/** * \file oid.c * * \brief Object Identifier (OID) database * * Copyright (C) 2006-2014, ARM Limited, All Rights Reserved * * This file is part of mbed TLS (https://tls.mbed.org) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #if !defined(POLARSSL_CONFIG_FILE) #include "polarssl/config.h" #else #include POLARSSL_CONFIG_FILE #endif #if defined(POLARSSL_OID_C) #include "polarssl/oid.h" #include "polarssl/rsa.h" #include #include #if defined(POLARSSL_PLATFORM_C) #include "polarssl/platform.h" #else #define polarssl_snprintf snprintf #endif #if defined(POLARSSL_X509_USE_C) || defined(POLARSSL_X509_CREATE_C) #include "polarssl/x509.h" #endif /* * Macro to automatically add the size of #define'd OIDs */ #define ADD_LEN(s) s, OID_SIZE(s) /* * Macro to generate an internal function for oid_XXX_from_asn1() (used by * the other functions) */ #define FN_OID_TYPED_FROM_ASN1( TYPE_T, NAME, LIST ) \ static const TYPE_T * oid_ ## NAME ## _from_asn1( const asn1_buf *oid ) \ { \ const TYPE_T *p = LIST; \ const oid_descriptor_t *cur = (const oid_descriptor_t *) p; \ if( p == NULL || oid == NULL ) return( NULL ); \ while( cur->asn1 != NULL ) { \ if( cur->asn1_len == oid->len && \ memcmp( cur->asn1, oid->p, oid->len ) == 0 ) { \ return( p ); \ } \ p++; \ cur = (const oid_descriptor_t *) p; \ } \ return( NULL ); \ } /* * Macro to generate a function for retrieving a single attribute from the * descriptor of an oid_descriptor_t wrapper. */ #define FN_OID_GET_DESCRIPTOR_ATTR1(FN_NAME, TYPE_T, TYPE_NAME, ATTR1_TYPE, ATTR1) \ int FN_NAME( const asn1_buf *oid, ATTR1_TYPE * ATTR1 ) \ { \ const TYPE_T *data = oid_ ## TYPE_NAME ## _from_asn1( oid ); \ if( data == NULL ) return( POLARSSL_ERR_OID_NOT_FOUND ); \ *ATTR1 = data->descriptor.ATTR1; \ return( 0 ); \ } /* * Macro to generate a function for retrieving a single attribute from an * oid_descriptor_t wrapper. */ #define FN_OID_GET_ATTR1(FN_NAME, TYPE_T, TYPE_NAME, ATTR1_TYPE, ATTR1) \ int FN_NAME( const asn1_buf *oid, ATTR1_TYPE * ATTR1 ) \ { \ const TYPE_T *data = oid_ ## TYPE_NAME ## _from_asn1( oid ); \ if( data == NULL ) return( POLARSSL_ERR_OID_NOT_FOUND ); \ *ATTR1 = data->ATTR1; \ return( 0 ); \ } /* * Macro to generate a function for retrieving two attributes from an * oid_descriptor_t wrapper. */ #define FN_OID_GET_ATTR2(FN_NAME, TYPE_T, TYPE_NAME, ATTR1_TYPE, ATTR1, \ ATTR2_TYPE, ATTR2) \ int FN_NAME( const asn1_buf *oid, ATTR1_TYPE * ATTR1, ATTR2_TYPE * ATTR2 ) \ { \ const TYPE_T *data = oid_ ## TYPE_NAME ## _from_asn1( oid ); \ if( data == NULL ) return( POLARSSL_ERR_OID_NOT_FOUND ); \ *ATTR1 = data->ATTR1; \ *ATTR2 = data->ATTR2; \ return( 0 ); \ } /* * Macro to generate a function for retrieving the OID based on a single * attribute from a oid_descriptor_t wrapper. */ #define FN_OID_GET_OID_BY_ATTR1(FN_NAME, TYPE_T, LIST, ATTR1_TYPE, ATTR1) \ int FN_NAME( ATTR1_TYPE ATTR1, const char **oid, size_t *olen ) \ { \ const TYPE_T *cur = LIST; \ while( cur->descriptor.asn1 != NULL ) { \ if( cur->ATTR1 == ATTR1 ) { \ *oid = cur->descriptor.asn1; \ *olen = cur->descriptor.asn1_len; \ return( 0 ); \ } \ cur++; \ } \ return( POLARSSL_ERR_OID_NOT_FOUND ); \ } /* * Macro to generate a function for retrieving the OID based on two * attributes from a oid_descriptor_t wrapper. */ #define FN_OID_GET_OID_BY_ATTR2(FN_NAME, TYPE_T, LIST, ATTR1_TYPE, ATTR1, \ ATTR2_TYPE, ATTR2) \ int FN_NAME( ATTR1_TYPE ATTR1, ATTR2_TYPE ATTR2, const char **oid , \ size_t *olen ) \ { \ const TYPE_T *cur = LIST; \ while( cur->descriptor.asn1 != NULL ) { \ if( cur->ATTR1 == ATTR1 && cur->ATTR2 == ATTR2 ) { \ *oid = cur->descriptor.asn1; \ *olen = cur->descriptor.asn1_len; \ return( 0 ); \ } \ cur++; \ } \ return( POLARSSL_ERR_OID_NOT_FOUND ); \ } /* * For X520 attribute types */ typedef struct { oid_descriptor_t descriptor; const char *short_name; } oid_x520_attr_t; static const oid_x520_attr_t oid_x520_attr_type[] = { { { ADD_LEN( OID_AT_CN ), "id-at-commonName", "Common Name" }, "CN", }, { { ADD_LEN( OID_AT_COUNTRY ), "id-at-countryName", "Country" }, "C", }, { { ADD_LEN( OID_AT_LOCALITY ), "id-at-locality", "Locality" }, "L", }, { { ADD_LEN( OID_AT_STATE ), "id-at-state", "State" }, "ST", }, { { ADD_LEN( OID_AT_ORGANIZATION ),"id-at-organizationName", "Organization" }, "O", }, { { ADD_LEN( OID_AT_ORG_UNIT ), "id-at-organizationalUnitName", "Org Unit" }, "OU", }, { { ADD_LEN( OID_PKCS9_EMAIL ), "emailAddress", "E-mail address" }, "emailAddress", }, { { ADD_LEN( OID_AT_SERIAL_NUMBER ),"id-at-serialNumber", "Serial number" }, "serialNumber", }, { { ADD_LEN( OID_AT_POSTAL_ADDRESS ),"id-at-postalAddress", "Postal address" }, "postalAddress", }, { { ADD_LEN( OID_AT_POSTAL_CODE ), "id-at-postalCode", "Postal code" }, "postalCode", }, { { ADD_LEN( OID_AT_SUR_NAME ), "id-at-surName", "Surname" }, "SN", }, { { ADD_LEN( OID_AT_GIVEN_NAME ), "id-at-givenName", "Given name" }, "GN", }, { { ADD_LEN( OID_AT_INITIALS ), "id-at-initials", "Initials" }, "initials", }, { { ADD_LEN( OID_AT_GENERATION_QUALIFIER ), "id-at-generationQualifier", "Generation qualifier" }, "generationQualifier", }, { { ADD_LEN( OID_AT_TITLE ), "id-at-title", "Title" }, "title", }, { { ADD_LEN( OID_AT_DN_QUALIFIER ),"id-at-dnQualifier", "Distinguished Name qualifier" }, "dnQualifier", }, { { ADD_LEN( OID_AT_PSEUDONYM ), "id-at-pseudonym", "Pseudonym" }, "pseudonym", }, { { ADD_LEN( OID_DOMAIN_COMPONENT ), "id-domainComponent", "Domain component" }, "DC", }, { { NULL, 0, NULL, NULL }, NULL, } }; FN_OID_TYPED_FROM_ASN1(oid_x520_attr_t, x520_attr, oid_x520_attr_type); FN_OID_GET_ATTR1(oid_get_attr_short_name, oid_x520_attr_t, x520_attr, const char *, short_name); #if defined(POLARSSL_X509_USE_C) || defined(POLARSSL_X509_CREATE_C) /* * For X509 extensions */ typedef struct { oid_descriptor_t descriptor; int ext_type; } oid_x509_ext_t; static const oid_x509_ext_t oid_x509_ext[] = { { { ADD_LEN( OID_BASIC_CONSTRAINTS ), "id-ce-basicConstraints", "Basic Constraints" }, EXT_BASIC_CONSTRAINTS, }, { { ADD_LEN( OID_KEY_USAGE ), "id-ce-keyUsage", "Key Usage" }, EXT_KEY_USAGE, }, { { ADD_LEN( OID_EXTENDED_KEY_USAGE ), "id-ce-keyUsage", "Extended Key Usage" }, EXT_EXTENDED_KEY_USAGE, }, { { ADD_LEN( OID_SUBJECT_ALT_NAME ), "id-ce-subjectAltName", "Subject Alt Name" }, EXT_SUBJECT_ALT_NAME, }, { { ADD_LEN( OID_NS_CERT_TYPE ), "id-netscape-certtype", "Netscape Certificate Type" }, EXT_NS_CERT_TYPE, }, { { NULL, 0, NULL, NULL }, 0, }, }; FN_OID_TYPED_FROM_ASN1(oid_x509_ext_t, x509_ext, oid_x509_ext); FN_OID_GET_ATTR1(oid_get_x509_ext_type, oid_x509_ext_t, x509_ext, int, ext_type); static const oid_descriptor_t oid_ext_key_usage[] = { { ADD_LEN( OID_SERVER_AUTH ), "id-kp-serverAuth", "TLS Web Server Authentication" }, { ADD_LEN( OID_CLIENT_AUTH ), "id-kp-clientAuth", "TLS Web Client Authentication" }, { ADD_LEN( OID_CODE_SIGNING ), "id-kp-codeSigning", "Code Signing" }, { ADD_LEN( OID_EMAIL_PROTECTION ), "id-kp-emailProtection", "E-mail Protection" }, { ADD_LEN( OID_TIME_STAMPING ), "id-kp-timeStamping", "Time Stamping" }, { ADD_LEN( OID_OCSP_SIGNING ), "id-kp-OCSPSigning", "OCSP Signing" }, { NULL, 0, NULL, NULL }, }; FN_OID_TYPED_FROM_ASN1(oid_descriptor_t, ext_key_usage, oid_ext_key_usage); FN_OID_GET_ATTR1(oid_get_extended_key_usage, oid_descriptor_t, ext_key_usage, const char *, description); #endif /* POLARSSL_X509_USE_C || POLARSSL_X509_CREATE_C */ #if defined(POLARSSL_MD_C) /* * For SignatureAlgorithmIdentifier */ typedef struct { oid_descriptor_t descriptor; md_type_t md_alg; pk_type_t pk_alg; } oid_sig_alg_t; static const oid_sig_alg_t oid_sig_alg[] = { { { ADD_LEN( OID_PKCS1_MD2 ), "md2WithRSAEncryption", "RSA with MD2" }, POLARSSL_MD_MD2, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_PKCS1_MD4 ), "md4WithRSAEncryption", "RSA with MD4" }, POLARSSL_MD_MD4, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_PKCS1_MD5 ), "md5WithRSAEncryption", "RSA with MD5" }, POLARSSL_MD_MD5, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_PKCS1_SHA1 ), "sha-1WithRSAEncryption", "RSA with SHA1" }, POLARSSL_MD_SHA1, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_PKCS1_SHA224 ), "sha224WithRSAEncryption", "RSA with SHA-224" }, POLARSSL_MD_SHA224, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_PKCS1_SHA256 ), "sha256WithRSAEncryption", "RSA with SHA-256" }, POLARSSL_MD_SHA256, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_PKCS1_SHA384 ), "sha384WithRSAEncryption", "RSA with SHA-384" }, POLARSSL_MD_SHA384, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_PKCS1_SHA512 ), "sha512WithRSAEncryption", "RSA with SHA-512" }, POLARSSL_MD_SHA512, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_RSA_SHA_OBS ), "sha-1WithRSAEncryption", "RSA with SHA1" }, POLARSSL_MD_SHA1, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_ECDSA_SHA1 ), "ecdsa-with-SHA1", "ECDSA with SHA1" }, POLARSSL_MD_SHA1, POLARSSL_PK_ECDSA, }, { { ADD_LEN( OID_ECDSA_SHA224 ), "ecdsa-with-SHA224", "ECDSA with SHA224" }, POLARSSL_MD_SHA224, POLARSSL_PK_ECDSA, }, { { ADD_LEN( OID_ECDSA_SHA256 ), "ecdsa-with-SHA256", "ECDSA with SHA256" }, POLARSSL_MD_SHA256, POLARSSL_PK_ECDSA, }, { { ADD_LEN( OID_ECDSA_SHA384 ), "ecdsa-with-SHA384", "ECDSA with SHA384" }, POLARSSL_MD_SHA384, POLARSSL_PK_ECDSA, }, { { ADD_LEN( OID_ECDSA_SHA512 ), "ecdsa-with-SHA512", "ECDSA with SHA512" }, POLARSSL_MD_SHA512, POLARSSL_PK_ECDSA, }, { { ADD_LEN( OID_RSASSA_PSS ), "RSASSA-PSS", "RSASSA-PSS" }, POLARSSL_MD_NONE, POLARSSL_PK_RSASSA_PSS, }, { { NULL, 0, NULL, NULL }, POLARSSL_MD_NONE, POLARSSL_PK_NONE, }, }; FN_OID_TYPED_FROM_ASN1(oid_sig_alg_t, sig_alg, oid_sig_alg); FN_OID_GET_DESCRIPTOR_ATTR1(oid_get_sig_alg_desc, oid_sig_alg_t, sig_alg, const char *, description); FN_OID_GET_ATTR2(oid_get_sig_alg, oid_sig_alg_t, sig_alg, md_type_t, md_alg, pk_type_t, pk_alg); FN_OID_GET_OID_BY_ATTR2(oid_get_oid_by_sig_alg, oid_sig_alg_t, oid_sig_alg, pk_type_t, pk_alg, md_type_t, md_alg); #endif /* POLARSSL_MD_C */ /* * For PublicKeyInfo (PKCS1, RFC 5480) */ typedef struct { oid_descriptor_t descriptor; pk_type_t pk_alg; } oid_pk_alg_t; static const oid_pk_alg_t oid_pk_alg[] = { { { ADD_LEN( OID_PKCS1_RSA ), "rsaEncryption", "RSA" }, POLARSSL_PK_RSA, }, { { ADD_LEN( OID_EC_ALG_UNRESTRICTED ), "id-ecPublicKey", "Generic EC key" }, POLARSSL_PK_ECKEY, }, { { ADD_LEN( OID_EC_ALG_ECDH ), "id-ecDH", "EC key for ECDH" }, POLARSSL_PK_ECKEY_DH, }, { { NULL, 0, NULL, NULL }, POLARSSL_PK_NONE, }, }; FN_OID_TYPED_FROM_ASN1(oid_pk_alg_t, pk_alg, oid_pk_alg); FN_OID_GET_ATTR1(oid_get_pk_alg, oid_pk_alg_t, pk_alg, pk_type_t, pk_alg); FN_OID_GET_OID_BY_ATTR1(oid_get_oid_by_pk_alg, oid_pk_alg_t, oid_pk_alg, pk_type_t, pk_alg); #if defined(POLARSSL_ECP_C) /* * For namedCurve (RFC 5480) */ typedef struct { oid_descriptor_t descriptor; ecp_group_id grp_id; } oid_ecp_grp_t; static const oid_ecp_grp_t oid_ecp_grp[] = { { { ADD_LEN( OID_EC_GRP_SECP192R1 ), "secp192r1", "secp192r1" }, POLARSSL_ECP_DP_SECP192R1, }, { { ADD_LEN( OID_EC_GRP_SECP224R1 ), "secp224r1", "secp224r1" }, POLARSSL_ECP_DP_SECP224R1, }, { { ADD_LEN( OID_EC_GRP_SECP256R1 ), "secp256r1", "secp256r1" }, POLARSSL_ECP_DP_SECP256R1, }, { { ADD_LEN( OID_EC_GRP_SECP384R1 ), "secp384r1", "secp384r1" }, POLARSSL_ECP_DP_SECP384R1, }, { { ADD_LEN( OID_EC_GRP_SECP521R1 ), "secp521r1", "secp521r1" }, POLARSSL_ECP_DP_SECP521R1, }, { { ADD_LEN( OID_EC_GRP_SECP192K1 ), "secp192k1", "secp192k1" }, POLARSSL_ECP_DP_SECP192K1, }, { { ADD_LEN( OID_EC_GRP_SECP224K1 ), "secp224k1", "secp224k1" }, POLARSSL_ECP_DP_SECP224K1, }, { { ADD_LEN( OID_EC_GRP_SECP256K1 ), "secp256k1", "secp256k1" }, POLARSSL_ECP_DP_SECP256K1, }, { { ADD_LEN( OID_EC_GRP_BP256R1 ), "brainpoolP256r1","brainpool256r1" }, POLARSSL_ECP_DP_BP256R1, }, { { ADD_LEN( OID_EC_GRP_BP384R1 ), "brainpoolP384r1","brainpool384r1" }, POLARSSL_ECP_DP_BP384R1, }, { { ADD_LEN( OID_EC_GRP_BP512R1 ), "brainpoolP512r1","brainpool512r1" }, POLARSSL_ECP_DP_BP512R1, }, { { NULL, 0, NULL, NULL }, POLARSSL_ECP_DP_NONE, }, }; FN_OID_TYPED_FROM_ASN1(oid_ecp_grp_t, grp_id, oid_ecp_grp); FN_OID_GET_ATTR1(oid_get_ec_grp, oid_ecp_grp_t, grp_id, ecp_group_id, grp_id); FN_OID_GET_OID_BY_ATTR1(oid_get_oid_by_ec_grp, oid_ecp_grp_t, oid_ecp_grp, ecp_group_id, grp_id); #endif /* POLARSSL_ECP_C */ #if defined(POLARSSL_CIPHER_C) /* * For PKCS#5 PBES2 encryption algorithm */ typedef struct { oid_descriptor_t descriptor; cipher_type_t cipher_alg; } oid_cipher_alg_t; static const oid_cipher_alg_t oid_cipher_alg[] = { { { ADD_LEN( OID_DES_CBC ), "desCBC", "DES-CBC" }, POLARSSL_CIPHER_DES_CBC, }, { { ADD_LEN( OID_DES_EDE3_CBC ), "des-ede3-cbc", "DES-EDE3-CBC" }, POLARSSL_CIPHER_DES_EDE3_CBC, }, { { NULL, 0, NULL, NULL }, POLARSSL_CIPHER_NONE, }, }; FN_OID_TYPED_FROM_ASN1(oid_cipher_alg_t, cipher_alg, oid_cipher_alg); FN_OID_GET_ATTR1(oid_get_cipher_alg, oid_cipher_alg_t, cipher_alg, cipher_type_t, cipher_alg); #endif /* POLARSSL_CIPHER_C */ #if defined(POLARSSL_MD_C) /* * For digestAlgorithm */ typedef struct { oid_descriptor_t descriptor; md_type_t md_alg; } oid_md_alg_t; static const oid_md_alg_t oid_md_alg[] = { { { ADD_LEN( OID_DIGEST_ALG_MD2 ), "id-md2", "MD2" }, POLARSSL_MD_MD2, }, { { ADD_LEN( OID_DIGEST_ALG_MD4 ), "id-md4", "MD4" }, POLARSSL_MD_MD4, }, { { ADD_LEN( OID_DIGEST_ALG_MD5 ), "id-md5", "MD5" }, POLARSSL_MD_MD5, }, { { ADD_LEN( OID_DIGEST_ALG_SHA1 ), "id-sha1", "SHA-1" }, POLARSSL_MD_SHA1, }, { { ADD_LEN( OID_DIGEST_ALG_SHA224 ), "id-sha224", "SHA-224" }, POLARSSL_MD_SHA224, }, { { ADD_LEN( OID_DIGEST_ALG_SHA256 ), "id-sha256", "SHA-256" }, POLARSSL_MD_SHA256, }, { { ADD_LEN( OID_DIGEST_ALG_SHA384 ), "id-sha384", "SHA-384" }, POLARSSL_MD_SHA384, }, { { ADD_LEN( OID_DIGEST_ALG_SHA512 ), "id-sha512", "SHA-512" }, POLARSSL_MD_SHA512, }, { { NULL, 0, NULL, NULL }, POLARSSL_MD_NONE, }, }; FN_OID_TYPED_FROM_ASN1(oid_md_alg_t, md_alg, oid_md_alg); FN_OID_GET_ATTR1(oid_get_md_alg, oid_md_alg_t, md_alg, md_type_t, md_alg); FN_OID_GET_OID_BY_ATTR1(oid_get_oid_by_md, oid_md_alg_t, oid_md_alg, md_type_t, md_alg); #endif /* POLARSSL_MD_C */ #if defined(POLARSSL_PKCS12_C) /* * For PKCS#12 PBEs */ typedef struct { oid_descriptor_t descriptor; md_type_t md_alg; cipher_type_t cipher_alg; } oid_pkcs12_pbe_alg_t; static const oid_pkcs12_pbe_alg_t oid_pkcs12_pbe_alg[] = { { { ADD_LEN( OID_PKCS12_PBE_SHA1_DES3_EDE_CBC ), "pbeWithSHAAnd3-KeyTripleDES-CBC", "PBE with SHA1 and 3-Key 3DES" }, POLARSSL_MD_SHA1, POLARSSL_CIPHER_DES_EDE3_CBC, }, { { ADD_LEN( OID_PKCS12_PBE_SHA1_DES2_EDE_CBC ), "pbeWithSHAAnd2-KeyTripleDES-CBC", "PBE with SHA1 and 2-Key 3DES" }, POLARSSL_MD_SHA1, POLARSSL_CIPHER_DES_EDE_CBC, }, { { NULL, 0, NULL, NULL }, POLARSSL_MD_NONE, POLARSSL_CIPHER_NONE, }, }; FN_OID_TYPED_FROM_ASN1(oid_pkcs12_pbe_alg_t, pkcs12_pbe_alg, oid_pkcs12_pbe_alg); FN_OID_GET_ATTR2(oid_get_pkcs12_pbe_alg, oid_pkcs12_pbe_alg_t, pkcs12_pbe_alg, md_type_t, md_alg, cipher_type_t, cipher_alg); #endif /* POLARSSL_PKCS12_C */ #if defined(_MSC_VER) && !defined snprintf && !defined(EFIX64) && \ !defined(EFI32) #include #if !defined vsnprintf #define vsnprintf _vsnprintf #endif // vsnprintf /* * Windows _snprintf and _vsnprintf are not compatible to linux versions. * Result value is not size of buffer needed, but -1 if no fit is possible. * * This fuction tries to 'fix' this by at least suggesting enlarging the * size by 20. */ static int compat_snprintf( char *str, size_t size, const char *format, ... ) { va_list ap; int res = -1; va_start( ap, format ); res = vsnprintf( str, size, format, ap ); va_end( ap ); // No quick fix possible if( res < 0 ) return( (int) size + 20 ); return( res ); } #define snprintf compat_snprintf #endif /* _MSC_VER && !snprintf && !EFIX64 && !EFI32 */ #define SAFE_SNPRINTF() \ { \ if( ret == -1 ) \ return( POLARSSL_ERR_OID_BUF_TOO_SMALL ); \ \ if( (unsigned int) ret >= n ) { \ p[n - 1] = '\0'; \ return( POLARSSL_ERR_OID_BUF_TOO_SMALL ); \ } \ \ n -= (unsigned int) ret; \ p += (unsigned int) ret; \ } /* Return the x.y.z.... style numeric string for the given OID */ int oid_get_numeric_string( char *buf, size_t size, const asn1_buf *oid ) { int ret; size_t i, n; unsigned int value; char *p; p = buf; n = size; /* First byte contains first two dots */ if( oid->len > 0 ) { ret = polarssl_snprintf( p, n, "%d.%d", oid->p[0] / 40, oid->p[0] % 40 ); SAFE_SNPRINTF(); } value = 0; for( i = 1; i < oid->len; i++ ) { /* Prevent overflow in value. */ if( ( ( value << 7 ) >> 7 ) != value ) return( POLARSSL_ERR_OID_BUF_TOO_SMALL ); value <<= 7; value += oid->p[i] & 0x7F; if( !( oid->p[i] & 0x80 ) ) { /* Last byte */ ret = polarssl_snprintf( p, n, ".%d", value ); SAFE_SNPRINTF(); value = 0; } } return( (int) ( size - n ) ); } #endif /* POLARSSL_OID_C */