| /* |
| * Copyright 2006-2021 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 |
| */ |
| |
| #include "internal/cryptlib.h" |
| #include <openssl/asn1t.h> |
| #include <openssl/ec.h> |
| #include <openssl/evp.h> |
| #include "crypto/evp.h" |
| #include "crypto/sm2.h" |
| #include "crypto/sm2err.h" |
| |
| /* EC pkey context structure */ |
| |
| typedef struct { |
| /* Key and paramgen group */ |
| EC_GROUP *gen_group; |
| /* message digest */ |
| const EVP_MD *md; |
| /* Distinguishing Identifier, ISO/IEC 15946-3 */ |
| uint8_t *id; |
| size_t id_len; |
| /* id_set indicates if the 'id' field is set (1) or not (0) */ |
| int id_set; |
| } SM2_PKEY_CTX; |
| |
| static int pkey_sm2_init(EVP_PKEY_CTX *ctx) |
| { |
| SM2_PKEY_CTX *smctx; |
| |
| if ((smctx = OPENSSL_zalloc(sizeof(*smctx))) == NULL) { |
| SM2err(SM2_F_PKEY_SM2_INIT, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| |
| ctx->data = smctx; |
| return 1; |
| } |
| |
| static void pkey_sm2_cleanup(EVP_PKEY_CTX *ctx) |
| { |
| SM2_PKEY_CTX *smctx = ctx->data; |
| |
| if (smctx != NULL) { |
| EC_GROUP_free(smctx->gen_group); |
| OPENSSL_free(smctx->id); |
| OPENSSL_free(smctx); |
| ctx->data = NULL; |
| } |
| } |
| |
| static int pkey_sm2_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) |
| { |
| SM2_PKEY_CTX *dctx, *sctx; |
| |
| if (!pkey_sm2_init(dst)) |
| return 0; |
| sctx = src->data; |
| dctx = dst->data; |
| if (sctx->gen_group != NULL) { |
| dctx->gen_group = EC_GROUP_dup(sctx->gen_group); |
| if (dctx->gen_group == NULL) { |
| pkey_sm2_cleanup(dst); |
| return 0; |
| } |
| } |
| if (sctx->id != NULL) { |
| dctx->id = OPENSSL_malloc(sctx->id_len); |
| if (dctx->id == NULL) { |
| SM2err(SM2_F_PKEY_SM2_COPY, ERR_R_MALLOC_FAILURE); |
| pkey_sm2_cleanup(dst); |
| return 0; |
| } |
| memcpy(dctx->id, sctx->id, sctx->id_len); |
| } |
| dctx->id_len = sctx->id_len; |
| dctx->id_set = sctx->id_set; |
| dctx->md = sctx->md; |
| |
| return 1; |
| } |
| |
| static int pkey_sm2_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, |
| const unsigned char *tbs, size_t tbslen) |
| { |
| int ret; |
| unsigned int sltmp; |
| EC_KEY *ec = ctx->pkey->pkey.ec; |
| const int sig_sz = ECDSA_size(ctx->pkey->pkey.ec); |
| |
| if (sig_sz <= 0) { |
| return 0; |
| } |
| |
| if (sig == NULL) { |
| *siglen = (size_t)sig_sz; |
| return 1; |
| } |
| |
| if (*siglen < (size_t)sig_sz) { |
| SM2err(SM2_F_PKEY_SM2_SIGN, SM2_R_BUFFER_TOO_SMALL); |
| return 0; |
| } |
| |
| ret = sm2_sign(tbs, tbslen, sig, &sltmp, ec); |
| |
| if (ret <= 0) |
| return ret; |
| *siglen = (size_t)sltmp; |
| return 1; |
| } |
| |
| static int pkey_sm2_verify(EVP_PKEY_CTX *ctx, |
| const unsigned char *sig, size_t siglen, |
| const unsigned char *tbs, size_t tbslen) |
| { |
| EC_KEY *ec = ctx->pkey->pkey.ec; |
| |
| return sm2_verify(tbs, tbslen, sig, siglen, ec); |
| } |
| |
| static int pkey_sm2_encrypt(EVP_PKEY_CTX *ctx, |
| unsigned char *out, size_t *outlen, |
| const unsigned char *in, size_t inlen) |
| { |
| EC_KEY *ec = ctx->pkey->pkey.ec; |
| SM2_PKEY_CTX *dctx = ctx->data; |
| const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md; |
| |
| if (out == NULL) { |
| if (!sm2_ciphertext_size(ec, md, inlen, outlen)) |
| return -1; |
| else |
| return 1; |
| } |
| |
| return sm2_encrypt(ec, md, in, inlen, out, outlen); |
| } |
| |
| static int pkey_sm2_decrypt(EVP_PKEY_CTX *ctx, |
| unsigned char *out, size_t *outlen, |
| const unsigned char *in, size_t inlen) |
| { |
| EC_KEY *ec = ctx->pkey->pkey.ec; |
| SM2_PKEY_CTX *dctx = ctx->data; |
| const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md; |
| |
| if (out == NULL) { |
| if (!sm2_plaintext_size(in, inlen, outlen)) |
| return -1; |
| else |
| return 1; |
| } |
| |
| return sm2_decrypt(ec, md, in, inlen, out, outlen); |
| } |
| |
| static int pkey_sm2_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) |
| { |
| SM2_PKEY_CTX *smctx = ctx->data; |
| EC_GROUP *group; |
| uint8_t *tmp_id; |
| |
| switch (type) { |
| case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID: |
| group = EC_GROUP_new_by_curve_name(p1); |
| if (group == NULL) { |
| SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_INVALID_CURVE); |
| return 0; |
| } |
| EC_GROUP_free(smctx->gen_group); |
| smctx->gen_group = group; |
| return 1; |
| |
| case EVP_PKEY_CTRL_EC_PARAM_ENC: |
| if (smctx->gen_group == NULL) { |
| SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_NO_PARAMETERS_SET); |
| return 0; |
| } |
| EC_GROUP_set_asn1_flag(smctx->gen_group, p1); |
| return 1; |
| |
| case EVP_PKEY_CTRL_MD: |
| smctx->md = p2; |
| return 1; |
| |
| case EVP_PKEY_CTRL_GET_MD: |
| *(const EVP_MD **)p2 = smctx->md; |
| return 1; |
| |
| case EVP_PKEY_CTRL_SET1_ID: |
| if (p1 > 0) { |
| tmp_id = OPENSSL_malloc(p1); |
| if (tmp_id == NULL) { |
| SM2err(SM2_F_PKEY_SM2_CTRL, ERR_R_MALLOC_FAILURE); |
| return 0; |
| } |
| memcpy(tmp_id, p2, p1); |
| OPENSSL_free(smctx->id); |
| smctx->id = tmp_id; |
| } else { |
| /* set null-ID */ |
| OPENSSL_free(smctx->id); |
| smctx->id = NULL; |
| } |
| smctx->id_len = (size_t)p1; |
| smctx->id_set = 1; |
| return 1; |
| |
| case EVP_PKEY_CTRL_GET1_ID: |
| memcpy(p2, smctx->id, smctx->id_len); |
| return 1; |
| |
| case EVP_PKEY_CTRL_GET1_ID_LEN: |
| *(size_t *)p2 = smctx->id_len; |
| return 1; |
| |
| case EVP_PKEY_CTRL_DIGESTINIT: |
| /* nothing to be inited, this is to suppress the error... */ |
| return 1; |
| |
| default: |
| return -2; |
| } |
| } |
| |
| static int pkey_sm2_ctrl_str(EVP_PKEY_CTX *ctx, |
| const char *type, const char *value) |
| { |
| if (strcmp(type, "ec_paramgen_curve") == 0) { |
| int nid = NID_undef; |
| |
| if (((nid = EC_curve_nist2nid(value)) == NID_undef) |
| && ((nid = OBJ_sn2nid(value)) == NID_undef) |
| && ((nid = OBJ_ln2nid(value)) == NID_undef)) { |
| SM2err(SM2_F_PKEY_SM2_CTRL_STR, SM2_R_INVALID_CURVE); |
| return 0; |
| } |
| return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid); |
| } else if (strcmp(type, "ec_param_enc") == 0) { |
| int param_enc; |
| |
| if (strcmp(value, "explicit") == 0) |
| param_enc = 0; |
| else if (strcmp(value, "named_curve") == 0) |
| param_enc = OPENSSL_EC_NAMED_CURVE; |
| else |
| return -2; |
| return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc); |
| } |
| |
| return -2; |
| } |
| |
| static int pkey_sm2_digest_custom(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx) |
| { |
| uint8_t z[EVP_MAX_MD_SIZE]; |
| SM2_PKEY_CTX *smctx = ctx->data; |
| EC_KEY *ec = ctx->pkey->pkey.ec; |
| const EVP_MD *md = EVP_MD_CTX_md(mctx); |
| int mdlen = EVP_MD_size(md); |
| |
| if (!smctx->id_set) { |
| /* |
| * An ID value must be set. The specifications are not clear whether a |
| * NULL is allowed. We only allow it if set explicitly for maximum |
| * flexibility. |
| */ |
| SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_ID_NOT_SET); |
| return 0; |
| } |
| |
| if (mdlen < 0) { |
| SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_INVALID_DIGEST); |
| return 0; |
| } |
| |
| /* get hashed prefix 'z' of tbs message */ |
| if (!sm2_compute_z_digest(z, md, smctx->id, smctx->id_len, ec)) |
| return 0; |
| |
| return EVP_DigestUpdate(mctx, z, (size_t)mdlen); |
| } |
| |
| const EVP_PKEY_METHOD sm2_pkey_meth = { |
| EVP_PKEY_SM2, |
| 0, |
| pkey_sm2_init, |
| pkey_sm2_copy, |
| pkey_sm2_cleanup, |
| |
| 0, |
| 0, |
| |
| 0, |
| 0, |
| |
| 0, |
| pkey_sm2_sign, |
| |
| 0, |
| pkey_sm2_verify, |
| |
| 0, 0, |
| |
| 0, 0, 0, 0, |
| |
| 0, |
| pkey_sm2_encrypt, |
| |
| 0, |
| pkey_sm2_decrypt, |
| |
| 0, |
| 0, |
| pkey_sm2_ctrl, |
| pkey_sm2_ctrl_str, |
| |
| 0, 0, |
| |
| 0, 0, 0, |
| |
| pkey_sm2_digest_custom |
| }; |