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openssl/crypto/asn1/a_sign.c
Richard Levitte d5aef5946b Adapt ASN1_item_sign_ctx() for use with provided keypairs 
The mechanism to do this is to ask the signature operation for the DER
encoded AlgorithmIdentifier that corresponds to the combination of
signature algorithm and digest algorithm.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/10920)
2020-01-28 08:06:01 +01:00

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/*
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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 <stdio.h>
#include <time.h>
#include <sys/types.h>
#include "internal/cryptlib.h"
#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/objects.h>
#include <openssl/buffer.h>
#include <openssl/core_names.h>
#include "crypto/asn1.h"
#include "crypto/evp.h"
#ifndef NO_ASN1_OLD
int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
const EVP_MD *type)
{
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
unsigned char *p, *buf_in = NULL, *buf_out = NULL;
int i, inl = 0, outl = 0;
size_t inll = 0, outll = 0;
X509_ALGOR *a;
if (ctx == NULL) {
ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
goto err;
}
for (i = 0; i < 2; i++) {
if (i == 0)
a = algor1;
else
a = algor2;
if (a == NULL)
continue;
if (type->pkey_type == NID_dsaWithSHA1) {
/*
* special case: RFC 2459 tells us to omit 'parameters' with
* id-dsa-with-sha1
*/
ASN1_TYPE_free(a->parameter);
a->parameter = NULL;
} else if ((a->parameter == NULL) ||
(a->parameter->type != V_ASN1_NULL)) {
ASN1_TYPE_free(a->parameter);
if ((a->parameter = ASN1_TYPE_new()) == NULL)
goto err;
a->parameter->type = V_ASN1_NULL;
}
ASN1_OBJECT_free(a->algorithm);
a->algorithm = OBJ_nid2obj(type->pkey_type);
if (a->algorithm == NULL) {
ASN1err(ASN1_F_ASN1_SIGN, ASN1_R_UNKNOWN_OBJECT_TYPE);
goto err;
}
if (a->algorithm->length == 0) {
ASN1err(ASN1_F_ASN1_SIGN,
ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
goto err;
}
}
inl = i2d(data, NULL);
if (inl <= 0) {
ASN1err(ASN1_F_ASN1_SIGN, ERR_R_INTERNAL_ERROR);
goto err;
}
inll = (size_t)inl;
buf_in = OPENSSL_malloc(inll);
outll = outl = EVP_PKEY_size(pkey);
buf_out = OPENSSL_malloc(outll);
if (buf_in == NULL || buf_out == NULL) {
outl = 0;
ASN1err(ASN1_F_ASN1_SIGN, ERR_R_MALLOC_FAILURE);
goto err;
}
p = buf_in;
i2d(data, &p);
if (!EVP_SignInit_ex(ctx, type, NULL)
|| !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
|| !EVP_SignFinal(ctx, (unsigned char *)buf_out,
(unsigned int *)&outl, pkey)) {
outl = 0;
ASN1err(ASN1_F_ASN1_SIGN, ERR_R_EVP_LIB);
goto err;
}
OPENSSL_free(signature->data);
signature->data = buf_out;
buf_out = NULL;
signature->length = outl;
/*
* In the interests of compatibility, I'll make sure that the bit string
* has a 'not-used bits' value of 0
*/
signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
err:
EVP_MD_CTX_free(ctx);
OPENSSL_clear_free((char *)buf_in, inll);
OPENSSL_clear_free((char *)buf_out, outll);
return outl;
}
#endif
int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1,
X509_ALGOR *algor2, ASN1_BIT_STRING *signature, void *asn,
EVP_PKEY *pkey, const EVP_MD *type)
{
int rv;
EVP_MD_CTX *ctx = EVP_MD_CTX_new();
if (ctx == NULL) {
ASN1err(ASN1_F_ASN1_ITEM_SIGN, ERR_R_MALLOC_FAILURE);
return 0;
}
if (!EVP_DigestSignInit(ctx, NULL, type, NULL, pkey)) {
EVP_MD_CTX_free(ctx);
return 0;
}
rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, asn, ctx);
EVP_MD_CTX_free(ctx);
return rv;
}
int ASN1_item_sign_ctx(const ASN1_ITEM *it,
X509_ALGOR *algor1, X509_ALGOR *algor2,
ASN1_BIT_STRING *signature, void *asn, EVP_MD_CTX *ctx)
{
const EVP_MD *type;
EVP_PKEY *pkey;
unsigned char *buf_in = NULL, *buf_out = NULL;
size_t inl = 0, outl = 0, outll = 0;
int signid, paramtype, buf_len = 0;
int rv, pkey_id;
type = EVP_MD_CTX_md(ctx);
pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_pkey_ctx(ctx));
if (pkey == NULL) {
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
goto err;
}
if (pkey->ameth == NULL) {
EVP_PKEY_CTX *pctx = EVP_MD_CTX_pkey_ctx(ctx);
OSSL_PARAM params[2];
unsigned char aid[128];
size_t aid_len = 0;
if (pctx == NULL
|| !EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
goto err;
}
params[0] =
OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID,
aid, sizeof(aid));
params[1] = OSSL_PARAM_construct_end();
if (EVP_PKEY_CTX_get_params(pctx, params) <= 0)
goto err;
if ((aid_len = params[0].return_size) == 0) {
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
goto err;
}
if (algor1 != NULL) {
const unsigned char *pp = aid;
if (d2i_X509_ALGOR(&algor1, &pp, aid_len) == NULL) {
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_INTERNAL_ERROR);
goto err;
}
}
if (algor2 != NULL) {
const unsigned char *pp = aid;
if (d2i_X509_ALGOR(&algor2, &pp, aid_len) == NULL) {
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_INTERNAL_ERROR);
goto err;
}
}
rv = 3;
} else if (pkey->ameth->item_sign) {
rv = pkey->ameth->item_sign(ctx, it, asn, algor1, algor2, signature);
if (rv == 1)
outl = signature->length;
/*-
* Return value meanings:
* <=0: error.
* 1: method does everything.
* 2: carry on as normal.
* 3: ASN1 method sets algorithm identifiers: just sign.
*/
if (rv <= 0)
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
if (rv <= 1)
goto err;
} else {
rv = 2;
}
if (rv == 2) {
if (type == NULL) {
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ASN1_R_CONTEXT_NOT_INITIALISED);
goto err;
}
pkey_id =
#ifndef OPENSSL_NO_SM2
EVP_PKEY_id(pkey) == NID_sm2 ? NID_sm2 :
#endif
pkey->ameth->pkey_id;
if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(type), pkey_id)) {
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX,
ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
goto err;
}
if (pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL)
paramtype = V_ASN1_NULL;
else
paramtype = V_ASN1_UNDEF;
if (algor1)
X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL);
if (algor2)
X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL);
}
buf_len = ASN1_item_i2d(asn, &buf_in, it);
if (buf_len <= 0) {
outl = 0;
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_INTERNAL_ERROR);
goto err;
}
inl = buf_len;
if (!EVP_DigestSign(ctx, NULL, &outll, buf_in, inl)) {
outl = 0;
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
goto err;
}
outl = outll;
buf_out = OPENSSL_malloc(outll);
if (buf_in == NULL || buf_out == NULL) {
outl = 0;
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
outl = 0;
ASN1err(ASN1_F_ASN1_ITEM_SIGN_CTX, ERR_R_EVP_LIB);
goto err;
}
OPENSSL_free(signature->data);
signature->data = buf_out;
buf_out = NULL;
signature->length = outl;
/*
* In the interests of compatibility, I'll make sure that the bit string
* has a 'not-used bits' value of 0
*/
signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
err:
OPENSSL_clear_free((char *)buf_in, inl);
OPENSSL_clear_free((char *)buf_out, outll);
return outl;
}
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