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Diffstat (limited to 'src/crypto/dsa/dsa.c')
-rw-r--r-- | src/crypto/dsa/dsa.c | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/src/crypto/dsa/dsa.c b/src/crypto/dsa/dsa.c new file mode 100644 index 0000000..8816b63 --- /dev/null +++ b/src/crypto/dsa/dsa.c @@ -0,0 +1,354 @@ +/* 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>. */ + +#include <openssl/dsa.h> + +#include <string.h> + +#include <openssl/asn1.h> +#include <openssl/dh.h> +#include <openssl/engine.h> +#include <openssl/err.h> +#include <openssl/ex_data.h> +#include <openssl/mem.h> + +#include "internal.h" + + +extern const DSA_METHOD DSA_default_method; + +DSA *DSA_new(void) { return DSA_new_method(NULL); } + +DSA *DSA_new_method(const ENGINE *engine) { + DSA *dsa = (DSA *)OPENSSL_malloc(sizeof(DSA)); + if (dsa == NULL) { + OPENSSL_PUT_ERROR(DSA, DSA_new_method, ERR_R_MALLOC_FAILURE); + return NULL; + } + + memset(dsa, 0, sizeof(DSA)); + + if (engine) { + dsa->meth = ENGINE_get_DSA_method(engine); + } + + if (dsa->meth == NULL) { + dsa->meth = (DSA_METHOD*) &DSA_default_method; + } + METHOD_ref(dsa->meth); + + dsa->write_params = 1; + dsa->references = 1; + + if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data)) { + METHOD_unref(dsa->meth); + OPENSSL_free(dsa); + return NULL; + } + + if (dsa->meth->init && !dsa->meth->init(dsa)) { + CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data); + METHOD_unref(dsa->meth); + OPENSSL_free(dsa); + return NULL; + } + + return dsa; +} + +void DSA_free(DSA *dsa) { + if (dsa == NULL) { + return; + } + + if (CRYPTO_add(&dsa->references, -1, CRYPTO_LOCK_DSA) > 0) { + return; + } + + if (dsa->meth->finish) { + dsa->meth->finish(dsa); + } + METHOD_unref(dsa->meth); + + CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, dsa, &dsa->ex_data); + + if (dsa->p != NULL) + BN_clear_free(dsa->p); + if (dsa->q != NULL) + BN_clear_free(dsa->q); + if (dsa->g != NULL) + BN_clear_free(dsa->g); + if (dsa->pub_key != NULL) + BN_clear_free(dsa->pub_key); + if (dsa->priv_key != NULL) + BN_clear_free(dsa->priv_key); + if (dsa->kinv != NULL) + BN_clear_free(dsa->kinv); + if (dsa->r != NULL) + BN_clear_free(dsa->r); + OPENSSL_free(dsa); +} + +int DSA_up_ref(DSA *dsa) { + CRYPTO_add(&dsa->references, 1, CRYPTO_LOCK_DSA); + return 1; +} + +int DSA_generate_parameters_ex(DSA *dsa, unsigned bits, const uint8_t *seed_in, + size_t seed_len, int *out_counter, + unsigned long *out_h, BN_GENCB *cb) { + if (dsa->meth->generate_parameters) { + return dsa->meth->generate_parameters(dsa, bits, seed_in, seed_len, + out_counter, out_h, cb); + } + return DSA_default_method.generate_parameters(dsa, bits, seed_in, seed_len, + out_counter, out_h, cb); +} + +int DSA_generate_key(DSA *dsa) { + if (dsa->meth->keygen) { + return dsa->meth->keygen(dsa); + } + return DSA_default_method.keygen(dsa); +} + +DSA_SIG *DSA_SIG_new(void) { + DSA_SIG *sig; + sig = OPENSSL_malloc(sizeof(DSA_SIG)); + if (!sig) { + return NULL; + } + sig->r = NULL; + sig->s = NULL; + return sig; +} + +void DSA_SIG_free(DSA_SIG *sig) { + if (!sig) { + return; + } + + if (sig->r) { + BN_free(sig->r); + } + if (sig->s) { + BN_free(sig->s); + } + OPENSSL_free(sig); +} + +DSA_SIG *DSA_do_sign(const uint8_t *digest, size_t digest_len, DSA *dsa) { + if (dsa->meth->sign) { + return dsa->meth->sign(digest, digest_len, dsa); + } + return DSA_default_method.sign(digest, digest_len, dsa); +} + +int DSA_do_verify(const uint8_t *digest, size_t digest_len, DSA_SIG *sig, + const DSA *dsa) { + int valid; + if (!DSA_do_check_signature(&valid, digest, digest_len, sig, dsa)) { + return -1; + } + return valid; +} + +int DSA_do_check_signature(int *out_valid, const uint8_t *digest, + size_t digest_len, DSA_SIG *sig, const DSA *dsa) { + if (dsa->meth->verify) { + return dsa->meth->verify(out_valid, digest, digest_len, sig, dsa); + } + + return DSA_default_method.verify(out_valid, digest, digest_len, sig, dsa); +} + +int DSA_sign(int type, const uint8_t *digest, size_t digest_len, + uint8_t *out_sig, unsigned int *out_siglen, DSA *dsa) { + DSA_SIG *s; + + s = DSA_do_sign(digest, digest_len, dsa); + if (s == NULL) { + *out_siglen = 0; + return 0; + } + + *out_siglen = i2d_DSA_SIG(s, &out_sig); + DSA_SIG_free(s); + return 1; +} + +int DSA_verify(int type, const uint8_t *digest, size_t digest_len, + const uint8_t *sig, size_t sig_len, const DSA *dsa) { + int valid; + if (!DSA_check_signature(&valid, digest, digest_len, sig, sig_len, dsa)) { + return -1; + } + return valid; +} + +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_SIG *s = NULL; + int ret = 0; + uint8_t *der = NULL; + + s = DSA_SIG_new(); + if (s == NULL) { + goto err; + } + + const uint8_t *sigp = sig; + if (d2i_DSA_SIG(&s, &sigp, sig_len) == NULL || sigp != sig + sig_len) { + goto err; + } + + /* Ensure that the signature uses DER and doesn't have trailing garbage. */ + int der_len = i2d_DSA_SIG(s, &der); + if (der_len < 0 || (size_t)der_len != sig_len || memcmp(sig, der, sig_len)) { + goto err; + } + + ret = DSA_do_check_signature(out_valid, digest, digest_len, s, dsa); + +err: + if (der != NULL) { + OPENSSL_free(der); + } + if (s) { + DSA_SIG_free(s); + } + return ret; +} + +int DSA_size(const DSA *dsa) { + int ret, i; + ASN1_INTEGER bs; + unsigned char buf[4]; /* 4 bytes looks really small. + However, i2d_ASN1_INTEGER() will not look + beyond the first byte, as long as the second + parameter is NULL. */ + + i = BN_num_bits(dsa->q); + bs.length = (i + 7) / 8; + bs.data = buf; + bs.type = V_ASN1_INTEGER; + /* If the top bit is set the asn1 encoding is 1 larger. */ + buf[0] = 0xff; + + i = i2d_ASN1_INTEGER(&bs, NULL); + i += i; /* r and s */ + ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); + return ret; +} + +int DSA_sign_setup(const DSA *dsa, BN_CTX *ctx, BIGNUM **out_kinv, + BIGNUM **out_r) { + if (dsa->meth->sign_setup) { + return dsa->meth->sign_setup(dsa, ctx, out_kinv, out_r, NULL, 0); + } + + return DSA_default_method.sign_setup(dsa, ctx, out_kinv, out_r, NULL, 0); +} + +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) { + return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DSA, argl, argp, new_func, + dup_func, free_func); +} + +int DSA_set_ex_data(DSA *d, int idx, void *arg) { + return CRYPTO_set_ex_data(&d->ex_data, idx, arg); +} + +void *DSA_get_ex_data(const DSA *d, int idx) { + return CRYPTO_get_ex_data(&d->ex_data, idx); +} + +DH *DSA_dup_DH(const DSA *r) { + DH *ret = NULL; + + if (r == NULL) { + goto err; + } + ret = DH_new(); + if (ret == NULL) { + goto err; + } + if (r->q != NULL) { + ret->priv_length = BN_num_bits(r->q); + if ((ret->q = BN_dup(r->q)) == NULL) { + goto err; + } + } + if ((r->p != NULL && (ret->p = BN_dup(r->p)) == NULL) || + (r->g != NULL && (ret->g = BN_dup(r->g)) == NULL) || + (r->pub_key != NULL && (ret->pub_key = BN_dup(r->pub_key)) == NULL) || + (r->priv_key != NULL && (ret->priv_key = BN_dup(r->priv_key)) == NULL)) { + goto err; + } + + return ret; + +err: + if (ret != NULL) { + DH_free(ret); + } + return NULL; +} |