/* Set PSS parameters when generating a key, if necessary */
static int rsa_set_pss_param(RSA *rsa, EVP_PKEY_CTX *ctx)
{
RSA_PKEY_CTX *rctx = ctx->data;
if (!pkey_ctx_is_pss(ctx))
return 1;
/* If all parameters are default values don't set pss */
if (rctx->md == NULL && rctx->mgf1md == NULL && rctx->saltlen == -2)
return 1;
rsa->pss = rsa_pss_params_create(rctx->md, rctx->mgf1md,
rctx->saltlen == -2 ? 0 : rctx->saltlen);
if (rsa->pss == NULL)
return 0;
return 1;
}
static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
{
RSA_PKEY_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
if (rctx == NULL)
return 0;
rctx->nbits = 1024;
if (pkey_ctx_is_pss(ctx))
rctx->pad_mode = RSA_PKCS1_PSS_PADDING;
else
rctx->pad_mode = RSA_PKCS1_PADDING;
/* Maximum for sign, auto for verify */
rctx->saltlen = RSA_PSS_SALTLEN_AUTO;
rctx->min_saltlen = -1;
ctx->data = rctx;
ctx->keygen_info = rctx->gentmp;
ctx->keygen_info_count = 2;
return 1;
}
static int pkey_pss_init(EVP_PKEY_CTX *ctx)
{
RSA *rsa;
RSA_PKEY_CTX *rctx = ctx->data;
const EVP_MD *md;
const EVP_MD *mgf1md;
int min_saltlen, max_saltlen;
/* Should never happen */
if (!pkey_ctx_is_pss(ctx))
return 0;
rsa = ctx->pkey->pkey.rsa;
/* If no restrictions just return */
if (rsa->pss == NULL)
return 1;
/* Get and check parameters */
if (!rsa_pss_get_param(rsa->pss, &md, &mgf1md, &min_saltlen))
return 0;
/* See if minumum salt length exceeds maximum possible */
max_saltlen = RSA_size(rsa) - EVP_MD_size(md);
if ((RSA_bits(rsa) & 0x7) == 1)
max_saltlen--;
if (min_saltlen > max_saltlen) {
RSAerr(RSA_F_PKEY_PSS_INIT, RSA_R_INVALID_SALT_LENGTH);
return 0;
}
rctx->min_saltlen = min_saltlen;
/*
* Set PSS restrictions as defaults: we can then block any attempt to
* use invalid values in pkey_rsa_ctrl
*/
rctx->md = md;
rctx->mgf1md = mgf1md;
rctx->saltlen = min_saltlen;
return 1;
}
static int rsa_cms_verify(CMS_SignerInfo *si)
{
int nid, nid2;
X509_ALGOR *alg;
EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
nid = OBJ_obj2nid(alg->algorithm);
if (nid == EVP_PKEY_RSA_PSS)
return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
/* Only PSS allowed for PSS keys */
if (pkey_ctx_is_pss(pkctx)) {
RSAerr(RSA_F_RSA_CMS_VERIFY, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
return 0;
}
if (nid == NID_rsaEncryption)
return 1;
/* Workaround for some implementation that use a signature OID */
if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
if (nid2 == NID_rsaEncryption)
return 1;
}
return 0;
}
static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (value == NULL) {
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;
if (!strcmp(value, "digest"))
saltlen = RSA_PSS_SALTLEN_DIGEST;
else if (!strcmp(value, "max"))
saltlen = RSA_PSS_SALTLEN_MAX;
else if (!strcmp(value, "auto"))
saltlen = RSA_PSS_SALTLEN_AUTO;
else
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)
return EVP_PKEY_CTX_md(ctx,
EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_RSA_MGF1_MD, value);
if (pkey_ctx_is_pss(ctx)) {
if (strcmp(type, "rsa_pss_keygen_mgf1_md") == 0)
return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
EVP_PKEY_CTRL_RSA_MGF1_MD, value);
if (strcmp(type, "rsa_pss_keygen_md") == 0)
return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_KEYGEN,
EVP_PKEY_CTRL_MD, value);
if (strcmp(type, "rsa_pss_keygen_saltlen") == 0) {
int saltlen = atoi(value);
return EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(ctx, saltlen);
}
}
if (strcmp(type, "rsa_oaep_md") == 0)
return EVP_PKEY_CTX_md(ctx, EVP_PKEY_OP_TYPE_CRYPT,
EVP_PKEY_CTRL_RSA_OAEP_MD, value);
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_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
RSA_PKEY_CTX *rctx = ctx->data;
switch (type) {
case EVP_PKEY_CTRL_RSA_PADDING:
if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING)) {
if (!check_padding_md(rctx->md, p1))
return 0;
if (p1 == RSA_PKCS1_PSS_PADDING) {
if (!(ctx->operation &
(EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
goto bad_pad;
if (!rctx->md)
rctx->md = EVP_sha1();
} else if (pkey_ctx_is_pss(ctx)) {
goto bad_pad;
}
if (p1 == RSA_PKCS1_OAEP_PADDING) {
if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
goto bad_pad;
if (!rctx->md)
rctx->md = EVP_sha1();
}
rctx->pad_mode = p1;
return 1;
}
bad_pad:
RSAerr(RSA_F_PKEY_RSA_CTRL,
RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
return -2;
case EVP_PKEY_CTRL_GET_RSA_PADDING:
*(int *)p2 = rctx->pad_mode;
return 1;
case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
case EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN:
if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
return -2;
}
if (type == EVP_PKEY_CTRL_GET_RSA_PSS_SALTLEN) {
*(int *)p2 = rctx->saltlen;
} else {
if (p1 < RSA_PSS_SALTLEN_MAX)
return -2;
if (rsa_pss_restricted(rctx)) {
if (p1 == RSA_PSS_SALTLEN_AUTO
&& ctx->operation == EVP_PKEY_OP_VERIFY) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
return -2;
}
if ((p1 == RSA_PSS_SALTLEN_DIGEST
&& rctx->min_saltlen > EVP_MD_size(rctx->md))
|| (p1 >= 0 && p1 < rctx->min_saltlen)) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_PSS_SALTLEN_TOO_SMALL);
return 0;
}
}
rctx->saltlen = p1;
}
return 1;
case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
if (p1 < 512) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_KEY_SIZE_TOO_SMALL);
return -2;
}
rctx->nbits = p1;
return 1;
case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
if (p2 == NULL || !BN_is_odd((BIGNUM *)p2) || BN_is_one((BIGNUM *)p2)) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_BAD_E_VALUE);
return -2;
}
BN_free(rctx->pub_exp);
rctx->pub_exp = p2;
return 1;
case EVP_PKEY_CTRL_RSA_OAEP_MD:
case EVP_PKEY_CTRL_GET_RSA_OAEP_MD:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
return -2;
}
if (type == EVP_PKEY_CTRL_GET_RSA_OAEP_MD)
*(const EVP_MD **)p2 = rctx->md;
else
rctx->md = p2;
return 1;
case EVP_PKEY_CTRL_MD:
if (!check_padding_md(p2, rctx->pad_mode))
return 0;
if (rsa_pss_restricted(rctx)) {
if (EVP_MD_type(rctx->md) == EVP_MD_type(p2))
return 1;
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_DIGEST_NOT_ALLOWED);
return 0;
}
rctx->md = p2;
return 1;
case EVP_PKEY_CTRL_GET_MD:
*(const EVP_MD **)p2 = rctx->md;
return 1;
case EVP_PKEY_CTRL_RSA_MGF1_MD:
case EVP_PKEY_CTRL_GET_RSA_MGF1_MD:
if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING
&& rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_MGF1_MD);
return -2;
}
if (type == EVP_PKEY_CTRL_GET_RSA_MGF1_MD) {
if (rctx->mgf1md)
*(const EVP_MD **)p2 = rctx->mgf1md;
else
*(const EVP_MD **)p2 = rctx->md;
} else {
if (rsa_pss_restricted(rctx)) {
if (EVP_MD_type(rctx->mgf1md) == EVP_MD_type(p2))
return 1;
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_MGF1_DIGEST_NOT_ALLOWED);
return 0;
}
rctx->mgf1md = p2;
}
return 1;
case EVP_PKEY_CTRL_RSA_OAEP_LABEL:
if (rctx->pad_mode != RSA_PKCS1_OAEP_PADDING) {
RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PADDING_MODE);
return -2;
}
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_SIGN:
#ifndef OPENSSL_NO_CMS
case EVP_PKEY_CTRL_CMS_SIGN:
#endif
return 1;
case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
case EVP_PKEY_CTRL_PKCS7_DECRYPT:
#ifndef OPENSSL_NO_CMS
case EVP_PKEY_CTRL_CMS_DECRYPT:
case EVP_PKEY_CTRL_CMS_ENCRYPT:
#endif
if (!pkey_ctx_is_pss(ctx))
return 1;
/* fall through */
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;
}
}
