}
+/* Customised RSA item verification routine. This is called
+ * when a signature is encountered requiring special handling. We
+ * currently only handle PSS.
+ */
+
+
+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;
+
+ /* 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;
+ }
+
+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;
+ 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;
+ }
const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[] =
{
int_rsa_free,
rsa_pkey_ctrl,
old_rsa_priv_decode,
- old_rsa_priv_encode
+ old_rsa_priv_encode,
+ rsa_item_verify,
+ rsa_item_sign
},
{
projects / openssl.git / blobdiff