diff options
Diffstat (limited to 'src/crypto/evp/p_ec.c')
-rw-r--r-- | src/crypto/evp/p_ec.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/src/crypto/evp/p_ec.c b/src/crypto/evp/p_ec.c new file mode 100644 index 0000000..c274131 --- /dev/null +++ b/src/crypto/evp/p_ec.c @@ -0,0 +1,303 @@ +/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL + * project 2006. + */ +/* ==================================================================== + * Copyright (c) 2006 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 + * licensing@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. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). */ + +#include <openssl/evp.h> + +#include <string.h> + +#include <openssl/asn1.h> +#include <openssl/bn.h> +#include <openssl/buf.h> +#include <openssl/digest.h> +#include <openssl/ec.h> +#include <openssl/ec_key.h> +#include <openssl/ecdh.h> +#include <openssl/ecdsa.h> +#include <openssl/err.h> +#include <openssl/mem.h> +#include <openssl/obj.h> + +#include "internal.h" +#include "../ec/internal.h" + + +typedef struct { + /* Key and paramgen group */ + EC_GROUP *gen_group; + /* message digest */ + const EVP_MD *md; +} EC_PKEY_CTX; + + +static int pkey_ec_init(EVP_PKEY_CTX *ctx) { + EC_PKEY_CTX *dctx; + dctx = OPENSSL_malloc(sizeof(EC_PKEY_CTX)); + if (!dctx) { + return 0; + } + memset(dctx, 0, sizeof(EC_PKEY_CTX)); + + ctx->data = dctx; + + return 1; +} + +static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { + EC_PKEY_CTX *dctx, *sctx; + if (!pkey_ec_init(dst)) { + return 0; + } + sctx = src->data; + dctx = dst->data; + + if (sctx->gen_group) { + dctx->gen_group = EC_GROUP_dup(sctx->gen_group); + if (!dctx->gen_group) { + return 0; + } + } + dctx->md = sctx->md; + + return 1; +} + +static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx) { + EC_PKEY_CTX *dctx = ctx->data; + if (!dctx) { + return; + } + + if (dctx->gen_group) { + EC_GROUP_free(dctx->gen_group); + } + OPENSSL_free(dctx); +} + +static int pkey_ec_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, size_t *siglen, + const uint8_t *tbs, size_t tbslen) { + int type; + unsigned int sltmp; + EC_PKEY_CTX *dctx = ctx->data; + EC_KEY *ec = ctx->pkey->pkey.ec; + + if (!sig) { + *siglen = ECDSA_size(ec); + return 1; + } else if (*siglen < (size_t)ECDSA_size(ec)) { + OPENSSL_PUT_ERROR(EVP, pkey_ec_sign, EVP_R_BUFFER_TOO_SMALL); + return 0; + } + + type = NID_sha1; + if (dctx->md) { + type = EVP_MD_type(dctx->md); + } + + if (!ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec)) { + return 0; + } + *siglen = (size_t)sltmp; + return 1; +} + +static int pkey_ec_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig, size_t siglen, + const uint8_t *tbs, size_t tbslen) { + int type; + EC_PKEY_CTX *dctx = ctx->data; + EC_KEY *ec = ctx->pkey->pkey.ec; + + type = NID_sha1; + if (dctx->md) { + type = EVP_MD_type(dctx->md); + } + + return ECDSA_verify(type, tbs, tbslen, sig, siglen, ec); +} + +static int pkey_ec_derive(EVP_PKEY_CTX *ctx, uint8_t *key, + size_t *keylen) { + int ret; + size_t outlen; + const EC_POINT *pubkey = NULL; + EC_KEY *eckey; + + if (!ctx->pkey || !ctx->peerkey) { + OPENSSL_PUT_ERROR(EVP, pkey_ec_derive, EVP_R_KEYS_NOT_SET); + return 0; + } + + eckey = ctx->pkey->pkey.ec; + + if (!key) { + const EC_GROUP *group; + 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 + * not an error, the result is truncated. */ + + outlen = *keylen; + + ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0); + if (ret < 0) { + return 0; + } + *keylen = ret; + return 1; +} + +static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) { + EC_PKEY_CTX *dctx = ctx->data; + EC_GROUP *group; + + switch (type) { + case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID: + group = EC_GROUP_new_by_curve_name(p1); + if (group == NULL) { + OPENSSL_PUT_ERROR(EVP, pkey_ec_ctrl, EVP_R_INVALID_CURVE); + return 0; + } + if (dctx->gen_group) + EC_GROUP_free(dctx->gen_group); + dctx->gen_group = group; + return 1; + + 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 && + EVP_MD_type((const EVP_MD *)p2) != NID_sha224 && + EVP_MD_type((const EVP_MD *)p2) != NID_sha256 && + EVP_MD_type((const EVP_MD *)p2) != NID_sha384 && + EVP_MD_type((const EVP_MD *)p2) != NID_sha512) { + OPENSSL_PUT_ERROR(EVP, pkey_ec_ctrl, EVP_R_INVALID_DIGEST_TYPE); + return 0; + } + 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: + return 1; + + default: + return -2; + } +} + +static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { + EC_KEY *ec = NULL; + EC_PKEY_CTX *dctx = ctx->data; + int ret = 0; + + if (dctx->gen_group == NULL) { + OPENSSL_PUT_ERROR(EVP, pkey_ec_paramgen, EVP_R_NO_PARAMETERS_SET); + return 0; + } + ec = EC_KEY_new(); + if (!ec) { + return 0; + } + ret = EC_KEY_set_group(ec, dctx->gen_group); + if (ret) { + EVP_PKEY_assign_EC_KEY(pkey, ec); + } else { + EC_KEY_free(ec); + } + return ret; +} + +static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { + EC_KEY *ec = NULL; + EC_PKEY_CTX *dctx = ctx->data; + if (ctx->pkey == NULL && dctx->gen_group == NULL) { + OPENSSL_PUT_ERROR(EVP, pkey_ec_keygen, EVP_R_NO_PARAMETERS_SET); + return 0; + } + ec = EC_KEY_new(); + if (!ec) { + return 0; + } + EVP_PKEY_assign_EC_KEY(pkey, ec); + 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); +} + +const EVP_PKEY_METHOD ec_pkey_meth = { + EVP_PKEY_EC, 0 /* flags */, pkey_ec_init, + pkey_ec_copy, pkey_ec_cleanup, 0 /* paramgen_init */, + pkey_ec_paramgen, 0 /* keygen_init */, pkey_ec_keygen, + 0 /* sign_init */, pkey_ec_sign, 0 /* verify_init */, + pkey_ec_verify, 0 /* signctx_init */, 0 /* signctx */, + 0 /* verifyctx_init */, 0 /* verifyctx */, 0 /* encrypt_init */, + 0 /* encrypt */, 0 /* decrypt_init */, 0 /* decrypt */, + 0 /* derive_init */, pkey_ec_derive, pkey_ec_ctrl, +}; 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