/* rsa_ctx_to_pss converts EVP_PKEY_CTX in PSS mode into corresponding
* algorithm parameter, suitable for setting as an AlgorithmIdentifier. */
static ASN1_STRING *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx) {
const EVP_MD *sigmd, *mgf1md;
RSA_PSS_PARAMS *pss = NULL;
ASN1_STRING *os = NULL;
EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
int saltlen, rv = 0;
if (!EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) ||
!EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) ||
!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen)) {
goto err;
}
if (saltlen == -1) {
saltlen = EVP_MD_size(sigmd);
} else if (saltlen == -2) {
saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0) {
saltlen--;
}
} else {
goto err;
}
pss = RSA_PSS_PARAMS_new();
if (!pss) {
goto err;
}
if (saltlen != 20) {
pss->saltLength = ASN1_INTEGER_new();
if (!pss->saltLength ||
!ASN1_INTEGER_set(pss->saltLength, saltlen)) {
goto err;
}
}
if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd) ||
!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md)) {
goto err;
}
/* Finally create string with pss parameter encoding. */
if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os)) {
goto err;
}
rv = 1;
err:
if (pss) {
RSA_PSS_PARAMS_free(pss);
}
if (rv) {
return os;
}
if (os) {
ASN1_STRING_free(os);
}
return NULL;
}
static int rsa_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *sigalg,
const ASN1_STRING *sig)
{
int rv = 0;
int mdnid, saltlen;
uint32_t flags;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_PSS_PARAMS *pss;
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS)
return 0;
/* Decode PSS parameters */
pss = rsa_pss_decode(sigalg);
if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen))
goto err;
mdnid = EVP_MD_type(md);
/*
* For TLS need SHA256, SHA384 or SHA512, digest and MGF1 digest must
* match and salt length must equal digest size
*/
if ((mdnid == NID_sha256 || mdnid == NID_sha384 || mdnid == NID_sha512)
&& mdnid == EVP_MD_type(mgf1md) && saltlen == EVP_MD_size(md))
flags = X509_SIG_INFO_TLS;
else
flags = 0;
/* Note: security bits half number of digest bits */
X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, EVP_MD_size(md) * 4,
flags);
rv = 1;
err:
RSA_PSS_PARAMS_free(pss);
return rv;
}
RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd,
const EVP_MD *mgf1md, int saltlen)
{
RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new();
if (pss == NULL)
goto err;
if (saltlen != 20) {
pss->saltLength = ASN1_INTEGER_new();
if (pss->saltLength == NULL)
goto err;
if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
goto err;
}
if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
goto err;
if (mgf1md == NULL)
mgf1md = sigmd;
if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
goto err;
if (!rsa_md_to_algor(&pss->maskHash, mgf1md))
goto err;
return pss;
err:
RSA_PSS_PARAMS_free(pss);
return NULL;
}
int x509_rsa_ctx_to_pss(EVP_MD_CTX *ctx, X509_ALGOR *algor) {
const EVP_MD *sigmd, *mgf1md;
int saltlen;
if (!EVP_PKEY_CTX_get_signature_md(ctx->pctx, &sigmd) ||
!EVP_PKEY_CTX_get_rsa_mgf1_md(ctx->pctx, &mgf1md) ||
!EVP_PKEY_CTX_get_rsa_pss_saltlen(ctx->pctx, &saltlen)) {
return 0;
}
EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(ctx->pctx);
if (saltlen == -1) {
saltlen = EVP_MD_size(sigmd);
} else if (saltlen == -2) {
saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0) {
saltlen--;
}
} else {
return 0;
}
int ret = 0;
ASN1_STRING *os = NULL;
RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new();
if (!pss) {
goto err;
}
if (saltlen != 20) {
pss->saltLength = ASN1_INTEGER_new();
if (!pss->saltLength ||
!ASN1_INTEGER_set(pss->saltLength, saltlen)) {
goto err;
}
}
if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd) ||
!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md)) {
goto err;
}
/* Finally create string with pss parameter encoding. */
if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os)) {
goto err;
}
X509_ALGOR_set0(algor, OBJ_nid2obj(NID_rsassaPss), V_ASN1_SEQUENCE, os);
os = NULL;
ret = 1;
err:
RSA_PSS_PARAMS_free(pss);
ASN1_STRING_free(os);
return ret;
}
static ASN1_STRING *rsa_ctx_to_pss_string(EVP_PKEY_CTX *pkctx)
{
RSA_PSS_PARAMS *pss = rsa_ctx_to_pss(pkctx);
ASN1_STRING *os;
if (pss == NULL)
return NULL;
os = ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), NULL);
RSA_PSS_PARAMS_free(pss);
return os;
}
int x509_rsa_pss_to_ctx(EVP_MD_CTX *ctx, X509_ALGOR *sigalg, EVP_PKEY *pkey) {
assert(OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss);
/* Decode PSS parameters */
int ret = 0;
X509_ALGOR *maskHash;
RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg, &maskHash);
if (pss == NULL) {
OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PSS_PARAMETERS);
goto err;
}
const EVP_MD *mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash);
const EVP_MD *md = rsa_algor_to_md(pss->hashAlgorithm);
if (mgf1md == NULL || md == NULL) {
goto err;
}
int saltlen = 20;
if (pss->saltLength != NULL) {
saltlen = ASN1_INTEGER_get(pss->saltLength);
/* Could perform more salt length sanity checks but the main
* RSA routines will trap other invalid values anyway. */
if (saltlen < 0) {
OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PSS_PARAMETERS);
goto err;
}
}
/* low-level routines support only trailer field 0xbc (value 1)
* and PKCS#1 says we should reject any other value anyway. */
if (pss->trailerField != NULL && ASN1_INTEGER_get(pss->trailerField) != 1) {
OPENSSL_PUT_ERROR(X509, X509_R_INVALID_PSS_PARAMETERS);
goto err;
}
EVP_PKEY_CTX *pctx;
if (!EVP_DigestVerifyInit(ctx, &pctx, md, NULL, pkey) ||
!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) ||
!EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, saltlen) ||
!EVP_PKEY_CTX_set_rsa_mgf1_md(pctx, mgf1md)) {
goto err;
}
ret = 1;
err:
RSA_PSS_PARAMS_free(pss);
X509_ALGOR_free(maskHash);
return ret;
}
static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
X509_ALGOR *sigalg, EVP_PKEY *pkey)
{
int rv = -1;
int saltlen;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_PSS_PARAMS *pss;
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
return -1;
}
/* Decode PSS parameters */
pss = rsa_pss_decode(sigalg);
if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
goto err;
}
/* We have all parameters now set up context */
if (pkey) {
if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
goto err;
} else {
const EVP_MD *checkmd;
if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
goto err;
if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
goto err;
}
}
if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
goto err;
/* Carry on */
rv = 1;
err:
RSA_PSS_PARAMS_free(pss);
return rv;
}
static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
{
if (OBJ_obj2nid(sigalg->algorithm) == EVP_PKEY_RSA_PSS) {
int rv;
RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg);
rv = rsa_pss_param_print(bp, 0, pss, indent);
RSA_PSS_PARAMS_free(pss);
if (!rv)
return 0;
} else if (!sig && BIO_puts(bp, "\n") <= 0) {
return 0;
}
if (sig)
return X509_signature_dump(bp, sig, indent);
return 1;
}
static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
{
if (OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss) {
int rv;
RSA_PSS_PARAMS *pss;
X509_ALGOR *maskHash;
pss = rsa_pss_decode(sigalg, &maskHash);
rv = rsa_pss_param_print(bp, pss, maskHash, indent);
RSA_PSS_PARAMS_free(pss);
X509_ALGOR_free(maskHash);
if (!rv)
return 0;
} else if (!sig && BIO_puts(bp, "\n") <= 0)
return 0;
if (sig)
return X509_signature_dump(bp, sig, indent);
return 1;
}
static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg)
{
RSA_PSS_PARAMS *pss;
pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
alg->parameter);
if (pss == NULL)
return NULL;
if (pss->maskGenAlgorithm != NULL) {
pss->maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
if (pss->maskHash == NULL) {
RSA_PSS_PARAMS_free(pss);
return NULL;
}
}
return pss;
}
void RSA_free(RSA *r)
{
int i;
if (r == NULL)
return;
CRYPTO_DOWN_REF(&r->references, &i, r->lock);
REF_PRINT_COUNT("RSA", r);
if (i > 0)
return;
REF_ASSERT_ISNT(i < 0);
if (r->meth->finish)
r->meth->finish(r);
#ifndef OPENSSL_NO_ENGINE
ENGINE_finish(r->engine);
#endif
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
CRYPTO_THREAD_lock_free(r->lock);
BN_clear_free(r->n);
BN_clear_free(r->e);
BN_clear_free(r->d);
BN_clear_free(r->p);
BN_clear_free(r->q);
BN_clear_free(r->dmp1);
BN_clear_free(r->dmq1);
BN_clear_free(r->iqmp);
RSA_PSS_PARAMS_free(r->pss);
sk_RSA_PRIME_INFO_pop_free(r->prime_infos, rsa_multip_info_free);
BN_BLINDING_free(r->blinding);
BN_BLINDING_free(r->mt_blinding);
OPENSSL_free(r->bignum_data);
OPENSSL_free(r);
}
int x509_print_rsa_pss_params(BIO *bp, const X509_ALGOR *sigalg, int indent,
ASN1_PCTX *pctx) {
assert(OBJ_obj2nid(sigalg->algorithm) == NID_rsassaPss);
int rv = 0;
X509_ALGOR *maskHash;
RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg, &maskHash);
if (!pss) {
if (BIO_puts(bp, " (INVALID PSS PARAMETERS)\n") <= 0) {
goto err;
}
rv = 1;
goto err;
}
if (BIO_puts(bp, "\n") <= 0 ||
!BIO_indent(bp, indent, 128) ||
BIO_puts(bp, "Hash Algorithm: ") <= 0) {
goto err;
}
if (pss->hashAlgorithm) {
if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0) {
goto err;
}
} else if (BIO_puts(bp, "sha1 (default)") <= 0) {
goto err;
}
if (BIO_puts(bp, "\n") <= 0 ||
!BIO_indent(bp, indent, 128) ||
BIO_puts(bp, "Mask Algorithm: ") <= 0) {
goto err;
}
if (pss->maskGenAlgorithm) {
if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0 ||
BIO_puts(bp, " with ") <= 0) {
goto err;
}
if (maskHash) {
if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0) {
goto err;
}
} else if (BIO_puts(bp, "INVALID") <= 0) {
goto err;
}
} else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) {
goto err;
}
BIO_puts(bp, "\n");
if (!BIO_indent(bp, indent, 128) ||
BIO_puts(bp, "Salt Length: 0x") <= 0) {
goto err;
}
if (pss->saltLength) {
if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0) {
goto err;
}
} else if (BIO_puts(bp, "14 (default)") <= 0) {
goto err;
}
BIO_puts(bp, "\n");
if (!BIO_indent(bp, indent, 128) ||
BIO_puts(bp, "Trailer Field: 0x") <= 0) {
goto err;
}
if (pss->trailerField) {
if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0) {
goto err;
}
} else if (BIO_puts(bp, "BC (default)") <= 0) {
goto err;
}
BIO_puts(bp, "\n");
rv = 1;
err:
RSA_PSS_PARAMS_free(pss);
X509_ALGOR_free(maskHash);
return rv;
}
static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
X509_ALGOR *sigalg, EVP_PKEY *pkey)
{
int rv = -1;
int saltlen;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_PSS_PARAMS *pss;
X509_ALGOR *maskHash;
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
return -1;
}
/* Decode PSS parameters */
pss = rsa_pss_decode(sigalg, &maskHash);
if (pss == NULL) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
goto err;
}
mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash);
if (!mgf1md)
goto err;
md = rsa_algor_to_md(pss->hashAlgorithm);
if (!md)
goto err;
if (pss->saltLength) {
saltlen = ASN1_INTEGER_get(pss->saltLength);
/*
* Could perform more salt length sanity checks but the main RSA
* routines will trap other invalid values anyway.
*/
if (saltlen < 0) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_SALT_LENGTH);
goto err;
}
} else
saltlen = 20;
/*
* low-level routines support only trailer field 0xbc (value 1) and
* PKCS#1 says we should reject any other value anyway.
*/
if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_TRAILER);
goto err;
}
/* We have all parameters now set up context */
if (pkey) {
if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
goto err;
} else {
const EVP_MD *checkmd;
if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
goto err;
if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
goto err;
}
}
if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
goto err;
/* Carry on */
rv = 1;
err:
RSA_PSS_PARAMS_free(pss);
X509_ALGOR_free(maskHash);
return rv;
}
static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
X509_ALGOR *alg1, X509_ALGOR *alg2,
ASN1_BIT_STRING *sig)
{
int pad_mode;
EVP_PKEY_CTX *pkctx = ctx->pctx;
if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
return 0;
if (pad_mode == RSA_PKCS1_PADDING)
return 2;
if (pad_mode == RSA_PKCS1_PSS_PADDING)
{
const EVP_MD *sigmd, *mgf1md;
RSA_PSS_PARAMS *pss = NULL;
X509_ALGOR *mgf1alg = NULL;
ASN1_STRING *os1 = NULL, *os2 = NULL;
EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
int saltlen, rv = 0;
sigmd = EVP_MD_CTX_md(ctx);
if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
goto err;
if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
goto err;
if (saltlen == -1)
saltlen = EVP_MD_size(sigmd);
else if (saltlen == -2)
{
saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
if (((EVP_PKEY_bits(pk) - 1) & 0x7) == 0)
saltlen--;
}
pss = RSA_PSS_PARAMS_new();
if (!pss)
goto err;
if (saltlen != 20)
{
pss->saltLength = ASN1_INTEGER_new();
if (!pss->saltLength)
goto err;
if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
goto err;
}
if (EVP_MD_type(sigmd) != NID_sha1)
{
pss->hashAlgorithm = X509_ALGOR_new();
if (!pss->hashAlgorithm)
goto err;
X509_ALGOR_set_md(pss->hashAlgorithm, sigmd);
}
if (EVP_MD_type(mgf1md) != NID_sha1)
{
ASN1_STRING *stmp = NULL;
/* need to embed algorithm ID inside another */
mgf1alg = X509_ALGOR_new();
X509_ALGOR_set_md(mgf1alg, mgf1md);
if (!ASN1_item_pack(mgf1alg, ASN1_ITEM_rptr(X509_ALGOR),
&stmp))
goto err;
pss->maskGenAlgorithm = X509_ALGOR_new();
if (!pss->maskGenAlgorithm)
goto err;
X509_ALGOR_set0(pss->maskGenAlgorithm,
OBJ_nid2obj(NID_mgf1),
V_ASN1_SEQUENCE, stmp);
}
/* Finally create string with pss parameter encoding. */
if (!ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), &os1))
goto err;
if (alg2)
{
os2 = ASN1_STRING_dup(os1);
if (!os2)
goto err;
X509_ALGOR_set0(alg2, OBJ_nid2obj(NID_rsassaPss),
V_ASN1_SEQUENCE, os2);
}
X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_rsassaPss),
V_ASN1_SEQUENCE, os1);
os1 = os2 = NULL;
rv = 3;
err:
if (mgf1alg)
X509_ALGOR_free(mgf1alg);
if (pss)
RSA_PSS_PARAMS_free(pss);
if (os1)
ASN1_STRING_free(os1);
return rv;
}
return 2;
}
static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
EVP_PKEY *pkey)
{
int rv = -1;
int saltlen;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_PSS_PARAMS *pss;
X509_ALGOR *maskHash;
EVP_PKEY_CTX *pkctx;
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss)
{
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
return -1;
}
/* Decode PSS parameters */
pss = rsa_pss_decode(sigalg, &maskHash);
if (pss == NULL)
{
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_INVALID_PSS_PARAMETERS);
goto err;
}
/* Check mask and lookup mask hash algorithm */
if (pss->maskGenAlgorithm)
{
if (OBJ_obj2nid(pss->maskGenAlgorithm->algorithm) != NID_mgf1)
{
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_MASK_ALGORITHM);
goto err;
}
if (!maskHash)
{
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_MASK_PARAMETER);
goto err;
}
mgf1md = EVP_get_digestbyobj(maskHash->algorithm);
if (mgf1md == NULL)
{
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNKNOWN_MASK_DIGEST);
goto err;
}
}
else
mgf1md = EVP_sha1();
if (pss->hashAlgorithm)
{
md = EVP_get_digestbyobj(pss->hashAlgorithm->algorithm);
if (md == NULL)
{
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNKNOWN_PSS_DIGEST);
goto err;
}
}
else
md = EVP_sha1();
if (pss->saltLength)
{
saltlen = ASN1_INTEGER_get(pss->saltLength);
/* Could perform more salt length sanity checks but the main
* RSA routines will trap other invalid values anyway.
*/
if (saltlen < 0)
{
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_INVALID_SALT_LENGTH);
goto err;
}
}
else
saltlen = 20;
/* low-level routines support only trailer field 0xbc (value 1)
* and PKCS#1 says we should reject any other value anyway.
*/
if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1)
{
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_INVALID_TRAILER);
goto err;
}
/* We have all parameters now set up context */
if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
goto err;
if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
goto err;
/* Carry on */
rv = 2;
err:
RSA_PSS_PARAMS_free(pss);
if (maskHash)
X509_ALGOR_free(maskHash);
return rv;
}
/* From PSS AlgorithmIdentifier set public key parameters. */
static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, X509_ALGOR *sigalg, EVP_PKEY *pkey) {
int ret = 0;
int saltlen;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_PSS_PARAMS *pss;
X509_ALGOR *maskHash;
EVP_PKEY_CTX *pkctx;
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != NID_rsassaPss) {
OPENSSL_PUT_ERROR(EVP, rsa_pss_to_ctx, EVP_R_UNSUPPORTED_SIGNATURE_TYPE);
return 0;
}
/* Decode PSS parameters */
pss = rsa_pss_decode(sigalg, &maskHash);
if (pss == NULL) {
OPENSSL_PUT_ERROR(EVP, rsa_pss_to_ctx, EVP_R_INVALID_PSS_PARAMETERS);
goto err;
}
mgf1md = rsa_mgf1_to_md(pss->maskGenAlgorithm, maskHash);
if (!mgf1md) {
goto err;
}
md = rsa_algor_to_md(pss->hashAlgorithm);
if (!md) {
goto err;
}
saltlen = 20;
if (pss->saltLength) {
saltlen = ASN1_INTEGER_get(pss->saltLength);
/* Could perform more salt length sanity checks but the main
* RSA routines will trap other invalid values anyway. */
if (saltlen < 0) {
OPENSSL_PUT_ERROR(EVP, rsa_pss_to_ctx, EVP_R_INVALID_SALT_LENGTH);
goto err;
}
}
/* low-level routines support only trailer field 0xbc (value 1)
* and PKCS#1 says we should reject any other value anyway. */
if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
OPENSSL_PUT_ERROR(EVP, rsa_pss_to_ctx, EVP_R_INVALID_TRAILER);
goto err;
}
if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey) ||
!EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) ||
!EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) ||
!EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md)) {
goto err;
}
ret = 1;
err:
RSA_PSS_PARAMS_free(pss);
if (maskHash) {
X509_ALGOR_free(maskHash);
}
return ret;
}
