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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-18 03:00:34 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-18 03:00:34 +0300
commit0aaf2146ecf00f7932f472ec5aa30d999c89530c (patch)
tree690dd244437f1974b8132fcb1e360213f827bf94 /include/crypto
parent59331c215daf600a650e281b6e8ef3e1ed1174c2 (diff)
parent3fa71d0f58a9b9df84e8e79196f961bcfbf01b2e (diff)
downloadlinux-0aaf2146ecf00f7932f472ec5aa30d999c89530c.tar.xz
Merge tag 'docs-4.10-2' of git://git.lwn.net/linux
Pull more documentation updates from Jonathan Corbet: "This converts the crypto DocBook to Sphinx" * tag 'docs-4.10-2' of git://git.lwn.net/linux: crypto: doc - optimize compilation crypto: doc - clarify AEAD memory structure crypto: doc - remove crypto_alloc_ablkcipher crypto: doc - add KPP documentation crypto: doc - fix separation of cipher / req API crypto: doc - fix source comments for Sphinx crypto: doc - remove crypto API DocBook crypto: doc - convert crypto API documentation to Sphinx
Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/aead.h50
-rw-r--r--include/crypto/dh.h58
-rw-r--r--include/crypto/ecdh.h58
-rw-r--r--include/crypto/hash.h2
-rw-r--r--include/crypto/kpp.h15
-rw-r--r--include/crypto/skcipher.h4
6 files changed, 150 insertions, 37 deletions
diff --git a/include/crypto/aead.h b/include/crypto/aead.h
index 12f84327ca36..03b97629442c 100644
--- a/include/crypto/aead.h
+++ b/include/crypto/aead.h
@@ -55,14 +55,14 @@
* The scatter list pointing to the input data must contain:
*
* * for RFC4106 ciphers, the concatenation of
- * associated authentication data || IV || plaintext or ciphertext. Note, the
- * same IV (buffer) is also set with the aead_request_set_crypt call. Note,
- * the API call of aead_request_set_ad must provide the length of the AAD and
- * the IV. The API call of aead_request_set_crypt only points to the size of
- * the input plaintext or ciphertext.
+ * associated authentication data || IV || plaintext or ciphertext. Note, the
+ * same IV (buffer) is also set with the aead_request_set_crypt call. Note,
+ * the API call of aead_request_set_ad must provide the length of the AAD and
+ * the IV. The API call of aead_request_set_crypt only points to the size of
+ * the input plaintext or ciphertext.
*
* * for "normal" AEAD ciphers, the concatenation of
- * associated authentication data || plaintext or ciphertext.
+ * associated authentication data || plaintext or ciphertext.
*
* It is important to note that if multiple scatter gather list entries form
* the input data mentioned above, the first entry must not point to a NULL
@@ -452,7 +452,7 @@ static inline void aead_request_free(struct aead_request *req)
* completes
*
* The callback function is registered with the aead_request handle and
- * must comply with the following template
+ * must comply with the following template::
*
* void callback_function(struct crypto_async_request *req, int error)
*/
@@ -483,30 +483,18 @@ static inline void aead_request_set_callback(struct aead_request *req,
* destination is the ciphertext. For a decryption operation, the use is
* reversed - the source is the ciphertext and the destination is the plaintext.
*
- * For both src/dst the layout is associated data, plain/cipher text,
- * authentication tag.
- *
- * The content of the AD in the destination buffer after processing
- * will either be untouched, or it will contain a copy of the AD
- * from the source buffer. In order to ensure that it always has
- * a copy of the AD, the user must copy the AD over either before
- * or after processing. Of course this is not relevant if the user
- * is doing in-place processing where src == dst.
- *
- * IMPORTANT NOTE AEAD requires an authentication tag (MAC). For decryption,
- * the caller must concatenate the ciphertext followed by the
- * authentication tag and provide the entire data stream to the
- * decryption operation (i.e. the data length used for the
- * initialization of the scatterlist and the data length for the
- * decryption operation is identical). For encryption, however,
- * the authentication tag is created while encrypting the data.
- * The destination buffer must hold sufficient space for the
- * ciphertext and the authentication tag while the encryption
- * invocation must only point to the plaintext data size. The
- * following code snippet illustrates the memory usage
- * buffer = kmalloc(ptbuflen + (enc ? authsize : 0));
- * sg_init_one(&sg, buffer, ptbuflen + (enc ? authsize : 0));
- * aead_request_set_crypt(req, &sg, &sg, ptbuflen, iv);
+ * The memory structure for cipher operation has the following structure:
+ *
+ * - AEAD encryption input: assoc data || plaintext
+ * - AEAD encryption output: assoc data || cipherntext || auth tag
+ * - AEAD decryption input: assoc data || ciphertext || auth tag
+ * - AEAD decryption output: assoc data || plaintext
+ *
+ * Albeit the kernel requires the presence of the AAD buffer, however,
+ * the kernel does not fill the AAD buffer in the output case. If the
+ * caller wants to have that data buffer filled, the caller must either
+ * use an in-place cipher operation (i.e. same memory location for
+ * input/output memory location).
*/
static inline void aead_request_set_crypt(struct aead_request *req,
struct scatterlist *src,
diff --git a/include/crypto/dh.h b/include/crypto/dh.h
index 5102a8f282e6..6b424ad3482e 100644
--- a/include/crypto/dh.h
+++ b/include/crypto/dh.h
@@ -13,6 +13,27 @@
#ifndef _CRYPTO_DH_
#define _CRYPTO_DH_
+/**
+ * DOC: DH Helper Functions
+ *
+ * To use DH with the KPP cipher API, the following data structure and
+ * functions should be used.
+ *
+ * To use DH with KPP, the following functions should be used to operate on
+ * a DH private key. The packet private key that can be set with
+ * the KPP API function call of crypto_kpp_set_secret.
+ */
+
+/**
+ * struct dh - define a DH private key
+ *
+ * @key: Private DH key
+ * @p: Diffie-Hellman parameter P
+ * @g: Diffie-Hellman generator G
+ * @key_size: Size of the private DH key
+ * @p_size: Size of DH parameter P
+ * @g_size: Size of DH generator G
+ */
struct dh {
void *key;
void *p;
@@ -22,8 +43,45 @@ struct dh {
unsigned int g_size;
};
+/**
+ * crypto_dh_key_len() - Obtain the size of the private DH key
+ * @params: private DH key
+ *
+ * This function returns the packet DH key size. A caller can use that
+ * with the provided DH private key reference to obtain the required
+ * memory size to hold a packet key.
+ *
+ * Return: size of the key in bytes
+ */
int crypto_dh_key_len(const struct dh *params);
+
+/**
+ * crypto_dh_encode_key() - encode the private key
+ * @buf: Buffer allocated by the caller to hold the packet DH
+ * private key. The buffer should be at least crypto_dh_key_len
+ * bytes in size.
+ * @len: Length of the packet private key buffer
+ * @params: Buffer with the caller-specified private key
+ *
+ * The DH implementations operate on a packet representation of the private
+ * key.
+ *
+ * Return: -EINVAL if buffer has insufficient size, 0 on success
+ */
int crypto_dh_encode_key(char *buf, unsigned int len, const struct dh *params);
+
+/**
+ * crypto_dh_decode_key() - decode a private key
+ * @buf: Buffer holding a packet key that should be decoded
+ * @len: Lenth of the packet private key buffer
+ * @params: Buffer allocated by the caller that is filled with the
+ * unpacket DH private key.
+ *
+ * The unpacking obtains the private key by pointing @p to the correct location
+ * in @buf. Thus, both pointers refer to the same memory.
+ *
+ * Return: -EINVAL if buffer has insufficient size, 0 on success
+ */
int crypto_dh_decode_key(const char *buf, unsigned int len, struct dh *params);
#endif
diff --git a/include/crypto/ecdh.h b/include/crypto/ecdh.h
index 84bad548d194..03a64f62ba7a 100644
--- a/include/crypto/ecdh.h
+++ b/include/crypto/ecdh.h
@@ -13,18 +13,76 @@
#ifndef _CRYPTO_ECDH_
#define _CRYPTO_ECDH_
+/**
+ * DOC: ECDH Helper Functions
+ *
+ * To use ECDH with the KPP cipher API, the following data structure and
+ * functions should be used.
+ *
+ * The ECC curves known to the ECDH implementation are specified in this
+ * header file.
+ *
+ * To use ECDH with KPP, the following functions should be used to operate on
+ * an ECDH private key. The packet private key that can be set with
+ * the KPP API function call of crypto_kpp_set_secret.
+ */
+
/* Curves IDs */
#define ECC_CURVE_NIST_P192 0x0001
#define ECC_CURVE_NIST_P256 0x0002
+/**
+ * struct ecdh - define an ECDH private key
+ *
+ * @curve_id: ECC curve the key is based on.
+ * @key: Private ECDH key
+ * @key_size: Size of the private ECDH key
+ */
struct ecdh {
unsigned short curve_id;
char *key;
unsigned short key_size;
};
+/**
+ * crypto_ecdh_key_len() - Obtain the size of the private ECDH key
+ * @params: private ECDH key
+ *
+ * This function returns the packet ECDH key size. A caller can use that
+ * with the provided ECDH private key reference to obtain the required
+ * memory size to hold a packet key.
+ *
+ * Return: size of the key in bytes
+ */
int crypto_ecdh_key_len(const struct ecdh *params);
+
+/**
+ * crypto_ecdh_encode_key() - encode the private key
+ * @buf: Buffer allocated by the caller to hold the packet ECDH
+ * private key. The buffer should be at least crypto_ecdh_key_len
+ * bytes in size.
+ * @len: Length of the packet private key buffer
+ * @p: Buffer with the caller-specified private key
+ *
+ * The ECDH implementations operate on a packet representation of the private
+ * key.
+ *
+ * Return: -EINVAL if buffer has insufficient size, 0 on success
+ */
int crypto_ecdh_encode_key(char *buf, unsigned int len, const struct ecdh *p);
+
+/**
+ * crypto_ecdh_decode_key() - decode a private key
+ * @buf: Buffer holding a packet key that should be decoded
+ * @len: Lenth of the packet private key buffer
+ * @p: Buffer allocated by the caller that is filled with the
+ * unpacket ECDH private key.
+ *
+ * The unpacking obtains the private key by pointing @p to the correct location
+ * in @buf. Thus, both pointers refer to the same memory.
+ *
+ * Return: -EINVAL if buffer has insufficient size, 0 on success
+ */
int crypto_ecdh_decode_key(const char *buf, unsigned int len, struct ecdh *p);
#endif
diff --git a/include/crypto/hash.h b/include/crypto/hash.h
index 26605888a199..216a2b876147 100644
--- a/include/crypto/hash.h
+++ b/include/crypto/hash.h
@@ -605,7 +605,7 @@ static inline struct ahash_request *ahash_request_cast(
* the cipher operation completes.
*
* The callback function is registered with the &ahash_request handle and
- * must comply with the following template
+ * must comply with the following template::
*
* void callback_function(struct crypto_async_request *req, int error)
*/
diff --git a/include/crypto/kpp.h b/include/crypto/kpp.h
index 30791f75c180..4307a2f2365f 100644
--- a/include/crypto/kpp.h
+++ b/include/crypto/kpp.h
@@ -71,7 +71,7 @@ struct crypto_kpp {
*
* @reqsize: Request context size required by algorithm
* implementation
- * @base Common crypto API algorithm data structure
+ * @base: Common crypto API algorithm data structure
*/
struct kpp_alg {
int (*set_secret)(struct crypto_kpp *tfm, void *buffer,
@@ -89,7 +89,7 @@ struct kpp_alg {
};
/**
- * DOC: Generic Key-agreement Protocol Primitevs API
+ * DOC: Generic Key-agreement Protocol Primitives API
*
* The KPP API is used with the algorithm type
* CRYPTO_ALG_TYPE_KPP (listed as type "kpp" in /proc/crypto)
@@ -264,6 +264,12 @@ struct kpp_secret {
* Function invokes the specific kpp operation for a given alg.
*
* @tfm: tfm handle
+ * @buffer: Buffer holding the packet representation of the private
+ * key. The structure of the packet key depends on the particular
+ * KPP implementation. Packing and unpacking helpers are provided
+ * for ECDH and DH (see the respective header files for those
+ * implementations).
+ * @len: Length of the packet private key buffer.
*
* Return: zero on success; error code in case of error
*/
@@ -279,7 +285,10 @@ static inline int crypto_kpp_set_secret(struct crypto_kpp *tfm, void *buffer,
* crypto_kpp_generate_public_key() - Invoke kpp operation
*
* Function invokes the specific kpp operation for generating the public part
- * for a given kpp algorithm
+ * for a given kpp algorithm.
+ *
+ * To generate a private key, the caller should use a random number generator.
+ * The output of the requested length serves as the private key.
*
* @req: kpp key request
*
diff --git a/include/crypto/skcipher.h b/include/crypto/skcipher.h
index cc4d98a7892e..750b14f1ada4 100644
--- a/include/crypto/skcipher.h
+++ b/include/crypto/skcipher.h
@@ -516,7 +516,7 @@ static inline void skcipher_request_zero(struct skcipher_request *req)
* skcipher_request_set_callback() - set asynchronous callback function
* @req: request handle
* @flags: specify zero or an ORing of the flags
- * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and
+ * CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may back log and
* increase the wait queue beyond the initial maximum size;
* CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep
* @compl: callback function pointer to be registered with the request handle
@@ -533,7 +533,7 @@ static inline void skcipher_request_zero(struct skcipher_request *req)
* cipher operation completes.
*
* The callback function is registered with the skcipher_request handle and
- * must comply with the following template
+ * must comply with the following template::
*
* void callback_function(struct crypto_async_request *req, int error)
*/