1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
.. _mozilla_projects_nss_nss_sample_code_nss_sample_code_sample5:
NSS Sample Code sample5
=======================
.. _nss_sample_code_5_pki_encryption_with_a_raw_public_private_key_in_der_format:
`NSS Sample Code 5: PKI Encryption with a raw public & private key in DER format <#nss_sample_code_5_pki_encryption_with_a_raw_public_private_key_in_der_format>`__
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
.. container::
.. code:: notranslate
/* Example code to illustrate PKI crypto ops (encrypt with public key,
* decrypt with private key)
*
* No NSS db needed. The Public Key & Private Key to use are
* sourced from a base64-encoded DER SubjectPublicKeyInfo structure,
* and a base64-encoded DER PrivateKeyInfo structure.
*
* There is no attempt to link the public & private key together
*
* This example does not do any padding. It simply encrypts/decrypts a block
* of length equal to modulus length of the public/private key.
*/
#include "nss.h"
#include "pk11pub.h"
#define BASE64_ENCODED_SUBJECTPUBLICKEYINFO "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAL3F6TIc3JEYsugo+a2fPU3W+Epv/FeIX21DC86WYnpFtW4srFtz2oNUzyLUzDHZdb+k//8dcT3IAOzUUi3R2eMCAwEAAQ=="
#define BASE64_ENCODED_PRIVATEKEYINFO "MIIBVQIBADANBgkqhkiG9w0BAQEFAASCAT8wggE7AgEAAkEAvcXpMhzckRiy6Cj5rZ89Tdb4Sm/8V4hfbUMLzpZiekW1biysW3Pag1TPItTMMdl1v6T//x1xPcgA7NRSLdHZ4wIDAQABAkEAjh8+4qncwcmGivnM6ytbpQT+k/jEOeXG2bQhjojvnXN3FazGCEFXvpuIBcJVfaIJS9YBCMOzzrAtO0+k2hWnOQIhAOC4NVbo8FQhZS4yXM1M86kMl47FA9ui//OUfbhlAdw1AiEA2DBmIXnsboKB+OHver69p0gNeWlvcJc9bjDVfdLVsLcCIQCPtV3vGYJv2vdwxqZQaHC+YB4gIGAqOqBCbmjD3lyFLQIgA+VTYdUNoqwtZWvE4gRf7IzK2V5CCNhg3gR5RGwxN58CIGCcafoRrUKsM66ISg0ITI04G9V/w+wMx91wjEEB+QBz"
int main(int argc, char **argv)
{
SECStatus rv;
CERTCertificate *cert = NULL;
SECKEYPublicKey *pubkey = NULL;
CERTSubjectPublicKeyInfo *spki = NULL;
SECKEYPrivateKey *pvtkey = NULL;
int modulus_len, i, outlen;
char *buf1 = NULL;
char *buf2 = NULL;
char *pubkstr = BASE64_ENCODED_SUBJECTPUBLICKEYINFO;
char *pvtkstr = BASE64_ENCODED_PRIVATEKEYINFO;
SECItem der;
SECItem nickname;
PK11SlotInfo *slot = NULL;
/* Initialize NSS
* You need to explicitly authenticate to the internal token if you use
* NSS_Init insteadf of NSS_NoDB_Init
* Invoke this after getting the internal token handle
* PK11_Authenticate(slot, PR_FALSE, NULL);
*/
rv = NSS_NoDB_Init(".");
if (rv != SECSuccess)
{
fprintf(stderr, "NSS initialization failed (err %d)\n",
PR_GetError());
goto cleanup;
}
/* get internal slot */
slot = PK11_GetInternalKeySlot();
if (slot == NULL)
{
fprintf(stderr, "Couldn't find slot (err %d)\n", PR_GetError());
goto cleanup;
}
rv = ATOB_ConvertAsciiToItem(&der, pubkstr);
if (rv!= SECSuccess)
{
fprintf(stderr, "ATOB_ConvertAsciiToItem failed %d\n", PR_GetError());
goto cleanup;
}
spki = SECKEY_DecodeDERSubjectPublicKeyInfo(&der);
SECITEM_FreeItem(&der, PR_FALSE);
pubkey = SECKEY_ExtractPublicKey(spki);
if (pubkey == NULL)
{
fprintf(stderr, "Couldn't extract public key (err %d)\n", PR_GetError());
goto cleanup;
}
modulus_len = SECKEY_PublicKeyStrength(pubkey);
fprintf(stderr, "Public Key Modulus %d bytes\n", modulus_len);
buf1 = (char *)malloc(modulus_len);
buf2 = (char *)malloc(modulus_len);
/* initialize buf1 */
for (i=0;i<modulus_len;i++)
{
buf1[i]= (i %26) + 'A';
}
buf1[modulus_len-1] = '\0';
fprintf(stderr, "Buffer being encrypted = \n%s\n", buf1);
/* encrypt buf1, result will be in buf2 */
rv = PK11_PubEncryptRaw(pubkey, buf2, buf1, modulus_len, NULL);
if (rv != SECSuccess)
{
fprintf(stderr, "Encrypt with Public Key failed (err %d)\n",
PR_GetError());
goto cleanup;
}
nickname.type = siBuffer;
nickname.data = "pvtkeynickname";
nickname.len = strlen("pvtkeynickname");
rv = ATOB_ConvertAsciiToItem(&der, pvtkstr);
if (rv!= SECSuccess)
{
fprintf(stderr, "ATOB_ConvertAsciiToItem failed %d\n", PR_GetError());
goto cleanup;
}
/* KU_ALL includes a lot of different key usages, KU_DATA_ENCIPHERMENT
* is enough for just RSA encryption.
* publicValue arg (4th) can be NULL for RSA key - I think it is even
* ignored
*/
PK11_ImportDERPrivateKeyInfoAndReturnKey(slot, &der, NULL,
NULL, PR_FALSE, PR_TRUE,
KU_ALL, &pvtkey, NULL);
SECITEM_FreeItem(&der, PR_FALSE);
if (pvtkey == NULL)
{
fprintf(stderr, "Couldn't extract private key (err %d)\n", PR_GetError());
goto cleanup;
}
/* clear buf1 */
for (i=0;i<modulus_len;i++)
{
buf1[i]= '\0';
}
/* decrypt buf2, result will be in buf1 */
rv = PK11_PubDecryptRaw(pvtkey, buf1, &outlen, modulus_len, buf2,
modulus_len);
if (rv != SECSuccess)
{
fprintf(stderr, "Decrypt with Private Key failed (err %d)\n",
PR_GetError());
goto cleanup;
}
fprintf(stderr, "Result of decryption, outlen = %d\n", outlen);
fprintf(stderr, "Result of decryption, buf = \n%s\n", buf1);
cleanup:
if (cert)
CERT_DestroyCertificate(cert);
if (pubkey)
SECKEY_DestroyPublicKey(pubkey);
if (pvtkey)
SECKEY_DestroyPrivateKey(pvtkey);
if (spki)
SECKEY_DestroySubjectPublicKeyInfo(spki);
if (slot)
PK11_FreeSlot(slot);
if (buf1)
free(buf1);
if (buf2)
free(buf2);
exit(1);
}
|
