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gecko/security/nss/lib/softoken/rsawrapr.c

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/*
* PKCS#1 encoding and decoding functions.
* This file is believed to contain no code licensed from other parties.
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* $Id: rsawrapr.c,v 1.11.70.1 2011/04/07 22:54:48 wtc%google.com Exp $ */
#include "blapi.h"
#include "softoken.h"
#include "sechash.h"
#include "lowkeyi.h"
#include "secerr.h"
#define RSA_BLOCK_MIN_PAD_LEN 8
#define RSA_BLOCK_FIRST_OCTET 0x00
#define RSA_BLOCK_PRIVATE0_PAD_OCTET 0x00
#define RSA_BLOCK_PRIVATE_PAD_OCTET 0xff
#define RSA_BLOCK_AFTER_PAD_OCTET 0x00
#define OAEP_SALT_LEN 8
#define OAEP_PAD_LEN 8
#define OAEP_PAD_OCTET 0x00
#define FLAT_BUFSIZE 512 /* bytes to hold flattened SHA1Context. */
static SHA1Context *
SHA1_CloneContext(SHA1Context *original)
{
SHA1Context * clone = NULL;
unsigned char *pBuf;
int sha1ContextSize = SHA1_FlattenSize(original);
SECStatus frv;
unsigned char buf[FLAT_BUFSIZE];
PORT_Assert(sizeof buf >= sha1ContextSize);
if (sizeof buf >= sha1ContextSize) {
pBuf = buf;
} else {
pBuf = PORT_Alloc(sha1ContextSize);
if (!pBuf)
goto done;
}
frv = SHA1_Flatten(original, pBuf);
if (frv == SECSuccess) {
clone = SHA1_Resurrect(pBuf, NULL);
memset(pBuf, 0, sha1ContextSize);
}
done:
if (pBuf != buf)
PORT_Free(pBuf);
return clone;
}
/*
* Modify data by XORing it with a special hash of salt.
*/
static SECStatus
oaep_xor_with_h1(unsigned char *data, unsigned int datalen,
unsigned char *salt, unsigned int saltlen)
{
SHA1Context *sha1cx;
unsigned char *dp, *dataend;
unsigned char end_octet;
sha1cx = SHA1_NewContext();
if (sha1cx == NULL) {
return SECFailure;
}
/*
* Get a hash of salt started; we will use it several times,
* adding in a different end octet (x00, x01, x02, ...).
*/
SHA1_Begin (sha1cx);
SHA1_Update (sha1cx, salt, saltlen);
end_octet = 0;
dp = data;
dataend = data + datalen;
while (dp < dataend) {
SHA1Context *sha1cx_h1;
unsigned int sha1len, sha1off;
unsigned char sha1[SHA1_LENGTH];
/*
* Create hash of (salt || end_octet)
*/
sha1cx_h1 = SHA1_CloneContext (sha1cx);
SHA1_Update (sha1cx_h1, &end_octet, 1);
SHA1_End (sha1cx_h1, sha1, &sha1len, sizeof(sha1));
SHA1_DestroyContext (sha1cx_h1, PR_TRUE);
PORT_Assert (sha1len == SHA1_LENGTH);
/*
* XOR that hash with the data.
* When we have fewer than SHA1_LENGTH octets of data
* left to xor, use just the low-order ones of the hash.
*/
sha1off = 0;
if ((dataend - dp) < SHA1_LENGTH)
sha1off = SHA1_LENGTH - (dataend - dp);
while (sha1off < SHA1_LENGTH)
*dp++ ^= sha1[sha1off++];
/*
* Bump for next hash chunk.
*/
end_octet++;
}
SHA1_DestroyContext (sha1cx, PR_TRUE);
return SECSuccess;
}
/*
* Modify salt by XORing it with a special hash of data.
*/
static SECStatus
oaep_xor_with_h2(unsigned char *salt, unsigned int saltlen,
unsigned char *data, unsigned int datalen)
{
unsigned char sha1[SHA1_LENGTH];
unsigned char *psalt, *psha1, *saltend;
SECStatus rv;
/*
* Create a hash of data.
*/
rv = SHA1_HashBuf (sha1, data, datalen);
if (rv != SECSuccess) {
return rv;
}
/*
* XOR the low-order octets of that hash with salt.
*/
PORT_Assert (saltlen <= SHA1_LENGTH);
saltend = salt + saltlen;
psalt = salt;
psha1 = sha1 + SHA1_LENGTH - saltlen;
while (psalt < saltend) {
*psalt++ ^= *psha1++;
}
return SECSuccess;
}
/*
* Format one block of data for public/private key encryption using
* the rules defined in PKCS #1.
*/
static unsigned char *
rsa_FormatOneBlock(unsigned modulusLen, RSA_BlockType blockType,
SECItem *data)
{
unsigned char *block;
unsigned char *bp;
int padLen;
int i, j;
SECStatus rv;
block = (unsigned char *) PORT_Alloc(modulusLen);
if (block == NULL)
return NULL;
bp = block;
/*
* All RSA blocks start with two octets:
* 0x00 || BlockType
*/
*bp++ = RSA_BLOCK_FIRST_OCTET;
*bp++ = (unsigned char) blockType;
switch (blockType) {
/*
* Blocks intended for private-key operation.
*/
case RSA_BlockPrivate0: /* essentially unused */
case RSA_BlockPrivate: /* preferred method */
/*
* 0x00 || BT || Pad || 0x00 || ActualData
* 1 1 padLen 1 data->len
* Pad is either all 0x00 or all 0xff bytes, depending on blockType.
*/
padLen = modulusLen - data->len - 3;
PORT_Assert (padLen >= RSA_BLOCK_MIN_PAD_LEN);
if (padLen < RSA_BLOCK_MIN_PAD_LEN) {
PORT_Free (block);
return NULL;
}
PORT_Memset (bp,
blockType == RSA_BlockPrivate0
? RSA_BLOCK_PRIVATE0_PAD_OCTET
: RSA_BLOCK_PRIVATE_PAD_OCTET,
padLen);
bp += padLen;
*bp++ = RSA_BLOCK_AFTER_PAD_OCTET;
PORT_Memcpy (bp, data->data, data->len);
break;
/*
* Blocks intended for public-key operation.
*/
case RSA_BlockPublic:
/*
* 0x00 || BT || Pad || 0x00 || ActualData
* 1 1 padLen 1 data->len
* Pad is all non-zero random bytes.
*
* Build the block left to right.
* Fill the entire block from Pad to the end with random bytes.
* Use the bytes after Pad as a supply of extra random bytes from
* which to find replacements for the zero bytes in Pad.
* If we need more than that, refill the bytes after Pad with
* new random bytes as necessary.
*/
padLen = modulusLen - (data->len + 3);
PORT_Assert (padLen >= RSA_BLOCK_MIN_PAD_LEN);
if (padLen < RSA_BLOCK_MIN_PAD_LEN) {
PORT_Free (block);
return NULL;
}
j = modulusLen - 2;
rv = RNG_GenerateGlobalRandomBytes(bp, j);
if (rv == SECSuccess) {
for (i = 0; i < padLen; ) {
unsigned char repl;
/* Pad with non-zero random data. */
if (bp[i] != RSA_BLOCK_AFTER_PAD_OCTET) {
++i;
continue;
}
if (j <= padLen) {
rv = RNG_GenerateGlobalRandomBytes(bp + padLen,
modulusLen - (2 + padLen));
if (rv != SECSuccess)
break;
j = modulusLen - 2;
}
do {
repl = bp[--j];
} while (repl == RSA_BLOCK_AFTER_PAD_OCTET && j > padLen);
if (repl != RSA_BLOCK_AFTER_PAD_OCTET) {
bp[i++] = repl;
}
}
}
if (rv != SECSuccess) {
sftk_fatalError = PR_TRUE;
PORT_Free (block);
return NULL;
}
bp += padLen;
*bp++ = RSA_BLOCK_AFTER_PAD_OCTET;
PORT_Memcpy (bp, data->data, data->len);
break;
/*
* Blocks intended for public-key operation, using
* Optimal Asymmetric Encryption Padding (OAEP).
*/
case RSA_BlockOAEP:
/*
* 0x00 || BT || Modified2(Salt) || Modified1(PaddedData)
* 1 1 OAEP_SALT_LEN OAEP_PAD_LEN + data->len [+ N]
*
* where:
* PaddedData is "Pad1 || ActualData [|| Pad2]"
* Salt is random data.
* Pad1 is all zeros.
* Pad2, if present, is random data.
* (The "modified" fields are all the same length as the original
* unmodified values; they are just xor'd with other values.)
*
* Modified1 is an XOR of PaddedData with a special octet
* string constructed of iterated hashing of Salt (see below).
* Modified2 is an XOR of Salt with the low-order octets of
* the hash of Modified1 (see farther below ;-).
*
* Whew!
*/
/*
* Salt
*/
rv = RNG_GenerateGlobalRandomBytes(bp, OAEP_SALT_LEN);
if (rv != SECSuccess) {
sftk_fatalError = PR_TRUE;
PORT_Free (block);
return NULL;
}
bp += OAEP_SALT_LEN;
/*
* Pad1
*/
PORT_Memset (bp, OAEP_PAD_OCTET, OAEP_PAD_LEN);
bp += OAEP_PAD_LEN;
/*
* Data
*/
PORT_Memcpy (bp, data->data, data->len);
bp += data->len;
/*
* Pad2
*/
if (bp < (block + modulusLen)) {
rv = RNG_GenerateGlobalRandomBytes(bp, block - bp + modulusLen);
if (rv != SECSuccess) {
sftk_fatalError = PR_TRUE;
PORT_Free (block);
return NULL;
}
}
/*
* Now we have the following:
* 0x00 || BT || Salt || PaddedData
* (From this point on, "Pad1 || Data [|| Pad2]" is treated
* as the one entity PaddedData.)
*
* We need to turn PaddedData into Modified1.
*/
if (oaep_xor_with_h1(block + 2 + OAEP_SALT_LEN,
modulusLen - 2 - OAEP_SALT_LEN,
block + 2, OAEP_SALT_LEN) != SECSuccess) {
PORT_Free (block);
return NULL;
}
/*
* Now we have:
* 0x00 || BT || Salt || Modified1(PaddedData)
*
* The remaining task is to turn Salt into Modified2.
*/
if (oaep_xor_with_h2(block + 2, OAEP_SALT_LEN,
block + 2 + OAEP_SALT_LEN,
modulusLen - 2 - OAEP_SALT_LEN) != SECSuccess) {
PORT_Free (block);
return NULL;
}
break;
default:
PORT_Assert (0);
PORT_Free (block);
return NULL;
}
return block;
}
static SECStatus
rsa_FormatBlock(SECItem *result, unsigned modulusLen,
RSA_BlockType blockType, SECItem *data)
{
/*
* XXX For now assume that the data length fits in a single
* XXX encryption block; the ASSERTs below force this.
* XXX To fix it, each case will have to loop over chunks whose
* XXX lengths satisfy the assertions, until all data is handled.
* XXX (Unless RSA has more to say about how to handle data
* XXX which does not fit in a single encryption block?)
* XXX And I do not know what the result is supposed to be,
* XXX so the interface to this function may need to change
* XXX to allow for returning multiple blocks, if they are
* XXX not wanted simply concatenated one after the other.
*/
switch (blockType) {
case RSA_BlockPrivate0:
case RSA_BlockPrivate:
case RSA_BlockPublic:
/*
* 0x00 || BT || Pad || 0x00 || ActualData
*
* The "3" below is the first octet + the second octet + the 0x00
* octet that always comes just before the ActualData.
*/
PORT_Assert (data->len <= (modulusLen - (3 + RSA_BLOCK_MIN_PAD_LEN)));
result->data = rsa_FormatOneBlock(modulusLen, blockType, data);
if (result->data == NULL) {
result->len = 0;
return SECFailure;
}
result->len = modulusLen;
break;
case RSA_BlockOAEP:
/*
* 0x00 || BT || M1(Salt) || M2(Pad1||ActualData[||Pad2])
*
* The "2" below is the first octet + the second octet.
* (The other fields do not contain the clear values, but are
* the same length as the clear values.)
*/
PORT_Assert (data->len <= (modulusLen - (2 + OAEP_SALT_LEN
+ OAEP_PAD_LEN)));
result->data = rsa_FormatOneBlock(modulusLen, blockType, data);
if (result->data == NULL) {
result->len = 0;
return SECFailure;
}
result->len = modulusLen;
break;
case RSA_BlockRaw:
/*
* Pad || ActualData
* Pad is zeros. The application is responsible for recovering
* the actual data.
*/
if (data->len > modulusLen ) {
return SECFailure;
}
result->data = (unsigned char*)PORT_ZAlloc(modulusLen);
result->len = modulusLen;
PORT_Memcpy(result->data+(modulusLen-data->len),data->data,data->len);
break;
default:
PORT_Assert (0);
result->data = NULL;
result->len = 0;
return SECFailure;
}
return SECSuccess;
}
/* XXX Doesn't set error code */
SECStatus
RSA_Sign(NSSLOWKEYPrivateKey *key,
unsigned char * output,
unsigned int * output_len,
unsigned int maxOutputLen,
unsigned char * input,
unsigned int input_len)
{
SECStatus rv = SECSuccess;
unsigned int modulus_len = nsslowkey_PrivateModulusLen(key);
SECItem formatted;
SECItem unformatted;
if (maxOutputLen < modulus_len)
return SECFailure;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
return SECFailure;
unformatted.len = input_len;
unformatted.data = input;
formatted.data = NULL;
rv = rsa_FormatBlock(&formatted, modulus_len, RSA_BlockPrivate,
&unformatted);
if (rv != SECSuccess)
goto done;
rv = RSA_PrivateKeyOpDoubleChecked(&key->u.rsa, output, formatted.data);
if (rv != SECSuccess && PORT_GetError() == SEC_ERROR_LIBRARY_FAILURE) {
sftk_fatalError = PR_TRUE;
}
*output_len = modulus_len;
goto done;
done:
if (formatted.data != NULL)
PORT_ZFree(formatted.data, modulus_len);
return rv;
}
/* XXX Doesn't set error code */
SECStatus
RSA_CheckSign(NSSLOWKEYPublicKey *key,
unsigned char * sign,
unsigned int sign_len,
unsigned char * hash,
unsigned int hash_len)
{
SECStatus rv;
unsigned int modulus_len = nsslowkey_PublicModulusLen(key);
unsigned int i;
unsigned char * buffer;
modulus_len = nsslowkey_PublicModulusLen(key);
if (sign_len != modulus_len)
goto failure;
/*
* 0x00 || BT || Pad || 0x00 || ActualData
*
* The "3" below is the first octet + the second octet + the 0x00
* octet that always comes just before the ActualData.
*/
if (hash_len > modulus_len - (3 + RSA_BLOCK_MIN_PAD_LEN))
goto failure;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
goto failure;
buffer = (unsigned char *)PORT_Alloc(modulus_len + 1);
if (!buffer)
goto failure;
rv = RSA_PublicKeyOp(&key->u.rsa, buffer, sign);
if (rv != SECSuccess)
goto loser;
/*
* check the padding that was used
*/
if (buffer[0] != 0 || buffer[1] != 1)
goto loser;
for (i = 2; i < modulus_len - hash_len - 1; i++) {
if (buffer[i] != 0xff)
goto loser;
}
if (buffer[i] != 0)
goto loser;
/*
* make sure we get the same results
*/
if (PORT_Memcmp(buffer + modulus_len - hash_len, hash, hash_len) != 0)
goto loser;
PORT_Free(buffer);
return SECSuccess;
loser:
PORT_Free(buffer);
failure:
return SECFailure;
}
/* XXX Doesn't set error code */
SECStatus
RSA_CheckSignRecover(NSSLOWKEYPublicKey *key,
unsigned char * data,
unsigned int * data_len,
unsigned int max_output_len,
unsigned char * sign,
unsigned int sign_len)
{
SECStatus rv;
unsigned int modulus_len = nsslowkey_PublicModulusLen(key);
unsigned int i;
unsigned char * buffer;
if (sign_len != modulus_len)
goto failure;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
goto failure;
buffer = (unsigned char *)PORT_Alloc(modulus_len + 1);
if (!buffer)
goto failure;
rv = RSA_PublicKeyOp(&key->u.rsa, buffer, sign);
if (rv != SECSuccess)
goto loser;
*data_len = 0;
/*
* check the padding that was used
*/
if (buffer[0] != 0 || buffer[1] != 1)
goto loser;
for (i = 2; i < modulus_len; i++) {
if (buffer[i] == 0) {
*data_len = modulus_len - i - 1;
break;
}
if (buffer[i] != 0xff)
goto loser;
}
if (*data_len == 0)
goto loser;
if (*data_len > max_output_len)
goto loser;
/*
* make sure we get the same results
*/
PORT_Memcpy(data,buffer + modulus_len - *data_len, *data_len);
PORT_Free(buffer);
return SECSuccess;
loser:
PORT_Free(buffer);
failure:
return SECFailure;
}
/* XXX Doesn't set error code */
SECStatus
RSA_EncryptBlock(NSSLOWKEYPublicKey *key,
unsigned char * output,
unsigned int * output_len,
unsigned int max_output_len,
unsigned char * input,
unsigned int input_len)
{
SECStatus rv;
unsigned int modulus_len = nsslowkey_PublicModulusLen(key);
SECItem formatted;
SECItem unformatted;
formatted.data = NULL;
if (max_output_len < modulus_len)
goto failure;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
goto failure;
unformatted.len = input_len;
unformatted.data = input;
formatted.data = NULL;
rv = rsa_FormatBlock(&formatted, modulus_len, RSA_BlockPublic,
&unformatted);
if (rv != SECSuccess)
goto failure;
rv = RSA_PublicKeyOp(&key->u.rsa, output, formatted.data);
if (rv != SECSuccess)
goto failure;
PORT_ZFree(formatted.data, modulus_len);
*output_len = modulus_len;
return SECSuccess;
failure:
if (formatted.data != NULL)
PORT_ZFree(formatted.data, modulus_len);
return SECFailure;
}
/* XXX Doesn't set error code */
SECStatus
RSA_DecryptBlock(NSSLOWKEYPrivateKey *key,
unsigned char * output,
unsigned int * output_len,
unsigned int max_output_len,
unsigned char * input,
unsigned int input_len)
{
SECStatus rv;
unsigned int modulus_len = nsslowkey_PrivateModulusLen(key);
unsigned int i;
unsigned char * buffer;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
goto failure;
if (input_len != modulus_len)
goto failure;
buffer = (unsigned char *)PORT_Alloc(modulus_len + 1);
if (!buffer)
goto failure;
rv = RSA_PrivateKeyOp(&key->u.rsa, buffer, input);
if (rv != SECSuccess) {
if (PORT_GetError() == SEC_ERROR_LIBRARY_FAILURE) {
sftk_fatalError = PR_TRUE;
}
goto loser;
}
if (buffer[0] != 0 || buffer[1] != 2)
goto loser;
*output_len = 0;
for (i = 2; i < modulus_len; i++) {
if (buffer[i] == 0) {
*output_len = modulus_len - i - 1;
break;
}
}
if (*output_len == 0)
goto loser;
if (*output_len > max_output_len)
goto loser;
PORT_Memcpy(output, buffer + modulus_len - *output_len, *output_len);
PORT_Free(buffer);
return SECSuccess;
loser:
PORT_Free(buffer);
failure:
return SECFailure;
}
/* XXX Doesn't set error code */
/*
* added to make pkcs #11 happy
* RAW is RSA_X_509
*/
SECStatus
RSA_SignRaw(NSSLOWKEYPrivateKey *key,
unsigned char * output,
unsigned int * output_len,
unsigned int maxOutputLen,
unsigned char * input,
unsigned int input_len)
{
SECStatus rv = SECSuccess;
unsigned int modulus_len = nsslowkey_PrivateModulusLen(key);
SECItem formatted;
SECItem unformatted;
if (maxOutputLen < modulus_len)
return SECFailure;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
return SECFailure;
unformatted.len = input_len;
unformatted.data = input;
formatted.data = NULL;
rv = rsa_FormatBlock(&formatted, modulus_len, RSA_BlockRaw, &unformatted);
if (rv != SECSuccess)
goto done;
rv = RSA_PrivateKeyOpDoubleChecked(&key->u.rsa, output, formatted.data);
if (rv != SECSuccess && PORT_GetError() == SEC_ERROR_LIBRARY_FAILURE) {
sftk_fatalError = PR_TRUE;
}
*output_len = modulus_len;
done:
if (formatted.data != NULL)
PORT_ZFree(formatted.data, modulus_len);
return rv;
}
/* XXX Doesn't set error code */
SECStatus
RSA_CheckSignRaw(NSSLOWKEYPublicKey *key,
unsigned char * sign,
unsigned int sign_len,
unsigned char * hash,
unsigned int hash_len)
{
SECStatus rv;
unsigned int modulus_len = nsslowkey_PublicModulusLen(key);
unsigned char * buffer;
if (sign_len != modulus_len)
goto failure;
if (hash_len > modulus_len)
goto failure;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
goto failure;
buffer = (unsigned char *)PORT_Alloc(modulus_len + 1);
if (!buffer)
goto failure;
rv = RSA_PublicKeyOp(&key->u.rsa, buffer, sign);
if (rv != SECSuccess)
goto loser;
/*
* make sure we get the same results
*/
/* NOTE: should we verify the leading zeros? */
if (PORT_Memcmp(buffer + (modulus_len-hash_len), hash, hash_len) != 0)
goto loser;
PORT_Free(buffer);
return SECSuccess;
loser:
PORT_Free(buffer);
failure:
return SECFailure;
}
/* XXX Doesn't set error code */
SECStatus
RSA_CheckSignRecoverRaw(NSSLOWKEYPublicKey *key,
unsigned char * data,
unsigned int * data_len,
unsigned int max_output_len,
unsigned char * sign,
unsigned int sign_len)
{
SECStatus rv;
unsigned int modulus_len = nsslowkey_PublicModulusLen(key);
if (sign_len != modulus_len)
goto failure;
if (max_output_len < modulus_len)
goto failure;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
goto failure;
rv = RSA_PublicKeyOp(&key->u.rsa, data, sign);
if (rv != SECSuccess)
goto failure;
*data_len = modulus_len;
return SECSuccess;
failure:
return SECFailure;
}
/* XXX Doesn't set error code */
SECStatus
RSA_EncryptRaw(NSSLOWKEYPublicKey *key,
unsigned char * output,
unsigned int * output_len,
unsigned int max_output_len,
unsigned char * input,
unsigned int input_len)
{
SECStatus rv;
unsigned int modulus_len = nsslowkey_PublicModulusLen(key);
SECItem formatted;
SECItem unformatted;
formatted.data = NULL;
if (max_output_len < modulus_len)
goto failure;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
goto failure;
unformatted.len = input_len;
unformatted.data = input;
formatted.data = NULL;
rv = rsa_FormatBlock(&formatted, modulus_len, RSA_BlockRaw, &unformatted);
if (rv != SECSuccess)
goto failure;
rv = RSA_PublicKeyOp(&key->u.rsa, output, formatted.data);
if (rv != SECSuccess)
goto failure;
PORT_ZFree(formatted.data, modulus_len);
*output_len = modulus_len;
return SECSuccess;
failure:
if (formatted.data != NULL)
PORT_ZFree(formatted.data, modulus_len);
return SECFailure;
}
/* XXX Doesn't set error code */
SECStatus
RSA_DecryptRaw(NSSLOWKEYPrivateKey *key,
unsigned char * output,
unsigned int * output_len,
unsigned int max_output_len,
unsigned char * input,
unsigned int input_len)
{
SECStatus rv;
unsigned int modulus_len = nsslowkey_PrivateModulusLen(key);
if (modulus_len <= 0)
goto failure;
if (modulus_len > max_output_len)
goto failure;
PORT_Assert(key->keyType == NSSLOWKEYRSAKey);
if (key->keyType != NSSLOWKEYRSAKey)
goto failure;
if (input_len != modulus_len)
goto failure;
rv = RSA_PrivateKeyOp(&key->u.rsa, output, input);
if (rv != SECSuccess) {
if (PORT_GetError() == SEC_ERROR_LIBRARY_FAILURE) {
sftk_fatalError = PR_TRUE;
}
goto failure;
}
*output_len = modulus_len;
return SECSuccess;
failure:
return SECFailure;
}
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