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Unified Diff: nss/lib/freebl/dsa.c

Issue 2078763002: Delete bundled copy of NSS and replace with README. (Closed) Base URL: https://chromium.googlesource.com/chromium/deps/nss@master
Patch Set: Delete bundled copy of NSS and replace with README. Created 4 years, 6 months ago
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Index: nss/lib/freebl/dsa.c
diff --git a/nss/lib/freebl/dsa.c b/nss/lib/freebl/dsa.c
deleted file mode 100644
index 0da63ed549324934e5d40776c925cbb9e7b69e30..0000000000000000000000000000000000000000
--- a/nss/lib/freebl/dsa.c
+++ /dev/null
@@ -1,631 +0,0 @@
-/*
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifdef FREEBL_NO_DEPEND
-#include "stubs.h"
-#endif
-
-#include "prerror.h"
-#include "secerr.h"
-
-#include "prtypes.h"
-#include "prinit.h"
-#include "blapi.h"
-#include "nssilock.h"
-#include "secitem.h"
-#include "blapi.h"
-#include "mpi.h"
-#include "secmpi.h"
-#include "pqg.h"
-
- /* XXX to be replaced by define in blapit.h */
-#define NSS_FREEBL_DSA_DEFAULT_CHUNKSIZE 2048
-
-/*
- * FIPS 186-2 requires result from random output to be reduced mod q when
- * generating random numbers for DSA.
- *
- * Input: w, 2*qLen bytes
- * q, qLen bytes
- * Output: xj, qLen bytes
- */
-static SECStatus
-fips186Change_ReduceModQForDSA(const PRUint8 *w, const PRUint8 *q,
- unsigned int qLen, PRUint8 * xj)
-{
- mp_int W, Q, Xj;
- mp_err err;
- SECStatus rv = SECSuccess;
-
- /* Initialize MPI integers. */
- MP_DIGITS(&W) = 0;
- MP_DIGITS(&Q) = 0;
- MP_DIGITS(&Xj) = 0;
- CHECK_MPI_OK( mp_init(&W) );
- CHECK_MPI_OK( mp_init(&Q) );
- CHECK_MPI_OK( mp_init(&Xj) );
- /*
- * Convert input arguments into MPI integers.
- */
- CHECK_MPI_OK( mp_read_unsigned_octets(&W, w, 2*qLen) );
- CHECK_MPI_OK( mp_read_unsigned_octets(&Q, q, qLen) );
-
- /*
- * Algorithm 1 of FIPS 186-2 Change Notice 1, Step 3.3
- *
- * xj = (w0 || w1) mod q
- */
- CHECK_MPI_OK( mp_mod(&W, &Q, &Xj) );
- CHECK_MPI_OK( mp_to_fixlen_octets(&Xj, xj, qLen) );
-cleanup:
- mp_clear(&W);
- mp_clear(&Q);
- mp_clear(&Xj);
- if (err) {
- MP_TO_SEC_ERROR(err);
- rv = SECFailure;
- }
- return rv;
-}
-
-/*
- * FIPS 186-2 requires result from random output to be reduced mod q when
- * generating random numbers for DSA.
- */
-SECStatus
-FIPS186Change_ReduceModQForDSA(const unsigned char *w,
- const unsigned char *q,
- unsigned char *xj) {
- return fips186Change_ReduceModQForDSA(w, q, DSA1_SUBPRIME_LEN, xj);
-}
-
-/*
- * The core of Algorithm 1 of FIPS 186-2 Change Notice 1.
- *
- * We no longer support FIPS 186-2 RNG. This function was exported
- * for power-up self tests and FIPS tests. Keep this stub, which fails,
- * to prevent crashes, but also to signal to test code that FIPS 186-2
- * RNG is no longer supported.
- */
-SECStatus
-FIPS186Change_GenerateX(PRUint8 *XKEY, const PRUint8 *XSEEDj,
- PRUint8 *x_j)
-{
- PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
- return SECFailure;
-}
-
-/*
- * Specialized RNG for DSA
- *
- * As per Algorithm 1 of FIPS 186-2 Change Notice 1, in step 3.3 the value
- * Xj should be reduced mod q, a 160-bit prime number. Since this parameter
- * is only meaningful in the context of DSA, the above RNG functions
- * were implemented without it. They are re-implemented below for use
- * with DSA.
- */
-
-/*
-** Generate some random bytes, using the global random number generator
-** object. In DSA mode, so there is a q.
-*/
-static SECStatus
-dsa_GenerateGlobalRandomBytes(const SECItem * qItem, PRUint8 * dest,
- unsigned int * destLen, unsigned int maxDestLen)
-{
- SECStatus rv;
- SECItem w;
- const PRUint8 * q = qItem->data;
- unsigned int qLen = qItem->len;
-
- if (*q == 0) {
- ++q;
- --qLen;
- }
- if (maxDestLen < qLen) {
- /* This condition can occur when DSA_SignDigest is passed a group
- with a subprime that is larger than DSA_MAX_SUBPRIME_LEN. */
- PORT_SetError(SEC_ERROR_INVALID_ARGS);
- return SECFailure;
- }
- w.data = NULL; /* otherwise SECITEM_AllocItem asserts */
- if (!SECITEM_AllocItem(NULL, &w, 2*qLen)) {
- return SECFailure;
- }
- *destLen = qLen;
-
- rv = RNG_GenerateGlobalRandomBytes(w.data, w.len);
- if (rv == SECSuccess) {
- rv = fips186Change_ReduceModQForDSA(w.data, q, qLen, dest);
- }
-
- SECITEM_FreeItem(&w, PR_FALSE);
- return rv;
-}
-
-static void translate_mpi_error(mp_err err)
-{
- MP_TO_SEC_ERROR(err);
-}
-
-static SECStatus
-dsa_NewKeyExtended(const PQGParams *params, const SECItem * seed,
- DSAPrivateKey **privKey)
-{
- mp_int p, g;
- mp_int x, y;
- mp_err err;
- PLArenaPool *arena;
- DSAPrivateKey *key;
- /* Check args. */
- if (!params || !privKey || !seed || !seed->data) {
- PORT_SetError(SEC_ERROR_INVALID_ARGS);
- return SECFailure;
- }
- /* Initialize an arena for the DSA key. */
- arena = PORT_NewArena(NSS_FREEBL_DSA_DEFAULT_CHUNKSIZE);
- if (!arena) {
- PORT_SetError(SEC_ERROR_NO_MEMORY);
- return SECFailure;
- }
- key = (DSAPrivateKey *)PORT_ArenaZAlloc(arena, sizeof(DSAPrivateKey));
- if (!key) {
- PORT_SetError(SEC_ERROR_NO_MEMORY);
- PORT_FreeArena(arena, PR_TRUE);
- return SECFailure;
- }
- key->params.arena = arena;
- /* Initialize MPI integers. */
- MP_DIGITS(&p) = 0;
- MP_DIGITS(&g) = 0;
- MP_DIGITS(&x) = 0;
- MP_DIGITS(&y) = 0;
- CHECK_MPI_OK( mp_init(&p) );
- CHECK_MPI_OK( mp_init(&g) );
- CHECK_MPI_OK( mp_init(&x) );
- CHECK_MPI_OK( mp_init(&y) );
- /* Copy over the PQG params */
- CHECK_MPI_OK( SECITEM_CopyItem(arena, &key->params.prime,
- &params->prime) );
- CHECK_MPI_OK( SECITEM_CopyItem(arena, &key->params.subPrime,
- &params->subPrime) );
- CHECK_MPI_OK( SECITEM_CopyItem(arena, &key->params.base, &params->base) );
- /* Convert stored p, g, and received x into MPI integers. */
- SECITEM_TO_MPINT(params->prime, &p);
- SECITEM_TO_MPINT(params->base, &g);
- OCTETS_TO_MPINT(seed->data, &x, seed->len);
- /* Store x in private key */
- SECITEM_AllocItem(arena, &key->privateValue, seed->len);
- PORT_Memcpy(key->privateValue.data, seed->data, seed->len);
- /* Compute public key y = g**x mod p */
- CHECK_MPI_OK( mp_exptmod(&g, &x, &p, &y) );
- /* Store y in public key */
- MPINT_TO_SECITEM(&y, &key->publicValue, arena);
- *privKey = key;
- key = NULL;
-cleanup:
- mp_clear(&p);
- mp_clear(&g);
- mp_clear(&x);
- mp_clear(&y);
- if (key)
- PORT_FreeArena(key->params.arena, PR_TRUE);
- if (err) {
- translate_mpi_error(err);
- return SECFailure;
- }
- return SECSuccess;
-}
-
-SECStatus
-DSA_NewRandom(PLArenaPool * arena, const SECItem * q, SECItem * seed)
-{
- int retries = 10;
- unsigned int i;
- PRBool good;
-
- if (q == NULL || q->data == NULL || q->len == 0 ||
- (q->data[0] == 0 && q->len == 1)) {
- PORT_SetError(SEC_ERROR_INVALID_ARGS);
- return SECFailure;
- }
-
- if (!SECITEM_AllocItem(arena, seed, q->len)) {
- return SECFailure;
- }
-
- do {
- /* Generate seed bytes for x according to FIPS 186-1 appendix 3 */
- if (dsa_GenerateGlobalRandomBytes(q, seed->data, &seed->len,
- seed->len)) {
- goto loser;
- }
- /* Disallow values of 0 and 1 for x. */
- good = PR_FALSE;
- for (i = 0; i < seed->len-1; i++) {
- if (seed->data[i] != 0) {
- good = PR_TRUE;
- break;
- }
- }
- if (!good && seed->data[i] > 1) {
- good = PR_TRUE;
- }
- } while (!good && --retries > 0);
-
- if (!good) {
- PORT_SetError(SEC_ERROR_NEED_RANDOM);
-loser: if (arena != NULL) {
- SECITEM_FreeItem(seed, PR_FALSE);
- }
- return SECFailure;
- }
-
- return SECSuccess;
-}
-
-/*
-** Generate and return a new DSA public and private key pair,
-** both of which are encoded into a single DSAPrivateKey struct.
-** "params" is a pointer to the PQG parameters for the domain
-** Uses a random seed.
-*/
-SECStatus
-DSA_NewKey(const PQGParams *params, DSAPrivateKey **privKey)
-{
- SECItem seed;
- SECStatus rv;
-
- rv = PQG_Check(params);
- if (rv != SECSuccess) {
- return rv;
- }
- seed.data = NULL;
-
- rv = DSA_NewRandom(NULL, &params->subPrime, &seed);
- if (rv == SECSuccess) {
- if (seed.len != PQG_GetLength(&params->subPrime)) {
- PORT_SetError(SEC_ERROR_INVALID_ARGS);
- rv = SECFailure;
- } else {
- rv = dsa_NewKeyExtended(params, &seed, privKey);
- }
- }
- SECITEM_FreeItem(&seed, PR_FALSE);
- return rv;
-}
-
-/* For FIPS compliance testing. Seed must be exactly the size of subPrime */
-SECStatus
-DSA_NewKeyFromSeed(const PQGParams *params,
- const unsigned char *seed,
- DSAPrivateKey **privKey)
-{
- SECItem seedItem;
- seedItem.data = (unsigned char*) seed;
- seedItem.len = PQG_GetLength(&params->subPrime);
- return dsa_NewKeyExtended(params, &seedItem, privKey);
-}
-
-static SECStatus
-dsa_SignDigest(DSAPrivateKey *key, SECItem *signature, const SECItem *digest,
- const unsigned char *kb)
-{
- mp_int p, q, g; /* PQG parameters */
- mp_int x, k; /* private key & pseudo-random integer */
- mp_int r, s; /* tuple (r, s) is signature) */
- mp_err err = MP_OKAY;
- SECStatus rv = SECSuccess;
- unsigned int dsa_subprime_len, dsa_signature_len, offset;
- SECItem localDigest;
- unsigned char localDigestData[DSA_MAX_SUBPRIME_LEN];
-
-
- /* FIPS-compliance dictates that digest is a SHA hash. */
- /* Check args. */
- if (!key || !signature || !digest) {
- PORT_SetError(SEC_ERROR_INVALID_ARGS);
- return SECFailure;
- }
-
- dsa_subprime_len = PQG_GetLength(&key->params.subPrime);
- dsa_signature_len = dsa_subprime_len*2;
- if ((signature->len < dsa_signature_len) ||
- (digest->len > HASH_LENGTH_MAX) ||
- (digest->len < SHA1_LENGTH)) {
- PORT_SetError(SEC_ERROR_INVALID_ARGS);
- return SECFailure;
- }
-
- /* DSA accepts digests not equal to dsa_subprime_len, if the
- * digests are greater, then they are truncated to the size of
- * dsa_subprime_len, using the left most bits. If they are less
- * then they are padded on the left.*/
- PORT_Memset(localDigestData, 0, dsa_subprime_len);
- offset = (digest->len < dsa_subprime_len) ?
- (dsa_subprime_len - digest->len) : 0;
- PORT_Memcpy(localDigestData+offset, digest->data,
- dsa_subprime_len - offset);
- localDigest.data = localDigestData;
- localDigest.len = dsa_subprime_len;
-
- /* Initialize MPI integers. */
- MP_DIGITS(&p) = 0;
- MP_DIGITS(&q) = 0;
- MP_DIGITS(&g) = 0;
- MP_DIGITS(&x) = 0;
- MP_DIGITS(&k) = 0;
- MP_DIGITS(&r) = 0;
- MP_DIGITS(&s) = 0;
- CHECK_MPI_OK( mp_init(&p) );
- CHECK_MPI_OK( mp_init(&q) );
- CHECK_MPI_OK( mp_init(&g) );
- CHECK_MPI_OK( mp_init(&x) );
- CHECK_MPI_OK( mp_init(&k) );
- CHECK_MPI_OK( mp_init(&r) );
- CHECK_MPI_OK( mp_init(&s) );
- /*
- ** Convert stored PQG and private key into MPI integers.
- */
- SECITEM_TO_MPINT(key->params.prime, &p);
- SECITEM_TO_MPINT(key->params.subPrime, &q);
- SECITEM_TO_MPINT(key->params.base, &g);
- SECITEM_TO_MPINT(key->privateValue, &x);
- OCTETS_TO_MPINT(kb, &k, dsa_subprime_len);
- /*
- ** FIPS 186-1, Section 5, Step 1
- **
- ** r = (g**k mod p) mod q
- */
- CHECK_MPI_OK( mp_exptmod(&g, &k, &p, &r) ); /* r = g**k mod p */
- CHECK_MPI_OK( mp_mod(&r, &q, &r) ); /* r = r mod q */
- /*
- ** FIPS 186-1, Section 5, Step 2
- **
- ** s = (k**-1 * (HASH(M) + x*r)) mod q
- */
- SECITEM_TO_MPINT(localDigest, &s); /* s = HASH(M) */
- CHECK_MPI_OK( mp_invmod(&k, &q, &k) ); /* k = k**-1 mod q */
- CHECK_MPI_OK( mp_mulmod(&x, &r, &q, &x) ); /* x = x * r mod q */
- CHECK_MPI_OK( mp_addmod(&s, &x, &q, &s) ); /* s = s + x mod q */
- CHECK_MPI_OK( mp_mulmod(&s, &k, &q, &s) ); /* s = s * k mod q */
- /*
- ** verify r != 0 and s != 0
- ** mentioned as optional in FIPS 186-1.
- */
- if (mp_cmp_z(&r) == 0 || mp_cmp_z(&s) == 0) {
- PORT_SetError(SEC_ERROR_NEED_RANDOM);
- rv = SECFailure;
- goto cleanup;
- }
- /*
- ** Step 4
- **
- ** Signature is tuple (r, s)
- */
- err = mp_to_fixlen_octets(&r, signature->data, dsa_subprime_len);
- if (err < 0) goto cleanup;
- err = mp_to_fixlen_octets(&s, signature->data + dsa_subprime_len,
- dsa_subprime_len);
- if (err < 0) goto cleanup;
- err = MP_OKAY;
- signature->len = dsa_signature_len;
-cleanup:
- PORT_Memset(localDigestData, 0, DSA_MAX_SUBPRIME_LEN);
- mp_clear(&p);
- mp_clear(&q);
- mp_clear(&g);
- mp_clear(&x);
- mp_clear(&k);
- mp_clear(&r);
- mp_clear(&s);
- if (err) {
- translate_mpi_error(err);
- rv = SECFailure;
- }
- return rv;
-}
-
-/* signature is caller-supplied buffer of at least 40 bytes.
-** On input, signature->len == size of buffer to hold signature.
-** digest->len == size of digest.
-** On output, signature->len == size of signature in buffer.
-** Uses a random seed.
-*/
-SECStatus
-DSA_SignDigest(DSAPrivateKey *key, SECItem *signature, const SECItem *digest)
-{
- SECStatus rv;
- int retries = 10;
- unsigned char kSeed[DSA_MAX_SUBPRIME_LEN];
- unsigned int kSeedLen = 0;
- unsigned int i;
- unsigned int dsa_subprime_len = PQG_GetLength(&key->params.subPrime);
- PRBool good;
-
- PORT_SetError(0);
- do {
- rv = dsa_GenerateGlobalRandomBytes(&key->params.subPrime,
- kSeed, &kSeedLen, sizeof kSeed);
- if (rv != SECSuccess)
- break;
- if (kSeedLen != dsa_subprime_len) {
- PORT_SetError(SEC_ERROR_INVALID_ARGS);
- rv = SECFailure;
- break;
- }
- /* Disallow a value of 0 for k. */
- good = PR_FALSE;
- for (i = 0; i < kSeedLen; i++) {
- if (kSeed[i] != 0) {
- good = PR_TRUE;
- break;
- }
- }
- if (!good) {
- PORT_SetError(SEC_ERROR_NEED_RANDOM);
- rv = SECFailure;
- continue;
- }
- rv = dsa_SignDigest(key, signature, digest, kSeed);
- } while (rv != SECSuccess && PORT_GetError() == SEC_ERROR_NEED_RANDOM &&
- --retries > 0);
- return rv;
-}
-
-/* For FIPS compliance testing. Seed must be exactly 20 bytes. */
-SECStatus
-DSA_SignDigestWithSeed(DSAPrivateKey * key,
- SECItem * signature,
- const SECItem * digest,
- const unsigned char * seed)
-{
- SECStatus rv;
- rv = dsa_SignDigest(key, signature, digest, seed);
- return rv;
-}
-
-/* signature is caller-supplied buffer of at least 20 bytes.
-** On input, signature->len == size of buffer to hold signature.
-** digest->len == size of digest.
-*/
-SECStatus
-DSA_VerifyDigest(DSAPublicKey *key, const SECItem *signature,
- const SECItem *digest)
-{
- /* FIPS-compliance dictates that digest is a SHA hash. */
- mp_int p, q, g; /* PQG parameters */
- mp_int r_, s_; /* tuple (r', s') is received signature) */
- mp_int u1, u2, v, w; /* intermediate values used in verification */
- mp_int y; /* public key */
- mp_err err;
- unsigned int dsa_subprime_len, dsa_signature_len, offset;
- SECItem localDigest;
- unsigned char localDigestData[DSA_MAX_SUBPRIME_LEN];
- SECStatus verified = SECFailure;
-
- /* Check args. */
- if (!key || !signature || !digest ) {
- PORT_SetError(SEC_ERROR_INVALID_ARGS);
- return SECFailure;
- }
-
- dsa_subprime_len = PQG_GetLength(&key->params.subPrime);
- dsa_signature_len = dsa_subprime_len*2;
- if ((signature->len != dsa_signature_len) ||
- (digest->len > HASH_LENGTH_MAX) ||
- (digest->len < SHA1_LENGTH)) {
- PORT_SetError(SEC_ERROR_INVALID_ARGS);
- return SECFailure;
- }
-
- /* DSA accepts digests not equal to dsa_subprime_len, if the
- * digests are greater, than they are truncated to the size of
- * dsa_subprime_len, using the left most bits. If they are less
- * then they are padded on the left.*/
- PORT_Memset(localDigestData, 0, dsa_subprime_len);
- offset = (digest->len < dsa_subprime_len) ?
- (dsa_subprime_len - digest->len) : 0;
- PORT_Memcpy(localDigestData+offset, digest->data,
- dsa_subprime_len - offset);
- localDigest.data = localDigestData;
- localDigest.len = dsa_subprime_len;
-
- /* Initialize MPI integers. */
- MP_DIGITS(&p) = 0;
- MP_DIGITS(&q) = 0;
- MP_DIGITS(&g) = 0;
- MP_DIGITS(&y) = 0;
- MP_DIGITS(&r_) = 0;
- MP_DIGITS(&s_) = 0;
- MP_DIGITS(&u1) = 0;
- MP_DIGITS(&u2) = 0;
- MP_DIGITS(&v) = 0;
- MP_DIGITS(&w) = 0;
- CHECK_MPI_OK( mp_init(&p) );
- CHECK_MPI_OK( mp_init(&q) );
- CHECK_MPI_OK( mp_init(&g) );
- CHECK_MPI_OK( mp_init(&y) );
- CHECK_MPI_OK( mp_init(&r_) );
- CHECK_MPI_OK( mp_init(&s_) );
- CHECK_MPI_OK( mp_init(&u1) );
- CHECK_MPI_OK( mp_init(&u2) );
- CHECK_MPI_OK( mp_init(&v) );
- CHECK_MPI_OK( mp_init(&w) );
- /*
- ** Convert stored PQG and public key into MPI integers.
- */
- SECITEM_TO_MPINT(key->params.prime, &p);
- SECITEM_TO_MPINT(key->params.subPrime, &q);
- SECITEM_TO_MPINT(key->params.base, &g);
- SECITEM_TO_MPINT(key->publicValue, &y);
- /*
- ** Convert received signature (r', s') into MPI integers.
- */
- OCTETS_TO_MPINT(signature->data, &r_, dsa_subprime_len);
- OCTETS_TO_MPINT(signature->data + dsa_subprime_len, &s_, dsa_subprime_len);
- /*
- ** Verify that 0 < r' < q and 0 < s' < q
- */
- if (mp_cmp_z(&r_) <= 0 || mp_cmp_z(&s_) <= 0 ||
- mp_cmp(&r_, &q) >= 0 || mp_cmp(&s_, &q) >= 0) {
- /* err is zero here. */
- PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
- goto cleanup; /* will return verified == SECFailure */
- }
- /*
- ** FIPS 186-1, Section 6, Step 1
- **
- ** w = (s')**-1 mod q
- */
- CHECK_MPI_OK( mp_invmod(&s_, &q, &w) ); /* w = (s')**-1 mod q */
- /*
- ** FIPS 186-1, Section 6, Step 2
- **
- ** u1 = ((Hash(M')) * w) mod q
- */
- SECITEM_TO_MPINT(localDigest, &u1); /* u1 = HASH(M') */
- CHECK_MPI_OK( mp_mulmod(&u1, &w, &q, &u1) ); /* u1 = u1 * w mod q */
- /*
- ** FIPS 186-1, Section 6, Step 3
- **
- ** u2 = ((r') * w) mod q
- */
- CHECK_MPI_OK( mp_mulmod(&r_, &w, &q, &u2) );
- /*
- ** FIPS 186-1, Section 6, Step 4
- **
- ** v = ((g**u1 * y**u2) mod p) mod q
- */
- CHECK_MPI_OK( mp_exptmod(&g, &u1, &p, &g) ); /* g = g**u1 mod p */
- CHECK_MPI_OK( mp_exptmod(&y, &u2, &p, &y) ); /* y = y**u2 mod p */
- CHECK_MPI_OK( mp_mulmod(&g, &y, &p, &v) ); /* v = g * y mod p */
- CHECK_MPI_OK( mp_mod(&v, &q, &v) ); /* v = v mod q */
- /*
- ** Verification: v == r'
- */
- if (mp_cmp(&v, &r_)) {
- PORT_SetError(SEC_ERROR_BAD_SIGNATURE);
- verified = SECFailure; /* Signature failed to verify. */
- } else {
- verified = SECSuccess; /* Signature verified. */
- }
-cleanup:
- mp_clear(&p);
- mp_clear(&q);
- mp_clear(&g);
- mp_clear(&y);
- mp_clear(&r_);
- mp_clear(&s_);
- mp_clear(&u1);
- mp_clear(&u2);
- mp_clear(&v);
- mp_clear(&w);
- if (err) {
- translate_mpi_error(err);
- }
- return verified;
-}
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