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checkin of blinding implementation

This commit is contained in:
mcgreer%netscape.com 2000-11-17 17:58:35 +00:00
Родитель 01bfb255ae
Коммит 2eb0fe5c6c
1 изменённых файлов: 287 добавлений и 53 удалений
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340
security/nss/lib/freebl/rsa.c
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@ -35,11 +35,14 @@
/* /*
* RSA key generation, public key op, private key op. * RSA key generation, public key op, private key op.
* *
* $Id: rsa.c,v 1.18 2000-10-31 16:52:31 mcgreer%netscape.com Exp $ * $Id: rsa.c,v 1.19 2000-11-17 17:58:35 mcgreer%netscape.com Exp $
*/ */
#include "secerr.h" #include "secerr.h"
#include "prclist.h"
#include "prlock.h"
#include "prinit.h"
#include "blapi.h" #include "blapi.h"
#include "mpi.h" #include "mpi.h"
#include "mpprime.h" #include "mpprime.h"
@ -47,12 +50,51 @@
#include "secitem.h" #include "secitem.h"
/* /*
** RSA encryption/decryption. When encrypting/decrypting the output ** RSABlindingParamsStr
** buffer must be at least the size of the public key modulus. **
** For discussion of Paul Kocher's timing attack against an RSA private key
** operation, see http://www.cryptography.com/timingattack/paper.html. The
** countermeasure to this attack, known as blinding, is also discussed in
** the Handbook of Applied Cryptography, 11.118-11.119.
*/ */
struct RSABlindingParamsStr
{
/* Blinding-specific parameters */
PRCList link; /* link to list of structs */
SECItem modulus; /* list element "key" */
mp_int f, g; /* Blinding parameters */
int counter; /* number of remaining uses of (f, g) */
};
/*
** RSABlindingParamsListStr
**
** List of key-specific blinding params. The arena holds the volatile pool
** of memory for each entry and the list itself. The lock is for list
** operations, in this case insertions and iterations, as well as control
** of the counter for each set of blinding parameters.
*/
struct RSABlindingParamsListStr
{
PRLock *lock; /* Lock for the list */
PRCList head; /* Pointer to the list */
};
/*
** The master blinding params list.
*/
static struct RSABlindingParamsListStr blindingParamsList = { 0 };
/* Number of times to reuse (f, g). Suggested by Paul Kocher */
#define RSA_BLINDING_PARAMS_MAX_REUSE 50
/* Global, allows optional use of blinding. On by default. */
/* Cannot be changed at the moment, due to thread-safety issues. */
static PRBool nssRSAUseBlinding = PR_TRUE;
static SECStatus static SECStatus
rsa_keygen_from_primes(mp_int *p, mp_int *q, mp_int *e, RSAPrivateKey *key) rsa_keygen_from_primes(mp_int *p, mp_int *q, mp_int *e, RSAPrivateKey *key,
unsigned int keySizeInBits)
{ {
mp_int n, d, phi; mp_int n, d, phi;
mp_int psub1, qsub1, tmp; mp_int psub1, qsub1, tmp;
@ -72,11 +114,17 @@ rsa_keygen_from_primes(mp_int *p, mp_int *q, mp_int *e, RSAPrivateKey *key)
CHECK_MPI_OK( mp_init(&tmp) ); CHECK_MPI_OK( mp_init(&tmp) );
/* 1. Compute n = p*q */ /* 1. Compute n = p*q */
CHECK_MPI_OK( mp_mul(p, q, &n) ); CHECK_MPI_OK( mp_mul(p, q, &n) );
/* verify that the modulus has the desired number of bits */
if (mpl_significant_bits(&n) != keySizeInBits) {
PORT_SetError(SEC_ERROR_NEED_RANDOM);
rv = SECFailure;
goto cleanup;
}
/* 2. Compute phi = (p-1)*(q-1) */ /* 2. Compute phi = (p-1)*(q-1) */
CHECK_MPI_OK( mp_sub_d(p, 1, &psub1) ); CHECK_MPI_OK( mp_sub_d(p, 1, &psub1) );
CHECK_MPI_OK( mp_sub_d(q, 1, &qsub1) ); CHECK_MPI_OK( mp_sub_d(q, 1, &qsub1) );
CHECK_MPI_OK( mp_mul(&psub1, &qsub1, &phi) ); CHECK_MPI_OK( mp_mul(&psub1, &qsub1, &phi) );
/* 3. Compute d = e**-1 mod(phi) using extended Euclidean algorithm */ /* 3. Compute d = e**-1 mod(phi) */
err = mp_invmod(e, &phi, &d); err = mp_invmod(e, &phi, &d);
/* Verify that phi(n) and e have no common divisors */ /* Verify that phi(n) and e have no common divisors */
if (err != MP_OKAY) { if (err != MP_OKAY) {
@ -169,7 +217,12 @@ RSA_NewKey(int keySizeInBits, SECItem *publicExponent)
/* 4. Generate primes p and q */ /* 4. Generate primes p and q */
pb = PORT_Alloc(primeLen); pb = PORT_Alloc(primeLen);
qb = PORT_Alloc(primeLen); qb = PORT_Alloc(primeLen);
if (!pb || !qb) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
goto cleanup;
}
do { do {
PORT_SetError(0);
CHECK_SEC_OK( RNG_GenerateGlobalRandomBytes(pb, primeLen) ); CHECK_SEC_OK( RNG_GenerateGlobalRandomBytes(pb, primeLen) );
CHECK_SEC_OK( RNG_GenerateGlobalRandomBytes(qb, primeLen) ); CHECK_SEC_OK( RNG_GenerateGlobalRandomBytes(qb, primeLen) );
pb[0] |= 0xC0; /* set two high-order bits */ pb[0] |= 0xC0; /* set two high-order bits */
@ -182,7 +235,7 @@ RSA_NewKey(int keySizeInBits, SECItem *publicExponent)
CHECK_MPI_OK( mpp_make_prime(&q, primeLen * 8, PR_FALSE, &counter) ); CHECK_MPI_OK( mpp_make_prime(&q, primeLen * 8, PR_FALSE, &counter) );
if (mp_cmp(&p, &q) < 0) if (mp_cmp(&p, &q) < 0)
mp_exch(&p, &q); mp_exch(&p, &q);
rv = rsa_keygen_from_primes(&p, &q, &e, key); rv = rsa_keygen_from_primes(&p, &q, &e, key, keySizeInBits);
if (rv == SECSuccess) if (rv == SECSuccess)
break; /* generated two good primes */ break; /* generated two good primes */
prerr = PORT_GetError(); prerr = PORT_GetError();
@ -274,38 +327,19 @@ cleanup:
** RSA Private key operation (no CRT). ** RSA Private key operation (no CRT).
*/ */
static SECStatus static SECStatus
rsa_PrivateKeyOp(RSAPrivateKey *key, rsa_PrivateKeyOp(RSAPrivateKey *key, mp_int *m, mp_int *c, mp_int *n,
unsigned char *output, unsigned int modLen)
unsigned char *input)
{ {
mp_int n, d, m, c; mp_int d;
mp_err err = MP_OKAY; mp_err err = MP_OKAY;
SECStatus rv = SECSuccess; SECStatus rv = SECSuccess;
unsigned int modLen;
modLen = rsa_modulusLen(&key->modulus);
MP_DIGITS(&n) = 0;
MP_DIGITS(&d) = 0; MP_DIGITS(&d) = 0;
MP_DIGITS(&m) = 0;
MP_DIGITS(&c) = 0;
CHECK_MPI_OK( mp_init(&n) );
CHECK_MPI_OK( mp_init(&d) ); CHECK_MPI_OK( mp_init(&d) );
CHECK_MPI_OK( mp_init(&m) ); SECITEM_TO_MPINT(key->privateExponent, &d);
CHECK_MPI_OK( mp_init(&c) );
/* copy private key parameters into mp integers */
SECITEM_TO_MPINT(key->modulus, &n); /* n */
SECITEM_TO_MPINT(key->privateExponent, &d); /* d */
/* copy input into mp integer c */
OCTETS_TO_MPINT(input, &c, modLen);
/* 1. m = c**d mod n */ /* 1. m = c**d mod n */
CHECK_MPI_OK( mp_exptmod(&c, &d, &n, &m) ); CHECK_MPI_OK( mp_exptmod(c, &d, n, m) );
/* m is the output */
err = mp_to_fixlen_octets(&m, output, modLen);
if (err >= 0) err = MP_OKAY;
cleanup: cleanup:
mp_clear(&n);
mp_clear(&d); mp_clear(&d);
mp_clear(&m);
mp_clear(&c);
if (err) { if (err) {
MP_TO_SEC_ERROR(err); MP_TO_SEC_ERROR(err);
rv = SECFailure; rv = SECFailure;
@ -317,39 +351,32 @@ cleanup:
** RSA Private key operation using CRT. ** RSA Private key operation using CRT.
*/ */
static SECStatus static SECStatus
rsa_PrivateKeyOpCRT(RSAPrivateKey *key, rsa_PrivateKeyOpCRT(RSAPrivateKey *key, mp_int *m, mp_int *c,
unsigned char *output, unsigned int modLen)
unsigned char *input)
{ {
mp_int p, q, d_p, d_q, qInv; mp_int p, q, d_p, d_q, qInv;
mp_int m, m1, m2, b2, h, c, ctmp; mp_int m1, m2, b2, h, ctmp;
mp_err err = MP_OKAY; mp_err err = MP_OKAY;
SECStatus rv = SECSuccess; SECStatus rv = SECSuccess;
unsigned int modLen;
modLen = rsa_modulusLen(&key->modulus);
MP_DIGITS(&p) = 0; MP_DIGITS(&p) = 0;
MP_DIGITS(&q) = 0; MP_DIGITS(&q) = 0;
MP_DIGITS(&d_p) = 0; MP_DIGITS(&d_p) = 0;
MP_DIGITS(&d_q) = 0; MP_DIGITS(&d_q) = 0;
MP_DIGITS(&qInv) = 0; MP_DIGITS(&qInv) = 0;
MP_DIGITS(&m) = 0;
MP_DIGITS(&m1) = 0; MP_DIGITS(&m1) = 0;
MP_DIGITS(&m2) = 0; MP_DIGITS(&m2) = 0;
MP_DIGITS(&b2) = 0; MP_DIGITS(&b2) = 0;
MP_DIGITS(&h) = 0; MP_DIGITS(&h) = 0;
MP_DIGITS(&c) = 0;
MP_DIGITS(&ctmp) = 0; MP_DIGITS(&ctmp) = 0;
CHECK_MPI_OK( mp_init(&p) ); CHECK_MPI_OK( mp_init(&p) );
CHECK_MPI_OK( mp_init(&q) ); CHECK_MPI_OK( mp_init(&q) );
CHECK_MPI_OK( mp_init(&d_p) ); CHECK_MPI_OK( mp_init(&d_p) );
CHECK_MPI_OK( mp_init(&d_q) ); CHECK_MPI_OK( mp_init(&d_q) );
CHECK_MPI_OK( mp_init(&qInv) ); CHECK_MPI_OK( mp_init(&qInv) );
CHECK_MPI_OK( mp_init(&m) );
CHECK_MPI_OK( mp_init(&m1) ); CHECK_MPI_OK( mp_init(&m1) );
CHECK_MPI_OK( mp_init(&m2) ); CHECK_MPI_OK( mp_init(&m2) );
CHECK_MPI_OK( mp_init(&b2) ); CHECK_MPI_OK( mp_init(&b2) );
CHECK_MPI_OK( mp_init(&h) ); CHECK_MPI_OK( mp_init(&h) );
CHECK_MPI_OK( mp_init(&c) );
CHECK_MPI_OK( mp_init(&ctmp) ); CHECK_MPI_OK( mp_init(&ctmp) );
/* copy private key parameters into mp integers */ /* copy private key parameters into mp integers */
SECITEM_TO_MPINT(key->prime1, &p); /* p */ SECITEM_TO_MPINT(key->prime1, &p); /* p */
@ -357,35 +384,28 @@ rsa_PrivateKeyOpCRT(RSAPrivateKey *key,
SECITEM_TO_MPINT(key->exponent1, &d_p); /* d_p = d mod (p-1) */ SECITEM_TO_MPINT(key->exponent1, &d_p); /* d_p = d mod (p-1) */
SECITEM_TO_MPINT(key->exponent2, &d_q); /* d_p = d mod (q-1) */ SECITEM_TO_MPINT(key->exponent2, &d_q); /* d_p = d mod (q-1) */
SECITEM_TO_MPINT(key->coefficient, &qInv); /* qInv = q**-1 mod p */ SECITEM_TO_MPINT(key->coefficient, &qInv); /* qInv = q**-1 mod p */
/* copy input into mp integer c */
OCTETS_TO_MPINT(input, &c, modLen);
/* 1. m1 = c**d_p mod p */ /* 1. m1 = c**d_p mod p */
CHECK_MPI_OK( mp_mod(&c, &p, &ctmp) ); CHECK_MPI_OK( mp_mod(c, &p, &ctmp) );
CHECK_MPI_OK( mp_exptmod(&ctmp, &d_p, &p, &m1) ); CHECK_MPI_OK( mp_exptmod(&ctmp, &d_p, &p, &m1) );
/* 2. m2 = c**d_q mod q */ /* 2. m2 = c**d_q mod q */
CHECK_MPI_OK( mp_mod(&c, &q, &ctmp) ); CHECK_MPI_OK( mp_mod(c, &q, &ctmp) );
CHECK_MPI_OK( mp_exptmod(&ctmp, &d_q, &q, &m2) ); CHECK_MPI_OK( mp_exptmod(&ctmp, &d_q, &q, &m2) );
/* 3. h = (m1 - m2) * qInv mod p */ /* 3. h = (m1 - m2) * qInv mod p */
CHECK_MPI_OK( mp_submod(&m1, &m2, &p, &h) ); CHECK_MPI_OK( mp_submod(&m1, &m2, &p, &h) );
CHECK_MPI_OK( mp_mulmod(&h, &qInv, &p, &h) ); CHECK_MPI_OK( mp_mulmod(&h, &qInv, &p, &h) );
/* 4. m = m2 + h * q */ /* 4. m = m2 + h * q */
CHECK_MPI_OK( mp_mul(&h, &q, &m) ); CHECK_MPI_OK( mp_mul(&h, &q, m) );
CHECK_MPI_OK( mp_add(&m, &m2, &m) ); CHECK_MPI_OK( mp_add(m, &m2, m) );
/* m is the output */
err = mp_to_fixlen_octets(&m, output, modLen);
if (err >= 0) err = MP_OKAY;
cleanup: cleanup:
mp_clear(&p); mp_clear(&p);
mp_clear(&q); mp_clear(&q);
mp_clear(&d_p); mp_clear(&d_p);
mp_clear(&d_q); mp_clear(&d_q);
mp_clear(&qInv); mp_clear(&qInv);
mp_clear(&m);
mp_clear(&m1); mp_clear(&m1);
mp_clear(&m2); mp_clear(&m2);
mp_clear(&b2); mp_clear(&b2);
mp_clear(&h); mp_clear(&h);
mp_clear(&c);
if (err) { if (err) {
MP_TO_SEC_ERROR(err); MP_TO_SEC_ERROR(err);
rv = SECFailure; rv = SECFailure;
@ -393,6 +413,175 @@ cleanup:
return rv; return rv;
} }
static PRCallOnceType coBPInit = { 0, 0, 0 };
static PRStatus
init_blinding_params_list(void)
{
blindingParamsList.lock = PR_NewLock();
if (!blindingParamsList.lock) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
return PR_FAILURE;
}
PR_INIT_CLIST(&blindingParamsList.head);
return PR_SUCCESS;
}
static SECStatus
generate_blinding_params(struct RSABlindingParamsStr *rsabp,
RSAPrivateKey *key, mp_int *n, unsigned int modLen)
{
SECStatus rv = SECSuccess;
mp_int e, k;
mp_err err = MP_OKAY;
unsigned char *kb = NULL;
MP_DIGITS(&e) = 0;
MP_DIGITS(&k) = 0;
CHECK_MPI_OK( mp_init(&e) );
CHECK_MPI_OK( mp_init(&k) );
SECITEM_TO_MPINT(key->publicExponent, &e);
/* generate random k < n */
kb = PORT_Alloc(modLen);
if (!kb) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
goto cleanup;
}
CHECK_SEC_OK( RNG_GenerateGlobalRandomBytes(kb, modLen) );
CHECK_MPI_OK( mp_read_unsigned_octets(&k, kb, modLen) );
/* k < n */
CHECK_MPI_OK( mp_mod(&k, n, &k) );
/* f = k**e mod n */
CHECK_MPI_OK( mp_exptmod(&k, &e, n, &rsabp->f) );
/* g = k**-1 mod n */
CHECK_MPI_OK( mp_invmod(&k, n, &rsabp->g) );
/* Initialize the counter for this (f, g) */
rsabp->counter = RSA_BLINDING_PARAMS_MAX_REUSE;
cleanup:
if (kb)
PORT_ZFree(kb, modLen);
mp_clear(&k);
mp_clear(&e);
if (err) {
MP_TO_SEC_ERROR(err);
rv = SECFailure;
}
return rv;
}
static SECStatus
init_blinding_params(struct RSABlindingParamsStr *rsabp, RSAPrivateKey *key,
mp_int *n, unsigned int modLen)
{
SECStatus rv = SECSuccess;
mp_err err = MP_OKAY;
MP_DIGITS(&rsabp->f) = 0;
MP_DIGITS(&rsabp->g) = 0;
/* initialize blinding parameters */
CHECK_MPI_OK( mp_init(&rsabp->f) );
CHECK_MPI_OK( mp_init(&rsabp->g) );
/* List elements are keyed using the modulus */
SECITEM_CopyItem(NULL, &rsabp->modulus, &key->modulus);
CHECK_SEC_OK( generate_blinding_params(rsabp, key, n, modLen) );
return SECSuccess;
cleanup:
mp_clear(&rsabp->f);
mp_clear(&rsabp->g);
if (err) {
MP_TO_SEC_ERROR(err);
rv = SECFailure;
}
return rv;
}
static SECStatus
get_blinding_params(RSAPrivateKey *key, mp_int *n, unsigned int modLen,
mp_int *f, mp_int *g)
{
SECStatus rv = SECSuccess;
mp_err err = MP_OKAY;
int cmp;
PRCList *el;
struct RSABlindingParamsStr *rsabp = NULL;
/* Init the list if neccessary (the init function is only called once!) */
if (blindingParamsList.lock == NULL) {
if (PR_CallOnce(&coBPInit, init_blinding_params_list) != PR_SUCCESS) {
PORT_SetError(SEC_ERROR_LIBRARY_FAILURE);
return SECFailure;
}
}
/* Acquire the list lock */
PR_Lock(blindingParamsList.lock);
/* Walk the list looking for the private key */
for (el = PR_NEXT_LINK(&blindingParamsList.head);
el != &blindingParamsList.head;
el = PR_NEXT_LINK(el)) {
rsabp = (struct RSABlindingParamsStr *)el;
cmp = SECITEM_CompareItem(&rsabp->modulus, &key->modulus);
if (cmp == 0) {
/* Check the usage counter for the parameters */
if (--rsabp->counter <= 0) {
/* Regenerate the blinding parameters */
CHECK_SEC_OK( generate_blinding_params(rsabp, key, n, modLen) );
}
/* Return the parameters */
CHECK_MPI_OK( mp_copy(&rsabp->f, f) );
CHECK_MPI_OK( mp_copy(&rsabp->g, g) );
/* Now that the params are located, release the list lock. */
PR_Unlock(blindingParamsList.lock); /* XXX when fails? */
return SECSuccess;
} else if (cmp > 0) {
/* The key is not in the list. Break to param creation. */
break;
}
}
/* At this point, the key is not in the list. el should point to the
** list element that this key should be inserted before. NOTE: the list
** lock is still held, so there cannot be a race condition here.
*/
rsabp = (struct RSABlindingParamsStr *)
PORT_ZAlloc(sizeof(struct RSABlindingParamsStr));
if (!rsabp) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
goto cleanup;
}
/* Initialize the list pointer for the element */
PR_INIT_CLIST(&rsabp->link);
/* Initialize the blinding parameters
** This ties up the list lock while doing some heavy, element-specific
** operations, but we don't want to insert the element until it is valid,
** which requires computing the blinding params. If this proves costly,
** it could be done after the list lock is released, and then if it fails
** the lock would have to be reobtained and the invalid element removed.
*/
rv = init_blinding_params(rsabp, key, n, modLen);
if (rv != SECSuccess) {
PORT_ZFree(rsabp, sizeof(struct RSABlindingParamsStr));
goto cleanup;
}
/* Insert the new element into the list
** If inserting in the middle of the list, el points to the link
** to insert before. Otherwise, the link needs to be appended to
** the end of the list, which is the same as inserting before the
** head (since el would have looped back to the head).
*/
PR_INSERT_BEFORE(&rsabp->link, el);
/* Return the parameters */
CHECK_MPI_OK( mp_copy(&rsabp->f, f) );
CHECK_MPI_OK( mp_copy(&rsabp->g, g) );
/* Release the list lock */
PR_Unlock(blindingParamsList.lock); /* XXX when fails? */
return SECSuccess;
cleanup:
/* It is possible to reach this after the lock is already released.
** Ignore the error in that case.
*/
PR_Unlock(blindingParamsList.lock);
if (err) {
MP_TO_SEC_ERROR(err);
rv = SECFailure;
}
return SECFailure;
}
/* /*
** Perform a raw private-key operation ** Perform a raw private-key operation
** Length of input and output buffers are equal to key's modulus len. ** Length of input and output buffers are equal to key's modulus len.
@ -404,10 +593,24 @@ RSA_PrivateKeyOp(RSAPrivateKey *key,
{ {
unsigned int modLen; unsigned int modLen;
unsigned int offset; unsigned int offset;
SECStatus rv;
mp_err err;
mp_int n, c, m;
mp_int f, g;
if (!key || !output || !input) { if (!key || !output || !input) {
PORT_SetError(SEC_ERROR_INVALID_ARGS); PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure; return SECFailure;
} }
MP_DIGITS(&n) = 0;
MP_DIGITS(&c) = 0;
MP_DIGITS(&m) = 0;
MP_DIGITS(&f) = 0;
MP_DIGITS(&g) = 0;
CHECK_MPI_OK( mp_init(&n) );
CHECK_MPI_OK( mp_init(&c) );
CHECK_MPI_OK( mp_init(&m) );
CHECK_MPI_OK( mp_init(&f) );
CHECK_MPI_OK( mp_init(&g) );
/* check input out of range (needs to be in range [0..n-1]) */ /* check input out of range (needs to be in range [0..n-1]) */
modLen = rsa_modulusLen(&key->modulus); modLen = rsa_modulusLen(&key->modulus);
offset = (key->modulus.data[0] == 0) ? 1 : 0; /* may be leading 0 */ offset = (key->modulus.data[0] == 0) ? 1 : 0; /* may be leading 0 */
@ -415,13 +618,44 @@ RSA_PrivateKeyOp(RSAPrivateKey *key,
PORT_SetError(SEC_ERROR_INVALID_ARGS); PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure; return SECFailure;
} }
SECITEM_TO_MPINT(key->modulus, &n);
OCTETS_TO_MPINT(input, &c, modLen);
/* If blinding, compute pre-image of ciphertext by multiplying by
** blinding factor
*/
if (nssRSAUseBlinding) {
CHECK_SEC_OK( get_blinding_params(key, &n, modLen, &f, &g) );
/* c' = c*f mod n */
CHECK_MPI_OK( mp_mulmod(&c, &f, &n, &c) );
}
/* Do the private key operation m = c**d mod n */
if ( key->prime1.len == 0 || if ( key->prime1.len == 0 ||
key->prime2.len == 0 || key->prime2.len == 0 ||
key->exponent1.len == 0 || key->exponent1.len == 0 ||
key->exponent2.len == 0 || key->exponent2.len == 0 ||
key->coefficient.len == 0) { key->coefficient.len == 0) {
return rsa_PrivateKeyOp(key, output, input); CHECK_SEC_OK( rsa_PrivateKeyOp(key, &m, &c, &n, modLen) );
} else { } else {
return rsa_PrivateKeyOpCRT(key, output, input); CHECK_SEC_OK( rsa_PrivateKeyOpCRT(key, &m, &c, modLen) );
} }
/* If blinding, compute post-image of plaintext by multiplying by
** blinding factor
*/
if (nssRSAUseBlinding) {
/* m = m'*g mod n */
CHECK_MPI_OK( mp_mulmod(&m, &g, &n, &m) );
}
err = mp_to_fixlen_octets(&m, output, modLen);
if (err >= 0) err = MP_OKAY;
cleanup:
mp_clear(&n);
mp_clear(&c);
mp_clear(&m);
mp_clear(&f);
mp_clear(&g);
if (err) {
MP_TO_SEC_ERROR(err);
rv = SECFailure;
}
return rv;
} }