Remove duplicate code.

Update code to use ASN1_TYPE_pack_sequence and ASN1_TYPE_unpack_sequence
instead of performing the same operation manually.

Reviewed-by: Rich Salz <rsalz@openssl.org>

crypto/asn1/p5_pbev2.c

@@ -165,17 +165,14 @@ X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
 
     if (!(ret = X509_ALGOR_new()))
         goto merr;
-    if (!(ret->parameter = ASN1_TYPE_new()))
-        goto merr;
 
     ret->algorithm = OBJ_nid2obj(NID_pbes2);
 
     /* Encode PBE2PARAM into parameter */
 
-    if (!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM),
-                        &ret->parameter->value.sequence))
+    if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBE2PARAM), pbe2,
+                                 &ret->parameter))
          goto merr;
-    ret->parameter->type = V_ASN1_SEQUENCE;
 
     PBE2PARAM_free(pbe2);
     pbe2 = NULL;
@@ -261,13 +258,9 @@ X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
 
     /* Encode PBKDF2PARAM into parameter of pbe2 */
 
-    if (!(keyfunc->parameter = ASN1_TYPE_new()))
-        goto merr;
-
-    if (!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM),
-                        &keyfunc->parameter->value.sequence))
+    if (!ASN1_TYPE_pack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), kdf,
+                                 &keyfunc->parameter))
          goto merr;
-    keyfunc->parameter->type = V_ASN1_SEQUENCE;
 
     PBKDF2PARAM_free(kdf);
     return keyfunc;

crypto/cms/cms_pwri.c

@@ -320,8 +320,6 @@ int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
 {
     CMS_EncryptedContentInfo *ec;
     CMS_PasswordRecipientInfo *pwri;
-    const unsigned char *p = NULL;
-    int plen;
     int r = 0;
     X509_ALGOR *algtmp, *kekalg = NULL;
     EVP_CIPHER_CTX kekctx;
@@ -346,11 +344,9 @@ int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,
         return 0;
     }
 
-    if (algtmp->parameter->type == V_ASN1_SEQUENCE) {
-        p = algtmp->parameter->value.sequence->data;
-        plen = algtmp->parameter->value.sequence->length;
-        kekalg = d2i_X509_ALGOR(NULL, &p, plen);
-    }
+    kekalg = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
+                                       algtmp->parameter);
+
     if (kekalg == NULL) {
         CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,
                CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);

crypto/evp/p5_crpt.c

@@ -82,7 +82,6 @@ int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
     PBEPARAM *pbe;
     int saltlen, iter;
     unsigned char *salt;
-    const unsigned char *pbuf;
     int mdsize;
     int rv = 0;
     EVP_MD_CTX_init(&ctx);
@@ -94,8 +93,8 @@ int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
         return 0;
     }
 
-    pbuf = param->value.sequence->data;
-    if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) {
+    pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), param);
+    if (pbe == NULL) {
         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
         return 0;
     }

crypto/evp/p5_crpt2.c

@@ -190,23 +190,14 @@ int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
                           ASN1_TYPE *param, const EVP_CIPHER *c,
                           const EVP_MD *md, int en_de)
 {
-    const unsigned char *pbuf;
-    int plen;
     PBE2PARAM *pbe2 = NULL;
     const EVP_CIPHER *cipher;
     EVP_PBE_KEYGEN *kdf;
 
     int rv = 0;
 
-    if (param == NULL || param->type != V_ASN1_SEQUENCE ||
-        param->value.sequence == NULL) {
-        EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
-        goto err;
-    }
-
-    pbuf = param->value.sequence->data;
-    plen = param->value.sequence->length;
-    if (!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
+    pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
+    if (pbe2 == NULL) {
         EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
         goto err;
     }
@@ -248,8 +239,7 @@ int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
                              const EVP_CIPHER *c, const EVP_MD *md, int en_de)
 {
     unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
-    const unsigned char *pbuf;
-    int saltlen, iter, plen;
+    int saltlen, iter;
     int rv = 0;
     unsigned int keylen = 0;
     int prf_nid, hmac_md_nid;
@@ -265,15 +255,9 @@ int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
 
     /* Decode parameter */
 
-    if (!param || (param->type != V_ASN1_SEQUENCE)) {
-        EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
-        goto err;
-    }
-
-    pbuf = param->value.sequence->data;
-    plen = param->value.sequence->length;
+    kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
 
-    if (!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen))) {
+    if (kdf == NULL) {
         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
         goto err;
     }

crypto/pkcs12/p12_crpt.c

@@ -74,18 +74,12 @@ int PKCS12_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
     PBEPARAM *pbe;
     int saltlen, iter, ret;
     unsigned char *salt;
-    const unsigned char *pbuf;
     unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
 
     /* Extract useful info from parameter */
-    if (param == NULL || param->type != V_ASN1_SEQUENCE ||
-        param->value.sequence == NULL) {
-        PKCS12err(PKCS12_F_PKCS12_PBE_KEYIVGEN, PKCS12_R_DECODE_ERROR);
-        return 0;
-    }
 
-    pbuf = param->value.sequence->data;
-    if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) {
+    pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), param);
+    if (pbe == NULL) {
         PKCS12err(PKCS12_F_PKCS12_PBE_KEYIVGEN, PKCS12_R_DECODE_ERROR);
         return 0;
     }

crypto/pkcs12/p12_npas.c

@@ -221,10 +221,7 @@ static int newpass_bag(PKCS12_SAFEBAG *bag, char *oldpass, char *newpass)
 static int alg_get(X509_ALGOR *alg, int *pnid, int *piter, int *psaltlen)
 {
     PBEPARAM *pbe;
-    const unsigned char *p;
-
-    p = alg->parameter->value.sequence->data;
-    pbe = d2i_PBEPARAM(NULL, &p, alg->parameter->value.sequence->length);
+    pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), alg->parameter);
     if (!pbe)
         return 0;
     *pnid = OBJ_obj2nid(alg->algorithm);

crypto/rsa/rsa_ameth.c

@@ -271,34 +271,23 @@ static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
 /* Given an MGF1 Algorithm ID decode to an Algorithm Identifier */
 static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
 {
-    const unsigned char *p;
-    int plen;
     if (alg == NULL)
         return NULL;
     if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
         return NULL;
-    if (alg->parameter->type != V_ASN1_SEQUENCE)
-        return NULL;
-
-    p = alg->parameter->value.sequence->data;
-    plen = alg->parameter->value.sequence->length;
-    return d2i_X509_ALGOR(NULL, &p, plen);
+    return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
+                                     alg->parameter);
 }
 
 static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg,
                                       X509_ALGOR **pmaskHash)
 {
-    const unsigned char *p;
-    int plen;
     RSA_PSS_PARAMS *pss;
 
     *pmaskHash = NULL;
 
-    if (!alg->parameter || alg->parameter->type != V_ASN1_SEQUENCE)
-        return NULL;
-    p = alg->parameter->value.sequence->data;
-    plen = alg->parameter->value.sequence->length;
-    pss = d2i_RSA_PSS_PARAMS(NULL, &p, plen);
+    pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
+                                    alg->parameter);
 
     if (!pss)
         return NULL;
@@ -768,17 +757,12 @@ static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
 static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg,
                                         X509_ALGOR **pmaskHash)
 {
-    const unsigned char *p;
-    int plen;
     RSA_OAEP_PARAMS *pss;
 
     *pmaskHash = NULL;
 
-    if (!alg->parameter || alg->parameter->type != V_ASN1_SEQUENCE)
-        return NULL;
-    p = alg->parameter->value.sequence->data;
-    plen = alg->parameter->value.sequence->length;
-    pss = d2i_RSA_OAEP_PARAMS(NULL, &p, plen);
+    pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
+                                    alg->parameter);
 
     if (!pss)
         return NULL;