Constification.
[openssl.git] / crypto / pem / pem_lib.c
index 22793fa..5e41d85 100644 (file)
 #ifndef OPENSSL_NO_DES
 #include <openssl/des.h>
 #endif
+#ifndef OPENSSL_NO_ENGINE
+#include <openssl/engine.h>
+#endif
 
-const char *PEM_version="PEM" OPENSSL_VERSION_PTEXT;
+const char PEM_version[]="PEM" OPENSSL_VERSION_PTEXT;
 
 #define MIN_LENGTH     4
 
@@ -102,7 +105,7 @@ int PEM_def_callback(char *buf, int num, int w, void *key)
 
        for (;;)
                {
-               i=EVP_read_pw_string(buf,num,prompt,w);
+               i=EVP_read_pw_string_min(buf,MIN_LENGTH,num,prompt,w);
                if (i != 0)
                        {
                        PEMerr(PEM_F_PEM_DEF_CALLBACK,PEM_R_PROBLEMS_GETTING_PASSWORD);
@@ -197,13 +200,46 @@ static int check_pem(const char *nm, const char *name)
                slen = pem_check_suffix(nm, "PRIVATE KEY"); 
                if (slen > 0)
                        {
-                       ameth = EVP_PKEY_asn1_find_str(nm, slen);
+                       /* NB: ENGINE implementations wont contain
+                        * a deprecated old private key decode function
+                        * so don't look for them.
+                        */
+                       ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
                        if (ameth && ameth->old_priv_decode)
                                return 1;
                        }
                return 0;
                }
 
+       if(!strcmp(name,PEM_STRING_PARAMETERS))
+               {
+               int slen;
+               const EVP_PKEY_ASN1_METHOD *ameth;
+               slen = pem_check_suffix(nm, "PARAMETERS"); 
+               if (slen > 0)
+                       {
+                       ENGINE *e;
+                       ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
+                       if (ameth)
+                               {
+                               int r;
+                               if (ameth->param_decode)
+                                       r = 1;
+                               else
+                                       r = 0;
+#ifndef OPENSSL_NO_ENGINE
+                               if (e)
+                                       ENGINE_finish(e);
+#endif
+                               return r;
+                               }
+                       }
+               return 0;
+               }
+       /* If reading DH parameters handle X9.42 DH format too */
+       if(!strcmp(nm,PEM_STRING_DHXPARAMS) &&
+               !strcmp(name,PEM_STRING_DHPARAMS)) return 1;
+
        /* Permit older strings */
 
        if(!strcmp(nm,PEM_STRING_X509_OLD) &&
@@ -223,6 +259,17 @@ static int check_pem(const char *nm, const char *name)
        if(!strcmp(nm, PEM_STRING_X509) &&
                !strcmp(name, PEM_STRING_PKCS7)) return 1;
 
+       if(!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&
+               !strcmp(name, PEM_STRING_PKCS7)) return 1;
+
+#ifndef OPENSSL_NO_CMS
+       if(!strcmp(nm, PEM_STRING_X509) &&
+               !strcmp(name, PEM_STRING_CMS)) return 1;
+       /* Allow CMS to be read from PKCS#7 headers */
+       if(!strcmp(nm, PEM_STRING_PKCS7) &&
+               !strcmp(name, PEM_STRING_CMS)) return 1;
+#endif
+
        return 0;
 }
 
@@ -268,7 +315,7 @@ err:
 
 #ifndef OPENSSL_NO_FP_API
 int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
-                  char *x, const EVP_CIPHER *enc, unsigned char *kstr,
+                  void *x, const EVP_CIPHER *enc, unsigned char *kstr,
                   int klen, pem_password_cb *callback, void *u)
         {
         BIO *b;
@@ -287,7 +334,7 @@ int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
 #endif
 
 int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
-                      char *x, const EVP_CIPHER *enc, unsigned char *kstr,
+                      void *x, const EVP_CIPHER *enc, unsigned char *kstr,
                       int klen, pem_password_cb *callback, void *u)
        {
        EVP_CIPHER_CTX ctx;
@@ -350,7 +397,8 @@ int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
                        goto err;
                /* The 'iv' is used as the iv and as a salt.  It is
                 * NOT taken from the BytesToKey function */
-               EVP_BytesToKey(enc,EVP_md5(),iv,kstr,klen,1,key,NULL);
+               if (!EVP_BytesToKey(enc,EVP_md5(),iv,kstr,klen,1,key,NULL))
+                       goto err;
 
                if (kstr == (unsigned char *)buf) OPENSSL_cleanse(buf,PEM_BUFSIZE);
 
@@ -362,12 +410,15 @@ int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
                /* k=strlen(buf); */
 
                EVP_CIPHER_CTX_init(&ctx);
-               EVP_EncryptInit_ex(&ctx,enc,NULL,key,iv);
-               EVP_EncryptUpdate(&ctx,data,&j,data,i);
-               EVP_EncryptFinal_ex(&ctx,&(data[j]),&i);
+               ret = 1;
+               if (!EVP_EncryptInit_ex(&ctx,enc,NULL,key,iv)
+                       || !EVP_EncryptUpdate(&ctx,data,&j,data,i)
+                       || !EVP_EncryptFinal_ex(&ctx,&(data[j]),&i))
+                       ret = 0;
                EVP_CIPHER_CTX_cleanup(&ctx);
+               if (ret == 0)
+                       goto err;
                i+=j;
-               ret=1;
                }
        else
                {
@@ -415,14 +466,17 @@ int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
        ebcdic2ascii(buf, buf, klen);
 #endif
 
-       EVP_BytesToKey(cipher->cipher,EVP_md5(),&(cipher->iv[0]),
-               (unsigned char *)buf,klen,1,key,NULL);
+       if (!EVP_BytesToKey(cipher->cipher,EVP_md5(),&(cipher->iv[0]),
+               (unsigned char *)buf,klen,1,key,NULL))
+               return 0;
 
        j=(int)len;
        EVP_CIPHER_CTX_init(&ctx);
-       EVP_DecryptInit_ex(&ctx,cipher->cipher,NULL, key,&(cipher->iv[0]));
-       EVP_DecryptUpdate(&ctx,data,&i,data,j);
-       o=EVP_DecryptFinal_ex(&ctx,&(data[i]),&j);
+       o = EVP_DecryptInit_ex(&ctx,cipher->cipher,NULL, key,&(cipher->iv[0]));
+       if (o)
+               o = EVP_DecryptUpdate(&ctx,data,&i,data,j);
+       if (o)
+               o = EVP_DecryptFinal_ex(&ctx,&(data[i]),&j);
        EVP_CIPHER_CTX_cleanup(&ctx);
        OPENSSL_cleanse((char *)buf,sizeof(buf));
        OPENSSL_cleanse((char *)key,sizeof(key));
@@ -438,7 +492,6 @@ int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
 
 int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
        {
-       int o;
        const EVP_CIPHER *enc=NULL;
        char *p,c;
        char **header_pp = &header;
@@ -478,7 +531,6 @@ int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
                header++;
                }
        *header='\0';
-       o=OBJ_sn2nid(p);
        cipher->cipher=enc=EVP_get_cipherbyname(p);
        *header=c;
        header++;
@@ -524,8 +576,8 @@ static int load_iv(char **fromp, unsigned char *to, int num)
        }
 
 #ifndef OPENSSL_NO_FP_API
-int PEM_write(FILE *fp, char *name, char *header, unsigned char *data,
-            long len)
+int PEM_write(FILE *fp, const char *name, const char *header,
+             const unsigned char *data, long len)
         {
         BIO *b;
         int ret;
@@ -542,8 +594,8 @@ int PEM_write(FILE *fp, char *name, char *header, unsigned char *data,
         }
 #endif
 
-int PEM_write_bio(BIO *bp, const char *name, char *header, unsigned char *data,
-            long len)
+int PEM_write_bio(BIO *bp, const char *name, const char *header,
+                 const unsigned char *data, long len)
        {
        int nlen,n,i,j,outl;
        unsigned char *buf = NULL;
@@ -586,6 +638,7 @@ int PEM_write_bio(BIO *bp, const char *name, char *header, unsigned char *data,
                }
        EVP_EncodeFinal(&ctx,buf,&outl);
        if ((outl > 0) && (BIO_write(bp,(char *)buf,outl) != outl)) goto err;
+       OPENSSL_cleanse(buf, PEM_BUFSIZE*8);
        OPENSSL_free(buf);
        buf = NULL;
        if (    (BIO_write(bp,"-----END ",9) != 9) ||
@@ -594,8 +647,10 @@ int PEM_write_bio(BIO *bp, const char *name, char *header, unsigned char *data,
                goto err;
        return(i+outl);
 err:
-       if (buf)
+       if (buf) {
+               OPENSSL_cleanse(buf, PEM_BUFSIZE*8);
                OPENSSL_free(buf);
+       }
        PEMerr(PEM_F_PEM_WRITE_BIO,reason);
        return(0);
        }