| /* 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.] |
| * |
| * The DSS routines are based on patches supplied by |
| * Steven Schoch <schoch@sheba.arc.nasa.gov>. */ |
| |
| #ifndef OPENSSL_HEADER_DSA_H |
| #define OPENSSL_HEADER_DSA_H |
| |
| #include <openssl/base.h> |
| |
| #include <openssl/engine.h> |
| #include <openssl/ex_data.h> |
| |
| #if defined(__cplusplus) |
| extern "C" { |
| #endif |
| |
| |
| /* DSA contains functions for signing and verifing with the Digital Signature |
| * Algorithm. */ |
| |
| |
| /* Allocation and destruction. */ |
| |
| /* DSA_new returns a new, empty DSA object or NULL on error. */ |
| DSA *DSA_new(void); |
| |
| /* DSA_new_method acts the same as |DH_new| but takes an explicit |ENGINE|. */ |
| DSA *DSA_new_method(const ENGINE *engine); |
| |
| /* DSA_free decrements the reference count of |dsa| and frees it if the |
| * reference count drops to zero. */ |
| void DSA_free(DSA *dsa); |
| |
| /* DSA_up_ref increments the reference count of |dsa|. */ |
| int DSA_up_ref(DSA *dsa); |
| |
| |
| /* Parameter generation. */ |
| |
| /* DSA_generate_parameters_ex generates a set of DSA parameters by following |
| * the procedure given in FIPS 186-4, appendix A. |
| * (http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf) |
| * |
| * The larger prime will have a length of |bits| (e.g. 2048). The |seed| value |
| * allows others to generate and verify the same parameters and should be |
| * random input which is kept for reference. If |out_counter| or |out_h| are |
| * not NULL then the counter and h value used in the generation are written to |
| * them. |
| * |
| * The |cb| argument is passed to |BN_generate_prime_ex| and is thus called |
| * during the generation process in order to indicate progress. See the |
| * comments for that function for details. In addition to the calls made by |
| * |BN_generate_prime_ex|, |DSA_generate_parameters_ex| will call it with |
| * |event| equal to 2 and 3 at different stages of the process. |
| * |
| * It returns one on success and zero otherwise. */ |
| int DSA_generate_parameters_ex(DSA *dsa, unsigned bits, const uint8_t *seed, |
| size_t seed_len, int *out_counter, |
| unsigned long *out_h, BN_GENCB *cb); |
| |
| /* DSAparams_dup returns a freshly allocated |DSA| that contains a copy of the |
| * parameters from |dsa|. It returns NULL on error. */ |
| DSA *DSAparams_dup(const DSA *dsa); |
| |
| |
| /* Key generation. */ |
| |
| /* DSA_generate_key generates a public/private key pair in |dsa|, which must |
| * already have parameters setup. It returns one on success and zero on |
| * error. */ |
| int DSA_generate_key(DSA *dsa); |
| |
| |
| /* Signatures. */ |
| |
| /* DSA_SIG contains a DSA signature as a pair of integers. */ |
| typedef struct DSA_SIG_st { |
| BIGNUM *r, *s; |
| } DSA_SIG; |
| |
| /* DSA_SIG_new returns a freshly allocated, DIG_SIG structure or NULL on error. |
| * Both |r| and |s| in the signature will be NULL. */ |
| DSA_SIG *DSA_SIG_new(void); |
| |
| /* DSA_SIG_free frees the contents of |sig| and then frees |sig| itself. */ |
| void DSA_SIG_free(DSA_SIG *sig); |
| |
| /* DSA_do_sign returns a signature of the hash in |digest| by the key in |dsa| |
| * and returns an allocated, DSA_SIG structure, or NULL on error. */ |
| DSA_SIG *DSA_do_sign(const uint8_t *digest, size_t digest_len, DSA *dsa); |
| |
| /* DSA_do_verify verifies that |sig| is a valid signature, by the public key in |
| * |dsa|, of the hash in |digest|. It returns one if so, zero if invalid and -1 |
| * on error. |
| * |
| * WARNING: do not use. This function returns -1 for error, 0 for invalid and 1 |
| * for valid. However, this is dangerously different to the usual OpenSSL |
| * convention and could be a disaster if a user did |if (DSA_do_verify(...))|. |
| * Because of this, |DSA_check_signature| is a safer version of this. |
| * |
| * TODO(fork): deprecate. */ |
| int DSA_do_verify(const uint8_t *digest, size_t digest_len, DSA_SIG *sig, |
| const DSA *dsa); |
| |
| /* DSA_check_signature sets |*out_valid| to zero. Then it verifies that |sig| |
| * is a valid signature, by the public key in |dsa| of the hash in |digest| |
| * and, if so, it sets |*out_valid| to one. |
| * |
| * It returns one if it was able to verify the signature as valid or invalid, |
| * and zero on error. */ |
| int DSA_do_check_signature(int *out_valid, const uint8_t *digest, |
| size_t digest_len, DSA_SIG *sig, const DSA *dsa); |
| |
| |
| /* ASN.1 signatures. |
| * |
| * These functions also perform DSA signature operations, but deal with ASN.1 |
| * encoded signatures as opposed to raw |BIGNUM|s. If you don't know what |
| * encoding a DSA signature is in, it's probably ASN.1. */ |
| |
| /* DSA_sign signs |digest| with the key in |dsa| and writes the resulting |
| * signature, in ASN.1 form, to |out_sig| and the length of the signature to |
| * |*out_siglen|. There must be, at least, |DSA_size(dsa)| bytes of space in |
| * |out_sig|. It returns one on success and zero otherwise. |
| * |
| * (The |type| argument is ignored.) */ |
| int DSA_sign(int type, const uint8_t *digest, size_t digest_len, |
| uint8_t *out_sig, unsigned int *out_siglen, DSA *dsa); |
| |
| /* DSA_verify verifies that |sig| is a valid, ASN.1 signature, by the public |
| * key in |dsa|, of the hash in |digest|. It returns one if so, zero if invalid |
| * and -1 on error. |
| * |
| * (The |type| argument is ignored.) |
| * |
| * WARNING: do not use. This function returns -1 for error, 0 for invalid and 1 |
| * for valid. However, this is dangerously different to the usual OpenSSL |
| * convention and could be a disaster if a user did |if (DSA_do_verify(...))|. |
| * Because of this, |DSA_check_signature| is a safer version of this. |
| * |
| * TODO(fork): deprecate. */ |
| int DSA_verify(int type, const uint8_t *digest, size_t digest_len, |
| const uint8_t *sig, size_t sig_len, const DSA *dsa); |
| |
| /* DSA_check_signature sets |*out_valid| to zero. Then it verifies that |sig| |
| * is a valid, ASN.1 signature, by the public key in |dsa|, of the hash in |
| * |digest|. If so, it sets |*out_valid| to one. |
| * |
| * It returns one if it was able to verify the signature as valid or invalid, |
| * and zero on error. */ |
| int DSA_check_signature(int *out_valid, const uint8_t *digest, |
| size_t digest_len, const uint8_t *sig, size_t sig_len, |
| const DSA *dsa); |
| |
| /* DSA_size returns the size, in bytes, of an ASN.1 encoded, DSA signature |
| * generated by |dsa|. Parameters must already have been setup in |dsa|. */ |
| int DSA_size(const DSA *dsa); |
| |
| |
| /* ASN.1 encoding. */ |
| |
| /* d2i_DSA_SIG parses an ASN.1, DER-encoded, DSA signature from |len| bytes at |
| * |*inp|. If |out_sig| is not NULL then, on exit, a pointer to the result is |
| * in |*out_sig|. If |*out_sig| is already non-NULL on entry then the result is |
| * written directly into |*out_sig|, otherwise a fresh |DSA_SIG| is allocated. |
| * On successful exit, |*inp| is advanced past the DER structure. It returns |
| * the result or NULL on error. */ |
| DSA_SIG *d2i_DSA_SIG(DSA_SIG **out_sig, const uint8_t **inp, long len); |
| |
| /* i2d_DSA_SIG 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. */ |
| int i2d_DSA_SIG(const DSA_SIG *in, uint8_t **outp); |
| |
| /* d2i_DSAPublicKey parses an ASN.1, DER-encoded, DSA public 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 |DSA| is allocated. On |
| * successful exit, |*inp| is advanced past the DER structure. It returns the |
| * result or NULL on error. */ |
| DSA *d2i_DSAPublicKey(DSA **out, const uint8_t **inp, long len); |
| |
| /* i2d_DSAPublicKey marshals a public key from |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. */ |
| int i2d_DSAPublicKey(const DSA *in, unsigned char **outp); |
| |
| /* d2i_DSAPrivateKey parses an ASN.1, DER-encoded, DSA 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 |DSA| is allocated. On |
| * successful exit, |*inp| is advanced past the DER structure. It returns the |
| * result or NULL on error. */ |
| DSA *d2i_DSAPrivateKey(DSA **out, const uint8_t **inp, long len); |
| |
| /* i2d_DSAPrivateKey marshals a private key from |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. */ |
| int i2d_DSAPrivateKey(const DSA *in, unsigned char **outp); |
| |
| /* d2i_DSAparams parses ASN.1, DER-encoded, DSA parameters 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 |DSA| is allocated. On successful |
| * exit, |*inp| is advanced past the DER structure. It returns the result or |
| * NULL on error. */ |
| DSA *d2i_DSAparams(DSA **out, const uint8_t **inp, long len); |
| |
| /* i2d_DSAparams marshals DSA parameters from |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. */ |
| int i2d_DSAparams(const DSA *in, unsigned char **outp); |
| |
| |
| /* Precomputation. */ |
| |
| /* DSA_sign_setup precomputes the message independent part of the DSA signature |
| * and writes them to |*out_kinv| and |*out_r|. Returns one on success, zero on |
| * error. |
| * |
| * TODO(fork): decide what to do with this. Since making DSA* opaque there's no |
| * way for the user to install them. Also, it forces the DSA* not to be const |
| * when passing to the signing function. */ |
| int DSA_sign_setup(const DSA *dsa, BN_CTX *ctx, BIGNUM **out_kinv, |
| BIGNUM **out_r); |
| |
| |
| /* ex_data functions. |
| * |
| * These functions are wrappers. See |ex_data.h| for details. */ |
| |
| int DSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, |
| CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func); |
| int DSA_set_ex_data(DSA *d, int idx, void *arg); |
| void *DSA_get_ex_data(const DSA *d, int idx); |
| |
| |
| struct dsa_method { |
| struct openssl_method_common_st common; |
| |
| void *app_data; |
| |
| int (*init)(DSA *dsa); |
| int (*finish)(DSA *dsa); |
| |
| DSA_SIG *(*sign)(const uint8_t *digest, size_t digest_len, DSA *dsa); |
| |
| int (*sign_setup)(const DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp, BIGNUM **rp, |
| const uint8_t *digest, size_t digest_len); |
| |
| int (*verify)(int *out_valid, const uint8_t *digest, size_t digest_len, |
| DSA_SIG *sig, const DSA *dsa); |
| |
| /* generate_parameters, if non-NULL, is used to generate DSA parameters. */ |
| int (*generate_parameters)(DSA *dsa, unsigned bits, const uint8_t *seed, |
| size_t seed_len, int *counter_ret, |
| unsigned long *h_ret, BN_GENCB *cb); |
| |
| /* keygen, if non-NULL, is used to generate DSA keys. */ |
| int (*keygen)(DSA *dsa); |
| }; |
| |
| struct dsa_st { |
| long version; |
| int write_params; |
| BIGNUM *p; |
| BIGNUM *q; /* == 20 */ |
| BIGNUM *g; |
| |
| BIGNUM *pub_key; /* y public key */ |
| BIGNUM *priv_key; /* x private key */ |
| |
| BIGNUM *kinv; /* Signing pre-calc */ |
| BIGNUM *r; /* Signing pre-calc */ |
| |
| int flags; |
| /* Normally used to cache montgomery values */ |
| BN_MONT_CTX *method_mont_p; |
| int references; |
| CRYPTO_EX_DATA ex_data; |
| DSA_METHOD *meth; |
| /* functional reference if 'meth' is ENGINE-provided */ |
| ENGINE *engine; |
| }; |
| |
| |
| #if defined(__cplusplus) |
| } /* extern C */ |
| #endif |
| |
| #define DSA_F_sign 100 |
| #define DSA_F_verify 101 |
| #define DSA_F_dsa_sig_cb 102 |
| #define DSA_F_DSA_new_method 103 |
| #define DSA_F_sign_setup 104 |
| #define DSA_R_NEED_NEW_SETUP_VALUES 100 |
| #define DSA_R_BAD_Q_VALUE 101 |
| #define DSA_R_MODULUS_TOO_LARGE 102 |
| #define DSA_R_MISSING_PARAMETERS 103 |
| |
| #endif /* OPENSSL_HEADER_DSA_H */ |