EcWrstGenKeyPair function **************/
94 /**
95 * @brief Generates a pair of private and public keys
96 * in little endian ordinary (non-Montgomery) form.
97 *
98 * The function performs the following:
99 * 1. Checks the validity of all of the function inputs. If one of the received
100 * parameters is not valid, it returns an error.
101 * 2. Cleans buffers and generates random private key.
102 * 3. Calls the low level function PkaEcWrstScalarMult to generate EC public key.
103 * 4. Outputs the user public and private key structures in little endian form.
104 * 5. Cleans temporary buffers.
105 * 6. Exits.
106 *
107 * @return CC_OK On success, otherwise indicates failure
108 */
EcWrstGenKeyPair(const CCEcpkiDomain_t * pDomain,CCEcpkiUserPrivKey_t * pUserPrivKey,CCEcpkiUserPublKey_t * pUserPublKey,CCEcpkiKgTempData_t * pTempBuff)109 CEXPORT_C CCError_t EcWrstGenKeyPair(const CCEcpkiDomain_t *pDomain, /*!< [in] Pointer to current EC domain.*/
110 CCEcpkiUserPrivKey_t *pUserPrivKey, /*!< [out] Pointer to the generated private key structure.*/
111 CCEcpkiUserPublKey_t *pUserPublKey, /*!< [out] Pointer to the generated public key structure.*/
112 CCEcpkiKgTempData_t *pTempBuff) /*!< [in] Pointer to temporary buffer.*/
113 {
114
115 if (pDomain == NULL)
116 return CC_ECPKI_DOMAIN_PTR_ERROR;
117
118 return EcWrstGenKeyPairBase(pDomain, pDomain->ecGx, pDomain->ecGy, pUserPrivKey, pUserPublKey, pTempBuff);
119
120 }
121
122
123
124
