mirror of
https://github.com/openssl/openssl.git
synced 2024-11-30 21:44:16 +08:00
fc27fca84a
Partial fix for #12964 Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/14473)
335 lines
9.0 KiB
C
335 lines
9.0 KiB
C
/*
|
|
* Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
* Copyright (c) 2004, EdelKey Project. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
* this file except in compliance with the License. You can obtain a copy
|
|
* in the file LICENSE in the source distribution or at
|
|
* https://www.openssl.org/source/license.html
|
|
*
|
|
* Originally written by Christophe Renou and Peter Sylvester,
|
|
* for the EdelKey project.
|
|
*/
|
|
|
|
/* All the SRP APIs in this file are deprecated */
|
|
#define OPENSSL_SUPPRESS_DEPRECATED
|
|
|
|
#ifndef OPENSSL_NO_SRP
|
|
# include "internal/cryptlib.h"
|
|
# include <openssl/sha.h>
|
|
# include <openssl/srp.h>
|
|
# include <openssl/evp.h>
|
|
# include "crypto/bn_srp.h"
|
|
|
|
/* calculate = SHA1(PAD(x) || PAD(y)) */
|
|
|
|
static BIGNUM *srp_Calc_xy(const BIGNUM *x, const BIGNUM *y, const BIGNUM *N,
|
|
OSSL_LIB_CTX *libctx, const char *propq)
|
|
{
|
|
unsigned char digest[SHA_DIGEST_LENGTH];
|
|
unsigned char *tmp = NULL;
|
|
int numN = BN_num_bytes(N);
|
|
BIGNUM *res = NULL;
|
|
EVP_MD *sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
|
|
|
|
if (sha1 == NULL)
|
|
return NULL;
|
|
|
|
if (x != N && BN_ucmp(x, N) >= 0)
|
|
goto err;
|
|
if (y != N && BN_ucmp(y, N) >= 0)
|
|
goto err;
|
|
if ((tmp = OPENSSL_malloc(numN * 2)) == NULL)
|
|
goto err;
|
|
if (BN_bn2binpad(x, tmp, numN) < 0
|
|
|| BN_bn2binpad(y, tmp + numN, numN) < 0
|
|
|| !EVP_Digest(tmp, numN * 2, digest, NULL, sha1, NULL))
|
|
goto err;
|
|
res = BN_bin2bn(digest, sizeof(digest), NULL);
|
|
err:
|
|
EVP_MD_free(sha1);
|
|
OPENSSL_free(tmp);
|
|
return res;
|
|
}
|
|
|
|
static BIGNUM *srp_Calc_k(const BIGNUM *N, const BIGNUM *g,
|
|
OSSL_LIB_CTX *libctx,
|
|
const char *propq)
|
|
{
|
|
/* k = SHA1(N | PAD(g)) -- tls-srp RFC 5054 */
|
|
return srp_Calc_xy(N, g, N, libctx, propq);
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_u_ex(const BIGNUM *A, const BIGNUM *B, const BIGNUM *N,
|
|
OSSL_LIB_CTX *libctx, const char *propq)
|
|
{
|
|
/* u = SHA1(PAD(A) || PAD(B) ) -- tls-srp RFC 5054 */
|
|
return srp_Calc_xy(A, B, N, libctx, propq);
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_u(const BIGNUM *A, const BIGNUM *B, const BIGNUM *N)
|
|
{
|
|
/* u = SHA1(PAD(A) || PAD(B) ) -- tls-srp RFC 5054 */
|
|
return srp_Calc_xy(A, B, N, NULL, NULL);
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_server_key(const BIGNUM *A, const BIGNUM *v, const BIGNUM *u,
|
|
const BIGNUM *b, const BIGNUM *N)
|
|
{
|
|
BIGNUM *tmp = NULL, *S = NULL;
|
|
BN_CTX *bn_ctx;
|
|
|
|
if (u == NULL || A == NULL || v == NULL || b == NULL || N == NULL)
|
|
return NULL;
|
|
|
|
if ((bn_ctx = BN_CTX_new()) == NULL || (tmp = BN_new()) == NULL)
|
|
goto err;
|
|
|
|
/* S = (A*v**u) ** b */
|
|
|
|
if (!BN_mod_exp(tmp, v, u, N, bn_ctx))
|
|
goto err;
|
|
if (!BN_mod_mul(tmp, A, tmp, N, bn_ctx))
|
|
goto err;
|
|
|
|
S = BN_new();
|
|
if (S != NULL && !BN_mod_exp(S, tmp, b, N, bn_ctx)) {
|
|
BN_free(S);
|
|
S = NULL;
|
|
}
|
|
err:
|
|
BN_CTX_free(bn_ctx);
|
|
BN_clear_free(tmp);
|
|
return S;
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_B_ex(const BIGNUM *b, const BIGNUM *N, const BIGNUM *g,
|
|
const BIGNUM *v, OSSL_LIB_CTX *libctx, const char *propq)
|
|
{
|
|
BIGNUM *kv = NULL, *gb = NULL;
|
|
BIGNUM *B = NULL, *k = NULL;
|
|
BN_CTX *bn_ctx;
|
|
|
|
if (b == NULL || N == NULL || g == NULL || v == NULL ||
|
|
(bn_ctx = BN_CTX_new_ex(libctx)) == NULL)
|
|
return NULL;
|
|
|
|
if ((kv = BN_new()) == NULL ||
|
|
(gb = BN_new()) == NULL || (B = BN_new()) == NULL)
|
|
goto err;
|
|
|
|
/* B = g**b + k*v */
|
|
|
|
if (!BN_mod_exp(gb, g, b, N, bn_ctx)
|
|
|| (k = srp_Calc_k(N, g, libctx, propq)) == NULL
|
|
|| !BN_mod_mul(kv, v, k, N, bn_ctx)
|
|
|| !BN_mod_add(B, gb, kv, N, bn_ctx)) {
|
|
BN_free(B);
|
|
B = NULL;
|
|
}
|
|
err:
|
|
BN_CTX_free(bn_ctx);
|
|
BN_clear_free(kv);
|
|
BN_clear_free(gb);
|
|
BN_free(k);
|
|
return B;
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_B(const BIGNUM *b, const BIGNUM *N, const BIGNUM *g,
|
|
const BIGNUM *v)
|
|
{
|
|
return SRP_Calc_B_ex(b, N, g, v, NULL, NULL);
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_x_ex(const BIGNUM *s, const char *user, const char *pass,
|
|
OSSL_LIB_CTX *libctx, const char *propq)
|
|
{
|
|
unsigned char dig[SHA_DIGEST_LENGTH];
|
|
EVP_MD_CTX *ctxt;
|
|
unsigned char *cs = NULL;
|
|
BIGNUM *res = NULL;
|
|
EVP_MD *sha1 = NULL;
|
|
|
|
if ((s == NULL) || (user == NULL) || (pass == NULL))
|
|
return NULL;
|
|
|
|
ctxt = EVP_MD_CTX_new();
|
|
if (ctxt == NULL)
|
|
return NULL;
|
|
if ((cs = OPENSSL_malloc(BN_num_bytes(s))) == NULL)
|
|
goto err;
|
|
|
|
sha1 = EVP_MD_fetch(libctx, "SHA1", propq);
|
|
if (sha1 == NULL)
|
|
goto err;
|
|
|
|
if (!EVP_DigestInit_ex(ctxt, sha1, NULL)
|
|
|| !EVP_DigestUpdate(ctxt, user, strlen(user))
|
|
|| !EVP_DigestUpdate(ctxt, ":", 1)
|
|
|| !EVP_DigestUpdate(ctxt, pass, strlen(pass))
|
|
|| !EVP_DigestFinal_ex(ctxt, dig, NULL)
|
|
|| !EVP_DigestInit_ex(ctxt, sha1, NULL))
|
|
goto err;
|
|
if (BN_bn2bin(s, cs) < 0)
|
|
goto err;
|
|
if (!EVP_DigestUpdate(ctxt, cs, BN_num_bytes(s)))
|
|
goto err;
|
|
|
|
if (!EVP_DigestUpdate(ctxt, dig, sizeof(dig))
|
|
|| !EVP_DigestFinal_ex(ctxt, dig, NULL))
|
|
goto err;
|
|
|
|
res = BN_bin2bn(dig, sizeof(dig), NULL);
|
|
|
|
err:
|
|
EVP_MD_free(sha1);
|
|
OPENSSL_free(cs);
|
|
EVP_MD_CTX_free(ctxt);
|
|
return res;
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_x(const BIGNUM *s, const char *user, const char *pass)
|
|
{
|
|
return SRP_Calc_x_ex(s, user, pass, NULL, NULL);
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_A(const BIGNUM *a, const BIGNUM *N, const BIGNUM *g)
|
|
{
|
|
BN_CTX *bn_ctx;
|
|
BIGNUM *A = NULL;
|
|
|
|
if (a == NULL || N == NULL || g == NULL || (bn_ctx = BN_CTX_new()) == NULL)
|
|
return NULL;
|
|
|
|
if ((A = BN_new()) != NULL && !BN_mod_exp(A, g, a, N, bn_ctx)) {
|
|
BN_free(A);
|
|
A = NULL;
|
|
}
|
|
BN_CTX_free(bn_ctx);
|
|
return A;
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_client_key_ex(const BIGNUM *N, const BIGNUM *B, const BIGNUM *g,
|
|
const BIGNUM *x, const BIGNUM *a, const BIGNUM *u,
|
|
OSSL_LIB_CTX *libctx, const char *propq)
|
|
{
|
|
BIGNUM *tmp = NULL, *tmp2 = NULL, *tmp3 = NULL, *k = NULL, *K = NULL;
|
|
BIGNUM *xtmp = NULL;
|
|
BN_CTX *bn_ctx;
|
|
|
|
if (u == NULL || B == NULL || N == NULL || g == NULL || x == NULL
|
|
|| a == NULL || (bn_ctx = BN_CTX_new_ex(libctx)) == NULL)
|
|
return NULL;
|
|
|
|
if ((tmp = BN_new()) == NULL ||
|
|
(tmp2 = BN_new()) == NULL ||
|
|
(tmp3 = BN_new()) == NULL ||
|
|
(xtmp = BN_new()) == NULL)
|
|
goto err;
|
|
|
|
BN_with_flags(xtmp, x, BN_FLG_CONSTTIME);
|
|
BN_set_flags(tmp, BN_FLG_CONSTTIME);
|
|
if (!BN_mod_exp(tmp, g, xtmp, N, bn_ctx))
|
|
goto err;
|
|
if ((k = srp_Calc_k(N, g, libctx, propq)) == NULL)
|
|
goto err;
|
|
if (!BN_mod_mul(tmp2, tmp, k, N, bn_ctx))
|
|
goto err;
|
|
if (!BN_mod_sub(tmp, B, tmp2, N, bn_ctx))
|
|
goto err;
|
|
if (!BN_mul(tmp3, u, xtmp, bn_ctx))
|
|
goto err;
|
|
if (!BN_add(tmp2, a, tmp3))
|
|
goto err;
|
|
K = BN_new();
|
|
if (K != NULL && !BN_mod_exp(K, tmp, tmp2, N, bn_ctx)) {
|
|
BN_free(K);
|
|
K = NULL;
|
|
}
|
|
|
|
err:
|
|
BN_CTX_free(bn_ctx);
|
|
BN_free(xtmp);
|
|
BN_clear_free(tmp);
|
|
BN_clear_free(tmp2);
|
|
BN_clear_free(tmp3);
|
|
BN_free(k);
|
|
return K;
|
|
}
|
|
|
|
BIGNUM *SRP_Calc_client_key(const BIGNUM *N, const BIGNUM *B, const BIGNUM *g,
|
|
const BIGNUM *x, const BIGNUM *a, const BIGNUM *u)
|
|
{
|
|
return SRP_Calc_client_key_ex(N, B, g, x, a, u, NULL, NULL);
|
|
}
|
|
|
|
int SRP_Verify_B_mod_N(const BIGNUM *B, const BIGNUM *N)
|
|
{
|
|
BIGNUM *r;
|
|
BN_CTX *bn_ctx;
|
|
int ret = 0;
|
|
|
|
if (B == NULL || N == NULL || (bn_ctx = BN_CTX_new()) == NULL)
|
|
return 0;
|
|
|
|
if ((r = BN_new()) == NULL)
|
|
goto err;
|
|
/* Checks if B % N == 0 */
|
|
if (!BN_nnmod(r, B, N, bn_ctx))
|
|
goto err;
|
|
ret = !BN_is_zero(r);
|
|
err:
|
|
BN_CTX_free(bn_ctx);
|
|
BN_free(r);
|
|
return ret;
|
|
}
|
|
|
|
int SRP_Verify_A_mod_N(const BIGNUM *A, const BIGNUM *N)
|
|
{
|
|
/* Checks if A % N == 0 */
|
|
return SRP_Verify_B_mod_N(A, N);
|
|
}
|
|
|
|
static SRP_gN knowngN[] = {
|
|
{"8192", &ossl_bn_generator_19, &ossl_bn_group_8192},
|
|
{"6144", &ossl_bn_generator_5, &ossl_bn_group_6144},
|
|
{"4096", &ossl_bn_generator_5, &ossl_bn_group_4096},
|
|
{"3072", &ossl_bn_generator_5, &ossl_bn_group_3072},
|
|
{"2048", &ossl_bn_generator_2, &ossl_bn_group_2048},
|
|
{"1536", &ossl_bn_generator_2, &ossl_bn_group_1536},
|
|
{"1024", &ossl_bn_generator_2, &ossl_bn_group_1024},
|
|
};
|
|
|
|
# define KNOWN_GN_NUMBER sizeof(knowngN) / sizeof(SRP_gN)
|
|
|
|
/*
|
|
* Check if G and N are known parameters. The values have been generated
|
|
* from the IETF RFC 5054
|
|
*/
|
|
char *SRP_check_known_gN_param(const BIGNUM *g, const BIGNUM *N)
|
|
{
|
|
size_t i;
|
|
if ((g == NULL) || (N == NULL))
|
|
return NULL;
|
|
|
|
for (i = 0; i < KNOWN_GN_NUMBER; i++) {
|
|
if (BN_cmp(knowngN[i].g, g) == 0 && BN_cmp(knowngN[i].N, N) == 0)
|
|
return knowngN[i].id;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
SRP_gN *SRP_get_default_gN(const char *id)
|
|
{
|
|
size_t i;
|
|
|
|
if (id == NULL)
|
|
return knowngN;
|
|
for (i = 0; i < KNOWN_GN_NUMBER; i++) {
|
|
if (strcmp(knowngN[i].id, id) == 0)
|
|
return knowngN + i;
|
|
}
|
|
return NULL;
|
|
}
|
|
#endif
|