diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/srp/srp_lib.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/srp/srp_lib.c | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/srp/srp_lib.c b/openssl-1.1.0h/crypto/srp/srp_lib.c new file mode 100644 index 0000000..e79352c --- /dev/null +++ b/openssl-1.1.0h/crypto/srp/srp_lib.c @@ -0,0 +1,280 @@ +/* + * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (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 + */ + +#ifndef OPENSSL_NO_SRP +# include "internal/cryptlib.h" +# include <openssl/sha.h> +# include <openssl/srp.h> +# include <openssl/evp.h> +# include "internal/bn_srp.h" + +/* calculate = SHA1(PAD(x) || PAD(y)) */ + +static BIGNUM *srp_Calc_xy(const BIGNUM *x, const BIGNUM *y, const BIGNUM *N) +{ + unsigned char digest[SHA_DIGEST_LENGTH]; + unsigned char *tmp = NULL; + int numN = BN_num_bytes(N); + BIGNUM *res = NULL; + if (x != N && BN_ucmp(x, N) >= 0) + return NULL; + if (y != N && BN_ucmp(y, N) >= 0) + return NULL; + 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, EVP_sha1(), NULL)) + goto err; + res = BN_bin2bn(digest, sizeof(digest), NULL); + err: + OPENSSL_free(tmp); + return res; +} + +static BIGNUM *srp_Calc_k(const BIGNUM *N, const BIGNUM *g) +{ + /* k = SHA1(N | PAD(g)) -- tls-srp draft 8 */ + return srp_Calc_xy(N, g, N); +} + +BIGNUM *SRP_Calc_u(const BIGNUM *A, const BIGNUM *B, const BIGNUM *N) +{ + /* k = SHA1(PAD(A) || PAD(B) ) -- tls-srp draft 8 */ + return srp_Calc_xy(A, B, N); +} + +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(const BIGNUM *b, const BIGNUM *N, const BIGNUM *g, + const BIGNUM *v) +{ + 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()) == 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)) == 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_x(const BIGNUM *s, const char *user, const char *pass) +{ + unsigned char dig[SHA_DIGEST_LENGTH]; + EVP_MD_CTX *ctxt; + unsigned char *cs = NULL; + BIGNUM *res = 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; + + if (!EVP_DigestInit_ex(ctxt, EVP_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, EVP_sha1(), NULL)) + goto err; + BN_bn2bin(s, cs); + 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: + OPENSSL_free(cs); + EVP_MD_CTX_free(ctxt); + return res; +} + +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(const BIGNUM *N, const BIGNUM *B, const BIGNUM *g, + const BIGNUM *x, const BIGNUM *a, const BIGNUM *u) +{ + BIGNUM *tmp = NULL, *tmp2 = NULL, *tmp3 = NULL, *k = NULL, *K = NULL; + BN_CTX *bn_ctx; + + if (u == NULL || B == NULL || N == NULL || g == NULL || x == NULL + || a == NULL || (bn_ctx = BN_CTX_new()) == NULL) + return NULL; + + if ((tmp = BN_new()) == NULL || + (tmp2 = BN_new()) == NULL || + (tmp3 = BN_new()) == NULL) + goto err; + + if (!BN_mod_exp(tmp, g, x, N, bn_ctx)) + goto err; + if ((k = srp_Calc_k(N, g)) == 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, x, 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_clear_free(tmp); + BN_clear_free(tmp2); + BN_clear_free(tmp3); + BN_free(k); + return K; +} + +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", &bn_generator_19, &bn_group_8192}, + {"6144", &bn_generator_5, &bn_group_6144}, + {"4096", &bn_generator_5, &bn_group_4096}, + {"3072", &bn_generator_5, &bn_group_3072}, + {"2048", &bn_generator_2, &bn_group_2048}, + {"1536", &bn_generator_2, &bn_group_1536}, + {"1024", &bn_generator_2, &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-tls-srp draft version 8 + */ +char *SRP_check_known_gN_param(const BIGNUM *g, const BIGNUM *N) +{ + size_t i; + if ((g == NULL) || (N == NULL)) + return 0; + + 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 |