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POOutput AES/ECB/PKCS7 in c and java is not same
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copied!<p>Hi i am using AES/ECB/PKCS7 mode for encryption, individually in c& java, encryption & decryption working fine. But in c encrypted data is not same as encrypted data in java... </p> <p>I am posting my code in C language and java. I need Encryption in c and Decryption in java. Please assist me c code for aes/ecb/pkcs7 is correct ??.. I am using openssl </p> <p>C code:</p> <pre class="lang-c prettyprint-override"><code>int Secure_encrypt(unsigned char *in, int inlen, unsigned char *out,int *outlen) { int tmplen; // Key is 256 and is fixed. unsigned char key[256] = { 0x21,0x0a,0x03,0x23,0x45,0x29,0x78,0x12,0x35,0x45,0x67,0x78,0x21,0x13, 0x34,0x56,0x67,0x45,0x12,0x89,0x38,0x0e,0xa0,0x15,0x21, 0x0a,0x03,0x23,0x45,0x0b,0x15,0x0c }; unsigned char *iv=0; EVP_CIPHER_CTX x; EVP_CIPHER_CTX_init(&x); EVP_CIPHER_CTX_set_padding(&x,1); // 1- padding, 0 - No Padding if (!EVP_EncryptInit_ex(&x, EVP_aes_256_ecb(), 0, key, iv)) { //printf("\n ERROR!! \n"); return -1; } if (!EVP_EncryptUpdate(&x, out, outlen,(const unsigned char*) in, inlen)) { //printf("\n ERROR!! \n"); return -2; } if (!EVP_EncryptFinal_ex(&x,out + *outlen,&tmplen)) { //printf("\n ERROR!! \n"); return -3; } *outlen += tmplen; #ifdef DEBUG printf ("AES encrypted data %d len\n", *outlen); print_data (out, *outlen); #endif EVP_CIPHER_CTX_cleanup(&x); return 0; } /*AES DECRYPTION */ AES Decryption int Secure_decrypt(unsigned char *in, int inlen, unsigned char *out,int *outlen) { int tmplen; unsigned char *iv=0; unsigned char key[256] //AES/ECB/PKCS7 Padding EVP_CIPHER_CTX x; EVP_CIPHER_CTX_init(&x); EVP_CIPHER_CTX_set_padding(&x,1); // 1- padding, 0 - No Padding if (!EVP_DecryptInit_ex(&x, EVP_aes_256_ecb(), 0, key, iv)) { //printf("\n ERROR!! \n"); return -1; } if (!EVP_DecryptUpdate(&x, out, outlen,(const unsigned char*) in, inlen)) { //printf("\n ERROR!! \n"); return -2; } if (!EVP_DecryptFinal_ex(&x,out + *outlen,&tmplen)) { //printf("\n ERROR!! \n"); return -3; } *outlen += tmplen; #ifdef DEBUG printf ("AES encrypted data %d len \n", *outlen); print_data (out, *outlen); #endif EVP_CIPHER_CTX_cleanup(&x); return 0; } </code></pre> <p>Java code:</p> <pre class="lang-java prettyprint-override"><code>import java.security.Security; import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; import org.apache.commons.codec.binary.Base64; import org.bouncycastle.jce.provider.BouncyCastleProvider; public class doThis { public static void main(String[] args) { Security.addProvider(new BouncyCastleProvider()); String strDataToEncrypt = "Testing Encryption"; byte[] byteDataToTransmit = strDataToEncrypt.getBytes(); //41 6E 6B 61 72 61 6F 20 49 74 74 61 64 69 //byte[] byteDataToTransmit = new byte [] { 0x41,0x6E,0x6B,0x61,0x72,0x61,0x6F,0x20,0x49,0x74,0x74,0x61,0x64,0x69 }; try { byte [] keyBytes= new byte [] {0x21,0x0a,0x03,0x23,0x45,0x29,0x78,0x12,0x35, 0x45,0x67,0x78,0x21,0x13,0x34, 0x56,0x67,0x45,0x12,0x9,0x38,0x0e,0x20, 0x15,0x21,0x0a,0x03,0x23,0x45,0x0b,0x15,0x0c }; byte[] encrypted= aesEncrypt(byteDataToTransmit,keyBytes); System.out.println("\n AES Encrypted Data is "+new String (encrypted)); byte [] byteDecrypt=aesDecrypt(bytestrEncrypt, keyBytes); System.out.println("\n AES Decrypted Data is"+byteDecrypt); // byte [] byteDecrypt=aesDecrypt(encrypted , keyBytes); //System.out.println("\n AES Decrypted Data is"+new String(byteDecrypt)); } catch(Exception exp) { System.out.println(" Exception caught " + exp); exp.printStackTrace(); } } public static byte[] aesEncrypt(byte[] original, byte[] key) { try { SecretKeySpec keySpec = null; Cipher cipher = null; { keySpec = new SecretKeySpec(key, "AES/ECB/PKCS7Padding"); cipher = Cipher.getInstance("AES/ECB/PKCS7Padding"); cipher.init(Cipher.ENCRYPT_MODE, keySpec); // encryption } return cipher.doFinal(original); } catch(Exception e) { // Logger.e(e.toString()); } return null; } public static byte[] aesDecrypt(byte[] encrypted, byte[] key) { try { SecretKeySpec keySpec = null; Cipher cipher = null; { keySpec = new SecretKeySpec(key, "AES/ECB/PKCS7Padding"); cipher = Cipher.getInstance("AES/ECB/PKCS7Padding"); cipher.init(Cipher.DECRYPT_MODE, keySpec); } System.out.println("In Decryprion \n"+ new String (encrypted)); return cipher.doFinal(encrypted); } catch(Exception e) { // Logger.e(e.toString()); } return null; } } </code></pre>

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