Initial support for enveloped data decrypt. Extent runex.pl to cover these

examples. All RFC4134 examples can not be processed.

9 files changed, 201 insertions, 67 deletions

diff --git a/crypto/cms/cms.h b/crypto/cms/cms.h
index c9801cf293..41f0e8687d 100644
--- a/crypto/cms/cms.h
+++ b/crypto/cms/cms.h
@@ -70,6 +70,7 @@ typedef struct CMS_ContentInfo_st CMS_ContentInfo;
 typedef struct CMS_SignerInfo_st CMS_SignerInfo;
 typedef struct CMS_CertificateChoices CMS_CertificateChoices;
 typedef struct CMS_RevocationInfoChoice_st CMS_RevocationInfoChoice;
+typedef struct CMS_RecipientInfo_st CMS_RecipientInfo;
 
 DECLARE_STACK_OF(CMS_SignerInfo)
 DECLARE_ASN1_FUNCTIONS(CMS_ContentInfo)
@@ -78,6 +79,12 @@ DECLARE_ASN1_PRINT_FUNCTION(CMS_ContentInfo)
 #define CMS_SIGNERINFO_ISSUER_SERIAL	0
 #define CMS_SIGNERINFO_KEYIDENTIFIER	1
 
+#define CMS_RECIPINFO_TRANS		0
+#define CMS_RECIPINFO_AGREE		1
+#define CMS_RECIPINFO_KEK		2
+#define CMS_RECIPINFO_PASS		3
+#define CMS_RECIPINFO_OTHER		4
+
 /* S/MIME related flags */
 
 #define CMS_TEXT			0x1
@@ -157,9 +164,23 @@ STACK_OF(X509) *CMS_get0_signers(CMS_ContentInfo *cms);
 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *in,
 				const EVP_CIPHER *cipher, unsigned int flags);
 
-int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert, BIO *data,
+int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert,
+				BIO *data, BIO *dcont,
 				unsigned int flags);
 
+STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms);
+int CMS_RecipientInfo_type(CMS_RecipientInfo *ri);
+int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert);
+int CMS_RecipientInfo_ktri_get0_algs(CMS_RecipientInfo *ri,
+					EVP_PKEY **pk, X509 **recip,
+					X509_ALGOR **palg);
+int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
+					ASN1_OCTET_STRING **keyid,
+					X509_NAME **issuer, ASN1_INTEGER **sno);
+
+int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
+			       EVP_PKEY *pkey);
+	
 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 							unsigned int flags);
 CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags);
@@ -249,6 +270,7 @@ void ERR_load_CMS_strings(void);
 /* Error codes for the CMS functions. */
 
 /* Function codes. */
+#define CMS_F_CHECK_CONTENT				 151
 #define CMS_F_CMS_ADD1_RECIPIENT_CERT			 99
 #define CMS_F_CMS_ADD1_SIGNER				 100
 #define CMS_F_CMS_ADD1_SIGNINGTIME			 101
@@ -262,6 +284,7 @@ void ERR_load_CMS_strings(void);
 #define CMS_F_CMS_DATA					 107
 #define CMS_F_CMS_DATAFINAL				 108
 #define CMS_F_CMS_DATAINIT				 109
+#define CMS_F_CMS_DECRYPT				 152
 #define CMS_F_CMS_DECRYPTEDCONTENT_DECRYPT_BIO		 145
 #define CMS_F_CMS_DECRYPTEDCONTENT_ENCRYPT_BIO		 143
 #define CMS_F_CMS_DIGESTALGORITHM_FIND_CTX		 110
@@ -285,6 +308,7 @@ void ERR_load_CMS_strings(void);
 #define CMS_F_CMS_GET0_ENVELOPED			 119
 #define CMS_F_CMS_GET0_REVOCATION_CHOICES		 120
 #define CMS_F_CMS_GET0_SIGNED				 121
+#define CMS_F_CMS_RECIPIENTINFO_DECRYPT			 150
 #define CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP		 122
 #define CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS		 123
 #define CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID	 124
@@ -307,6 +331,7 @@ void ERR_load_CMS_strings(void);
 #define CMS_R_CIPHER_INITIALISATION_ERROR		 138
 #define CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR	 139
 #define CMS_R_CMS_DATAFINAL_ERROR			 101
+#define CMS_R_CMS_LIB					 145
 #define CMS_R_CONTENT_NOT_FOUND				 102
 #define CMS_R_CONTENT_TYPE_NOT_COMPRESSED_DATA		 103
 #define CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA		 104
@@ -328,6 +353,7 @@ void ERR_load_CMS_strings(void);
 #define CMS_R_NO_DEFAULT_DIGEST				 117
 #define CMS_R_NO_DIGEST_SET				 118
 #define CMS_R_NO_MATCHING_DIGEST			 119
+#define CMS_R_NO_MATCHING_RECIPIENT			 147
 #define CMS_R_NO_PRIVATE_KEY				 120
 #define CMS_R_NO_PUBLIC_KEY				 121
 #define CMS_R_NO_SIGNERS				 122
@@ -340,6 +366,7 @@ void ERR_load_CMS_strings(void);
 #define CMS_R_TYPE_NOT_DATA				 129
 #define CMS_R_TYPE_NOT_DIGESTED_DATA			 130
 #define CMS_R_TYPE_NOT_ENCRYPTED_DATA			 142
+#define CMS_R_TYPE_NOT_ENVELOPED_DATA			 146
 #define CMS_R_UNABLE_TO_FINALIZE_CONTEXT		 131
 #define CMS_R_UNKNOWN_CIPHER				 141
 #define CMS_R_UNKNOWN_DIGEST_ALGORIHM			 132
diff --git a/crypto/cms/cms_dd.c b/crypto/cms/cms_dd.c
index ec7689d001..a927caad8e 100644
--- a/crypto/cms/cms_dd.c
+++ b/crypto/cms/cms_dd.c
@@ -98,8 +98,6 @@ CMS_ContentInfo *cms_DigestedData_create(const EVP_MD *md)
 BIO *cms_DigestedData_init_bio(CMS_ContentInfo *cms)
 	{
 	CMS_DigestedData *dd;
-	if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_digest)
-		return NULL;
 	dd = cms->d.digestedData;
 	return cms_DigestAlgorithm_init_bio(dd->digestAlgorithm);
 	}
diff --git a/crypto/cms/cms_enc.c b/crypto/cms/cms_enc.c
index fbf87b6735..a99ce1b5f2 100644
--- a/crypto/cms/cms_enc.c
+++ b/crypto/cms/cms_enc.c
@@ -227,13 +227,8 @@ int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
 
 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
 	{
-	CMS_EncryptedContentInfo *ec;
-	if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
-		{
-		CMSerr(CMS_F_CMS_ENCRYPTEDDATA_INIT_BIO,
-						CMS_R_NOT_ENCRYPTED_DATA);
-		return NULL;
-		}
-	ec = cms->d.encryptedData->encryptedContentInfo;
-	return cms_EncryptedContent_init_bio(ec);
+	CMS_EncryptedData *enc = cms->d.encryptedData;
+	if (enc->unprotectedAttrs)
+		enc->version = 2;
+	return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
 	}
diff --git a/crypto/cms/cms_env.c b/crypto/cms/cms_env.c
index 3a5991e016..39ebe5a0f1 100644
--- a/crypto/cms/cms_env.c
+++ b/crypto/cms/cms_env.c
@@ -101,6 +101,20 @@ static CMS_EnvelopedData *cms_enveloped_data_init(CMS_ContentInfo *cms)
 	return cms_get0_enveloped(cms);
 	}
 
+STACK_OF(CMS_RecipientInfo) *CMS_get0_RecipientInfos(CMS_ContentInfo *cms)
+	{
+	CMS_EnvelopedData *env;
+	env = cms_enveloped_data_init(cms);
+	if (!env)
+		return NULL;
+	return env->recipientInfos;
+	}
+
+int CMS_RecipientInfo_type(CMS_RecipientInfo *ri)
+	{
+	return ri->type;
+	}
+
 /* Add a recipient certificate. For now only handle key transport.
  * If we ever handle key agreement will need updating.
  */
@@ -229,6 +243,7 @@ int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
 			CMS_R_NOT_KEY_TRANSPORT);
 		return 0;
 		}
+	ktri = ri->d.ktri;
 
 	return cms_SignerIdentifier_get0_signer_id(ktri->rid,
 							keyid, issuer, sno);
@@ -236,13 +251,86 @@ int CMS_RecipientInfo_ktri_get0_signer_id(CMS_RecipientInfo *ri,
 
 int CMS_RecipientInfo_ktri_cert_cmp(CMS_RecipientInfo *ri, X509 *cert)
 	{
-	CMS_KeyTransRecipientInfo *ktri;
 	if (ri->type != CMS_RECIPINFO_TRANS)
 		{
 		CMSerr(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP,
 			CMS_R_NOT_KEY_TRANSPORT);
+		return -2;
+		}
+
+	return cms_SignerIdentifier_cert_cmp(ri->d.ktri->rid, cert);
+	}
+
+int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
+			       EVP_PKEY *pkey)
+	{
+	CMS_KeyTransRecipientInfo *ktri;
+	EVP_PKEY_CTX *pctx = NULL;
+	unsigned char *ek = NULL;
+	size_t eklen;
+
+	int ret = 0;
+
+	if (ri->type != CMS_RECIPINFO_TRANS)
+		{
+		CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,
+			CMS_R_NOT_KEY_TRANSPORT);
+		return 0;
+		}
+	ktri = ri->d.ktri;
+
+	pctx = EVP_PKEY_CTX_new(pkey, NULL);
+	if (!pctx)
 		return 0;
+
+	if (EVP_PKEY_decrypt_init(pctx) <= 0)
+		goto err;
+
+	if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DECRYPT,
+				EVP_PKEY_CTRL_CMS_DECRYPT, 0, ri) <= 0)
+		{
+		CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT, CMS_R_CTRL_ERROR);
+		goto err;
 		}
 
-	return cms_SignerIdentifier_cert_cmp(ktri->rid, cert);
+	if (EVP_PKEY_decrypt(pctx, NULL, &eklen,
+				ktri->encryptedKey->data,
+				ktri->encryptedKey->length) <= 0)
+		goto err;
+
+	ek = OPENSSL_malloc(eklen);
+
+	if (ek == NULL)
+		{
+		CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT, ERR_R_MALLOC_FAILURE);
+		goto err;
+		}
+
+	if (EVP_PKEY_decrypt(pctx, ek, &eklen,
+				ktri->encryptedKey->data,
+				ktri->encryptedKey->length) <= 0)
+		{
+		CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT, CMS_R_CMS_LIB);
+		goto err;
+		}
+
+	ret = 1;
+
+	cms->d.envelopedData->encryptedContentInfo->key = ek;
+	cms->d.envelopedData->encryptedContentInfo->keylen = eklen;
+
+	err:
+	if (pctx)
+		EVP_PKEY_CTX_free(pctx);
+	if (!ret && ek)
+		OPENSSL_free(ek);
+
+	return ret;
+	}
+
+BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms)
+	{
+	CMS_EncryptedContentInfo *ec;
+	ec = cms->d.envelopedData->encryptedContentInfo;
+	return cms_EncryptedContent_init_bio(ec);
 	}
diff --git a/crypto/cms/cms_err.c b/crypto/cms/cms_err.c
index 0d142681b4..3baa40e525 100644
--- a/crypto/cms/cms_err.c
+++ b/crypto/cms/cms_err.c
@@ -70,6 +70,7 @@
 
 static ERR_STRING_DATA CMS_str_functs[]=
 	{
+{ERR_FUNC(CMS_F_CHECK_CONTENT),	"CHECK_CONTENT"},
 {ERR_FUNC(CMS_F_CMS_ADD1_RECIPIENT_CERT),	"CMS_ADD1_RECIPIENT_CERT"},
 {ERR_FUNC(CMS_F_CMS_ADD1_SIGNER),	"CMS_add1_signer"},
 {ERR_FUNC(CMS_F_CMS_ADD1_SIGNINGTIME),	"CMS_ADD1_SIGNINGTIME"},
@@ -83,6 +84,7 @@ static ERR_STRING_DATA CMS_str_functs[]=
 {ERR_FUNC(CMS_F_CMS_DATA),	"CMS_data"},
 {ERR_FUNC(CMS_F_CMS_DATAFINAL),	"CMS_dataFinal"},
 {ERR_FUNC(CMS_F_CMS_DATAINIT),	"CMS_dataInit"},
+{ERR_FUNC(CMS_F_CMS_DECRYPT),	"CMS_decrypt"},
 {ERR_FUNC(CMS_F_CMS_DECRYPTEDCONTENT_DECRYPT_BIO),	"CMS_DECRYPTEDCONTENT_DECRYPT_BIO"},
 {ERR_FUNC(CMS_F_CMS_DECRYPTEDCONTENT_ENCRYPT_BIO),	"CMS_DECRYPTEDCONTENT_ENCRYPT_BIO"},
 {ERR_FUNC(CMS_F_CMS_DIGESTALGORITHM_FIND_CTX),	"CMS_DIGESTALGORITHM_FIND_CTX"},
@@ -106,9 +108,10 @@ static ERR_STRING_DATA CMS_str_functs[]=
 {ERR_FUNC(CMS_F_CMS_GET0_ENVELOPED),	"CMS_GET0_ENVELOPED"},
 {ERR_FUNC(CMS_F_CMS_GET0_REVOCATION_CHOICES),	"CMS_GET0_REVOCATION_CHOICES"},
 {ERR_FUNC(CMS_F_CMS_GET0_SIGNED),	"CMS_GET0_SIGNED"},
-{ERR_FUNC(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP),	"CMS_RECIPIENTINFO_KTRI_CERT_CMP"},
-{ERR_FUNC(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS),	"CMS_RECIPIENTINFO_KTRI_GET0_ALGS"},
-{ERR_FUNC(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID),	"CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID"},
+{ERR_FUNC(CMS_F_CMS_RECIPIENTINFO_DECRYPT),	"CMS_RecipientInfo_decrypt"},
+{ERR_FUNC(CMS_F_CMS_RECIPIENTINFO_KTRI_CERT_CMP),	"CMS_RecipientInfo_ktri_cert_cmp"},
+{ERR_FUNC(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_ALGS),	"CMS_RecipientInfo_ktri_get0_algs"},
+{ERR_FUNC(CMS_F_CMS_RECIPIENTINFO_KTRI_GET0_SIGNER_ID),	"CMS_RecipientInfo_ktri_get0_signer_id"},
 {ERR_FUNC(CMS_F_CMS_SET1_SIGNERIDENTIFIER),	"CMS_SET1_SIGNERIDENTIFIER"},
 {ERR_FUNC(CMS_F_CMS_SET_DETACHED),	"CMS_set_detached"},
 {ERR_FUNC(CMS_F_CMS_SIGN),	"CMS_sign"},
@@ -131,6 +134,7 @@ static ERR_STRING_DATA CMS_str_reasons[]=
 {ERR_REASON(CMS_R_CIPHER_INITIALISATION_ERROR),"cipher initialisation error"},
 {ERR_REASON(CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR),"cipher parameter initialisation error"},
 {ERR_REASON(CMS_R_CMS_DATAFINAL_ERROR)   ,"cms datafinal error"},
+{ERR_REASON(CMS_R_CMS_LIB)               ,"cms lib"},
 {ERR_REASON(CMS_R_CONTENT_NOT_FOUND)     ,"content not found"},
 {ERR_REASON(CMS_R_CONTENT_TYPE_NOT_COMPRESSED_DATA),"content type not compressed data"},
 {ERR_REASON(CMS_R_CONTENT_TYPE_NOT_ENVELOPED_DATA),"content type not enveloped data"},
@@ -152,6 +156,7 @@ static ERR_STRING_DATA CMS_str_reasons[]=
 {ERR_REASON(CMS_R_NO_DEFAULT_DIGEST)     ,"no default digest"},
 {ERR_REASON(CMS_R_NO_DIGEST_SET)         ,"no digest set"},
 {ERR_REASON(CMS_R_NO_MATCHING_DIGEST)    ,"no matching digest"},
+{ERR_REASON(CMS_R_NO_MATCHING_RECIPIENT) ,"no matching recipient"},
 {ERR_REASON(CMS_R_NO_PRIVATE_KEY)        ,"no private key"},
 {ERR_REASON(CMS_R_NO_PUBLIC_KEY)         ,"no public key"},
 {ERR_REASON(CMS_R_NO_SIGNERS)            ,"no signers"},
@@ -164,6 +169,7 @@ static ERR_STRING_DATA CMS_str_reasons[]=
 {ERR_REASON(CMS_R_TYPE_NOT_DATA)         ,"type not data"},
 {ERR_REASON(CMS_R_TYPE_NOT_DIGESTED_DATA),"type not digested data"},
 {ERR_REASON(CMS_R_TYPE_NOT_ENCRYPTED_DATA),"type not encrypted data"},
+{ERR_REASON(CMS_R_TYPE_NOT_ENVELOPED_DATA),"type not enveloped data"},
 {ERR_REASON(CMS_R_UNABLE_TO_FINALIZE_CONTEXT),"unable to finalize context"},
 {ERR_REASON(CMS_R_UNKNOWN_CIPHER)        ,"unknown cipher"},
 {ERR_REASON(CMS_R_UNKNOWN_DIGEST_ALGORIHM),"unknown digest algorihm"},
diff --git a/crypto/cms/cms_lcl.h b/crypto/cms/cms_lcl.h
index 06eeea7eeb..774ec103f7 100644
--- a/crypto/cms/cms_lcl.h
+++ b/crypto/cms/cms_lcl.h
@@ -91,7 +91,6 @@ typedef struct CMS_KEKIdentifier_st CMS_KEKIdentifier;
 typedef struct CMS_KEKRecipientInfo_st CMS_KEKRecipientInfo;
 typedef struct CMS_PasswordRecipientInfo_st CMS_PasswordRecipientInfo;
 typedef struct CMS_OtherRecipientInfo_st CMS_OtherRecipientInfo;
-typedef struct CMS_RecipientInfo_st CMS_RecipientInfo;
 
 struct CMS_ContentInfo_st
 	{
@@ -187,12 +186,6 @@ struct CMS_RecipientInfo_st
 		} d;
 	};
 
-#define CMS_RECIPINFO_TRANS		0
-#define CMS_RECIPINFO_AGREE		1
-#define CMS_RECIPINFO_KEK		2
-#define CMS_RECIPINFO_PASS		3
-#define CMS_RECIPINFO_OTHER		4
-
 typedef CMS_SignerIdentifier CMS_RecipientIdentifier;
 
 struct CMS_KeyTransRecipientInfo_st
@@ -416,9 +409,10 @@ BIO *cms_DigestAlgorithm_init_bio(X509_ALGOR *digestAlgorithm);
 int cms_DigestAlgorithm_find_ctx(EVP_MD_CTX *mctx, BIO *chain,
 					X509_ALGOR *mdalg);
 
-BIO *cms_EncryptedContent_encrypt_bio(CMS_EncryptedContentInfo *ec);
-BIO *cms_EncryptedContent_decrypt_bio(CMS_EncryptedContentInfo *ec);
+BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec);
 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms);
+
+BIO *cms_EnvelopedData_init_bio(CMS_ContentInfo *cms);
 	
 #ifdef  __cplusplus
 }
diff --git a/crypto/cms/cms_lib.c b/crypto/cms/cms_lib.c
index e691ca3a7c..7b118b8d98 100644
--- a/crypto/cms/cms_lib.c
+++ b/crypto/cms/cms_lib.c
@@ -137,6 +137,10 @@ BIO *CMS_dataInit(CMS_ContentInfo *cms, BIO *icont)
 		cmsbio = cms_EncryptedData_init_bio(cms);
 		break;
 
+		case NID_pkcs7_enveloped:
+		cmsbio = cms_EnvelopedData_init_bio(cms);
+		break;
+
 		default:
 		CMSerr(CMS_F_CMS_DATAINIT, CMS_R_UNSUPPORTED_TYPE);
 		return NULL;
diff --git a/crypto/cms/cms_sd.c b/crypto/cms/cms_sd.c
index 52860975f6..dc8e896e71 100644
--- a/crypto/cms/cms_sd.c
+++ b/crypto/cms/cms_sd.c
@@ -798,9 +798,9 @@ BIO *cms_SignedData_init_bio(CMS_ContentInfo *cms)
 	CMS_SignedData *sd;
 	BIO *chain = NULL;
 	sd = cms_get0_signed(cms);
-	cms_sd_set_version(sd);
 	if (!sd)
 		return NULL;
+	cms_sd_set_version(sd);
 	for (i = 0; i < sk_X509_ALGOR_num(sd->digestAlgorithms); i++)
 		{
 		X509_ALGOR *digestAlgorithm;
diff --git a/crypto/cms/cms_smime.c b/crypto/cms/cms_smime.c
index d1a16808e9..7a2498d735 100644
--- a/crypto/cms/cms_smime.c
+++ b/crypto/cms/cms_smime.c
@@ -113,6 +113,17 @@ static int cms_copy_content(BIO *out, BIO *in, unsigned int flags)
 
 	}
 
+static int check_content(CMS_ContentInfo *cms)
+	{
+	ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
+	if (!pos || !*pos)
+		{
+		CMSerr(CMS_F_CHECK_CONTENT, CMS_R_NO_CONTENT);
+		return 0;
+		}
+	return 1;
+	}
+
 int CMS_data(CMS_ContentInfo *cms, BIO *out, unsigned int flags)
 	{
 	BIO *cont;
@@ -156,15 +167,8 @@ int CMS_digest_verify(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 		return 0;
 		}
 
-	if (!dcont)
-		{
-		ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
-		if (!pos || !*pos)
-			{
-			CMSerr(CMS_F_CMS_DIGEST_VERIFY, CMS_R_NO_CONTENT);
-			return 0;
-			}
-		}
+	if (!dcont && !check_content(cms))
+		return 0;
 
 	cont = CMS_dataInit(cms, dcont);
 	if (!cont)
@@ -209,16 +213,8 @@ int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
 		return 0;
 		}
 
-	if (!dcont)
-		{
-		ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
-		if (!pos || !*pos)
-			{
-			CMSerr(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT,
-					CMS_R_NO_CONTENT);
-			return 0;
-			}
-		}
+	if (!dcont && !check_content(cms))
+		return 0;
 
 	if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
 		return 0;
@@ -304,15 +300,8 @@ int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
 	int i, scount = 0, ret = 0;
 	BIO *cmsbio = NULL, *tmpin = NULL;
 
-	if (!dcont)
-		{
-		ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
-		if (!pos || !*pos)
-			{
-			CMSerr(CMS_F_CMS_VERIFY, CMS_R_NO_CONTENT);
-			return 0;
-			}
-		}
+	if (!dcont && !check_content(cms))
+		return 0;
 
 	/* Attempt to find all signer certificates */
 
@@ -470,7 +459,7 @@ CMS_ContentInfo *CMS_sign(X509 *signcert, EVP_PKEY *pkey, STACK_OF(X509) *certs,
 	return NULL;
 	}
 
-/* Placeholders for now... */
+/* Placeholder for now... */
 
 CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *in,
 				const EVP_CIPHER *cipher, unsigned int flags)
@@ -478,10 +467,50 @@ CMS_ContentInfo *CMS_encrypt(STACK_OF(X509) *certs, BIO *in,
 	return NULL;
 	}
 	
-int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pkey, X509 *cert, BIO *data,
+int CMS_decrypt(CMS_ContentInfo *cms, EVP_PKEY *pk, X509 *cert,
+				BIO *dcont, BIO *out,
 				unsigned int flags)
 	{
-	return 0;
+	STACK_OF(CMS_RecipientInfo) *ris;
+	CMS_RecipientInfo *ri;
+	int i, r;
+	BIO *cont;
+	if (OBJ_obj2nid(CMS_get0_type(cms)) != NID_pkcs7_enveloped)
+		{
+		CMSerr(CMS_F_CMS_DECRYPT, CMS_R_TYPE_NOT_ENVELOPED_DATA);
+		return 0;
+		}
+	if (!dcont && !check_content(cms))
+		return 0;
+	ris = CMS_get0_RecipientInfos(cms);
+	for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++)
+		{
+		ri = sk_CMS_RecipientInfo_value(ris, i);
+		if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_TRANS)
+			continue;
+		if (cert)
+			{
+			if (CMS_RecipientInfo_ktri_cert_cmp(ri, cert) == 0)
+				{
+				if (CMS_RecipientInfo_decrypt(cms, ri, pk) <=0)
+					return 0;
+				else
+					break;
+				}
+			}
+		}
+
+	if (i == sk_CMS_RecipientInfo_num(ris))
+		{
+		CMSerr(CMS_F_CMS_DECRYPT, CMS_R_NO_MATCHING_RECIPIENT);
+		return 0;
+		}
+	cont = CMS_dataInit(cms, dcont);
+	if (!cont)
+		return 0;
+	r = cms_copy_content(out, cont, flags);
+	BIO_free_all(cont);
+	return r;
 	}
 
 int CMS_final(CMS_ContentInfo *cms, BIO *data, int flags)
@@ -528,15 +557,8 @@ int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out,
 		return 0;
 		}
 
-	if (!dcont)
-		{
-		ASN1_OCTET_STRING **pos = CMS_get0_content(cms);
-		if (!pos || !*pos)
-			{
-			CMSerr(CMS_F_CMS_UNCOMPRESS, CMS_R_NO_CONTENT);
-			return 0;
-			}
-		}
+	if (!dcont && !check_content(cms))
+		return 0;
 
 	cont = CMS_dataInit(cms, dcont);
 	if (!cont)