667 lines
19 KiB
C
667 lines
19 KiB
C
/*
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* Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/x509.h>
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#include <openssl/rsa.h>
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#include <openssl/bn.h>
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#include <openssl/evp.h>
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#include <openssl/x509v3.h>
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#include <openssl/cms.h>
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#include "internal/evp_int.h"
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#include "rsa_locl.h"
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/* RSA pkey context structure */
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typedef struct {
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/* Key gen parameters */
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int nbits;
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BIGNUM *pub_exp;
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/* Keygen callback info */
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int gentmp[2];
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/* RSA padding mode */
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int pad_mode;
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/* message digest */
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const EVP_MD *md;
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/* message digest for MGF1 */
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const EVP_MD *mgf1md;
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/* PSS salt length */
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int saltlen;
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/* Temp buffer */
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unsigned char *tbuf;
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/* OAEP label */
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unsigned char *oaep_label;
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size_t oaep_labellen;
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} RSA_PKEY_CTX;
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static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
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{
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RSA_PKEY_CTX *rctx;
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rctx = OPENSSL_zalloc(sizeof(*rctx));
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if (rctx == NULL)
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return 0;
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rctx->nbits = 1024;
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rctx->pad_mode = RSA_PKCS1_PADDING;
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rctx->saltlen = -2;
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ctx->data = rctx;
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ctx->keygen_info = rctx->gentmp;
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ctx->keygen_info_count = 2;
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return 1;
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}
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static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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RSA_PKEY_CTX *dctx, *sctx;
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if (!pkey_rsa_init(dst))
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return 0;
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sctx = src->data;
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dctx = dst->data;
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dctx->nbits = sctx->nbits;
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if (sctx->pub_exp) {
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dctx->pub_exp = BN_dup(sctx->pub_exp);
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if (!dctx->pub_exp)
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return 0;
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}
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dctx->pad_mode = sctx->pad_mode;
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dctx->md = sctx->md;
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dctx->mgf1md = sctx->mgf1md;
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if (sctx->oaep_label) {
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OPENSSL_free(dctx->oaep_label);
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dctx->oaep_label = OPENSSL_memdup(sctx->oaep_label, sctx->oaep_labellen);
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if (!dctx->oaep_label)
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return 0;
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dctx->oaep_labellen = sctx->oaep_labellen;
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}
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return 1;
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}
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static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
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{
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if (ctx->tbuf)
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return 1;
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ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
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if (ctx->tbuf == NULL)
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return 0;
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return 1;
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}
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static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
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{
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RSA_PKEY_CTX *rctx = ctx->data;
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if (rctx) {
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BN_free(rctx->pub_exp);
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OPENSSL_free(rctx->tbuf);
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OPENSSL_free(rctx->oaep_label);
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OPENSSL_free(rctx);
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}
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}
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static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig,
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size_t *siglen, const unsigned char *tbs,
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size_t tbslen)
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{
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int ret;
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RSA_PKEY_CTX *rctx = ctx->data;
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RSA *rsa = ctx->pkey->pkey.rsa;
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if (rctx->md) {
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if (tbslen != (size_t)EVP_MD_size(rctx->md)) {
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RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_INVALID_DIGEST_LENGTH);
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return -1;
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}
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if (EVP_MD_type(rctx->md) == NID_mdc2) {
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unsigned int sltmp;
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if (rctx->pad_mode != RSA_PKCS1_PADDING)
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return -1;
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ret = RSA_sign_ASN1_OCTET_STRING(0,
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tbs, tbslen, sig, &sltmp, rsa);
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if (ret <= 0)
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return ret;
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ret = sltmp;
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} else if (rctx->pad_mode == RSA_X931_PADDING) {
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if ((size_t)EVP_PKEY_size(ctx->pkey) < tbslen + 1) {
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RSAerr(RSA_F_PKEY_RSA_SIGN, RSA_R_KEY_SIZE_TOO_SMALL);
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return -1;
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}
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if (!setup_tbuf(rctx, ctx)) {
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RSAerr(RSA_F_PKEY_RSA_SIGN, ERR_R_MALLOC_FAILURE);
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return -1;
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}
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memcpy(rctx->tbuf, tbs, tbslen);
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rctx->tbuf[tbslen] = RSA_X931_hash_id(EVP_MD_type(rctx->md));
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ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
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sig, rsa, RSA_X931_PADDING);
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} else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
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unsigned int sltmp;
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ret = RSA_sign(EVP_MD_type(rctx->md),
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tbs, tbslen, sig, &sltmp, rsa);
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if (ret <= 0)
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return ret;
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ret = sltmp;
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} else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
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if (!setup_tbuf(rctx, ctx))
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return -1;
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if (!RSA_padding_add_PKCS1_PSS_mgf1(rsa,
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rctx->tbuf, tbs,
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rctx->md, rctx->mgf1md,
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rctx->saltlen))
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return -1;
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ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
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sig, rsa, RSA_NO_PADDING);
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} else
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return -1;
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} else
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ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
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rctx->pad_mode);
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if (ret < 0)
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return ret;
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*siglen = ret;
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return 1;
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}
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static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
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unsigned char *rout, size_t *routlen,
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const unsigned char *sig, size_t siglen)
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{
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int ret;
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RSA_PKEY_CTX *rctx = ctx->data;
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if (rctx->md) {
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if (rctx->pad_mode == RSA_X931_PADDING) {
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if (!setup_tbuf(rctx, ctx))
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return -1;
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ret = RSA_public_decrypt(siglen, sig,
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rctx->tbuf, ctx->pkey->pkey.rsa,
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RSA_X931_PADDING);
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if (ret < 1)
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return 0;
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ret--;
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if (rctx->tbuf[ret] != RSA_X931_hash_id(EVP_MD_type(rctx->md))) {
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RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
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RSA_R_ALGORITHM_MISMATCH);
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return 0;
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}
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if (ret != EVP_MD_size(rctx->md)) {
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RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
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RSA_R_INVALID_DIGEST_LENGTH);
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return 0;
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}
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if (rout)
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memcpy(rout, rctx->tbuf, ret);
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} else if (rctx->pad_mode == RSA_PKCS1_PADDING) {
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size_t sltmp;
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ret = int_rsa_verify(EVP_MD_type(rctx->md),
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NULL, 0, rout, &sltmp,
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sig, siglen, ctx->pkey->pkey.rsa);
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if (ret <= 0)
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return 0;
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ret = sltmp;
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} else
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return -1;
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} else
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ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
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rctx->pad_mode);
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if (ret < 0)
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return ret;
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*routlen = ret;
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return 1;
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}
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static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
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const unsigned char *sig, size_t siglen,
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const unsigned char *tbs, size_t tbslen)
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{
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RSA_PKEY_CTX *rctx = ctx->data;
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RSA *rsa = ctx->pkey->pkey.rsa;
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size_t rslen;
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if (rctx->md) {
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if (rctx->pad_mode == RSA_PKCS1_PADDING)
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return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
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sig, siglen, rsa);
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if (rctx->pad_mode == RSA_X931_PADDING) {
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if (pkey_rsa_verifyrecover(ctx, NULL, &rslen, sig, siglen) <= 0)
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return 0;
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} else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING) {
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int ret;
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if (!setup_tbuf(rctx, ctx))
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return -1;
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ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
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rsa, RSA_NO_PADDING);
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if (ret <= 0)
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return 0;
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ret = RSA_verify_PKCS1_PSS_mgf1(rsa, tbs,
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rctx->md, rctx->mgf1md,
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rctx->tbuf, rctx->saltlen);
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if (ret <= 0)
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return 0;
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return 1;
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} else
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return -1;
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} else {
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if (!setup_tbuf(rctx, ctx))
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return -1;
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rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
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rsa, rctx->pad_mode);
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if (rslen == 0)
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return 0;
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}
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if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
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return 0;
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return 1;
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}
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static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
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unsigned char *out, size_t *outlen,
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const unsigned char *in, size_t inlen)
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{
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int ret;
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RSA_PKEY_CTX *rctx = ctx->data;
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if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
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int klen = RSA_size(ctx->pkey->pkey.rsa);
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if (!setup_tbuf(rctx, ctx))
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return -1;
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if (!RSA_padding_add_PKCS1_OAEP_mgf1(rctx->tbuf, klen,
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in, inlen,
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rctx->oaep_label,
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rctx->oaep_labellen,
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rctx->md, rctx->mgf1md))
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return -1;
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ret = RSA_public_encrypt(klen, rctx->tbuf, out,
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ctx->pkey->pkey.rsa, RSA_NO_PADDING);
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} else
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ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
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rctx->pad_mode);
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if (ret < 0)
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return ret;
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*outlen = ret;
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return 1;
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}
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static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
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unsigned char *out, size_t *outlen,
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const unsigned char *in, size_t inlen)
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{
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int ret;
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RSA_PKEY_CTX *rctx = ctx->data;
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if (rctx->pad_mode == RSA_PKCS1_OAEP_PADDING) {
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int i;
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if (!setup_tbuf(rctx, ctx))
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return -1;
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ret = RSA_private_decrypt(inlen, in, rctx->tbuf,
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ctx->pkey->pkey.rsa, RSA_NO_PADDING);
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if (ret <= 0)
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return ret;
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for (i = 0; i < ret; i++) {
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if (rctx->tbuf[i])
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break;
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}
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ret = RSA_padding_check_PKCS1_OAEP_mgf1(out, ret, rctx->tbuf + i,
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ret - i, ret,
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rctx->oaep_label,
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rctx->oaep_labellen,
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rctx->md, rctx->mgf1md);
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} else
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ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
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rctx->pad_mode);
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if (ret < 0)
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return ret;
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*outlen = ret;
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return 1;
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}
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static int check_padding_md(const EVP_MD *md, int padding)
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{
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int mdnid;
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if (!md)
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return 1;
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mdnid = EVP_MD_type(md);
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if (padding == RSA_NO_PADDING) {
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RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
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return 0;
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}
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if (padding == RSA_X931_PADDING) {
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if (RSA_X931_hash_id(mdnid) == -1) {
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RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_X931_DIGEST);
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return 0;
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}
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} else {
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switch(mdnid) {
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/* List of all supported RSA digests */
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case NID_sha1:
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case NID_sha224:
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case NID_sha256:
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case NID_sha384:
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case NID_sha512:
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case NID_md5:
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case NID_md5_sha1:
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case NID_md2:
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case NID_md4:
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case NID_mdc2:
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case NID_ripemd160:
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return 1;
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default:
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RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_DIGEST);
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return 0;
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}
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}
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return 1;
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}
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static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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RSA_PKEY_CTX *rctx = ctx->data;
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switch (type) {
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case EVP_PKEY_CTRL_RSA_PADDING:
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if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
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if (!check_padding_md(rctx->md, p1))
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return 0;
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if (p1 == RSA_PKCS1_PSS_PADDING) {
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if (!(ctx->operation &
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(EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
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goto bad_pad;
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if (!rctx->md)
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rctx->md = EVP_sha1();
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}
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if (p1 == RSA_PKCS1_OAEP_PADDING) {
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if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
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goto bad_pad;
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if (!rctx->md)
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rctx->md = EVP_sha1();
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}
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rctx->pad_mode = p1;
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return 1;
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}
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bad_pad:
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RSAerr(RSA_F_PKEY_RSA_CTRL,
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RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
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return -2;
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case EVP_PKEY_CTRL_GET_RSA_PADDING:
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*(int *)p2 = rctx->pad_mode;
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return 1;
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case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
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case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
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if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
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RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
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return -2;
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}
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if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN)
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*(int *)p2 = rctx->saltlen;
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else {
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if (p1 < -2)
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return -2;
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rctx->saltlen = p1;
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}
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return 1;
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case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
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if (p1 < 512) {
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RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
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return -2;
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}
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rctx->nbits = p1;
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return 1;
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case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
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if (!p2)
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return -2;
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BN_free(rctx->pub_exp);
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rctx->pub_exp = p2;
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return 1;
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case EVP_PKEY_CTRL_RSA_OAEP_MD:
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case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
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if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
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RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
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return -2;
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}
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if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
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*(const EVP_MD **)p2 = rctx->md;
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else
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rctx->md = p2;
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return 1;
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case EVP_PKEY_CTRL_MD:
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if (!check_padding_md(p2, rctx->pad_mode))
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return 0;
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rctx->md = p2;
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return 1;
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case EVP_PKEY_CTRL_GET_MD:
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*(const EVP_MD **)p2 = rctx->md;
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return 1;
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case EVP_PKEY_CTRL_RSA_MGF1_MD:
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case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
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if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
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&& rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
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RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
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return -2;
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}
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if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
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if (rctx->mgf1md)
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*(const EVP_MD **)p2 = rctx->mgf1md;
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else
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*(const EVP_MD **)p2 = rctx->md;
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} else
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rctx->mgf1md = p2;
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return 1;
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case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
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if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
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RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
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return -2;
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}
|
|
OPENSSL_free(rctx->oaep_label);
|
|
if (p2 && p1 > 0) {
|
|
rctx->oaep_label = p2;
|
|
rctx->oaep_labellen = p1;
|
|
} else {
|
|
rctx->oaep_label = NULL;
|
|
rctx->oaep_labellen = 0;
|
|
}
|
|
return 1;
|
|
|
|
case EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL:
|
|
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
|
|
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
|
|
return -2;
|
|
}
|
|
*(unsigned char **)p2 = rctx->oaep_label;
|
|
return rctx->oaep_labellen;
|
|
|
|
case EVP_PKEY_CTRL_DIGESTINIT:
|
|
case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
|
|
case EVP_PKEY_CTRL_PKCS7_DECRYPT:
|
|
case EVP_PKEY_CTRL_PKCS7_SIGN:
|
|
return 1;
|
|
#ifndef OPENSSL_NO_CMS
|
|
case EVP_PKEY_CTRL_CMS_DECRYPT:
|
|
case EVP_PKEY_CTRL_CMS_ENCRYPT:
|
|
case EVP_PKEY_CTRL_CMS_SIGN:
|
|
return 1;
|
|
#endif
|
|
case EVP_PKEY_CTRL_PEER_KEY:
|
|
RSAerr(RSA_F_PKEY_RSA_CTRL,
|
|
RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
|
|
return -2;
|
|
|
|
default:
|
|
return -2;
|
|
|
|
}
|
|
}
|
|
|
|
static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
|
|
const char *type, const char *value)
|
|
{
|
|
if (!value) {
|
|
RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
|
|
return 0;
|
|
}
|
|
if (strcmp(type, "rsa_padding_mode") == 0) {
|
|
int pm;
|
|
if (strcmp(value, "pkcs1") == 0)
|
|
pm = RSA_PKCS1_PADDING;
|
|
else if (strcmp(value, "sslv23") == 0)
|
|
pm = RSA_SSLV23_PADDING;
|
|
else if (strcmp(value, "none") == 0)
|
|
pm = RSA_NO_PADDING;
|
|
else if (strcmp(value, "oeap") == 0)
|
|
pm = RSA_PKCS1_OAEP_PADDING;
|
|
else if (strcmp(value, "oaep") == 0)
|
|
pm = RSA_PKCS1_OAEP_PADDING;
|
|
else if (strcmp(value, "x931") == 0)
|
|
pm = RSA_X931_PADDING;
|
|
else if (strcmp(value, "pss") == 0)
|
|
pm = RSA_PKCS1_PSS_PADDING;
|
|
else {
|
|
RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_UNKNOWN_PADDING_TYPE);
|
|
return -2;
|
|
}
|
|
return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
|
|
}
|
|
|
|
if (strcmp(type, "rsa_pss_saltlen") == 0) {
|
|
int saltlen;
|
|
saltlen = atoi(value);
|
|
return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
|
|
}
|
|
|
|
if (strcmp(type, "rsa_keygen_bits") == 0) {
|
|
int nbits;
|
|
nbits = atoi(value);
|
|
return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
|
|
}
|
|
|
|
if (strcmp(type, "rsa_keygen_pubexp") == 0) {
|
|
int ret;
|
|
BIGNUM *pubexp = NULL;
|
|
if (!BN_asc2bn(&pubexp, value))
|
|
return 0;
|
|
ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
|
|
if (ret <= 0)
|
|
BN_free(pubexp);
|
|
return ret;
|
|
}
|
|
|
|
if (strcmp(type, "rsa_mgf1_md") == 0) {
|
|
const EVP_MD *md;
|
|
if ((md = EVP_get_digestbyname(value)) == NULL) {
|
|
RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
|
|
return 0;
|
|
}
|
|
return EVP_PKEY_CTX_set_rsa_mgf1_md(ctx, md);
|
|
}
|
|
|
|
if (strcmp(type, "rsa_oaep_md") == 0) {
|
|
const EVP_MD *md;
|
|
if ((md = EVP_get_digestbyname(value)) == NULL) {
|
|
RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_INVALID_DIGEST);
|
|
return 0;
|
|
}
|
|
return EVP_PKEY_CTX_set_rsa_oaep_md(ctx, md);
|
|
}
|
|
if (strcmp(type, "rsa_oaep_label") == 0) {
|
|
unsigned char *lab;
|
|
long lablen;
|
|
int ret;
|
|
lab = OPENSSL_hexstr2buf(value, &lablen);
|
|
if (!lab)
|
|
return 0;
|
|
ret = EVP_PKEY_CTX_set0_rsa_oaep_label(ctx, lab, lablen);
|
|
if (ret <= 0)
|
|
OPENSSL_free(lab);
|
|
return ret;
|
|
}
|
|
|
|
return -2;
|
|
}
|
|
|
|
static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
|
|
{
|
|
RSA *rsa = NULL;
|
|
RSA_PKEY_CTX *rctx = ctx->data;
|
|
BN_GENCB *pcb;
|
|
int ret;
|
|
if (rctx->pub_exp == NULL) {
|
|
rctx->pub_exp = BN_new();
|
|
if (rctx->pub_exp == NULL || !BN_set_word(rctx->pub_exp, RSA_F4))
|
|
return 0;
|
|
}
|
|
rsa = RSA_new();
|
|
if (rsa == NULL)
|
|
return 0;
|
|
if (ctx->pkey_gencb) {
|
|
pcb = BN_GENCB_new();
|
|
if (pcb == NULL) {
|
|
RSA_free(rsa);
|
|
return 0;
|
|
}
|
|
evp_pkey_set_cb_translate(pcb, ctx);
|
|
} else
|
|
pcb = NULL;
|
|
ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
|
|
BN_GENCB_free(pcb);
|
|
if (ret > 0)
|
|
EVP_PKEY_assign_RSA(pkey, rsa);
|
|
else
|
|
RSA_free(rsa);
|
|
return ret;
|
|
}
|
|
|
|
const EVP_PKEY_METHOD rsa_pkey_meth = {
|
|
EVP_PKEY_RSA,
|
|
EVP_PKEY_FLAG_AUTOARGLEN,
|
|
pkey_rsa_init,
|
|
pkey_rsa_copy,
|
|
pkey_rsa_cleanup,
|
|
|
|
0, 0,
|
|
|
|
0,
|
|
pkey_rsa_keygen,
|
|
|
|
0,
|
|
pkey_rsa_sign,
|
|
|
|
0,
|
|
pkey_rsa_verify,
|
|
|
|
0,
|
|
pkey_rsa_verifyrecover,
|
|
|
|
0, 0, 0, 0,
|
|
|
|
0,
|
|
pkey_rsa_encrypt,
|
|
|
|
0,
|
|
pkey_rsa_decrypt,
|
|
|
|
0, 0,
|
|
|
|
pkey_rsa_ctrl,
|
|
pkey_rsa_ctrl_str
|
|
};
|