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boringssl/include/openssl/evp.h
Adam Langley 310d3f63f3 Change |EVP_PKEY_up_ref| to return int. 
Upstream have added |EVP_PKEY_up_ref|, but their version returns an int.
Having this function with a different signature like that is dangerous
so this change aligns BoringSSL with upstream. Users of this function in
Chromium and internally should already have been updated.

Change-Id: I0a7aeaf1a1ca3b0f0c635e2ee3826aa100b18157
Reviewed-on: https://boringssl-review.googlesource.com/8736
Reviewed-by: David Benjamin <davidben@google.com>
2016-07-12 17:55:41 +00:00

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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#ifndef OPENSSL_HEADER_EVP_H
#define OPENSSL_HEADER_EVP_H
#include <openssl/base.h>
#include <openssl/thread.h>
/* OpenSSL included digest and cipher functions in this header so we include
* them for users that still expect that.
*
* TODO(fork): clean up callers so that they include what they use. */
#include <openssl/aead.h>
#include <openssl/base64.h>
#include <openssl/cipher.h>
#include <openssl/digest.h>
#include <openssl/nid.h>
#if defined(__cplusplus)
extern "C" {
#endif
/* EVP abstracts over public/private key algorithms. */
/* Public key objects. */
/* EVP_PKEY_new creates a new, empty public-key object and returns it or NULL
* on allocation failure. */
OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_new(void);
/* EVP_PKEY_free frees all data referenced by |pkey| and then frees |pkey|
* itself. */
OPENSSL_EXPORT void EVP_PKEY_free(EVP_PKEY *pkey);
/* EVP_PKEY_up_ref increments the reference count of |pkey| and returns one. */
OPENSSL_EXPORT int EVP_PKEY_up_ref(EVP_PKEY *pkey);
/* EVP_PKEY_is_opaque returns one if |pkey| is opaque. Opaque keys are backed by
* custom implementations which do not expose key material and parameters. It is
* an error to attempt to duplicate, export, or compare an opaque key. */
OPENSSL_EXPORT int EVP_PKEY_is_opaque(const EVP_PKEY *pkey);
/* EVP_PKEY_supports_digest returns one if |pkey| supports digests of
* type |md|. This is intended for use with EVP_PKEYs backing custom
* implementations which can't sign all digests. */
OPENSSL_EXPORT int EVP_PKEY_supports_digest(const EVP_PKEY *pkey,
const EVP_MD *md);
/* EVP_PKEY_cmp compares |a| and |b| and returns one if they are equal, zero if
* not and a negative number on error.
*
* WARNING: this differs from the traditional return value of a "cmp"
* function. */
OPENSSL_EXPORT int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b);
/* EVP_PKEY_copy_parameters sets the parameters of |to| to equal the parameters
* of |from|. It returns one on success and zero on error. */
OPENSSL_EXPORT int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from);
/* EVP_PKEY_missing_parameters returns one if |pkey| is missing needed
* parameters or zero if not, or if the algorithm doesn't take parameters. */
OPENSSL_EXPORT int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey);
/* EVP_PKEY_size returns the maximum size, in bytes, of a signature signed by
* |pkey|. For an RSA key, this returns the number of bytes needed to represent
* the modulus. For an EC key, this returns the maximum size of a DER-encoded
* ECDSA signature. */
OPENSSL_EXPORT int EVP_PKEY_size(const EVP_PKEY *pkey);
/* EVP_PKEY_bits returns the "size", in bits, of |pkey|. For an RSA key, this
* returns the bit length of the modulus. For an EC key, this returns the bit
* length of the group order. */
OPENSSL_EXPORT int EVP_PKEY_bits(EVP_PKEY *pkey);
/* EVP_PKEY_id returns the type of |pkey|, which is one of the |EVP_PKEY_*|
* values. */
OPENSSL_EXPORT int EVP_PKEY_id(const EVP_PKEY *pkey);
/* EVP_PKEY_type returns |nid| if |nid| is a known key type and |NID_undef|
* otherwise. */
OPENSSL_EXPORT int EVP_PKEY_type(int nid);
/* Getting and setting concrete public key types.
*
* The following functions get and set the underlying public key in an
* |EVP_PKEY| object. The |set1| functions take an additional reference to the
* underlying key and return one on success or zero on error. The |assign|
* functions adopt the caller's reference. The |get1| functions return a fresh
* reference to the underlying object or NULL if |pkey| is not of the correct
* type. The |get0| functions behave the same but return a non-owning
* pointer. */
OPENSSL_EXPORT int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key);
OPENSSL_EXPORT int EVP_PKEY_assign_RSA(EVP_PKEY *pkey, RSA *key);
OPENSSL_EXPORT RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey);
OPENSSL_EXPORT RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey);
OPENSSL_EXPORT int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key);
OPENSSL_EXPORT int EVP_PKEY_assign_DSA(EVP_PKEY *pkey, DSA *key);
OPENSSL_EXPORT DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey);
OPENSSL_EXPORT DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey);
OPENSSL_EXPORT int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key);
OPENSSL_EXPORT int EVP_PKEY_assign_EC_KEY(EVP_PKEY *pkey, EC_KEY *key);
OPENSSL_EXPORT EC_KEY *EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey);
OPENSSL_EXPORT EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey);
#define EVP_PKEY_NONE NID_undef
#define EVP_PKEY_RSA NID_rsaEncryption
#define EVP_PKEY_DSA NID_dsa
#define EVP_PKEY_EC NID_X9_62_id_ecPublicKey
/* EVP_PKEY_assign sets the underlying key of |pkey| to |key|, which must be of
* the given type. The |type| argument should be one of the |EVP_PKEY_*|
* values. */
OPENSSL_EXPORT int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key);
/* EVP_PKEY_set_type sets the type of |pkey| to |type|, which should be one of
* the |EVP_PKEY_*| values. It returns one if sucessful or zero otherwise. If
* |pkey| is NULL, it simply reports whether the type is known. */
OPENSSL_EXPORT int EVP_PKEY_set_type(EVP_PKEY *pkey, int type);
/* EVP_PKEY_cmp_parameters compares the parameters of |a| and |b|. It returns
* one if they match, zero if not, or a negative number of on error.
*
* WARNING: the return value differs from the usual return value convention. */
OPENSSL_EXPORT int EVP_PKEY_cmp_parameters(const EVP_PKEY *a,
const EVP_PKEY *b);
/* ASN.1 functions */
/* EVP_parse_public_key decodes a DER-encoded SubjectPublicKeyInfo structure
* (RFC 5280) from |cbs| and advances |cbs|. It returns a newly-allocated
* |EVP_PKEY| or NULL on error.
*
* The caller must check the type of the parsed public key to ensure it is
* suitable and validate other desired key properties such as RSA modulus size
* or EC curve. */
OPENSSL_EXPORT EVP_PKEY *EVP_parse_public_key(CBS *cbs);
/* EVP_marshal_public_key marshals |key| as a DER-encoded SubjectPublicKeyInfo
* structure (RFC 5280) and appends the result to |cbb|. It returns one on
* success and zero on error. */
OPENSSL_EXPORT int EVP_marshal_public_key(CBB *cbb, const EVP_PKEY *key);
/* EVP_parse_private_key decodes a DER-encoded PrivateKeyInfo structure (RFC
* 5208) from |cbs| and advances |cbs|. It returns a newly-allocated |EVP_PKEY|
* or NULL on error.
*
* The caller must check the type of the parsed private key to ensure it is
* suitable and validate other desired key properties such as RSA modulus size
* or EC curve.
*
* A PrivateKeyInfo ends with an optional set of attributes. These are not
* processed and so this function will silently ignore any trailing data in the
* structure. */
OPENSSL_EXPORT EVP_PKEY *EVP_parse_private_key(CBS *cbs);
/* EVP_marshal_private_key marshals |key| as a DER-encoded PrivateKeyInfo
* structure (RFC 5208) and appends the result to |cbb|. It returns one on
* success and zero on error. */
OPENSSL_EXPORT int EVP_marshal_private_key(CBB *cbb, const EVP_PKEY *key);
/* Signing */
/* EVP_DigestSignInit sets up |ctx| for a signing operation with |type| and
* |pkey|. The |ctx| argument must have been initialised with
* |EVP_MD_CTX_init|. If |pctx| is not NULL, the |EVP_PKEY_CTX| of the signing
* operation will be written to |*pctx|; this can be used to set alternative
* signing options.
*
* It returns one on success, or zero on error. */
OPENSSL_EXPORT int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
const EVP_MD *type, ENGINE *e,
EVP_PKEY *pkey);
/* EVP_DigestSignUpdate appends |len| bytes from |data| to the data which will
* be signed in |EVP_DigestSignFinal|. It returns one. */
OPENSSL_EXPORT int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data,
size_t len);
/* EVP_DigestSignFinal signs the data that has been included by one or more
* calls to |EVP_DigestSignUpdate|. If |out_sig| is NULL then |*out_sig_len| is
* set to the maximum number of output bytes. Otherwise, on entry,
* |*out_sig_len| must contain the length of the |out_sig| buffer. If the call
* is successful, the signature is written to |out_sig| and |*out_sig_len| is
* set to its length.
*
* It returns one on success, or zero on error. */
OPENSSL_EXPORT int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig,
size_t *out_sig_len);
/* Verifying */
/* EVP_DigestVerifyInit sets up |ctx| for a signature verification operation
* with |type| and |pkey|. The |ctx| argument must have been initialised with
* |EVP_MD_CTX_init|. If |pctx| is not NULL, the |EVP_PKEY_CTX| of the signing
* operation will be written to |*pctx|; this can be used to set alternative
* signing options.
*
* It returns one on success, or zero on error. */
OPENSSL_EXPORT int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx,
const EVP_MD *type, ENGINE *e,
EVP_PKEY *pkey);
/* EVP_DigestVerifyUpdate appends |len| bytes from |data| to the data which
* will be verified by |EVP_DigestVerifyFinal|. It returns one. */
OPENSSL_EXPORT int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data,
size_t len);
/* EVP_DigestVerifyFinal verifies that |sig_len| bytes of |sig| are a valid
* signature for the data that has been included by one or more calls to
* |EVP_DigestVerifyUpdate|. It returns one on success and zero otherwise. */
OPENSSL_EXPORT int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig,
size_t sig_len);
/* Signing (old functions) */
/* EVP_SignInit_ex configures |ctx|, which must already have been initialised,
* for a fresh signing operation using the hash function |type|. It returns one
* on success and zero otherwise.
*
* (In order to initialise |ctx|, either obtain it initialised with
* |EVP_MD_CTX_create|, or use |EVP_MD_CTX_init|.) */
OPENSSL_EXPORT int EVP_SignInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type,
ENGINE *impl);
/* EVP_SignInit is a deprecated version of |EVP_SignInit_ex|.
*
* TODO(fork): remove. */
OPENSSL_EXPORT int EVP_SignInit(EVP_MD_CTX *ctx, const EVP_MD *type);
/* EVP_SignUpdate appends |len| bytes from |data| to the data which will be
* signed in |EVP_SignFinal|. */
OPENSSL_EXPORT int EVP_SignUpdate(EVP_MD_CTX *ctx, const void *data,
size_t len);
/* EVP_SignFinal signs the data that has been included by one or more calls to
* |EVP_SignUpdate|, using the key |pkey|, and writes it to |sig|. On entry,
* |sig| must point to at least |EVP_PKEY_size(pkey)| bytes of space. The
* actual size of the signature is written to |*out_sig_len|.
*
* It returns one on success and zero otherwise.
*
* It does not modify |ctx|, thus it's possible to continue to use |ctx| in
* order to sign a longer message. */
OPENSSL_EXPORT int EVP_SignFinal(const EVP_MD_CTX *ctx, uint8_t *sig,
unsigned int *out_sig_len, EVP_PKEY *pkey);
/* Verifying (old functions) */
/* EVP_VerifyInit_ex configures |ctx|, which must already have been
* initialised, for a fresh signature verification operation using the hash
* function |type|. It returns one on success and zero otherwise.
*
* (In order to initialise |ctx|, either obtain it initialised with
* |EVP_MD_CTX_create|, or use |EVP_MD_CTX_init|.) */
OPENSSL_EXPORT int EVP_VerifyInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type,
ENGINE *impl);
/* EVP_VerifyInit is a deprecated version of |EVP_VerifyInit_ex|.
*
* TODO(fork): remove. */
OPENSSL_EXPORT int EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type);
/* EVP_VerifyUpdate appends |len| bytes from |data| to the data which will be
* signed in |EVP_VerifyFinal|. */
OPENSSL_EXPORT int EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *data,
size_t len);
/* EVP_VerifyFinal verifies that |sig_len| bytes of |sig| are a valid
* signature, by |pkey|, for the data that has been included by one or more
* calls to |EVP_VerifyUpdate|.
*
* It returns one on success and zero otherwise.
*
* It does not modify |ctx|, thus it's possible to continue to use |ctx| in
* order to sign a longer message. */
OPENSSL_EXPORT int EVP_VerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig,
size_t sig_len, EVP_PKEY *pkey);
/* Printing */
/* EVP_PKEY_print_public prints a textual representation of the public key in
* |pkey| to |out|. Returns one on success or zero otherwise. */
OPENSSL_EXPORT int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey,
int indent, ASN1_PCTX *pctx);
/* EVP_PKEY_print_private prints a textual representation of the private key in
* |pkey| to |out|. Returns one on success or zero otherwise. */
OPENSSL_EXPORT int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey,
int indent, ASN1_PCTX *pctx);
/* EVP_PKEY_print_params prints a textual representation of the parameters in
* |pkey| to |out|. Returns one on success or zero otherwise. */
OPENSSL_EXPORT int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey,
int indent, ASN1_PCTX *pctx);
/* Password stretching.
*
* Password stretching functions take a low-entropy password and apply a slow
* function that results in a key suitable for use in symmetric
* cryptography. */
/* PKCS5_PBKDF2_HMAC computes |iterations| iterations of PBKDF2 of |password|
* and |salt|, using |digest|, and outputs |key_len| bytes to |out_key|. It
* returns one on success and zero on error. */
OPENSSL_EXPORT int PKCS5_PBKDF2_HMAC(const char *password, size_t password_len,
const uint8_t *salt, size_t salt_len,
unsigned iterations, const EVP_MD *digest,
size_t key_len, uint8_t *out_key);
/* PKCS5_PBKDF2_HMAC_SHA1 is the same as PKCS5_PBKDF2_HMAC, but with |digest|
* fixed to |EVP_sha1|. */
OPENSSL_EXPORT int PKCS5_PBKDF2_HMAC_SHA1(const char *password,
size_t password_len, const uint8_t *salt,
size_t salt_len, unsigned iterations,
size_t key_len, uint8_t *out_key);
/* Public key contexts.
*
* |EVP_PKEY_CTX| objects hold the context of an operation (e.g. signing or
* encrypting) that uses a public key. */
/* EVP_PKEY_CTX_new allocates a fresh |EVP_PKEY_CTX| for use with |pkey|. It
* returns the context or NULL on error. */
OPENSSL_EXPORT EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e);
/* EVP_PKEY_CTX_new_id allocates a fresh |EVP_PKEY_CTX| for a key of type |id|
* (e.g. |EVP_PKEY_HMAC|). This can be used for key generation where
* |EVP_PKEY_CTX_new| can't be used because there isn't an |EVP_PKEY| to pass
* it. It returns the context or NULL on error. */
OPENSSL_EXPORT EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e);
/* EVP_PKEY_CTX_free frees |ctx| and the data it owns. */
OPENSSL_EXPORT void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_CTX_dup allocates a fresh |EVP_PKEY_CTX| and sets it equal to the
* state of |ctx|. It returns the fresh |EVP_PKEY_CTX| or NULL on error. */
OPENSSL_EXPORT EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_CTX_get0_pkey returns the |EVP_PKEY| associated with |ctx|. */
OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_sign_init initialises an |EVP_PKEY_CTX| for a signing operation. It
* should be called before |EVP_PKEY_sign|.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_sign signs |data_len| bytes from |data| using |ctx|. If |sig| is
* NULL, the maximum size of the signature is written to
* |out_sig_len|. Otherwise, |*sig_len| must contain the number of bytes of
* space available at |sig|. If sufficient, the signature will be written to
* |sig| and |*sig_len| updated with the true length.
*
* WARNING: Setting |sig| to NULL only gives the maximum size of the
* signature. The actual signature may be smaller.
*
* It returns one on success or zero on error. (Note: this differs from
* OpenSSL, which can also return negative values to indicate an error. ) */
OPENSSL_EXPORT int EVP_PKEY_sign(EVP_PKEY_CTX *ctx, uint8_t *sig,
size_t *sig_len, const uint8_t *data,
size_t data_len);
/* EVP_PKEY_verify_init initialises an |EVP_PKEY_CTX| for a signature
* verification operation. It should be called before |EVP_PKEY_verify|.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_verify verifies that |sig_len| bytes from |sig| are a valid signature
* for |data|.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig,
size_t sig_len, const uint8_t *data,
size_t data_len);
/* EVP_PKEY_encrypt_init initialises an |EVP_PKEY_CTX| for an encryption
* operation. It should be called before |EVP_PKEY_encrypt|.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_encrypt encrypts |in_len| bytes from |in|. If |out| is NULL, the
* maximum size of the ciphertext is written to |out_len|. Otherwise, |*out_len|
* must contain the number of bytes of space available at |out|. If sufficient,
* the ciphertext will be written to |out| and |*out_len| updated with the true
* length.
*
* WARNING: Setting |out| to NULL only gives the maximum size of the
* ciphertext. The actual ciphertext may be smaller.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx, uint8_t *out,
size_t *out_len, const uint8_t *in,
size_t in_len);
/* EVP_PKEY_decrypt_init initialises an |EVP_PKEY_CTX| for a decryption
* operation. It should be called before |EVP_PKEY_decrypt|.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_decrypt decrypts |in_len| bytes from |in|. If |out| is NULL, the
* maximum size of the plaintext is written to |out_len|. Otherwise, |*out_len|
* must contain the number of bytes of space available at |out|. If sufficient,
* the ciphertext will be written to |out| and |*out_len| updated with the true
* length.
*
* WARNING: Setting |out| to NULL only gives the maximum size of the
* plaintext. The actual plaintext may be smaller.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx, uint8_t *out,
size_t *out_len, const uint8_t *in,
size_t in_len);
/* EVP_PKEY_verify_recover_init initialises an |EVP_PKEY_CTX| for a public-key
* decryption operation. It should be called before |EVP_PKEY_verify_recover|.
*
* Public-key decryption is a very obscure operation that is only implemented
* by RSA keys. It is effectively a signature verification operation that
* returns the signed message directly. It is almost certainly not what you
* want.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_verify_recover decrypts |sig_len| bytes from |sig|. If |out| is
* NULL, the maximum size of the plaintext is written to |out_len|. Otherwise,
* |*out_len| must contain the number of bytes of space available at |out|. If
* sufficient, the ciphertext will be written to |out| and |*out_len| updated
* with the true length.
*
* WARNING: Setting |out| to NULL only gives the maximum size of the
* plaintext. The actual plaintext may be smaller.
*
* See the warning about this operation in |EVP_PKEY_verify_recover_init|. It
* is probably not what you want.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx, uint8_t *out,
size_t *out_len, const uint8_t *sig,
size_t siglen);
/* EVP_PKEY_derive_init initialises an |EVP_PKEY_CTX| for a key derivation
* operation. It should be called before |EVP_PKEY_derive_set_peer| and
* |EVP_PKEY_derive|.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_derive_set_peer sets the peer's key to be used for key derivation
* by |ctx| to |peer|. It should be called after |EVP_PKEY_derive_init|. (For
* example, this is used to set the peer's key in (EC)DH.) It returns one on
* success and zero on error. */
OPENSSL_EXPORT int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer);
/* EVP_PKEY_derive derives a shared key between the two keys configured in
* |ctx|. If |key| is non-NULL then, on entry, |out_key_len| must contain the
* amount of space at |key|. If sufficient then the shared key will be written
* to |key| and |*out_key_len| will be set to the length. If |key| is NULL then
* |out_key_len| will be set to the maximum length.
*
* WARNING: Setting |out| to NULL only gives the maximum size of the key. The
* actual key may be smaller.
*
* It returns one on success and zero on error. */
OPENSSL_EXPORT int EVP_PKEY_derive(EVP_PKEY_CTX *ctx, uint8_t *key,
size_t *out_key_len);
/* EVP_PKEY_keygen_init initialises an |EVP_PKEY_CTX| for a key generation
* operation. It should be called before |EVP_PKEY_keygen|.
*
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx);
/* EVP_PKEY_keygen performs a key generation operation using the values from
* |ctx| and sets |*ppkey| to a fresh |EVP_PKEY| containing the resulting key.
* It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey);
/* Generic control functions. */
/* EVP_PKEY_CTX_set_signature_md sets |md| as the digest to be used in a
* signature operation. It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx,
const EVP_MD *md);
/* EVP_PKEY_CTX_get_signature_md sets |*out_md| to the digest to be used in a
* signature operation. It returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_get_signature_md(EVP_PKEY_CTX *ctx,
const EVP_MD **out_md);
/* RSA specific control functions. */
/* EVP_PKEY_CTX_set_rsa_padding sets the padding type to use. It should be one
* of the |RSA_*_PADDING| values. Returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_padding(EVP_PKEY_CTX *ctx, int padding);
/* EVP_PKEY_CTX_get_rsa_padding sets |*out_padding| to the current padding
* value, which is one of the |RSA_*_PADDING| values. Returns one on success or
* zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_padding(EVP_PKEY_CTX *ctx,
int *out_padding);
/* EVP_PKEY_CTX_set_rsa_pss_saltlen sets the length of the salt in a PSS-padded
* signature. A value of -1 cause the salt to be the same length as the digest
* in the signature. A value of -2 causes the salt to be the maximum length
* that will fit. Otherwise the value gives the size of the salt in bytes.
*
* Returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_pss_saltlen(EVP_PKEY_CTX *ctx,
int salt_len);
/* EVP_PKEY_CTX_get_rsa_pss_saltlen sets |*out_salt_len| to the salt length of
* a PSS-padded signature. See the documentation for
* |EVP_PKEY_CTX_set_rsa_pss_saltlen| for details of the special values that it
* can take.
*
* Returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_pss_saltlen(EVP_PKEY_CTX *ctx,
int *out_salt_len);
/* EVP_PKEY_CTX_set_rsa_keygen_bits sets the size of the desired RSA modulus,
* in bits, for key generation. Returns one on success or zero on
* error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_keygen_bits(EVP_PKEY_CTX *ctx,
int bits);
/* EVP_PKEY_CTX_set_rsa_keygen_pubexp sets |e| as the public exponent for key
* generation. Returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_keygen_pubexp(EVP_PKEY_CTX *ctx,
BIGNUM *e);
/* EVP_PKEY_CTX_set_rsa_oaep_md sets |md| as the digest used in OAEP padding.
* Returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_oaep_md(EVP_PKEY_CTX *ctx,
const EVP_MD *md);
/* EVP_PKEY_CTX_get_rsa_oaep_md sets |*out_md| to the digest function used in
* OAEP padding. Returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_oaep_md(EVP_PKEY_CTX *ctx,
const EVP_MD **out_md);
/* EVP_PKEY_CTX_set_rsa_mgf1_md sets |md| as the digest used in MGF1. Returns
* one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_mgf1_md(EVP_PKEY_CTX *ctx,
const EVP_MD *md);
/* EVP_PKEY_CTX_get_rsa_mgf1_md sets |*out_md| to the digest function used in
* MGF1. Returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_mgf1_md(EVP_PKEY_CTX *ctx,
const EVP_MD **out_md);
/* EVP_PKEY_CTX_set0_rsa_oaep_label sets |label_len| bytes from |label| as the
* label used in OAEP. DANGER: On success, this call takes ownership of |label|
* and will call |OPENSSL_free| on it when |ctx| is destroyed.
*
* Returns one on success or zero on error. */
OPENSSL_EXPORT int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx,
uint8_t *label,
size_t label_len);
/* EVP_PKEY_CTX_get0_rsa_oaep_label sets |*out_label| to point to the internal
* buffer containing the OAEP label (which may be NULL) and returns the length
* of the label or a negative value on error.
*
* WARNING: the return value differs from the usual return value convention. */
OPENSSL_EXPORT int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx,
const uint8_t **out_label);
/* Deprecated functions. */
/* EVP_PKEY_DH is defined for compatibility, but it is impossible to create an
* |EVP_PKEY| of that type. */
#define EVP_PKEY_DH NID_dhKeyAgreement
/* EVP_PKEY_RSA2 was historically an alternate form for RSA public keys (OID
* 2.5.8.1.1), but is no longer accepted. */
#define EVP_PKEY_RSA2 NID_rsa
/* OpenSSL_add_all_algorithms does nothing. */
OPENSSL_EXPORT void OpenSSL_add_all_algorithms(void);
/* OPENSSL_add_all_algorithms_conf does nothing. */
OPENSSL_EXPORT void OPENSSL_add_all_algorithms_conf(void);
/* OpenSSL_add_all_ciphers does nothing. */
OPENSSL_EXPORT void OpenSSL_add_all_ciphers(void);
/* OpenSSL_add_all_digests does nothing. */
OPENSSL_EXPORT void OpenSSL_add_all_digests(void);
/* EVP_cleanup does nothing. */
OPENSSL_EXPORT void EVP_cleanup(void);
OPENSSL_EXPORT void EVP_CIPHER_do_all_sorted(
void (*callback)(const EVP_CIPHER *cipher, const char *name,
const char *unused, void *arg),
void *arg);
OPENSSL_EXPORT void EVP_MD_do_all_sorted(void (*callback)(const EVP_MD *cipher,
const char *name,
const char *unused,
void *arg),
void *arg);
/* i2d_PrivateKey marshals a private key from |key| to an ASN.1, DER
* structure. If |outp| is not NULL then the result is written to |*outp| and
* |*outp| is advanced just past the output. It returns the number of bytes in
* the result, whether written or not, or a negative value on error.
*
* RSA keys are serialized as a DER-encoded RSAPublicKey (RFC 3447) structure.
* EC keys are serialized as a DER-encoded ECPrivateKey (RFC 5915) structure.
*
* Use |RSA_marshal_private_key| or |EC_marshal_private_key| instead. */
OPENSSL_EXPORT int i2d_PrivateKey(const EVP_PKEY *key, uint8_t **outp);
/* i2d_PublicKey marshals a public key from |key| to a type-specific format.
* If |outp| is not NULL then the result is written to |*outp| and
* |*outp| is advanced just past the output. It returns the number of bytes in
* the result, whether written or not, or a negative value on error.
*
* RSA keys are serialized as a DER-encoded RSAPublicKey (RFC 3447) structure.
* EC keys are serialized as an EC point per SEC 1.
*
* Use |RSA_marshal_public_key| or |EC_POINT_point2cbb| instead. */
OPENSSL_EXPORT int i2d_PublicKey(EVP_PKEY *key, uint8_t **outp);
/* d2i_PrivateKey parses an ASN.1, DER-encoded, private key from |len| bytes at
* |*inp|. If |out| is not NULL then, on exit, a pointer to the result is in
* |*out|. Note that, even if |*out| is already non-NULL on entry, it will not
* be written to. Rather, a fresh |EVP_PKEY| is allocated and the previous one
* is freed. On successful exit, |*inp| is advanced past the DER structure. It
* returns the result or NULL on error.
*
* This function tries to detect one of several formats. Instead, use
* |EVP_parse_private_key| for a PrivateKeyInfo, |RSA_parse_private_key| for an
* RSAPrivateKey, and |EC_parse_private_key| for an ECPrivateKey. */
OPENSSL_EXPORT EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **out,
const uint8_t **inp, long len);
/* d2i_AutoPrivateKey acts the same as |d2i_PrivateKey|, but detects the type
* of the private key.
*
* This function tries to detect one of several formats. Instead, use
* |EVP_parse_private_key| for a PrivateKeyInfo, |RSA_parse_private_key| for an
* RSAPrivateKey, and |EC_parse_private_key| for an ECPrivateKey. */
OPENSSL_EXPORT EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **out, const uint8_t **inp,
long len);
/* Private structures. */
struct evp_pkey_st {
CRYPTO_refcount_t references;
/* type contains one of the EVP_PKEY_* values or NID_undef and determines
* which element (if any) of the |pkey| union is valid. */
int type;
union {
char *ptr;
RSA *rsa;
DSA *dsa;
DH *dh;
EC_KEY *ec;
} pkey;
/* ameth contains a pointer to a method table that contains many ASN.1
* methods for the key type. */
const EVP_PKEY_ASN1_METHOD *ameth;
} /* EVP_PKEY */;
#if defined(__cplusplus)
} /* extern C */
#endif
#define EVP_R_BUFFER_TOO_SMALL 100
#define EVP_R_COMMAND_NOT_SUPPORTED 101
#define EVP_R_DECODE_ERROR 102
#define EVP_R_DIFFERENT_KEY_TYPES 103
#define EVP_R_DIFFERENT_PARAMETERS 104
#define EVP_R_ENCODE_ERROR 105
#define EVP_R_EXPECTING_AN_EC_KEY_KEY 106
#define EVP_R_EXPECTING_AN_RSA_KEY 107
#define EVP_R_EXPECTING_A_DSA_KEY 108
#define EVP_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE 109
#define EVP_R_INVALID_DIGEST_LENGTH 110
#define EVP_R_INVALID_DIGEST_TYPE 111
#define EVP_R_INVALID_KEYBITS 112
#define EVP_R_INVALID_MGF1_MD 113
#define EVP_R_INVALID_OPERATION 114
#define EVP_R_INVALID_PADDING_MODE 115
#define EVP_R_INVALID_PSS_SALTLEN 116
#define EVP_R_KEYS_NOT_SET 117
#define EVP_R_MISSING_PARAMETERS 118
#define EVP_R_NO_DEFAULT_DIGEST 119
#define EVP_R_NO_KEY_SET 120
#define EVP_R_NO_MDC2_SUPPORT 121
#define EVP_R_NO_NID_FOR_CURVE 122
#define EVP_R_NO_OPERATION_SET 123
#define EVP_R_NO_PARAMETERS_SET 124
#define EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE 125
#define EVP_R_OPERATON_NOT_INITIALIZED 126
#define EVP_R_UNKNOWN_PUBLIC_KEY_TYPE 127
#define EVP_R_UNSUPPORTED_ALGORITHM 128
#define EVP_R_UNSUPPORTED_PUBLIC_KEY_TYPE 129
#endif /* OPENSSL_HEADER_EVP_H */
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