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    <p>I'm not really a node.js dev, so this is super hacky.. Here's a function that should output a RSA public key PEM from Base64 modulus and exponent. I'm going based on Trevor's comment about node.js <code>verify</code> expecting a PEM.</p> <p>This function composes a ASN.1 DER structure in hex, then hex-decodes it, then base64-encodes it, and then sandwiches it between <code>-----BEGIN PRIVATE KEY-----</code> and <code>-----END PRIVATE KEY-----</code>. After all, that's all a PEM is.</p> <pre><code>function rsaPublicKeyPem(modulus_b64, exponent_b64) { function prepadSigned(hexStr) { msb = hexStr[0] if ( (msb&gt;='8' &amp;&amp; msb&lt;='9') || (msb&gt;='a' &amp;&amp; msb&lt;='f') || (msb&gt;='A'&amp;&amp;msb&lt;='F')) { return '00'+hexStr; } else { return hexStr; } } function toHex(number) { var nstr = number.toString(16) if (nstr.length%2==0) return nstr return '0'+nstr } // encode ASN.1 DER length field // if &lt;=127, short form // if &gt;=128, long form function encodeLengthHex(n) { if (n&lt;=127) return toHex(n) else { n_hex = toHex(n) length_of_length_byte = 128 + n_hex.length/2 // 0x80+numbytes return toHex(length_of_length_byte)+n_hex } } var modulus = new Buffer(modulus_b64,'base64'); var exponent = new Buffer(exponent_b64, 'base64'); var modulus_hex = modulus.toString('hex') var exponent_hex = exponent.toString('hex') modulus_hex = prepadSigned(modulus_hex) exponent_hex = prepadSigned(exponent_hex) var modlen = modulus_hex.length/2 var explen = exponent_hex.length/2 var encoded_modlen = encodeLengthHex(modlen) var encoded_explen = encodeLengthHex(explen) var encoded_pubkey = '30' + encodeLengthHex( modlen + explen + encoded_modlen.length/2 + encoded_explen.length/2 + 2 ) + '02' + encoded_modlen + modulus_hex + '02' + encoded_explen + exponent_hex; var seq2 = '30 0d ' + '06 09 2a 86 48 86 f7 0d 01 01 01' + '05 00 ' + '03' + encodeLengthHex(encoded_pubkey.length/2 + 1) + '00' + encoded_pubkey; seq2 = seq2.replace(/ /g,''); var der_hex = '30' + encodeLengthHex(seq2.length/2) + seq2; der_hex = der_hex.replace(/ /g, ''); var der = new Buffer(der_hex, 'hex'); var der_b64 = der.toString('base64'); var pem = '-----BEGIN PUBLIC KEY-----\n' + der_b64.match(/.{1,64}/g).join('\n') + '\n-----END PUBLIC KEY-----\n'; return pem } </code></pre> <p>Binary manipulation with hex strings? Yuck.. but hey it's a hack.</p>
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    1. CONot working for me. Not clear what is wrong of course, just that the verify still fails.
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    2. COSlight modification to get that code working properly. ```pem = '-----BEGIN PUBLIC KEY-----\n'; for (var i = 0; i < der_b64.length; i += 64) { var len = der_b64.length - i; if (len > 64) { len = 64; } pem += der_b64.substr(i, len) + "\n"; } pem += '-----END PUBLIC KEY-----\n' ```
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