gnunet-android

evp.h (48495B)

---

 // Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #ifndef OPENSSL_HEADER_EVP_H
 #define OPENSSL_HEADER_EVP_H
 
 #include <openssl/base.h>   // IWYU pragma: export
 
 #include <openssl/evp_errors.h>  // IWYU pragma: export
 
 // 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.
 //
 // An |EVP_PKEY| object represents a public or private key. A given object may
 // be used concurrently on multiple threads by non-mutating functions, provided
 // no other thread is concurrently calling a mutating function. Unless otherwise
 // documented, functions which take a |const| pointer are non-mutating and
 // functions which take a non-|const| pointer are mutating.
 
 // 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. It
 // does not mutate |pkey| for thread-safety purposes and may be used
 // concurrently.
 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_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(const 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);
 
 
 // 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 if |key| is NULL. The
 // |assign| functions adopt the caller's reference and return one on success or
 // zero if |key| is NULL. 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.
 //
 // The |get0| and |get1| functions take |const| pointers and are thus
 // non-mutating for thread-safety purposes, but mutating functions on the
 // returned lower-level objects are considered to also mutate the |EVP_PKEY| and
 // may not be called concurrently with other operations on the |EVP_PKEY|.
 
 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(const EVP_PKEY *pkey);
 OPENSSL_EXPORT RSA *EVP_PKEY_get1_RSA(const 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(const EVP_PKEY *pkey);
 OPENSSL_EXPORT DSA *EVP_PKEY_get1_DSA(const 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(const EVP_PKEY *pkey);
 OPENSSL_EXPORT EC_KEY *EVP_PKEY_get1_EC_KEY(const EVP_PKEY *pkey);
 
 OPENSSL_EXPORT int EVP_PKEY_set1_DH(EVP_PKEY *pkey, DH *key);
 OPENSSL_EXPORT int EVP_PKEY_assign_DH(EVP_PKEY *pkey, DH *key);
 OPENSSL_EXPORT DH *EVP_PKEY_get0_DH(const EVP_PKEY *pkey);
 OPENSSL_EXPORT DH *EVP_PKEY_get1_DH(const EVP_PKEY *pkey);
 
 #define EVP_PKEY_NONE NID_undef
 #define EVP_PKEY_RSA NID_rsaEncryption
 #define EVP_PKEY_RSA_PSS NID_rsassaPss
 #define EVP_PKEY_DSA NID_dsa
 #define EVP_PKEY_EC NID_X9_62_id_ecPublicKey
 #define EVP_PKEY_ED25519 NID_ED25519
 #define EVP_PKEY_X25519 NID_X25519
 #define EVP_PKEY_HKDF NID_hkdf
 #define EVP_PKEY_DH NID_dhKeyAgreement
 
 // EVP_PKEY_set_type sets the type of |pkey| to |type|. It returns one if
 // successful or zero if the |type| argument is not one of the |EVP_PKEY_*|
 // values. 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. If the key is an EC key, the curve is guaranteed
 // to be set.
 //
 // 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. In particular, RSA private key operations scale cubicly, so
 // applications accepting RSA private keys from external sources may need to
 // bound key sizes (use |EVP_PKEY_bits| or |RSA_bits|) to avoid a DoS vector.
 //
 // 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);
 
 
 // Raw keys
 //
 // Some keys types support a "raw" serialization. Currently the only supported
 // raw formats are X25519 and Ed25519, where the formats are those specified in
 // RFC 7748 and RFC 8032, respectively. Note the RFC 8032 private key format is
 // the 32-byte prefix of |ED25519_sign|'s 64-byte private key.
 
 // EVP_PKEY_new_raw_private_key returns a newly allocated |EVP_PKEY| wrapping a
 // private key of the specified type. It returns one on success and zero on
 // error.
 OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_new_raw_private_key(int type, ENGINE *unused,
                                                       const uint8_t *in,
                                                       size_t len);
 
 // EVP_PKEY_new_raw_public_key returns a newly allocated |EVP_PKEY| wrapping a
 // public key of the specified type. It returns one on success and zero on
 // error.
 OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_new_raw_public_key(int type, ENGINE *unused,
                                                      const uint8_t *in,
                                                      size_t len);
 
 // EVP_PKEY_get_raw_private_key outputs the private key for |pkey| in raw form.
 // If |out| is NULL, it sets |*out_len| to the size of the raw private key.
 // Otherwise, it writes at most |*out_len| bytes to |out| and sets |*out_len| to
 // the number of bytes written.
 //
 // It returns one on success and zero if |pkey| has no private key, the key
 // type does not support a raw format, or the buffer is too small.
 OPENSSL_EXPORT int EVP_PKEY_get_raw_private_key(const EVP_PKEY *pkey,
                                                 uint8_t *out, size_t *out_len);
 
 // EVP_PKEY_get_raw_public_key outputs the public key for |pkey| in raw form.
 // If |out| is NULL, it sets |*out_len| to the size of the raw public key.
 // Otherwise, it writes at most |*out_len| bytes to |out| and sets |*out_len| to
 // the number of bytes written.
 //
 // It returns one on success and zero if |pkey| has no public key, the key
 // type does not support a raw format, or the buffer is too small.
 OPENSSL_EXPORT int EVP_PKEY_get_raw_public_key(const EVP_PKEY *pkey,
                                                uint8_t *out, size_t *out_len);
 
 
 // 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.
 //
 // For single-shot signing algorithms which do not use a pre-hash, such as
 // Ed25519, |type| should be NULL. The |EVP_MD_CTX| itself is unused but is
 // present so the API is uniform. See |EVP_DigestSign|.
 //
 // This function does not mutate |pkey| for thread-safety purposes and may be
 // used concurrently with other non-mutating functions on |pkey|.
 //
 // 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.
 //
 // This function performs a streaming signing operation and will fail for
 // signature algorithms which do not support this. Use |EVP_DigestSign| for a
 // single-shot operation.
 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.
 //
 // This function performs a streaming signing operation and will fail for
 // signature algorithms which do not support this. Use |EVP_DigestSign| for a
 // single-shot operation.
 //
 // 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);
 
 // EVP_DigestSign signs |data_len| bytes from |data| using |ctx|. 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 and zero on error.
 OPENSSL_EXPORT int EVP_DigestSign(EVP_MD_CTX *ctx, uint8_t *out_sig,
                                   size_t *out_sig_len, const uint8_t *data,
                                   size_t data_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.
 //
 // For single-shot signing algorithms which do not use a pre-hash, such as
 // Ed25519, |type| should be NULL. The |EVP_MD_CTX| itself is unused but is
 // present so the API is uniform. See |EVP_DigestVerify|.
 //
 // This function does not mutate |pkey| for thread-safety purposes and may be
 // used concurrently with other non-mutating functions on |pkey|.
 //
 // 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.
 //
 // This function performs streaming signature verification and will fail for
 // signature algorithms which do not support this. Use |EVP_DigestVerify| for a
 // single-shot verification.
 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.
 //
 // This function performs streaming signature verification and will fail for
 // signature algorithms which do not support this. Use |EVP_DigestVerify| for a
 // single-shot verification.
 OPENSSL_EXPORT int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig,
                                          size_t sig_len);
 
 // EVP_DigestVerify 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_DigestVerify(EVP_MD_CTX *ctx, const uint8_t *sig,
                                     size_t sig_len, const uint8_t *data,
                                     size_t 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. It also does not mutate |pkey| for
 // thread-safety purposes and may be used concurrently with other non-mutating
 // functions on |pkey|.
 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 verify a longer message. It also does not mutate |pkey| for
 // thread-safety purposes and may be used concurrently with other non-mutating
 // functions on |pkey|.
 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 allocation failure or if iterations is 0.
 OPENSSL_EXPORT int PKCS5_PBKDF2_HMAC(const char *password, size_t password_len,
                                      const uint8_t *salt, size_t salt_len,
                                      uint32_t 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,
                                           uint32_t iterations, size_t key_len,
                                           uint8_t *out_key);
 
 // EVP_PBE_scrypt expands |password| into a secret key of length |key_len| using
 // scrypt, as described in RFC 7914, and writes the result to |out_key|. It
 // returns one on success and zero on allocation failure, if the memory required
 // for the operation exceeds |max_mem|, or if any of the parameters are invalid
 // as described below.
 //
 // |N|, |r|, and |p| are as described in RFC 7914 section 6. They determine the
 // cost of the operation. If |max_mem| is zero, a default limit of 32MiB will be
 // used.
 //
 // The parameters are considered invalid under any of the following conditions:
 // - |r| or |p| are zero
 // - |p| > (2^30 - 1) / |r|
 // - |N| is not a power of two
 // - |N| > 2^32
 // - |N| > 2^(128 * |r| / 8)
 OPENSSL_EXPORT int EVP_PBE_scrypt(const char *password, size_t password_len,
                                   const uint8_t *salt, size_t salt_len,
                                   uint64_t N, uint64_t r, uint64_t p,
                                   size_t max_mem, uint8_t *out_key,
                                   size_t key_len);
 
 
 // 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 |digest_len| bytes from |digest| 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. This function will fail for signature
 // algorithms like Ed25519 that do not support signing pre-hashed inputs.
 //
 // WARNING: |digest| must be the output of some hash function on the data to be
 // signed. Passing unhashed inputs will not result in a secure signature scheme.
 // Use |EVP_DigestSignInit| to sign an unhashed input.
 //
 // 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 *digest,
                                  size_t digest_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 |digest|. This function will fail for signature
 // algorithms like Ed25519 that do not support signing pre-hashed inputs.
 //
 // WARNING: |digest| must be the output of some hash function on the data to be
 // verified. Passing unhashed inputs will not result in a secure signature
 // scheme. Use |EVP_DigestVerifyInit| to verify a signature given the unhashed
 // input.
 //
 // 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 *digest,
                                    size_t digest_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 from |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|. If |*out_pkey| is non-NULL, it overwrites |*out_pkey| with the
 // resulting key. Otherwise, it sets |*out_pkey| to a newly-allocated |EVP_PKEY|
 // containing the result. It returns one on success or zero on error.
 OPENSSL_EXPORT int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **out_pkey);
 
 // EVP_PKEY_paramgen_init initialises an |EVP_PKEY_CTX| for a parameter
 // generation operation. It should be called before |EVP_PKEY_paramgen|.
 //
 // It returns one on success or zero on error.
 OPENSSL_EXPORT int EVP_PKEY_paramgen_init(EVP_PKEY_CTX *ctx);
 
 // EVP_PKEY_paramgen performs a parameter generation using the values from
 // |ctx|. If |*out_pkey| is non-NULL, it overwrites |*out_pkey| with the
 // resulting parameters, but no key. Otherwise, it sets |*out_pkey| to a
 // newly-allocated |EVP_PKEY| containing the result. It returns one on success
 // or zero on error.
 OPENSSL_EXPORT int EVP_PKEY_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY **out_pkey);
 
 
 // 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. By
 // default, the padding is |RSA_PKCS1_PADDING|.
 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 when signing and recovered from the signature when verifying.
 // Otherwise the value gives the size of the salt in bytes.
 //
 // If unsure, use -1.
 //
 // Returns one on success or zero on error.
 //
 // TODO(davidben): The default is currently -2. Switch it to -1.
 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. If unset, the default is SHA-1.
 // Callers are recommended to overwrite this default.
 //
 // TODO(davidben): Remove the default and require callers specify this.
 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.
 //
 // If unset, the default is the signing hash for |RSA_PKCS1_PSS_PADDING| and the
 // OAEP hash for |RSA_PKCS1_OAEP_PADDING|. Callers are recommended to use this
 // default and not call this function.
 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);
 
 
 // EC specific control functions.
 
 // EVP_PKEY_CTX_set_ec_paramgen_curve_nid sets the curve used for
 // |EVP_PKEY_keygen| or |EVP_PKEY_paramgen| operations to |nid|. It returns one
 // on success and zero on error.
 OPENSSL_EXPORT int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx,
                                                           int nid);
 
 
 // Diffie-Hellman-specific control functions.
 
 // EVP_PKEY_CTX_set_dh_pad configures configures whether |ctx|, which must be an
 // |EVP_PKEY_derive| operation, configures the handling of leading zeros in the
 // Diffie-Hellman shared secret. If |pad| is zero, leading zeros are removed
 // from the secret. If |pad| is non-zero, the fixed-width shared secret is used
 // unmodified, as in PKCS #3. If this function is not called, the default is to
 // remove leading zeros.
 //
 // WARNING: The behavior when |pad| is zero leaks information about the shared
 // secret. This may result in side channel attacks such as
 // https://raccoon-attack.com/, particularly when the same private key is used
 // for multiple operations.
 OPENSSL_EXPORT int EVP_PKEY_CTX_set_dh_pad(EVP_PKEY_CTX *ctx, int pad);
 
 
 // Deprecated functions.
 
 // 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
 
 // EVP_PKEY_X448 is defined for OpenSSL compatibility, but we do not support
 // X448 and attempts to create keys will fail.
 #define EVP_PKEY_X448 NID_X448
 
 // EVP_PKEY_ED448 is defined for OpenSSL compatibility, but we do not support
 // Ed448 and attempts to create keys will fail.
 #define EVP_PKEY_ED448 NID_ED448
 
 // EVP_PKEY_get0 returns NULL. This function is provided for compatibility with
 // OpenSSL but does not return anything. Use the typed |EVP_PKEY_get0_*|
 // functions instead.
 OPENSSL_EXPORT void *EVP_PKEY_get0(const EVP_PKEY *pkey);
 
 // 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);
 
 OPENSSL_EXPORT void EVP_MD_do_all(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 type-specific format, as
 // described in |i2d_SAMPLE|.
 //
 // RSA keys are serialized as a DER-encoded RSAPublicKey (RFC 8017) structure.
 // EC keys are serialized as a DER-encoded ECPrivateKey (RFC 5915) structure.
 //
 // Use |RSA_marshal_private_key| or |EC_KEY_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, as
 // described in |i2d_SAMPLE|.
 //
 // RSA keys are serialized as a DER-encoded RSAPublicKey (RFC 8017) 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(const EVP_PKEY *key, uint8_t **outp);
 
 // d2i_PrivateKey parses a DER-encoded private key from |len| bytes at |*inp|,
 // as described in |d2i_SAMPLE|. The private key must have type |type|,
 // otherwise it will be rejected.
 //
 // 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);
 
 // d2i_PublicKey parses a public key from |len| bytes at |*inp| in a type-
 // specific format specified by |type|, as described in |d2i_SAMPLE|.
 //
 // The only supported value for |type| is |EVP_PKEY_RSA|, which parses a
 // DER-encoded RSAPublicKey (RFC 8017) structure. Parsing EC keys is not
 // supported by this function.
 //
 // Use |RSA_parse_public_key| instead.
 OPENSSL_EXPORT EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **out,
                                        const uint8_t **inp, long len);
 
 // EVP_PKEY_CTX_set_ec_param_enc returns one if |encoding| is
 // |OPENSSL_EC_NAMED_CURVE| or zero with an error otherwise.
 OPENSSL_EXPORT int EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX *ctx,
                                                  int encoding);
 
 // EVP_PKEY_set1_tls_encodedpoint replaces |pkey| with a public key encoded by
 // |in|. It returns one on success and zero on error.
 //
 // If |pkey| is an EC key, the format is an X9.62 point and |pkey| must already
 // have an EC group configured. If it is an X25519 key, it is the 32-byte X25519
 // public key representation. This function is not supported for other key types
 // and will fail.
 OPENSSL_EXPORT int EVP_PKEY_set1_tls_encodedpoint(EVP_PKEY *pkey,
                                                   const uint8_t *in,
                                                   size_t len);
 
 // EVP_PKEY_get1_tls_encodedpoint sets |*out_ptr| to a newly-allocated buffer
 // containing the raw encoded public key for |pkey|. The caller must call
 // |OPENSSL_free| to release this buffer. The function returns the length of the
 // buffer on success and zero on error.
 //
 // If |pkey| is an EC key, the format is an X9.62 point with uncompressed
 // coordinates. If it is an X25519 key, it is the 32-byte X25519 public key
 // representation. This function is not supported for other key types and will
 // fail.
 OPENSSL_EXPORT size_t EVP_PKEY_get1_tls_encodedpoint(const EVP_PKEY *pkey,
                                                      uint8_t **out_ptr);
 
 // EVP_PKEY_base_id calls |EVP_PKEY_id|.
 OPENSSL_EXPORT int EVP_PKEY_base_id(const EVP_PKEY *pkey);
 
 // EVP_PKEY_CTX_set_rsa_pss_keygen_md returns 0.
 OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_pss_keygen_md(EVP_PKEY_CTX *ctx,
                                                       const EVP_MD *md);
 
 // EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen returns 0.
 OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(EVP_PKEY_CTX *ctx,
                                                            int salt_len);
 
 // EVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md returns 0.
 OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md(EVP_PKEY_CTX *ctx,
                                                            const EVP_MD *md);
 
 // i2d_PUBKEY marshals |pkey| as a DER-encoded SubjectPublicKeyInfo, as
 // described in |i2d_SAMPLE|.
 //
 // Use |EVP_marshal_public_key| instead.
 OPENSSL_EXPORT int i2d_PUBKEY(const EVP_PKEY *pkey, uint8_t **outp);
 
 // d2i_PUBKEY parses a DER-encoded SubjectPublicKeyInfo from |len| bytes at
 // |*inp|, as described in |d2i_SAMPLE|.
 //
 // Use |EVP_parse_public_key| instead.
 OPENSSL_EXPORT EVP_PKEY *d2i_PUBKEY(EVP_PKEY **out, const uint8_t **inp,
                                     long len);
 
 // i2d_RSA_PUBKEY marshals |rsa| as a DER-encoded SubjectPublicKeyInfo
 // structure, as described in |i2d_SAMPLE|.
 //
 // Use |EVP_marshal_public_key| instead.
 OPENSSL_EXPORT int i2d_RSA_PUBKEY(const RSA *rsa, uint8_t **outp);
 
 // d2i_RSA_PUBKEY parses an RSA public key as a DER-encoded SubjectPublicKeyInfo
 // from |len| bytes at |*inp|, as described in |d2i_SAMPLE|.
 // SubjectPublicKeyInfo structures containing other key types are rejected.
 //
 // Use |EVP_parse_public_key| instead.
 OPENSSL_EXPORT RSA *d2i_RSA_PUBKEY(RSA **out, const uint8_t **inp, long len);
 
 // i2d_DSA_PUBKEY marshals |dsa| as a DER-encoded SubjectPublicKeyInfo, as
 // described in |i2d_SAMPLE|.
 //
 // Use |EVP_marshal_public_key| instead.
 OPENSSL_EXPORT int i2d_DSA_PUBKEY(const DSA *dsa, uint8_t **outp);
 
 // d2i_DSA_PUBKEY parses a DSA public key as a DER-encoded SubjectPublicKeyInfo
 // from |len| bytes at |*inp|, as described in |d2i_SAMPLE|.
 // SubjectPublicKeyInfo structures containing other key types are rejected.
 //
 // Use |EVP_parse_public_key| instead.
 OPENSSL_EXPORT DSA *d2i_DSA_PUBKEY(DSA **out, const uint8_t **inp, long len);
 
 // i2d_EC_PUBKEY marshals |ec_key| as a DER-encoded SubjectPublicKeyInfo, as
 // described in |i2d_SAMPLE|.
 //
 // Use |EVP_marshal_public_key| instead.
 OPENSSL_EXPORT int i2d_EC_PUBKEY(const EC_KEY *ec_key, uint8_t **outp);
 
 // d2i_EC_PUBKEY parses an EC public key as a DER-encoded SubjectPublicKeyInfo
 // from |len| bytes at |*inp|, as described in |d2i_SAMPLE|.
 // SubjectPublicKeyInfo structures containing other key types are rejected.
 //
 // Use |EVP_parse_public_key| instead.
 OPENSSL_EXPORT EC_KEY *d2i_EC_PUBKEY(EC_KEY **out, const uint8_t **inp,
                                      long len);
 
 // EVP_PKEY_CTX_set_dsa_paramgen_bits returns zero.
 OPENSSL_EXPORT int EVP_PKEY_CTX_set_dsa_paramgen_bits(EVP_PKEY_CTX *ctx,
                                                       int nbits);
 
 // EVP_PKEY_CTX_set_dsa_paramgen_q_bits returns zero.
 OPENSSL_EXPORT int EVP_PKEY_CTX_set_dsa_paramgen_q_bits(EVP_PKEY_CTX *ctx,
                                                         int qbits);
 
 // EVP_PKEY_assign sets the underlying key of |pkey| to |key|, which must be of
 // the given type. If successful, it returns one. If the |type| argument
 // is not one of |EVP_PKEY_RSA|, |EVP_PKEY_DSA|, or |EVP_PKEY_EC| values or if
 // |key| is NULL, it returns zero. This function may not be used with other
 // |EVP_PKEY_*| types.
 //
 // Use the |EVP_PKEY_assign_*| functions instead.
 OPENSSL_EXPORT int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key);
 
 // EVP_PKEY_type returns |nid|.
 OPENSSL_EXPORT int EVP_PKEY_type(int nid);
 
 
 // Preprocessor compatibility section (hidden).
 //
 // Historically, a number of APIs were implemented in OpenSSL as macros and
 // constants to 'ctrl' functions. To avoid breaking #ifdefs in consumers, this
 // section defines a number of legacy macros.
 
 // |BORINGSSL_PREFIX| already makes each of these symbols into macros, so there
 // is no need to define conflicting macros.
 #if !defined(BORINGSSL_PREFIX)
 #define EVP_PKEY_CTX_set_rsa_oaep_md EVP_PKEY_CTX_set_rsa_oaep_md
 #define EVP_PKEY_CTX_set0_rsa_oaep_label EVP_PKEY_CTX_set0_rsa_oaep_label
 #endif
 
 
 // Nodejs compatibility section (hidden).
 //
 // These defines exist for node.js, with the hope that we can eliminate the
 // need for them over time.
 
 #define EVPerr(function, reason) \
   ERR_put_error(ERR_LIB_EVP, 0, reason, __FILE__, __LINE__)
 
 
 #if defined(__cplusplus)
 }  // extern C
 
 extern "C++" {
 BSSL_NAMESPACE_BEGIN
 
 BORINGSSL_MAKE_DELETER(EVP_PKEY, EVP_PKEY_free)
 BORINGSSL_MAKE_UP_REF(EVP_PKEY, EVP_PKEY_up_ref)
 BORINGSSL_MAKE_DELETER(EVP_PKEY_CTX, EVP_PKEY_CTX_free)
 
 BSSL_NAMESPACE_END
 
 }  // extern C++
 
 #endif
 
 #endif  // OPENSSL_HEADER_EVP_H