Allow public key ASN1 methods to set PKCS#7 SignerInfo structures.

1 files changed, 31 insertions, 44 deletions

diff --git a/crypto/pkcs7/pk7_lib.c b/crypto/pkcs7/pk7_lib.c
index 58ce6791c9..649cdbf279 100644
--- a/crypto/pkcs7/pk7_lib.c
+++ b/crypto/pkcs7/pk7_lib.c
@@ -60,6 +60,7 @@
 #include "cryptlib.h"
 #include <openssl/objects.h>
 #include <openssl/x509.h>
+#include "asn1_locl.h"
 
 long PKCS7_ctrl(PKCS7 *p7, int cmd, long larg, char *parg)
 	{
@@ -340,13 +341,8 @@ int PKCS7_add_crl(PKCS7 *p7, X509_CRL *crl)
 int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
 	     const EVP_MD *dgst)
 	{
-	int nid;
-	char is_dsa;
+	int ret;
 
-	if (pkey->type == EVP_PKEY_DSA || pkey->type == EVP_PKEY_EC)
-		is_dsa = 1;
-	else
-		is_dsa = 0;
 	/* We now need to add another PKCS7_SIGNER_INFO entry */
 	if (!ASN1_INTEGER_set(p7i->version,1))
 		goto err;
@@ -366,50 +362,28 @@ int PKCS7_SIGNER_INFO_set(PKCS7_SIGNER_INFO *p7i, X509 *x509, EVP_PKEY *pkey,
 	p7i->pkey=pkey;
 
 	/* Set the algorithms */
-	if (is_dsa) p7i->digest_alg->algorithm=OBJ_nid2obj(NID_sha1);
-	else	
-		p7i->digest_alg->algorithm=OBJ_nid2obj(EVP_MD_type(dgst));
 
-	if (p7i->digest_alg->parameter != NULL)
-		ASN1_TYPE_free(p7i->digest_alg->parameter);
-	if ((p7i->digest_alg->parameter=ASN1_TYPE_new()) == NULL)
-		goto err;
-	p7i->digest_alg->parameter->type=V_ASN1_NULL;
+	X509_ALGOR_set0(p7i->digest_alg, OBJ_nid2obj(EVP_MD_type(dgst)),
+				V_ASN1_NULL, NULL);
 
 	if (p7i->digest_enc_alg->parameter != NULL)
 		ASN1_TYPE_free(p7i->digest_enc_alg->parameter);
-	nid = EVP_PKEY_type(pkey->type);
-	if (nid == EVP_PKEY_RSA)
-		{
-		p7i->digest_enc_alg->algorithm=OBJ_nid2obj(NID_rsaEncryption);
-		if (!(p7i->digest_enc_alg->parameter=ASN1_TYPE_new()))
-			goto err;
-		p7i->digest_enc_alg->parameter->type=V_ASN1_NULL;
-		}
-	else if (nid == EVP_PKEY_DSA)
-		{
-#if 1
-		/* use 'dsaEncryption' OID for compatibility with other software
-		 * (PKCS #7 v1.5 does specify how to handle DSA) ... */
-		p7i->digest_enc_alg->algorithm=OBJ_nid2obj(NID_dsa);
-#else
-		/* ... although the 'dsaWithSHA1' OID (as required by RFC 2630 for CMS)
-		 * would make more sense. */
-		p7i->digest_enc_alg->algorithm=OBJ_nid2obj(NID_dsaWithSHA1);
-#endif
-		p7i->digest_enc_alg->parameter = NULL; /* special case for DSA: omit 'parameter'! */
-		}
-	else if (nid == EVP_PKEY_EC)
+	if (pkey->ameth && pkey->ameth->pkey_ctrl)
 		{
-		p7i->digest_enc_alg->algorithm=OBJ_nid2obj(NID_ecdsa_with_SHA1);
-		if (!(p7i->digest_enc_alg->parameter=ASN1_TYPE_new()))
-			goto err;
-		p7i->digest_enc_alg->parameter->type=V_ASN1_NULL;
+		ret = pkey->ameth->pkey_ctrl(pkey, ASN1_PKEY_CTRL_PKCS7_SIGN,
+						0, p7i);
+		if (ret > 0)
+			return 1;
+		if (ret != -2)
+			{
+			PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
+					PKCS7_R_SIGNING_CTRL_FAILURE);
+			return 0;
+			}
 		}
-	else
-		return(0);
-
-	return(1);
+	PKCS7err(PKCS7_F_PKCS7_SIGNER_INFO_SET,
+			PKCS7_R_SIGNING_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
+	return 0;
 err:
 	return(0);
 	}
@@ -424,6 +398,8 @@ PKCS7_SIGNER_INFO *PKCS7_add_signature(PKCS7 *p7, X509 *x509, EVP_PKEY *pkey,
 	if (!PKCS7_add_signer(p7,si)) goto err;
 	return(si);
 err:
+	if (si)
+		PKCS7_SIGNER_INFO_free(si);
 	return(NULL);
 	}
 
@@ -459,6 +435,17 @@ STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
 		return(NULL);
 	}
 
+void PKCS7_SIGNER_INFO_get0_algs(PKCS7_SIGNER_INFO *si, EVP_PKEY **pk,
+					X509_ALGOR **pdig, X509_ALGOR **psig)
+	{
+	if (pk)
+		*pk = si->pkey;
+	if (pdig)
+		*pdig = si->digest_alg;
+	if (psig)
+		*psig = si->digest_enc_alg;
+	}
+
 PKCS7_RECIP_INFO *PKCS7_add_recipient(PKCS7 *p7, X509 *x509)
 	{
 	PKCS7_RECIP_INFO *ri;