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    <p>To answer my own question, after posting on openssl mailing list got this:</p> <p>Here is C code to convert from an OpenSSL public key to an OpenSSH public key. You can grab the code from <a href="http://www.idrix.fr/Root/Samples/pubkey2ssh.c" rel="noreferrer">this link</a> and compile it yourself:</p> <pre><code>static unsigned char pSshHeader[11] = { 0x00, 0x00, 0x00, 0x07, 0x73, 0x73, 0x68, 0x2D, 0x72, 0x73, 0x61}; static int SshEncodeBuffer(unsigned char *pEncoding, int bufferLen, unsigned char* pBuffer) { int adjustedLen = bufferLen, index; if (*pBuffer &amp; 0x80) { adjustedLen++; pEncoding[4] = 0; index = 5; } else { index = 4; } pEncoding[0] = (unsigned char) (adjustedLen &gt;&gt; 24); pEncoding[1] = (unsigned char) (adjustedLen &gt;&gt; 16); pEncoding[2] = (unsigned char) (adjustedLen &gt;&gt; 8); pEncoding[3] = (unsigned char) (adjustedLen ); memcpy(&amp;pEncoding[index], pBuffer, bufferLen); return index + bufferLen; } int main(int argc, char** argv) { int iRet = 0; int nLen = 0, eLen = 0; int encodingLength = 0; int index = 0; unsigned char *nBytes = NULL, *eBytes = NULL; unsigned char* pEncoding = NULL; FILE* pFile = NULL; EVP_PKEY *pPubKey = NULL; RSA* pRsa = NULL; BIO *bio, *b64; ERR_load_crypto_strings(); OpenSSL_add_all_algorithms(); if (argc != 3) { printf("usage: %s public_key_file_name ssh_key_description\n", argv[0]); iRet = 1; goto error; } pFile = fopen(argv[1], "rt"); if (!pFile) { printf("Failed to open the given file\n"); iRet = 2; goto error; } pPubKey = PEM_read_PUBKEY(pFile, NULL, NULL, NULL); if (!pPubKey) { printf("Unable to decode public key from the given file: %s\n", ERR_error_string(ERR_get_error(), NULL)); iRet = 3; goto error; } if (EVP_PKEY_type(pPubKey-&gt;type) != EVP_PKEY_RSA) { printf("Only RSA public keys are currently supported\n"); iRet = 4; goto error; } pRsa = EVP_PKEY_get1_RSA(pPubKey); if (!pRsa) { printf("Failed to get RSA public key : %s\n", ERR_error_string(ERR_get_error(), NULL)); iRet = 5; goto error; } // reading the modulus nLen = BN_num_bytes(pRsa-&gt;n); nBytes = (unsigned char*) malloc(nLen); BN_bn2bin(pRsa-&gt;n, nBytes); // reading the public exponent eLen = BN_num_bytes(pRsa-&gt;e); eBytes = (unsigned char*) malloc(eLen); BN_bn2bin(pRsa-&gt;e, eBytes); encodingLength = 11 + 4 + eLen + 4 + nLen; // correct depending on the MSB of e and N if (eBytes[0] &amp; 0x80) encodingLength++; if (nBytes[0] &amp; 0x80) encodingLength++; pEncoding = (unsigned char*) malloc(encodingLength); memcpy(pEncoding, pSshHeader, 11); index = SshEncodeBuffer(&amp;pEncoding[11], eLen, eBytes); index = SshEncodeBuffer(&amp;pEncoding[11 + index], nLen, nBytes); b64 = BIO_new(BIO_f_base64()); BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); bio = BIO_new_fp(stdout, BIO_NOCLOSE); BIO_printf(bio, "ssh-rsa "); bio = BIO_push(b64, bio); BIO_write(bio, pEncoding, encodingLength); BIO_flush(bio); bio = BIO_pop(b64); BIO_printf(bio, " %s\n", argv[2]); BIO_flush(bio); BIO_free_all(bio); BIO_free(b64); error: if (pFile) fclose(pFile); if (pRsa) RSA_free(pRsa); if (pPubKey) EVP_PKEY_free(pPubKey); if (nBytes) free(nBytes); if (eBytes) free(eBytes); if (pEncoding) free(pEncoding); EVP_cleanup(); ERR_free_strings(); return iRet; } </code></pre>
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    1. POConvert pem key to ssh-rsa format
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    1. POConvert pem key to ssh-rsa format
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    1. COIn case someone is wondering how to compile this (I was), here's the compiler call: gcc -o pubkey2ssh pubkey2ssh.c -lcrypto
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    2. COwhere does on get argv[2] (ssh_key_description) from... I just have a -----BEGIN RSA PUBLIC KEY----- MIGJAoGBAMC62xWiOZYlhUhmk+JESy5eZunwGoG9kSHUMn67iBNZLEsR2qN44J1B TOtZRuEsSAKxu7alFlJVu5aSGbUvin3DusYAsl5sZjTf9VZgJHsVycOrtChC1tUi WMAWfv2BLTmK4zBEC33riEBLeX8Trphp3YbIMtzqV81ZrzHZbSnrAgMBAAE= -----END RSA PUBLIC KEY----- it doesn't have a description
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