class OpenSSL::HMAC
Public Class Methods
Returns the authentication code as a binary string. The digest
parameter must be an instance of OpenSSL::Digest.
Example¶ ↑
key = 'key' data = 'The quick brown fox jumps over the lazy dog' digest = OpenSSL::Digest.new('sha1') hmac = OpenSSL::HMAC.digest(digest, key, data) #=> "\xDE|\x9B\x85\xB8\xB7\x8A\xA6\xBC\x8Az6\xF7\n\x90p\x1C\x9D\xB4\xD9"
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_LENINT(key), (unsigned char *)RSTRING_PTR(data), RSTRING_LEN(data), NULL, &buf_len); return rb_str_new((const char *)buf, buf_len); }
Returns the authentication code as a hex-encoded string. The
digest
parameter must be an instance of OpenSSL::Digest.
Example¶ ↑
key = 'key' data = 'The quick brown fox jumps over the lazy dog' digest = OpenSSL::Digest.new('sha1') hmac = OpenSSL::HMAC.hexdigest(digest, key, data) #=> "de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9"
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_LENINT(key), (unsigned char *)RSTRING_PTR(data), RSTRING_LEN(data), NULL, &buf_len); if (string2hex(buf, buf_len, &hexbuf, NULL) != 2 * (int)buf_len) { ossl_raise(eHMACError, "Cannot convert buf to hexbuf"); } hexdigest = ossl_buf2str(hexbuf, 2 * buf_len); return hexdigest; }
Returns an instance of OpenSSL::HMAC set with the key and digest algorithm to be used. The instance represents the initial state of the message authentication code before any data has been processed. To process data with it, use the instance method update with your data as an argument.
Example¶ ↑
key = 'key' digest = OpenSSL::Digest.new('sha1') instance = OpenSSL::HMAC.new(key, digest) #=> f42bb0eeb018ebbd4597ae7213711ec60760843f instance.class #=> OpenSSL::HMAC
A note about comparisons¶ ↑
Two instances won't be equal when they're compared, even if they have the same value. Use to_s or hexdigest to return the authentication code that the instance represents. For example:
other_instance = OpenSSL::HMAC.new('key', OpenSSL::Digest.new('sha1')) #=> f42bb0eeb018ebbd4597ae7213711ec60760843f instance #=> f42bb0eeb018ebbd4597ae7213711ec60760843f instance == other_instance #=> false instance.to_s == other_instance.to_s #=> true
static VALUE ossl_hmac_initialize(VALUE self, VALUE key, VALUE digest) { HMAC_CTX *ctx; StringValue(key); GetHMAC(self, ctx); HMAC_Init(ctx, RSTRING_PTR(key), RSTRING_LENINT(key), GetDigestPtr(digest)); return self; }
Public Instance Methods
Returns the authentication code an instance represents as a binary string.
Example¶ ↑
instance = OpenSSL::HMAC.new('key', OpenSSL::Digest.new('sha1')) #=> f42bb0eeb018ebbd4597ae7213711ec60760843f instance.digest #=> "\xF4+\xB0\xEE\xB0\x18\xEB\xBDE\x97\xAEr\x13q\x1E\xC6\a`\x84?"
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; }
Returns the authentication code an instance represents as a hex-encoded string.
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 * (int)buf_len) { OPENSSL_free(buf); ossl_raise(eHMACError, "Memory alloc error"); } OPENSSL_free(buf); hexdigest = ossl_buf2str(hexbuf, 2 * buf_len); return hexdigest; }
Returns self
as it was when it was first initialized, with all
processed data cleared from it.
Example¶ ↑
data = "The quick brown fox jumps over the lazy dog" instance = OpenSSL::HMAC.new('key', OpenSSL::Digest.new('sha1')) #=> f42bb0eeb018ebbd4597ae7213711ec60760843f instance.update(data) #=> de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9 instance.reset #=> f42bb0eeb018ebbd4597ae7213711ec60760843f
static VALUE ossl_hmac_reset(VALUE self) { HMAC_CTX *ctx; GetHMAC(self, ctx); HMAC_Init(ctx, NULL, 0, NULL); return self; }
Returns self
updated with the message to be authenticated. Can
be called repeatedly with chunks of the message.
Example¶ ↑
first_chunk = 'The quick brown fox jumps ' second_chunk = 'over the lazy dog' instance.update(first_chunk) #=> 5b9a8038a65d571076d97fe783989e52278a492a instance.update(second_chunk) #=> de7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9
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; }