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-rw-r--r--doc/crypto/BN_bn2bin.pod5
-rw-r--r--doc/crypto/BN_new.pod4
-rw-r--r--doc/crypto/EVP_EncryptInit.pod3
-rw-r--r--doc/crypto/EVP_PKEY_meth_new.pod376
-rw-r--r--doc/crypto/RSA_padding_add_PKCS1_type_1.pod7
-rw-r--r--doc/crypto/RSA_public_encrypt.pod7
-rw-r--r--doc/crypto/X509_check_private_key.pod54
-rw-r--r--doc/crypto/hmac.pod3
8 files changed, 453 insertions, 6 deletions
diff --git a/doc/crypto/BN_bn2bin.pod b/doc/crypto/BN_bn2bin.pod
index 3bed47f8f1d5..f6bb484f902f 100644
--- a/doc/crypto/BN_bn2bin.pod
+++ b/doc/crypto/BN_bn2bin.pod
@@ -70,8 +70,9 @@ BN_bn2bin() returns the length of the big-endian number placed at B<to>.
BN_bin2bn() returns the B<BIGNUM>, NULL on error.
BN_bn2hex() and BN_bn2dec() return a null-terminated string, or NULL
-on error. BN_hex2bn() and BN_dec2bn() return the number's length in
-hexadecimal or decimal digits, and 0 on error.
+on error. BN_hex2bn() and BN_dec2bn() return the number of characters
+used in parsing, or 0 on error, in which
+case no new B<BIGNUM> will be created.
BN_print_fp() and BN_print() return 1 on success, 0 on write errors.
diff --git a/doc/crypto/BN_new.pod b/doc/crypto/BN_new.pod
index ab7a105e3ad7..d446603191af 100644
--- a/doc/crypto/BN_new.pod
+++ b/doc/crypto/BN_new.pod
@@ -30,10 +30,12 @@ to the value 0.
BN_free() frees the components of the B<BIGNUM>, and if it was created
by BN_new(), also the structure itself. BN_clear_free() additionally
overwrites the data before the memory is returned to the system.
+If B<a> is NULL, nothing is done.
=head1 RETURN VALUES
-BN_new() returns a pointer to the B<BIGNUM>. If the allocation fails,
+BN_new() returns a pointer to the B<BIGNUM> initialised to the value 0.
+If the allocation fails,
it returns B<NULL> and sets an error code that can be obtained
by L<ERR_get_error(3)|ERR_get_error(3)>.
diff --git a/doc/crypto/EVP_EncryptInit.pod b/doc/crypto/EVP_EncryptInit.pod
index 0c0a30c1ffa0..dc9a2d76c5f6 100644
--- a/doc/crypto/EVP_EncryptInit.pod
+++ b/doc/crypto/EVP_EncryptInit.pod
@@ -395,8 +395,7 @@ processed (e.g. after an EVP_EncryptFinal() call).
EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, taglen, tag);
Sets the expected tag to B<taglen> bytes from B<tag>. This call is only legal
-when decrypting data and must be made B<before> any data is processed (e.g.
-before any EVP_DecryptUpdate() call).
+when decrypting data.
=head1 CCM Mode
diff --git a/doc/crypto/EVP_PKEY_meth_new.pod b/doc/crypto/EVP_PKEY_meth_new.pod
new file mode 100644
index 000000000000..041492a8f0fb
--- /dev/null
+++ b/doc/crypto/EVP_PKEY_meth_new.pod
@@ -0,0 +1,376 @@
+=pod
+
+=head1 NAME
+
+EVP_PKEY_meth_new, EVP_PKEY_meth_free, EVP_PKEY_meth_copy, EVP_PKEY_meth_find,
+EVP_PKEY_meth_add0, EVP_PKEY_METHOD,
+EVP_PKEY_meth_set_init, EVP_PKEY_meth_set_copy, EVP_PKEY_meth_set_cleanup,
+EVP_PKEY_meth_set_paramgen, EVP_PKEY_meth_set_keygen, EVP_PKEY_meth_set_sign,
+EVP_PKEY_meth_set_verify, EVP_PKEY_meth_set_verify_recover, EVP_PKEY_meth_set_signctx,
+EVP_PKEY_meth_set_verifyctx, EVP_PKEY_meth_set_encrypt, EVP_PKEY_meth_set_decrypt,
+EVP_PKEY_meth_set_derive, EVP_PKEY_meth_set_ctrl,
+EVP_PKEY_meth_get_init, EVP_PKEY_meth_get_copy, EVP_PKEY_meth_get_cleanup,
+EVP_PKEY_meth_get_paramgen, EVP_PKEY_meth_get_keygen, EVP_PKEY_meth_get_sign,
+EVP_PKEY_meth_get_verify, EVP_PKEY_meth_get_verify_recover, EVP_PKEY_meth_get_signctx,
+EVP_PKEY_meth_get_verifyctx, EVP_PKEY_meth_get_encrypt, EVP_PKEY_meth_get_decrypt,
+EVP_PKEY_meth_get_derive, EVP_PKEY_meth_get_ctrl
+- manipulating EVP_PKEY_METHOD structure
+
+=head1 SYNOPSIS
+
+ #include <openssl/evp.h>
+
+ typedef struct evp_pkey_method_st EVP_PKEY_METHOD;
+
+ EVP_PKEY_METHOD *EVP_PKEY_meth_new(int id, int flags);
+ void EVP_PKEY_meth_free(EVP_PKEY_METHOD *pmeth);
+ void EVP_PKEY_meth_copy(EVP_PKEY_METHOD *dst, const EVP_PKEY_METHOD *src);
+ const EVP_PKEY_METHOD *EVP_PKEY_meth_find(int type);
+ int EVP_PKEY_meth_add0(const EVP_PKEY_METHOD *pmeth);
+
+ void EVP_PKEY_meth_set_init(EVP_PKEY_METHOD *pmeth,
+ int (*init) (EVP_PKEY_CTX *ctx));
+ void EVP_PKEY_meth_set_copy(EVP_PKEY_METHOD *pmeth,
+ int (*copy) (EVP_PKEY_CTX *dst,
+ EVP_PKEY_CTX *src));
+ void EVP_PKEY_meth_set_cleanup(EVP_PKEY_METHOD *pmeth,
+ void (*cleanup) (EVP_PKEY_CTX *ctx));
+ void EVP_PKEY_meth_set_paramgen(EVP_PKEY_METHOD *pmeth,
+ int (*paramgen_init) (EVP_PKEY_CTX *ctx),
+ int (*paramgen) (EVP_PKEY_CTX *ctx,
+ EVP_PKEY *pkey));
+ void EVP_PKEY_meth_set_keygen(EVP_PKEY_METHOD *pmeth,
+ int (*keygen_init) (EVP_PKEY_CTX *ctx),
+ int (*keygen) (EVP_PKEY_CTX *ctx,
+ EVP_PKEY *pkey));
+ void EVP_PKEY_meth_set_sign(EVP_PKEY_METHOD *pmeth,
+ int (*sign_init) (EVP_PKEY_CTX *ctx),
+ int (*sign) (EVP_PKEY_CTX *ctx,
+ unsigned char *sig, size_t *siglen,
+ const unsigned char *tbs,
+ size_t tbslen));
+ void EVP_PKEY_meth_set_verify(EVP_PKEY_METHOD *pmeth,
+ int (*verify_init) (EVP_PKEY_CTX *ctx),
+ int (*verify) (EVP_PKEY_CTX *ctx,
+ const unsigned char *sig,
+ size_t siglen,
+ const unsigned char *tbs,
+ size_t tbslen));
+ void EVP_PKEY_meth_set_verify_recover(EVP_PKEY_METHOD *pmeth,
+ int (*verify_recover_init) (EVP_PKEY_CTX
+ *ctx),
+ int (*verify_recover) (EVP_PKEY_CTX
+ *ctx,
+ unsigned char
+ *sig,
+ size_t *siglen,
+ const unsigned
+ char *tbs,
+ size_t tbslen));
+ void EVP_PKEY_meth_set_signctx(EVP_PKEY_METHOD *pmeth,
+ int (*signctx_init) (EVP_PKEY_CTX *ctx,
+ EVP_MD_CTX *mctx),
+ int (*signctx) (EVP_PKEY_CTX *ctx,
+ unsigned char *sig,
+ size_t *siglen,
+ EVP_MD_CTX *mctx));
+ void EVP_PKEY_meth_set_verifyctx(EVP_PKEY_METHOD *pmeth,
+ int (*verifyctx_init) (EVP_PKEY_CTX *ctx,
+ EVP_MD_CTX *mctx),
+ int (*verifyctx) (EVP_PKEY_CTX *ctx,
+ const unsigned char *sig,
+ int siglen,
+ EVP_MD_CTX *mctx));
+ void EVP_PKEY_meth_set_encrypt(EVP_PKEY_METHOD *pmeth,
+ int (*encrypt_init) (EVP_PKEY_CTX *ctx),
+ int (*encryptfn) (EVP_PKEY_CTX *ctx,
+ unsigned char *out,
+ size_t *outlen,
+ const unsigned char *in,
+ size_t inlen));
+ void EVP_PKEY_meth_set_decrypt(EVP_PKEY_METHOD *pmeth,
+ int (*decrypt_init) (EVP_PKEY_CTX *ctx),
+ int (*decrypt) (EVP_PKEY_CTX *ctx,
+ unsigned char *out,
+ size_t *outlen,
+ const unsigned char *in,
+ size_t inlen));
+ void EVP_PKEY_meth_set_derive(EVP_PKEY_METHOD *pmeth,
+ int (*derive_init) (EVP_PKEY_CTX *ctx),
+ int (*derive) (EVP_PKEY_CTX *ctx,
+ unsigned char *key,
+ size_t *keylen));
+ void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth,
+ int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
+ void *p2),
+ int (*ctrl_str) (EVP_PKEY_CTX *ctx,
+ const char *type,
+ const char *value));
+
+ void EVP_PKEY_meth_get_init(EVP_PKEY_METHOD *pmeth,
+ int (**pinit) (EVP_PKEY_CTX *ctx));
+ void EVP_PKEY_meth_get_copy(EVP_PKEY_METHOD *pmeth,
+ int (**pcopy) (EVP_PKEY_CTX *dst,
+ EVP_PKEY_CTX *src));
+ void EVP_PKEY_meth_get_cleanup(EVP_PKEY_METHOD *pmeth,
+ void (**pcleanup) (EVP_PKEY_CTX *ctx));
+ void EVP_PKEY_meth_get_paramgen(EVP_PKEY_METHOD *pmeth,
+ int (**pparamgen_init) (EVP_PKEY_CTX *ctx),
+ int (**pparamgen) (EVP_PKEY_CTX *ctx,
+ EVP_PKEY *pkey));
+ void EVP_PKEY_meth_get_keygen(EVP_PKEY_METHOD *pmeth,
+ int (**pkeygen_init) (EVP_PKEY_CTX *ctx),
+ int (**pkeygen) (EVP_PKEY_CTX *ctx,
+ EVP_PKEY *pkey));
+ void EVP_PKEY_meth_get_sign(EVP_PKEY_METHOD *pmeth,
+ int (**psign_init) (EVP_PKEY_CTX *ctx),
+ int (**psign) (EVP_PKEY_CTX *ctx,
+ unsigned char *sig, size_t *siglen,
+ const unsigned char *tbs,
+ size_t tbslen));
+ void EVP_PKEY_meth_get_verify(EVP_PKEY_METHOD *pmeth,
+ int (**pverify_init) (EVP_PKEY_CTX *ctx),
+ int (**pverify) (EVP_PKEY_CTX *ctx,
+ const unsigned char *sig,
+ size_t siglen,
+ const unsigned char *tbs,
+ size_t tbslen));
+ void EVP_PKEY_meth_get_verify_recover(EVP_PKEY_METHOD *pmeth,
+ int (**pverify_recover_init) (EVP_PKEY_CTX
+ *ctx),
+ int (**pverify_recover) (EVP_PKEY_CTX
+ *ctx,
+ unsigned char
+ *sig,
+ size_t *siglen,
+ const unsigned
+ char *tbs,
+ size_t tbslen));
+ void EVP_PKEY_meth_get_signctx(EVP_PKEY_METHOD *pmeth,
+ int (**psignctx_init) (EVP_PKEY_CTX *ctx,
+ EVP_MD_CTX *mctx),
+ int (**psignctx) (EVP_PKEY_CTX *ctx,
+ unsigned char *sig,
+ size_t *siglen,
+ EVP_MD_CTX *mctx));
+ void EVP_PKEY_meth_get_verifyctx(EVP_PKEY_METHOD *pmeth,
+ int (**pverifyctx_init) (EVP_PKEY_CTX *ctx,
+ EVP_MD_CTX *mctx),
+ int (**pverifyctx) (EVP_PKEY_CTX *ctx,
+ const unsigned char *sig,
+ int siglen,
+ EVP_MD_CTX *mctx));
+ void EVP_PKEY_meth_get_encrypt(EVP_PKEY_METHOD *pmeth,
+ int (**pencrypt_init) (EVP_PKEY_CTX *ctx),
+ int (**pencryptfn) (EVP_PKEY_CTX *ctx,
+ unsigned char *out,
+ size_t *outlen,
+ const unsigned char *in,
+ size_t inlen));
+ void EVP_PKEY_meth_get_decrypt(EVP_PKEY_METHOD *pmeth,
+ int (**pdecrypt_init) (EVP_PKEY_CTX *ctx),
+ int (**pdecrypt) (EVP_PKEY_CTX *ctx,
+ unsigned char *out,
+ size_t *outlen,
+ const unsigned char *in,
+ size_t inlen));
+ void EVP_PKEY_meth_get_derive(EVP_PKEY_METHOD *pmeth,
+ int (**pderive_init) (EVP_PKEY_CTX *ctx),
+ int (**pderive) (EVP_PKEY_CTX *ctx,
+ unsigned char *key,
+ size_t *keylen));
+ void EVP_PKEY_meth_get_ctrl(EVP_PKEY_METHOD *pmeth,
+ int (**pctrl) (EVP_PKEY_CTX *ctx, int type, int p1,
+ void *p2),
+ int (**pctrl_str) (EVP_PKEY_CTX *ctx,
+ const char *type,
+ const char *value));
+
+=head1 DESCRIPTION
+
+B<EVP_PKEY_METHOD> is a structure which holds a set of methods for a
+specific public key cryptographic algorithm. Those methods are usually
+used to perform different jobs, such as generating a key, signing or
+verifying, encrypting or decrypting, etc.
+
+There are two places where the B<EVP_PKEY_METHOD> objects are stored: one
+is a built-in static array representing the standard methods for different
+algorithms, and the other one is a stack of user-defined application-specific
+methods, which can be manipulated by using L<EVP_PKEY_meth_add0(3)>.
+
+The B<EVP_PKEY_METHOD> objects are usually referenced by B<EVP_PKEY_CTX>
+objects.
+
+=head2 Methods
+
+The methods are the underlying implementations of a particular public key
+algorithm present by the B<EVP_PKEY_CTX> object.
+
+ int (*init) (EVP_PKEY_CTX *ctx);
+ int (*copy) (EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src);
+ void (*cleanup) (EVP_PKEY_CTX *ctx);
+
+The init() method is called to initialize algorithm-specific data when a new
+B<EVP_PKEY_CTX> is created. As opposed to init(), the cleanup() method is called
+when an B<EVP_PKEY_CTX> is freed. The copy() method is called when an B<EVP_PKEY_CTX>
+is being duplicated. Refer to L<EVP_PKEY_CTX_new(3)>, L<EVP_PKEY_CTX_new_id(3)>,
+L<EVP_PKEY_CTX_free(3)> and L<EVP_PKEY_CTX_dup(3)>.
+
+ int (*paramgen_init) (EVP_PKEY_CTX *ctx);
+ int (*paramgen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
+
+The paramgen_init() and paramgen() methods deal with key parameter generation.
+They are called by L<EVP_PKEY_paramgen_init(3)> and L<EVP_PKEY_paramgen(3)> to
+handle the parameter generation process.
+
+ int (*keygen_init) (EVP_PKEY_CTX *ctx);
+ int (*keygen) (EVP_PKEY_CTX *ctx, EVP_PKEY *pkey);
+
+The keygen_init() and keygen() methods are used to generate the actual key for
+the specified algorithm. They are called by L<EVP_PKEY_keygen_init(3)> and
+L<EVP_PKEY_keygen(3)>.
+
+ int (*sign_init) (EVP_PKEY_CTX *ctx);
+ int (*sign) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
+ const unsigned char *tbs, size_t tbslen);
+
+The sign_init() and sign() methods are used to generate the signature of a
+piece of data using a private key. They are called by L<EVP_PKEY_sign_init(3)>
+and L<EVP_PKEY_sign(3)>.
+
+ int (*verify_init) (EVP_PKEY_CTX *ctx);
+ int (*verify) (EVP_PKEY_CTX *ctx,
+ const unsigned char *sig, size_t siglen,
+ const unsigned char *tbs, size_t tbslen);
+
+The verify_init() and verify() methods are used to verify whether a signature is
+valid. They are called by L<EVP_PKEY_verify_init(3)> and L<EVP_PKEY_verify(3)>.
+
+ int (*verify_recover_init) (EVP_PKEY_CTX *ctx);
+ int (*verify_recover) (EVP_PKEY_CTX *ctx,
+ unsigned char *rout, size_t *routlen,
+ const unsigned char *sig, size_t siglen);
+
+The verify_recover_init() and verify_recover() methods are used to verify a
+signature and then recover the digest from the signature (for instance, a
+signature that was generated by RSA signing algorithm). They are called by
+L<EVP_PKEY_verify_recover_init(3)> and L<EVP_PKEY_verify_recover(3)>.
+
+ int (*signctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
+ int (*signctx) (EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
+ EVP_MD_CTX *mctx);
+
+The signctx_init() and signctx() methods are used to sign a digest present by
+a B<EVP_MD_CTX> object. They are called by the EVP_DigestSign functions. See
+L<EVP_DigestSignInit(3)> for detail.
+
+ int (*verifyctx_init) (EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx);
+ int (*verifyctx) (EVP_PKEY_CTX *ctx, const unsigned char *sig, int siglen,
+ EVP_MD_CTX *mctx);
+
+The verifyctx_init() and verifyctx() methods are used to verify a signature
+against the data in a B<EVP_MD_CTX> object. They are called by the various
+EVP_DigestVerify functions. See L<EVP_DigestVerifyInit(3)> for detail.
+
+ int (*encrypt_init) (EVP_PKEY_CTX *ctx);
+ int (*encrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
+ const unsigned char *in, size_t inlen);
+
+The encrypt_init() and encrypt() methods are used to encrypt a piece of data.
+They are called by L<EVP_PKEY_encrypt_init(3)> and L<EVP_PKEY_encrypt(3)>.
+
+ int (*decrypt_init) (EVP_PKEY_CTX *ctx);
+ int (*decrypt) (EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen,
+ const unsigned char *in, size_t inlen);
+
+The decrypt_init() and decrypt() methods are used to decrypt a piece of data.
+They are called by L<EVP_PKEY_decrypt_init(3)> and L<EVP_PKEY_decrypt(3)>.
+
+ int (*derive_init) (EVP_PKEY_CTX *ctx);
+ int (*derive) (EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen);
+
+The derive_init() and derive() methods are used to derive the shared secret
+from a public key algorithm (for instance, the DH algorithm). They are called by
+L<EVP_PKEY_derive_init(3)> and L<EVP_PKEY_derive(3)>.
+
+ int (*ctrl) (EVP_PKEY_CTX *ctx, int type, int p1, void *p2);
+ int (*ctrl_str) (EVP_PKEY_CTX *ctx, const char *type, const char *value);
+
+The ctrl() and ctrl_str() methods are used to adjust algorithm-specific
+settings. See L<EVP_PKEY_CTX_ctrl(3)> and related functions for detail.
+
+ int (*digestsign) (EVP_MD_CTX *ctx, unsigned char *sig, size_t *siglen,
+ const unsigned char *tbs, size_t tbslen);
+ int (*digestverify) (EVP_MD_CTX *ctx, const unsigned char *sig,
+ size_t siglen, const unsigned char *tbs,
+ size_t tbslen);
+
+The digestsign() and digestverify() methods are used to generate or verify
+a signature in a one-shot mode. They could be called by L<EVP_DigetSign(3)>
+and L<EVP_DigestVerify(3)>.
+
+=head2 Functions
+
+EVP_PKEY_meth_new() creates and returns a new B<EVP_PKEY_METHOD> object,
+and associates the given B<id> and B<flags>. The following flags are
+supported:
+
+ EVP_PKEY_FLAG_AUTOARGLEN
+ EVP_PKEY_FLAG_SIGCTX_CUSTOM
+
+If an B<EVP_PKEY_METHOD> is set with the B<EVP_PKEY_FLAG_AUTOARGLEN> flag, the
+maximum size of the output buffer will be automatically calculated or checked
+in corresponding EVP methods by the EVP framework. Thus the implementations of
+these methods don't need to care about handling the case of returning output
+buffer size by themselves. For details on the output buffer size, refer to
+L<EVP_PKEY_sign(3)>.
+
+The B<EVP_PKEY_FLAG_SIGCTX_CUSTOM> is used to indicate the signctx() method
+of an B<EVP_PKEY_METHOD> is always called by the EVP framework while doing a
+digest signing operation by calling L<EVP_DigestSignFinal(3)>.
+
+EVP_PKEY_meth_free() frees an existing B<EVP_PKEY_METHOD> pointed by
+B<pmeth>.
+
+EVP_PKEY_meth_copy() copies an B<EVP_PKEY_METHOD> object from B<src>
+to B<dst>.
+
+EVP_PKEY_meth_find() finds an B<EVP_PKEY_METHOD> object with the B<id>.
+This function first searches through the user-defined method objects and
+then the built-in objects.
+
+EVP_PKEY_meth_add0() adds B<pmeth> to the user defined stack of methods.
+
+The EVP_PKEY_meth_set functions set the corresponding fields of
+B<EVP_PKEY_METHOD> structure with the arguments passed.
+
+The EVP_PKEY_meth_get functions get the corresponding fields of
+B<EVP_PKEY_METHOD> structure to the arguments provided.
+
+=head1 RETURN VALUES
+
+EVP_PKEY_meth_new() returns a pointer to a new B<EVP_PKEY_METHOD>
+object or returns NULL on error.
+
+EVP_PKEY_meth_free() and EVP_PKEY_meth_copy() do not return values.
+
+EVP_PKEY_meth_find() returns a pointer to the found B<EVP_PKEY_METHOD>
+object or returns NULL if not found.
+
+EVP_PKEY_meth_add0() returns 1 if method is added successfully or 0
+if an error occurred.
+
+All EVP_PKEY_meth_set and EVP_PKEY_meth_get functions have no return
+values. For the 'get' functions, function pointers are returned by
+arguments.
+
+=head1 COPYRIGHT
+
+Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut
diff --git a/doc/crypto/RSA_padding_add_PKCS1_type_1.pod b/doc/crypto/RSA_padding_add_PKCS1_type_1.pod
index b8f678fe729d..f20f815d4786 100644
--- a/doc/crypto/RSA_padding_add_PKCS1_type_1.pod
+++ b/doc/crypto/RSA_padding_add_PKCS1_type_1.pod
@@ -104,6 +104,13 @@ The RSA_padding_check_xxx() functions return the length of the
recovered data, -1 on error. Error codes can be obtained by calling
L<ERR_get_error(3)|ERR_get_error(3)>.
+=head1 WARNING
+
+The RSA_padding_check_PKCS1_type_2() padding check leaks timing
+information which can potentially be used to mount a Bleichenbacher
+padding oracle attack. This is an inherent weakness in the PKCS #1
+v1.5 padding design. Prefer PKCS1_OAEP padding.
+
=head1 SEE ALSO
L<RSA_public_encrypt(3)|RSA_public_encrypt(3)>,
diff --git a/doc/crypto/RSA_public_encrypt.pod b/doc/crypto/RSA_public_encrypt.pod
index 0541f348b3e2..4d7c1f2cac7a 100644
--- a/doc/crypto/RSA_public_encrypt.pod
+++ b/doc/crypto/RSA_public_encrypt.pod
@@ -67,6 +67,13 @@ recovered plaintext.
On error, -1 is returned; the error codes can be
obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
+=head1 WARNING
+
+Decryption failures in the RSA_PKCS1_PADDING mode leak information
+which can potentially be used to mount a Bleichenbacher padding oracle
+attack. This is an inherent weakness in the PKCS #1 v1.5 padding
+design. Prefer RSA_PKCS1_OAEP_PADDING.
+
=head1 CONFORMING TO
SSL, PKCS #1 v2.0
diff --git a/doc/crypto/X509_check_private_key.pod b/doc/crypto/X509_check_private_key.pod
new file mode 100644
index 000000000000..a1fb07b1097e
--- /dev/null
+++ b/doc/crypto/X509_check_private_key.pod
@@ -0,0 +1,54 @@
+=pod
+
+=head1 NAME
+
+X509_check_private_key, X509_REQ_check_private_key - check the consistency
+of a private key with the public key in an X509 certificate or certificate
+request
+
+=head1 SYNOPSIS
+
+ #include <openssl/x509.h>
+
+ int X509_check_private_key(X509 *x, EVP_PKEY *k);
+
+ int X509_REQ_check_private_key(X509_REQ *x, EVP_PKEY *k);
+
+=head1 DESCRIPTION
+
+X509_check_private_key() function checks the consistency of private
+key B<k> with the public key in B<x>.
+
+X509_REQ_check_private_key() is equivalent to X509_check_private_key()
+except that B<x> represents a certificate request of structure B<X509_REQ>.
+
+=head1 RETURN VALUE
+
+X509_check_private_key() and X509_REQ_check_private_key() return 1 if
+the keys match each other, and 0 if not.
+
+If the key is invalid or an error occurred, the reason code can be
+obtained using L<ERR_get_error(3)>.
+
+=head1 BUGS
+
+The B<check_private_key> functions don't check if B<k> itself is indeed
+a private key or not. It merely compares the public materials (e.g. exponent
+and modulus of an RSA key) and/or key parameters (e.g. EC params of an EC key)
+of a key pair. So if you pass a public key to these functions in B<k>, it will
+return success.
+
+=head1 SEE ALSO
+
+L<ERR_get_error(3)>
+
+=head1 COPYRIGHT
+
+Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut
diff --git a/doc/crypto/hmac.pod b/doc/crypto/hmac.pod
index 2c8f20a20188..ca9798af62c3 100644
--- a/doc/crypto/hmac.pod
+++ b/doc/crypto/hmac.pod
@@ -38,7 +38,8 @@ B<key_len> bytes long.
It places the result in B<md> (which must have space for the output of
the hash function, which is no more than B<EVP_MAX_MD_SIZE> bytes).
If B<md> is NULL, the digest is placed in a static array. The size of
-the output is placed in B<md_len>, unless it is B<NULL>.
+the output is placed in B<md_len>, unless it is B<NULL>. Note: passing a NULL
+value for B<md> to use the static array is not thread safe.
B<evp_md> can be EVP_sha1(), EVP_ripemd160() etc.