diff options
Diffstat (limited to 'drivers/builtin_openssl2/crypto/ec/ec_pmeth.c')
| -rw-r--r-- | drivers/builtin_openssl2/crypto/ec/ec_pmeth.c | 220 |
1 files changed, 209 insertions, 11 deletions
diff --git a/drivers/builtin_openssl2/crypto/ec/ec_pmeth.c b/drivers/builtin_openssl2/crypto/ec/ec_pmeth.c index c189d3ffbf..b76749010c 100644 --- a/drivers/builtin_openssl2/crypto/ec/ec_pmeth.c +++ b/drivers/builtin_openssl2/crypto/ec/ec_pmeth.c @@ -61,6 +61,7 @@ #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 +73,19 @@ typedef struct { EC_GROUP *gen_group; /* message digest */ const EVP_MD *md; + /* Duplicate key if custom cofactor needed */ + EC_KEY *co_key; + /* Cofactor mode */ + signed 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 +97,14 @@ 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; @@ -101,6 +123,22 @@ 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; } @@ -110,6 +148,10 @@ static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) if (dctx) { 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); } } @@ -168,18 +210,21 @@ static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, 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); /* @@ -189,12 +234,48 @@ static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, outlen = *keylen; - ret = ECDH_compute_key(key, outlen, pubkey, ctx->pkey->pkey.ec, 0); - if (ret < 0) - return ret; + ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0); + if (ret <= 0) + return 0; *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; +} #endif static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) @@ -213,6 +294,90 @@ static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) dctx->gen_group = group; return 1; + case EVP_PKEY_CTRL_EC_PARAM_ENC: + if (!dctx->gen_group) { + ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET); + return 0; + } + EC_GROUP_set_asn1_flag(dctx->gen_group, p1); + return 1; + +#ifndef OPENSSL_NO_ECDH + case EVP_PKEY_CTRL_EC_ECDH_COFACTOR: + if (p1 == -2) { + if (dctx->cofactor_mode != -1) + 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; +#endif + + 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 && @@ -226,6 +391,10 @@ static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) dctx->md = p2; return 1; + case EVP_PKEY_CTRL_GET_MD: + *(const EVP_MD **)p2 = dctx->md; + return 1; + case EVP_PKEY_CTRL_PEER_KEY: /* Default behaviour is OK */ case EVP_PKEY_CTRL_DIGESTINIT: @@ -244,7 +413,9 @@ static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx, { if (!strcmp(type, "ec_paramgen_curve")) { int nid; - nid = OBJ_sn2nid(value); + nid = EC_curve_nist2nid(value); + if (nid == NID_undef) + nid = OBJ_sn2nid(value); if (nid == NID_undef) nid = OBJ_ln2nid(value); if (nid == NID_undef) { @@ -252,7 +423,28 @@ static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx, return 0; } return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid); + } else if (!strcmp(type, "ec_param_enc")) { + int param_enc; + if (!strcmp(value, "explicit")) + param_enc = 0; + else if (!strcmp(value, "named_curve")) + param_enc = OPENSSL_EC_NAMED_CURVE; + else + return -2; + return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc); + } else if (!strcmp(type, "ecdh_kdf_md")) { + const EVP_MD *md; + if (!(md = EVP_get_digestbyname(value))) { + ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST); + return 0; + } + return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md); + } else if (!strcmp(type, "ecdh_cofactor_mode")) { + int co_mode; + co_mode = atoi(value); + return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode); } + return -2; } @@ -279,7 +471,8 @@ static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { EC_KEY *ec = NULL; - if (ctx->pkey == NULL) { + EC_PKEY_CTX *dctx = ctx->data; + if (ctx->pkey == NULL && dctx->gen_group == NULL) { ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET); return 0; } @@ -287,9 +480,14 @@ static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) if (!ec) return 0; EVP_PKEY_assign_EC_KEY(pkey, ec); - /* Note: if error return, pkey is freed by parent routine */ - if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey)) - return 0; + if (ctx->pkey) { + /* Note: if error return, pkey is freed by parent routine */ + if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey)) + return 0; + } else { + if (!EC_KEY_set_group(ec, dctx->gen_group)) + return 0; + } return EC_KEY_generate_key(pkey->pkey.ec); } @@ -322,7 +520,7 @@ const EVP_PKEY_METHOD ec_pkey_meth = { 0, #ifndef OPENSSL_NO_ECDH - pkey_ec_derive, + pkey_ec_kdf_derive, #else 0, #endif |