diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 2af478e..f2356bd 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -19,8 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/efi.h>
-#include <linux/verify_pefile.h>
-#include <keys/system_keyring.h>
+#include <linux/verification.h>
 
 #include <asm/bootparam.h>
 #include <asm/setup.h>
@@ -529,18 +528,9 @@
 #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
 static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
 {
-	bool trusted;
-	int ret;
-
-	ret = verify_pefile_signature(kernel, kernel_len,
-				      system_trusted_keyring,
-				      VERIFYING_KEXEC_PE_SIGNATURE,
-				      &trusted);
-	if (ret < 0)
-		return ret;
-	if (!trusted)
-		return -EKEYREJECTED;
-	return 0;
+	return verify_pefile_signature(kernel, kernel_len,
+				       NULL,
+				       VERIFYING_KEXEC_PE_SIGNATURE);
 }
 #endif
 
diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index f418032..a83bffe 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c
@@ -108,16 +108,25 @@
 #ifdef CONFIG_SYSTEM_DATA_VERIFICATION
 
 /**
- * Verify a PKCS#7-based signature on system data.
- * @data: The data to be verified.
+ * verify_pkcs7_signature - Verify a PKCS#7-based signature on system data.
+ * @data: The data to be verified (NULL if expecting internal data).
  * @len: Size of @data.
  * @raw_pkcs7: The PKCS#7 message that is the signature.
  * @pkcs7_len: The size of @raw_pkcs7.
+ * @trusted_keys: Trusted keys to use (NULL for system_trusted_keyring).
  * @usage: The use to which the key is being put.
+ * @view_content: Callback to gain access to content.
+ * @ctx: Context for callback.
  */
-int system_verify_data(const void *data, unsigned long len,
-		       const void *raw_pkcs7, size_t pkcs7_len,
-		       enum key_being_used_for usage)
+int verify_pkcs7_signature(const void *data, size_t len,
+			   const void *raw_pkcs7, size_t pkcs7_len,
+			   struct key *trusted_keys,
+			   int untrusted_error,
+			   enum key_being_used_for usage,
+			   int (*view_content)(void *ctx,
+					       const void *data, size_t len,
+					       size_t asn1hdrlen),
+			   void *ctx)
 {
 	struct pkcs7_message *pkcs7;
 	bool trusted;
@@ -128,7 +137,7 @@
 		return PTR_ERR(pkcs7);
 
 	/* The data should be detached - so we need to supply it. */
-	if (pkcs7_supply_detached_data(pkcs7, data, len) < 0) {
+	if (data && pkcs7_supply_detached_data(pkcs7, data, len) < 0) {
 		pr_err("PKCS#7 signature with non-detached data\n");
 		ret = -EBADMSG;
 		goto error;
@@ -138,13 +147,29 @@
 	if (ret < 0)
 		goto error;
 
-	ret = pkcs7_validate_trust(pkcs7, system_trusted_keyring, &trusted);
+	if (!trusted_keys)
+		trusted_keys = system_trusted_keyring;
+	ret = pkcs7_validate_trust(pkcs7, trusted_keys, &trusted);
 	if (ret < 0)
 		goto error;
 
-	if (!trusted) {
+	if (!trusted && untrusted_error) {
 		pr_err("PKCS#7 signature not signed with a trusted key\n");
-		ret = -ENOKEY;
+		ret = untrusted_error;
+		goto error;
+	}
+
+	if (view_content) {
+		size_t asn1hdrlen;
+
+		ret = pkcs7_get_content_data(pkcs7, &data, &len, &asn1hdrlen);
+		if (ret < 0) {
+			if (ret == -ENODATA)
+				pr_devel("PKCS#7 message does not contain data\n");
+			goto error;
+		}
+
+		ret = view_content(ctx, data, len, asn1hdrlen);
 	}
 
 error:
@@ -152,6 +177,6 @@
 	pr_devel("<==%s() = %d\n", __func__, ret);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(system_verify_data);
+EXPORT_SYMBOL_GPL(verify_pkcs7_signature);
 
 #endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
diff --git a/crypto/asymmetric_keys/Kconfig b/crypto/asymmetric_keys/Kconfig
index 91a7e04..f7d2ef9 100644
--- a/crypto/asymmetric_keys/Kconfig
+++ b/crypto/asymmetric_keys/Kconfig
@@ -40,8 +40,7 @@
 
 config PKCS7_TEST_KEY
 	tristate "PKCS#7 testing key type"
-	depends on PKCS7_MESSAGE_PARSER
-	select SYSTEM_TRUSTED_KEYRING
+	depends on SYSTEM_DATA_VERIFICATION
 	help
 	  This option provides a type of key that can be loaded up from a
 	  PKCS#7 message - provided the message is signed by a trusted key.  If
@@ -54,6 +53,7 @@
 config SIGNED_PE_FILE_VERIFICATION
 	bool "Support for PE file signature verification"
 	depends on PKCS7_MESSAGE_PARSER=y
+	depends on SYSTEM_DATA_VERIFICATION
 	select ASN1
 	select OID_REGISTRY
 	help
diff --git a/crypto/asymmetric_keys/mscode_parser.c b/crypto/asymmetric_keys/mscode_parser.c
index 3242cbf..6a76d5c 100644
--- a/crypto/asymmetric_keys/mscode_parser.c
+++ b/crypto/asymmetric_keys/mscode_parser.c
@@ -21,19 +21,13 @@
 /*
  * Parse a Microsoft Individual Code Signing blob
  */
-int mscode_parse(struct pefile_context *ctx)
+int mscode_parse(void *_ctx, const void *content_data, size_t data_len,
+		 size_t asn1hdrlen)
 {
-	const void *content_data;
-	size_t data_len;
-	int ret;
+	struct pefile_context *ctx = _ctx;
 
-	ret = pkcs7_get_content_data(ctx->pkcs7, &content_data, &data_len, 1);
-
-	if (ret) {
-		pr_debug("PKCS#7 message does not contain data\n");
-		return ret;
-	}
-
+	content_data -= asn1hdrlen;
+	data_len += asn1hdrlen;
 	pr_devel("Data: %zu [%*ph]\n", data_len, (unsigned)(data_len),
 		 content_data);
 
@@ -129,7 +123,6 @@
 {
 	struct pefile_context *ctx = context;
 
-	ctx->digest = value;
-	ctx->digest_len = vlen;
-	return 0;
+	ctx->digest = kmemdup(value, vlen, GFP_KERNEL);
+	return ctx->digest ? 0 : -ENOMEM;
 }
diff --git a/crypto/asymmetric_keys/pkcs7_key_type.c b/crypto/asymmetric_keys/pkcs7_key_type.c
index e2d0edb..ab9bf53 100644
--- a/crypto/asymmetric_keys/pkcs7_key_type.c
+++ b/crypto/asymmetric_keys/pkcs7_key_type.c
@@ -13,12 +13,9 @@
 #include <linux/key.h>
 #include <linux/err.h>
 #include <linux/module.h>
+#include <linux/verification.h>
 #include <linux/key-type.h>
-#include <keys/asymmetric-type.h>
-#include <crypto/pkcs7.h>
 #include <keys/user-type.h>
-#include <keys/system_keyring.h>
-#include "pkcs7_parser.h"
 
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("PKCS#7 testing key type");
@@ -29,57 +26,44 @@
 		 "Usage to specify when verifying the PKCS#7 message");
 
 /*
+ * Retrieve the PKCS#7 message content.
+ */
+static int pkcs7_view_content(void *ctx, const void *data, size_t len,
+			      size_t asn1hdrlen)
+{
+	struct key_preparsed_payload *prep = ctx;
+	const void *saved_prep_data;
+	size_t saved_prep_datalen;
+	int ret;
+
+	saved_prep_data = prep->data;
+	saved_prep_datalen = prep->datalen;
+	prep->data = data;
+	prep->datalen = len;
+
+	ret = user_preparse(prep);
+
+	prep->data = saved_prep_data;
+	prep->datalen = saved_prep_datalen;
+	return ret;
+}
+
+/*
  * Preparse a PKCS#7 wrapped and validated data blob.
  */
 static int pkcs7_preparse(struct key_preparsed_payload *prep)
 {
 	enum key_being_used_for usage = pkcs7_usage;
-	struct pkcs7_message *pkcs7;
-	const void *data, *saved_prep_data;
-	size_t datalen, saved_prep_datalen;
-	bool trusted;
-	int ret;
-
-	kenter("");
 
 	if (usage >= NR__KEY_BEING_USED_FOR) {
 		pr_err("Invalid usage type %d\n", usage);
 		return -EINVAL;
 	}
 
-	saved_prep_data = prep->data;
-	saved_prep_datalen = prep->datalen;
-	pkcs7 = pkcs7_parse_message(saved_prep_data, saved_prep_datalen);
-	if (IS_ERR(pkcs7)) {
-		ret = PTR_ERR(pkcs7);
-		goto error;
-	}
-
-	ret = pkcs7_verify(pkcs7, usage);
-	if (ret < 0)
-		goto error_free;
-
-	ret = pkcs7_validate_trust(pkcs7, system_trusted_keyring, &trusted);
-	if (ret < 0)
-		goto error_free;
-	if (!trusted)
-		pr_warn("PKCS#7 message doesn't chain back to a trusted key\n");
-
-	ret = pkcs7_get_content_data(pkcs7, &data, &datalen, false);
-	if (ret < 0)
-		goto error_free;
-
-	prep->data = data;
-	prep->datalen = datalen;
-	ret = user_preparse(prep);
-	prep->data = saved_prep_data;
-	prep->datalen = saved_prep_datalen;
-
-error_free:
-	pkcs7_free_message(pkcs7);
-error:
-	kleave(" = %d", ret);
-	return ret;
+	return verify_pkcs7_signature(NULL, 0,
+				      prep->data, prep->datalen,
+				      NULL, -ENOKEY, usage,
+				      pkcs7_view_content, prep);
 }
 
 /*
diff --git a/crypto/asymmetric_keys/pkcs7_parser.c b/crypto/asymmetric_keys/pkcs7_parser.c
index 8357016..af4cd86 100644
--- a/crypto/asymmetric_keys/pkcs7_parser.c
+++ b/crypto/asymmetric_keys/pkcs7_parser.c
@@ -168,24 +168,25 @@
  * @pkcs7: The preparsed PKCS#7 message to access
  * @_data: Place to return a pointer to the data
  * @_data_len: Place to return the data length
- * @want_wrapper: True if the ASN.1 object header should be included in the data
+ * @_headerlen: Size of ASN.1 header not included in _data
  *
- * Get access to the data content of the PKCS#7 message, including, optionally,
- * the header of the ASN.1 object that contains it.  Returns -ENODATA if the
- * data object was missing from the message.
+ * Get access to the data content of the PKCS#7 message.  The size of the
+ * header of the ASN.1 object that contains it is also provided and can be used
+ * to adjust *_data and *_data_len to get the entire object.
+ *
+ * Returns -ENODATA if the data object was missing from the message.
  */
 int pkcs7_get_content_data(const struct pkcs7_message *pkcs7,
 			   const void **_data, size_t *_data_len,
-			   bool want_wrapper)
+			   size_t *_headerlen)
 {
-	size_t wrapper;
-
 	if (!pkcs7->data)
 		return -ENODATA;
 
-	wrapper = want_wrapper ? pkcs7->data_hdrlen : 0;
-	*_data = pkcs7->data - wrapper;
-	*_data_len = pkcs7->data_len + wrapper;
+	*_data = pkcs7->data;
+	*_data_len = pkcs7->data_len;
+	if (_headerlen)
+		*_headerlen = pkcs7->data_hdrlen;
 	return 0;
 }
 EXPORT_SYMBOL_GPL(pkcs7_get_content_data);
diff --git a/crypto/asymmetric_keys/verify_pefile.c b/crypto/asymmetric_keys/verify_pefile.c
index 7e8c233..2653510 100644
--- a/crypto/asymmetric_keys/verify_pefile.c
+++ b/crypto/asymmetric_keys/verify_pefile.c
@@ -16,7 +16,7 @@
 #include <linux/err.h>
 #include <linux/pe.h>
 #include <linux/asn1.h>
-#include <crypto/pkcs7.h>
+#include <linux/verification.h>
 #include <crypto/hash.h>
 #include "verify_pefile.h"
 
@@ -392,9 +392,8 @@
  * verify_pefile_signature - Verify the signature on a PE binary image
  * @pebuf: Buffer containing the PE binary image
  * @pelen: Length of the binary image
- * @trust_keyring: Signing certificates to use as starting points
+ * @trust_keys: Signing certificate(s) to use as starting points
  * @usage: The use to which the key is being put.
- * @_trusted: Set to true if trustworth, false otherwise
  *
  * Validate that the certificate chain inside the PKCS#7 message inside the PE
  * binary image intersects keys we already know and trust.
@@ -418,14 +417,10 @@
  * May also return -ENOMEM.
  */
 int verify_pefile_signature(const void *pebuf, unsigned pelen,
-			    struct key *trusted_keyring,
-			    enum key_being_used_for usage,
-			    bool *_trusted)
+			    struct key *trusted_keys,
+			    enum key_being_used_for usage)
 {
-	struct pkcs7_message *pkcs7;
 	struct pefile_context ctx;
-	const void *data;
-	size_t datalen;
 	int ret;
 
 	kenter("");
@@ -439,19 +434,10 @@
 	if (ret < 0)
 		return ret;
 
-	pkcs7 = pkcs7_parse_message(pebuf + ctx.sig_offset, ctx.sig_len);
-	if (IS_ERR(pkcs7))
-		return PTR_ERR(pkcs7);
-	ctx.pkcs7 = pkcs7;
-
-	ret = pkcs7_get_content_data(ctx.pkcs7, &data, &datalen, false);
-	if (ret < 0 || datalen == 0) {
-		pr_devel("PKCS#7 message does not contain data\n");
-		ret = -EBADMSG;
-		goto error;
-	}
-
-	ret = mscode_parse(&ctx);
+	ret = verify_pkcs7_signature(NULL, 0,
+				     pebuf + ctx.sig_offset, ctx.sig_len,
+				     trusted_keys, -EKEYREJECTED, usage,
+				     mscode_parse, &ctx);
 	if (ret < 0)
 		goto error;
 
@@ -462,16 +448,8 @@
 	 * contents.
 	 */
 	ret = pefile_digest_pe(pebuf, pelen, &ctx);
-	if (ret < 0)
-		goto error;
-
-	ret = pkcs7_verify(pkcs7, usage);
-	if (ret < 0)
-		goto error;
-
-	ret = pkcs7_validate_trust(pkcs7, trusted_keyring, _trusted);
 
 error:
-	pkcs7_free_message(ctx.pkcs7);
+	kfree(ctx.digest);
 	return ret;
 }
diff --git a/crypto/asymmetric_keys/verify_pefile.h b/crypto/asymmetric_keys/verify_pefile.h
index a133eb8..cd4d209 100644
--- a/crypto/asymmetric_keys/verify_pefile.h
+++ b/crypto/asymmetric_keys/verify_pefile.h
@@ -9,7 +9,6 @@
  * 2 of the Licence, or (at your option) any later version.
  */
 
-#include <linux/verify_pefile.h>
 #include <crypto/pkcs7.h>
 #include <crypto/hash_info.h>
 
@@ -23,7 +22,6 @@
 	unsigned	sig_offset;
 	unsigned	sig_len;
 	const struct section_header *secs;
-	struct pkcs7_message *pkcs7;
 
 	/* PKCS#7 MS Individual Code Signing content */
 	const void	*digest;		/* Digest */
@@ -39,4 +37,5 @@
 /*
  * mscode_parser.c
  */
-extern int mscode_parse(struct pefile_context *ctx);
+extern int mscode_parse(void *_ctx, const void *content_data, size_t data_len,
+			size_t asn1hdrlen);
diff --git a/include/crypto/pkcs7.h b/include/crypto/pkcs7.h
index 441aff9..8323e3e 100644
--- a/include/crypto/pkcs7.h
+++ b/include/crypto/pkcs7.h
@@ -12,6 +12,7 @@
 #ifndef _CRYPTO_PKCS7_H
 #define _CRYPTO_PKCS7_H
 
+#include <linux/verification.h>
 #include <crypto/public_key.h>
 
 struct key;
@@ -26,7 +27,7 @@
 
 extern int pkcs7_get_content_data(const struct pkcs7_message *pkcs7,
 				  const void **_data, size_t *_datalen,
-				  bool want_wrapper);
+				  size_t *_headerlen);
 
 /*
  * pkcs7_trust.c
diff --git a/include/crypto/public_key.h b/include/crypto/public_key.h
index 2f5de5c..b3928e8 100644
--- a/include/crypto/public_key.h
+++ b/include/crypto/public_key.h
@@ -15,20 +15,6 @@
 #define _LINUX_PUBLIC_KEY_H
 
 /*
- * The use to which an asymmetric key is being put.
- */
-enum key_being_used_for {
-	VERIFYING_MODULE_SIGNATURE,
-	VERIFYING_FIRMWARE_SIGNATURE,
-	VERIFYING_KEXEC_PE_SIGNATURE,
-	VERIFYING_KEY_SIGNATURE,
-	VERIFYING_KEY_SELF_SIGNATURE,
-	VERIFYING_UNSPECIFIED_SIGNATURE,
-	NR__KEY_BEING_USED_FOR
-};
-extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR];
-
-/*
  * Cryptographic data for the public-key subtype of the asymmetric key type.
  *
  * Note that this may include private part of the key as well as the public
diff --git a/include/keys/asymmetric-type.h b/include/keys/asymmetric-type.h
index 70a8775..d1e23dd 100644
--- a/include/keys/asymmetric-type.h
+++ b/include/keys/asymmetric-type.h
@@ -15,6 +15,7 @@
 #define _KEYS_ASYMMETRIC_TYPE_H
 
 #include <linux/key-type.h>
+#include <linux/verification.h>
 
 extern struct key_type key_type_asymmetric;
 
diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h
index 39fd38c..b2d645a 100644
--- a/include/keys/system_keyring.h
+++ b/include/keys/system_keyring.h
@@ -15,6 +15,7 @@
 #ifdef CONFIG_SYSTEM_TRUSTED_KEYRING
 
 #include <linux/key.h>
+#include <linux/verification.h>
 #include <crypto/public_key.h>
 
 extern struct key *system_trusted_keyring;
@@ -29,12 +30,6 @@
 }
 #endif
 
-#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
-extern int system_verify_data(const void *data, unsigned long len,
-			      const void *raw_pkcs7, size_t pkcs7_len,
-			      enum key_being_used_for usage);
-#endif
-
 #ifdef CONFIG_IMA_MOK_KEYRING
 extern struct key *ima_mok_keyring;
 extern struct key *ima_blacklist_keyring;
diff --git a/include/linux/verification.h b/include/linux/verification.h
new file mode 100644
index 0000000..bb0fcf9
--- /dev/null
+++ b/include/linux/verification.h
@@ -0,0 +1,50 @@
+/* Signature verification
+ *
+ * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#ifndef _LINUX_VERIFICATION_H
+#define _LINUX_VERIFICATION_H
+
+/*
+ * The use to which an asymmetric key is being put.
+ */
+enum key_being_used_for {
+	VERIFYING_MODULE_SIGNATURE,
+	VERIFYING_FIRMWARE_SIGNATURE,
+	VERIFYING_KEXEC_PE_SIGNATURE,
+	VERIFYING_KEY_SIGNATURE,
+	VERIFYING_KEY_SELF_SIGNATURE,
+	VERIFYING_UNSPECIFIED_SIGNATURE,
+	NR__KEY_BEING_USED_FOR
+};
+extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR];
+
+#ifdef CONFIG_SYSTEM_DATA_VERIFICATION
+
+struct key;
+
+extern int verify_pkcs7_signature(const void *data, size_t len,
+				  const void *raw_pkcs7, size_t pkcs7_len,
+				  struct key *trusted_keys,
+				  int untrusted_error,
+				  enum key_being_used_for usage,
+				  int (*view_content)(void *ctx,
+						      const void *data, size_t len,
+						      size_t asn1hdrlen),
+				  void *ctx);
+
+#ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
+extern int verify_pefile_signature(const void *pebuf, unsigned pelen,
+				   struct key *trusted_keys,
+				   enum key_being_used_for usage);
+#endif
+
+#endif /* CONFIG_SYSTEM_DATA_VERIFICATION */
+#endif /* _LINUX_VERIFY_PEFILE_H */
diff --git a/include/linux/verify_pefile.h b/include/linux/verify_pefile.h
deleted file mode 100644
index da2049b..0000000
--- a/include/linux/verify_pefile.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/* Signed PE file verification
- *
- * Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-
-#ifndef _LINUX_VERIFY_PEFILE_H
-#define _LINUX_VERIFY_PEFILE_H
-
-#include <crypto/public_key.h>
-
-extern int verify_pefile_signature(const void *pebuf, unsigned pelen,
-				   struct key *trusted_keyring,
-				   enum key_being_used_for usage,
-				   bool *_trusted);
-
-#endif /* _LINUX_VERIFY_PEFILE_H */
diff --git a/kernel/module_signing.c b/kernel/module_signing.c
index 64b9dea..593aace 100644
--- a/kernel/module_signing.c
+++ b/kernel/module_signing.c
@@ -80,6 +80,7 @@
 		return -EBADMSG;
 	}
 
-	return system_verify_data(mod, modlen, mod + modlen, sig_len,
-				  VERIFYING_MODULE_SIGNATURE);
+	return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len,
+				      NULL, -ENOKEY, VERIFYING_MODULE_SIGNATURE,
+				      NULL, NULL);
 }