diff options
author | Dr. Stephen Henson <steve@openssl.org> | 2009-11-25 22:01:06 +0000 |
---|---|---|
committer | Dr. Stephen Henson <steve@openssl.org> | 2009-11-25 22:01:06 +0000 |
commit | 3d63b3966fc2d6913ba859e9a24c4d3a23387234 (patch) | |
tree | 43b83da206b9a4bcc057e5aa9349d00aa573792d /crypto/asn1/p5_pbev2.c | |
parent | 451038b40c47d5ed76ac6622dd2bd7c3c7372a57 (diff) |
Split PBES2 into cipher and PBKDF2 versions. This tidies the code somewhat
and is a pre-requisite to adding password based CMS support.
Diffstat (limited to 'crypto/asn1/p5_pbev2.c')
-rw-r--r-- | crypto/asn1/p5_pbev2.c | 140 |
1 files changed, 91 insertions, 49 deletions
diff --git a/crypto/asn1/p5_pbev2.c b/crypto/asn1/p5_pbev2.c index 377edaffc9..b053a6efc0 100644 --- a/crypto/asn1/p5_pbev2.c +++ b/crypto/asn1/p5_pbev2.c @@ -91,12 +91,10 @@ X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter, unsigned char *aiv, int prf_nid) { X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL; - int alg_nid; + int alg_nid, keylen; EVP_CIPHER_CTX ctx; unsigned char iv[EVP_MAX_IV_LENGTH]; - PBKDF2PARAM *kdf = NULL; PBE2PARAM *pbe2 = NULL; - ASN1_OCTET_STRING *osalt = NULL; ASN1_OBJECT *obj; alg_nid = EVP_CIPHER_type(cipher); @@ -146,55 +144,19 @@ X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter, } EVP_CIPHER_CTX_cleanup(&ctx); - if(!(kdf = PBKDF2PARAM_new())) goto merr; - if(!(osalt = M_ASN1_OCTET_STRING_new())) goto merr; - - if (!saltlen) saltlen = PKCS5_SALT_LEN; - if (!(osalt->data = OPENSSL_malloc (saltlen))) goto merr; - osalt->length = saltlen; - if (salt) memcpy (osalt->data, salt, saltlen); - else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) goto merr; - - if(iter <= 0) iter = PKCS5_DEFAULT_ITER; - if(!ASN1_INTEGER_set(kdf->iter, iter)) goto merr; - - /* Now include salt in kdf structure */ - kdf->salt->value.octet_string = osalt; - kdf->salt->type = V_ASN1_OCTET_STRING; - osalt = NULL; - /* If its RC2 then we'd better setup the key length */ - if(alg_nid == NID_rc2_cbc) { - if(!(kdf->keylength = M_ASN1_INTEGER_new())) goto merr; - if(!ASN1_INTEGER_set (kdf->keylength, - EVP_CIPHER_key_length(cipher))) goto merr; - } - - /* prf can stay NULL if we are using hmacWithSHA1 */ - if (prf_nid != NID_hmacWithSHA1) - { - kdf->prf = X509_ALGOR_new(); - if (!kdf->prf) - goto merr; - X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), - V_ASN1_NULL, NULL); - } - - /* Now setup the PBE2PARAM keyfunc structure */ + if(alg_nid == NID_rc2_cbc) + keylen = EVP_CIPHER_key_length(cipher); + else + keylen = -1; - pbe2->keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2); + /* Setup keyfunc */ - /* Encode PBKDF2PARAM into parameter of pbe2 */ + pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen); - if(!(pbe2->keyfunc->parameter = ASN1_TYPE_new())) goto merr; - - if(!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM), - &pbe2->keyfunc->parameter->value.sequence)) goto merr; - pbe2->keyfunc->parameter->type = V_ASN1_SEQUENCE; - - PBKDF2PARAM_free(kdf); - kdf = NULL; + if (!pbe2->keyfunc) + goto merr; /* Now set up top level AlgorithmIdentifier */ @@ -220,8 +182,6 @@ X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter, err: PBE2PARAM_free(pbe2); /* Note 'scheme' is freed as part of pbe2 */ - M_ASN1_OCTET_STRING_free(osalt); - PBKDF2PARAM_free(kdf); X509_ALGOR_free(kalg); X509_ALGOR_free(ret); @@ -234,3 +194,85 @@ X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter, { return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1); } + +X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen, + int prf_nid, int keylen) + { + X509_ALGOR *keyfunc = NULL; + PBKDF2PARAM *kdf = NULL; + ASN1_OCTET_STRING *osalt = NULL; + + if(!(kdf = PBKDF2PARAM_new())) + goto merr; + if(!(osalt = M_ASN1_OCTET_STRING_new())) + goto merr; + + kdf->salt->value.octet_string = osalt; + kdf->salt->type = V_ASN1_OCTET_STRING; + + if (!saltlen) + saltlen = PKCS5_SALT_LEN; + if (!(osalt->data = OPENSSL_malloc (saltlen))) + goto merr; + + osalt->length = saltlen; + + if (salt) + memcpy (osalt->data, salt, saltlen); + else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) + goto merr; + + if(iter <= 0) + iter = PKCS5_DEFAULT_ITER; + + if(!ASN1_INTEGER_set(kdf->iter, iter)) + goto merr; + + /* If have a key len set it up */ + + if(keylen > 0) + { + if(!(kdf->keylength = M_ASN1_INTEGER_new())) + goto merr; + if(!ASN1_INTEGER_set (kdf->keylength, keylen)) + goto merr; + } + + /* prf can stay NULL if we are using hmacWithSHA1 */ + if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) + { + kdf->prf = X509_ALGOR_new(); + if (!kdf->prf) + goto merr; + X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), + V_ASN1_NULL, NULL); + } + + /* Finally setup the keyfunc structure */ + + keyfunc = X509_ALGOR_new(); + if (!keyfunc) + goto merr; + + keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2); + + /* 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)) + goto merr; + keyfunc->parameter->type = V_ASN1_SEQUENCE; + + PBKDF2PARAM_free(kdf); + return keyfunc; + + merr: + ASN1err(ASN1_F_PKCS5_PBKDF2_SET,ERR_R_MALLOC_FAILURE); + PBKDF2PARAM_free(kdf); + X509_ALGOR_free(keyfunc); + return NULL; + } + |