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Add verifying raw signature #353

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20 changes: 20 additions & 0 deletions src/rsasign-1.2.js
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Original file line number Diff line number Diff line change
Expand Up @@ -221,6 +221,26 @@ function _rsasign_getAlgNameAndHashFromHexDisgestInfo(hDigestInfo) {
return [];
}

/**
* verifies a raw RSA sigature for a message string with RSA public key.<br/>
* @name verifyRawWithMessageHex
* @memberOf RSAKey#
* @function
* @param {String} sMsgHex hexadecimal string of message to be verified.
* @param {String} hSig hexadecimal string of raw siganture.<br/>
* non-hexadecimal charactors including new lines will be ignored.
* @return returns 1 if valid, otherwise 0
*/
RSAKey.prototype.verifyRawWithMessageHex = function(sMsgHex, hSig) {
hSig = hSig.replace(_RE_HEXDECONLY, '');
hSig = hSig.replace(/[ \n]+/g, "");
var biSig = parseBigInt(hSig, 16);
if (biSig.bitLength() > this.n.bitLength()) return 0;
var biDecryptedSig = this.doPublic(biSig);
var hMsgHex = biDecryptedSig.toString(16).replace(/^1f+00/, '');
return (hMsgHex == sMsgHex);
};

/**
* verifies a sigature for a message string with RSA public key.<br/>
* @name verify
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