--- /dev/null
+/* 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_RSA_H
+#define OPENSSL_HEADER_RSA_H
+
+#include <openssl/base.h>
+
+#include <openssl/engine.h>
+#include <openssl/ex_data.h>
+#include <openssl/thread.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+// rsa.h contains functions for handling encryption and signature using RSA.
+
+
+// Allocation and destruction.
+
+// RSA_new returns a new, empty RSA object or NULL on error.
+OPENSSL_EXPORT RSA *RSA_new(void);
+
+// RSA_new_method acts the same as |RSA_new| but takes an explicit |ENGINE|.
+OPENSSL_EXPORT RSA *RSA_new_method(const ENGINE *engine);
+
+// RSA_free decrements the reference count of |rsa| and frees it if the
+// reference count drops to zero.
+OPENSSL_EXPORT void RSA_free(RSA *rsa);
+
+// RSA_up_ref increments the reference count of |rsa| and returns one.
+OPENSSL_EXPORT int RSA_up_ref(RSA *rsa);
+
+
+// Properties.
+
+// RSA_bits returns the size of |rsa|, in bits.
+OPENSSL_EXPORT unsigned RSA_bits(const RSA *rsa);
+
+// RSA_get0_key sets |*out_n|, |*out_e|, and |*out_d|, if non-NULL, to |rsa|'s
+// modulus, public exponent, and private exponent, respectively. If |rsa| is a
+// public key, the private exponent will be set to NULL.
+OPENSSL_EXPORT void RSA_get0_key(const RSA *rsa, const BIGNUM **out_n,
+ const BIGNUM **out_e, const BIGNUM **out_d);
+
+// RSA_get0_factors sets |*out_p| and |*out_q|, if non-NULL, to |rsa|'s prime
+// factors. If |rsa| is a public key, they will be set to NULL.
+OPENSSL_EXPORT void RSA_get0_factors(const RSA *rsa, const BIGNUM **out_p,
+ const BIGNUM **out_q);
+
+// RSA_get0_crt_params sets |*out_dmp1|, |*out_dmq1|, and |*out_iqmp|, if
+// non-NULL, to |rsa|'s CRT parameters. These are d (mod p-1), d (mod q-1) and
+// q^-1 (mod p), respectively. If |rsa| is a public key, each parameter will be
+// set to NULL.
+OPENSSL_EXPORT void RSA_get0_crt_params(const RSA *rsa, const BIGNUM **out_dmp1,
+ const BIGNUM **out_dmq1,
+ const BIGNUM **out_iqmp);
+
+// RSA_set0_key sets |rsa|'s modulus, public exponent, and private exponent to
+// |n|, |e|, and |d| respectively, if non-NULL. On success, it takes ownership
+// of each argument and returns one. Otherwise, it returns zero.
+//
+// |d| may be NULL, but |n| and |e| must either be non-NULL or already
+// configured on |rsa|.
+//
+// It is an error to call this function after |rsa| has been used for a
+// cryptographic operation. Construct a new |RSA| object instead.
+OPENSSL_EXPORT int RSA_set0_key(RSA *rsa, BIGNUM *n, BIGNUM *e, BIGNUM *d);
+
+// RSA_set0_factors sets |rsa|'s prime factors to |p| and |q|, if non-NULL, and
+// takes ownership of them. On success, it takes ownership of each argument and
+// returns one. Otherwise, it returns zero.
+//
+// Each argument must either be non-NULL or already configured on |rsa|.
+//
+// It is an error to call this function after |rsa| has been used for a
+// cryptographic operation. Construct a new |RSA| object instead.
+OPENSSL_EXPORT int RSA_set0_factors(RSA *rsa, BIGNUM *p, BIGNUM *q);
+
+// RSA_set0_crt_params sets |rsa|'s CRT parameters to |dmp1|, |dmq1|, and
+// |iqmp|, if non-NULL, and takes ownership of them. On success, it takes
+// ownership of its parameters and returns one. Otherwise, it returns zero.
+//
+// Each argument must either be non-NULL or already configured on |rsa|.
+//
+// It is an error to call this function after |rsa| has been used for a
+// cryptographic operation. Construct a new |RSA| object instead.
+OPENSSL_EXPORT int RSA_set0_crt_params(RSA *rsa, BIGNUM *dmp1, BIGNUM *dmq1,
+ BIGNUM *iqmp);
+
+
+// Key generation.
+
+// RSA_generate_key_ex generates a new RSA key where the modulus has size
+// |bits| and the public exponent is |e|. If unsure, |RSA_F4| is a good value
+// for |e|. If |cb| is not NULL then it is called during the key generation
+// process. In addition to the calls documented for |BN_generate_prime_ex|, it
+// is called with event=2 when the n'th prime is rejected as unsuitable and
+// with event=3 when a suitable value for |p| is found.
+//
+// It returns one on success or zero on error.
+OPENSSL_EXPORT int RSA_generate_key_ex(RSA *rsa, int bits, BIGNUM *e,
+ BN_GENCB *cb);
+
+// RSA_generate_key_fips behaves like |RSA_generate_key_ex| but performs
+// additional checks for FIPS compliance. The public exponent is always 65537
+// and |bits| must be either 2048 or 3072.
+OPENSSL_EXPORT int RSA_generate_key_fips(RSA *rsa, int bits, BN_GENCB *cb);
+
+
+// Encryption / Decryption
+
+// Padding types for encryption.
+#define RSA_PKCS1_PADDING 1
+#define RSA_NO_PADDING 3
+#define RSA_PKCS1_OAEP_PADDING 4
+// RSA_PKCS1_PSS_PADDING can only be used via the EVP interface.
+#define RSA_PKCS1_PSS_PADDING 6
+
+// RSA_encrypt encrypts |in_len| bytes from |in| to the public key from |rsa|
+// and writes, at most, |max_out| bytes of encrypted data to |out|. The
+// |max_out| argument must be, at least, |RSA_size| in order to ensure success.
+//
+// It returns 1 on success or zero on error.
+//
+// The |padding| argument must be one of the |RSA_*_PADDING| values. If in
+// doubt, use |RSA_PKCS1_OAEP_PADDING| for new protocols but
+// |RSA_PKCS1_PADDING| is most common.
+OPENSSL_EXPORT int RSA_encrypt(RSA *rsa, size_t *out_len, uint8_t *out,
+ size_t max_out, const uint8_t *in, size_t in_len,
+ int padding);
+
+// RSA_decrypt decrypts |in_len| bytes from |in| with the private key from
+// |rsa| and writes, at most, |max_out| bytes of plaintext to |out|. The
+// |max_out| argument must be, at least, |RSA_size| in order to ensure success.
+//
+// It returns 1 on success or zero on error.
+//
+// The |padding| argument must be one of the |RSA_*_PADDING| values. If in
+// doubt, use |RSA_PKCS1_OAEP_PADDING| for new protocols.
+//
+// Passing |RSA_PKCS1_PADDING| into this function is deprecated and insecure. If
+// implementing a protocol using RSAES-PKCS1-V1_5, use |RSA_NO_PADDING| and then
+// check padding in constant-time combined with a swap to a random session key
+// or other mitigation. See "Chosen Ciphertext Attacks Against Protocols Based
+// on the RSA Encryption Standard PKCS #1", Daniel Bleichenbacher, Advances in
+// Cryptology (Crypto '98).
+OPENSSL_EXPORT int RSA_decrypt(RSA *rsa, size_t *out_len, uint8_t *out,
+ size_t max_out, const uint8_t *in, size_t in_len,
+ int padding);
+
+// RSA_public_encrypt encrypts |flen| bytes from |from| to the public key in
+// |rsa| and writes the encrypted data to |to|. The |to| buffer must have at
+// least |RSA_size| bytes of space. It returns the number of bytes written, or
+// -1 on error. The |padding| argument must be one of the |RSA_*_PADDING|
+// values. If in doubt, use |RSA_PKCS1_OAEP_PADDING| for new protocols but
+// |RSA_PKCS1_PADDING| is most common.
+//
+// WARNING: this function is dangerous because it breaks the usual return value
+// convention. Use |RSA_encrypt| instead.
+OPENSSL_EXPORT int RSA_public_encrypt(size_t flen, const uint8_t *from,
+ uint8_t *to, RSA *rsa, int padding);
+
+// RSA_private_decrypt decrypts |flen| bytes from |from| with the public key in
+// |rsa| and writes the plaintext to |to|. The |to| buffer must have at least
+// |RSA_size| bytes of space. It returns the number of bytes written, or -1 on
+// error. The |padding| argument must be one of the |RSA_*_PADDING| values. If
+// in doubt, use |RSA_PKCS1_OAEP_PADDING| for new protocols. Passing
+// |RSA_PKCS1_PADDING| into this function is deprecated and insecure. See
+// |RSA_decrypt|.
+//
+// WARNING: this function is dangerous because it breaks the usual return value
+// convention. Use |RSA_decrypt| instead.
+OPENSSL_EXPORT int RSA_private_decrypt(size_t flen, const uint8_t *from,
+ uint8_t *to, RSA *rsa, int padding);
+
+
+// Signing / Verification
+
+// RSA_sign signs |in_len| bytes of digest from |in| with |rsa| using
+// RSASSA-PKCS1-v1_5. It writes, at most, |RSA_size(rsa)| bytes to |out|. On
+// successful return, the actual number of bytes written is written to
+// |*out_len|.
+//
+// The |hash_nid| argument identifies the hash function used to calculate |in|
+// and is embedded in the resulting signature. For example, it might be
+// |NID_sha256|.
+//
+// It returns 1 on success and zero on error.
+OPENSSL_EXPORT int RSA_sign(int hash_nid, const uint8_t *in,
+ unsigned int in_len, uint8_t *out,
+ unsigned int *out_len, RSA *rsa);
+
+// RSA_sign_pss_mgf1 signs |in_len| bytes from |in| with the public key from
+// |rsa| using RSASSA-PSS with MGF1 as the mask generation function. It writes,
+// at most, |max_out| bytes of signature data to |out|. The |max_out| argument
+// must be, at least, |RSA_size| in order to ensure success. It returns 1 on
+// success or zero on error.
+//
+// The |md| and |mgf1_md| arguments identify the hash used to calculate |msg|
+// and the MGF1 hash, respectively. If |mgf1_md| is NULL, |md| is
+// used.
+//
+// |salt_len| specifies the expected salt length in bytes. If |salt_len| is -1,
+// then the salt length is the same as the hash length. If -2, then the salt
+// length is maximal given the size of |rsa|. If unsure, use -1.
+OPENSSL_EXPORT int RSA_sign_pss_mgf1(RSA *rsa, size_t *out_len, uint8_t *out,
+ size_t max_out, const uint8_t *in,
+ size_t in_len, const EVP_MD *md,
+ const EVP_MD *mgf1_md, int salt_len);
+
+// RSA_sign_raw signs |in_len| bytes from |in| with the public key from |rsa|
+// and writes, at most, |max_out| bytes of signature data to |out|. The
+// |max_out| argument must be, at least, |RSA_size| in order to ensure success.
+//
+// It returns 1 on success or zero on error.
+//
+// The |padding| argument must be one of the |RSA_*_PADDING| values. If in
+// doubt, |RSA_PKCS1_PADDING| is the most common but |RSA_PKCS1_PSS_PADDING|
+// (via the |EVP_PKEY| interface) is preferred for new protocols.
+OPENSSL_EXPORT int RSA_sign_raw(RSA *rsa, size_t *out_len, uint8_t *out,
+ size_t max_out, const uint8_t *in,
+ size_t in_len, int padding);
+
+// RSA_verify verifies that |sig_len| bytes from |sig| are a valid,
+// RSASSA-PKCS1-v1_5 signature of |msg_len| bytes at |msg| by |rsa|.
+//
+// The |hash_nid| argument identifies the hash function used to calculate |msg|
+// and is embedded in the resulting signature in order to prevent hash
+// confusion attacks. For example, it might be |NID_sha256|.
+//
+// It returns one if the signature is valid and zero otherwise.
+//
+// WARNING: this differs from the original, OpenSSL function which additionally
+// returned -1 on error.
+OPENSSL_EXPORT int RSA_verify(int hash_nid, const uint8_t *msg, size_t msg_len,
+ const uint8_t *sig, size_t sig_len, RSA *rsa);
+
+// RSA_verify_pss_mgf1 verifies that |sig_len| bytes from |sig| are a valid,
+// RSASSA-PSS signature of |msg_len| bytes at |msg| by |rsa|. It returns one if
+// the signature is valid and zero otherwise. MGF1 is used as the mask
+// generation function.
+//
+// The |md| and |mgf1_md| arguments identify the hash used to calculate |msg|
+// and the MGF1 hash, respectively. If |mgf1_md| is NULL, |md| is
+// used. |salt_len| specifies the expected salt length in bytes.
+//
+// If |salt_len| is -1, then the salt length is the same as the hash length. If
+// -2, then the salt length is recovered and all values accepted. If unsure, use
+// -1.
+OPENSSL_EXPORT int RSA_verify_pss_mgf1(RSA *rsa, const uint8_t *msg,
+ size_t msg_len, const EVP_MD *md,
+ const EVP_MD *mgf1_md, int salt_len,
+ const uint8_t *sig, size_t sig_len);
+
+// RSA_verify_raw verifies |in_len| bytes of signature from |in| using the
+// public key from |rsa| and writes, at most, |max_out| bytes of plaintext to
+// |out|. The |max_out| argument must be, at least, |RSA_size| in order to
+// ensure success.
+//
+// It returns 1 on success or zero on error.
+//
+// The |padding| argument must be one of the |RSA_*_PADDING| values. If in
+// doubt, |RSA_PKCS1_PADDING| is the most common but |RSA_PKCS1_PSS_PADDING|
+// (via the |EVP_PKEY| interface) is preferred for new protocols.
+OPENSSL_EXPORT int RSA_verify_raw(RSA *rsa, size_t *out_len, uint8_t *out,
+ size_t max_out, const uint8_t *in,
+ size_t in_len, int padding);
+
+// RSA_private_encrypt encrypts |flen| bytes from |from| with the private key in
+// |rsa| and writes the encrypted data to |to|. The |to| buffer must have at
+// least |RSA_size| bytes of space. It returns the number of bytes written, or
+// -1 on error. The |padding| argument must be one of the |RSA_*_PADDING|
+// values. If in doubt, |RSA_PKCS1_PADDING| is the most common but
+// |RSA_PKCS1_PSS_PADDING| (via the |EVP_PKEY| interface) is preferred for new
+// protocols.
+//
+// WARNING: this function is dangerous because it breaks the usual return value
+// convention. Use |RSA_sign_raw| instead.
+OPENSSL_EXPORT int RSA_private_encrypt(size_t flen, const uint8_t *from,
+ uint8_t *to, RSA *rsa, int padding);
+
+// RSA_public_decrypt verifies |flen| bytes of signature from |from| using the
+// public key in |rsa| and writes the plaintext to |to|. The |to| buffer must
+// have at least |RSA_size| bytes of space. It returns the number of bytes
+// written, or -1 on error. The |padding| argument must be one of the
+// |RSA_*_PADDING| values. If in doubt, |RSA_PKCS1_PADDING| is the most common
+// but |RSA_PKCS1_PSS_PADDING| (via the |EVP_PKEY| interface) is preferred for
+// new protocols.
+//
+// WARNING: this function is dangerous because it breaks the usual return value
+// convention. Use |RSA_verify_raw| instead.
+OPENSSL_EXPORT int RSA_public_decrypt(size_t flen, const uint8_t *from,
+ uint8_t *to, RSA *rsa, int padding);
+
+
+// Utility functions.
+
+// RSA_size returns the number of bytes in the modulus, which is also the size
+// of a signature or encrypted value using |rsa|.
+OPENSSL_EXPORT unsigned RSA_size(const RSA *rsa);
+
+// RSA_is_opaque returns one if |rsa| is opaque and doesn't expose its key
+// material. Otherwise it returns zero.
+OPENSSL_EXPORT int RSA_is_opaque(const RSA *rsa);
+
+// RSAPublicKey_dup allocates a fresh |RSA| and copies the public key from
+// |rsa| into it. It returns the fresh |RSA| object, or NULL on error.
+OPENSSL_EXPORT RSA *RSAPublicKey_dup(const RSA *rsa);
+
+// RSAPrivateKey_dup allocates a fresh |RSA| and copies the private key from
+// |rsa| into it. It returns the fresh |RSA| object, or NULL on error.
+OPENSSL_EXPORT RSA *RSAPrivateKey_dup(const RSA *rsa);
+
+// RSA_check_key performs basic validity tests on |rsa|. It returns one if
+// they pass and zero otherwise. Opaque keys and public keys always pass. If it
+// returns zero then a more detailed error is available on the error queue.
+OPENSSL_EXPORT int RSA_check_key(const RSA *rsa);
+
+// RSA_check_fips performs public key validity tests on |key|. It returns one
+// if they pass and zero otherwise. Opaque keys always fail.
+OPENSSL_EXPORT int RSA_check_fips(RSA *key);
+
+// RSA_verify_PKCS1_PSS_mgf1 verifies that |EM| is a correct PSS padding of
+// |mHash|, where |mHash| is a digest produced by |Hash|. |EM| must point to
+// exactly |RSA_size(rsa)| bytes of data. The |mgf1Hash| argument specifies the
+// hash function for generating the mask. If NULL, |Hash| is used. The |sLen|
+// argument specifies the expected salt length in bytes. If |sLen| is -1 then
+// the salt length is the same as the hash length. If -2, then the salt length
+// is recovered and all values accepted.
+//
+// If unsure, use -1.
+//
+// It returns one on success or zero on error.
+//
+// This function implements only the low-level padding logic. Use
+// |RSA_verify_pss_mgf1| instead.
+OPENSSL_EXPORT int RSA_verify_PKCS1_PSS_mgf1(RSA *rsa, const uint8_t *mHash,
+ const EVP_MD *Hash,
+ const EVP_MD *mgf1Hash,
+ const uint8_t *EM, int sLen);
+
+// RSA_padding_add_PKCS1_PSS_mgf1 writes a PSS padding of |mHash| to |EM|,
+// where |mHash| is a digest produced by |Hash|. |RSA_size(rsa)| bytes of
+// output will be written to |EM|. The |mgf1Hash| argument specifies the hash
+// function for generating the mask. If NULL, |Hash| is used. The |sLen|
+// argument specifies the expected salt length in bytes. If |sLen| is -1 then
+// the salt length is the same as the hash length. If -2, then the salt length
+// is maximal given the space in |EM|.
+//
+// It returns one on success or zero on error.
+//
+// This function implements only the low-level padding logic. Use
+// |RSA_sign_pss_mgf1| instead.
+OPENSSL_EXPORT int RSA_padding_add_PKCS1_PSS_mgf1(RSA *rsa, uint8_t *EM,
+ const uint8_t *mHash,
+ const EVP_MD *Hash,
+ const EVP_MD *mgf1Hash,
+ int sLen);
+
+// RSA_padding_add_PKCS1_OAEP_mgf1 writes an OAEP padding of |from| to |to|
+// with the given parameters and hash functions. If |md| is NULL then SHA-1 is
+// used. If |mgf1md| is NULL then the value of |md| is used (which means SHA-1
+// if that, in turn, is NULL).
+//
+// It returns one on success or zero on error.
+OPENSSL_EXPORT int RSA_padding_add_PKCS1_OAEP_mgf1(
+ uint8_t *to, size_t to_len, const uint8_t *from, size_t from_len,
+ const uint8_t *param, size_t param_len, const EVP_MD *md,
+ const EVP_MD *mgf1md);
+
+// RSA_add_pkcs1_prefix builds a version of |msg| prefixed with the DigestInfo
+// header for the given hash function and sets |out_msg| to point to it. On
+// successful return, if |*is_alloced| is one, the caller must release
+// |*out_msg| with |OPENSSL_free|.
+OPENSSL_EXPORT int RSA_add_pkcs1_prefix(uint8_t **out_msg, size_t *out_msg_len,
+ int *is_alloced, int hash_nid,
+ const uint8_t *msg, size_t msg_len);
+
+
+// ASN.1 functions.
+
+// RSA_parse_public_key parses a DER-encoded RSAPublicKey structure (RFC 3447)
+// from |cbs| and advances |cbs|. It returns a newly-allocated |RSA| or NULL on
+// error.
+OPENSSL_EXPORT RSA *RSA_parse_public_key(CBS *cbs);
+
+// RSA_public_key_from_bytes parses |in| as a DER-encoded RSAPublicKey structure
+// (RFC 3447). It returns a newly-allocated |RSA| or NULL on error.
+OPENSSL_EXPORT RSA *RSA_public_key_from_bytes(const uint8_t *in, size_t in_len);
+
+// RSA_marshal_public_key marshals |rsa| as a DER-encoded RSAPublicKey structure
+// (RFC 3447) and appends the result to |cbb|. It returns one on success and
+// zero on failure.
+OPENSSL_EXPORT int RSA_marshal_public_key(CBB *cbb, const RSA *rsa);
+
+// RSA_public_key_to_bytes marshals |rsa| as a DER-encoded RSAPublicKey
+// structure (RFC 3447) and, on success, sets |*out_bytes| to a newly allocated
+// buffer containing the result and returns one. Otherwise, it returns zero. The
+// result should be freed with |OPENSSL_free|.
+OPENSSL_EXPORT int RSA_public_key_to_bytes(uint8_t **out_bytes, size_t *out_len,
+ const RSA *rsa);
+
+// RSA_parse_private_key parses a DER-encoded RSAPrivateKey structure (RFC 3447)
+// from |cbs| and advances |cbs|. It returns a newly-allocated |RSA| or NULL on
+// error.
+OPENSSL_EXPORT RSA *RSA_parse_private_key(CBS *cbs);
+
+// RSA_private_key_from_bytes parses |in| as a DER-encoded RSAPrivateKey
+// structure (RFC 3447). It returns a newly-allocated |RSA| or NULL on error.
+OPENSSL_EXPORT RSA *RSA_private_key_from_bytes(const uint8_t *in,
+ size_t in_len);
+
+// RSA_marshal_private_key marshals |rsa| as a DER-encoded RSAPrivateKey
+// structure (RFC 3447) and appends the result to |cbb|. It returns one on
+// success and zero on failure.
+OPENSSL_EXPORT int RSA_marshal_private_key(CBB *cbb, const RSA *rsa);
+
+// RSA_private_key_to_bytes marshals |rsa| as a DER-encoded RSAPrivateKey
+// structure (RFC 3447) and, on success, sets |*out_bytes| to a newly allocated
+// buffer containing the result and returns one. Otherwise, it returns zero. The
+// result should be freed with |OPENSSL_free|.
+OPENSSL_EXPORT int RSA_private_key_to_bytes(uint8_t **out_bytes,
+ size_t *out_len, const RSA *rsa);
+
+
+// ex_data functions.
+//
+// See |ex_data.h| for details.
+
+OPENSSL_EXPORT int RSA_get_ex_new_index(long argl, void *argp,
+ CRYPTO_EX_unused *unused,
+ CRYPTO_EX_dup *dup_unused,
+ CRYPTO_EX_free *free_func);
+OPENSSL_EXPORT int RSA_set_ex_data(RSA *rsa, int idx, void *arg);
+OPENSSL_EXPORT void *RSA_get_ex_data(const RSA *rsa, int idx);
+
+
+// Flags.
+
+// RSA_FLAG_OPAQUE specifies that this RSA_METHOD does not expose its key
+// material. This may be set if, for instance, it is wrapping some other crypto
+// API, like a platform key store.
+#define RSA_FLAG_OPAQUE 1
+
+// RSA_FLAG_NO_BLINDING disables blinding of private operations, which is a
+// dangerous thing to do. It is deprecated and should not be used. It will
+// be ignored whenever possible.
+//
+// This flag must be used if a key without the public exponent |e| is used for
+// private key operations; avoid using such keys whenever possible.
+#define RSA_FLAG_NO_BLINDING 8
+
+// RSA_FLAG_EXT_PKEY is deprecated and ignored.
+#define RSA_FLAG_EXT_PKEY 0x20
+
+
+// RSA public exponent values.
+
+#define RSA_3 0x3
+#define RSA_F4 0x10001
+
+
+// Deprecated functions.
+
+#define RSA_METHOD_FLAG_NO_CHECK RSA_FLAG_OPAQUE
+
+// RSA_flags returns the flags for |rsa|. These are a bitwise OR of |RSA_FLAG_*|
+// constants.
+OPENSSL_EXPORT int RSA_flags(const RSA *rsa);
+
+// RSA_blinding_on returns one.
+OPENSSL_EXPORT int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
+
+// RSA_generate_key behaves like |RSA_generate_key_ex|, which is what you
+// should use instead. It returns NULL on error, or a newly-allocated |RSA| on
+// success. This function is provided for compatibility only. The |callback|
+// and |cb_arg| parameters must be NULL.
+OPENSSL_EXPORT RSA *RSA_generate_key(int bits, unsigned long e, void *callback,
+ void *cb_arg);
+
+// d2i_RSAPublicKey parses an ASN.1, DER-encoded, RSA public 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 |RSA| 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.
+OPENSSL_EXPORT RSA *d2i_RSAPublicKey(RSA **out, const uint8_t **inp, long len);
+
+// i2d_RSAPublicKey marshals |in| 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.
+OPENSSL_EXPORT int i2d_RSAPublicKey(const RSA *in, uint8_t **outp);
+
+// d2i_RSAPrivateKey parses an ASN.1, DER-encoded, RSA 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 |RSA| 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.
+OPENSSL_EXPORT RSA *d2i_RSAPrivateKey(RSA **out, const uint8_t **inp, long len);
+
+// i2d_RSAPrivateKey marshals |in| 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.
+OPENSSL_EXPORT int i2d_RSAPrivateKey(const RSA *in, uint8_t **outp);
+
+// RSA_padding_add_PKCS1_PSS acts like |RSA_padding_add_PKCS1_PSS_mgf1| but the
+// |mgf1Hash| parameter of the latter is implicitly set to |Hash|.
+//
+// This function implements only the low-level padding logic. Use
+// |RSA_sign_pss_mgf1| instead.
+OPENSSL_EXPORT int RSA_padding_add_PKCS1_PSS(RSA *rsa, uint8_t *EM,
+ const uint8_t *mHash,
+ const EVP_MD *Hash, int sLen);
+
+// RSA_verify_PKCS1_PSS acts like |RSA_verify_PKCS1_PSS_mgf1| but the
+// |mgf1Hash| parameter of the latter is implicitly set to |Hash|.
+//
+// This function implements only the low-level padding logic. Use
+// |RSA_verify_pss_mgf1| instead.
+OPENSSL_EXPORT int RSA_verify_PKCS1_PSS(RSA *rsa, const uint8_t *mHash,
+ const EVP_MD *Hash, const uint8_t *EM,
+ int sLen);
+
+// RSA_padding_add_PKCS1_OAEP acts like |RSA_padding_add_PKCS1_OAEP_mgf1| but
+// the |md| and |mgf1md| parameters of the latter are implicitly set to NULL,
+// which means SHA-1.
+OPENSSL_EXPORT int RSA_padding_add_PKCS1_OAEP(uint8_t *to, size_t to_len,
+ const uint8_t *from,
+ size_t from_len,
+ const uint8_t *param,
+ size_t param_len);
+
+
+struct rsa_meth_st {
+ struct openssl_method_common_st common;
+
+ void *app_data;
+
+ int (*init)(RSA *rsa);
+ int (*finish)(RSA *rsa);
+
+ // size returns the size of the RSA modulus in bytes.
+ size_t (*size)(const RSA *rsa);
+
+ int (*sign)(int type, const uint8_t *m, unsigned int m_length,
+ uint8_t *sigret, unsigned int *siglen, const RSA *rsa);
+
+ // These functions mirror the |RSA_*| functions of the same name.
+ int (*sign_raw)(RSA *rsa, size_t *out_len, uint8_t *out, size_t max_out,
+ const uint8_t *in, size_t in_len, int padding);
+ int (*decrypt)(RSA *rsa, size_t *out_len, uint8_t *out, size_t max_out,
+ const uint8_t *in, size_t in_len, int padding);
+
+ // private_transform takes a big-endian integer from |in|, calculates the
+ // d'th power of it, modulo the RSA modulus and writes the result as a
+ // big-endian integer to |out|. Both |in| and |out| are |len| bytes long and
+ // |len| is always equal to |RSA_size(rsa)|. If the result of the transform
+ // can be represented in fewer than |len| bytes, then |out| must be zero
+ // padded on the left.
+ //
+ // It returns one on success and zero otherwise.
+ //
+ // RSA decrypt and sign operations will call this, thus an ENGINE might wish
+ // to override it in order to avoid having to implement the padding
+ // functionality demanded by those, higher level, operations.
+ int (*private_transform)(RSA *rsa, uint8_t *out, const uint8_t *in,
+ size_t len);
+
+ int flags;
+};
+
+
+// Private functions.
+
+typedef struct bn_blinding_st BN_BLINDING;
+
+struct rsa_st {
+ RSA_METHOD *meth;
+
+ // Access to the following fields was historically allowed, but
+ // deprecated. Use |RSA_get0_*| and |RSA_set0_*| instead. Access to all other
+ // fields is forbidden and will cause threading errors.
+ BIGNUM *n;
+ BIGNUM *e;
+ BIGNUM *d;
+ BIGNUM *p;
+ BIGNUM *q;
+ BIGNUM *dmp1;
+ BIGNUM *dmq1;
+ BIGNUM *iqmp;
+
+ // be careful using this if the RSA structure is shared
+ CRYPTO_EX_DATA ex_data;
+ CRYPTO_refcount_t references;
+ int flags;
+
+ CRYPTO_MUTEX lock;
+
+ // Used to cache montgomery values. The creation of these values is protected
+ // by |lock|.
+ BN_MONT_CTX *mont_n;
+ BN_MONT_CTX *mont_p;
+ BN_MONT_CTX *mont_q;
+
+ // The following fields are copies of |d|, |dmp1|, and |dmq1|, respectively,
+ // but with the correct widths to prevent side channels. These must use
+ // separate copies due to threading concerns caused by OpenSSL's API
+ // mistakes. See https://github.com/openssl/openssl/issues/5158 and
+ // the |freeze_private_key| implementation.
+ BIGNUM *d_fixed, *dmp1_fixed, *dmq1_fixed;
+
+ // inv_small_mod_large_mont is q^-1 mod p in Montgomery form, using |mont_p|,
+ // if |p| >= |q|. Otherwise, it is p^-1 mod q in Montgomery form, using
+ // |mont_q|.
+ BIGNUM *inv_small_mod_large_mont;
+
+ // num_blindings contains the size of the |blindings| and |blindings_inuse|
+ // arrays. This member and the |blindings_inuse| array are protected by
+ // |lock|.
+ unsigned num_blindings;
+ // blindings is an array of BN_BLINDING structures that can be reserved by a
+ // thread by locking |lock| and changing the corresponding element in
+ // |blindings_inuse| from 0 to 1.
+ BN_BLINDING **blindings;
+ unsigned char *blindings_inuse;
+
+ // private_key_frozen is one if the key has been used for a private key
+ // operation and may no longer be mutated.
+ unsigned private_key_frozen:1;
+};
+
+
+#if defined(__cplusplus)
+} // extern C
+
+extern "C++" {
+
+namespace bssl {
+
+BORINGSSL_MAKE_DELETER(RSA, RSA_free)
+
+} // namespace bssl
+
+} // extern C++
+
+#endif
+
+#define RSA_R_BAD_ENCODING 100
+#define RSA_R_BAD_E_VALUE 101
+#define RSA_R_BAD_FIXED_HEADER_DECRYPT 102
+#define RSA_R_BAD_PAD_BYTE_COUNT 103
+#define RSA_R_BAD_RSA_PARAMETERS 104
+#define RSA_R_BAD_SIGNATURE 105
+#define RSA_R_BAD_VERSION 106
+#define RSA_R_BLOCK_TYPE_IS_NOT_01 107
+#define RSA_R_BN_NOT_INITIALIZED 108
+#define RSA_R_CANNOT_RECOVER_MULTI_PRIME_KEY 109
+#define RSA_R_CRT_PARAMS_ALREADY_GIVEN 110
+#define RSA_R_CRT_VALUES_INCORRECT 111
+#define RSA_R_DATA_LEN_NOT_EQUAL_TO_MOD_LEN 112
+#define RSA_R_DATA_TOO_LARGE 113
+#define RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE 114
+#define RSA_R_DATA_TOO_LARGE_FOR_MODULUS 115
+#define RSA_R_DATA_TOO_SMALL 116
+#define RSA_R_DATA_TOO_SMALL_FOR_KEY_SIZE 117
+#define RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY 118
+#define RSA_R_D_E_NOT_CONGRUENT_TO_1 119
+#define RSA_R_EMPTY_PUBLIC_KEY 120
+#define RSA_R_ENCODE_ERROR 121
+#define RSA_R_FIRST_OCTET_INVALID 122
+#define RSA_R_INCONSISTENT_SET_OF_CRT_VALUES 123
+#define RSA_R_INTERNAL_ERROR 124
+#define RSA_R_INVALID_MESSAGE_LENGTH 125
+#define RSA_R_KEY_SIZE_TOO_SMALL 126
+#define RSA_R_LAST_OCTET_INVALID 127
+#define RSA_R_MODULUS_TOO_LARGE 128
+#define RSA_R_MUST_HAVE_AT_LEAST_TWO_PRIMES 129
+#define RSA_R_NO_PUBLIC_EXPONENT 130
+#define RSA_R_NULL_BEFORE_BLOCK_MISSING 131
+#define RSA_R_N_NOT_EQUAL_P_Q 132
+#define RSA_R_OAEP_DECODING_ERROR 133
+#define RSA_R_ONLY_ONE_OF_P_Q_GIVEN 134
+#define RSA_R_OUTPUT_BUFFER_TOO_SMALL 135
+#define RSA_R_PADDING_CHECK_FAILED 136
+#define RSA_R_PKCS_DECODING_ERROR 137
+#define RSA_R_SLEN_CHECK_FAILED 138
+#define RSA_R_SLEN_RECOVERY_FAILED 139
+#define RSA_R_TOO_LONG 140
+#define RSA_R_TOO_MANY_ITERATIONS 141
+#define RSA_R_UNKNOWN_ALGORITHM_TYPE 142
+#define RSA_R_UNKNOWN_PADDING_TYPE 143
+#define RSA_R_VALUE_MISSING 144
+#define RSA_R_WRONG_SIGNATURE_LENGTH 145
+#define RSA_R_PUBLIC_KEY_VALIDATION_FAILED 146
+#define RSA_R_D_OUT_OF_RANGE 147
+
+#endif // OPENSSL_HEADER_RSA_H
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