int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd,
const EVP_MD **pmgf1md, int *psaltlen)
{
if (pss == NULL)
return 0;
*pmd = rsa_algor_to_md(pss->hashAlgorithm);
if (*pmd == NULL)
return 0;
*pmgf1md = rsa_algor_to_md(pss->maskHash);
if (*pmgf1md == NULL)
return 0;
if (pss->saltLength) {
*psaltlen = ASN1_INTEGER_get(pss->saltLength);
if (*psaltlen < 0) {
RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_SALT_LENGTH);
return 0;
}
} else {
*psaltlen = 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_GET_PARAM, RSA_R_INVALID_TRAILER);
return 0;
}
return 1;
}
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_cms_decrypt(CMS_RecipientInfo *ri)
{
EVP_PKEY_CTX *pkctx;
X509_ALGOR *cmsalg;
int nid;
int rv = -1;
unsigned char *label = NULL;
int labellen = 0;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_OAEP_PARAMS *oaep;
X509_ALGOR *maskHash;
pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (!pkctx)
return 0;
if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
return -1;
nid = OBJ_obj2nid(cmsalg->algorithm);
if (nid == NID_rsaEncryption)
return 1;
if (nid != NID_rsaesOaep) {
RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
return -1;
}
/* Decode OAEP parameters */
oaep = rsa_oaep_decode(cmsalg, &maskHash);
if (oaep == NULL) {
RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
goto err;
}
mgf1md = rsa_mgf1_to_md(oaep->maskGenFunc, maskHash);
if (!mgf1md)
goto err;
md = rsa_algor_to_md(oaep->hashFunc);
if (!md)
goto err;
if (oaep->pSourceFunc) {
X509_ALGOR *plab = oaep->pSourceFunc;
if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
goto err;
}
if (plab->parameter->type != V_ASN1_OCTET_STRING) {
RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
goto err;
}
label = plab->parameter->value.octet_string->data;
/* Stop label being freed when OAEP parameters are freed */
plab->parameter->value.octet_string->data = NULL;
labellen = plab->parameter->value.octet_string->length;
}
if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
goto err;
if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
goto err;
/* Carry on */
rv = 1;
err:
RSA_OAEP_PARAMS_free(oaep);
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;
}
/* 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;
}