/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #ifndef OPENSSL_HEADER_EVP_H #define OPENSSL_HEADER_EVP_H #include #include /* 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 #include #include #include #include #if defined(__cplusplus) extern "C" { #endif /* EVP abstracts over public/private key algorithms. */ /* Public key objects. */ /* EVP_PKEY_new creates a new, empty public-key object and returns it or NULL * on allocation failure. */ OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_new(void); /* EVP_PKEY_free frees all data referenced by |pkey| and then frees |pkey| * itself. */ OPENSSL_EXPORT void EVP_PKEY_free(EVP_PKEY *pkey); /* EVP_PKEY_up_ref increments the reference count of |pkey| and returns it. */ OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_up_ref(EVP_PKEY *pkey); /* EVP_PKEY_is_opaque returns one if |pkey| is opaque. Opaque keys are backed by * custom implementations which do not expose key material and parameters. It is * an error to attempt to duplicate, export, or compare an opaque key. */ OPENSSL_EXPORT int EVP_PKEY_is_opaque(const EVP_PKEY *pkey); /* EVP_PKEY_supports_digest returns one if |pkey| supports digests of * type |md|. This is intended for use with EVP_PKEYs backing custom * implementations which can't sign all digests. */ OPENSSL_EXPORT int EVP_PKEY_supports_digest(const EVP_PKEY *pkey, const EVP_MD *md); /* EVP_PKEY_cmp compares |a| and |b| and returns one if they are equal, zero if * not and a negative number on error. * * WARNING: this differs from the traditional return value of a "cmp" * function. */ OPENSSL_EXPORT int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b); /* EVP_PKEY_copy_parameters sets the parameters of |to| to equal the parameters * of |from|. It returns one on success and zero on error. */ OPENSSL_EXPORT int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from); /* EVP_PKEY_missing_parameters returns one if |pkey| is missing needed * parameters or zero if not, or if the algorithm doesn't take parameters. */ OPENSSL_EXPORT int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey); /* EVP_PKEY_size returns the maximum size, in bytes, of a signature signed by * |pkey|. For an RSA key, this returns the number of bytes needed to represent * the modulus. For an EC key, this returns the maximum size of a DER-encoded * ECDSA signature. */ OPENSSL_EXPORT int EVP_PKEY_size(const EVP_PKEY *pkey); /* EVP_PKEY_bits returns the "size", in bits, of |pkey|. For an RSA key, this * returns the bit length of the modulus. For an EC key, this returns the bit * length of the group order. */ OPENSSL_EXPORT int EVP_PKEY_bits(EVP_PKEY *pkey); /* EVP_PKEY_id returns the type of |pkey|, which is one of the |EVP_PKEY_*| * values. */ OPENSSL_EXPORT int EVP_PKEY_id(const EVP_PKEY *pkey); /* EVP_PKEY_type returns |nid| if |nid| is a known key type and |NID_undef| * otherwise. */ OPENSSL_EXPORT int EVP_PKEY_type(int nid); /* Getting and setting concrete public key types. * * The following functions get and set the underlying public key in an * |EVP_PKEY| object. The |set1| functions take an additional reference to the * underlying key and return one on success or zero on error. The |assign| * functions adopt the caller's reference. The |get1| functions return a fresh * reference to the underlying object or NULL if |pkey| is not of the correct * type. The |get0| functions behave the same but return a non-owning * pointer. */ OPENSSL_EXPORT int EVP_PKEY_set1_RSA(EVP_PKEY *pkey, RSA *key); OPENSSL_EXPORT int EVP_PKEY_assign_RSA(EVP_PKEY *pkey, RSA *key); OPENSSL_EXPORT RSA *EVP_PKEY_get0_RSA(EVP_PKEY *pkey); OPENSSL_EXPORT RSA *EVP_PKEY_get1_RSA(EVP_PKEY *pkey); OPENSSL_EXPORT int EVP_PKEY_set1_DSA(EVP_PKEY *pkey, DSA *key); OPENSSL_EXPORT int EVP_PKEY_assign_DSA(EVP_PKEY *pkey, DSA *key); OPENSSL_EXPORT DSA *EVP_PKEY_get0_DSA(EVP_PKEY *pkey); OPENSSL_EXPORT DSA *EVP_PKEY_get1_DSA(EVP_PKEY *pkey); OPENSSL_EXPORT int EVP_PKEY_set1_EC_KEY(EVP_PKEY *pkey, EC_KEY *key); OPENSSL_EXPORT int EVP_PKEY_assign_EC_KEY(EVP_PKEY *pkey, EC_KEY *key); OPENSSL_EXPORT EC_KEY *EVP_PKEY_get0_EC_KEY(EVP_PKEY *pkey); OPENSSL_EXPORT EC_KEY *EVP_PKEY_get1_EC_KEY(EVP_PKEY *pkey); #define EVP_PKEY_NONE NID_undef #define EVP_PKEY_RSA NID_rsaEncryption #define EVP_PKEY_DSA NID_dsa #define EVP_PKEY_EC NID_X9_62_id_ecPublicKey /* EVP_PKEY_assign sets the underlying key of |pkey| to |key|, which must be of * the given type. The |type| argument should be one of the |EVP_PKEY_*| * values. */ OPENSSL_EXPORT int EVP_PKEY_assign(EVP_PKEY *pkey, int type, void *key); /* EVP_PKEY_set_type sets the type of |pkey| to |type|, which should be one of * the |EVP_PKEY_*| values. It returns one if sucessful or zero otherwise. If * |pkey| is NULL, it simply reports whether the type is known. */ OPENSSL_EXPORT int EVP_PKEY_set_type(EVP_PKEY *pkey, int type); /* EVP_PKEY_cmp_parameters compares the parameters of |a| and |b|. It returns * one if they match, zero if not, or a negative number of on error. * * WARNING: the return value differs from the usual return value convention. */ OPENSSL_EXPORT int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b); /* ASN.1 functions */ /* d2i_PrivateKey parses an ASN.1, DER-encoded, private key from |len| bytes at * |*inp|. If |out| is not NULL then, on exit, a pointer to the result is in * |*out|. If |*out| is already non-NULL on entry then the result is written * directly into |*out|, otherwise a fresh |EVP_PKEY| is allocated. However, * one should not depend on writing into |*out| because this behaviour is * likely to change in the future. On successful exit, |*inp| is advanced past * the DER structure. It returns the result or NULL on error. */ 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. */ OPENSSL_EXPORT EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **out, const uint8_t **inp, long len); /* i2d_PrivateKey marshals a private key from |key| to an ASN.1, DER * structure. If |outp| is not NULL then the result is written to |*outp| and * |*outp| is advanced just past the output. It returns the number of bytes in * the result, whether written or not, or a negative value on error. */ OPENSSL_EXPORT int i2d_PrivateKey(const EVP_PKEY *key, uint8_t **outp); /* i2d_PublicKey marshals a public key from |key| to a type-specific format. * If |outp| is not NULL then the result is written to |*outp| and * |*outp| is advanced just past the output. It returns the number of bytes in * the result, whether written or not, or a negative value on error. * * RSA keys are serialized as a DER-encoded RSAPublicKey (RFC 3447) structure. * EC keys are serialized as an EC point per SEC 1. */ OPENSSL_EXPORT int i2d_PublicKey(EVP_PKEY *key, uint8_t **outp); /* Signing */ /* EVP_DigestSignInit sets up |ctx| for a signing operation with |type| and * |pkey|. The |ctx| argument must have been initialised with * |EVP_MD_CTX_init|. If |pctx| is not NULL, the |EVP_PKEY_CTX| of the signing * operation will be written to |*pctx|; this can be used to set alternative * signing options. * * It returns one on success, or zero on error. */ OPENSSL_EXPORT int EVP_DigestSignInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey); /* EVP_DigestSignUpdate appends |len| bytes from |data| to the data which will * be signed in |EVP_DigestSignFinal|. It returns one. */ OPENSSL_EXPORT int EVP_DigestSignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len); /* EVP_DigestSignFinal signs the data that has been included by one or more * calls to |EVP_DigestSignUpdate|. If |out_sig| is NULL then |*out_sig_len| is * set to the maximum number of output bytes. Otherwise, on entry, * |*out_sig_len| must contain the length of the |out_sig| buffer. If the call * is successful, the signature is written to |out_sig| and |*out_sig_len| is * set to its length. * * It returns one on success, or zero on error. */ OPENSSL_EXPORT int EVP_DigestSignFinal(EVP_MD_CTX *ctx, uint8_t *out_sig, size_t *out_sig_len); /* EVP_DigestSignAlgorithm encodes the signing parameters of |ctx| as an * AlgorithmIdentifer and saves the result in |algor|. * * It returns one on success, or zero on error. * * TODO(davidben): This API should eventually lose the dependency on * crypto/asn1/. */ OPENSSL_EXPORT int EVP_DigestSignAlgorithm(EVP_MD_CTX *ctx, X509_ALGOR *algor); /* Verifying */ /* EVP_DigestVerifyInit sets up |ctx| for a signature verification operation * with |type| and |pkey|. The |ctx| argument must have been initialised with * |EVP_MD_CTX_init|. If |pctx| is not NULL, the |EVP_PKEY_CTX| of the signing * operation will be written to |*pctx|; this can be used to set alternative * signing options. * * It returns one on success, or zero on error. */ OPENSSL_EXPORT int EVP_DigestVerifyInit(EVP_MD_CTX *ctx, EVP_PKEY_CTX **pctx, const EVP_MD *type, ENGINE *e, EVP_PKEY *pkey); /* EVP_DigestVerifyInitFromAlgorithm sets up |ctx| for a signature verification * operation with public key |pkey| and parameters from |algor|. The |ctx| * argument must have been initialised with |EVP_MD_CTX_init|. * * It returns one on success, or zero on error. * * TODO(davidben): This API should eventually lose the dependency on * crypto/asn1/. */ OPENSSL_EXPORT int EVP_DigestVerifyInitFromAlgorithm(EVP_MD_CTX *ctx, X509_ALGOR *algor, EVP_PKEY *pkey); /* EVP_DigestVerifyUpdate appends |len| bytes from |data| to the data which * will be verified by |EVP_DigestVerifyFinal|. It returns one. */ OPENSSL_EXPORT int EVP_DigestVerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len); /* EVP_DigestVerifyFinal verifies that |sig_len| bytes of |sig| are a valid * signature for the data that has been included by one or more calls to * |EVP_DigestVerifyUpdate|. It returns one on success and zero otherwise. */ OPENSSL_EXPORT int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, size_t sig_len); /* Signing (old functions) */ /* EVP_SignInit_ex configures |ctx|, which must already have been initialised, * for a fresh signing operation using the hash function |type|. It returns one * on success and zero otherwise. * * (In order to initialise |ctx|, either obtain it initialised with * |EVP_MD_CTX_create|, or use |EVP_MD_CTX_init|.) */ OPENSSL_EXPORT int EVP_SignInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl); /* EVP_SignInit is a deprecated version of |EVP_SignInit_ex|. * * TODO(fork): remove. */ OPENSSL_EXPORT int EVP_SignInit(EVP_MD_CTX *ctx, const EVP_MD *type); /* EVP_SignUpdate appends |len| bytes from |data| to the data which will be * signed in |EVP_SignFinal|. */ OPENSSL_EXPORT int EVP_SignUpdate(EVP_MD_CTX *ctx, const void *data, size_t len); /* EVP_SignFinal signs the data that has been included by one or more calls to * |EVP_SignUpdate|, using the key |pkey|, and writes it to |sig|. On entry, * |sig| must point to at least |EVP_PKEY_size(pkey)| bytes of space. The * actual size of the signature is written to |*out_sig_len|. * * It returns one on success and zero otherwise. * * It does not modify |ctx|, thus it's possible to continue to use |ctx| in * order to sign a longer message. */ OPENSSL_EXPORT int EVP_SignFinal(const EVP_MD_CTX *ctx, uint8_t *sig, unsigned int *out_sig_len, EVP_PKEY *pkey); /* Verifying (old functions) */ /* EVP_VerifyInit_ex configures |ctx|, which must already have been * initialised, for a fresh signature verification operation using the hash * function |type|. It returns one on success and zero otherwise. * * (In order to initialise |ctx|, either obtain it initialised with * |EVP_MD_CTX_create|, or use |EVP_MD_CTX_init|.) */ OPENSSL_EXPORT int EVP_VerifyInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl); /* EVP_VerifyInit is a deprecated version of |EVP_VerifyInit_ex|. * * TODO(fork): remove. */ OPENSSL_EXPORT int EVP_VerifyInit(EVP_MD_CTX *ctx, const EVP_MD *type); /* EVP_VerifyUpdate appends |len| bytes from |data| to the data which will be * signed in |EVP_VerifyFinal|. */ OPENSSL_EXPORT int EVP_VerifyUpdate(EVP_MD_CTX *ctx, const void *data, size_t len); /* EVP_VerifyFinal verifies that |sig_len| bytes of |sig| are a valid * signature, by |pkey|, for the data that has been included by one or more * calls to |EVP_VerifyUpdate|. * * It returns one on success and zero otherwise. * * It does not modify |ctx|, thus it's possible to continue to use |ctx| in * order to sign a longer message. */ OPENSSL_EXPORT int EVP_VerifyFinal(EVP_MD_CTX *ctx, const uint8_t *sig, size_t sig_len, EVP_PKEY *pkey); /* Printing */ /* EVP_PKEY_print_public prints a textual representation of the public key in * |pkey| to |out|. Returns one on success or zero otherwise. */ OPENSSL_EXPORT int EVP_PKEY_print_public(BIO *out, const EVP_PKEY *pkey, int indent, ASN1_PCTX *pctx); /* EVP_PKEY_print_private prints a textual representation of the private key in * |pkey| to |out|. Returns one on success or zero otherwise. */ OPENSSL_EXPORT int EVP_PKEY_print_private(BIO *out, const EVP_PKEY *pkey, int indent, ASN1_PCTX *pctx); /* EVP_PKEY_print_params prints a textual representation of the parameters in * |pkey| to |out|. Returns one on success or zero otherwise. */ OPENSSL_EXPORT int EVP_PKEY_print_params(BIO *out, const EVP_PKEY *pkey, int indent, ASN1_PCTX *pctx); /* Password stretching. * * Password stretching functions take a low-entropy password and apply a slow * function that results in a key suitable for use in symmetric * cryptography. */ /* PKCS5_PBKDF2_HMAC computes |iterations| iterations of PBKDF2 of |password| * and |salt|, using |digest|, and outputs |key_len| bytes to |out_key|. It * returns one on success and zero on error. */ OPENSSL_EXPORT int PKCS5_PBKDF2_HMAC(const char *password, size_t password_len, const uint8_t *salt, size_t salt_len, unsigned iterations, const EVP_MD *digest, size_t key_len, uint8_t *out_key); /* PKCS5_PBKDF2_HMAC_SHA1 is the same as PKCS5_PBKDF2_HMAC, but with |digest| * fixed to |EVP_sha1|. */ OPENSSL_EXPORT int PKCS5_PBKDF2_HMAC_SHA1(const char *password, size_t password_len, const uint8_t *salt, size_t salt_len, unsigned iterations, size_t key_len, uint8_t *out_key); /* Public key contexts. * * |EVP_PKEY_CTX| objects hold the context of an operation (e.g. signing or * encrypting) that uses a public key. */ /* EVP_PKEY_CTX_new allocates a fresh |EVP_PKEY_CTX| for use with |pkey|. It * returns the context or NULL on error. */ OPENSSL_EXPORT EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e); /* EVP_PKEY_CTX_new_id allocates a fresh |EVP_PKEY_CTX| for a key of type |id| * (e.g. |EVP_PKEY_HMAC|). This can be used for key generation where * |EVP_PKEY_CTX_new| can't be used because there isn't an |EVP_PKEY| to pass * it. It returns the context or NULL on error. */ OPENSSL_EXPORT EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e); /* EVP_PKEY_CTX_free frees |ctx| and the data it owns. */ OPENSSL_EXPORT void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx); /* EVP_PKEY_CTX_dup allocates a fresh |EVP_PKEY_CTX| and sets it equal to the * state of |ctx|. It returns the fresh |EVP_PKEY_CTX| or NULL on error. */ OPENSSL_EXPORT EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *ctx); /* EVP_PKEY_CTX_get0_pkey returns the |EVP_PKEY| associated with |ctx|. */ OPENSSL_EXPORT EVP_PKEY *EVP_PKEY_CTX_get0_pkey(EVP_PKEY_CTX *ctx); /* EVP_PKEY_sign_init initialises an |EVP_PKEY_CTX| for a signing operation. It * should be called before |EVP_PKEY_sign|. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_sign_init(EVP_PKEY_CTX *ctx); /* EVP_PKEY_sign signs |data_len| bytes from |data| using |ctx|. If |sig| is * NULL, the maximum size of the signature is written to * |out_sig_len|. Otherwise, |*sig_len| must contain the number of bytes of * space available at |sig|. If sufficient, the signature will be written to * |sig| and |*sig_len| updated with the true length. * * WARNING: Setting |sig| to NULL only gives the maximum size of the * signature. The actual signature may be smaller. * * It returns one on success or zero on error. (Note: this differs from * OpenSSL, which can also return negative values to indicate an error. ) */ OPENSSL_EXPORT int EVP_PKEY_sign(EVP_PKEY_CTX *ctx, uint8_t *sig, size_t *sig_len, const uint8_t *data, size_t data_len); /* EVP_PKEY_verify_init initialises an |EVP_PKEY_CTX| for a signature * verification operation. It should be called before |EVP_PKEY_verify|. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_verify_init(EVP_PKEY_CTX *ctx); /* EVP_PKEY_verify verifies that |sig_len| bytes from |sig| are a valid signature * for |data|. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_verify(EVP_PKEY_CTX *ctx, const uint8_t *sig, size_t sig_len, const uint8_t *data, size_t data_len); /* EVP_PKEY_encrypt_init initialises an |EVP_PKEY_CTX| for an encryption * operation. It should be called before |EVP_PKEY_encrypt|. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_encrypt_init(EVP_PKEY_CTX *ctx); /* EVP_PKEY_encrypt encrypts |in_len| bytes from |in|. If |out| is NULL, the * maximum size of the ciphertext is written to |out_len|. Otherwise, |*out_len| * must contain the number of bytes of space available at |out|. If sufficient, * the ciphertext will be written to |out| and |*out_len| updated with the true * length. * * WARNING: Setting |out| to NULL only gives the maximum size of the * ciphertext. The actual ciphertext may be smaller. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_encrypt(EVP_PKEY_CTX *ctx, uint8_t *out, size_t *out_len, const uint8_t *in, size_t in_len); /* EVP_PKEY_decrypt_init initialises an |EVP_PKEY_CTX| for a decryption * operation. It should be called before |EVP_PKEY_decrypt|. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx); /* EVP_PKEY_decrypt decrypts |in_len| bytes from |in|. If |out| is NULL, the * maximum size of the plaintext is written to |out_len|. Otherwise, |*out_len| * must contain the number of bytes of space available at |out|. If sufficient, * the ciphertext will be written to |out| and |*out_len| updated with the true * length. * * WARNING: Setting |out| to NULL only gives the maximum size of the * plaintext. The actual plaintext may be smaller. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx, uint8_t *out, size_t *out_len, const uint8_t *in, size_t in_len); /* EVP_PKEY_verify_recover_init initialises an |EVP_PKEY_CTX| for a public-key * decryption operation. It should be called before |EVP_PKEY_verify_recover|. * * Public-key decryption is a very obscure operation that is only implemented * by RSA keys. It is effectively a signature verification operation that * returns the signed message directly. It is almost certainly not what you * want. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_verify_recover_init(EVP_PKEY_CTX *ctx); /* EVP_PKEY_verify_recover decrypts |sig_len| bytes from |sig|. If |out| is * NULL, the maximum size of the plaintext is written to |out_len|. Otherwise, * |*out_len| must contain the number of bytes of space available at |out|. If * sufficient, the ciphertext will be written to |out| and |*out_len| updated * with the true length. * * WARNING: Setting |out| to NULL only gives the maximum size of the * plaintext. The actual plaintext may be smaller. * * See the warning about this operation in |EVP_PKEY_verify_recover_init|. It * is probably not what you want. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_verify_recover(EVP_PKEY_CTX *ctx, uint8_t *out, size_t *out_len, const uint8_t *sig, size_t siglen); /* EVP_PKEY_derive_init initialises an |EVP_PKEY_CTX| for a key derivation * operation. It should be called before |EVP_PKEY_derive_set_peer| and * |EVP_PKEY_derive|. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_derive_init(EVP_PKEY_CTX *ctx); /* EVP_PKEY_derive_set_peer sets the peer's key to be used for key derivation * by |ctx| to |peer|. It should be called after |EVP_PKEY_derive_init|. (For * example, this is used to set the peer's key in (EC)DH.) It returns one on * success and zero on error. */ OPENSSL_EXPORT int EVP_PKEY_derive_set_peer(EVP_PKEY_CTX *ctx, EVP_PKEY *peer); /* EVP_PKEY_derive derives a shared key between the two keys configured in * |ctx|. If |key| is non-NULL then, on entry, |out_key_len| must contain the * amount of space at |key|. If sufficient then the shared key will be written * to |key| and |*out_key_len| will be set to the length. If |key| is NULL then * |out_key_len| will be set to the maximum length. * * WARNING: Setting |out| to NULL only gives the maximum size of the key. The * actual key may be smaller. * * It returns one on success and zero on error. */ OPENSSL_EXPORT int EVP_PKEY_derive(EVP_PKEY_CTX *ctx, uint8_t *key, size_t *out_key_len); /* EVP_PKEY_keygen_init initialises an |EVP_PKEY_CTX| for a key generation * operation. It should be called before |EVP_PKEY_keygen|. * * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_keygen_init(EVP_PKEY_CTX *ctx); /* EVP_PKEY_keygen performs a key generation operation using the values from * |ctx| and sets |*ppkey| to a fresh |EVP_PKEY| containing the resulting key. * It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey); /* Generic control functions. */ /* EVP_PKEY_CTX_set_signature_md sets |md| as the digest to be used in a * signature operation. It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD *md); /* EVP_PKEY_CTX_get_signature_md sets |*out_md| to the digest to be used in a * signature operation. It returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_get_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD **out_md); /* RSA specific control functions. */ /* EVP_PKEY_CTX_set_rsa_padding sets the padding type to use. It should be one * of the |RSA_*_PADDING| values. Returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_padding(EVP_PKEY_CTX *ctx, int padding); /* EVP_PKEY_CTX_get_rsa_padding sets |*out_padding| to the current padding * value, which is one of the |RSA_*_PADDING| values. Returns one on success or * zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_padding(EVP_PKEY_CTX *ctx, int *out_padding); /* EVP_PKEY_CTX_set_rsa_pss_saltlen sets the length of the salt in a PSS-padded * signature. A value of -1 cause the salt to be the same length as the digest * in the signature. A value of -2 causes the salt to be the maximum length * that will fit. Otherwise the value gives the size of the salt in bytes. * * Returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int salt_len); /* EVP_PKEY_CTX_get_rsa_pss_saltlen sets |*out_salt_len| to the salt length of * a PSS-padded signature. See the documentation for * |EVP_PKEY_CTX_set_rsa_pss_saltlen| for details of the special values that it * can take. * * Returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int *out_salt_len); /* EVP_PKEY_CTX_set_rsa_keygen_bits sets the size of the desired RSA modulus, * in bits, for key generation. Returns one on success or zero on * error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_keygen_bits(EVP_PKEY_CTX *ctx, int bits); /* EVP_PKEY_CTX_set_rsa_keygen_pubexp sets |e| as the public exponent for key * generation. Returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_keygen_pubexp(EVP_PKEY_CTX *ctx, BIGNUM *e); /* EVP_PKEY_CTX_set_rsa_oaep_md sets |md| as the digest used in OAEP padding. * Returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD *md); /* EVP_PKEY_CTX_get_rsa_oaep_md sets |*out_md| to the digest function used in * OAEP padding. Returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD **out_md); /* EVP_PKEY_CTX_set_rsa_mgf1_md sets |md| as the digest used in MGF1. Returns * one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_set_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD *md); /* EVP_PKEY_CTX_get_rsa_mgf1_md sets |*out_md| to the digest function used in * MGF1. Returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_get_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD **out_md); /* EVP_PKEY_CTX_set0_rsa_oaep_label sets |label_len| bytes from |label| as the * label used in OAEP. DANGER: On success, this call takes ownership of |label| * and will call |OPENSSL_free| on it when |ctx| is destroyed. * * Returns one on success or zero on error. */ OPENSSL_EXPORT int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx, uint8_t *label, size_t label_len); /* EVP_PKEY_CTX_get0_rsa_oaep_label sets |*out_label| to point to the internal * buffer containing the OAEP label (which may be NULL) and returns the length * of the label or a negative value on error. * * WARNING: the return value differs from the usual return value convention. */ OPENSSL_EXPORT int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx, const uint8_t **out_label); /* Deprecated functions. */ /* EVP_PKEY_DH is defined for compatibility, but it is impossible to create an * |EVP_PKEY| of that type. */ #define EVP_PKEY_DH NID_dhKeyAgreement /* EVP_PKEY_RSA2 was historically an alternate form for RSA public keys (OID * 2.5.8.1.1), but is no longer accepted. */ #define EVP_PKEY_RSA2 NID_rsa /* OpenSSL_add_all_algorithms does nothing. */ OPENSSL_EXPORT void OpenSSL_add_all_algorithms(void); /* OpenSSL_add_all_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); /* Private functions */ /* EVP_PKEY_asn1_find returns the ASN.1 method table for the given |nid|, which * should be one of the |EVP_PKEY_*| values. It returns NULL if |nid| is * unknown. */ OPENSSL_EXPORT const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find(ENGINE **pengine, int nid); /* EVP_PKEY_asn1_find_str returns an |EVP_PKEY_ASN1_METHOD| by matching values * of the |len| bytes at |name|. For example, if name equals "EC" then it will * return an ECC method. The |pengine| argument is ignored. * * TODO(fork): move to PEM? */ OPENSSL_EXPORT const EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_find_str( ENGINE **pengine, const char *name, size_t len); struct evp_pkey_st { CRYPTO_refcount_t references; /* type contains one of the EVP_PKEY_* values or NID_undef and determines * which element (if any) of the |pkey| union is valid. */ int type; union { char *ptr; RSA *rsa; DSA *dsa; DH *dh; EC_KEY *ec; } pkey; /* ameth contains a pointer to a method table that contains many ASN.1 * methods for the key type. */ const EVP_PKEY_ASN1_METHOD *ameth; } /* EVP_PKEY */; #if defined(__cplusplus) } /* extern C */ #endif #define EVP_R_BUFFER_TOO_SMALL 100 #define EVP_R_COMMAND_NOT_SUPPORTED 101 #define EVP_R_DIFFERENT_KEY_TYPES 104 #define EVP_R_DIFFERENT_PARAMETERS 105 #define EVP_R_EXPECTING_AN_EC_KEY_KEY 107 #define EVP_R_EXPECTING_A_DH_KEY 109 #define EVP_R_EXPECTING_A_DSA_KEY 110 #define EVP_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE 111 #define EVP_R_INVALID_CURVE 112 #define EVP_R_INVALID_DIGEST_LENGTH 113 #define EVP_R_INVALID_DIGEST_TYPE 114 #define EVP_R_INVALID_KEYBITS 115 #define EVP_R_INVALID_MGF1_MD 116 #define EVP_R_INVALID_PADDING_MODE 118 #define EVP_R_INVALID_PSS_PARAMETERS 119 #define EVP_R_INVALID_SALT_LENGTH 121 #define EVP_R_INVALID_TRAILER 122 #define EVP_R_KEYS_NOT_SET 123 #define EVP_R_MISSING_PARAMETERS 124 #define EVP_R_NO_DEFAULT_DIGEST 125 #define EVP_R_NO_KEY_SET 126 #define EVP_R_NO_MDC2_SUPPORT 127 #define EVP_R_NO_NID_FOR_CURVE 128 #define EVP_R_NO_OPERATION_SET 129 #define EVP_R_NO_PARAMETERS_SET 130 #define EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE 131 #define EVP_R_OPERATON_NOT_INITIALIZED 132 #define EVP_R_UNKNOWN_DIGEST 133 #define EVP_R_UNKNOWN_MASK_DIGEST 134 #define EVP_R_UNSUPPORTED_ALGORITHM 138 #define EVP_R_UNSUPPORTED_MASK_ALGORITHM 139 #define EVP_R_UNSUPPORTED_MASK_PARAMETER 140 #define EVP_R_EXPECTING_AN_RSA_KEY 141 #define EVP_R_INVALID_OPERATION 142 #define EVP_R_DECODE_ERROR 143 #define EVP_R_INVALID_PSS_SALTLEN 144 #define EVP_R_UNKNOWN_PUBLIC_KEY_TYPE 145 #define EVP_R_CONTEXT_NOT_INITIALISED 146 #define EVP_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED 147 #define EVP_R_WRONG_PUBLIC_KEY_TYPE 148 #define EVP_R_UNKNOWN_SIGNATURE_ALGORITHM 149 #define EVP_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM 150 #define EVP_R_BN_DECODE_ERROR 151 #define EVP_R_PARAMETER_ENCODING_ERROR 152 #define EVP_R_UNSUPPORTED_PUBLIC_KEY_TYPE 153 #define EVP_R_UNSUPPORTED_SIGNATURE_TYPE 154 #endif /* OPENSSL_HEADER_EVP_H */