diff options
Diffstat (limited to 'trunk/ext/openssl/ossl_hmac.c')
| -rw-r--r-- | trunk/ext/openssl/ossl_hmac.c | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/trunk/ext/openssl/ossl_hmac.c b/trunk/ext/openssl/ossl_hmac.c new file mode 100644 index 0000000000..aa7644aa5c --- /dev/null +++ b/trunk/ext/openssl/ossl_hmac.c @@ -0,0 +1,270 @@ +/* + * $Id$ + * 'OpenSSL for Ruby' project + * Copyright (C) 2001-2002 Michal Rokos <m.rokos@sh.cvut.cz> + * All rights reserved. + */ +/* + * This program is licenced under the same licence as Ruby. + * (See the file 'LICENCE'.) + */ +#if !defined(OPENSSL_NO_HMAC) + +#include "ossl.h" + +#define MakeHMAC(obj, klass, ctx) \ + obj = Data_Make_Struct(klass, HMAC_CTX, 0, ossl_hmac_free, ctx) +#define GetHMAC(obj, ctx) do { \ + Data_Get_Struct(obj, HMAC_CTX, ctx); \ + if (!ctx) { \ + ossl_raise(rb_eRuntimeError, "HMAC wasn't initialized"); \ + } \ +} while (0) +#define SafeGetHMAC(obj, ctx) do { \ + OSSL_Check_Kind(obj, cHMAC); \ + GetHMAC(obj, ctx); \ +} while (0) + +/* + * Classes + */ +VALUE cHMAC; +VALUE eHMACError; + +/* + * Public + */ + +/* + * Private + */ +static void +ossl_hmac_free(HMAC_CTX *ctx) +{ + HMAC_CTX_cleanup(ctx); + ruby_xfree(ctx); +} + +static VALUE +ossl_hmac_alloc(VALUE klass) +{ + HMAC_CTX *ctx; + VALUE obj; + + MakeHMAC(obj, klass, ctx); + HMAC_CTX_init(ctx); + + return obj; +} + + +/* + * call-seq: + * HMAC.new(key, digest) -> hmac + * + */ +static VALUE +ossl_hmac_initialize(VALUE self, VALUE key, VALUE digest) +{ + HMAC_CTX *ctx; + + StringValue(key); + GetHMAC(self, ctx); + HMAC_Init_ex(ctx, RSTRING_PTR(key), RSTRING_LEN(key), + GetDigestPtr(digest), NULL); + + return self; +} + +static VALUE +ossl_hmac_copy(VALUE self, VALUE other) +{ + HMAC_CTX *ctx1, *ctx2; + + rb_check_frozen(self); + if (self == other) return self; + + GetHMAC(self, ctx1); + SafeGetHMAC(other, ctx2); + + HMAC_CTX_copy(ctx1, ctx2); + return self; +} + +/* + * call-seq: + * hmac.update(string) -> self + * + */ +static VALUE +ossl_hmac_update(VALUE self, VALUE data) +{ + HMAC_CTX *ctx; + + StringValue(data); + GetHMAC(self, ctx); + HMAC_Update(ctx, (unsigned char *)RSTRING_PTR(data), RSTRING_LEN(data)); + + return self; +} + +static void +hmac_final(HMAC_CTX *ctx, unsigned char **buf, unsigned int *buf_len) +{ + HMAC_CTX final; + + HMAC_CTX_copy(&final, ctx); + if (!(*buf = OPENSSL_malloc(HMAC_size(&final)))) { + HMAC_CTX_cleanup(&final); + OSSL_Debug("Allocating %d mem", HMAC_size(&final)); + ossl_raise(eHMACError, "Cannot allocate memory for hmac"); + } + HMAC_Final(&final, *buf, buf_len); + HMAC_CTX_cleanup(&final); +} + +/* + * call-seq: + * hmac.digest -> aString + * + */ +static VALUE +ossl_hmac_digest(VALUE self) +{ + HMAC_CTX *ctx; + unsigned char *buf; + unsigned int buf_len; + VALUE digest; + + GetHMAC(self, ctx); + hmac_final(ctx, &buf, &buf_len); + digest = ossl_buf2str((char *)buf, buf_len); + + return digest; +} + +/* + * call-seq: + * hmac.hexdigest -> aString + * + */ +static VALUE +ossl_hmac_hexdigest(VALUE self) +{ + HMAC_CTX *ctx; + unsigned char *buf; + char *hexbuf; + unsigned int buf_len; + VALUE hexdigest; + + GetHMAC(self, ctx); + hmac_final(ctx, &buf, &buf_len); + if (string2hex(buf, buf_len, &hexbuf, NULL) != 2 * buf_len) { + OPENSSL_free(buf); + ossl_raise(eHMACError, "Memory alloc error"); + } + OPENSSL_free(buf); + hexdigest = ossl_buf2str(hexbuf, 2 * buf_len); + + return hexdigest; +} + +/* + * call-seq: + * hmac.reset -> self + * + */ +static VALUE +ossl_hmac_reset(VALUE self) +{ + HMAC_CTX *ctx; + + GetHMAC(self, ctx); + HMAC_Init_ex(ctx, NULL, 0, NULL, NULL); + + return self; +} + +/* + * call-seq: + * HMAC.digest(digest, key, data) -> aString + * + */ +static VALUE +ossl_hmac_s_digest(VALUE klass, VALUE digest, VALUE key, VALUE data) +{ + unsigned char *buf; + unsigned int buf_len; + + StringValue(key); + StringValue(data); + buf = HMAC(GetDigestPtr(digest), RSTRING_PTR(key), RSTRING_LEN(key), + (unsigned char *)RSTRING_PTR(data), RSTRING_LEN(data), NULL, &buf_len); + + return rb_str_new((const char *)buf, buf_len); +} + +/* + * call-seq: + * HMAC.digest(digest, key, data) -> aString + * + */ +static VALUE +ossl_hmac_s_hexdigest(VALUE klass, VALUE digest, VALUE key, VALUE data) +{ + unsigned char *buf; + char *hexbuf; + unsigned int buf_len; + VALUE hexdigest; + + StringValue(key); + StringValue(data); + + buf = HMAC(GetDigestPtr(digest), RSTRING_PTR(key), RSTRING_LEN(key), + (unsigned char *)RSTRING_PTR(data), RSTRING_LEN(data), NULL, &buf_len); + if (string2hex(buf, buf_len, &hexbuf, NULL) != 2 * buf_len) { + ossl_raise(eHMACError, "Cannot convert buf to hexbuf"); + } + hexdigest = ossl_buf2str(hexbuf, 2 * buf_len); + + return hexdigest; +} + +/* + * INIT + */ +void +Init_ossl_hmac() +{ +#if 0 /* let rdoc know about mOSSL */ + mOSSL = rb_define_module("OpenSSL"); +#endif + + eHMACError = rb_define_class_under(mOSSL, "HMACError", eOSSLError); + + cHMAC = rb_define_class_under(mOSSL, "HMAC", rb_cObject); + + rb_define_alloc_func(cHMAC, ossl_hmac_alloc); + rb_define_singleton_method(cHMAC, "digest", ossl_hmac_s_digest, 3); + rb_define_singleton_method(cHMAC, "hexdigest", ossl_hmac_s_hexdigest, 3); + + rb_define_method(cHMAC, "initialize", ossl_hmac_initialize, 2); + rb_define_copy_func(cHMAC, ossl_hmac_copy); + + rb_define_method(cHMAC, "reset", ossl_hmac_reset, 0); + rb_define_method(cHMAC, "update", ossl_hmac_update, 1); + rb_define_alias(cHMAC, "<<", "update"); + rb_define_method(cHMAC, "digest", ossl_hmac_digest, 0); + rb_define_method(cHMAC, "hexdigest", ossl_hmac_hexdigest, 0); + rb_define_alias(cHMAC, "inspect", "hexdigest"); + rb_define_alias(cHMAC, "to_s", "hexdigest"); +} + +#else /* NO_HMAC */ +# warning >>> OpenSSL is compiled without HMAC support <<< +void +Init_ossl_hmac() +{ + rb_warning("HMAC will NOT be avaible: OpenSSL is compiled without HMAC."); +} +#endif /* NO_HMAC */ |