236 lines
9.2 KiB
C
236 lines
9.2 KiB
C
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// Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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#ifndef OPENSSL_HEADER_RSA_INTERNAL_H
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#define OPENSSL_HEADER_RSA_INTERNAL_H
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#include <openssl/base.h>
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#include <openssl/bn.h>
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#include <openssl/rsa.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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typedef struct bn_blinding_st BN_BLINDING;
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struct rsa_meth_st {
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void *app_data;
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int (*init)(RSA *rsa);
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int (*finish)(RSA *rsa);
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// size returns the size of the RSA modulus in bytes.
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size_t (*size)(const RSA *rsa);
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// Set via |RSA_meth_set_sign|. The default behavior for |sign| is
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// implemented in |RSA_sign|. If custom functionality is provided, |sign|
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// will be invoked within |RSA_sign|.
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int (*sign)(int type, const uint8_t *m, unsigned int m_length,
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uint8_t *sigret, unsigned int *siglen, const RSA *rsa);
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// Set via |RSA_meth_set_priv_enc|. |sign_raw| is equivalent to the
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// |priv_enc| field of OpenSSL's |RSA_METHOD| struct. The default behavior
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// for |sign_raw| is implemented in |RSA_sign_raw|. If custom
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// functionality is provided, |sign_raw| will be invoked within
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// |RSA_sign_raw|.
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int (*sign_raw)(int max_out, const uint8_t *in, uint8_t *out, RSA *rsa,
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int padding);
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// Set via |RSA_meth_set_pub_dec|. |verify_raw| is equivalent to the
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// |pub_dec| field of OpenSSL's |RSA_METHOD| struct. The default behavior
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// for |verify_raw| is implemented in |RSA_verify_raw|. If custom
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// functionality is provided, |verify_raw| will be invoked within
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// |RSA_verify_raw|.
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int (*verify_raw)(int max_out, const uint8_t *in, uint8_t *out, RSA *rsa,
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int padding);
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// Set via |RSA_meth_set_priv_dec|. |decrypt| is equivalent to the
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// |priv_dec| field of OpenSSL's |RSA_METHOD| struct. The default behavior
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// for |decrypt| is implemented in |RSA_decrypt|. If custom
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// functionality is provided, |decrypt| will be invoked within
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// |RSA_decrypt|.
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int (*decrypt)(int max_out, const uint8_t *in, uint8_t *out, RSA *rsa,
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int padding);
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// Set via |RSA_meth_set_pub_enc|. |encrypt| is equivalent to the
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// |pub_enc| field of OpenSSL's |RSA_METHOD| struct. The default behavior
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// for |encrypt| is implemented in |RSA_encrypt|. If custom
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// functionality is provided, |encrypt| will be invoked within
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// |RSA_encrypt|.
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int (*encrypt)(int max_out, const uint8_t *in, uint8_t *out, RSA *rsa,
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int padding);
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// private_transform takes a big-endian integer from |in|, calculates the
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// d'th power of it, modulo the RSA modulus and writes the result as a
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// big-endian integer to |out|. Both |in| and |out| are |len| bytes long and
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// |len| is always equal to |RSA_size(rsa)|. If the result of the transform
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// can be represented in fewer than |len| bytes, then |out| must be zero
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// padded on the left.
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//
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// It returns one on success and zero otherwise.
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//
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// RSA decrypt and sign operations will call this, thus an ENGINE might wish
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// to override it in order to avoid having to implement the padding
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// functionality demanded by those, higher level, operations.
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int (*private_transform)(RSA *rsa, uint8_t *out, const uint8_t *in,
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size_t len);
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int flags;
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};
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struct rsa_st {
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const RSA_METHOD *meth;
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BIGNUM *n;
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BIGNUM *e;
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BIGNUM *d;
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BIGNUM *p;
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BIGNUM *q;
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BIGNUM *dmp1;
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BIGNUM *dmq1;
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BIGNUM *iqmp;
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// If a PSS only key this contains the parameter restrictions.
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RSASSA_PSS_PARAMS *pss;
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// be careful using this if the RSA structure is shared
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CRYPTO_EX_DATA ex_data;
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CRYPTO_refcount_t references;
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int flags;
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CRYPTO_MUTEX lock;
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// Used to cache montgomery values. The creation of these values is protected
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// by |lock|.
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BN_MONT_CTX *mont_n;
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BN_MONT_CTX *mont_p;
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BN_MONT_CTX *mont_q;
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// The following fields are copies of |d|, |dmp1|, and |dmq1|, respectively,
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// but with the correct widths to prevent side channels. These must use
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// separate copies due to threading concerns caused by OpenSSL's API
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// mistakes. See https://github.com/openssl/openssl/issues/5158 and
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// the |freeze_private_key| implementation.
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BIGNUM *d_fixed, *dmp1_fixed, *dmq1_fixed;
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// iqmp_mont is q^-1 mod p in Montgomery form, using |mont_p|.
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BIGNUM *iqmp_mont;
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// num_blindings contains the size of the |blindings| and |blindings_inuse|
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// arrays. This member and the |blindings_inuse| array are protected by
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// |lock|.
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size_t num_blindings;
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// blindings is an array of BN_BLINDING structures that can be reserved by a
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// thread by locking |lock| and changing the corresponding element in
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// |blindings_inuse| from 0 to 1.
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BN_BLINDING **blindings;
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unsigned char *blindings_inuse;
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uint64_t blinding_fork_generation;
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// private_key_frozen is one if the key has been used for a private key
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// operation and may no longer be mutated.
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unsigned private_key_frozen:1;
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};
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#define RSA_PKCS1_PADDING_SIZE 11
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// Default implementations of RSA operations.
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size_t rsa_default_size(const RSA *rsa);
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int rsa_default_sign_raw(RSA *rsa, size_t *out_len, uint8_t *out,
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size_t max_out, const uint8_t *in, size_t in_len,
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int padding);
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int rsa_default_private_transform(RSA *rsa, uint8_t *out, const uint8_t *in,
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size_t len);
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BN_BLINDING *BN_BLINDING_new(void);
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void BN_BLINDING_free(BN_BLINDING *b);
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void BN_BLINDING_invalidate(BN_BLINDING *b);
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int BN_BLINDING_convert(BIGNUM *n, BN_BLINDING *b, const BIGNUM *e,
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const BN_MONT_CTX *mont_ctx, BN_CTX *ctx);
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int BN_BLINDING_invert(BIGNUM *n, const BN_BLINDING *b, BN_MONT_CTX *mont_ctx,
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BN_CTX *ctx);
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int RSA_padding_add_PKCS1_type_1(uint8_t *to, size_t to_len,
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const uint8_t *from, size_t from_len);
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int RSA_padding_check_PKCS1_type_1(uint8_t *out, size_t *out_len,
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size_t max_out, const uint8_t *from,
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size_t from_len);
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int RSA_padding_add_none(uint8_t *to, size_t to_len, const uint8_t *from,
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size_t from_len);
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// rsa_private_transform_no_self_test calls either the method-specific
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// |private_transform| function (if given) or the generic one. See the comment
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// for |private_transform| in |rsa_meth_st|.
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int rsa_private_transform_no_self_test(RSA *rsa, uint8_t *out,
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const uint8_t *in, size_t len);
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// rsa_private_transform acts the same as |rsa_private_transform_no_self_test|
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// but, in FIPS mode, performs an RSA self test before calling the default RSA
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// implementation.
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int rsa_private_transform(RSA *rsa, uint8_t *out, const uint8_t *in,
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size_t len);
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// rsa_invalidate_key is called after |rsa| has been mutated, to invalidate
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// fields derived from the original structure. This function assumes exclusive
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// access to |rsa|. In particular, no other thread may be concurrently signing,
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// etc., with |rsa|.
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void rsa_invalidate_key(RSA *rsa);
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// This constant is exported for test purposes.
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extern const BN_ULONG kBoringSSLRSASqrtTwo[];
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extern const size_t kBoringSSLRSASqrtTwoLen;
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// Functions that avoid self-tests.
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//
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// Self-tests need to call functions that don't try and ensure that the
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// self-tests have passed. These functions, in turn, need to limit themselves
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// to such functions too.
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//
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// These functions are the same as their public versions, but skip the self-test
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// check.
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int rsa_verify_no_self_test(int hash_nid, const uint8_t *digest,
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size_t digest_len, const uint8_t *sig,
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size_t sig_len, RSA *rsa);
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int rsa_verify_raw_no_self_test(RSA *rsa, size_t *out_len, uint8_t *out,
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size_t max_out, const uint8_t *in,
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size_t in_len, int padding);
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int rsa_sign_no_self_test(int hash_nid, const uint8_t *digest,
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size_t digest_len, uint8_t *out, unsigned *out_len,
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RSA *rsa);
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// rsa_digestsign_no_self_test calculates the digest and calls
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// |rsa_sign_no_self_test|, which doesn't try to run the self-test first. This
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// is for use in the self tests themselves, to prevent an infinite loop.
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int rsa_digestsign_no_self_test(const EVP_MD *md, const uint8_t *input,
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size_t in_len, uint8_t *out, unsigned *out_len,
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RSA *rsa);
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// rsa_digestverify_no_self_test calculates the digest and calls
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// |rsa_verify_no_self_test|, which doesn't try to run the self-test first. This
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// is for use in the self tests themselves, to prevent an infinite loop.
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int rsa_digestverify_no_self_test(const EVP_MD *md, const uint8_t *input,
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size_t in_len, const uint8_t *sig,
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size_t sig_len, RSA *rsa);
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// Performs several checks on the public component of the given RSA key.
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// See the implemetation in |rsa.c| for details.
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int is_public_component_of_rsa_key_good(const RSA *key);
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OPENSSL_EXPORT const RSASSA_PSS_PARAMS *RSA_get0_ssa_pss_params(const RSA *rsa);
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#if defined(__cplusplus)
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} // extern C
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#endif
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#endif // OPENSSL_HEADER_RSA_INTERNAL_H
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