diff options
author | Dr. Stephen Henson <steve@openssl.org> | 2013-07-17 15:01:08 +0100 |
---|---|---|
committer | Dr. Stephen Henson <steve@openssl.org> | 2013-07-17 21:45:00 +0100 |
commit | 25af7a5dbc05c7359d1d7f472d50d65a9d876b7e (patch) | |
tree | 2cc91a776a11118aa68be08f77ddb55157d186b3 /crypto | |
parent | 6af440ced43d766e418c2eb0cda1525eecd3e62b (diff) |
Add support for X9.62 KDF.
Add X9.62 KDF to EC EVP_PKEY_METHOD.
Diffstat (limited to 'crypto')
-rw-r--r-- | crypto/ec/ec.h | 66 | ||||
-rw-r--r-- | crypto/ec/ec_pmeth.c | 179 | ||||
-rw-r--r-- | crypto/ecdh/Makefile | 4 | ||||
-rw-r--r-- | crypto/ecdh/ecdh.h | 5 | ||||
-rw-r--r-- | crypto/ecdh/ech_kdf.c | 116 |
5 files changed, 364 insertions, 6 deletions
diff --git a/crypto/ec/ec.h b/crypto/ec/ec.h index 0dcad23294..cca45596b2 100644 --- a/crypto/ec/ec.h +++ b/crypto/ec/ec.h @@ -973,8 +973,69 @@ int EC_KEY_print_fp(FILE *fp, const EC_KEY *key, int off); EVP_PKEY_OP_PARAMGEN|EVP_PKEY_OP_KEYGEN, \ EVP_PKEY_CTRL_EC_PARAM_ENC, flag, NULL) +#define EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, flag) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_EC_ECDH_COFACTOR, flag, NULL) + +#define EVP_PKEY_CTX_get_ecdh_cofactor_mode(ctx) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_EC_ECDH_COFACTOR, -2, NULL) + +#define EVP_PKEY_CTX_set_ecdh_kdf_type(ctx, kdf) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_EC_KDF_TYPE, kdf, NULL) + +#define EVP_PKEY_CTX_get_ecdh_kdf_type(ctx) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_EC_KDF_TYPE, -2, NULL) + +#define EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_EC_KDF_MD, 0, (void *)md) + +#define EVP_PKEY_CTX_get_ecdh_kdf_md(ctx, pmd) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_GET_EC_KDF_MD, 0, (void *)pmd) + +#define EVP_PKEY_CTX_set_ecdh_kdf_outlen(ctx, len) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_EC_KDF_OUTLEN, len, NULL) + +#define EVP_PKEY_CTX_get_ecdh_kdf_outlen(ctx, plen) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN, 0, (void *)plen) + +#define EVP_PKEY_CTX_set0_ecdh_kdf_ukm(ctx, p, plen) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_EC_KDF_UKM, plen, (void *)p) + +#define EVP_PKEY_CTX_get0_ecdh_kdf_ukm(ctx, p) \ + EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_EC, \ + EVP_PKEY_OP_DERIVE, \ + EVP_PKEY_CTRL_GET_EC_KDF_UKM, 0, (void *)p) + #define EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID (EVP_PKEY_ALG_CTRL + 1) #define EVP_PKEY_CTRL_EC_PARAM_ENC (EVP_PKEY_ALG_CTRL + 2) +#define EVP_PKEY_CTRL_EC_ECDH_COFACTOR (EVP_PKEY_ALG_CTRL + 3) +#define EVP_PKEY_CTRL_EC_KDF_TYPE (EVP_PKEY_ALG_CTRL + 4) +#define EVP_PKEY_CTRL_EC_KDF_MD (EVP_PKEY_ALG_CTRL + 5) +#define EVP_PKEY_CTRL_GET_EC_KDF_MD (EVP_PKEY_ALG_CTRL + 6) +#define EVP_PKEY_CTRL_EC_KDF_OUTLEN (EVP_PKEY_ALG_CTRL + 7) +#define EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN (EVP_PKEY_ALG_CTRL + 8) +#define EVP_PKEY_CTRL_EC_KDF_UKM (EVP_PKEY_ALG_CTRL + 9) +#define EVP_PKEY_CTRL_GET_EC_KDF_UKM (EVP_PKEY_ALG_CTRL + 10) +/* KDF types */ +#define EVP_PKEY_ECDH_KDF_NONE 1 +#define EVP_PKEY_ECDH_KDF_X9_62 2 /* BEGIN ERROR CODES */ /* The following lines are auto generated by the script mkerr.pl. Any changes @@ -991,6 +1052,8 @@ void ERR_load_EC_strings(void); #define EC_F_D2I_ECPKPARAMETERS 145 #define EC_F_D2I_ECPRIVATEKEY 146 #define EC_F_DO_EC_KEY_PRINT 221 +#define EC_F_ECDH_CMS_DECRYPT 238 +#define EC_F_ECDH_CMS_SET_SHARED_INFO 239 #define EC_F_ECKEY_PARAM2TYPE 223 #define EC_F_ECKEY_PARAM_DECODE 212 #define EC_F_ECKEY_PRIV_DECODE 213 @@ -1149,6 +1212,7 @@ void ERR_load_EC_strings(void); #define EC_R_INVALID_PENTANOMIAL_BASIS 132 #define EC_R_INVALID_PRIVATE_KEY 123 #define EC_R_INVALID_TRINOMIAL_BASIS 137 +#define EC_R_KDF_PARAMETER_ERROR 148 #define EC_R_KEYS_NOT_SET 140 #define EC_R_MISSING_PARAMETERS 124 #define EC_R_MISSING_PRIVATE_KEY 125 @@ -1159,9 +1223,11 @@ void ERR_load_EC_strings(void); #define EC_R_NO_FIELD_MOD 133 #define EC_R_NO_PARAMETERS_SET 139 #define EC_R_PASSED_NULL_PARAMETER 134 +#define EC_R_PEER_KEY_ERROR 149 #define EC_R_PKPARAMETERS2GROUP_FAILURE 127 #define EC_R_POINT_AT_INFINITY 106 #define EC_R_POINT_IS_NOT_ON_CURVE 107 +#define EC_R_SHARED_INFO_ERROR 150 #define EC_R_SLOT_FULL 108 #define EC_R_UNDEFINED_GENERATOR 113 #define EC_R_UNDEFINED_ORDER 128 diff --git a/crypto/ec/ec_pmeth.c b/crypto/ec/ec_pmeth.c index 4110d5e4f0..689a173468 100644 --- a/crypto/ec/ec_pmeth.c +++ b/crypto/ec/ec_pmeth.c @@ -60,6 +60,7 @@ #include <openssl/asn1t.h> #include <openssl/x509.h> #include <openssl/ec.h> +#include "ec_lcl.h" #include <openssl/ecdsa.h> #include <openssl/evp.h> #include "evp_locl.h" @@ -72,6 +73,20 @@ typedef struct EC_GROUP *gen_group; /* message digest */ const EVP_MD *md; + /* Duplicate key if custom cofactor needed */ + EC_KEY *co_key; + /* Cofactor mode */ + char cofactor_mode; + /* KDF (if any) to use for ECDH */ + char kdf_type; + /* Message digest to use for key derivation */ + const EVP_MD *kdf_md; + /* User key material */ + unsigned char *kdf_ukm; + size_t kdf_ukmlen; + /* KDF output length */ + size_t kdf_outlen; + } EC_PKEY_CTX; static int pkey_ec_init(EVP_PKEY_CTX *ctx) @@ -83,6 +98,14 @@ static int pkey_ec_init(EVP_PKEY_CTX *ctx) dctx->gen_group = NULL; dctx->md = NULL; + dctx->cofactor_mode = -1; + dctx->co_key = NULL; + dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE; + dctx->kdf_md = NULL; + dctx->kdf_outlen = 0; + dctx->kdf_ukm = NULL; + dctx->kdf_ukmlen = 0; + ctx->data = dctx; return 1; @@ -102,6 +125,25 @@ static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) return 0; } dctx->md = sctx->md; + + if (sctx->co_key) + { + dctx->co_key = EC_KEY_dup(sctx->co_key); + if (!dctx->co_key) + return 0; + } + dctx->kdf_type = sctx->kdf_type; + dctx->kdf_md = sctx->kdf_md; + dctx->kdf_outlen = sctx->kdf_outlen; + if (sctx->kdf_ukm) + { + dctx->kdf_ukm = BUF_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen); + if (!dctx->kdf_ukm) + return 0; + } + else + dctx->kdf_ukm = NULL; + dctx->kdf_ukmlen = sctx->kdf_ukmlen; return 1; } @@ -112,6 +154,10 @@ static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) { if (dctx->gen_group) EC_GROUP_free(dctx->gen_group); + if (dctx->co_key) + EC_KEY_free(dctx->co_key); + if (dctx->kdf_ukm) + OPENSSL_free(dctx->kdf_ukm); OPENSSL_free(dctx); } } @@ -172,20 +218,23 @@ static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen) int ret; size_t outlen; const EC_POINT *pubkey = NULL; + EC_KEY *eckey; + EC_PKEY_CTX *dctx = ctx->data; if (!ctx->pkey || !ctx->peerkey) { ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET); return 0; } + eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec; + if (!key) { const EC_GROUP *group; - group = EC_KEY_get0_group(ctx->pkey->pkey.ec); + group = EC_KEY_get0_group(eckey); *keylen = (EC_GROUP_get_degree(group) + 7)/8; return 1; } - pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec); /* NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is @@ -194,13 +243,52 @@ static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen) outlen = *keylen; - ret = ECDH_compute_key(key, outlen, pubkey, ctx->pkey->pkey.ec, 0); + ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0); if (ret < 0) return ret; *keylen = ret; return 1; } +static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx, + unsigned char *key, size_t *keylen) + { + EC_PKEY_CTX *dctx = ctx->data; + unsigned char *ktmp = NULL; + size_t ktmplen; + int rv = 0; + if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE) + return pkey_ec_derive(ctx, key, keylen); + if (!key) + { + *keylen = dctx->kdf_outlen; + return 1; + } + if (*keylen != dctx->kdf_outlen) + return 0; + if (!pkey_ec_derive(ctx, NULL, &ktmplen)) + return 0; + ktmp = OPENSSL_malloc(ktmplen); + if (!ktmp) + return 0; + if (!pkey_ec_derive(ctx, ktmp, &ktmplen)) + goto err; + /* Do KDF stuff */ + if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen, + dctx->kdf_ukm, dctx->kdf_ukmlen, + dctx->kdf_md)) + goto err; + rv = 1; + + err: + if (ktmp) + { + OPENSSL_cleanse(ktmp, ktmplen); + OPENSSL_free(ktmp); + } + return rv; + } + static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) { EC_PKEY_CTX *dctx = ctx->data; @@ -228,6 +316,89 @@ static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) EC_GROUP_set_asn1_flag(dctx->gen_group, p1); return 1; + case EVP_PKEY_CTRL_EC_ECDH_COFACTOR: + if (p1 == -2) + { + if (dctx->co_key) + return dctx->cofactor_mode; + else + { + EC_KEY *ec_key = ctx->pkey->pkey.ec; + return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 : 0; + } + } + else if (p1 < -1 || p1 > 1) + return -2; + dctx->cofactor_mode = p1; + if (p1 != -1) + { + EC_KEY *ec_key = ctx->pkey->pkey.ec; + if (!ec_key->group) + return -2; + /* If cofactor is 1 cofactor mode does nothing */ + if (BN_is_one(&ec_key->group->cofactor)) + return 1; + if (!dctx->co_key) + { + dctx->co_key = EC_KEY_dup(ec_key); + if (!dctx->co_key) + return 0; + } + if (p1) + EC_KEY_set_flags(dctx->co_key, + EC_FLAG_COFACTOR_ECDH); + else + EC_KEY_clear_flags(dctx->co_key, + EC_FLAG_COFACTOR_ECDH); + } + else if (dctx->co_key) + { + EC_KEY_free(dctx->co_key); + dctx->co_key = NULL; + } + return 1; + + case EVP_PKEY_CTRL_EC_KDF_TYPE: + if (p1 == -2) + return dctx->kdf_type; + if (p1 != EVP_PKEY_ECDH_KDF_NONE && + p1 != EVP_PKEY_ECDH_KDF_X9_62) + return -2; + dctx->kdf_type = p1; + return 1; + + case EVP_PKEY_CTRL_EC_KDF_MD: + dctx->kdf_md = p2; + return 1; + + case EVP_PKEY_CTRL_GET_EC_KDF_MD: + *(const EVP_MD **)p2 = dctx->kdf_md; + return 1; + + case EVP_PKEY_CTRL_EC_KDF_OUTLEN: + if (p1 <= 0) + return -2; + dctx->kdf_outlen = (size_t)p1; + return 1; + + case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN: + *(int *)p2 = dctx->kdf_outlen; + return 1; + + case EVP_PKEY_CTRL_EC_KDF_UKM: + if (dctx->kdf_ukm) + OPENSSL_free(dctx->kdf_ukm); + dctx->kdf_ukm = p2; + if (p2) + dctx->kdf_ukmlen = p1; + else + dctx->kdf_ukmlen = 0; + return 1; + + case EVP_PKEY_CTRL_GET_EC_KDF_UKM: + *(unsigned char **)p2 = dctx->kdf_ukm; + return dctx->kdf_ukmlen; + case EVP_PKEY_CTRL_MD: if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 && EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 && @@ -369,7 +540,7 @@ const EVP_PKEY_METHOD ec_pkey_meth = 0,0, 0, - pkey_ec_derive, + pkey_ec_kdf_derive, pkey_ec_ctrl, pkey_ec_ctrl_str diff --git a/crypto/ecdh/Makefile b/crypto/ecdh/Makefile index 5dbaccc298..8ca7526eb3 100644 --- a/crypto/ecdh/Makefile +++ b/crypto/ecdh/Makefile @@ -17,9 +17,9 @@ TEST=ecdhtest.c APPS= LIB=$(TOP)/libcrypto.a -LIBSRC= ech_lib.c ech_ossl.c ech_key.c ech_err.c +LIBSRC= ech_lib.c ech_ossl.c ech_key.c ech_err.c ech_kdf.c -LIBOBJ= ech_lib.o ech_ossl.o ech_key.o ech_err.o +LIBOBJ= ech_lib.o ech_ossl.o ech_key.o ech_err.o ech_kdf.o SRC= $(LIBSRC) diff --git a/crypto/ecdh/ecdh.h b/crypto/ecdh/ecdh.h index 8ac82b8cbd..539e212c10 100644 --- a/crypto/ecdh/ecdh.h +++ b/crypto/ecdh/ecdh.h @@ -101,6 +101,11 @@ int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg); void *ECDH_get_ex_data(EC_KEY *d, int idx); +int ECDH_KDF_X9_62(unsigned char *out, size_t outlen, + const unsigned char *Z, size_t Zlen, + const unsigned char *sinfo, size_t sinfolen, + const EVP_MD *md); + /* BEGIN ERROR CODES */ /* The following lines are auto generated by the script mkerr.pl. Any changes diff --git a/crypto/ecdh/ech_kdf.c b/crypto/ecdh/ech_kdf.c new file mode 100644 index 0000000000..84bf108b90 --- /dev/null +++ b/crypto/ecdh/ech_kdf.c @@ -0,0 +1,116 @@ +/* crypto/ecdh/ec_kdf.c */ +/* + * Written by Stephen Henson for the OpenSSL project. + */ +/* ==================================================================== + * Copyright (c) 2013 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + */ + +#define OPENSSL_FIPSAPI + +#include <string.h> +#include <openssl/ecdh.h> +#include <openssl/evp.h> + + +/* Key derivation function from X9.62/SECG */ + +#define ECDH_KDF_MAX (1L << 31) + +int ECDH_KDF_X9_62(unsigned char *out, size_t outlen, + const unsigned char *Z, size_t Zlen, + const unsigned char *sinfo, size_t sinfolen, + const EVP_MD *md) + { + EVP_MD_CTX mctx; + int rv = 0; + unsigned int i; + size_t mdlen; + unsigned char ctr[4]; + if (sinfolen > ECDH_KDF_MAX || outlen > ECDH_KDF_MAX || Zlen > ECDH_KDF_MAX) + return 0; + mdlen = EVP_MD_size(md); + EVP_MD_CTX_init(&mctx); + for (i = 1;;i++) + { + unsigned char mtmp[EVP_MAX_MD_SIZE]; + EVP_DigestInit_ex(&mctx, md, NULL); + ctr[3] = i & 0xFF; + ctr[2] = (i >> 8) & 0xFF; + ctr[1] = (i >> 16) & 0xFF; + ctr[0] = (i >> 24) & 0xFF; + if (!EVP_DigestUpdate(&mctx, Z, Zlen)) + goto err; + if (!EVP_DigestUpdate(&mctx, ctr, sizeof(ctr))) + goto err; + if (!EVP_DigestUpdate(&mctx, sinfo, sinfolen)) + goto err; + if (outlen > mdlen) + { + if (!EVP_DigestFinal(&mctx, out, NULL)) + goto err; + outlen -= mdlen; + if (outlen == 0) + break; + out += mdlen; + } + else + { + if (!EVP_DigestFinal(&mctx, mtmp, NULL)) + goto err; + memcpy(out, mtmp, outlen); + OPENSSL_cleanse(mtmp, mdlen); + break; + } + } + rv = 1; + err: + EVP_MD_CTX_cleanup(&mctx); + return rv; + } + |