1 files changed, 113 insertions, 0 deletions

diff --git a/src/lib/libcrypto/doc/dsa.pod b/src/lib/libcrypto/doc/dsa.pod
new file mode 100644
index 0000000000..ae2e5d81f9
--- /dev/null
+++ b/src/lib/libcrypto/doc/dsa.pod
@@ -0,0 +1,113 @@
+=pod
+
+=head1 NAME
+
+dsa - Digital Signature Algorithm
+
+=head1 SYNOPSIS
+
+ #include <openssl/dsa.h>
+ #include <openssl/engine.h>
+
+ DSA *  DSA_new(void);
+ void   DSA_free(DSA *dsa);
+
+ int    DSA_size(const DSA *dsa);
+
+ DSA *  DSA_generate_parameters(int bits, unsigned char *seed,
+                int seed_len, int *counter_ret, unsigned long *h_ret,
+                void (*callback)(int, int, void *), void *cb_arg);
+
+ DH *   DSA_dup_DH(const DSA *r);
+
+ int    DSA_generate_key(DSA *dsa);
+
+ int    DSA_sign(int dummy, const unsigned char *dgst, int len,
+                unsigned char *sigret, unsigned int *siglen, DSA *dsa);
+ int    DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
+                BIGNUM **rp);
+ int    DSA_verify(int dummy, const unsigned char *dgst, int len,
+                const unsigned char *sigbuf, int siglen, DSA *dsa);
+
+ void DSA_set_default_method(const DSA_METHOD *meth);
+ const DSA_METHOD *DSA_get_default_method(void);
+ int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);
+ DSA *DSA_new_method(ENGINE *engine);
+ const DSA_METHOD *DSA_OpenSSL(void);
+
+ int DSA_get_ex_new_index(long argl, char *argp, int (*new_func)(),
+             int (*dup_func)(), void (*free_func)());
+ int DSA_set_ex_data(DSA *d, int idx, char *arg);
+ char *DSA_get_ex_data(DSA *d, int idx);
+
+ DSA_SIG *DSA_SIG_new(void);
+ void   DSA_SIG_free(DSA_SIG *a);
+ int    i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
+ DSA_SIG *d2i_DSA_SIG(DSA_SIG **v, unsigned char **pp, long length);
+
+ DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);
+ int    DSA_do_verify(const unsigned char *dgst, int dgst_len,
+             DSA_SIG *sig, DSA *dsa);
+
+ DSA *  d2i_DSAPublicKey(DSA **a, unsigned char **pp, long length);
+ DSA *  d2i_DSAPrivateKey(DSA **a, unsigned char **pp, long length);
+ DSA *  d2i_DSAparams(DSA **a, unsigned char **pp, long length);
+ int    i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
+ int    i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
+ int    i2d_DSAparams(const DSA *a,unsigned char **pp);
+
+ int    DSAparams_print(BIO *bp, const DSA *x);
+ int    DSAparams_print_fp(FILE *fp, const DSA *x);
+ int    DSA_print(BIO *bp, const DSA *x, int off);
+ int    DSA_print_fp(FILE *bp, const DSA *x, int off);
+
+=head1 DESCRIPTION
+
+These functions implement the Digital Signature Algorithm (DSA).  The
+generation of shared DSA parameters is described in
+L<DSA_generate_parameters(3)|DSA_generate_parameters(3)>;
+L<DSA_generate_key(3)|DSA_generate_key(3)> describes how to
+generate a signature key. Signature generation and verification are
+described in L<DSA_sign(3)|DSA_sign(3)>.
+
+The B<DSA> structure consists of several BIGNUM components.
+
+ struct
+        {
+        BIGNUM *p;              // prime number (public)
+        BIGNUM *q;              // 160-bit subprime, q | p-1 (public)
+        BIGNUM *g;              // generator of subgroup (public)
+        BIGNUM *priv_key;       // private key x
+        BIGNUM *pub_key;        // public key y = g^x
+        // ...
+        }
+ DSA;
+
+In public keys, B<priv_key> is NULL.
+
+Note that DSA keys may use non-standard B<DSA_METHOD> implementations,
+either directly or by the use of B<ENGINE> modules. In some cases (eg. an
+ENGINE providing support for hardware-embedded keys), these BIGNUM values
+will not be used by the implementation or may be used for alternative data
+storage. For this reason, applications should generally avoid using DSA
+structure elements directly and instead use API functions to query or
+modify keys.
+
+=head1 CONFORMING TO
+
+US Federal Information Processing Standard FIPS 186 (Digital Signature
+Standard, DSS), ANSI X9.30
+
+=head1 SEE ALSO
+
+L<bn(3)|bn(3)>, L<dh(3)|dh(3)>, L<err(3)|err(3)>, L<rand(3)|rand(3)>,
+L<rsa(3)|rsa(3)>, L<SHA1(3)|SHA1(3)>, L<DSA_new(3)|DSA_new(3)>,
+L<DSA_size(3)|DSA_size(3)>,
+L<DSA_generate_parameters(3)|DSA_generate_parameters(3)>,
+L<DSA_dup_DH(3)|DSA_dup_DH(3)>,
+L<DSA_generate_key(3)|DSA_generate_key(3)>,
+L<DSA_sign(3)|DSA_sign(3)>, L<DSA_set_method(3)|DSA_set_method(3)>,
+L<DSA_get_ex_new_index(3)|DSA_get_ex_new_index(3)>,
+L<RSA_print(3)|RSA_print(3)>
+
+=cut