diff --git a/crypto/evp/CMakeLists.txt b/crypto/evp/CMakeLists.txt
index 3b97ba6..3dd1958 100644
--- a/crypto/evp/CMakeLists.txt
+++ b/crypto/evp/CMakeLists.txt
@@ -10,6 +10,7 @@
   digestsign.c
   evp.c
   evp_ctx.c
+  p_dsa_asn1.c
   p_ec.c
   p_ec_asn1.c
   p_hmac.c
diff --git a/crypto/evp/evp.c b/crypto/evp/evp.c
index 49dbd79..64ffed6 100644
--- a/crypto/evp/evp.c
+++ b/crypto/evp/evp.c
@@ -71,6 +71,7 @@
 #include "internal.h"
 
 
+extern const EVP_PKEY_ASN1_METHOD dsa_asn1_meth;
 extern const EVP_PKEY_ASN1_METHOD ec_asn1_meth;
 extern const EVP_PKEY_ASN1_METHOD hmac_asn1_meth;
 extern const EVP_PKEY_ASN1_METHOD rsa_asn1_meth;
@@ -208,6 +209,8 @@
       return &hmac_asn1_meth;
     case EVP_PKEY_EC:
       return &ec_asn1_meth;
+    case EVP_PKEY_DSA:
+      return &dsa_asn1_meth;
     default:
       return NULL;
   }
diff --git a/crypto/evp/evp_test.cc b/crypto/evp/evp_test.cc
index e2deed7..a63f087 100644
--- a/crypto/evp/evp_test.cc
+++ b/crypto/evp/evp_test.cc
@@ -86,6 +86,81 @@
     0x2d, 0x86, 0x9d, 0xa5, 0x20, 0x1b, 0xe5, 0xdf,
 };
 
+static const uint8_t kExampleDSAKeyDER[] = {
+    0x30, 0x82, 0x03, 0x56, 0x02, 0x01, 0x00, 0x02, 0x82, 0x01, 0x01, 0x00,
+    0x9e, 0x12, 0xfa, 0xb3, 0xde, 0x12, 0x21, 0x35, 0x01, 0xdd, 0x82, 0xaa,
+    0x10, 0xca, 0x2d, 0x10, 0x1d, 0x2d, 0x4e, 0xbf, 0xef, 0x4d, 0x2a, 0x3f,
+    0x8d, 0xaa, 0x0f, 0xe0, 0xce, 0xda, 0xd8, 0xd6, 0xaf, 0x85, 0x61, 0x6a,
+    0xa2, 0xf3, 0x25, 0x2c, 0x0a, 0x2b, 0x5a, 0x6d, 0xb0, 0x9e, 0x6f, 0x14,
+    0x90, 0x0e, 0x0d, 0xdb, 0x83, 0x11, 0x87, 0x6d, 0xd8, 0xf9, 0x66, 0x95,
+    0x25, 0xf9, 0x9e, 0xd6, 0x59, 0x49, 0xe1, 0x84, 0xd5, 0x06, 0x47, 0x93,
+    0x27, 0x11, 0x69, 0xa2, 0x28, 0x68, 0x0b, 0x95, 0xec, 0x12, 0xf5, 0x9a,
+    0x8e, 0x20, 0xb2, 0x1f, 0x2b, 0x58, 0xeb, 0x2a, 0x20, 0x12, 0xd3, 0x5b,
+    0xde, 0x2e, 0xe3, 0x51, 0x82, 0x2f, 0xe8, 0xf3, 0x2d, 0x0a, 0x33, 0x05,
+    0x65, 0xdc, 0xce, 0x5c, 0x67, 0x2b, 0x72, 0x59, 0xc1, 0x4b, 0x24, 0x33,
+    0xd0, 0xb5, 0xb2, 0xca, 0x2b, 0x2d, 0xb0, 0xab, 0x62, 0x6e, 0x8f, 0x13,
+    0xf4, 0x7f, 0xe0, 0x34, 0x5d, 0x90, 0x4e, 0x72, 0x94, 0xbb, 0x03, 0x8e,
+    0x9c, 0xe2, 0x1a, 0x9e, 0x58, 0x0b, 0x83, 0x35, 0x62, 0x78, 0x70, 0x6c,
+    0xfe, 0x76, 0x84, 0x36, 0xc6, 0x9d, 0xe1, 0x49, 0xcc, 0xff, 0x98, 0xb4,
+    0xaa, 0xb8, 0xcb, 0x4f, 0x63, 0x85, 0xc9, 0xf1, 0x02, 0xce, 0x59, 0x34,
+    0x6e, 0xae, 0xef, 0x27, 0xe0, 0xad, 0x22, 0x2d, 0x53, 0xd6, 0xe8, 0x9c,
+    0xc8, 0xcd, 0xe5, 0x77, 0x6d, 0xd0, 0x00, 0x57, 0xb0, 0x3f, 0x2d, 0x88,
+    0xab, 0x3c, 0xed, 0xba, 0xfd, 0x7b, 0x58, 0x5f, 0x0b, 0x7f, 0x78, 0x35,
+    0xe1, 0x7a, 0x37, 0x28, 0xbb, 0xf2, 0x5e, 0xa6, 0x25, 0x72, 0xf2, 0x45,
+    0xdc, 0x11, 0x1f, 0x3c, 0xe3, 0x9c, 0xb6, 0xff, 0xac, 0xc3, 0x1b, 0x0a,
+    0x27, 0x90, 0xe7, 0xbd, 0xe9, 0x02, 0x24, 0xea, 0x9b, 0x09, 0x31, 0x53,
+    0x62, 0xaf, 0x3d, 0x2b, 0x02, 0x21, 0x00, 0xf3, 0x81, 0xdc, 0xf5, 0x3e,
+    0xbf, 0x72, 0x4f, 0x8b, 0x2e, 0x5c, 0xa8, 0x2c, 0x01, 0x0f, 0xb4, 0xb5,
+    0xed, 0xa9, 0x35, 0x8d, 0x0f, 0xd8, 0x8e, 0xd2, 0x78, 0x58, 0x94, 0x88,
+    0xb5, 0x4f, 0xc3, 0x02, 0x82, 0x01, 0x00, 0x0c, 0x40, 0x2a, 0x72, 0x5d,
+    0xcc, 0x3a, 0x62, 0xe0, 0x2b, 0xf4, 0xcf, 0x43, 0xcd, 0x17, 0xf4, 0xa4,
+    0x93, 0x59, 0x12, 0x20, 0x22, 0x36, 0x69, 0xcf, 0x41, 0x93, 0xed, 0xab,
+    0x42, 0x3a, 0xd0, 0x8d, 0xfb, 0x55, 0x2e, 0x30, 0x8a, 0x6a, 0x57, 0xa5,
+    0xff, 0xbc, 0x7c, 0xd0, 0xfb, 0x20, 0x87, 0xf8, 0x1f, 0x8d, 0xf0, 0xcb,
+    0x08, 0xab, 0x21, 0x33, 0x28, 0x7d, 0x2b, 0x69, 0x68, 0x71, 0x4a, 0x94,
+    0xf6, 0x33, 0xc9, 0x40, 0x84, 0x5a, 0x48, 0xa3, 0xe1, 0x67, 0x08, 0xdd,
+    0xe7, 0x61, 0xcc, 0x6a, 0x8e, 0xab, 0x2d, 0x84, 0xdb, 0x21, 0xb6, 0xea,
+    0x5b, 0x07, 0x68, 0x14, 0x93, 0xcc, 0x9c, 0x31, 0xfb, 0xc3, 0x68, 0xb2,
+    0x43, 0xf6, 0xdd, 0xf8, 0xc9, 0x32, 0xa8, 0xb4, 0x03, 0x8f, 0x44, 0xe7,
+    0xb1, 0x5c, 0xa8, 0x76, 0x34, 0x4a, 0x14, 0x78, 0x59, 0xf2, 0xb4, 0x3b,
+    0x39, 0x45, 0x86, 0x68, 0xad, 0x5e, 0x0a, 0x1a, 0x9a, 0x66, 0x95, 0x46,
+    0xdd, 0x28, 0x12, 0xe3, 0xb3, 0x61, 0x7a, 0x0a, 0xef, 0x99, 0xd5, 0x8e,
+    0x3b, 0xb4, 0xcc, 0x87, 0xfd, 0x94, 0x22, 0x5e, 0x01, 0xd2, 0xdc, 0xc4,
+    0x69, 0xa7, 0x72, 0x68, 0x14, 0x6c, 0x51, 0x91, 0x8f, 0x18, 0xe8, 0xb4,
+    0xd7, 0x0a, 0xa1, 0xf0, 0xc7, 0x62, 0x3b, 0xcc, 0x52, 0xcf, 0x37, 0x31,
+    0xd3, 0x86, 0x41, 0xb2, 0xd2, 0x83, 0x0b, 0x7e, 0xec, 0xb2, 0xf0, 0x95,
+    0x52, 0xff, 0x13, 0x7d, 0x04, 0x6e, 0x49, 0x4e, 0x7f, 0x33, 0xc3, 0x59,
+    0x00, 0x02, 0xb1, 0x6d, 0x1b, 0x97, 0xd9, 0x36, 0xfd, 0xa2, 0x8f, 0x90,
+    0xc3, 0xed, 0x3c, 0xa3, 0x53, 0x38, 0x16, 0x8a, 0xc1, 0x6f, 0x77, 0xc3,
+    0xc5, 0x7a, 0xdc, 0x2e, 0x8f, 0x7c, 0x6c, 0x22, 0x56, 0xe4, 0x1a, 0x5f,
+    0x65, 0x45, 0x05, 0x90, 0xdb, 0xb5, 0xbc, 0xf0, 0x6d, 0x66, 0x61, 0x02,
+    0x82, 0x01, 0x00, 0x31, 0x97, 0x31, 0xa1, 0x4e, 0x38, 0x56, 0x88, 0xdb,
+    0x94, 0x1d, 0xbf, 0x65, 0x5c, 0xda, 0x4b, 0xc2, 0x10, 0xde, 0x74, 0x20,
+    0x03, 0xce, 0x13, 0x60, 0xf2, 0x25, 0x1d, 0x55, 0x7c, 0x5d, 0x94, 0x82,
+    0x54, 0x08, 0x53, 0xdb, 0x85, 0x95, 0xbf, 0xdd, 0x5e, 0x50, 0xd5, 0x96,
+    0xe0, 0x79, 0x51, 0x1b, 0xbf, 0x4d, 0x4e, 0xb9, 0x3a, 0xc5, 0xee, 0xc4,
+    0x5e, 0x98, 0x75, 0x7b, 0xbe, 0xff, 0x30, 0xe6, 0xd0, 0x7b, 0xa6, 0xf1,
+    0xbc, 0x29, 0xea, 0xdf, 0xec, 0xf3, 0x8b, 0xfa, 0x83, 0x11, 0x9f, 0x3f,
+    0xf0, 0x5d, 0x06, 0x51, 0x32, 0xaa, 0x21, 0xfc, 0x26, 0x17, 0xe7, 0x50,
+    0xc2, 0x16, 0xba, 0xfa, 0x54, 0xb7, 0x7e, 0x1d, 0x2c, 0xa6, 0xa3, 0x41,
+    0x66, 0x33, 0x94, 0x83, 0xb9, 0xbf, 0xa0, 0x4f, 0xbd, 0xa6, 0xfd, 0x2c,
+    0x81, 0x58, 0x35, 0x33, 0x39, 0xc0, 0x6d, 0x33, 0x40, 0x56, 0x64, 0x12,
+    0x5a, 0xcd, 0x35, 0x53, 0x21, 0x78, 0x8f, 0x27, 0x24, 0x37, 0x66, 0x8a,
+    0xdf, 0x5e, 0x5f, 0x63, 0xfc, 0x8b, 0x2d, 0xef, 0x57, 0xdb, 0x40, 0x25,
+    0xd5, 0x17, 0x53, 0x0b, 0xe4, 0xa5, 0xae, 0x54, 0xbf, 0x46, 0x4f, 0xa6,
+    0x79, 0xc3, 0x74, 0xfa, 0x1f, 0x85, 0x34, 0x64, 0x6d, 0xc5, 0x03, 0xeb,
+    0x72, 0x98, 0x80, 0x7b, 0xc0, 0x8f, 0x35, 0x11, 0xa7, 0x09, 0xeb, 0x51,
+    0xe0, 0xb0, 0xac, 0x92, 0x14, 0xf2, 0xad, 0x37, 0x95, 0x5a, 0xba, 0x8c,
+    0xc4, 0xdb, 0xed, 0xc4, 0x4e, 0x8b, 0x8f, 0x84, 0x33, 0x64, 0xf8, 0x57,
+    0x12, 0xd7, 0x08, 0x7e, 0x90, 0x66, 0xdf, 0x91, 0x50, 0x23, 0xf2, 0x73,
+    0xc0, 0x6b, 0xb1, 0x15, 0xdd, 0x64, 0xd7, 0xc9, 0x75, 0x17, 0x73, 0x72,
+    0xda, 0x33, 0xc4, 0x6f, 0xa5, 0x47, 0xa1, 0xcc, 0xd1, 0xc6, 0x62, 0xe5,
+    0xca, 0xab, 0x5f, 0x2a, 0x8f, 0x6b, 0xcc, 0x02, 0x21, 0x00, 0xb0, 0xc7,
+    0x68, 0x70, 0x27, 0x43, 0xbc, 0x51, 0x24, 0x29, 0x93, 0xa9, 0x71, 0xa5,
+    0x28, 0x89, 0x79, 0x54, 0x44, 0xf7, 0xc6, 0x45, 0x22, 0x03, 0xd0, 0xce,
+    0x84, 0xfe, 0x61, 0x17, 0xd4, 0x6e,
+};
+
 static const uint8_t kMsg[] = {1, 2, 3, 4};
 
 static const uint8_t kSignature[] = {
@@ -509,6 +584,13 @@
     return 1;
   }
 
+  if (!Testd2i_AutoPrivateKey(kExampleDSAKeyDER, sizeof(kExampleDSAKeyDER),
+                              EVP_PKEY_DSA)) {
+    fprintf(stderr, "d2i_AutoPrivateKey(kExampleDSAKeyDER) failed\n");
+    BIO_print_errors_fp(stderr);
+    return 1;
+  }
+
   if (!TestEVP_PKCS82PKEY()) {
     fprintf(stderr, "TestEVP_PKCS82PKEY failed\n");
     BIO_print_errors_fp(stderr);
diff --git a/crypto/evp/p_dsa_asn1.c b/crypto/evp/p_dsa_asn1.c
new file mode 100644
index 0000000..fce644b
--- /dev/null
+++ b/crypto/evp/p_dsa_asn1.c
@@ -0,0 +1,594 @@
+/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
+ * 2006.
+ */
+/* ====================================================================
+ * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
+ *
+ * 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 above 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 acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED 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 OpenSSL PROJECT OR
+ * ITS 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.
+ * ====================================================================
+ *
+ * This product includes cryptographic software written by Eric Young
+ * (eay@cryptsoft.com).  This product includes software written by Tim
+ * Hudson (tjh@cryptsoft.com). */
+
+#include <openssl/evp.h>
+
+#include <openssl/asn1.h>
+#include <openssl/asn1t.h>
+#include <openssl/digest.h>
+#include <openssl/dsa.h>
+#include <openssl/err.h>
+#include <openssl/mem.h>
+#include <openssl/obj.h>
+#include <openssl/x509.h>
+
+#include "../dsa/internal.h"
+#include "internal.h"
+
+
+static int dsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey) {
+  const uint8_t *p, *pm;
+  int pklen, pmlen;
+  int ptype;
+  void *pval;
+  ASN1_STRING *pstr;
+  X509_ALGOR *palg;
+  ASN1_INTEGER *public_key = NULL;
+
+  DSA *dsa = NULL;
+
+  if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey)) {
+    return 0;
+  }
+  X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+  if (ptype == V_ASN1_SEQUENCE) {
+    pstr = pval;
+    pm = pstr->data;
+    pmlen = pstr->length;
+
+    dsa = d2i_DSAparams(NULL, &pm, pmlen);
+    if (dsa == NULL) {
+      OPENSSL_PUT_ERROR(EVP, dsa_pub_decode, EVP_R_DECODE_ERROR);
+      goto err;
+    }
+  } else if (ptype == V_ASN1_NULL || ptype == V_ASN1_UNDEF) {
+    dsa = DSA_new();
+    if (dsa == NULL) {
+      OPENSSL_PUT_ERROR(EVP, dsa_pub_decode, ERR_R_MALLOC_FAILURE);
+      goto err;
+    }
+  } else {
+    OPENSSL_PUT_ERROR(EVP, dsa_pub_decode, EVP_R_PARAMETER_ENCODING_ERROR);
+    goto err;
+  }
+
+  public_key = d2i_ASN1_INTEGER(NULL, &p, pklen);
+  if (public_key == NULL) {
+    OPENSSL_PUT_ERROR(EVP, dsa_pub_decode, EVP_R_DECODE_ERROR);
+    goto err;
+  }
+
+  dsa->pub_key = ASN1_INTEGER_to_BN(public_key, NULL);
+  if (dsa->pub_key == NULL) {
+    OPENSSL_PUT_ERROR(EVP, dsa_pub_decode, EVP_R_BN_DECODE_ERROR);
+    goto err;
+  }
+
+  ASN1_INTEGER_free(public_key);
+  EVP_PKEY_assign_DSA(pkey, dsa);
+  return 1;
+
+err:
+  if (public_key) {
+    ASN1_INTEGER_free(public_key);
+  }
+  if (dsa) {
+    DSA_free(dsa);
+  }
+  return 0;
+}
+
+static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey) {
+  DSA *dsa;
+  void *pval = NULL;
+  uint8_t *penc = NULL;
+  int penclen;
+
+  dsa = pkey->pkey.dsa;
+  dsa->write_params = 0;
+
+  penclen = i2d_DSAPublicKey(dsa, &penc);
+
+  if (penclen <= 0) {
+    OPENSSL_PUT_ERROR(EVP, dsa_pub_encode, ERR_R_MALLOC_FAILURE);
+    goto err;
+  }
+
+  if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA), V_ASN1_UNDEF, pval,
+                             penc, penclen)) {
+    return 1;
+  }
+
+err:
+  if (penc) {
+    OPENSSL_free(penc);
+  }
+  if (pval) {
+    ASN1_STRING_free(pval);
+  }
+
+  return 0;
+}
+
+static int dsa_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8) {
+  const uint8_t *p, *pm;
+  int pklen, pmlen;
+  int ptype;
+  void *pval;
+  ASN1_STRING *pstr;
+  X509_ALGOR *palg;
+  ASN1_INTEGER *privkey = NULL;
+  BN_CTX *ctx = NULL;
+
+  /* In PKCS#8 DSA: you just get a private key integer and parameters in the
+   * AlgorithmIdentifier the pubkey must be recalculated. */
+
+  STACK_OF(ASN1_TYPE) *ndsa = NULL;
+  DSA *dsa = NULL;
+
+  if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8)) {
+    return 0;
+  }
+  X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+  /* Check for broken DSA PKCS#8, UGH! */
+  if (*p == (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) {
+    ASN1_TYPE *t1, *t2;
+    ndsa = d2i_ASN1_SEQUENCE_ANY(NULL, &p, pklen);
+    if (ndsa == NULL) {
+      goto decerr;
+    }
+    if (sk_ASN1_TYPE_num(ndsa) != 2) {
+      goto decerr;
+    }
+
+    /* Handle Two broken types:
+     * SEQUENCE {parameters, priv_key}
+     * SEQUENCE {pub_key, priv_key}. */
+
+    t1 = sk_ASN1_TYPE_value(ndsa, 0);
+    t2 = sk_ASN1_TYPE_value(ndsa, 1);
+    if (t1->type == V_ASN1_SEQUENCE) {
+      p8->broken = PKCS8_EMBEDDED_PARAM;
+      pval = t1->value.ptr;
+    } else if (ptype == V_ASN1_SEQUENCE) {
+      p8->broken = PKCS8_NS_DB;
+    } else {
+      goto decerr;
+    }
+
+    if (t2->type != V_ASN1_INTEGER) {
+      goto decerr;
+    }
+
+    privkey = t2->value.integer;
+  } else {
+    const uint8_t *q = p;
+    privkey = d2i_ASN1_INTEGER(NULL, &p, pklen);
+    if (privkey == NULL) {
+      goto decerr;
+    }
+    if (privkey->type == V_ASN1_NEG_INTEGER) {
+      p8->broken = PKCS8_NEG_PRIVKEY;
+      ASN1_INTEGER_free(privkey);
+      privkey = d2i_ASN1_UINTEGER(NULL, &q, pklen);
+      if (privkey == NULL) {
+        goto decerr;
+      }
+    }
+    if (ptype != V_ASN1_SEQUENCE) {
+      goto decerr;
+    }
+  }
+
+  pstr = pval;
+  pm = pstr->data;
+  pmlen = pstr->length;
+  dsa = d2i_DSAparams(NULL, &pm, pmlen);
+  if (dsa == NULL) {
+    goto decerr;
+  }
+  /* We have parameters. Now set private key */
+  dsa->priv_key = ASN1_INTEGER_to_BN(privkey, NULL);
+  if (dsa->priv_key == NULL) {
+    OPENSSL_PUT_ERROR(EVP, dsa_priv_decode, ERR_LIB_BN);
+    goto dsaerr;
+  }
+  /* Calculate public key. */
+  dsa->pub_key = BN_new();
+  if (dsa->pub_key == NULL) {
+    OPENSSL_PUT_ERROR(EVP, dsa_priv_decode, ERR_R_MALLOC_FAILURE);
+    goto dsaerr;
+  }
+  ctx = BN_CTX_new();
+  if (ctx == NULL) {
+    OPENSSL_PUT_ERROR(EVP, dsa_priv_decode, ERR_R_MALLOC_FAILURE);
+    goto dsaerr;
+  }
+
+  if (!BN_mod_exp(dsa->pub_key, dsa->g, dsa->priv_key, dsa->p, ctx)) {
+    OPENSSL_PUT_ERROR(EVP, dsa_priv_decode, ERR_LIB_BN);
+    goto dsaerr;
+  }
+
+  EVP_PKEY_assign_DSA(pkey, dsa);
+  BN_CTX_free(ctx);
+  if (ndsa) {
+    sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
+  } else {
+    ASN1_INTEGER_free(privkey);
+  }
+
+  return 1;
+
+decerr:
+  OPENSSL_PUT_ERROR(EVP, dsa_priv_decode, EVP_R_DECODE_ERROR);
+
+dsaerr:
+  BN_CTX_free(ctx);
+  if (privkey) {
+    ASN1_INTEGER_free(privkey);
+  }
+  sk_ASN1_TYPE_pop_free(ndsa, ASN1_TYPE_free);
+  DSA_free(dsa);
+  return 0;
+}
+
+static int dsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) {
+  ASN1_STRING *params = NULL;
+  ASN1_INTEGER *prkey = NULL;
+  uint8_t *dp = NULL;
+  int dplen;
+
+  if (!pkey->pkey.dsa || !pkey->pkey.dsa->priv_key) {
+    OPENSSL_PUT_ERROR(EVP, dsa_priv_encode, EVP_R_MISSING_PARAMETERS);
+    goto err;
+  }
+
+  params = ASN1_STRING_new();
+  if (!params) {
+    OPENSSL_PUT_ERROR(EVP, dsa_priv_encode, ERR_R_MALLOC_FAILURE);
+    goto err;
+  }
+
+  params->length = i2d_DSAparams(pkey->pkey.dsa, &params->data);
+  if (params->length <= 0) {
+    OPENSSL_PUT_ERROR(EVP, dsa_priv_encode, ERR_R_MALLOC_FAILURE);
+    goto err;
+  }
+  params->type = V_ASN1_SEQUENCE;
+
+  /* Get private key into integer. */
+  prkey = BN_to_ASN1_INTEGER(pkey->pkey.dsa->priv_key, NULL);
+
+  if (!prkey) {
+    OPENSSL_PUT_ERROR(EVP, dsa_priv_encode, ERR_LIB_BN);
+    goto err;
+  }
+
+  dplen = i2d_ASN1_INTEGER(prkey, &dp);
+
+  ASN1_INTEGER_free(prkey);
+
+  if (!PKCS8_pkey_set0(p8, (ASN1_OBJECT *)OBJ_nid2obj(NID_dsa), 0,
+                       V_ASN1_SEQUENCE, params, dp, dplen)) {
+    goto err;
+  }
+
+  return 1;
+
+err:
+  if (dp != NULL) {
+    OPENSSL_free(dp);
+  }
+  if (params != NULL) {
+    ASN1_STRING_free(params);
+  }
+  if (prkey != NULL) {
+    ASN1_INTEGER_free(prkey);
+  }
+  return 0;
+}
+
+static int int_dsa_size(const EVP_PKEY *pkey) {
+  return DSA_size(pkey->pkey.dsa);
+}
+
+static int dsa_bits(const EVP_PKEY *pkey) {
+  return BN_num_bits(pkey->pkey.dsa->p);
+}
+
+static int dsa_missing_parameters(const EVP_PKEY *pkey) {
+  DSA *dsa;
+  dsa = pkey->pkey.dsa;
+  if (dsa->p == NULL || dsa->q == NULL || dsa->g == NULL) {
+    return 1;
+  }
+  return 0;
+}
+
+static int dup_bn_into(BIGNUM **out, BIGNUM *src) {
+  BIGNUM *a;
+
+  a = BN_dup(src);
+  if (a == NULL) {
+    return 0;
+  }
+  if (*out != NULL) {
+    BN_free(*out);
+  }
+  *out = a;
+
+  return 1;
+}
+
+static int dsa_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) {
+  if (!dup_bn_into(&to->pkey.dsa->p, from->pkey.dsa->p) ||
+      !dup_bn_into(&to->pkey.dsa->q, from->pkey.dsa->q) ||
+      !dup_bn_into(&to->pkey.dsa->g, from->pkey.dsa->g)) {
+    return 0;
+  }
+
+  return 1;
+}
+
+static int dsa_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) {
+  return BN_cmp(a->pkey.dsa->p, b->pkey.dsa->p) == 0 &&
+         BN_cmp(a->pkey.dsa->q, b->pkey.dsa->q) == 0 &&
+         BN_cmp(a->pkey.dsa->g, b->pkey.dsa->g) == 0;
+}
+
+static int dsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b) {
+  return BN_cmp(b->pkey.dsa->pub_key, a->pkey.dsa->pub_key) == 0;
+}
+
+static void int_dsa_free(EVP_PKEY *pkey) { DSA_free(pkey->pkey.dsa); }
+
+static void update_buflen(const BIGNUM *b, size_t *pbuflen) {
+  size_t i;
+
+  if (!b) {
+    return;
+  }
+  i = BN_num_bytes(b);
+  if (*pbuflen < i) {
+    *pbuflen = i;
+  }
+}
+
+static int do_dsa_print(BIO *bp, const DSA *x, int off, int ptype) {
+  uint8_t *m = NULL;
+  int ret = 0;
+  size_t buf_len = 0;
+  const char *ktype = NULL;
+
+  const BIGNUM *priv_key, *pub_key;
+
+  priv_key = NULL;
+  if (ptype == 2) {
+    priv_key = x->priv_key;
+  }
+
+  pub_key = NULL;
+  if (ptype > 0) {
+    pub_key = x->pub_key;
+  }
+
+  ktype = "DSA-Parameters";
+  if (ptype == 2) {
+    ktype = "Private-Key";
+  } else if (ptype == 1) {
+    ktype = "Public-Key";
+  }
+
+  update_buflen(x->p, &buf_len);
+  update_buflen(x->q, &buf_len);
+  update_buflen(x->g, &buf_len);
+  update_buflen(priv_key, &buf_len);
+  update_buflen(pub_key, &buf_len);
+
+  m = (uint8_t *)OPENSSL_malloc(buf_len + 10);
+  if (m == NULL) {
+    OPENSSL_PUT_ERROR(EVP, do_dsa_print, ERR_R_MALLOC_FAILURE);
+    goto err;
+  }
+
+  if (priv_key) {
+    if (!BIO_indent(bp, off, 128) ||
+        BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0) {
+      goto err;
+    }
+  }
+
+  if (!ASN1_bn_print(bp, "priv:", priv_key, m, off) ||
+      !ASN1_bn_print(bp, "pub: ", pub_key, m, off) ||
+      !ASN1_bn_print(bp, "P:   ", x->p, m, off) ||
+      !ASN1_bn_print(bp, "Q:   ", x->q, m, off) ||
+      !ASN1_bn_print(bp, "G:   ", x->g, m, off)) {
+    goto err;
+  }
+  ret = 1;
+
+err:
+  if (m != NULL) {
+    OPENSSL_free(m);
+  }
+  return (ret);
+}
+
+static int dsa_param_decode(EVP_PKEY *pkey, const uint8_t **pder, int derlen) {
+  DSA *dsa;
+  dsa = d2i_DSAparams(NULL, pder, derlen);
+  if (dsa == NULL) {
+    OPENSSL_PUT_ERROR(EVP, dsa_param_decode, ERR_R_DSA_LIB);
+    return 0;
+  }
+  EVP_PKEY_assign_DSA(pkey, dsa);
+  return 1;
+}
+
+static int dsa_param_encode(const EVP_PKEY *pkey, uint8_t **pder) {
+  return i2d_DSAparams(pkey->pkey.dsa, pder);
+}
+
+static int dsa_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
+                           ASN1_PCTX *ctx) {
+  return do_dsa_print(bp, pkey->pkey.dsa, indent, 0);
+}
+
+static int dsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
+                         ASN1_PCTX *ctx) {
+  return do_dsa_print(bp, pkey->pkey.dsa, indent, 1);
+}
+
+static int dsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
+                          ASN1_PCTX *ctx) {
+  return do_dsa_print(bp, pkey->pkey.dsa, indent, 2);
+}
+
+static int old_dsa_priv_decode(EVP_PKEY *pkey, const uint8_t **pder,
+                               int derlen) {
+  DSA *dsa;
+  dsa = d2i_DSAPrivateKey(NULL, pder, derlen);
+  if (dsa == NULL) {
+    OPENSSL_PUT_ERROR(EVP, old_dsa_priv_decode, ERR_R_DSA_LIB);
+    return 0;
+  }
+  EVP_PKEY_assign_DSA(pkey, dsa);
+  return 1;
+}
+
+static int old_dsa_priv_encode(const EVP_PKEY *pkey, uint8_t **pder) {
+  return i2d_DSAPrivateKey(pkey->pkey.dsa, pder);
+}
+
+static int dsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
+                         const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx) {
+  DSA_SIG *dsa_sig;
+  const uint8_t *p;
+
+  if (!sig) {
+    return BIO_puts(bp, "\n") > 0;
+  }
+
+  p = sig->data;
+  dsa_sig = d2i_DSA_SIG(NULL, &p, sig->length);
+  if (dsa_sig == NULL) {
+    return X509_signature_dump(bp, sig, indent);
+  }
+
+  int rv = 0;
+  size_t buf_len = 0;
+  uint8_t *m = NULL;
+
+  update_buflen(dsa_sig->r, &buf_len);
+  update_buflen(dsa_sig->s, &buf_len);
+  m = OPENSSL_malloc(buf_len + 10);
+  if (m == NULL) {
+    OPENSSL_PUT_ERROR(EVP, dsa_sig_print, ERR_R_MALLOC_FAILURE);
+    goto err;
+  }
+
+  if (BIO_write(bp, "\n", 1) != 1 ||
+      !ASN1_bn_print(bp, "r:   ", dsa_sig->r, m, indent) ||
+      !ASN1_bn_print(bp, "s:   ", dsa_sig->s, m, indent)) {
+    goto err;
+  }
+  rv = 1;
+
+err:
+  if (m) {
+    OPENSSL_free(m);
+  }
+  DSA_SIG_free(dsa_sig);
+  return rv;
+}
+
+const EVP_PKEY_ASN1_METHOD dsa_asn1_meth = {
+  EVP_PKEY_DSA,
+  EVP_PKEY_DSA,
+  0,
+
+  "DSA",
+  "OpenSSL DSA method",
+
+  dsa_pub_decode,
+  dsa_pub_encode,
+  dsa_pub_cmp,
+  dsa_pub_print,
+
+  dsa_priv_decode,
+  dsa_priv_encode,
+  dsa_priv_print,
+
+  NULL /* pkey_opaque */,
+  NULL /* pkey_supports_digest */,
+
+  int_dsa_size,
+  dsa_bits,
+
+  dsa_param_decode,
+  dsa_param_encode,
+  dsa_missing_parameters,
+  dsa_copy_parameters,
+  dsa_cmp_parameters,
+  dsa_param_print,
+  dsa_sig_print,
+
+  int_dsa_free,
+  old_dsa_priv_decode,
+  old_dsa_priv_encode,
+};