Reorganise encrypted content info code to avoid duplication and be more

consistent with other content types.

crypto/cms/cms.h

@@ -142,7 +142,7 @@ int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
 				const unsigned char *key, size_t keylen,
 				BIO *dcont, BIO *out, unsigned int flags);
 
-int CMS_EncryptedData_set1_key(BIO *b, CMS_ContentInfo *cms,
+int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
 				const unsigned char *key, size_t keylen);
 
 int CMS_verify(CMS_ContentInfo *cms, STACK_OF(X509) *certs,
@@ -249,6 +249,7 @@ void ERR_load_CMS_strings(void);
 #define CMS_F_CMS_ADD1_SIGNER				 100
 #define CMS_F_CMS_ADD1_SIGNINGTIME			 101
 #define CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT		 137
+#define CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT_BIO		 142
 #define CMS_F_CMS_COMPRESS				 102
 #define CMS_F_CMS_COMPRESSEDDATA_CREATE			 103
 #define CMS_F_CMS_COMPRESSEDDATA_INIT_BIO		 104
@@ -257,12 +258,19 @@ 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_DECRYPTEDCONTENT_DECRYPT_BIO		 145
+#define CMS_F_CMS_DECRYPTEDCONTENT_ENCRYPT_BIO		 143
 #define CMS_F_CMS_DIGESTALGORITHM_FIND_CTX		 110
 #define CMS_F_CMS_DIGESTALGORITHM_INIT_BIO		 111
 #define CMS_F_CMS_DIGESTEDDATA_DO_FINAL			 112
 #define CMS_F_CMS_DIGEST_VERIFY				 113
+#define CMS_F_CMS_ENCRYPTEDCONTENT_DECRYPT_BIO		 146
+#define CMS_F_CMS_ENCRYPTEDCONTENT_ENCRYPT_BIO		 144
+#define CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO		 148
 #define CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO		 138
 #define CMS_F_CMS_ENCRYPTEDDATA_DECRYPT			 140
+#define CMS_F_CMS_ENCRYPTEDDATA_INIT_BIO		 147
+#define CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY		 141
 #define CMS_F_CMS_ENCRYPTED_DATA_DECRYPT		 139
 #define CMS_F_CMS_ENVELOPED_DATA_INIT			 114
 #define CMS_F_CMS_FINAL					 115
@@ -307,6 +315,7 @@ void ERR_load_CMS_strings(void);
 #define CMS_R_MD_BIO_INIT_ERROR				 111
 #define CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH	 112
 #define CMS_R_MESSAGEDIGEST_WRONG_LENGTH		 113
+#define CMS_R_NOT_ENCRYPTED_DATA			 143
 #define CMS_R_NOT_KEY_TRANSPORT				 114
 #define CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE		 115
 #define CMS_R_NO_CONTENT				 116

crypto/cms/cms_enc.c

@@ -63,135 +63,164 @@
 
 /* CMS EncryptedData Utilities */
 
-/* Set up EncryptedContentInfo based on supplied cipher bio */
+DECLARE_ASN1_ITEM(CMS_EncryptedData)
 
-int cms_bio_to_EncryptedContent(CMS_EncryptedContentInfo *ec,
-					const unsigned char *key, int keylen,
-					BIO *b)
+/* Return BIO based on EncryptedContentInfo and key */
+
+BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
 	{
-	EVP_CIPHER_CTX *ctx = NULL;
-	unsigned char iv[EVP_MAX_IV_LENGTH], *piv;
-	int ivlen;
+	BIO *b;
+	EVP_CIPHER_CTX *ctx;
+	const EVP_CIPHER *ciph;
+	X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
+	unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
 
-	BIO_get_cipher_ctx(b, &ctx);
+	int enc;
 
-	/* If necessary set key length */
+	enc = ec->cipher ? 1 : 0;
 
-	if (keylen != EVP_CIPHER_CTX_key_length(ctx))
+	b = BIO_new(BIO_f_cipher());
+	if (!b)
 		{
-		if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0)
-			{
-			CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
-				CMS_R_INVALID_KEY_LENGTH);
-			return 0;
-			}
+		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+							ERR_R_MALLOC_FAILURE);
+		return NULL;
 		}
 
-	/* Generate a random IV if we need one */
+	BIO_get_cipher_ctx(b, &ctx);
 
-	ivlen = EVP_CIPHER_CTX_iv_length(ctx);
-	if (ivlen > 0)
-		{
-		if (RAND_pseudo_bytes(iv, ivlen) <= 0)
-			return 0;
-		piv = iv;
-		}
+	if (enc)
+		calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
 	else
-		piv = NULL;
-
-	if (EVP_CipherInit_ex(ctx, NULL, NULL, key, piv, 1) <= 0)
 		{
-		CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
-				CMS_R_CIPHER_INITIALISATION_ERROR);
-		return 0;
-		}
+		ciph = EVP_get_cipherbyobj(calg->algorithm);
 
-	ec->contentEncryptionAlgorithm->algorithm =
-			OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
-
-	if (piv)
-		{
-		ec->contentEncryptionAlgorithm->parameter = ASN1_TYPE_new();
-		if (!ec->contentEncryptionAlgorithm->parameter)
-			{
-			CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
-							ERR_R_MALLOC_FAILURE);
-			return 0;
-			}
-		if (EVP_CIPHER_param_to_asn1(ctx, 
-			ec->contentEncryptionAlgorithm->parameter) <= 0)
+		if (!ciph)
 			{
-			CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
-				CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
-			return 0;
+			CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+							CMS_R_UNKNOWN_CIPHER);
+			goto err;
 			}
 		}
 
-	return 1;
-	}
-
-/* Return BIO based on EncryptedContentInfo and key */
-
-int cms_EncryptedContent_to_bio(BIO *b, CMS_EncryptedContentInfo *ec,
-					const unsigned char *key, int keylen)
-	{
-	EVP_CIPHER_CTX *ctx;
-	const EVP_CIPHER *ciph;
-	BIO_get_cipher_ctx(b, &ctx);
-
-	ciph = EVP_get_cipherbyobj(ec->contentEncryptionAlgorithm->algorithm);
-
-	if (!ciph)
+	if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
 		{
-		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, CMS_R_UNKNOWN_CIPHER);
-		goto err;
-		}
-
-	if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, 0) <= 0)
-		{
-		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
+		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 				CMS_R_CIPHER_INITIALISATION_ERROR);
 		goto err;
 		}
 
 	/* If necessary set key length */
 
-	if (keylen != EVP_CIPHER_CTX_key_length(ctx))
+	if (ec->keylen != EVP_CIPHER_CTX_key_length(ctx))
 		{
-		if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0)
+		if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
 			{
-			CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
+			CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 				CMS_R_INVALID_KEY_LENGTH);
 			goto err;
 			}
 		}
 
-	if (EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, 0) <= 0)
+	if (enc)
+		{
+		int ivlen;
+		/* Generate a random IV if we need one */
+		ivlen = EVP_CIPHER_CTX_iv_length(ctx);
+		if (ivlen > 0)
+			{
+			if (RAND_pseudo_bytes(iv, ivlen) <= 0)
+				goto err;
+			piv = iv;
+			}
+		}
+	else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
+			{
+			CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+				CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
+			goto err;
+			}
+
+	if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
 		{
-		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
+		CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 				CMS_R_CIPHER_INITIALISATION_ERROR);
 		goto err;
 		}
 
-	if (EVP_CIPHER_asn1_to_param(ctx, 
-			ec->contentEncryptionAlgorithm->parameter) <= 0)
+	if (piv)
+		{
+		calg->parameter = ASN1_TYPE_new();
+		if (!calg->parameter)
+			{
+			CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
+							ERR_R_MALLOC_FAILURE);
+			goto err;
+			}
+		if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
 			{
-			CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
+			CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 				CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 			goto err;
 			}
-	return 1;
+		}
+	return b;
 
 	err:
-	return 0;
+	BIO_free(b);
+	return NULL;
 	}
 
-int CMS_EncryptedData_set1_key(BIO *b, CMS_ContentInfo *cms,
+int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec, 
+				const EVP_CIPHER *cipher,
+				const unsigned char *key, size_t keylen)
+	{
+	ec->cipher = cipher;
+	ec->key = OPENSSL_malloc(keylen);
+	if (!ec->key)
+		return 0;
+	if (cipher)
+		ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
+	memcpy(ec->key, key, keylen);
+	ec->keylen = keylen;
+	return 1;
+	}
+
+int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
 				const unsigned char *key, size_t keylen)
 	{
 	CMS_EncryptedContentInfo *ec;
-	if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
+	if (ciph)
+		{
+		cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
+		if (!cms->d.encryptedData)
+			{
+			CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
+				ERR_R_MALLOC_FAILURE);
+			return 0;
+			}
+		cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
+		cms->d.encryptedData->version = 0;
+		}
+	else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
+		{
+		CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
+						CMS_R_NOT_ENCRYPTED_DATA);
 		return 0;
+		}
+	ec = cms->d.encryptedData->encryptedContentInfo;
+	return cms_EncryptedContent_init(ec, ciph, key, keylen);
+	}
+
+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_to_bio(b, ec, key, keylen);
+	return cms_EncryptedContent_init_bio(ec);
 	}

crypto/cms/cms_err.c

@@ -74,6 +74,7 @@ static ERR_STRING_DATA CMS_str_functs[]=
 {ERR_FUNC(CMS_F_CMS_ADD1_SIGNER),	"CMS_add1_signer"},
 {ERR_FUNC(CMS_F_CMS_ADD1_SIGNINGTIME),	"CMS_ADD1_SIGNINGTIME"},
 {ERR_FUNC(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT),	"CMS_BIO_TO_ENCRYPTEDCONTENT"},
+{ERR_FUNC(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT_BIO),	"CMS_BIO_TO_ENCRYPTEDCONTENT_BIO"},
 {ERR_FUNC(CMS_F_CMS_COMPRESS),	"CMS_compress"},
 {ERR_FUNC(CMS_F_CMS_COMPRESSEDDATA_CREATE),	"CMS_COMPRESSEDDATA_CREATE"},
 {ERR_FUNC(CMS_F_CMS_COMPRESSEDDATA_INIT_BIO),	"CMS_COMPRESSEDDATA_INIT_BIO"},
@@ -82,12 +83,19 @@ 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_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"},
 {ERR_FUNC(CMS_F_CMS_DIGESTALGORITHM_INIT_BIO),	"CMS_DIGESTALGORITHM_INIT_BIO"},
 {ERR_FUNC(CMS_F_CMS_DIGESTEDDATA_DO_FINAL),	"CMS_DIGESTEDDATA_DO_FINAL"},
 {ERR_FUNC(CMS_F_CMS_DIGEST_VERIFY),	"CMS_digest_verify"},
+{ERR_FUNC(CMS_F_CMS_ENCRYPTEDCONTENT_DECRYPT_BIO),	"CMS_ENCRYPTEDCONTENT_DECRYPT_BIO"},
+{ERR_FUNC(CMS_F_CMS_ENCRYPTEDCONTENT_ENCRYPT_BIO),	"CMS_ENCRYPTEDCONTENT_ENCRYPT_BIO"},
+{ERR_FUNC(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO),	"CMS_ENCRYPTEDCONTENT_INIT_BIO"},
 {ERR_FUNC(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO),	"CMS_ENCRYPTEDCONTENT_TO_BIO"},
 {ERR_FUNC(CMS_F_CMS_ENCRYPTEDDATA_DECRYPT),	"CMS_EncryptedData_decrypt"},
+{ERR_FUNC(CMS_F_CMS_ENCRYPTEDDATA_INIT_BIO),	"CMS_ENCRYPTEDDATA_INIT_BIO"},
+{ERR_FUNC(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY),	"CMS_EncryptedData_set1_key"},
 {ERR_FUNC(CMS_F_CMS_ENCRYPTED_DATA_DECRYPT),	"CMS_ENCRYPTED_DATA_DECRYPT"},
 {ERR_FUNC(CMS_F_CMS_ENVELOPED_DATA_INIT),	"CMS_ENVELOPED_DATA_INIT"},
 {ERR_FUNC(CMS_F_CMS_FINAL),	"CMS_final"},
@@ -135,6 +143,7 @@ static ERR_STRING_DATA CMS_str_reasons[]=
 {ERR_REASON(CMS_R_MD_BIO_INIT_ERROR)     ,"md bio init error"},
 {ERR_REASON(CMS_R_MESSAGEDIGEST_ATTRIBUTE_WRONG_LENGTH),"messagedigest attribute wrong length"},
 {ERR_REASON(CMS_R_MESSAGEDIGEST_WRONG_LENGTH),"messagedigest wrong length"},
+{ERR_REASON(CMS_R_NOT_ENCRYPTED_DATA)    ,"not encrypted data"},
 {ERR_REASON(CMS_R_NOT_KEY_TRANSPORT)     ,"not key transport"},
 {ERR_REASON(CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE),"not supported for this key type"},
 {ERR_REASON(CMS_R_NO_CONTENT)            ,"no content"},

crypto/cms/cms_lcl.h

@@ -169,6 +169,10 @@ struct CMS_EncryptedContentInfo_st
 	ASN1_OBJECT *contentType;
 	X509_ALGOR *contentEncryptionAlgorithm;
 	ASN1_OCTET_STRING *encryptedContent;
+	/* Content encryption algorithm and key */
+	const EVP_CIPHER *cipher;
+	unsigned char *key;
+	size_t keylen;
 	};
 
 struct CMS_RecipientInfo_st
@@ -255,7 +259,7 @@ struct CMS_KEKRecipientInfo_st
  	CMS_KEKIdentifier *kekid;
  	X509_ALGOR *keyEncryptionAlgorithm;
  	ASN1_OCTET_STRING *encryptedKey;
-	/* Extra Info symmetric key to use */
+	/* Extra info: symmetric key to use */
 	unsigned char *key;
 	size_t keylen;
 	};
@@ -412,11 +416,9 @@ BIO *cms_DigestAlgorithm_init_bio(X509_ALGOR *digestAlgorithm);
 int cms_DigestAlgorithm_find_ctx(EVP_MD_CTX *mctx, BIO *chain,
 					X509_ALGOR *mdalg);
 
-int cms_bio_to_EncryptedContent(CMS_EncryptedContentInfo *ec,
-					const unsigned char *key, int keylen,
-					BIO *b);
-int cms_EncryptedContent_to_bio(BIO *b, CMS_EncryptedContentInfo *ec,
-					const unsigned char *key, int keylen);
+BIO *cms_EncryptedContent_encrypt_bio(CMS_EncryptedContentInfo *ec);
+BIO *cms_EncryptedContent_decrypt_bio(CMS_EncryptedContentInfo *ec);
+BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms);
 	
 #ifdef  __cplusplus
 }

crypto/cms/cms_lib.c

@@ -68,12 +68,6 @@ DECLARE_ASN1_ITEM(CMS_RevocationInfoChoice)
 DECLARE_STACK_OF(CMS_CertificateChoices)
 DECLARE_STACK_OF(CMS_RevocationInfoChoice)
 
-#if 0
-IMPLEMENT_ASN1_ALLOC_FUNCTIONS(CMS_CertificateChoices)
-IMPLEMENT_ASN1_ALLOC_FUNCTIONS(CMS_RevocationInfoChoice)
-#endif
-
-
 const ASN1_OBJECT *CMS_get0_type(CMS_ContentInfo *cms)
 	{
 	return cms->contentType;
@@ -140,7 +134,7 @@ BIO *CMS_dataInit(CMS_ContentInfo *cms, BIO *icont)
 #endif
 
 		case NID_pkcs7_encrypted:
-		cmsbio = BIO_new(BIO_f_cipher());
+		cmsbio = cms_EncryptedData_init_bio(cms);
 		break;
 
 		default:

crypto/cms/cms_smime.c

@@ -212,16 +212,37 @@ int CMS_EncryptedData_decrypt(CMS_ContentInfo *cms,
 			}
 		}
 
+	if (CMS_EncryptedData_set1_key(cms, NULL, key, keylen) <= 0)
+		return 0;
 	cont = CMS_dataInit(cms, dcont);
 	if (!cont)
 		return 0;
-	r = CMS_EncryptedData_set1_key(cont, cms, key, keylen);
-	if (r)
-		r = cms_copy_content(out, cont, flags);
+	r = cms_copy_content(out, cont, flags);
 	BIO_free_all(cont);
 	return r;
 	}
 
+CMS_ContentInfo *CMS_EncryptedData_encrypt(BIO *in, const EVP_CIPHER *cipher,
+					const unsigned char *key, size_t keylen,
+					unsigned int flags)
+	{
+	CMS_ContentInfo *cms;
+	cms = CMS_ContentInfo_new();
+	if (!cms)
+		return NULL;
+	if (!CMS_EncryptedData_set1_key(cms, cipher, key, keylen))
+		return NULL;
+
+	if(!(flags & CMS_DETACHED))
+		CMS_set_detached(cms, 0);
+
+	if ((flags & (CMS_STREAM|CMS_PARTIAL)) || CMS_final(cms, in, flags))
+		return cms;
+
+	CMS_ContentInfo_free(cms);
+	return NULL;
+	}
+
 static int cms_signerinfo_verify_cert(CMS_SignerInfo *si,
 					X509_STORE *store,
 					STACK_OF(X509) *certs,