add support for DSA with SHA2
[openssl.git] / crypto / dsa / dsa_pmeth.c
index bd4ee72..935258b 100644 (file)
 #include "cryptlib.h"
 #include <openssl/asn1t.h>
 #include <openssl/x509.h>
-#include <openssl/rsa.h>
 #include <openssl/evp.h>
 #include "evp_locl.h"
+#include "dsa_locl.h"
 
 /* DSA pkey context structure */
 
 typedef struct
        {
        /* Parameter gen parameters */
-       int nbits;
+       int nbits;              /* size of p in bits (default: 1024) */
+       int qbits;              /* size of q in bits (default: 160)  */
+       const EVP_MD *pmd;      /* MD for parameter generation */
        /* Keygen callback info */
        int gentmp[2];
        /* message digest */
-       const EVP_MD *md;
+       const EVP_MD *md;       /* MD for the signature */
        } DSA_PKEY_CTX;
 
 static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
@@ -82,6 +84,8 @@ static int pkey_dsa_init(EVP_PKEY_CTX *ctx)
        if (!dctx)
                return 0;
        dctx->nbits = 1024;
+       dctx->qbits = 160;
+       dctx->pmd = NULL;
        dctx->md = NULL;
 
        ctx->data = dctx;
@@ -99,7 +103,9 @@ static int pkey_dsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
                sctx = src->data;
        dctx = dst->data;
        dctx->nbits = sctx->nbits;
-       dctx->md = sctx->md;
+       dctx->qbits = sctx->qbits;
+       dctx->pmd = sctx->pmd;
+       dctx->md  = sctx->md;
        return 1;
        }
 
@@ -160,8 +166,27 @@ static int pkey_dsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
                dctx->nbits = p1;
                return 1;
 
+               case EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS:
+               if (p1 != 160 && p1 != 224 && p1 && p1 != 256)
+                       return -2;
+               dctx->qbits = p1;
+               return 1;
+
+               case EVP_PKEY_CTRL_DSA_PARAMGEN_MD:
+               if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1   &&
+                   EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
+                   EVP_MD_type((const EVP_MD *)p2) != NID_sha256)
+                       {
+                       DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
+                       return 0;
+                       }
+               dctx->md = p2;
+               return 1;
+
                case EVP_PKEY_CTRL_MD:
-               if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1)
+               if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1   &&
+                   EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
+                   EVP_MD_type((const EVP_MD *)p2) != NID_sha256)
                        {
                        DSAerr(DSA_F_PKEY_DSA_CTRL, DSA_R_INVALID_DIGEST_TYPE);
                        return 0;
@@ -187,6 +212,18 @@ static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
                nbits = atoi(value);
                return EVP_PKEY_CTX_set_dsa_paramgen_bits(ctx, nbits);
                }
+       if (!strcmp(type, "dsa_paramgen_q_bits"))
+               {
+               int qbits = atoi(value);
+               return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
+                                        EVP_PKEY_CTRL_DSA_PARAMGEN_Q_BITS, qbits, NULL);
+               }
+       if (!strcmp(type, "dsa_paramgen_md"))
+               {
+               return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
+                                        EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0, 
+                                        (void *)EVP_get_digestbyname(value));
+               }
        return -2;
        }
 
@@ -206,8 +243,8 @@ static int pkey_dsa_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
        dsa = DSA_new();
        if (!dsa)
                return 0;
-       ret = DSA_generate_parameters_ex(dsa, dctx->nbits, NULL, 0, NULL, NULL,
-                                                                       pcb);
+       ret = dsa_builtin_paramgen(dsa, dctx->nbits, dctx->qbits, dctx->pmd,
+                                  NULL, 0, NULL, NULL, pcb);
        if (ret)
                EVP_PKEY_assign_DSA(pkey, dsa);
        else